This gene encodes a member of the polycystin protein family. The encoded protein is a multi-pass membrane protein that functions as a calcium permeable cation channel, and is involved in calcium transport and calcium signaling in renal epithelial cells. This protein interacts with polycystin 1, and they may be partners in a common signaling cascade involved in tubular morphogenesis. Mutations in this gene are associated with autosomal dominant polycystic kidney disease type 2. Protein Interaction Partner: MAGEA8, PLSCR1, KRTAP10-3, KRTAP10-8, KRT40, PKD1, GOLGA2, CANX, ATP1A1, UBC, PACS2, HAX1, TRPC1, TNNI3, PACS1, CD2AP, DIAPH1, TPM1, PKD2, ACTN2, Protein Size: 646