title: Polymorphisms of the GSTM1, GSTP1, MPO, XRCC1, and NQO1 genes in Chinese patients with non-small cell lung cancers: relationship with aberrant promoter methylation of the CDKN2A and RARB genes.
abstract: An association between functional polymorphisms of genes resulting in decreased detoxification of carcinogens or DNA repair and aberrant promoter methylation is an attractive hypothesis in lung carcinogenesis. The genotypes at polymorphic sites of the glutathione S-transferase (GST) M1 (null/wildtype) and P1 (nucleotide 2627 A/G), myeloperoxidase (MPO) (nucleotide -463 G/A), X-ray repair cross-complementing group 1 (XRCC1) (nucleotides 26304 C/T; 28152 G/A), and NADPH quinine oxidoreductase (NQO1) (nucleotide 609 C/T) genes in 75 Chinese patients with non-small cell lung cancer (NSCLC) were characterized with polymerase chain reaction-restriction fragment length polymorphism. Results were correlated with aberrant methylation of the CDKN2A (alias p16(INK4A)), retinoic acid receptor beta (RARB), methylguanine-DNA methyltransferase (MGMT), and death-associated-protein (DAP) kinase genes in the tumors. In comparison with an age-matched control, none of the polymorphisms were associated with increased lung cancer risks. In male patients, however, the MPO -463 GG homozygous state was associated with CDKN2A (alias p16(INK4A)) methylation (odds ratio OR=3.63, 95% confidence interval CI=1.26-10.51), and the XRCC1 26304 T allele in the heterozygous/homozygous state was associated with methylation of CDKN2A (OR=6.13, 95% CI=1.55-24.16) and RARB (OR=7.67, 95% CI=1.62-36.18). In female patients, the GSTP1 G allele in the heterozygous/homozygous state was associated with RARB methylation (OR=18.0, 95% CI=0.76-427.29). These results showed that functional deficiencies in metabolic pathways that protect cells from carcinogen induced DNA damage might be linked to aberrant promoter methylation of the CDKN2A and RARB genes during lung carcinogenesis.
authors.affiliation: University Department of Medicine, Professorial Block, Queen Mary Hospital, Pokfulam Road, Hong Kong SAR, China.
authors.forename: Eunice C
authors.initials: EC
authors.lastname: Chan
authors.forename: Shui Y
authors.initials: SY
authors.lastname: Lam
authors.forename: Kin H
authors.initials: KH
authors.lastname: Fu
authors.forename: Yok L
authors.initials: YL
authors.lastname: Kwong
mesh_terms: D044466:Asian People; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics*; D019175:DNA Methylation; D004268:DNA-Binding Proteins / Q000235:genetics*; D005260:Female; D019942:Genes, p16; D005838:Genotype; D051549:Glutathione S-Transferase pi; D005982:Glutathione Transferase / Q000235:genetics*; D016179:Granulocyte Colony-Stimulating Factor; D016298:Hematopoietic Cell Growth Factors / Q000235:genetics*; D006801:Humans; D007377:Interleukin-3; D007527:Isoenzymes / Q000235:genetics*; D008175:Lung Neoplasms / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D011401:Promoter Regions, Genetic; D018168:Receptors, Retinoic Acid / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000235:genetics*; D011994:Recombinant Proteins; D000076105:X-ray Repair Cross Complementing Protein 1
chemical_list: D004268:DNA-Binding Proteins; D051549:Glutathione S-Transferase pi; D005982:Glutathione Transferase; D016179:Granulocyte Colony-Stimulating Factor; D016298:Hematopoietic Cell Growth Factors; D007377:Interleukin-3; D007527:Isoenzymes; D018168:Receptors, Retinoic Acid; D011993:Recombinant Fusion Proteins; D011994:Recombinant Proteins; D000076105:X-ray Repair Cross Complementing Protein 1; C000619371:XRCC1 protein, human; C404145:myelopoietin; C082925:retinoic acid receptor beta; C496556:GSTP1 protein, human