Oocyte-specific protein that localizes to centromeres at the dictyate stage and regulates the survival of primordial oocytes. Localized to the synaptonemal complex lateral elements in late diplotene oocytes, while it is absent on the synaptonemal complex of leptotene, zygotene, pachytene and early diplotene oocytes (PubMed:26362258). Localizes to centromeres in dictyate oocytes (PubMed:26362258). Detected in nuclear granules and sizable aggregates (By similarity). Specifically expressed in oocytes. Reduced fertility in females: acceleration of the age-associated decline of fertility in female mice, due to progressive loss of oocytes. Males are normal and fertile. Belongs to the SYCP2 family.