This gene encodes a member of the claudin family. Claudins are integral membrane proteins and components of tight junction strands. Tight junction strands serve as a physical barrier to prevent solutes and water from passing freely through the paracellular space between epithelial or endothelial cell sheets, and also play critical roles in maintaining cell polarity and signal transductions. This protein is one of the entry cofactors for hepatitis C virus. Mouse studies revealed that this gene is required for the preservation of sensory cells in the hearing organ and the gene deficiency is associated with deafness. [provided by RefSeq, Jun 2010].
Fofana, Zona, Thumann, Heydmann, Durand, Lupberger, Blum, Pessaux, Gondeau, Reynolds, McKeating, Grunert, Thompson, Zeisel, Baumert: "Functional analysis of claudin-6 and claudin-9 as entry factors for hepatitis C virus infection of human hepatocytes by using monoclonal antibodies." in: Journal of virology, Vol. 87, Issue 18, pp. 10405-10, (2013) (PubMed).
Carrozzino, Pugnale, Féraille, Montesano: "Inhibition of basal p38 or JNK activity enhances epithelial barrier function through differential modulation of claudin expression." in: American journal of physiology. Cell physiology, Vol. 297, Issue 3, pp. C775-87, (2009) (PubMed).
Abuazza, Becker, Williams, Chakravarty, Truong, Lin, Baum: "Claudins 6, 9, and 13 are developmentally expressed renal tight junction proteins." in: American journal of physiology. Renal physiology, Vol. 291, Issue 6, pp. F1132-41, (2006) (PubMed).