1. A defunctioning polymorphism in FCGR2B is associated with protection against malaria but susceptibility to systemic lupus erythematosus.
- Author
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Willcocks LC, Carr EJ, Niederer HA, Rayner TF, Williams TN, Yang W, Scott JA, Urban BC, Peshu N, Vyse TJ, Lau YL, Lyons PA, and Smith KG
- Subjects
- Asian People genetics, Base Sequence, DNA Primers genetics, Genome-Wide Association Study, Genotype, Homozygote, Hong Kong, Humans, Molecular Sequence Data, Odds Ratio, Sequence Analysis, DNA, United Kingdom, White People genetics, Genetic Predisposition to Disease genetics, Lupus Erythematosus, Systemic genetics, Malaria genetics, Polymorphism, Single Nucleotide genetics, Receptors, IgG genetics
- Abstract
Systemic lupus erythematosus (SLE) is a multisystem autoimmune disease more prevalent in people of African and Asian origin than Caucasian origin. FcgammaRIIb is an inhibitory Fc receptor with a critical role in immune regulation. Mouse data suggest that FcgammaRIIb deficiency increases susceptibility to autoimmune disease but protects against infection. We show that a SNP in human FCGR2B that abrogates receptor function is strongly associated with susceptibility to SLE in both Caucasians and Southeast Asians. The minor allele of this SNP is more common in Southeast Asians and Africans, populations from areas where malaria is endemic, than in Caucasians. We show that homozygosity for the minor allele is associated with substantial protection against severe malaria in an East African population (odds ratio = 0.56; P = 7.1 x 10(-5)). This protective effect against malaria may contribute to the higher frequency of this SNP and hence, SLE in Africans and Southeast Asians.
- Published
- 2010
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