rs9934438
This is a regulatory region variant variant in the VKORC1 gene.
▶GWAS Catalog Trait Associations (1)
Genome-wide significant associations (p < 5×10⁻⁸) from the NHGRI-EBI GWAS Catalog.
GWAS Catalog Trait Associations (1)
Genome-wide significant associations (p < 5×10⁻⁸) from the NHGRI-EBI GWAS Catalog.
▶ClinVar annotation
Vitamin K-Dependent Clotting Factors; Warfarin response; acenocoumarol response - Dosage; not specified; phenprocoumon response - Dosage; warfarin response - Dosage
View on ClinVar →▶Research that mentions this SNP (2)
▶Brief Report: Single‐nucleotide polymorphisms in VKORC1 are risk factors for systemic lupus erythematosus in AsiansAssociationN=3,739Rachel Kaiser et al.(2013)· Arthritis & Rheumatism
Two SNPs in VKORC1 (rs9934438 and rs9923231) were identified as genetic risk factors for systemic lupus erythematosus (SLE) in Asian populations. In discovery cohort (263 SLE cases, 357 controls), both SNPs showed strong associations (OR=2.40-2.45, p=6.1×10^-9 to 2.4×10^-9), which were confirmed in a larger replication cohort (1496 cases, 993 controls) with OR=1.53-1.54 (p=4.3-5.1×10^-6), and remained significant after ancestry adjustment (OR=1.34, p=0.0029-0.0032).
▶Association of warfarin dose with genes involved in its action and metabolismAssociationN=201Mia Wadelius et al.(2007)· Human Genetics
An association study of 201 warfarin-treated patients found that polymorphisms in VKORC1, CYP2C9, CYP2C18, CYP2C19, PROC, and APOE were significantly associated with warfarin dose requirement (P < 0.000175 for VKORC1 and CYP2C9). A multiple regression model incorporating VKORC1, CYP2C9, PROC, and non-genetic factors (age, bodyweight, drug interactions, treatment indication) accounted for 62% of the variance in warfarin dose.
About VKORC1
This gene encodes the catalytic subunit of the vitamin K epoxide reductase complex, which is responsible for the reduction of inactive vitamin K 2,3-epoxide to active vitamin K in the endoplasmic reticulum membrane. Vitamin K is a required co-factor for carboxylation of glutamic acid residues by vitamin K-dependent gamma-carboxylase in blood-clotting enzymes. Allelic variation in this gene is associated with vitamin k-dependent clotting factors combined deficiency of 2, and increased resistance or sensitivity to warfarin, an inhibitor of vitamin K epoxide reductase. Pseudogenes of this gene are located on chromosomes 1 and X. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2015]
View all VKORC1 variants →Gene information from NCBI Gene. Variant classifications from ClinVar.
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