Genetic Variations and Frequencies of Major Haplotypes in SLCO1B1 Encoding the Transporter OATP1B1 in Japanese Subjects: SLCO1B117 is More Prevalent Than 15

• Published in: DRUG METABOLISM AND PHARMACOKINETICS Vol. 22; no. 6; pp. 456 - 461
• Main Authors: Kim, Su-Ryang, Saito, Yoshiro, Sai, Kimie, Kurose, Kouichi, Maekawa, Keiko, Kaniwa, Nahoko, Ozawa, Shogo, Kamatani, Naoyuki, Shirao, Kuniaki, Yamamoto, Noboru, Hamaguchi, Tetsuya, Kunitoh, Hideo, Ohe, Yuichiro, Yamada, Yasuhide, Tamura, Tomohide, Yoshida, Teruhiko, Minami, Hironobu, Ohtsu, Atsushi, Saijo, Nagahiro, Sawada, Jun-ichi
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 2007; Japanese Society for the Study of Xenobiotics
• Subjects: 5' Flanking Region; 5' Untranslated Regions; amino acid change; Asian Continental Ancestry Group - genetics; Base Sequence; Codon, Terminator; direct sequencing; DNA Mutational Analysis; Exons; Gene Frequency; Haplotypes; Heterozygote; Humans; Introns; Japan; Molecular Sequence Data; novel genetic variation; Organic Anion Transporters - genetics; Organic Anion Transporters - metabolism; Pharmaceutical Preparations - metabolism; Phenotype; Polymorphism, Single Nucleotide; SLCO1B1; Solute Carrier Organic Anion Transporter Family Member 1b1; SLCO1B1; novel genetic variation; direct sequencing; amino acid change
• ISSN: 1347-4367; 1880-0920
• DOI: 10.2133/dmpk.22.456

A liver-specific transporter organic anion transporting polypeptide 1B1 (OATP1B1, also known as OATP-C) is encoded by SLCO1B1 and mediates uptake of various endogenous and exogenous compounds from blood into hepatocytes. In this study, 15 SLCO1B1 exons (including non-coding exon 1) and their flanking introns were comprehensively screened for genetic variations in 177 Japanese subjects. Sixty-two genetic variations, including 28 novel ones, were found: 7 in the 5'-flanking region, 1 in the 5'-untranslated region (UTR), 13 in the coding exons (9 nonsynonymous and 4 synonymous variations), 5 in the 3'-UTR, and 36 in the introns. Five novel nonsynonymous variations, 311T>A (Met104Lys), 509T>C (Met170Thr), 601A>G (Lys201Glu), 1553C>T (Ser518Leu), and 1738C>T (Arg580Stop), were found as heterozygotes. The allele frequencies were 0.008 for 1738C>T (Arg580Stop) and 0.003 for the four other variations. Arg580Stop having a stop codon at codon 580 results in loss of half of transmembrane domain (TMD) 11, TMD12, and a cytoplasmic tail, which might affect transport activity. In addition, novel variations, IVS12-1G>T at the splice acceptor site and -3A> C in the Kozak motif, were detected at 0.003 and 0.014 frequencies, respectively. Haplotype analysis using -11187G>A, -3A>C, IVS12-1G>T and 9 nonsynonymous variations revealed that the haplotype frequencies for *1b, *5, *15, and *17 were 0.469, 0.000 (not detected), 0.037, and 0.133, respectively. These data would provide fundamental and useful information for pharmacogenetic studies on OATP1B1-transported drugs in Japanese.