CRYGB (crystallin gamma B) is a structural protein and a dominant component of the vertebrate eye lens [UniProt]. It is essential for lens development and maintains visual perception through its role as a structural constituent of the eye lens [GO Annotations]. At the molecular level, CRYGB functions through protein binding interactions critical for lens architecture and clarity [GO Annotations]. Mutations in CRYGB cause cataract formation by disrupting normal lens fiber cell differentiation and protein organization. The Cat2nop mouse model demonstrates that mutations in the third exon of Crygb produce truncated gamma B-crystallin, terminating lens fiber cell differentiation and causing cataracts 1. Additionally, high-throughput transcriptomic analysis identified CRYGB among key genes mis-expressed in cataract pathogenesis, indicating its critical role in lens biology 2. CRYGB mutations are associated with Cataract 39 and multiple cataract types in humans, dogs, and mice [NCBI Summary]. In canine models, polymorphisms in CRYGB were investigated as potential causative variants in hereditary cataracts in dachshunds, though specific polymorphisms were excluded as primary causes in that breed 3. The Cat2 mouse mutations near gamma-crystallin genes provide valuable translational models for understanding human CRYG-related cataracts at chromosome 2-35 1. These findings establish CRYGB as a critical lens structural protein whose dysfunction causes congenital and juvenile cataracts, making it clinically significant for ocular disease understanding and potential therapeutic intervention.