Naked Mole Rat Cells Have a Stable Epigenome that Resists iPSC Reprogramming.
Level 5 - mechanism / opinion, no new human data
Bench research utilizing in vitro cell models and epigenetic profiling.
PubMed 29107597 · doi:10.1016/j.stemcr.2017.10.001
What was done
Researchers compared the induced pluripotent stem cell (iPSC) reprogramming efficiency of naked mole rat (NMR) fibroblasts to mouse fibroblasts following OSKM factor induction. They evaluated the effects of SV40 LargeT antigen (LT) expression as well as targeted inactivation of p53 or Rb on reprogramming efficiency. Additionally, they assessed global histone modifications (H3K27 methylation and acetylation) and performed ATAC-seq to measure chromatin accessibility at reprogramming gene promoters with and without LT expression.
What was found
The abstract reports no numerical values. Reprogramming efficiency of NMR fibroblasts was reported as drastically lower than that of mouse fibroblasts. SV40 LargeT expression dramatically improved NMR reprogramming, and inactivation of Rb alone—but not p53—was sufficient to increase efficiency. Epigenetic profiling showed NMR cells had higher repressive H3K27 methylation and lower activating H3K27 acetylation compared to mouse cells. ATAC-seq revealed NMR reprogramming gene promoters were more closed than mouse promoters, and LT expression induced massive promoter opening.
Why it matters
This study provides a mechanistic basis for the epigenetic stability of naked mole rat cells, suggesting that a closed chromatin state resistant to somatic de-differentiation may contribute to the species' cancer resistance and longevity.
Limits
The abstract provides no quantitative metrics, fold-changes, or sample sizes (n). The findings are restricted to in vitro fibroblast culture models and may not fully reflect in vivo tissue dynamics or multi-organ aging biology.
Cited by
- supports Long-lived animals such as whales and naked mole-rats have a very stable epigenome.