Gene Therapy Targeting a Mitochondrial Enzyme Slowed Ovarian Aging in Mice

The work, published in Nature Communications in 2026, is laboratory research in cells and mice. It includes no human data. The researchers did not study menopause. Any link to the human menopause transition is an open question.

The team first compared ovaries from young mice (3 months old) and aging mice (9 months old), with four animals in each group. They profiled gene activity in single cells: 5,974 cells from young ovaries and 4,928 from aging ones. They identified ten cell types. Aging ovaries had far fewer follicular granulosa cells, which support developing eggs. They also had many more immune cells, including phagocytes, B cells and T cells.

In the aging granulosa cells, energy-related activity was unusually high. Signals tied to inflammation and cell aging were up as well. Genes that change how DNA is packaged were also altered. Levels of acetyl-CoA, a molecule cells use both for energy and to mark DNA-packaging proteins, had built up. The ratio of NAD⁺ to NADH, a measure of the cell's energy chemistry, was lower. According to the authors, this fits cells compensating for weaker mitochondrial function.

One gene stood out. Suclg2 codes for an enzyme in the mitochondrial energy cycle. Its activity fell in aging granulosa cells, more than that of related genes.

The study then looked at a chemical tag called a succinyl group. An enzyme called SIRT5 removes these tags. Earlier research cited in the paper found that SIRT5 levels in ovarian follicle cells fall with maternal age. In this study, impaired SIRT5 activity emerged as a key driver of ovarian aging.

The researchers found that SIRT5 strips succinyl tags from the SUCLG2 enzyme at two sites, called K93 and K101. Removing the tags made the enzyme more stable and more active. That improved mitochondrial function in aging cells.

When those two sites carried too many tags, a different chain of events followed. Acetyl-CoA built up in the cell nucleus. A DNA-packaging mark called H4K8ac rose. Metabolism-related genes were switched on more strongly. The authors interpret this as a response to the energy shortfall caused by weaker mitochondria.

The experiments in living mice tested whether this pathway matters. According to the paper, giving mice an oversupply of acetyl-CoA accelerated ovarian aging. Ovarian gene therapy using a SUCLG2 version that cannot be tagged at those sites eased the aging.

The practical meaning is limited for now. The study suggests the SIRT5–SUCLG2 pathway is a possible target for age-related ovarian dysfunction, and the authors call it promising. It does not show that any treatment works in people. It also does not show that this pathway sets the timing of menopause.

What to watch next

What to watch next is whether other research groups reproduce the findings, and whether this pathway can be linked to ovarian aging in human tissue.

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