Aliases for COL18A1 Gene
External Ids for COL18A1 Gene
Previous HGNC Symbols for COL18A1 Gene
Previous GeneCards Identifiers for COL18A1 Gene
This gene encodes the alpha chain of type XVIII collagen. This collagen is one of the multiplexins, extracellular matrix proteins that contain multiple triple-helix domains (collagenous domains) interrupted by non-collagenous domains. A long isoform of the protein has an N-terminal domain that is homologous to the extracellular part of frizzled receptors. Proteolytic processing at several endogenous cleavage sites in the C-terminal domain results in production of endostatin, a potent antiangiogenic protein that is able to inhibit angiogenesis and tumor growth. Mutations in this gene are associated with Knobloch syndrome. The main features of this syndrome involve retinal abnormalities, so type XVIII collagen may play an important role in retinal structure and in neural tube closure. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2014]
GeneCards Summary for COL18A1 Gene
COL18A1 (Collagen Type XVIII Alpha 1 Chain) is a Protein Coding gene. Diseases associated with COL18A1 include Knobloch Syndrome 1 and Glaucoma, Primary Closed-Angle. Among its related pathways are Collagen chain trimerization and Integrin Pathway. Gene Ontology (GO) annotations related to this gene include identical protein binding and structural molecule activity. An important paralog of this gene is COL4A5.
UniProtKB/Swiss-Prot Summary for COL18A1 Gene
Probably plays a major role in determining the retinal structure as well as in the closure of the neural tube.
[Non-collagenous domain 1]: May regulate extracellular matrix-dependent motility and morphogenesis of endothelial and non-endothelial cells; the function requires homotrimerization and implicates MAPK signaling.
[Endostatin]: Potently inhibits endothelial cell proliferation and angiogenesis (PubMed:9459295). May inhibit angiogenesis by binding to the heparan sulfate proteoglycans involved in growth factor signaling (By similarity). Inhibits VEGFA-induced endothelial cell proliferation and migration. Seems to inhibit VEGFA-mediated signaling by blocking the interaction of VEGFA to its receptor KDR/VEGFR2. Modulates endothelial cell migration in an integrin-dependent manner implicating integrin ITGA5:ITGB1 and to a lesser extent ITGAV:ITGB3 and ITGAV:ITGB5 (By similarity). May negatively regulate the activity of homotrimeric non-collagenous domain 1 (PubMed:11257123).