Scientists at HHMI's Janelia Research Campus are C. elegans as a model to study reproductive aging, shedding light on the biological clock that influences fertility. Despite the apparent differences between humans and C. elegans, the worms share a similar reproductive lifespan, which spans one-third of their lives. This makes them an ideal model for investigating aging and fertility, explains Meng Wang, senior author on the study published in Developmental Cell.

Recent research from the team has identified a mitochondrial enzyme that governs reproductive health, a discovery with potential implications for understanding human reproductive aging.

Mitochondria, known as the cell's powerhouses, play a crucial role in reproduction, particularly in oocytes (unfertilized eggs). However, the precise mechanisms by which mitochondria impact reproductive aging remain poorly understood.

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The study found that a variant of the enzyme Mitochondrial Succinyl-CoA Synthetase, which produces the energy molecule GTP, increases in oocytes as they age. Reducing the levels of this enzyme, known as GTP-specific SCS, extended the reproductive period in C. elegans and enhanced the fertilization potential of older eggs.

Furthermore, the researchers observed that mitochondria in aging oocytes cluster around the cell's nucleus, a process regulated by GTP-specific SCS. Inhibiting GTP production prevented this clustering, more than doubling the worms' reproductive lifespan.

Additionally, the study revealed that age-related changes in oocyte mitochondria were influenced by exposure to different strains of E. coli bacteria. Vitamin B12 produced by these bacteria regulated GTP levels in mitochondria, affecting mitochondrial clustering, and consequently, reproductive aging.

These findings not only provide insights into the regulation of reproductive aging in mammals, including humans, but also highlight how genetic and environmental factors can impact the duration of a woman's reproductive capability and the health of her pregnancies.