Tight junction group of proteins are a cell-to-cell adhesion structure in epithelial cells that constitute the epithelial junctional complex with adherens junctions and desmosomes. Tight junction strands are mainly composed of claudins, occludin, and JAM. Claudin-16 belongs to the Claudin family of protein which is composed of 23 integral membrane proteins. Claudins are responsible for the formation of tight junction strands and are connected with the actin cytoskeleton mediated by ZO-1. Claudin 16, also known as Paracellin-1, is a renal tight junction protein required for paracellular magnesium resorption. It is localized in the intercellular junctions of the epithelial cells of the thick ascending limb of Henle's loop (a TAL marker) are used to localize this specific structure of nephrons in kidney sections. Mg2+ resorption occurs in TAL, and Claudin-16 is required for this paracellular function. Failure in renal 'handling' of magnesium can result in hypermagnesemia, whose major direct toxicity implications are cardiovascular as well as renal failure. Recent studies have shown that the lack of Claudin-16 proteins contributes to the dysfunction of paracellular renal transport systems.
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Protein Aliases: Claudin-16; hypomagnesemia 3, with hypercalciuria and nephrocalcinosis; Paracellin-1; PCLN-1
Gene Aliases: CLDN16; HOMG3; PCLN1
UniProt ID: (Human) Q9Y5I7
Entrez Gene ID: (Human) 10686
Molecular Function: tight junction