Phenotype

Transcriptome

Biology

Gene

Embryonic stem cell

Gene expression

SOX2

KLF4

Cell biology

Epigenetics

Senescence

Genetics

Reprogramming

Nature Aging

Partial reprogramming by expression of reprogramming factors (Oct4, Sox2, Klf4 and c-Myc) for short periods of time restores a youthful epigenetic signature to aging cells and extends the life span of a premature aging mouse model. However, the effects of longer-term partial reprogramming in physiologically aging wild-type mice are unknown. Here, we performed various long-term partial reprogramming regimens, including different onset timings, during physiological aging. Long-term partial reprogramming lead to rejuvenating effects in different tissues, such as the kidney and skin, and at the organismal level; duration of the treatment determined the extent of the beneficial effects. The rejuvenating effects were associated with a reversion of the epigenetic clock and metabolic and transcriptomic changes, including reduced expression of genes involved in the inflammation, senescence and stress response pathways. Overall, our observations indicate that partial reprogramming protocols can be designed to be safe and effective in preventing age-related physiological changes. We further conclude that longer-term partial reprogramming regimens are more effective in delaying aging phenotypes than short-term reprogramming. In vivo partial reprogramming by expression of Oct4, Sox2, Klf4 and c-Myc has been shown to have rejuvenating effects in a mouse model of premature aging. Here, the authors report that longer-term partial reprogramming regimens are safe and effective in delaying age-related changes in physiologically aged mice.

In vivo partial reprogramming alters age-associated molecular changes during physiological aging in mice