CLDN19

CLDN19

A gene on chromosome 1p34.2 that encodes claudin-19, an integral membrane protein of the claudin family, and which plays a key role in tight junction-specific obliteration of the intercellular space by means of a calcium-independent mechanism.
Molecular pathology
CLDN19 mutations cause hypomagnesaemia renal with ocular involvement (HOMGO), a progressive nephropathy characterised by renal magnesium wasting with hypomagnesemia, hypercalciuria and nephrocalcinosis, and severe ocular defects (e.g., bilateral chorioretinal scars, macular colobomata, myopia and nystagmus).