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Gene Protein Transcript Promoter Expression GO/PPI PubMed Cross reference

Gene information for C4B (Homo sapiens)
(Information is obtained from NCBI Gene database)
Entrez gene ID721
Official gene symbolC4B
Full namecomplement component 4B (Chido blood group)
Aliases,C4B1,C4B12,C4B2,C4B3,C4B5,C4F,CH,CO4,CPAMD3,FLJ60561,MGC164979,
Gene summaryThis gene encodes the basic 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. 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. In addition, this gene exists as a long form and a short form due to the presence or absence of a 6.4 kb endogenous HERV-K retrovirus in intron 9. [provided by RefSeq]
LocationChromosome: 6   Locus: 6p21.3
Gene position31982572 - 32003195  Map Viewer
Gene orientationplus
Gene size20624 bp
Gene sequence
OMIM ID120820