Transient reprogramming rejuvenates fibroblasts ~30 years
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.
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Multi-omic rejuvenation of human cells by maturation phase transient reprogramming
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Transient reprogramming rejuvenates fibroblasts ~30 years
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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 )
What they did
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.
What they found
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.
The limits
What it doesn't show
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.
Key terms
- MPTR
- Maturation phase transient reprogramming—OSKM until rejuvenation point, then withdrawal.
- Yamanaka factors (OSKM)
- Oct4, Sox2, Klf4, c-Myc reprogramming cocktail.
- Aging clock
- Transcriptomic/epigenetic predictor of biological age.
- H3K9me3
- Heterochromatin-associated histone mark assessed for rejuvenation.
- Epigenetic memory
- Enhancer/persistent programs enabling regain of fibroblast identity.
- Maturation phase
- Mid-reprogramming stage where epigenome rejuvenation emerges before pluripotency.
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Common questions
What is MPTR?
Transient OSKM expression through maturation phase, then withdrawal before full reprogramming.
How much transcriptome rejuvenation?
Around 30 years by a novel transcriptome clock.
Do cells stay fibroblasts?
They temporarily lose then reacquire fibroblast identity.
Any functional gains?
Youthful collagen protein levels and partial migration-speed rejuvenation.
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