In plain terms

The claim being assessed: The nuclear lamina globally regulates gene expression by tethering and silencing lamina-associated domains, rather than serving a primarily mechanical role.

Where the evidence stands: Γ — Plausible mechanism. There is a believable biological story and partial support, but the causal step has not been demonstrated.

What this mechanism does: This makes the process worse or keeps it going, but something else starts it.

Strongest evidence for it: Scope-matched aggregation is fixed to global SC4 and yields Γ. SC2 has mapped context-specific Ε support, while SC1 remains Β and direct enzyme-recruitment necessity SC3 remains Γ. Whole-lamin deletion can change thousands of genes yet still fail to establish direct global repression: changes can be bidirectional, follow mechanics/stress, or depend on other envelope tethers. This is not a judgment that lamins lack regulatory function.

What decisive evidence would look like

In plain terms, researchers would change the proposed cause, confirm it changed as intended, and measure a meaningful health outcome while checking other explanations. The result should be able to support or count against the claim.

Relative explanatory fit: Alternative ranked ahead

What this review means

Lamins help organize genomes and regulate genes in defined settings; peripheral contact is not a universal gene-off switch, and global lamina-driven enzymatic silencing remains unestablished.

Implications for health and treatment: Scope-matched aggregation is fixed to global SC4 and yields Γ. SC2 has mapped context-specific Ε support, while SC1 remains Β and direct enzyme-recruitment necessity SC3 remains Γ. Whole-lamin deletion can change thousands of genes yet still fail to establish direct global repression: changes can be bidirectional, follow mechanics/stress, or depend on other envelope tethers. This is not a judgment that lamins lack regulatory function.

Limits for individual care: 60 primary reports with 8 selected partial-body examinations; density, heterogeneous controls and incomplete access set the confidence, not correctness. The grade applies to the exact registered claim; stronger findings for narrower subclaims remain separate. No complete-paper audit or blinded calibration is claimed. This educational review does not establish an individual treatment recommendation.

Medical information notice: This review provides general health information, not medical advice. It cannot diagnose a condition or replace an individual discussion with a qualified clinician.

Source checking used bounded original primary abstract passages/status records and selected original partial-body passages. No complete-abstract or complete-paper audit, or independent scientific peer review, is claimed. Detailed access counts and limitations appear in the review.

A low grade is not an accusation. It means the causal work has not been done yet, which is the ordinary state of most actively studied mechanisms in biology.

At a glance

Sub-claims assessed separately

Figures

Explanatory figures summarizing this review. They carry no evidential weight of their own; where a figure and the review differ, the review governs.

Full assessment

From here the review is written for a technical reader: caps and thresholds, competing models, the independence basis, and the citation ledger.

Sources: 60 primary reports; claims: 65; verified: 65; unverified: 0. Verification is bounded attribution. Access: 8 partial-body and 52 bounded abstract/status examinations. Literature cutoff: 2026-10-09; source examination UTC date: 2026-10-12. No complete-paper audit or blinded calibration claimed.

Adversarial review: Generated by Sol 6.1; adversarially reviewed by Claude Opus 5.5 (Anthropic) on 2026-10-14. 4 corrections applied (see ADVERSARIAL REVIEW AND APPROVAL). Status: Approved as revised.

AT A GLANCE

Lamins help organize genomes and regulate genes in defined settings; peripheral contact is not a universal gene-off switch, and global lamina-driven enzymatic silencing remains unestablished.

Deciding experiment: Engineer an endogenous lamin allele that loses a specified silencer interaction while preserving filament mechanics, envelope integrity and redundant-tether localization. Compare it with a mechanical-defect allele and expression-matched rescue across predefined stem and differentiated states. Perform short-time-course native nascent RNA plus contact/speckle mapping, with cell-cycle, replication stress and viability controls. Re-tether the enzyme selectively at native affected loci to test whether repression is restored before downstream damage.

Belief versus evidence: Scope-matched aggregation is fixed to global SC4 and yields Γ. SC2 has mapped context-specific Ε support, while SC1 remains Β and direct enzyme-recruitment necessity SC3 remains Γ. Whole-lamin deletion can change thousands of genes yet still fail to establish direct global repression: changes can be bidirectional, follow mechanics/stress, or depend on other envelope tethers. This is not a judgment that lamins lack regulatory function.

Best-supported rival: Spatial partitioning and speckle-distance regulation. The 2026 LBR/LAP2 deconvolution (41735607) identifies redundant tethers, with additional B-lamin depletion not enhancing the defined phenotype and only minor RNA changes after 72 h detachment. The 2018 TKO/B1 rescue (30201095) directly demonstrates lamin-sensitive topology with matched cell-cycle profiles but no preferential derepression of detached LAD genes. Together they distinguish contextual architectural control from one global filament-dependent silencing route; neither paper alone proves speckle distance is the unique mediator.

COMPETING MECHANISTIC MODELS

Rank 1: Spatial partitioning and speckle-distance regulation (Ε). Lamina-related topology constrains access to activating compartments and supports context-dependent transcription. TKO/B1 topology rescue, heat-shock myosin/speckle effects and stem-lineage rescue support architecture-linked regulation. Precise speckle-distance mediation is not universally isolated; whole-lamin loss changes many functions and can reduce global transcription.

Rank 2: Redundant inner-membrane tether network (Ε). LBR, LAP2, PRR14 and LEM proteins provide cell-specific anchoring with lamin cooperation rather than one indispensable filament mechanism. Sequential LBR/A-type tethers, LBR/LAP2 double-loss/rescue and NET/LEM perturbations define redundancy and lineage effects. Stable anchoring loss may change marks and transcription secondarily; redundancy alone does not prove every gene effect comes from positioning.

Rank 3: Mechanotransduction and stress signaling (Ε). Nuclear/cytoskeletal mechanics and damage responses cause a subset of transcription changes after lamin loss. Strain, actin-MKL1 rescue, adult cardiac stress and human myotube load responses establish functional mechanosignaling contexts. Not all mechanoregulation requires lamin A/C, and native topology/lineage results cannot be reduced entirely to terminal mechanical failure.

Rank 4: Chromatin self-organization with peripheral adhesion (Ε). Heterochromatin compaction and self-association set much organization; envelope contacts provide a boundary condition. Worm methylation-versus-anchor mutants separate compaction and attachment with little RNA change; enzyme loss can also suppress peripheral euchromatic genes. Polymer models alone do not establish causality, and endogenous lamin/NET rescues retain a real architectural role.

Rank 5: Direct global lamina enzymatic repression (Γ). Lamina filaments recruit indispensable enzymatic silencers across LADs and cell states. Local Drosophila HDAC/lamin effects, SIRT7-L1 regulation and some ectopic tether repression form the strongest support. Selective recruitment necessity is not isolated; null stem-cell and short-detachment tests, enzyme/position decoupling and active peripheral transcription challenge the global claim.

The tournament does not alter the nominal level. Compatible pathways and flexible alternatives are not automatically proved by explaining observations.

FULL REVIEW

Registered claim and scope

The nuclear lamina globally regulates gene expression by tethering and silencing lamina-associated domains, rather than serving a primarily mechanical role.

Index scope-matched retained. The registered headline is global across cell states: SC4 is the full-scope comparison; narrow topological SC2 success is reported separately rather than replacing the global claim.

Selection: remaining-priority list position 18 from the editorial list of 2026-10-09. Registered claim assessed against original sources. Any carried-forward edition and prior visibility are recorded in the change record; no independent blinded calibration is claimed.

Evidence and causal interpretation

Rubric fit: 03-epigenetics-gene-regulation directly covers lamina-associated control. Native intact-cell endogenous loci/proteins with functional transcription and cell-state controls are assessed as field-valid cellular systems under its endogenous perturbation definitions; purified biochemistry, synthetic reporter behavior and polymer simulation are not elevated to native causal proof. Mechanical/survival/replication effects of whole lamin loss must be separated from direct silencer recruitment. The registered global SC4 gate is retained and narrow SC2 does not replace it.

LAD maps establish a descriptive low-expression compartment, but single-cell variability, intermediate peripheral domains and active in-LAD enhancers demonstrate heterogeneity. Neither peripheral proximity nor a low mean expression is a complete repression mechanism. PMID16878134;18463634;26365489;36691074;36833261;34023908.

Native lamin loss provides meaningful counterchecks. The 2011 original body shows lamin-null ESC growth/differentiation and no correlation between bound promoters and gene changes. The 2018 original body finds matched cell-cycle profiles and partial B1 rescue of topology, but no preferential upregulation of detached LAD genes. Thus architectural necessity and transcriptional repression cannot be collapsed. PMID22116031;25784758;30201095.

The 2024 genetic-screen original body retains the modest LMNB1 hit in only one LAD, essential/redundancy limitations and disappearance of apparent LAD preference under expression matching for NELF. The 2012 Drosophila body shows HDAC1 repression without contact loss and HDAC3 contact loss without the same repression, with partial redundant LEM contributions. These papers support local chromatin regulation but do not identify a globally necessary lamina-recruited enzyme route. PMID39322756;23226217;31226208.

The 2026 original tether-deconvolution body identifies LBR/LAP2 as major redundant anchors; additional B-lamin loss does not enhance the defined detachment phenotype. At 72 hours severe detachment affects few genes, while chronic knockout deregulates many and alters H3K27me3 with only weak expression correlation. Nuclear-network disruption can be functionally important without being immediate filament-driven silencing. PMID41735607;23374351;24209742;27264872.

Contextual causality remains substantial. The 2022 naive-stem/cardiac body demonstrates Gata4 genetic rescue, opposite transcriptional effects by developmental stage and failure of B1 loss to mimic A-type loss. Motor/heat-shock, mechanics and cardiac stress studies add alternate native causal paths. The 2025 human knockout/speckle study is a strong abstract-level lead but reduced global transcription and homeostasis require the full specificity controls before claiming SON-distance mediation. PMID36333314;31988151;14755334;23644458;38718107;41205174.

