Three haplotypes associated with CYP2A6 phenotypes in Caucasians.

Abstract:

:The human cytochrome P450 2A6 (CYP2A6) enzyme metabolizes several xenobiotic compounds of clinical or toxicological importance. We aimed to identify genetic variants and major CYP2A6 haplotypes associated with CYP2A6 phenotypic variation. CYP2A6 mRNA level, protein level, activity and haplotypes were determined in Caucasian liver samples via real-time polymerase chain reaction, Western blot, coumarin 7-hydroxylation, DNA sequencing and genotyping, respectively. Phenotypes were then analyzed for associations with haplotypes. CYP2A6 transcript, protein and activity levels were correlated among each other. In 45 African-American, 156 Caucasian, 47 Chinese, 50 Japanese and 47 Korean DNA samples, we detected 95 different polymorphisms in the CYP2A6 gene, 49 of which had not been described previously. Caucasian variants formed 33 haplotypes which built four clades. Allele *9B and the CYP2A7/2A6 partial deletion allele CYP2A6*12B were both associated with decreased expression. The latter haplotype extends at least over 147 kb up into the CYP2B6 gene. A haplotype almost identical to allele *1A was associated with decreased expression and activity of CYP2A6 compared to all other haplotypes. In summary A CYP2A6*1A-like allele, *9B and *12B are major genetic determinants of CYP2A6 phenotype variation in Caucasians.

journal_name

Pharmacogenet Genomics

authors

Haberl M,Anwald B,Klein K,Weil R,Fuss C,Gepdiremen A,Zanger UM,Meyer UA,Wojnowski L

doi

10.1097/01.fpc.0000171517.22258.f1

keywords:

subject

Has Abstract

pub_date

2005-09-01 00:00:00

pages

609-24

issue

9

eissn

1744-6872

issn

1744-6880

pii

01213011-200509000-00002

journal_volume

15

pub_type

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