{
  "cutoff": "2026-10-13",
  "note": "Selected publication milestones, not an exhaustive history or discovery priority claim.",
  "milestones": [
    {
      "pmid": "22056670",
      "year": "2011",
      "title": "Rejuvenating senescent and centenarian human cells by reprogramming through the pluripotent state.",
      "doi": "10.1101/gad.173922.111",
      "url": "https://pubmed.ncbi.nlm.nih.gov/22056670/",
      "interpretation": "Full pluripotent reprogramming resets aged-human-cell traits but entails identity loss and redifferentiation."
    },
    {
      "pmid": "24025773",
      "year": "2013",
      "title": "Reprogramming in vivo produces teratomas and iPS cells with totipotency features.",
      "doi": "10.1038/nature12586",
      "url": "https://pubmed.ncbi.nlm.nih.gov/24025773/",
      "interpretation": "In vivo factor induction demonstrates pluripotency and multi-organ teratoma hazards."
    },
    {
      "pmid": "27884981",
      "year": "2016",
      "title": "Tissue damage and senescence provide critical signals for cellular reprogramming in vivo.",
      "doi": "10.1126/science.aaf4445",
      "url": "https://pubmed.ncbi.nlm.nih.gov/27884981/",
      "interpretation": "Senescence and IL6 create a permissive mouse tissue state for reprogramming."
    },
    {
      "pmid": "27984723",
      "year": "2016",
      "title": "In Vivo Amelioration of Age-Associated Hallmarks by Partial Reprogramming.",
      "doi": "10.1016/j.cell.2016.11.052",
      "url": "https://pubmed.ncbi.nlm.nih.gov/27984723/",
      "interpretation": "Cyclic partial factors improve progeroid survival and selected old-wild-type recovery outcomes."
    },
    {
      "pmid": "29985406",
      "year": "2018",
      "title": "AAVvector-mediated in vivo reprogramming into pluripotency.",
      "doi": "10.1038/s41467-018-05059-x",
      "url": "https://pubmed.ncbi.nlm.nih.gov/29985406/",
      "interpretation": "AAV delivery achieves full reprogramming and teratomas even without c-Myc in a specific setting."
    },
    {
      "pmid": "29676998",
      "year": "2018",
      "title": "An epigenetic biomarker of aging for lifespan and healthspan.",
      "doi": "10.18632/aging.101414",
      "url": "https://pubmed.ncbi.nlm.nih.gov/29676998/",
      "interpretation": "PhenoAge develops clinical-risk prediction, which is distinct from intervention surrogate validation."
    },
    {
      "pmid": "32210226",
      "year": "2020",
      "title": "Transient non-integrative expression of nuclear reprogramming factors promotes multifaceted amelioration of aging in human cells.",
      "doi": "10.1038/s41467-020-15174-3",
      "url": "https://pubmed.ncbi.nlm.nih.gov/32210226/",
      "interpretation": "Transient human-cell mRNAs improve cellular measures and graft function in mouse recipients."
    },
    {
      "pmid": "33268865",
      "year": "2020",
      "title": "Reprogramming to recover youthful epigenetic information and restore vision.",
      "doi": "10.1038/s41586-020-2975-4",
      "url": "https://pubmed.ncbi.nlm.nih.gov/33268865/",
      "interpretation": "Retinal OSK provides actual mouse vision benefit and TET/TDG dependence with demethylation alone insufficient."
    },
    {
      "pmid": "33844651",
      "year": "2021",
      "title": "Potential reversal of epigenetic age using a diet and lifestyle intervention: a pilot randomized clinical trial.",
      "doi": "10.18632/aging.202913",
      "url": "https://pubmed.ncbi.nlm.nih.gov/33844651/",
      "interpretation": "A short diet/lifestyle pilot shifts a clock without establishing partial reprogramming or clinical years regained."
