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Wen J, Wu Y, Luo Q. DNA methyltransferases-associated long non-coding RNA PRKCQ-AS1 regulate DNA methylation in myelodysplastic syndrome. Int J Lab Hematol 2024. [PMID: 38679027 DOI: 10.1111/ijlh.14297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 04/08/2024] [Indexed: 05/01/2024]
Abstract
INTRODUCTION Myelodysplastic syndrome (MDS) is a group of clonal hematopoietic stem cell disorders. DNA hypermethylation is considered to be the key mechanism of pathogenesis for MDS. Studies have demonstrated that DNA methylation can be regulated by the co-effect between long non-coding RNAs (lncRNAs) and DNA methyltransferases (DNMTs). The aim of this study was to identify DNMTs-associated differentially expressed (DE) lncRNAs, which may be a novel diagnostic and therapeutic target for MDS. METHODS Two gene expression profile datasets (GSE4619 and GSE19429) were downloaded from the Gene Expression Omnibus (GEO) database. Systematic bioinformatics analysis was conducted. Then we verified the expression of PRKCQ-AS1 in MDS patients and features in SKM-1 cells. RESULTS Bioinformatics analysis revealed that the DNMT-associated DE-lncRNA PRKCQ-AS1 was functionally related to DNA methylation. The target genes of PRKCQ-AS1 associated with DNA methylation are mainly methionine synthetase (MTR) and ten-eleven-translocation 1 (TET1). Moreover, the high expression of PRKCQ-AS1 was verified in real MDS cases. Further cellular analysis in SKM-1 cells revealed that overexpressed PRKCQ-AS1 promoted methylation levels of long interspersed nuclear element 1 (LINE-1) and cell proliferation, and apparently elevated both mRNA and protein levels of MTR and TET1, while knockdown of PRKCQ-AS1 showed opposite trend in SKM-1 cells. CONCLUSION DNMT-associated DE-lncRNA PRKCQ-AS1 may affects DNA methylation levels by regulating MTR and TET1.
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Affiliation(s)
- Jian Wen
- Department of Hematology, Nanxishan Hospital of Guangxi Zhuang Autonomous Region, Guilin, Guangxi Zhuang Autonomous Region, China
| | - Yongbin Wu
- Department of Laboratory Medicine, Nanxishan Hospital of Guangxi Zhuang Autonomous Region, Guilin, Guangxi Zhuang Autonomous Region, China
| | - Quanfang Luo
- Department of Hematology, Nanxishan Hospital of Guangxi Zhuang Autonomous Region, Guilin, Guangxi Zhuang Autonomous Region, China
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Chaudhary V, Bhattacharjee D, Devi NK, Saraswathy KN. Global DNA Methylation Levels Viz-a-Viz Genetic and Biochemical Variations in One Carbon Metabolic Pathway: An Exploratory Study from North India. Biochem Genet 2024:10.1007/s10528-023-10659-4. [PMID: 38356009 DOI: 10.1007/s10528-023-10659-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 12/29/2023] [Indexed: 02/16/2024]
Abstract
Despite the importance of one carbon metabolic pathway (OCMP) in modulating the DNA methylation process, only a few population-based studies have explored their relationship among healthy individuals. This study aimed to understand the variations in global DNA methylation levels with respect to selected genetic (CBS 844ins68, MTRR A66G, MTR A2756G, and MTHFR C677T polymorphisms) and biochemical (folate, vitamin B12, and homocysteine) markers associated with OCMP among healthy North Indian adults. The study has been conducted among 1095 individuals of either sex (69.5% females), aged 30-75 years. A sample of 5 mL of blood was collected from each participant. Homocysteine, folate, and vitamin B12 levels were determined using the chemiluminescence technique. Restriction digestion was performed for genotyping MTRR A66G, MTR A2756G, and MTHFR C677T polymorphisms and allele-specific PCR amplification for CBS 844ins68 polymorphism. Global DNA methylation levels were analyzed using ELISA-based colorimetric technique. Of the selected genetic and biochemical markers, the mutant MTRR A66G allele was positively associated with global DNA methylation levels. Further, advanced age was inversely associated with methylation levels. MTRR 66GG genotype group was hypermethylated than other genotypes in folate replete and vitamin B12 deficient group (a condition prevalent among vegetarians), suggesting that the G allele may be more efficient than the wild-type allele in such conditions. Global DNA methylation levels appeared to be more influenced by genetic than biochemical factors. MTRR 66G allele may have a selective advantage in vitamin B12 deficient conditions. Further research should be undertaken to understand how genetics affects epigenetic processes.