Synthetic peripheral assays disagree in an informative way: some constructs repress, whereas a 4 Mb array can recruit polymerase and transcribe at similar induction kinetics at the lamina. That array is not a native gene, and reporter relocation cannot by itself establish global endogenous necessity. Worm anchors/compaction also dissociate organization and RNA, and attachment contributes to nuclear deformability. Mechanics and regulation are intertwined functions rather than alternatives resolved by a LAD map. PMID18272965;18195101;30982597;26607792;32385148;40335054.

A new Consensus lead was verified as the 2026 peer-reviewed original B-lamin/speckle paper. Its actual Methods uses H1299 carcinoma CRISPR clones, not an acute degron. Original Results report more-than-half lower nascent RNA, a correlation between speckle proximity and expression, increased death/apoptosis and reduced proliferation; shRNA depletion reproduces apoptotic effects. This strengthens a context-specific speckle/architecture alternative, but mediator specificity against stress/global decline is still unresolved. PMID41909953.

HYPOTHESIS STATE EVALUATION FRAMEWORK (HSEF v5.3)

Subclaim matrix and aggregation

Preregistered aggregation: scope-matched. Scope-matched aggregation is fixed to global SC4 and yields Γ. SC2 has mapped context-specific Ε support, while SC1 remains Β and direct enzyme-recruitment necessity SC3 remains Γ. Whole-lamin deletion can change thousands of genes yet still fail to establish direct global repression: changes can be bidirectional, follow mechanics/stress, or depend on other envelope tethers. This is not a judgment that lamins lack regulatory function. Sensitivities: weakest-link Β; primary-subclaim Γ; scope-matched Γ.

Decisive-perturbation inventory and causal tally

[9] LAD reporter screens identify many chromatin regulators and few envelope hits; LMNB1 is modest in one LAD and null in another; native-gene CRISPRi tests NELF. Essential proteins and redundancy may be missed; matched-expression analysis reduces apparent LAD preference. Native NELF effect does not prove its recruitment by lamina.

[10] Drosophila lamin and HDAC knockdowns identify local chromatin/transcription effects; HDAC1 silences while HDAC3 contributes anchoring. HDAC1 acts beyond tightly bound genes and changes growth modestly; selective lamina-HDAC interaction loss/rescue is absent. Local support is not global enzyme necessity.

[12] Muscle-specific NET depletion/repositioning changes selected developmental-gene repression and myogenesis. NETs rather than lamin filaments are targeted; combined loss affects differentiation. Tissue-specific architecture does not establish a global lamin mechanism.

[15] B-lamin-null ESCs retain self-renewal and differentiation; expression changes do not correlate with lamin-bound promoters, while organogenesis requires lamins. Mouse ESC/TE contexts differ from tissues and chronic compensation is possible; lamin absence is not absence of all envelope tethers.

[16] Essentially all-lamin removal leaves genome-wide emerin-contact organization detectable in mouse ESCs. Emerin marks envelope contact, not every mesoscale interaction or functional output; redundancy and cell state remain.

[17] Lamin TKO changes selected LAD/topological interactions and B1 restoration partly reverses topology with matched cell-cycle profiles. Detached LAD genes are not preferentially upregulated; RNA changes correlate with altered interactions but selective topology-to-transcription mediation is incomplete. Re-expression also creates non-native interactions.

[23] Lmna loss alters naive stem-cell cardiac fate and architecture, with Gata4 reduction/allele rescue; effects reverse in progenitors/cardiomyocytes and differ from B1 loss. Mechanistic narrowing identifies a TF-mediated context, but no selective tethering-versus-mechanics allele proves global LAD enzymatic repression. Disease point mutations differ from null.

[27] LBR/LAP2 redundancy maintains peripheral heterochromatin; short-term detachment changes expression little, prolonged knockout changes expression/marks and cell fate. Additional B-lamin depletion does not enhance defined tether-loss phenotype; long-term stress/TF amplification and mixed direction prevent direct enzymatic causality at all LADs.

Tally: 3 positive qualifying study units across scoped subclaims; 49 screened discriminating contrast units. These are not independent causal lines or proof of full-claim necessity/sufficiency. Null and negative contrasts are discriminators, not positive threshold crossings. Reports and replications are not independent causal lines. Reports sharing participants, models or instruments are not independent causal lines. Pivotal nulls do not earn positive threshold crossings.

Cap audit, precedence and Β/Γ/Δ boundary

Intact-cell endogenous perturbations are judged under rubric 03, with specificity and functional native transcription required. Pure LAD mapping remains Β. Synthetic peripheral tethering and reporter integrations test their construct/promoter contexts and cannot establish global native necessity; biochemical interaction and polymer simulation remain partial support. Local positive lamin/HDAC perturbations are retained, but whole-enzyme loss is not selective proof of lamina recruitment. SC4 is limited by a missing positive selective full-scope test and actual contrary controls, not by wrongly applying a reporter-only cap to every endogenous experiment.

Universal six-cap audit: All six universal caps were considered: cell-only inference, unperturbed association, ectopic expression, biomarker-only intervention, forced transfer/seeding, and inherited-to-sporadic scope transfer. Each binds its offered inference; complementary same-scope causal classes are assessed together rather than re-capped in isolation.

Gamma hard-rule audit: Imaging, contact enrichment, histone co-occurrence and reporter behavior alone do not cross the native functional boundary. SC2 contains endogenous functional perturbations, topology rescue and actual context controls; not just FRAP or contact enrichment. SC3 lacks selective recruitment disruption/rescue even where the silencing enzyme itself matters. SC4 includes native contrary/null tests and global secondary effects; no isolated all-state direct repressive mechanism crosses its boundary.

SC1 cap: “Pure association evidence — however large, however replicated — cannot exceed Β.” LAD genes have lower average expression across organism and cell-state maps, with active escapers and dynamic intermediate peripheral domains. This descriptive existence claim remains Β; lamina contact does not itself identify a causal silencer.

SC1 field-valid definition: “ - Endogenous degron of a condensate component with matched rescue, AND evidence that the specific condensate state (not generic protein loss) drives the phenotype - Locus-specific disruption of looping with locus-specific effect - Combinatorial histone-mark perturbation showing direct output dependence - Critically: specificity against cell-cycle collapse, global transcriptional collapse, and replication stress must be demonstrated” Positive full-scope result: no. LAD genes have lower average expression across organism and cell-state maps, with active escapers and dynamic intermediate peripheral domains. This descriptive existence claim remains Β; lamina contact does not itself identify a causal silencer.

SC2 field-valid definition: “ - Endogenous degron of a condensate component with matched rescue, AND evidence that the specific condensate state (not generic protein loss) drives the phenotype - Locus-specific disruption of looping with locus-specific effect - Combinatorial histone-mark perturbation showing direct output dependence - Critically: specificity against cell-cycle collapse, global transcriptional collapse, and replication stress must be demonstrated” Positive full-scope result: yes. Endogenous lamin loss/restoration changes topology and functional gene regulation in defined contexts. Matched cell-cycle TKO/B1-rescue experiments, specific Drosophila loci, heat-shock responses and Gata4-dependent lineage rescue support a genuine contribution, with stem-state, isoform and mechanical boundaries. Whole-protein loss does not isolate every topology/speckle mediator.

SC3 field-valid definition: “ - Endogenous degron of a condensate component with matched rescue, AND evidence that the specific condensate state (not generic protein loss) drives the phenotype - Locus-specific disruption of looping with locus-specific effect - Combinatorial histone-mark perturbation showing direct output dependence - Critically: specificity against cell-cycle collapse, global transcriptional collapse, and replication stress must be demonstrated” Positive full-scope result: no. Local HDAC/SIRT7 and lamin-dependent effects provide mechanistic support, but enzyme activity required for repression is not the same as necessity of recruitment by lamin. HDAC1 silencing can change without detachment, HDAC3 detachment can change without silencing, and native/reporter screens implicate chromatin regulators with weak/variable NL dependence. Selective recruitment-defective loss/rescue at native LADs remains unverified.

SC4 field-valid definition: “ - Endogenous degron of a condensate component with matched rescue, AND evidence that the specific condensate state (not generic protein loss) drives the phenotype - Locus-specific disruption of looping with locus-specific effect - Combinatorial histone-mark perturbation showing direct output dependence - Critically: specificity against cell-cycle collapse, global transcriptional collapse, and replication stress must be demonstrated” Positive full-scope result: no. The global direct-tethering/silencing claim is not supported by lamina association alone and is challenged by lamin-null stem-cell competence, lack of preferential LAD derepression, transcriptionally competent peripheral loci and short-term detachment with minor expression effects. Contextual gene regulation is real; constitutive all-state enzymatic repression rather than mechanics/network effects has not been isolated.

Upward threshold ladder

SC1 Δ: “Requires at least one endogenous perturbation showing the proposed feature contributes causally to the claimed output.” Satisfied: no. Use endogenous contact/tether manipulation with native transcription, matched local chromatin and cell-cycle controls before assigning a mechanistic direction to LAD maps.

SC2 Δ: “Requires at least one endogenous perturbation showing the proposed feature contributes causally to the claimed output.” Satisfied: yes.

SC2 Ε: “Requires context-specific causality with clear scope restriction. Many enhancer, condensate, or accessibility claims belong here.” Satisfied: yes.

SC2 Ζ: “Requires: - Independent causal tests across loci or systems - Specificity beyond global transcriptional collapse - Narrowing of key alternatives” Satisfied: no. Combine rapid endogenous depletion with expression-matched topology-versus-mechanics separation alleles and mediator rescue; reproduce native transcription effects across predefined cell states without global collapse.

SC3 Δ: “Requires at least one endogenous perturbation showing the proposed feature contributes causally to the claimed output.” Satisfied: no. Disrupt only the endogenous lamin-silencer interaction while preserving lamina structure, enzyme levels and catalytic competence; prove recruitment loss changes native LAD transcription and recruitment-specific rescue restores repression.