    },
    {
      "pmid": "35235716",
      "year": "2022",
      "title": "Multi-omic rejuvenation of naturally aged tissues by a single cycle of transient reprogramming.",
      "doi": "10.1111/acel.13578",
      "url": "https://pubmed.ncbi.nlm.nih.gov/35235716/",
      "interpretation": "A single OSKM cycle resets mouse multiomics, retaining the marker-versus-function boundary."
    },
    {
      "pmid": "35390271",
      "year": "2022",
      "title": "Multi-omic rejuvenation of human cells by maturation phase transient reprogramming.",
      "doi": "10.7554/eLife.71624",
      "url": "https://pubmed.ncbi.nlm.nih.gov/35390271/",
      "interpretation": "Human fibroblasts regain identity after temporary suppression; migration varies independently of clock changes."
    },
    {
      "pmid": "35690067",
      "year": "2022",
      "title": "Diverse partial reprogramming strategies restore youthful gene expression and transiently suppress cell identity.",
      "doi": "10.1016/j.cels.2022.05.002",
      "url": "https://pubmed.ncbi.nlm.nih.gov/35690067/",
      "interpretation": "Factor-subset screens separate youthful expression from partly separable somatic-identity suppression."
    },
    {
      "pmid": "36287172",
      "year": "2022",
      "title": "Combining stem cell rejuvenation and senescence targeting to synergistically extend lifespan.",
      "doi": "10.18632/aging.204347",
      "url": "https://pubmed.ncbi.nlm.nih.gov/36287172/",
      "interpretation": "Fly cyclic-versus-continuous expression maps survival benefit and regimen-dependent harms."
    },
    {
      "pmid": "36277076",
      "year": "2022",
      "title": "A computational solution for bolstering reliability of epigenetic clocks: Implications for clinical trials and longitudinal tracking.",
      "doi": "10.1038/s43587-022-00248-2",
      "url": "https://pubmed.ncbi.nlm.nih.gov/36277076/",
      "interpretation": "Technical clock-replicate noise motivates more reliable measurement without supplying clinical surrogacy."
    },
    {
      "pmid": "36638792",
      "year": "2023",
      "title": "Loss of epigenetic information as a cause of mammalian aging.",
      "doi": "10.1016/j.cell.2022.12.027",
      "url": "https://pubmed.ncbi.nlm.nih.gov/36638792/",
      "interpretation": "Induced epigenomic-change models give mechanistic aging leads, with an attached erratum and forced-injury limits."
    },
    {
      "pmid": "37437248",
      "year": "2023",
      "title": "Chemically induced reprogramming to reverse cellular aging.",
      "doi": "10.18632/aging.204896",
      "url": "https://pubmed.ncbi.nlm.nih.gov/37437248/",
      "interpretation": "Chemical cell cocktails reset selected transcript/compartment measures, providing cellular rather than human clinical evidence."
    },
    {
      "pmid": "38012287",
      "year": "2023",
      "title": "In vivo reprogramming leads to premature death linked to hepatic and intestinal failure.",
      "doi": "10.1038/s43587-023-00528-5",
      "url": "https://pubmed.ncbi.nlm.nih.gov/38012287/",
      "interpretation": "Continuous systemic induction causes organ dysfunction; organ exclusions attenuate mouse toxicity."
    },
    {
      "pmid": "38060815",
      "year": "2023",
      "title": "Sustained Vision Recovery by OSK Gene Therapy in a Mouse Model of Glaucoma.",
      "doi": "10.1089/cell.2023.0074",
      "url": "https://pubmed.ncbi.nlm.nih.gov/38060815/",
      "interpretation": "Retinal follow-up shows duration and withdrawal-dependent vision benefits within the same therapeutic platform."
    },
    {
      "pmid": "38381405",
      "year": "2024",
      "title": "Gene Therapy-Mediated Partial Reprogramming Extends Lifespan and Reverses Age-Related Changes in Aged Mice.",
      "doi": "10.1089/cell.2023.0072",
      "url": "https://pubmed.ncbi.nlm.nih.gov/38381405/",
      "interpretation": "Very-old male mouse remaining-life and frailty positives require buffer-control and survivor-selection interpretation."
