Association of dietary and genetic factors related to one‐carbon metabolism with global methylation level of leukocyte DNA

Global hypomethylation of leukocyte DNA has been associated with an increased risk of cancer. As dietary and genetic factors related to one‐carbon metabolism may influence both the methylation and synthesis of DNA, we investigated associations between these factors and the global methylation level o...

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Veröffentlicht in:Cancer science 2012-12, Vol.103 (12), p.2159-2164
Hauptverfasser: Ono, Hiroe, Iwasaki, Motoki, Kuchiba, Aya, Kasuga, Yoshio, Yokoyama, Shiro, Onuma, Hiroshi, Nishimura, Hideki, Kusama, Ritsu, Ohnami, Sumiko, Sakamoto, Hiromi, Yoshida, Teruhiko, Tsugane, Shoichiro
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container_end_page 2164
container_issue 12
container_start_page 2159
container_title Cancer science
container_volume 103
creator Ono, Hiroe
Iwasaki, Motoki
Kuchiba, Aya
Kasuga, Yoshio
Yokoyama, Shiro
Onuma, Hiroshi
Nishimura, Hideki
Kusama, Ritsu
Ohnami, Sumiko
Sakamoto, Hiromi
Yoshida, Teruhiko
Tsugane, Shoichiro
description Global hypomethylation of leukocyte DNA has been associated with an increased risk of cancer. As dietary and genetic factors related to one‐carbon metabolism may influence both the methylation and synthesis of DNA, we investigated associations between these factors and the global methylation level of peripheral blood leukocyte DNA based on a cross‐sectional study of 384 Japanese women. Dietary intake of folate and vitamins B2, B6, and B12 was assessed with a validated semiquantitative food frequency questionnaire. Five polymorphisms in methylenetetrahydrofolate reductase (MTHFR) (rs1801133 and rs1801131), methionine synthase (MTR) (rs1805087), and methionine synthase reductase (MTRR) (rs10380 and rs162049) were genotyped. Global DNA methylation of leukocyte DNA was quantified using Luminometric Methylation Assay. A linear trend of association between methylation and dietary and genetic factors was evaluated by regression coefficients in a multivariable linear regression model. Mean global methylation level (standard deviation) was 70.2% (3.4) and range was from 59.0% to 81.2%. Global methylation level significantly decreased by 0.36% (95% confidence interval, 0.03–0.69) per quartile category for folate level. Subgroup analysis suggested that alcohol drinking modified the association between folate intake and global methylation level (Pinteraction = 0.01). However, no statistically significant association was observed for intake of vitamins B2, B6, and B12, alcohol consumption, or five single nucleotide polymorphisms of MTHFR, MTR, and MTRR. We found that higher folate intake was significantly associated with a lower level of global methylation of leukocyte DNA in a group of healthy Japanese females.
doi_str_mv 10.1111/cas.12013
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As dietary and genetic factors related to one‐carbon metabolism may influence both the methylation and synthesis of DNA, we investigated associations between these factors and the global methylation level of peripheral blood leukocyte DNA based on a cross‐sectional study of 384 Japanese women. Dietary intake of folate and vitamins B2, B6, and B12 was assessed with a validated semiquantitative food frequency questionnaire. Five polymorphisms in methylenetetrahydrofolate reductase (MTHFR) (rs1801133 and rs1801131), methionine synthase (MTR) (rs1805087), and methionine synthase reductase (MTRR) (rs10380 and rs162049) were genotyped. Global DNA methylation of leukocyte DNA was quantified using Luminometric Methylation Assay. A linear trend of association between methylation and dietary and genetic factors was evaluated by regression coefficients in a multivariable linear regression model. Mean global methylation level (standard deviation) was 70.2% (3.4) and range was from 59.0% to 81.2%. Global methylation level significantly decreased by 0.36% (95% confidence interval, 0.03–0.69) per quartile category for folate level. Subgroup analysis suggested that alcohol drinking modified the association between folate intake and global methylation level (Pinteraction = 0.01). However, no statistically significant association was observed for intake of vitamins B2, B6, and B12, alcohol consumption, or five single nucleotide polymorphisms of MTHFR, MTR, and MTRR. 