SC4 Δ: “Requires at least one endogenous perturbation showing the proposed feature contributes causally to the claimed output.” Satisfied: no. Show a preregistered cross-state native transcription prediction from selective lamina-tether/silencer disruption, with matched mechanical rescue, viable cell-cycle profiles and redundant-tether controls. Explain retained gene output after short-term detachment and the opposing activation effects.

Upper ladder: Endogenous knockout/rescue, locus-specific NET manipulations, disease alleles, graded lamin levels and temporal depletion were considered as field-valid equivalents. Narrow contexts support Ε, while native readouts, rescue specificity and error-mode independence would be needed for Ζ. The global nominal cannot advance on artificial reporter sufficiency or correlation between gene and topology changes;2025 human triple-loss/speckle rescue is a strong lead but abstract-only access and global transcription/homeostasis changes leave mediator specificity unresolved. No requirement for a human clinical RCT is imposed on a cellular mechanism.

Independence: Hi-C, DamID, FISH and RNA readouts of the same lamin-null cells are complementary assays, not automatically independent causal lines. The 2011/2018 mESC series shares a model and related laboratory; PRR14 domain/localization follow-ups share a tether system. Human cardiomyopathy/progeria and worm disease models are not ordinary all-state replication. Updated 2026 and 2025 papers replace their earlier preprints. Simulated LAD attachment is not another perturbation line. Orthogonal classes reveal real context causality and real alternatives, not convergence on the global nominal.

Native lamin loss and restoration [17, 23, 25]: Genetic loss and rescue reduce unperturbed co-localization explanations, with cell-state and whole-protein pleiotropy remaining.

Envelope-tether deconvolution [26, 27, 12]: Separates filament loss from membrane-tether redundancy; loss duration and differentiation effects still confound direct transcription mediation.

Silencing versus anchoring separations [10, 33, 35, 9]: Tests whether the same proteins or modifications are required for position and output, revealing causal decoupling and promoter-context alternatives.

Mechanics and motor signaling [39, 41, 44]: Orthogonal mechanical/actin/stress endpoints constrain direct-silencing interpretations, without eliminating all architecture effects.

Falsification and pitfalls

Global immediate filament-driven repression prediction challenged by native nulls. Lamin-null competence, lack of detached-LAD gene derepression and minor 72-hour RNA effects after tether loss undermine the full-scope prediction. The uncrossed global boundary and restricted Γ already incorporate this failure; no duplicate numerical downgrade is applied. Additional downgrade: False.

LAD binding treated as repression necessity. Contact maps do not determine causal direction.

Whole lamin loss treated as selective silencer loss. Mechanics, replication stress, motors and differentiation can mediate RNA changes.

Reporter position generalized to native chromatin. Synthetic tethering and multicopy arrays have distinct promoters and activation strengths.

Chromatin and nuclear envelope collapsed into one mechanism. LBR/LAP2/LEM redundancy and H3K9 compaction can remain without lamins.

Multiple assays counted as independent causal studies. Topology and RNA measurements often share the same knockout clones.

Adversarial steelman: above, then below

One rung above, Δ: lamin loss changes topology, native transcription and differentiation, and rescue experiments preserve a real regulatory function. The 2025 human multi-lamin study strengthens the argument by linking SON interaction to organizational and RNA rescue. But SC4 is direct global tethering/enzymatic repression across states, not any RNA response to protein loss. Cell-state reversals, preserved repression after detachment and redundant tethers leave that selective full-scope causal test uncrossed.

One rung below, Β: much of the global narrative rests on LAD maps and expression anticorrelation. Yet local lamin/HDAC, native locus and genetic rescue experiments provide genuine mechanistic support beyond association. Γ preserves those partial-system results without pretending they establish global silencer recruitment.

Retain global Γ and narrow SC2 Ε. A causal architecture effect is not erased by native silencing exceptions, while whole-protein rescue does not by itself identify direct enzymatic repression. The proposed selective interaction experiment is the named blocker.

Final score, causal direction and M/S/D

Scope-matched aggregation is fixed to global SC4 and yields Γ. SC2 has mapped context-specific Ε support, while SC1 remains Β and direct enzyme-recruitment necessity SC3 remains Γ. Whole-lamin deletion can change thousands of genes yet still fail to establish direct global repression: changes can be bidirectional, follow mechanics/stress, or depend on other envelope tethers. This is not a judgment that lamins lack regulatory function.

Native genetic and NET perturbations exclude an epiphenomenal-only role in specific contexts. But global repression can persist without lamin filaments or after major detachment, and no universal necessity, initiating sufficiency and rate limitation are jointly demonstrated. Lamins stabilize architecture, responses and some lineage programmes within an envelope/chromatin network; step 5 best describes that contextual contribution.

Momentum: Mechanistic only. The 2025 human lamin/SON knockout-rescue study (41205174),2026 LBR/LAP2 deconvolution (41735607),2024 LAD genetic screens (39322756) and 2026 lamin-isoform LBR experiments (42153377) actively test mechanisms and redundancy; none completes a selective global silencer-recruitment proof. The 2026B-lamin/speckle original (41909953) supplies actual RNA and positional tests with explicit death/proliferation limits.

Stability: Stable. No verified named pending result was identified that demonstrably determines the full-scope letter; this is a bounded search finding, not proof that none exists.

Divergence: Contested. No manufactured field consensus or arithmetic gap. These dimensions do not change level or confidence.

PROPOSED DECISIVE EXPERIMENTS

Engineer an endogenous lamin allele that loses a specified silencer interaction while preserving filament mechanics, envelope integrity and redundant-tether localization. Compare it with a mechanical-defect allele and expression-matched rescue across predefined stem and differentiated states. Perform short-time-course native nascent RNA plus contact/speckle mapping, with cell-cycle, replication stress and viability controls. Re-tether the enzyme selectively at native affected loci to test whether repression is restored before downstream damage.

Readout: Native nascent transcription, locus contact/topology and speckle distance, independent mechanics and nuclear-integrity measurements. Controls: Endogenous protein levels, enzyme catalytic competence, tether complement, mechanical rescue, cell state/time, cell cycle, replication stress, viability and expression-matched rescue. Supporting: Selective recruitment loss derepresses prespecified native LAD outputs across states, with interaction/locus-specific rescue and no mechanical or global-collapse explanation. Falsifying: Tether/recruitment loss leaves repression intact or changes RNA only after mechanics, stress, differentiation or global transcription collapse.

KNOWLEDGE GAPS

Separate necessity of a silencing enzyme from necessity of its recruitment by lamin.

Quantify native transcription after rapid detachment before chronic epigenetic/stress amplification.

Dissect B-type versus A-type lamin functions and LBR/LAP2/LEM/PRR14 redundancy by cell state.

Test whether speckle distance mediates RNA changes rather than being a correlated consequence of global disorganization.

Separate mechanical and chromatin-tether rescue with endogenous matched alleles.

Retain active LAD promoters and opposing differentiation effects in global prediction tests.

REVIEWER NOTES

Sixty original primary reports were examined, with eight selected original bodies; most full papers/supplements were not audited. The method chapter PMID18602999, narrative PMID29227210 and preprint PMID38826247 were excluded; updated primary PMID40335054 replaces the preprint, while other update-linked reports are likewise counted once. Computational primary PMID42106913 contributes only a model claim, never causal perturbation credit. Citation-context quota was unavailable; no retry or purchase. Consensus browser synthesis was reconciled against these original-source qualifications in the nine comparisons recorded in the Consensus and original-source reconciliation section below. Frozen rubric/index was loaded; final adjudication and sealing remain coordinator tasks, not independent blinded grading.

Search leads, reviews, protocols and correction notices do not pad the primary count. Downloaded XML does not earn examination credit. Linked notices remain attached; unexamined correction details limit inference. This is a coordinator source/claim consistency assessment, not independent blinded calibration.

Consensus and original-source reconciliation

Original 2018 publication Results confirms matched cell-cycle profiles, topology changes and partial lamin B1 add-back rescue, but no enrichment for expression changes among NL-associated genes. Detached LAD genes are not preferentially upregulated. Its publication-year 2018 is preserved separately from the provider's 2017 label; the source is not simply a transcriptional null. Original PMID30201095.

Original body verifies ESC growth/pluripotency and induced TE differentiation without detectable lamin A/C or B, with no relationship between bound promoters and RNA changes. This is a defined native context and does not imply every tissue is lamin-independent. Original PMID22116031.

Original body agrees and identifies membrane-tether redundancy. Additional B-lamin depletion does not enhance the defined LBR/LAP2 loss phenotype. Long-term transcriptome changes include stress/TF amplification and mixed directions; weak H3K27me3-expression correlation does not establish a recruited-enzyme mechanism. Original PMID41735607.

Original Results retains a modest LMNB1 hit in LAD5 and null in LAD6, inability to exclude essential/redundant factors, and NELF native RNA effects whose apparent LAD preference reduces after expression matching. The screen cannot be declared a universal proof of no lamin contribution. Original PMID39322756.

Original Results shows HDAC1 silencing with no significant contact loss, HDAC3 contact loss without comparable repression, and redundant LEM effects. It supports local causality while separating enzyme necessity from lamina-specific recruitment necessity. Original PMID23226217.

Original Results shows Gata4 reduction/allele rescue and opposite effects when A-type lamins are depleted in naive stem versus progenitor/cardiomyocyte stages. B1 loss does not largely mimic cardiac differentiation. Contextual lamina regulation survives the global-repression challenge. Original PMID36333314.

Original body defines a 4 Mb multicopy transgene array whose peripheral transcription can be induced with similar kinetics. This is a meaningful synthetic countertest to universal position-silencing, but it is not every native gene and must remain labeled artificial. Original PMID18195101.

Original primary record and selected Methods/Results verify the 2026 peer-reviewed paper: H1299 CRISPR clones, lower nascent RNA, correlated speckle-distance/RNA changes and increased death/apoptosis with reduced proliferation. Selected body also notes shRNA apoptosis replication. The source was added to the corpus as an actual examined lead; a selective speckle-distance mediator is not independently isolated. Original PMID41909953.

