Aliases for CLDN1 Gene
External Ids for CLDN1 Gene
Previous GeneCards Identifiers for CLDN1 Gene
Tight junctions represent one mode of cell-to-cell adhesion in epithelial or endothelial cell sheets, forming continuous seals around cells and serving as a physical barrier to prevent solutes and water from passing freely through the paracellular space. These junctions are comprised of sets of continuous networking strands in the outwardly facing cytoplasmic leaflet, with complementary grooves in the inwardly facing extracytoplasmic leaflet. The protein encoded by this gene, a member of the claudin family, is an integral membrane protein and a component of tight junction strands. Loss of function mutations result in neonatal ichthyosis-sclerosing cholangitis syndrome. [provided by RefSeq, Jul 2008]
GeneCards Summary for CLDN1 Gene
CLDN1 (Claudin 1) is a Protein Coding gene. Diseases associated with CLDN1 include Ichthyosis, Leukocyte Vacuoles, Alopecia, And Sclerosing Cholangitis and Sclerosing Cholangitis. Among its related pathways are Blood-Brain Barrier and Immune Cell Transmigration: Pathways Overview and Cell junction organization. Gene Ontology (GO) annotations related to this gene include identical protein binding and structural molecule activity. An important paralog of this gene is CLDN7.
UniProtKB/Swiss-Prot Summary for CLDN1 Gene
Claudins function as major constituents of the tight junction complexes that regulate the permeability of epithelia. While some claudin family members play essential roles in the formation of impermeable barriers, others mediate the permeability to ions and small molecules. Often, several claudin family members are coexpressed and interact with each other, and this determines the overall permeability. CLDN1 is required to prevent the paracellular diffusion of small molecules through tight junctions in the epidermis and is required for the normal barrier function of the skin. Required for normal water homeostasis and to prevent excessive water loss through the skin, probably via an indirect effect on the expression levels of other proteins, since CLDN1 itself seems to be dispensable for water barrier formation in keratinocyte tight junctions (PubMed:23407391).
(Microbial infection) Acts as a co-receptor for hepatitis C virus (HCV) in hepatocytes (PubMed:17325668, PubMed:20375010, PubMed:24038151). Associates with CD81 and the CLDN1-CD81 receptor complex is essential for HCV entry into host cell (PubMed:20375010). Acts as a receptor for dengue virus (PubMed:24074594).