Declining centromere strength compromises meiotic chromosome segregation in aging oocytes.

Declining centromere strength in aged mouse oocytes is linked to increased chromosome segregation errors during meiosis I.

• Why it matters: Understanding the molecular basis of age-related aneuploidy in mammalian oocytes is crucial because maternal age is the primary risk factor for these errors, yet the mechanisms remain unclear.
• What they did: The study used ultrastructural analysis and molecular interventions to examine centromere components, revealing reduced CENP-A and CENP-C levels in aged oocytes and testing effects of CENP-A degradation and CENP-C rescue.
• The result: Findings show that centromere weakening contributes to meiotic errors and that restoring CENP-C partially improves chromosome alignment, highlighting centromere integrity as a target for mitigating age-related segregation defects.