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Polymorphisms and Linkage Disequilibrium of the OATP8 (OATP1B3) Gene in Japanese Subjects

2006; Elsevier BV; Volume: 21; Issue: 2 Linguagem: Inglês

10.2133/dmpk.21.165

1880-0920

Masayuki Tsujimoto, Sumío Hirata, Yukihiko Dan, Hisakazu Ohtani, Yasufumi Sawada,

Pharmacogenetics and Drug Metabolism

OATP8, a member of the organic anion-transporting polypeptide family, is expressed on the sinusoidal membrane of hepatocytes, and transports endogenous organic anions, such as 17β-glucuronosyl estradiol, and xenobiotic substances, such as digoxin. The objective of this study is to search for polymorphisms of the OATP8 gene and to assess the allele frequency of the polymorphisms in the Japanese population. Analysis of the OATP8 gene in 79 subjects revealed complete linkage of two deletion polymorphisms in the 5′ regulatory region, deletion from position − 28 to − 11 and deletion from position − 7 to − 4, with an allele frequency of 0.196 for the deletion allele. The polymorphisms T334G (Ser112Ala) and G699A (Met233Ile) were also shown to be in complete linkage disequilibrium, with an allele frequency of 0.728 for the variant (112Ala/233Ile) allele. Interestingly, linkage disequilibrium was identified between the ins/del polymorphism and SNPs at 112 and 233. The predicted major haplotype was the insertvariant type with a haplotype frequency of 0.60.