期刊
PHARMACOGENETICS AND GENOMICS
卷 17, 期 9, 页码 743-753出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/FPC.0b013e3281111eb1
关键词
biomarkers; cancer; DNA repair; HPRT; MGMT; mutation; polymorphism; smoking
资金
- NATIONAL CENTER FOR RESEARCH RESOURCES [M01RR000073] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF ENVIRONMENTAL HEALTH SCIENCES [P30ES006676] Funding Source: NIH RePORTER
- NCRR NIH HHS [M01 RR-0073] Funding Source: Medline
- NIEHS NIH HHS [ES06676] Funding Source: Medline
- PHS HHS [T32-07454] Funding Source: Medline
Objectives O-6-methylguanine-DNA-methyltransferase (MGMT) is a crucial DNA repair protein that removes DNA adducts formed by alkylating mutagens. Several coding single nucleotide polymorphisms (cSNPs) in the MGMT gene have been reported. Their biological significance, however, is not known. Methods We used a newly modified cloning HPRT mutant lymphocyte assay to test the hypothesis that inheritance of the L84F and I143V coding single nucleotide polymorphism in the MGMT gene is associated with increases in HPRT mutant frequency in lymphocytes of individuals exposed to alkylating agents. In addition, we expanded and sequenced 109 mutant clones to test the hypothesis that the mutation spectrum would shift to a larger percentage of base substitutions and G-A transition mutations in cells with L84F and 1143 V coding single nucleotide polymorphisms. function of the 84F coding single nucleotide polymorphism and smoking, according to the model; mutant frequency (x 10(-5))=0.90 + 0.618 (84F polymorphism) + 0.46 (smoking) with R-2 =0.22. Mutation spectra analysis revealed an apparent increase, which was short of statistical significance (P=0.08), in base substitutions in cells with the 84F polymorphism. Results We observed no significant effect for the 1143 V coding single nucleotide polymorphism on mutant frequency. In contrast, we observed a significant increase in mutant frequency (P<0.01) in lymphocytes from smokers with the 84F coding single nucleotide polymorphism compared with smokers homozygous for the referent L84 wild-type allele. A multiple regression analysis indicated that the mutant frequency increased significantly as a function of the 84F coding single nucleotide polymorphism and smoking, according to the model; mutant frequency (x 10(-5))=0.90+ 0.618 (84F polymorphism) + 0.46 (smoking) with R-2 =0.22. Mutation spectra analysis revealed an apparent increase, which was short of statistical significance (P=0.08), in base substitutions in cells with the 84F polymorphism. Conclusions These new data suggest that the 84F coding single nucleotide polymorphism may alter the phenotype of the MGMT protein, resulting in suboptimal repair of O-6- methylguanine lesions after exposure to alkylating agents. Pharmacogenetics and Genomics 17:743-753 (c) 2007 Lippincott Williams & Wilkins.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据