The potentially deleterious functional variant flavin-containing monooxygenase 2*1 is at high frequency throughout sub-Saharan Africa.
The potentially deleterious functional variant flavin-containing monooxygenase 2*1 is at high frequency throughout sub-Saharan Africa.
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DOI：
10.1097/fpc.0b013e3283097311
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发表时间：
2008-10
影响因子：
2.6
通讯作者：
Phillips IR
中科院分区：
文献类型：
--
作者：
Veeramah KR;Thomas MG;Weale ME;Zeitlyn D;Tarekegn A;Bekele E;Mendell NR;Shephard EA;Bradman N;Phillips IR
The drug-metabolizing enzyme flavin-containing monooxygenase 2 (FMO2) is the predominant FMO isoform present in the lung of most mammals, including non-human primates. All Europeans and Asians tested have been shown to be homozygous for a nonfunctional variant, FMO2*2A, which contains a premature stop codon due to a single-nucleotide change in exon 9 (g.23238C > T). The ancestral allele, FMO2*1, encodes a functionally active protein and has been found in African–Americans (26%) and Hispanics (2% to 7%). Possessing this variant increases the risk of pulmonary toxicity when exposed to thioureas, a widely used class of industrial compounds. FMO2 may also be involved in the metabolism of drugs that are used to treat diseases that are prevalent in Africa. We conducted a survey of g.23238C > T variation across Africa that revealed that the distribution of this SNP is relatively homogeneous across sub-Saharan Africa, with approximately one third of individuals possessing at least one FMO2*1 allele, though in some populations the incidence of these individuals approached 50%. Thus many sub-Saharan Africans may be at substantially increased health risk when encountering thiourea-containing substrates of FMO2. Analysis of HapMap data with the Long-Range Haplotype test found no evidence for positive selection of either 23238C > T allele and maximum-likelihood coalescent analysis indicated that this mutation occurred some 500,000 years before present. This study demonstrates the value of performing genetic surveys in Africa, a continent in which human genetic diversity is thought to be greatest, but where studies of the distribution of this diversity are few.