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Affiliation(s)
- Vineet Chaudhary
- Department of Anthropology, University of Delhi, Delhi, 110007, India
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Elqadi M, Eweidat K, Abu Sabha M, Yagmour A, Sabarneh A, Nasereddin A, Ereqat S. Methylenetetrahydrofolate reductase C677T gene polymorphism and the association with dyslipidemia in type 2 diabetic Palestinian patients. J Clin Lab Anal 2021; 35:e23994. [PMID: 34498771 PMCID: PMC8529134 DOI: 10.1002/jcla.23994] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Revised: 08/23/2021] [Accepted: 08/30/2021] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Dyslipidemia in diabetes is common and characterized by hypertriglyceridemia with decreased levels of high-density lipoprotein. The objective of this study was to assess the prevalence of MTHFR C677T polymorphism in Palestinian T2DM patients and to investigate the association between this polymorphism and lipid profile in diabetic patients with and without dyslipidemia. METHODS A total of 208 T2DM patients including 98 with dyslipidemia and 110 without dyslipidemia were enrolled in this study. The MTHFR C677T genotyping was conducted by PCR-RFLP followed by agarose gel electrophoresis. RESULTS There were no significant differences in either the genotype distribution or allele frequency in T2DM patients with or without dyslipidemia (37.8% CC, 54% CT, 8.2% TT vs. 48.2% CC, 41.8% CT, 11% TT; p = 0.209). However, among the dyslipidemic group, the TT carriers have a higher HDL level (46.8 ± 17.8) compared to (CC+CT) carriers (34.68 + 11.9) (p = 0.01). In the group without dyslipidemia, there was a significant elevation in diastolic blood pressure (DBP) among the CC carriers (83.6 ± 10.6) compared to those who carried at least one mutant allele (CT+TT) (78.1 ± 11.1) (p = 0.009). CONCLUSIONS The study shows that in our Palestinian population the MTHFR 677TT genotype lowers DBP significantly in patients without dyslipidemia and is related to increased level of HDL in diabetic dyslipidemia patients.
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Affiliation(s)
- Muawiyah Elqadi
- Faulty of Medicine, Al-Quds University, East Jerusalem, Palestine
| | - Khaled Eweidat
- Faulty of Medicine, Al-Quds University, East Jerusalem, Palestine
| | - Mosa Abu Sabha
- Faulty of Medicine, Al-Quds University, East Jerusalem, Palestine
| | - Asil Yagmour
- Faulty of Medicine, Al-Quds University, East Jerusalem, Palestine
| | - Anas Sabarneh
- Palestine Medical Complex, laboratories Division, Ramallah, Palestine
| | - Abedalmajeed Nasereddin
- Al-Quds Nutrition and Health Research institute Faculty of Medicine, Al-Quds University, East Jerusalem, Palestine
| | - Suheir Ereqat
- Biochemistry and Molecular Biology Department, Faculty of Medicine, Al-Quds University, East Jerusalem, Palestine
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Stojković L, Zec M, Zivkovic M, Bundalo M, Bošković M, Glibetić M, Stankovic A. Polyphenol-Rich Aronia melanocarpa Juice Consumption Affects LINE-1 DNA Methylation in Peripheral Blood Leukocytes in Dyslipidemic Women. Front Nutr 2021; 8:689055. [PMID: 34222308 PMCID: PMC8247759 DOI: 10.3389/fnut.2021.689055] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 05/26/2021] [Indexed: 12/27/2022] Open
Abstract
Cardiovascular disease (CVD) is associated with alterations in DNA methylation and polyunsaturated fatty acid (PUFA) profile, both modulated by dietary polyphenols. The present parallel, placebo-controlled study (part of the original clinical study registered as NCT02800967 at www.clinicaltrials.gov) aimed to determine the impact of 4-week daily consumption of polyphenol-rich Aronia melanocarpa juice (AMJ) treatment on Long Interspersed Nucleotide Element-1 (LINE-1) methylation in peripheral blood leukocytes and on plasma PUFAs, in subjects (n = 54, age range of 40.2 ± 6.7 years) at moderate CVD risk, including an increased body mass index, central obesity, high normal blood pressure, and/or dyslipidemia. The goal was also to examine whether factors known to affect DNA methylation (folate intake levels, MTHFR C677T gene variant, anthropometric and metabolic parameters) modulated the LINE-1 methylation levels upon the consumption of polyphenol-rich aronia juice. Experimental analysis of LINE-1 methylation was done by MethyLight method. MTHFR C677T genotypes were determined by the polymerase chain reaction–restriction fragment length polymorphism method, and folate intake was assessed by processing the data from the food frequency questionnaire. PUFAs were measured by gas–liquid chromatography, and serum lipid profile was determined by using Roche Diagnostics kits. The statistical analyses were performed using Statistica software package. In the comparison after vs. before the treatment period, in dyslipidemic women (n = 22), we observed significant decreases in LINE-1 methylation levels (97.54 ± 1.50 vs. 98.39 ± 0.86%, respectively; P = 0.01) and arachidonic acid/eicosapentaenoic acid ratio [29.17 ± 15.21 vs. 38.42 (25.96–89.58), respectively; P = 0.02]. The change (after vs. before treatment) in LINE-1 methylation directly correlated with the presence of MTHFR 677T allele, average daily folate intake, and the change in serum low-density lipoprotein cholesterol but inversely correlated with the change in serum triacylglycerols (R = 0.72, R2 = 0.52, adjusted R2 = 0.36, P = 0.03). The current results imply potential cardioprotective effects of habitual polyphenol-rich aronia juice consumption achieved through the modifications of DNA methylation pattern and PUFAs in subjects at CVD risk, which should be further confirmed. Hence, the precision nutrition-driven modulations of both DNA methylation and PUFA profile may become targets for new approaches in the prevention of CVD.
