COPS9 (COP9 Signalosome Subunit 9): COPS9 is a gene that encodes a protein part of the COP9 signalosome, a complex involved in regulating protein degradation. This complex plays key roles in cell cycle control, signal transduction, and DNA repair by modulating the ubiquitin-proteasome system, which affects protein stability. COPS9’s function in this complex highlights its importance in maintaining cellular balance and its potential impact on disease when these processes are disrupted.