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As dietary and genetic factors related to one‐carbon metabolism may influence both the methylation and synthesis of DNA, we investigated associations between these factors and the global methylation level of peripheral blood leukocyte DNA based on a cross‐sectional study of 384 Japanese women. Dietary intake of folate and vitamins B2, B6, and B12 was assessed with a validated semiquantitative food frequency questionnaire. Five polymorphisms in methylenetetrahydrofolate reductase (MTHFR) (rs1801133 and rs1801131), methionine synthase (MTR) (rs1805087), and methionine synthase reductase (MTRR) (rs10380 and rs162049) were genotyped. Global DNA methylation of leukocyte DNA was quantified using Luminometric Methylation Assay. A linear trend of association between methylation and dietary and genetic factors was evaluated by regression coefficients in a multivariable linear regression model. Mean global methylation level (standard deviation) was 70.2% (3.4) and range was from 59.0% to 81.2%. Global methylation level significantly decreased by 0.36% (95% confidence interval, 0.03–0.69) per quartile category for folate level. Subgroup analysis suggested that alcohol drinking modified the association between folate intake and global methylation level (Pinteraction = 0.01). However, no statistically significant association was observed for intake of vitamins B2, B6, and B12, alcohol consumption, or five single nucleotide polymorphisms of MTHFR, MTR, and MTRR. 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As dietary and genetic factors related to one‐carbon metabolism may influence both the methylation and synthesis of DNA, we investigated associations between these factors and the global methylation level of peripheral blood leukocyte DNA based on a cross‐sectional study of 384 Japanese women. Dietary intake of folate and vitamins B2, B6, and B12 was assessed with a validated semiquantitative food frequency questionnaire. Five polymorphisms in methylenetetrahydrofolate reductase (MTHFR) (rs1801133 and rs1801131), methionine synthase (MTR) (rs1805087), and methionine synthase reductase (MTRR) (rs10380 and rs162049) were genotyped. Global DNA methylation of leukocyte DNA was quantified using Luminometric Methylation Assay. A linear trend of association between methylation and dietary and genetic factors was evaluated by regression coefficients in a multivariable linear regression model. Mean global methylation level (standard deviation) was 70.2% (3.4) and range was from 59.0% to 81.2%. Global methylation level significantly decreased by 0.36% (95% confidence interval, 0.03–0.69) per quartile category for folate level. Subgroup analysis suggested that alcohol drinking modified the association between folate intake and global methylation level (Pinteraction = 0.01). However, no statistically significant association was observed for intake of vitamins B2, B6, and B12, alcohol consumption, or five single nucleotide polymorphisms of MTHFR, MTR, and MTRR. We found that higher folate intake was significantly associated with a lower level of global methylation of leukocyte DNA in a group of healthy Japanese females.</abstract><cop>England</cop><pub>John Wiley &amp; Sons, Inc</pub><pmid>22957669</pmid><doi>10.1111/cas.12013</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record>
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subjects 5-Methyltetrahydrofolate-homocysteine S-methyltransferase
Adult
Age
Aged
Alcohol use
Blood
Breast cancer
Cancer
Carbon
Carbon - metabolism
Case-Control Studies
Cross-Sectional Studies
Deoxyribonucleic acid
Diet
Dietary intake
DNA
DNA biosynthesis
DNA Methylation
Drinking behavior
Enzymes
Epigenetics
Ethanol
Female
Folic acid
Folic Acid - administration & dosage
Food
Genetic factors
Genetic Predisposition to Disease
Genetic testing
Health care
Humans
Inventories
Leukocytes
Leukocytes - metabolism
Metabolism
Methionine
Methylenetetrahydrofolate reductase
Methylenetetrahydrofolate Reductase (NADPH2) - genetics
Methylenetetrahydrofolate Reductase (NADPH2) - metabolism
Original
Peripheral blood
Polymorphism, Single Nucleotide
Questionnaires
Regression analysis
Single-nucleotide polymorphism
Standard deviation
Statistical analysis
Studies
Vitamin B
Vitamin B 12 - administration & dosage
Vitamin B 6 - administration & dosage
Vitamin B12
Vitamin B6
Vitamins
Vitamins - administration & dosage
title Association of dietary and genetic factors related to one‐carbon metabolism with global methylation level of leukocyte DNA
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