HERC2 (HECT And RLD Domain Containing E3 Ubiquitin Protein Ligase 2): HERC2 is an E3 ubiquitin-protein ligase that plays a key role in the ubiquitin–proteasome system, which regulates protein degradation. It is involved in diverse cellular processes, including DNA repair and pigment production, particularly in determining eye color. Variations in HERC2 are linked to neurodevelopmental disorders and pigmentary anomalies.