rs406658

This variant is located in the C4B gene.

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GWAS Catalog Trait Associations (5)

Genome-wide significant associations (p < 5×10⁻⁸) from the NHGRI-EBI GWAS Catalog.

complement C4 measurement

Pietzner M et al. “Mapping the proteo-genomic convergence of human diseases.” Science (new York, N.y.) 374(6569):eabj1541 (2021)
Allele A
OR 0.69
p 4.0e-218
N 10,708
Large GWAS
European
Sun BB et al. “Genomic atlas of the human plasma proteome.” Nature 558(7708):73-79 (2018)
Allele A
OR 0.56
p 3.0e-52
N 3,301
Large GWAS
European

level of protein AMBP in blood

Loya H et al. “A scalable variational inference approach for increased mixed-model association power.” Nature Genetics 57(2):461-468 (2025)
Allele A
OR 0.12
p 1.0e-51
N 47,745
Large GWAS
European

protein measurement

Pietzner M et al. “Mapping the proteo-genomic convergence of human diseases.” Science (new York, N.y.) 374(6569):eabj1541 (2021)
Allele A
OR 0.20
p 2.0e-18
N 10,708
Large GWAS
European

reticulocyte count

Vuckovic D et al. “The Polygenic and Monogenic Basis of Blood Traits and Diseases.” Cell 182(5):1214-1231.e11 (2020)
Allele A
OR 0.02
p 2.0e-10
N 408,112
Large GWAS
European

blood protein amount

Gudjonsson A et al. “A genome-wide association study of serum proteins reveals shared loci with common diseases.” Nature Communications 13(1):480 (2022)
Allele A
OR 0.22
p 5.0e-14
N 5,363
Large GWAS
European
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ClinVar annotation

Benign★☆☆☆
1 submitter1 publication

not specified

View on ClinVar →

About C4B

This gene encodes the basic form of complement factor 4, and together with the C4A gene, is 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, May 2020]

View all C4B variants →

Gene information from NCBI Gene. Variant classifications from ClinVar.

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