# Research timeline and gaps: RNA as Structural Scaffold in Nuclear Organization

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

**2009 — RNA depletion establishes defined paraspeckle architectural dependence.** [Original PMID19188602](https://pubmed.ncbi.nlm.nih.gov/19188602/).

**2011 — Mouse genetic loss removes local bodies with baseline tissue boundaries.** [Original PMID21444682](https://pubmed.ncbi.nlm.nih.gov/21444682/).

**2014 — Firre locus and protein perturbations test selected trans-site organization.** [Original PMID24463464](https://pubmed.ncbi.nlm.nih.gov/24463464/).

**2017 — SAF-A RNA-binding/oligomer rescue links structure to gene-rich chromatin.** [Original PMID28622508](https://pubmed.ncbi.nlm.nih.gov/28622508/).

**2018 — HNRNPU perturbation changes broader cellular genome architecture.** [Original PMID29273625](https://pubmed.ncbi.nlm.nih.gov/29273625/).

**2021 — Polymerase-retaining versus releasing inhibition tests euchromatin microphases.** [Original PMID33649325](https://pubmed.ncbi.nlm.nih.gov/33649325/).

**2021 — Repeat-rich RNA scaffold extraction and physical redistribution strengthen material hypotheses.** [Original PMID34320406](https://pubmed.ncbi.nlm.nih.gov/34320406/).

**2025 — Final SAP-domain study separates dynamic nuclear and XIST functions.** [Original PMID40493679](https://pubmed.ncbi.nlm.nih.gov/40493679/).

## Research gaps

Develop intact-cell RNA-selective structure perturbations that preserve polymerase attachment and RNA/protein chemistry.

Measure load-bearing rheology independently of RNA occupancy, chromatin marks or extraction insolubility.

Separate seconds/minutes structural responses from later splicing, replication stress and cell-cycle redistribution.

Map gene-density, compartment and developmental boundaries before outcomes rather than define scaffold-active responders.

Reconcile short polymerase-retaining inhibition with longer RNA depletion and cell-type-specific drug responses.

Test RNA rescue without restoring transcriptional work or the deleted DNA regulatory element.

Audit linked correction bodies and full supplements; unavailable public body is an access limitation, not a negative experiment.

## Boundary experiment

Prespecify several intact interphase cell states and gene-rich/poor compartments; reversibly disrupt nascent RNA material interactions without terminating polymerase or changing RNA-protein abundance, assay chromatin mechanics and compaction with orthogonal live methods, and rescue architecture with endogenous-level structural RNA while transcriptional work remains controlled.