title: Association between polymorphisms of folate- and methionine-metabolizing enzymes and susceptibility to malignant lymphoma.
abstract: Genetic alteration is considered a probable cause of malignant lymphoma. Folate and methionine metabolism play essential roles in DNA synthesis and DNA methylation, and their metabolic pathways might thus affect disease susceptibility. In the present study, 2 polymorphisms were evaluated for a folate metabolic enzyme, methylenetetrahydrofolate reductase (MTHFR), and one was evaluated for methionine synthase (MS). The 2 polymorphisms, MTHFR677 C-->T and MTHFR1298 A-->C, are reported to reduce the enzyme activity, which causes intracellular accumulation of 5,10-methylenetetrahydrofolate and results in a reduced incidence of DNA double-strand breakage. The MS2756 A-->G polymorphism also reduces the enzyme activity and results in the hypomethylation of DNA. To evaluate the association between malignant lymphoma susceptibility and these polymorphisms, hospital-based case-control study was conducted in Aichi Cancer Center. Ninety-eight patients with histologically confirmed lymphoma and 243 control subjects without cancer were evaluated. Unconditional logistic regression analyses revealed a higher susceptibility with the MTHFR677 CC and the MTHFR1298 AA genotypes (odds ratio, 2.26; 95% confidence interval, 1.26-4.02) when those harboring at least one variant allele in either polymorphism of MTHFR were defined as the reference. For the MS polymorphism, the MS2756 GG genotype also showed a higher susceptibility (odds ratio, 3.83; 95% CI, 1.21-12.1) than those with MS2756 AA or AG types. The significance was not altered when these 3 polymorphisms were evaluated in combination, and the results suggest that folate and methionine metabolism play important roles in the occurrence of malignant lymphomas. Further studies to confirm the association and detailed biologic mechanisms are now required.
authors.affiliation: Division of Epidemiology and Prevention, the Department of Hematology and Chemotherapy, the Nagoya University Graduate School of Medicine, Japan. kmatsuo@aichigw.aichi-cc.pref.aichi.jp
authors.forename: K
authors.initials: K
authors.lastname: Matsuo
authors.forename: R
authors.initials: R
authors.lastname: Suzuki
authors.forename: N
authors.initials: N
authors.lastname: Hamajima
authors.forename: M
authors.initials: M
authors.lastname: Ogura
authors.forename: Y
authors.initials: Y
authors.lastname: Kagami
authors.forename: H
authors.initials: H
authors.lastname: Taji
authors.forename: E
authors.initials: E
authors.lastname: Kondoh
authors.forename: S
authors.initials: S
authors.lastname: Maeda
authors.forename: S
authors.initials: S
authors.lastname: Asakura
authors.forename: S
authors.initials: S
authors.lastname: Kaba
authors.forename: S
authors.initials: S
authors.lastname: Nakamura
authors.forename: M
authors.initials: M
authors.lastname: Seto
authors.forename: Y
authors.initials: Y
authors.lastname: Morishima
authors.forename: K
authors.initials: K
authors.lastname: Tajima
mesh_terms: D013766:5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase / Q000235:genetics*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D004247:DNA / Q000096:biosynthesis; D019175:DNA Methylation; D005492:Folic Acid / Q000378:metabolism*; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D016015:Logistic Models; D008223:Lymphoma / Q000235:genetics*; D008715:Methionine / Q000378:metabolism*; D042965:Methylenetetrahydrofolate Reductase (NADPH2); D008875:Middle Aged; D000587:Oxidoreductases Acting on CH-NH Group Donors / Q000235:genetics*; D011110:Polymorphism, Genetic
chemical_list: D004247:DNA; D005492:Folic Acid; D008715:Methionine; D000587:Oxidoreductases Acting on CH-NH Group Donors; D042965:Methylenetetrahydrofolate Reductase (NADPH2); D013766:5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase