PSMD6 is a non-ATPase subunit of the 26S proteasome complex, a critical cellular machinery responsible for ubiquitin-mediated protein degradation and homeostasis maintenance. As a component of the 19S regulatory particle, PSMD6 participates in essential cellular processes including cell cycle progression, apoptosis, and DNA damage repair 1. The gene demonstrates significant clinical relevance across multiple pathological contexts. In cancer, PSMD6 overexpression correlates with poor prognosis in pancreatic ductal adenocarcinoma, where high expression levels associate with reduced overall survival and relapse-free survival 2. The protein plays an oncogenic role in intrahepatic cholangiocarcinoma, being essential for cancer cell proliferation 1. Additionally, PSMD6 variants show association with type 2 diabetes susceptibility in East Asian populations 3 and influence therapeutic responses to antidiabetic medications 4. In developmental biology, PSMD6 is crucial for cardiac development, with loss-of-function mutations causing congenital heart defects in zebrafish models, including dysmorphic hearts and reduced outflow tracts 5. The gene also serves as a stable housekeeping gene in certain tissue contexts and shows potential as a biomarker for embryo quality assessment 6.