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Pharmacogenet Genomics. 2008 Mar;18(3):181-91. doi: 10.1097/FPC.0b013e3282f4dbdd.

Identification of a prevalent functional missense polymorphism in the UGT2B10 gene and its association with UGT2B10 inactivation against tobacco-specific nitrosamines.

Author information

1
Cancer Prevention and Control Program, Penn State Cancer Institute, Department of Public Health Sciences, Penn State University College of Medicine, Hershey, Pennsylvania 17033, USA.

Abstract

OBJECTIVE:

To study the potential association between UDP-glucuronosyltransferase (UGT)2B10 genotypes and [4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol] NNAL-N-glucuronidation activity in human liver microsomes (HLM) and to identify potential functional polymorphisms.

METHODS:

A total of 77 subjects were genotyped for three UGT2B10 tagging single nucleotide polymorphisms NNAL-N-glucuronidation activity in HLM was determined by high-pressure liquid chromatography and analyzed by UGT2B10 haplotypes.

RESULTS:

Four common UGT2B10 haplotypes (termed A through D) were identified. Haplotype C was found to be significantly (P<0.001) associated with lower NNAL-N-glucuronidation in HLM. A 1.8-fold and 12-fold reduction in NNAL-N-glucuronidation levels and a 1.7-fold and 11-fold reduction in the ratio of NNAL-N-Gluc: NNAL-O-Gluc, were observed in HLM from subjects with one and two copies of UGT2B10 haplotype C, respectively. A novel polymorphism resulting in an aspartic acid to tyrosine amino acid change at codon 67 of the UGT2B10 complementary DNA was identified exclusively in subjects with a haplotype C. Unlike the high activity observed in microsomes from HEK293 cells over expressing the wild-type UGT2B10(67Asp) variant, microsomes from HEK293 cells over expressing the UGT2B10(67Tyr) variant exhibited minimal glucuronide formation activity against NNAL or other tobacco-specific nitrosamines tested in vitro.

CONCLUSIONS:

The UGT2B10(67Tyr) variant corresponding to the UGT2B10 haplotype C is a functional single nucleotide polymorphism that may be responsible for inter individual variation in NNAL-N-glucuronidation activity and may increase susceptibility to smoking-related cancers.

PMID:
18300939
DOI:
10.1097/FPC.0b013e3282f4dbdd
[Indexed for MEDLINE]

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