    },
    {
      "pmid": "39095531",
      "year": "2024",
      "title": "Development of an epigenetic clock resistant to changes in immune cell composition.",
      "doi": "10.1038/s42003-024-06609-4",
      "url": "https://pubmed.ncbi.nlm.nih.gov/39095531/",
      "interpretation": "Immune composition is explicitly separated from cell-intrinsic clock change."
    },
    {
      "pmid": "39259812",
      "year": "2024",
      "title": "Targeted partial reprogramming of age-associated cell states improves markers of health in mouse models of aging.",
      "doi": "10.1126/scitranslmed.adg1777",
      "url": "https://pubmed.ncbi.nlm.nih.gov/39259812/",
      "interpretation": "Aged-cell-directed OSK expands mouse functional/survival and observed-tumor feasibility evidence."
    },
    {
      "pmid": "39684245",
      "year": "2024",
      "title": "Partial Reprogramming Exerts a Rejuvenating Effect on Human Mesenchymal Stem Cells That Underwent Replicative Senescence in Culture.",
      "doi": "10.3390/ijms252312533",
      "url": "https://pubmed.ncbi.nlm.nih.gov/39684245/",
      "interpretation": "Human cultured-MSC rejuvenation coexists with a viral-residue adverse assay."
    },
    {
      "pmid": "39037528",
      "year": "2025",
      "title": "Cognitive rejuvenation in old rats by hippocampal OSKM gene therapy.",
      "doi": "10.1007/s11357-024-01269-y",
      "url": "https://pubmed.ncbi.nlm.nih.gov/39037528/",
      "interpretation": "Old female rat cognition improves in a short neural gene-therapy context, with limited safety follow-up."
    },
    {
      "pmid": "40588563",
      "year": "2025",
      "title": "Chemical reprogramming ameliorates cellular hallmarks of aging and extends lifespan.",
      "doi": "10.1038/s44321-025-00265-9",
      "url": "https://pubmed.ncbi.nlm.nih.gov/40588563/",
      "interpretation": "Chemical reprogramming combines human-cell hallmarks with worm lifespan, preserving species separation."
    },
    {
      "pmid": "41672073",
      "year": "2026",
      "title": "Cognitive rejuvenation through partial reprogramming of engram cells.",
      "doi": "10.1016/j.neuron.2025.11.028",
      "url": "https://pubmed.ncbi.nlm.nih.gov/41672073/",
      "interpretation": "Engram-targeted OSK expands selected mouse cognitive contexts rather than human efficacy."
    },
    {
      "pmid": "42647204",
      "year": "2026",
      "title": "Conserved Partial Reprogramming Effects on the Methylome.",
      "doi": "10.3390/epigenomes10030055",
      "url": "https://pubmed.ncbi.nlm.nih.gov/42647204/",
      "interpretation": "Original public-dataset reanalysis identifies conserved CpGs without adding five new functional trials."
    }
  ],
  "gaps": [
    "Controlled durable adult-human clinical function rather than cell or animal transfer.",
    "Independent clock-to-function intervention-surrogate validation and separate safety prediction.",
    "Quantified exact-factor delivery/duration safety windows across relevant tissues and baseline diseases.",
    "Mechanism-specific rescue distinguishing epigenetic repair from selection, dedifferentiation, altered metabolism and injury-specific regeneration.",
    "Late-life versus developmental, sex, species and tissue generalization; remaining lifespan distinguished from total life.",
    "Complete supplements, source-overlap reconstruction and long-term safety beyond the selected body passages."
  ],
  "decisive_experiment": "A prospective exact-delivery adult-human trial measures independently masked objective clinical function and disease trajectory against a justified concurrent comparator, with prespecified exposure duration and full-recipient estimands. Analyze clock change independently of training/selection and test whether it predicts function beyond baseline factors. Use monitored dose/duration windows and long-term identity, inflammatory, delivery and tumor surveillance; no outcome-defined recipient exclusions."
}