title: Polymorphic variants of folate metabolism genes and the risk of laryngeal cancer.
abstract: Carcinogenesis may result from abnormal methylation of cancer-related genes regulatory sequence. Though, the polymorphic variants of genes encoding enzymes of folate and methionine metabolism may have an effect on DNA methylation. Using PCR-RFLPs, we examined the polymorphism distribution of genes encoding methionine synthase (MTR); 5,10-methylenetetrahydrofolate dehydrogenase, 5,10-methenyltetrahydrofolate cyclohydrolase and 10-formyltetrahydrofolate synthetase (MTHFD1); and methylenetetrahydrofolate reductase (MTHFR) in patients with larynx cancer (n = 131) and controls (n = 250). Patients with MTR 2756AG or GG genotypes displayed a 1.856 -fold increased risk of larynx cancer (95% CI = 1.1860-2.903, P = 0.0076). However, we did not observe an increased risk for the homozygous GG genotype OR = 1.960 (95% CI = 0.6722-5.713, P = 0.2535). Moreover, we did not observe statistical differences in distribution of MTHFR 677C>T, 1298A>C and MTHFD1 1958G>A allele and genotype frequencies in patients and controls. Our findings confirm the significance of the role of the methyl cycle in etiopathogenesis of laryngeal cancer.
authors: Department of Biochemistry and Molecular Biology, Poznań University of Medical Sciences, Poznań, Poland.
authors: Łukasz
authors: Ł
authors: Kruszyna
authors: Margarita
authors: M
authors: Lianeri
authors: Małgorzata
authors: M
authors: Rydzanicz
authors: Marzena
authors: M
authors: Gajecka
authors: Krzysztof
authors: K
authors: Szyfter
authors: Paweł P
authors: PP
authors: Jagodziński
mesh_terms: D013766:5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase / Q000235:genetics*; D016022:Case-Control Studies; D005492:Folic Acid / Q000378:metabolism*; D005787:Gene Frequency / Q000235:genetics; D020022:Genetic Predisposition to Disease; D006801:Humans; D007822:Laryngeal Neoplasms / Q000201:enzymology / Q000235:genetics* / Q000473:pathology; D008297:Male; D008754:Methylenetetrahydrofolate Dehydrogenase (NADP) / Q000235:genetics*; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics*; D008875:Middle Aged; D015778:Minor Histocompatibility Antigens; D009362:Neoplasm Metastasis; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*
chemical_list: D015778:Minor Histocompatibility Antigens; D005492:Folic Acid; D042965:Methylenetetrahydrofolate Reductase (NADPH2); C539735:MTHFD1 protein, human; D008754:Methylenetetrahydrofolate Dehydrogenase (NADP); D013766:5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase