Functional analysis of polymorphism haplotypes of MGMT in residents of high background radiation area

Abstract

To investigate the distribution of polymorphisms and their frequent haplotypes in the regulatory region of MGMT in residents of high background radiation area (HBRA) and their impacts on transcriptional activity, we collected DNA samples from 83 healthy Chinese residents in HBRA and searched for genetic polymorphisms in the regulatory region of MGMT. Haplotypes were characterized by Haploview analysis. Transcriptional activities of different polymorphism haplotypes were detected by using a dual-luciferase reporter assay. Six genetic polymorphisms were identified within the regulatory region (1024 bp) of MGMT. Linkage disequilibrium (LD) patterns and haplotype profiles were analyzed using the identified genetic polymorphisms. These polymorphisms we found to be in high LD, with a D' of 0.928 (r2 = 0.581) for -808 T>C and -19 C>T, 0.928 (r2 = 0.581) for -797 G>A and -19 C>T in Han Chinese HBRA residents. Complete LD with a D' of 1.0 (r2 = 1.0) was observed between -808 T>C and -797 G>A. Haploview analysis revealed the existence of three polymorphism haplotypes in the core region of regulatory region of MGMT. Using serially truncated regulatory region of human MGMT luciferase reporter gene constructs, we found a 1002 bp (-637 nt to +365 nt) fragment in the MGMT gene was the core region. Dual-luciferase reporter assays showed that different polymorphism haplotypes bearing different variant alleles exhibit distinct transcriptional activities, especially the polymorphism haplotype carrying -19 T has the strongest transcriptional activity. In summary, the present study obtained genetic characteristics of the six polymorphisms in the regulatory region of the MGMT gene in HBRA residents, and the results suggest that different polymorphism haplotypes have significant effects on the transcriptional activity of the MGMT and that the -19 C>T polymorphism may be a functional variant involved in the transcriptional regulation of the MGMT gene.

Keywords: MGMT; haplotypes; high background radiation area; polymorphisms.