Original updated 2025 abstract shows CEC4 loss affects constrained nuclear migration in a LINC-defective context and a lamin-stabilizing mutation rescues. Anchoring has a mechanical role; this cannot be converted to global transcriptional repression. Its earlier 2024 preprint is excluded from separate primary credit. Original PMID40335054.

Consensus was used to identify literature and cross-check specific claims about design, endpoints, scope and research gaps. Those aspects were checked against original primary abstracts/status records and selected original Methods/Results passages. Consensus output was not treated as original full text. Provider search omissions are not evidence that a study does not exist. Source access and examination receipts are retained. Scite use or monthly unavailability is recorded per case; provider citation counts do not change causal grades.

Research timeline and gaps: Nuclear Lamina as Global Regulator

Selected publication milestones, not an exhaustive history or discovery priority claim.

2006 — 2006 Drosophila genome-wide lamina mapping establishes the descriptive low-expression association. Original PMID16878134.

2008 — 2008 synthetic peripheral transgene targeting retains inducible transcriptional competence. Original PMID18195101.

2011 — 2011 native lamin-null stem cells reveal tissue-building versus global-silencing distinctions. Original PMID22116031.

2012 — 2012 local HDAC/lamin perturbations separate repression and position in Drosophila. Original PMID23226217.

2013 — LBR and A-type lamin tethers show sequential redundancy and opposite developmental effects. Original PMID23374351.

2018 — Triple-lamin knockout/add-back tests topology while detached LAD genes resist uniform derepression. Original PMID30201095.

2024 — 2024 LADgenetic screens reveal local chromatin-regulator and promoter-context dependence. Original PMID39322756.

2026 — 2026 LBR/LAP2 deconvolution separates short detachment from chronic transcription/homeostasis effects. Original PMID41735607.

2026 — 2026B-lamin knockout maps speckle-distance and RNA changes with cell-viability confounding retained. Original PMID41909953.

Research gaps

Separate necessity of a silencing enzyme from necessity of its recruitment by lamin.

Quantify native transcription after rapid detachment before chronic epigenetic/stress amplification.

Dissect B-type versus A-type lamin functions and LBR/LAP2/LEM/PRR14 redundancy by cell state.

Test whether speckle distance mediates RNA changes rather than being a correlated consequence of global disorganization.

Separate mechanical and chromatin-tether rescue with endogenous matched alleles.

Retain active LAD promoters and opposing differentiation effects in global prediction tests.

Boundary experiment

Engineer an endogenous lamin allele that loses a specified silencer interaction while preserving filament mechanics, envelope integrity and redundant-tether localization. Compare it with a mechanical-defect allele and expression-matched rescue across predefined stem and differentiated states. Perform short-time-course native nascent RNA plus contact/speckle mapping, with cell-cycle, replication stress and viability controls. Re-tether the enzyme selectively at native affected loci to test whether repression is restored before downstream damage.

ADVERSARIAL REVIEW AND APPROVAL

Authoring model: Sol 6.1. Adversarial reviewer: Claude Opus 5.5 (Anthropic). Date: 2026-10-14.

Scope of checks. All 60 REFERENCES PMIDs verified against PubMed get_article_metadata: 60/60 resolve to the stated first author, journal, year and DOI; 0 failures; no retraction notice found. Reference 38 is correctly labelled a bioRxiv preprint and is excluded from primary credit in the REVIEWER NOTES. Twelve load-bearing claims were spot-checked against the cited abstracts and the selected bodies, concentrating on the ones that hold the global gate shut: the lamin-null embryonic stem cell result that lamin-B binding correlates with lower expression yet is not required for silencing; the LBR/LAP2 deconvolution's identification of redundant tethers with reduced H3K27me3 and large long-term deregulation; the B-type lamin speckle study's relocation of euchromatin away from speckles with global repression, reduced viability and apoptosis; the triple-knockout topology rescue with matched cell-cycle profiles and no preferential derepression of detached LAD genes; the LAD genetic screen's LMNB1 hit and its NELF effect shrinking after expression matching; the HDAC1/HDAC3 dissociation of silencing from contact loss; the synthetic 4 Mb array that transcribes at the lamina; and the Gata4 stage-dependent rescue. Every checked statement matched its source. Scoring logic was re-derived: caps precede aggregation; the declared scope-matched rule is applied as written, fixed to the global SC4 and explicitly refusing to let the narrower Ε-level SC2 set the headline, which is the correct reading of that rule; the Β/Γ/Δ boundary and the Ζ independence basis were checked. Framework validator re-run.

Findings

Rejected findings (checked, no change). (i) "Best-supported rival" label: competing_models.models_evaluated[0] is the rank-1 model with is_nominal: false, so the label and the printed rank order are both correct. The renderer defect seen in sibling reviews is absent here. (ii) Scope-matched aggregation: the derivation fixes the headline to the global SC4 and reports the narrower SC2 Ε separately, which is exactly what the rule requires. No arithmetic or wording error. (iii) Momentum "Mechanistic only": the artifact names four active mechanistic programmes and states that none completes a selective global silencer-recruitment proof. Correct value; no "Decisive work underway" claim to test. (iv) No collective-author defect of either known form. Every first author in the reference list is a personal surname; there is no leading-comma instance and no organisation fragment such as "Group", "Network" or "Consortium" standing in for a consortium name. (v) Reference 38 is a 2026 bioRxiv preprint. It is labelled as such in the reference line and excluded from primary causal credit in the REVIEWER NOTES, and rests_on_non_peer_reviewed_work is handled accordingly. Not an error. (vi) PubMed title fields dropping italicised gene or species names. Declared non-error. (vii) No spliced "The earlier adversarial approval refers to its original edition" sentence is present. (viii) The 2026 LBR/LAP2 rival line cites "only minor RNA changes after 72 h detachment" while the PubMed abstract reports massive deregulation after long-term loss. Checked: the review draws the 72-hour figure from the selected body and explicitly contrasts short detachment with chronic loss in the Consensus section and in the subclaim rationales. Consistent, not a misattribution. (ix) Levels: SC1 Β, SC2 Ε, SC3 Γ, SC4 Γ and the headline Γ follow from the quoted caps and the declared aggregation rule. No letter required a change.

Scorecard change. final_score.confidence_rationale only. The level, confidence, subclaim levels, tally and every other field are unchanged. Validator re-run: PASS.

Residual limitations. Eight of 60 records were examined at partial-body depth; the rest are abstract or status examinations, as the banner states. The citation-context quota was unavailable, as the REVIEWER NOTES record. One erratum remains attached without an identifier, so its content could not be checked.

Approval: Following adversarial review and the corrections listed above, the revised document is approved. - Claude Opus 5.5 (Anthropic), 2026-10-14.

REFERENCES

1. Pickersgill H, Kalverda B, de Wit E et al. Characterization of the Drosophila melanogaster genome at the nuclear lamina. Nature genetics. 2006. PMID 16878134. DOI: 10.1038/ng1852. Access: abstract_metadata. Study: PMID16878134.

2. Guelen L, Pagie L, Brasset E et al. Domain organization of human chromosomes revealed by mapping of nuclear lamina interactions. Nature. 2008. PMID 18463634. DOI: 10.1038/nature06947. Access: abstract_metadata. Study: PMID18463634.

3. Kind J, Pagie L, de Vries SS et al. Genome-wide maps of nuclear lamina interactions in single human cells. Cell. 2015. PMID 26365489. DOI: 10.1016/j.cell.2015.08.040. Access: abstract_metadata. Study: PMID26365489.

4. Shah PP, Keough KC, Gjoni K et al. An atlas of lamina-associated chromatin across twelve human cell types reveals an intermediate chromatin subtype. Genome biology. 2023. PMID 36691074. DOI: 10.1186/s13059-023-02849-5. Access: abstract_metadata. Study: PMID36691074.

5. Kind J, Pagie L, Ortabozkoyun H et al. Single-cell dynamics of genome-nuclear lamina interactions. Cell. 2013. PMID 23523135. DOI: 10.1016/j.cell.2013.02.028. Access: abstract_metadata. Study: PMID23523135.

6. Reddy KL, Zullo JM, Bertolino E et al. Transcriptional repression mediated by repositioning of genes to the nuclear lamina. Nature. 2008. PMID 18272965. DOI: 10.1038/nature06727. Access: abstract_metadata. Study: PMID18272965.

7. Kumaran RI, Spector DL. A genetic locus targeted to the nuclear periphery in living cells maintains its transcriptional competence. The Journal of cell biology. 2008. PMID 18195101. DOI: 10.1083/jcb.200706060. Access: full_text_partial. Study: PMID18195101.

8. Leemans C, van der Zwalm MCH, Brueckner L et al. Promoter-Intrinsic and Local Chromatin Features Determine Gene Repression in LADs. Cell. 2019. PMID 30982597. DOI: 10.1016/j.cell.2019.03.009. Access: abstract_metadata. Study: PMID30982597.

9. Manzo SG, Mazouzi A, Leemans C et al. Chromatin protein complexes involved in gene repression in lamina-associated domains. The EMBO journal. 2024. PMID 39322756. DOI: 10.1038/s44318-024-00214-1. Access: full_text_partial. Study: PMID39322756.

10. Milon BC, Cheng H, Tselebrovsky MV et al. Role of histone deacetylases in gene regulation at nuclear lamina. PloS one. 2012. PMID 23226217. DOI: 10.1371/journal.pone.0049692. Access: full_text_partial. Study: PMID23226217.

11. Madsen-Østerbye J, Abdelhalim M, Pickering SH et al. Gene Regulatory Interactions at Lamina-Associated Domains. Genes. 2023. PMID 36833261. DOI: 10.3390/genes14020334. Access: abstract_metadata. Study: PMID36833261.

12. Robson MI, de Las Heras JI, Czapiewski R et al. Tissue-Specific Gene Repositioning by Muscle Nuclear Membrane Proteins Enhances Repression of Critical Developmental Genes during Myogenesis. Molecular cell. 2016. PMID 27264872. DOI: 10.1016/j.molcel.2016.04.035. Access: abstract_metadata. Study: PMID27264872.

13. Smith CL, Poleshko A, Epstein JA. The nuclear periphery is a scaffold for tissue-specific enhancers. Nucleic acids research. 2021. PMID 34023908. DOI: 10.1093/nar/gkab392. Access: abstract_metadata. Study: PMID34023908.

14. Heinz KS, Casas-Delucchi CS, Török T et al. Peripheral re-localization of constitutive heterochromatin advances its replication timing and impairs maintenance of silencing marks. Nucleic acids research. 2018. PMID 29750270. DOI: 10.1093/nar/gky368. Access: abstract_metadata. Study: PMID29750270.

15. Kim Y, Sharov AA, McDole K et al. Mouse B-type lamins are required for proper organogenesis but not by embryonic stem cells. Science (New York, N.Y.). 2011. PMID 22116031. DOI: 10.1126/science.1211222. Access: full_text_partial. Study: MOUSE_LAMIN_NULL_ESC_SERIES.

16. Amendola M, van Steensel B. Nuclear lamins are not required for lamina-associated domain organization in mouse embryonic stem cells. EMBO reports. 2015. PMID 25784758. DOI: 10.15252/embr.201439789. Access: abstract_metadata. Study: PMID25784758.

17. Zheng X, Hu J, Yue S et al. Lamins Organize the Global Three-Dimensional Genome from the Nuclear Periphery. Molecular cell. 2018. PMID 30201095. DOI: 10.1016/j.molcel.2018.05.017. Access: full_text_partial. Study: MOUSE_LAMIN_NULL_ESC_SERIES.

18. Wang Z, Ji Q, Liu Z et al. Nuclear-lamin-guided plastic positioning and folding of the human genome. Cell reports. 2025. PMID 41205174. DOI: 10.1016/j.celrep.2025.116529. Access: abstract_metadata. Study: PMID41205174.

19. Noguchi A, Ito K, Uosaki Y et al. Decreased Lamin B1 Levels Affect Gene Positioning and Expression in Postmitotic Neurons. Neuroscience research. 2021. PMID 34058264. DOI: 10.1016/j.neures.2021.05.011. Access: abstract_metadata. Study: PMID34058264.

20. Ranade D, Pradhan R, Jayakrishnan M et al. Lamin A/C and Emerin depletion impacts chromatin organization and dynamics in the interphase nucleus. BMC molecular and cell biology. 2019. PMID 31117946. DOI: 10.1186/s12860-019-0192-5. Access: abstract_metadata. Study: PMID31117946.

21. Ulianov SV, Doronin SA, Khrameeva EE et al. Nuclear lamina integrity is required for proper spatial organization of chromatin in Drosophila. Nature communications. 2019. PMID 30862957. DOI: 10.1038/s41467-019-09185-y. Access: abstract_metadata. Study: PMID30862957.

22. Nazer E, Dale RK, Chinen M et al. Argonaute2 and LaminB modulate gene expression by controlling chromatin topology. PLoS genetics. 2018. PMID 29529026. DOI: 10.1371/journal.pgen.1007276. Access: abstract_metadata. Study: PMID29529026.

23. Wang Y, Elsherbiny A, Kessler L et al. Lamin A/C-dependent chromatin architecture safeguards naïve pluripotency to prevent aberrant cardiovascular cell fate and function. Nature communications. 2022. PMID 36333314. DOI: 10.1038/s41467-022-34366-7. Access: full_text_partial. Study: PMID36333314.

24. Ikegami K, Secchia S, Almakki O et al. Phosphorylated Lamin A/C in the Nuclear Interior Binds Active Enhancers Associated with Abnormal Transcription in Progeria. Developmental cell. 2020. PMID 32208162. DOI: 10.1016/j.devcel.2020.02.011. Access: abstract_metadata. Study: PMID32208162.

25. Pradhan R, Nallappa MJ, Sengupta K. Lamin A/C modulates spatial organization and function of the Hsp70 gene locus via nuclear myosin I. Journal of cell science. 2020. PMID 31988151. DOI: 10.1242/jcs.236265. Access: abstract_metadata. Study: PMID31988151.

26. Solovei I, Wang AS, Thanisch K et al. LBR and lamin A/C sequentially tether peripheral heterochromatin and inversely regulate differentiation. Cell. 2013. PMID 23374351. DOI: 10.1016/j.cell.2013.01.009. Access: abstract_metadata. Study: PMID23374351.

27. Lewis R, Sinigiani V, Maziak N et al. LBR and LAP2 mediate heterochromatin tethering to the nuclear periphery to preserve genome homeostasis. Nature cell biology. 2026. PMID 41735607. DOI: 10.1038/s41556-025-01822-7. Access: full_text_partial. Study: PMID41735607.

28. Odell J, Nedza K, Sopilniak-Mints A et al. Antagonistic contributions of A-type and B-type lamins to LBR localization and dynamics. Nucleus (Austin, Tex.). 2026. PMID 42153377. DOI: 10.1080/19491034.2026.2673721. Access: abstract_metadata. Study: PMID42153377.

29. Thanisch K, Song C, Engelkamp D et al. Nuclear envelope localization of LEMD2 is developmentally dynamic and lamin A/C dependent yet insufficient for heterochromatin tethering. Differentiation; research in biological diversity. 2017. PMID 28056360. DOI: 10.1016/j.diff.2016.12.002. Access: abstract_metadata. Study: PMID28056360.

30. Poleshko A, Mansfield KM, Burlingame CC et al. The human protein PRR14 tethers heterochromatin to the nuclear lamina during interphase and mitotic exit. Cell reports. 2013. PMID 24209742. DOI: 10.1016/j.celrep.2013.09.024. Access: abstract_metadata. Study: PRR14_TETHER_SERIES.

31. Dunlevy KL, Medvedeva V, Wilson JE et al. The PRR14 heterochromatin tether encodes modular domains that mediate and regulate nuclear lamina targeting. Journal of cell science. 2020. PMID 32317397. DOI: 10.1242/jcs.240416. Access: abstract_metadata. Study: PRR14_TETHER_SERIES.

32. Kiseleva AA, Cheng YC, Smith CL et al. PRR14 organizes H3K9me3-modified heterochromatin at the nuclear lamina. Nucleus (Austin, Tex.). 2023. PMID 36633363. DOI: 10.1080/19491034.2023.2165602. Access: abstract_metadata. Study: PRR14_TETHER_SERIES.

33. Gonzalez-Sandoval A, Towbin BD, Kalck V et al. Perinuclear Anchoring of H3K9-Methylated Chromatin Stabilizes Induced Cell Fate in C. elegans Embryos. Cell. 2015. PMID 26607792. DOI: 10.1016/j.cell.2015.10.066. Access: abstract_metadata. Study: PMID26607792.

34. Cabianca DS, Muñoz-Jiménez C, Kalck V et al. Active chromatin marks drive spatial sequestration of heterochromatin in C. elegans nuclei. Nature. 2019. PMID 31118512. DOI: 10.1038/s41586-019-1243-y. Access: abstract_metadata. Study: PMID31118512.

35. Bian Q, Anderson EC, Yang Q et al. Histone H3K9 methylation promotes formation of genome compartments in Caenorhabditis elegans via chromosome compaction and perinuclear anchoring. Proceedings of the National Academy of Sciences of the United States of America. 2020. PMID 32385148. DOI: 10.1073/pnas.2002068117. Access: abstract_metadata. Study: PMID32385148.

36. Harr JC, Schmid CD, Muñoz-Jiménez C et al. Loss of an H3K9me anchor rescues laminopathy-linked changes in nuclear organization and muscle function in an Emery-Dreifuss muscular dystrophy model. Genes & development. 2020. PMID 32139421. DOI: 10.1101/gad.332213.119. Access: abstract_metadata. Study: PMID32139421.

37. Gregory EF, Luxton GWG, Starr DA. Nuclear deformability depends on H3K9-methylated heterochromatin anchorage to the nuclear periphery in Caenorhabditis elegans. Genetics. 2025. PMID 40335054. DOI: 10.1093/genetics/iyaf086. Access: abstract_metadata. Study: PMID40335054.

38. Ding X, Wang G, Elnatan D et al. Nuclear envelope-dependent heterochromatin positioning gates the timing of nucleolar assembly in the early embryo. bioRxiv : the preprint server for biology. 2026. PMID 42538931. DOI: 10.64898/2026.07.20.739428. Access: abstract_metadata. Study: PMID42538931.

39. Lammerding J, Schulze PC, Takahashi T et al. Lamin A/C deficiency causes defective nuclear mechanics and mechanotransduction. The Journal of clinical investigation. 2004. PMID 14755334. DOI: 10.1172/JCI19670. Access: abstract_metadata. Study: PMID14755334.

40. Swift J, Ivanovska IL, Buxboim A et al. Nuclear lamin-A scales with tissue stiffness and enhances matrix-directed differentiation. Science (New York, N.Y.). 2013. PMID 23990565. DOI: 10.1126/science.1240104. Access: abstract_metadata. Study: PMID23990565.

41. Ho CY, Jaalouk DE, Vartiainen MK et al. Lamin A/C and emerin regulate MKL1-SRF activity by modulating actin dynamics. Nature. 2013. PMID 23644458. DOI: 10.1038/nature12105. Access: abstract_metadata. Study: PMID23644458.

42. Goelzer M, Dudakovic A, Olcum M et al. Lamin A/C Is Dispensable to Mechanical Repression of Adipogenesis. International journal of molecular sciences. 2021. PMID 34205295. DOI: 10.3390/ijms22126580. Access: abstract_metadata. Study: PMID34205295.

