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Description

Fibrocystin (UniProt P08F94, also known as Polycystic kidney and hepatic disease 1 protein, Polyductin, Tigmin, TIG multiple domains 1, Tigmin) is encoded by the PKHD1 (also known as ARPKD, FCYT, TIGM1) gene (Gene ID 5314) in human. Autosomal recessive polycystic kidney disease (ARPKD) is the most common cause of hereditary childhood PKD. ARPKD is caused by mutations in the gene PKHD1, which encodes fibrocystin/polyductin (FCP), while mutations in two other genes PKD1 and PKD2 that code polycystin-1 (PC1) and polycystin-2 (PC2), respectively, are the cause of autosomal dominant PKD (ADPKD). These three PKD proteins have been localized to renal primary cilia, where the PC1/PC2 complex acts as a flow sensor on the cilium. Fibrocystin is known to complex with PC2, but its biological role is unclear, While Uniprot (P08F94) documents two alternatively spliced human fibrocytin isoforms, multiple lines of evidence indicate that many more spliced mRNA transcripts exist and that aberrant mRNA splicing may represent a pathogenic mechanism in ARPKD in addition to gene mutations.