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Gene Protein Transcript Promoter Expression GO/PPI PubMed Cross reference

Gene information for C4A (Homo sapiens)
(Information is obtained from NCBI Gene database)
Entrez gene ID720
Official gene symbolC4A
Full namecomplement component 4A (Rodgers blood group)
Aliases,C4,C4A2,C4A3,C4A4,C4A6,C4S,CO4,CPAMD2,MGC164979,RG,
Gene summaryThis gene encodes the acidic form of complement factor 4, part of the classical activation pathway. The protein is expressed as a single chain precursor which is proteolytically cleaved into a trimer of alpha, beta, and gamma chains prior to secretion. The trimer provides a surface for interaction between the antigen-antibody complex and other complement components. The alpha chain may be cleaved to release C4 anaphylatoxin, a mediator of local inflammation. Deficiency of this protein is associated with systemic lupus erythematosus and type I diabetes mellitus. This gene localizes to the major histocompatibility complex (MHC) class III region on chromosome 6. Varying haplotypes of this gene cluster exist, such that individuals may have 1, 2, or 3 copies of this gene. [provided by RefSeq]
LocationChromosome: 6   Locus: 6p21.3
Gene position31949834 - 31970457  Map Viewer
Gene orientationplus
Gene size20624 bp
Gene sequence
OMIM ID120810