43. Jabre S, Cherchame E, Pinzón N et al. Lamin A/C protects chromatin accessibility during mechanical loading in human skeletal muscle. Cell communication and signaling : CCS. 2025. PMID 41126185. DOI: 10.1186/s12964-025-02437-z. Access: abstract_metadata. Study: PMID41126185.

44. Sikder K, Phillips E, Zhong Z et al. Perinuclear damage from nuclear envelope deterioration elicits stress responses that contribute to LMNA cardiomyopathy. Science advances. 2024. PMID 38718107. DOI: 10.1126/sciadv.adh0798. Access: abstract_metadata. Study: PMID38718107.

45. Osorio FG, Bárcena C, Soria-Valles C et al. Nuclear lamina defects cause ATM-dependent NF-κB activation and link accelerated aging to a systemic inflammatory response. Genes & development. 2012. PMID 23019125. DOI: 10.1101/gad.197954.112. Access: abstract_metadata. Study: PMID23019125.

46. Karoutas A, Szymanski W, Rausch T et al. The NSL complex maintains nuclear architecture stability via lamin A/C acetylation. Nature cell biology. 2019. PMID 31576060. DOI: 10.1038/s41556-019-0397-z. Access: abstract_metadata. Study: PMID31576060.

47. Vazquez BN, Thackray JK, Simonet NG et al. SIRT7 mediates L1 elements transcriptional repression and their association with the nuclear lamina. Nucleic acids research. 2019. PMID 31226208. DOI: 10.1093/nar/gkz519. Access: abstract_metadata. Study: PMID31226208.

48. Zhang J, Ao Y, Zhang Z et al. Lamin A safeguards the m6 A methylase METTL14 nuclear speckle reservoir to prevent cellular senescence. Aging cell. 2020. PMID 32813328. DOI: 10.1111/acel.13215. Access: abstract_metadata. Study: PMID32813328.

49. Coste Pradas J, Auguste G, Matkovich SJ et al. Identification of Genes and Pathways Regulated by Lamin A in Heart. Journal of the American Heart Association. 2020. PMID 32805188. DOI: 10.1161/JAHA.119.015690. Access: abstract_metadata. Study: PMID32805188.

50. Owens DJ, Messéant J, Moog S et al. Lamin-Related Congenital Muscular Dystrophy Alters Mechanical Signaling and Skeletal Muscle Growth. International journal of molecular sciences. 2020. PMID 33396724. DOI: 10.3390/ijms22010306. Access: abstract_metadata. Study: PMID33396724.

51. Liu H, Liu X, Luo S et al. Lamin A/C mediates microglial activation by modulating cell proliferation and immune response. Journal of neuroscience research. 2024. PMID 38284866. DOI: 10.1002/jnr.25263. Access: abstract_metadata. Study: PMID38284866.

52. Toribio-Fernández R, Herrero-Fernandez B, Zorita V et al. Lamin A/C deficiency in CD4+ T-cells enhances regulatory T-cells and prevents inflammatory bowel disease. The Journal of pathology. 2019. PMID 31372995. DOI: 10.1002/path.5332. Access: abstract_metadata. Study: PMID31372995.

53. Ramirez-Martinez A, Zhang Y, Chen K et al. The nuclear envelope protein Net39 is essential for muscle nuclear integrity and chromatin organization. Nature communications. 2021. PMID 33514739. DOI: 10.1038/s41467-021-20987-x. Access: abstract_metadata. Study: PMID33514739.

54. Poulet A, Duc C, Voisin M et al. The LINC complex contributes to heterochromatin organisation and transcriptional gene silencing in plants. Journal of cell science. 2017. PMID 28049722. DOI: 10.1242/jcs.194712. Access: abstract_metadata. Study: PMID28049722.

55. Barton LJ, Wilmington SR, Martin MJ et al. Unique and shared functions of nuclear lamina LEM domain proteins in Drosophila. Genetics. 2014. PMID 24700158. DOI: 10.1534/genetics.114.162941. Access: abstract_metadata. Study: PMID24700158.

56. Perovanovic J, Dell'Orso S, Gnochi VF et al. Laminopathies disrupt epigenomic developmental programs and cell fate. Science translational medicine. 2016. PMID 27099177. DOI: 10.1126/scitranslmed.aad4991. Access: abstract_metadata. Study: PMID27099177.

57. Delafrouz P, Farooq H, Du L et al. Effects of chromatin-lamina attachment on extra-long-range chromatin interactions. Biophysical journal. 2026. PMID 42106913. DOI: 10.1016/j.bpj.2026.05.011. Access: abstract_metadata. Study: PMID42106913.

58. Labade AS, Chiang ZD, Comenho C et al. Expansion in situ genome sequencing links nuclear abnormalities to aberrant chromatin regulation. Science (New York, N.Y.). 2025. PMID 40440430. DOI: 10.1126/science.adt2781. Access: abstract_metadata. Study: PMID40440430.

59. Keenan CR, Coughlan HD, Iannarella N et al. Suv39h-catalyzed H3K9me3 is critical for euchromatic genome organization and the maintenance of gene transcription. Genome research. 2024. PMID 38719473. DOI: 10.1101/gr.279119.124. Access: abstract_metadata. Study: PMID38719473.

60. Shin GS, Kim J, Kim JY et al. B-type lamins maintain transcriptional homeostasis by spatially controlling chromatin-speckle proximity. Nucleic acids research. 2026. PMID 41909953. DOI: 10.1093/nar/gkag283. Access: full_text_partial. Study: PMID41909953.

Source-specific evidence cards

[1] Characterization of the Drosophila melanogaster genome at the nuclear lamina.

Shows: Drosophila lamin-contact genes are silent, late-replicating and depleted of active marks; activation reduces binding.

Does not show: Genome mapping and activation-linked movement do not identify which direction causes repression.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC1, SC4.

[2] Domain organization of human chromosomes revealed by mapping of nuclear lamina interactions.

Shows: Human fibroblast maps identify large LADs with low expression and sharp domain boundaries.

Does not show: Association is not necessary enzymatic repression; linked erratum lacks identifier/details in examined metadata.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. Erratum In: notice attached, no PMID supplied. Subclaims: SC1, SC4.

[3] Genome-wide maps of nuclear lamina interactions in single human cells.

Shows: Single-cell human maps show variable and stable LAD contacts inversely linked to gene activity.

Does not show: Contact consistency and histone correlation do not selectively manipulate lamins or demonstrate transcriptional necessity.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC1, SC4.

[4] An atlas of lamina-associated chromatin across twelve human cell types reveals an intermediate chromatin subtype.

Shows: Twelve-cell-type atlas identifies deep and intermediate peripheral chromatin with different expression/accessibility.

Does not show: Atlas broadens descriptive scope, not causal scope; proximity to lamina differs from direct contact.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC1, SC4.

[5] Single-cell dynamics of genome-nuclear lamina interactions.

Shows: Single-cell LAD contacts are intermittent, reshuffled after mitosis and regulated by G9a.

Does not show: H3K9 methylation may regulate anchoring; contact-memory assay does not establish lamina recruitment as the obligatory source of silencing.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC1, SC2, SC3.

[6] Transcriptional repression mediated by repositioning of genes to the nuclear lamina.

Shows: Inducible INM tethering can reposition and repress selected chromosomal regions after mitosis.

Does not show: Ectopic targeting tests sufficiency of the construct/context, not necessity of endogenous lamin-mediated repression genome-wide.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[7] A genetic locus targeted to the nuclear periphery in living cells maintains its transcriptional competence.

Shows: Lamin-B1-tethered peripheral transgene array retains inducible transcription and similar induction kinetics.

Does not show: Large multicopy synthetic array and strong Tet activation are not every native promoter; peripheral positioning is not universally sufficient to silence.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. Selected body sections: 1:Results:paragraph0, 1:Results:paragraph17, 1:Results:paragraph20. No complete-paper or supplement audit claimed. none_found. Subclaims: SC3, SC4.

[8] Promoter-Intrinsic and Local Chromatin Features Determine Gene Repression in LADs.

Shows: Promoters moved from LADs and reporters inserted across chromatin show promoter/local-context-dependent repression and escapers.

Does not show: Relocation/reporter designs establish contextual sufficiency, not lamina filament or recruited-enzyme necessity for all native LAD genes.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC1, SC3, SC4.

[9] Chromatin protein complexes involved in gene repression in lamina-associated domains.

Shows: LAD reporter screens identify many chromatin regulators and few envelope hits; LMNB1 is modest in one LAD and null in another; native-gene CRISPRi tests NELF.

Does not show: Essential proteins and redundancy may be missed; matched-expression analysis reduces apparent LAD preference. Native NELF effect does not prove its recruitment by lamina.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. Selected body sections: 1:Results:paragraph9, 1:Results:paragraph14, 1:Results:paragraph22, 1:Results:paragraph24, 1:Results:paragraph25. No complete-paper or supplement audit claimed. none_found. Subclaims: SC3, SC4.

[10] Role of histone deacetylases in gene regulation at nuclear lamina.

Shows: Drosophila lamin and HDAC knockdowns identify local chromatin/transcription effects; HDAC1 silences while HDAC3 contributes anchoring.

Does not show: HDAC1 acts beyond tightly bound genes and changes growth modestly; selective lamina-HDAC interaction loss/rescue is absent. Local support is not global enzyme necessity.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. Selected body sections: 2:Results and Discussion:paragraph0, 2:Results and Discussion:paragraph2, 2:Results and Discussion:paragraph4, 2:Results and Discussion:paragraph6, 2:Results and Discussion:paragraph8. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[11] Gene Regulatory Interactions at Lamina-Associated Domains.

Shows: Active in-LAD genes contact enhancers; A-type but not B1 lamins contribute to repression near one active-region border.

Does not show: Limited loci and differentiation state; not every LAD is silent or regulated identically, and contact alone is not enhancer causality.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC1, SC2, SC3.

