Egg reserves decline faster in mice lacking a gene regulator
An experiment comparing genetically altered mice with normal mice at 2, 6 and 12 months linked faster depletion to low-grade inflammation.
Limit: Other effects of losing the gene were not separated from inflammation
Edited by Boris Djordjevic · AgingResearch.News
Female C57BL/6 mice lacking NF-κB1, a protein that regulates gene activity, lost ovarian egg reserves faster than normal littermates in an animal experiment. Researchers examined ovaries and blood at 2, 6 and 12 months of age.
At 2 months, both groups had similar numbers of primordial follicles, tiny sacs containing immature eggs. At 6 months, mice lacking the protein had fewer of these follicles and fewer follicles in the next stage of growth. By 12 months, both groups had very few of either type. Mice missing one copy of the gene for this protein also lost egg reserves early. Mice lacking the protein had higher inflammatory signals in blood and ovaries at 6 months. The researchers found no obvious ovarian scarring.
Why it matters
The age-related loss of immature eggs limits reproductive lifespan. This work bears on whether chronic low-grade inflammation contributes to that loss.
Caveats
The experiment did not separate inflammation from other effects of losing the gene, so it did not show that inflammation caused the faster depletion. The findings came from mice, not people.
The paper
Mice lacking NF-ĸB1 undergo premature ovarian aging
Monash University
Reproductive Biology and Endocrinology, Jun 25, 2026, Open access
