The product of this gene belongs to the claudin family. It plays a major role in tight junction-specific obliteration of the intercellular space, through calcium-independent cell-adhesion activity. Defects in this gene are the cause of hypomagnesemia renal with ocular involvement (HOMGO). HOMGO is a progressive renal disease characterized by primary renal magnesium wasting with hypomagnesemia, hypercalciuria and nephrocalcinosis associated with severe ocular abnormalities such as bilateral chorioretinal scars, macular colobomata, significant myopia and nystagmus. Alternatively spliced transcript variants encoding distinct isoforms have been identified for this gene. [provided by RefSeq, Jun 2010]
Forensic Context
A study in rats demonstrated that the CLDN19 was upregulated in the plantaris muscle of hindlimb-unloaded animals, an effect mediated by the collaborative action of miR-182 and decreased miR-489-3p [Song et al. DOI:10.1097/BCR.0000000000000444].