[12] Tissue-Specific Gene Repositioning by Muscle Nuclear Membrane Proteins Enhances Repression of Critical Developmental Genes during Myogenesis.

Shows: Muscle-specific NET depletion/repositioning changes selected developmental-gene repression and myogenesis.

Does not show: NETs rather than lamin filaments are targeted; combined loss affects differentiation. Tissue-specific architecture does not establish a global lamin mechanism.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[13] The nuclear periphery is a scaffold for tissue-specific enhancers.

Shows: Peripheral H3K9me2-only enhancer domains have limited LaminB interaction and differ from LADs.

Does not show: Poised enhancer mapping is descriptive; nuclear periphery cannot be treated as synonymous with lamin contact or complete inactivity.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC1, SC4.

[14] Peripheral re-localization of constitutive heterochromatin advances its replication timing and impairs maintenance of silencing marks.

Shows: Peripheral relocation advances heterochromatin replication and impairs silencing-mark maintenance.

Does not show: Synthetic repositioning and replication endpoints do not prove endogenous transcriptional output; it opposes uniform repressive direction.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[15] Mouse B-type lamins are required for proper organogenesis but not by embryonic stem cells.

Shows: B-lamin-null ESCs retain self-renewal and differentiation; expression changes do not correlate with lamin-bound promoters, while organogenesis requires lamins.

Does not show: Mouse ESC/TE contexts differ from tissues and chronic compensation is possible; lamin absence is not absence of all envelope tethers.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. Selected body sections: 1:Main text:paragraph3, 1:Main text:paragraph4, 1:Main text:paragraph9. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[16] Nuclear lamins are not required for lamina-associated domain organization in mouse embryonic stem cells.

Shows: Essentially all-lamin removal leaves genome-wide emerin-contact organization detectable in mouse ESCs.

Does not show: Emerin marks envelope contact, not every mesoscale interaction or functional output; redundancy and cell state remain.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[17] Lamins Organize the Global Three-Dimensional Genome from the Nuclear Periphery.

Shows: Lamin TKO changes selected LAD/topological interactions and B1 restoration partly reverses topology with matched cell-cycle profiles.

Does not show: Detached LAD genes are not preferentially upregulated; RNA changes correlate with altered interactions but selective topology-to-transcription mediation is incomplete. Re-expression also creates non-native interactions.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. Selected body sections: 1:Results:paragraph0, 1:Results:paragraph4, 1:Results:paragraph15, 1:Results:paragraph17. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[18] Nuclear-lamin-guided plastic positioning and folding of the human genome.

Shows: Human lamin KO maps state-dependent genome/speckle disorganization and lower transcription; WT-A versus SON-binding-defective mutant rescue differs.

Does not show: Whole-protein chronic loss and reduced global transcription/homeostasis limit specificity; original abstract only, not audited Methods or matched-rescue levels.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[19] Decreased Lamin B1 Levels Affect Gene Positioning and Expression in Postmitotic Neurons.

Shows: LaminB1 decline accompanies neuronal locus movement and ectopic B1 blocks movement/Egr3 expression.

Does not show: Overexpression demonstrates a construct effect, not endogenous-B1 necessity or global silencing; maturation is a concurrent change.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[20] Lamin A/C and Emerin depletion impacts chromatin organization and dynamics in the interphase nucleus.

Shows: LaminA/emerin depletion changes actin/NM1, chromatin mobility, locus positioning and selected expression; motor/actin interventions restore mobility.

Does not show: Cytoskeletal alterations provide an alternative mediator; mobility rescue is not necessarily transcriptional rescue or direct lamina silencing.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[21] Nuclear lamina integrity is required for proper spatial organization of chromatin in Drosophila.

Shows: Drosophila NL disruption changes LAD compaction/acetylation/background expression and global contacts.

Does not show: Chronic RNAi and polymer simulations do not isolate a unique enzymatic silencing route; organism/cell context restricts inference.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[22] Argonaute2 and LaminB modulate gene expression by controlling chromatin topology.

Shows: AGO2 null versus catalytic mutation and lamin B depletion distinguish topology-linked regulation at an endogenous Drosophila locus.

Does not show: AGO2 has multiple nuclear functions; endogenous local regulation is not proof of lamina-recruited enzyme necessity genome-wide.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[23] Lamin A/C-dependent chromatin architecture safeguards naïve pluripotency to prevent aberrant cardiovascular cell fate and function.

Shows: Lmna loss alters naive stem-cell cardiac fate and architecture, with Gata4 reduction/allele rescue; effects reverse in progenitors/cardiomyocytes and differ from B1 loss.

Does not show: Mechanistic narrowing identifies a TF-mediated context, but no selective tethering-versus-mechanics allele proves global LAD enzymatic repression. Disease point mutations differ from null.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. Selected body sections: 1:Results:paragraph5, 1:Results:paragraph27, 1:Results:paragraph41, 1:Results:paragraph43. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[24] Phosphorylated Lamin A/C in the Nuclear Interior Binds Active Enhancers Associated with Abnormal Transcription in Progeria.

Shows: Interior phospho-lamin A/C binds active enhancers rather than LADs, with altered enhancer/expression patterns in progeria.

Does not show: Binding and disease association do not demonstrate direct enhancer causality; intranuclear lamins are distinct from peripheral tethering.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[25] Lamin A/C modulates spatial organization and function of the Hsp70 gene locus via nuclear myosin I.

Shows: LaminA/C and nuclear myosin are required for heat-shock Hsp70 locus repositioning, speckle organization and induction.

Does not show: Inducible activation rather than repression; motor, stress and structure effects are intertwined and locus-specific.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[26] LBR and lamin A/C sequentially tether peripheral heterochromatin and inversely regulate differentiation.

Shows: LBR and lamin A/C sequentially/redundantly tether heterochromatin; combined absence inverts architecture and tether losses have opposite myoblast expression effects.

Does not show: Redundant cell-specific NE network rather than one universal lamin repression pathway; topology inversion is not necessarily transcriptional loss.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[27] LBR and LAP2 mediate heterochromatin tethering to the nuclear periphery to preserve genome homeostasis.

Shows: LBR/LAP2 redundancy maintains peripheral heterochromatin; short-term detachment changes expression little, prolonged knockout changes expression/marks and cell fate.

Does not show: Additional B-lamin depletion does not enhance defined tether-loss phenotype; long-term stress/TF amplification and mixed direction prevent direct enzymatic causality at all LADs.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. Selected body sections: 1:Results:paragraph12, 1:Results:paragraph19, 1:Results:paragraph23, 1:Results:paragraph32. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[28] Antagonistic contributions of A-type and B-type lamins to LBR localization and dynamics.

Shows: Lamin isoform re-expression in null fibroblasts differentially alters LBR anchorage and mobility.

Does not show: Ectopic expression and phosphorylation effects define architecture, not a transcriptional endpoint or universal direct gene repression; preprint not counted separately.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. Update Of: PMID41757046. Subclaims: SC2, SC3.

[29] Nuclear envelope localization of LEMD2 is developmentally dynamic and lamin A/C dependent yet insufficient for heterochromatin tethering.

Shows: LEMD2 localization depends on lamin A/C but LEMD2 alone or with lamin C fails to restore peripheral heterochromatin in rods.

Does not show: Negative synthetic rescue tests one candidate network component; does not exclude other redundant tethers or all roles for lamins.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[30] The human protein PRR14 tethers heterochromatin to the nuclear lamina during interphase and mitotic exit.

Shows: PRR14 links HP1-marked chromatin and lamina with ordered mitotic reassembly.

Does not show: Anchoring/localization function is not demonstrated necessary global transcriptional silencing.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[31] The PRR14 heterochromatin tether encodes modular domains that mediate and regulate nuclear lamina targeting.

Shows: PRR14 domain dissection separates chromatin and lamina binding with phosphorylation regulation.

Does not show: Construct localization sufficiency and dynamics do not prove natural gene-output dependence.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[32] PRR14 organizes H3K9me3-modified heterochromatin at the nuclear lamina.

Shows: PRR14/HP1 interactions dynamically organize H3K9me3 chromatin at lamina independent of mitosis.

Does not show: Imaging and HP1 domain manipulation define tether biology; endogenous transcriptional mediation remains untested in the examined abstract.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[33] Perinuclear Anchoring of H3K9-Methylated Chromatin Stabilizes Induced Cell Fate in C. elegans Embryos.

Shows: CEC4 is necessary for endogenous worm heterochromatin anchoring but not transcriptional repression, while affecting induced cell-fate commitment.

Does not show: CEC4 localizes independently of nuclear lamin; ectopic muscle induction is a restricted cell-fate test, not global natural differentiation necessity.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[34] Active chromatin marks drive spatial sequestration of heterochromatin in C. elegans nuclei.

Shows: MRG1/CEC4 and CBP1/ATF8 epistasis separates active-chromatin retention from direct peripheral anchoring in worms.

Does not show: Distinct embryonic/differentiated contexts and broad acetylation changes; this is not a lamina-recruited silencer mechanism.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[35] Histone H3K9 methylation promotes formation of genome compartments in Caenorhabditis elegans via chromosome compaction and perinuclear anchoring.

Shows: H3K9 methyltransferase and CEC4 mutants impair compartments through separable compaction and anchoring mechanisms with little expression change.

Does not show: Gene expression remains largely intact despite compartment switching; heterochromatin self-association and anchoring cannot be equated with lamin-global repression.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[36] Loss of an H3K9me anchor rescues laminopathy-linked changes in nuclear organization and muscle function in an Emery-Dreifuss muscular dystrophy model.

Shows: CEC4 ablation rescues lamin-mutant worm positioning, some transcription and muscle function.

Does not show: Mutant forced disease model scope is restricted; relieving attachment helps, opposing a uniform more-tethering-equals-healthier-repression model.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[37] Nuclear deformability depends on H3K9-methylated heterochromatin anchorage to the nuclear periphery in Caenorhabditis elegans.

Shows: CEC4-mediated anchoring contributes to nuclear migration/deformability in LINC-defective worms and lamin-stabilizing mutation rescues.

