PSMA8 is a testis-specific proteasome 20S subunit alpha subunit that serves as a critical component of the spermatoproteasome complex. Its primary function is to promote acetylation-dependent degradation of core histones during spermatogenesis and meiotic DNA repair 1. PSMA8 is essential for proper spermatoproteasome assembly and function, enabling the proteasome to degrade acetylated histones independent of polyubiquitin conjugation 2. During meiosis, PSMA8 facilitates histone degradation at DNA damage loci in spermatocytes, enabling progression through metaphase I and completion of meiosis I 1. The protein interacts with NSD2, a histone methyltransferase, to regulate acetylated histone turnover during spermiogenesis and histone-to-protamine transition 3. Male fertility depends critically on PSMA8 function; its deletion arrests meiosis at the spermatocyte stage and causes male infertility 1. Beyond reproductive biology, PSMA8 variants have been implicated in disease susceptibility: rare coding variants were associated with colorectal cancer risk in a Swedish population 4, and PSMA8 was identified as part of a PANoptosis-related gene signature predicting ovarian cancer prognosis and immunotherapy response 5. Additionally, altered PSMA8 methylation patterns correlate with sperm DNA fragmentation 6.