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Eur J Clin Pharmacol. 2006 Jun;62(6):409-15. Epub 2006 Apr 21.

Frequencies of single nucleotide polymorphisms and haplotypes of organic anion transporting polypeptide 1B1 SLCO1B1 gene in a Finnish population.

Author information

1
Department of Clinical Pharmacology, University of Helsinki and Helsinki University Central Hospital, PO Box 340, Helsinki, 00029 HUS, Finland.

Abstract

OBJECTIVE:

Organic anion transporting polypeptide 1B1 (OATP1B1) is a drug uptake transporter located at the sinusoidal membrane of hepatocytes. Our aim was to establish high-throughput genotyping assays for the major known single nucleotide polymorphisms (SNP) in the SLCO1B1 gene encoding OATP1B1 and to investigate the frequencies of SNPs and haplotypes of SLCO1B1 in a large Caucasian population.

METHODS:

Distribution of SLCO1B1 alleles was determined in 468 healthy Finnish Caucasian subjects at 11 variant sites spanning the entire gene by using allelic discrimination with TaqMan 5' nuclease assays.

RESULTS:

The allelic frequencies of SLCO1B1 SNPs were 9.7% for g.-11187G>A, 0.4% for g.-11110T>G, 8.0% for g.-10499A>C, 46.2% for c.388A>G, 13.1% for c.411G>A, 13.1% for c.463C>A, 20.2% for c.521T>C, 53.2% for c.571T>C, 46.4% for c.597C>T, 4.0% for c.1929A>C and 48.8% for c.*439T>G. Altogether, 26 haplotypes were statistically inferred. The most common haplotype, with a frequency of 35.6%, contained variant allele C at position c.571, but had the reference nucleotide at all other positions investigated. The functionally significant c.521T>C SNP existed in four major haplotypes, which could be differentiated by the g.-11187G>A, g.-10499A>C and c.388A>G SNPs. The frequencies of these haplotypes were 7.9% for g.-11187G/g.-10499C/c.388G/c.521C (*16), 6.9% for AAGC (*17), 2.7% for GAAC (*5) and 2.4% for GAGC (*15).

CONCLUSION:

Sequence variations of SLCO1B1 occur at high frequencies in the Caucasian population. Further studies are needed to characterise the effects of SLCO1B1 haplotypes, especially *16, *17, *15 and *5, on drug pharmacokinetics and response, and to determine the frequencies of SLCO1B1 SNPs and haplotypes in different populations.

PMID:
16758257
DOI:
10.1007/s00228-006-0123-1
[Indexed for MEDLINE]

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