Does not show: Mechanical phenotype, conditional LINC background and gene-output absence; anchoring has a mechanical role rather than proof of global transcriptional primacy.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[38] Nuclear envelope-dependent heterochromatin positioning gates the timing of nucleolar assembly in the early embryo.

Shows: LINC/lamin depletion alters early nucleolar timing, with CEC4 epistasis and heterochromatin spatial changes.

Does not show: Embryonic assembly phenotype differs from LAD transcription; nuclear-envelope perturbations have multiple structural/cell-cycle functions.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[39] Lamin A/C deficiency causes defective nuclear mechanics and mechanotransduction.

Shows: Lmna-null fibroblasts show impaired mechanical resistance, survival under strain and mechanically activated NFkB transcription.

Does not show: Functional mechanics is a real lamin contribution; viability and cytoskeletal signaling must be separated from direct LAD repression.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[40] Nuclear lamin-A scales with tissue stiffness and enhances matrix-directed differentiation.

Shows: LaminA levels track tissue stiffness and graded manipulation modifies matrix-directed differentiation and receptor trafficking.

Does not show: Stiffness-response feedback and level manipulation are not direct enzymatic repression or complete separation of mechanics from regulation.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[41] Lamin A/C and emerin regulate MKL1-SRF activity by modulating actin dynamics.

Shows: Lamin mutants alter actin/MKL1-SRF signaling and emerin expression restores trafficking and actin dynamics.

Does not show: Ectopic rescue and mechanical/nuclear-actin mediation do not establish peripheral chromatin recruitment as the cause.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[42] Lamin A/C Is Dispensable to Mechanical Repression of Adipogenesis.

Shows: LaminA/C knockdown leaves vibration-induced adipogenesis repression and focal-adhesion activation intact despite nuclear mechanical changes.

Does not show: Specific mechanical protocol and partial depletion restrict generalization; not every mechanotransduction response requires A-type lamin.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[43] Lamin A/C protects chromatin accessibility during mechanical loading in human skeletal muscle.

Shows: LaminA/C-deficient human myotubes show amplified stretch-related deformation, accessibility and transcriptional stress responses.

Does not show: Mechanical challenge and damage responses are inseparable in this design; ATAC/marks alone would not establish regulation, while accompanying RNA still lacks direct tether specificity.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[44] Perinuclear damage from nuclear envelope deterioration elicits stress responses that contribute to LMNA cardiomyopathy.

Shows: Adult cardiomyocyte Lmna deletion triggers perinuclear stress before cardiac dysfunction; stress/autophagy drugs delay disease.

Does not show: Therapeutic benefit identifies a downstream stress pathway, not universal LAD repression; mutant disease model and pleiotropic drugs remain.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. Update Of: PMID36824975. Subclaims: SC2, SC4.

[45] Nuclear lamina defects cause ATM-dependent NF-κB activation and link accelerated aging to a systemic inflammatory response.

Shows: Two prelamin/progeria models show ATM/NEMO/NFkB inflammation, with genetic/pharmacologic blockade improving disease and survival.

Does not show: Accelerated-aging genetic models do not establish ordinary global gene silencing; damage-signaling mechanism competes with direct repression.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[46] The NSL complex maintains nuclear architecture stability via lamin A/C acetylation.

Shows: MOF/NSL loss alters lamin acetylation and nuclear stability; HDAC inhibition or acetylation mimic rescues abnormal architecture.

Does not show: Broad chromatin/architecture effects and ectopic rescue; transcription loss in nuclear abnormalities may reflect global damage. Linked 2019 correction details not audited.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. Erratum In: PMID36849559. Subclaims: SC2, SC3.

[47] SIRT7 mediates L1 elements transcriptional repression and their association with the nuclear lamina.

Shows: SIRT7 depletion increases L1 expression/retrotransposition and H3K18 acetylation with impaired lamin association.

Does not show: L1 repeat subset and enzyme-to-anchoring direction; selective recruitment-defective interaction rescue is needed to establish lamina-dependent repression rather than parallel effects.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[48] Lamin A safeguards the m6 A methylase METTL14 nuclear speckle reservoir to prevent cellular senescence.

Shows: LaminA deficiency destabilizes speckle METTL3/14 reservoir and METTL14 overexpression reduces senescence markers.

Does not show: RNA methylation reservoir and senescence models are not direct LAD silencing or organismal healthspan; overexpression/markers retain caps.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[49] Identification of Genes and Pathways Regulated by Lamin A in Heart.

Shows: Lmna-null heart transcriptome alterations precede dysfunction and AAV-lamin rescue restores many genes with improved function/survival.

Does not show: Whole-protein rescue restores mechanics and transcription together; upstream regulator inference does not demonstrate direct peripheral silencer recruitment.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[50] Lamin-Related Congenital Muscular Dystrophy Alters Mechanical Signaling and Skeletal Muscle Growth.

Shows: LMNA-CMD mutations impair strain/YAP response and muscle growth with functional overload; related EDMD models differ.

Does not show: Disease allele/lineage and mechanics specificity map context, not a global transcriptionally repressive lamina role.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[51] Lamin A/C mediates microglial activation by modulating cell proliferation and immune response.

Shows: Lmna loss suppresses stimulated microglial proliferation/activation with proteomic and immune changes.

Does not show: Proliferation and response-state differences may mediate RNA/protein output; mechanotransduction is proposed, not selectively proved.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[52] Lamin A/C deficiency in CD4+ T-cells enhances regulatory T-cells and prevents inflammatory bowel disease.

Shows: T-cell Lmna loss shifts Treg/Th1 differentiation and lessens adoptive-transfer colitis with TF chromatin changes.

Does not show: Forced recipient model tests transferred cells, not spontaneous disease; lineage and RA environment matter and no global LAD mechanism is isolated.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[53] The nuclear envelope protein Net39 is essential for muscle nuclear integrity and chromatin organization.

Shows: Net39 knockout causes muscle nuclear defects, altered chromatin/transcription and lethal myopathy.

Does not show: Severe structural failure/global illness and a membrane tether distinct from lamin filaments limit direct transcription-specific inference.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[54] The LINC complex contributes to heterochromatin organisation and transcriptional gene silencing in plants.

Shows: Plant LINC mutants alter peripheral heterochromatin position/compaction and repeat silencing.

Does not show: Plants lack canonical metazoan lamin filaments; evidence supports an envelope architecture principle, not mammalian lamin-specific necessity.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[55] Unique and shared functions of nuclear lamina LEM domain proteins in Drosophila.

Shows: Drosophila LEM proteins show redundant viability effects but different tissue-specific defects and rescue capacities.

Does not show: Broad essentiality and ectopic rescue distinguish network redundancy, not all-domain transcriptional repression.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC4.

[56] Laminopathies disrupt epigenomic developmental programs and cell fate.

Shows: LMNA-mutant DamID and patient samples show altered developmental LAD transitions and persistent Sox2; Sox2 overexpression impairs differentiation.

Does not show: Mutant fusion and overexpression plus patient associations do not selectively test lamin tethering versus other nuclear functions.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3.

[57] Effects of chromatin-lamina attachment on extra-long-range chromatin interactions.

Shows: Polymer models incorporating LAD maps reproduce radial distributions and predict extra-long contacts.

Does not show: Simulated tethering is not an endogenous perturbation or independent functional transcription test; earlier preprint excluded.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. Update Of: PMID40027763. Subclaims: SC2, SC4.

[58] Expansion in situ genome sequencing links nuclear abnormalities to aberrant chromatin regulation.

Shows: ExIGS relates local lamin abnormalities in progeria cells to chromatin/transcriptional hotspots.

Does not show: Spatial association and a disease background do not establish causal direction or broad repression; preprint excluded.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. Update Of: PMID39386718. Subclaims: SC1, SC2, SC4.

[59] Suv39h-catalyzed H3K9me3 is critical for euchromatic genome organization and the maintenance of gene transcription.

Shows: Suv39 double-knockout reduces expression of peripheral euchromatic genes with changed 3D organization, despite heterochromatin-loss expectation.

Does not show: Histone-enzyme loss affects compaction and topology; functional direction is not simple repression release, and lamina mediation is inferred rather than selectively rescued.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

[60] B-type lamins maintain transcriptional homeostasis by spatially controlling chromatin-speckle proximity.

Shows: Original H1299B-lamin CRISPR knockouts reduce nascent RNA and correlate non-LAD speckle-distance shifts with RNA changes, alongside higher apoptosis and lower proliferation.

Does not show: Chronic whole-protein loss, cell death and correlations do not isolate a speckle-distance mediator; this is not an acute endogenous degron or selective silencer-recruitment test.

Access/status: Bounded original primary abstract Results/Findings/conclusion passages and linked-status metadata examined; no complete-abstract audit asserted. Selected body sections: 1:Materials and methods:paragraph0, 1:Materials and methods:paragraph1, 2:Results:paragraph0, 2:Results:paragraph5, 2:Results:paragraph31, 2:Results:paragraph32. No complete-paper or supplement audit claimed. none_found. Subclaims: SC2, SC3, SC4.

Documentary record

Every grade on this site is reproducible from its record. The files below are the posted edition exactly as assessed.

• ADVERSARIAL_REVIEW.md
• CONSENSUS_CROSSCHECK.html
• CONSENSUS_CROSSCHECK.md
• RESEARCH_TIMELINE.html
• RESEARCH_TIMELINE.md
• SHA256.txt
• adversarial-findings.json
• codex-correction-provenance.json
• consensus-validation.json
• edition-approval-audit.json
• nuclear-lamina.review.md
• nuclear-lamina.scorecard.json
• reader-summary.json
• research-timeline.json
• validation-report.json
• validation-round2-2026-10-14.json
• validation.txt
• video-insert.md
• web-page.md

Sources: 60 · load-bearing claims: 65 · verified: 65 · unverified: 0 · contradicted: 0 · schema 5.3