Epigenetics
Transient reprogramming rejuvenates fibroblasts ~30 years
Open access · cc by · source: Europe PMC
Maturation-phase transient OSKM expression (MPTR) rewinds transcriptome and epigenome aging clocks by ~30 years while cells reacquire fibroblast identity and youthful collagen/migration traits.
How this study connects
Role on claims
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A functional readout accompanies the clock change, which a clock shift alone would not establish.
Methylation age can be moved without losing cell identity. Transient reprogramming through a maturation phase left cells temporarily losing then regaining fibroblast identity via enhancer memory, with transcriptome and epigenome rejuvenated by roughly 30 years on methylation-clock and H3K9me3 measures, and the fibroblasts producing youthful collagen.
Evidence for the claim as stated.
What a methylation difference is taken to mean depends on the design that produced it. The ancestry study shows a population-level difference largely reducing to genotype, while the reprogramming study manipulates methylation directly and reads a functional consequence — so the two support very different inferences from the same kind of measurement.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
What a methylation difference is taken to mean depends on the design that produced it. The ancestry study shows a population-level difference largely reducing to genotype, while the reprogramming study manipulates methylation directly and reads a functional consequence — so the two support very different inferences from the same kind of measurement.
- Supports · Is ethnic DNA methylation just ancestry?
Inspect source passages
Transient reprogramming rejuvenates fibroblasts ~30 years
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Transcriptome rejuvenated by ~30 years
our method substantially rejuvenated multiple cellular attributes including the transcriptome, which was rejuvenated by around 30 years as measured by a novel transcriptome clock.
Three middle-aged donors aged 38, 53, and 53 years
fibroblasts from three middle-aged donors (chronologically aged 38, 53, and 53 years old and epigenetically aged 45, 49, and 55 years old, according to the multi-tissue epigenetic clock Horvath, 2013 )
Key findings
Cells temporarily lose then regain fibroblast identity (enhancer memory). Transcriptome rejuvenated ~30 years; epigenome similarly (H3K9me3; methylation clock). Effects exceeded prior transient protocols. Fibroblasts produced youthful collagen and partially recovered migration speed—showing rejuvenation can be separated from full pluripotency.
Methodology
Gill et al. developed MPTR: express Yamanaka factors until maturation-phase rejuvenation, then withdraw. Applied to dermal fibroblasts from three middle-aged donors (ages 38/53/53), targeting the day 10–17 window suggested by clock trajectories, then measured transcriptome clocks, DNA methylation clocks, H3K9me3, collagen, and migration.
Limitations
In vitro fibroblast results may not translate to safe in vivo rejuvenation. Donor n=3 is small; long-term genomic stability/tumor risk not fully settled.
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