Type: Term Definitions: 1. Notation for collagen type IV α-5 gene.
COL4A5: The gene for basement membrane type IV collagen alpha-5 chain. COL4A5 is on the X chromosome in band Xq22.3. Mutations in COL4A5 are responsible for the X-linked form of Alport syndrome, a type of hereditary kidney disease. Also known as Collagen IV alpha 5; Collagen, type IV, alpha 5.