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Microsomal glutathione S-transferase gene polymorphisms and colorectal cancer risk in a Han Chinese population.

AbstractBACKGROUND AND AIMS:
Glutathione S-transferases (GSTs) are phase II detoxification enzymes. Human GSTs have been classified into cytosolic, mitochondrial, and microsomal families. Several studies reported the association of colorectal cancer (CRC) risk with the genetic polymorphisms of cytosolic GSTs. The microsomal GSTs are structurally distinct but functionally similar to cytosolic GSTs; their association with CRC has not been reported. In this report, we summarized the result of a case-control study aimed at investigating the association of MGST1 gene locus polymorphisms with CRC risk among Han Chinese.
PATIENT/METHODS:
Three hundred and seventy-two healthy controls and 238 sporadic CRC patients participated in this study. DNA resequencing was conducted for the 3.4 kb genomic DNA region containing the promoter, exons, exon-intron junctions, and the 5' and 3' untranslated regions.
RESULTS:
We detected 13 single nucleotide polymorphisms (SNPs) including four novel SNPs not reported in database/literature. The gene shows a much higher nucleotide diversity than most human genes. The linkage and recombination analysis revealed 24 common haplotypes (13% > or = freq > or = 1%) and identified extensive intragenic recombination throughout the MGST1 locus (R = 81.8). Significant CRC association (P < or = 0.005) was not detected for each individual SNP. However, SNPs 102G>A and 16416G>A reached a marginal level of statistical significance with P values of 0.016 and 0.078, respectively. A combined genotype analysis detected a statistically significant CRC association for individuals carrying 102G>A/16416G>A (GG/GG) genotype (adjusted OR, 1.682; 95% confidence interval (CI), 1.177-2.404; P = 0.004). Consistent with the results of genotype analysis, the GG haplotype (102G>A/16416G>A) with two risk alleles was associated with a significantly higher CRC risk comparing with the haplotypes with one or no risk allele (adjusted OR 1.744; 95% CI 1.309-2.322; P = 0.0001).
CONCLUSION:
The results suggest that MGST1 polymorphisms may contribute to CRC risk among Han Chinese.
AuthorsHao Zhang, Ling-Hong Liao, Shuk-Ming Liu, Kwok-Wai Lau, Albert Kai-Cheong Lai, Jin-Hui Zhang, Qi Wang, Xiao-Qian Chen, Wei Wei, Hua Liu, Jian-Hua Cai, Maria Li Lung, Susan S W Tai, Madeline Wu
JournalInternational journal of colorectal disease (Int J Colorectal Dis) Vol. 22 Issue 10 Pg. 1185-94 (Oct 2007) ISSN: 0179-1958 [Print] Germany
PMID17483957 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • DNA
  • Glutathione Transferase
  • leukotriene-C4 synthase
Topics
  • Adult
  • Aged
  • Aged, 80 and over
  • Asian People (genetics)
  • Base Sequence
  • Case-Control Studies
  • Colorectal Neoplasms (enzymology, genetics)
  • DNA
  • Female
  • Gene Expression Regulation
  • Genetic Predisposition to Disease
  • Genotype
  • Glutathione Transferase (genetics)
  • Humans
  • Male
  • Microsomes (enzymology)
  • Middle Aged
  • Polymorphism, Single Nucleotide (genetics)

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