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Affiliation(s)
- Ljiljana Stojković
- Laboratory for Radiobiology and Molecular Genetics, Department of Health and Environmental Research, "Vinča" Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Manja Zec
- Centre of Research Excellence in Nutrition and Metabolism, Institute for Medical Research-National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia.,Department of Nutritional Sciences, University of Arizona, Tucson, AZ, United States
| | - Maja Zivkovic
- Laboratory for Radiobiology and Molecular Genetics, Department of Health and Environmental Research, "Vinča" Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Maja Bundalo
- Laboratory for Radiobiology and Molecular Genetics, Department of Health and Environmental Research, "Vinča" Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia.,Institute of Experimental Biomedicine, University Hospital Würzburg, Würzburg, Germany
| | - Maja Bošković
- Laboratory for Radiobiology and Molecular Genetics, Department of Health and Environmental Research, "Vinča" Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Marija Glibetić
- Centre of Research Excellence in Nutrition and Metabolism, Institute for Medical Research-National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Aleksandra Stankovic
- Laboratory for Radiobiology and Molecular Genetics, Department of Health and Environmental Research, "Vinča" Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
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Borsi E, Serban CL, Potre C, Potre O, Putnoky S, Samfireag M, Tudor R, Ionita I, Ionita H. High Carbohydrate Diet Is Associated with Severe Clinical Indicators, but Not with Nutrition Knowledge Score in Patients with Multiple Myeloma. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18105444. [PMID: 34069672 PMCID: PMC8161065 DOI: 10.3390/ijerph18105444] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 05/14/2021] [Accepted: 05/17/2021] [Indexed: 12/16/2022]
Abstract
Although the survival rate of patients diagnosed with multiple myeloma has doubled over the last few decades, due to the introduction of new therapeutic lines and improvement of care, other potential contributors to the therapeutic response/relapse of disease, such as nutrient intake, along with nutrition knowledge, have not been assessed during the course of the disease. The purpose of this research was to assess nutrition knowledge and diet quality in a group of patients with a diagnosis of multiple myeloma. Anthropometric, clinical and biological assessments and skeletal survey evaluations, along with the assessment of nutritional intake and general nutrition knowledge, were performed on 61 patients with a current diagnosis of multiple myeloma. A low carbohydrate diet score was computed, classified in tertiles, and used as a factor in the analysis. Patients in tertiles indicative of high carbohydrate or low carbohydrate intake showed significant alteration of clinical parameters, such as hemoglobin, uric acid, albumin, total proteins, beta-2 microglobulin, percentage of plasmacytes in the bone marrow and D-dimers, compared to patients in the medium carbohydrate intake tertile. Nutrition knowledge was not associated with clinical indicators of disease status, nor with patterns of nutrient intake. Better knowledge of food types and nutritional value of foods, along with personalized nutritional advice, could encourage patients with MM to make healthier decisions that might extend survival.
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Affiliation(s)
- Ema Borsi
- Discipline of Hematology, Department of Internal Medicine, Victor Babes University of Medicine and Pharmacy, 300041 Timisoara, Timis County, Romania; (E.B.); (C.P.); (O.P.); (I.I.); (H.I.)
| | - Costela Lacrimioara Serban
- Department of Functional Science, Victor Babes University of Medicine and Pharmacy, 300041 Timisoara, Timis County, Romania
- Correspondence: (C.L.S.); (S.P.); Tel.: +40-770-198-363 (C.L.S.)
| | - Cristina Potre
- Discipline of Hematology, Department of Internal Medicine, Victor Babes University of Medicine and Pharmacy, 300041 Timisoara, Timis County, Romania; (E.B.); (C.P.); (O.P.); (I.I.); (H.I.)
- Hematology Clinic, Timisoara’s Emergency City Hospital, 300723 Timisoara, Timis County, Romania;
| | - Ovidiu Potre
- Discipline of Hematology, Department of Internal Medicine, Victor Babes University of Medicine and Pharmacy, 300041 Timisoara, Timis County, Romania; (E.B.); (C.P.); (O.P.); (I.I.); (H.I.)
- Hematology Clinic, Timisoara’s Emergency City Hospital, 300723 Timisoara, Timis County, Romania;
| | - Salomeia Putnoky
- Department of Microbiology, Victor Babes University of Medicine and Pharmacy, 300041 Timisoara, Timis County, Romania;
- Correspondence: (C.L.S.); (S.P.); Tel.: +40-770-198-363 (C.L.S.)
| | - Miruna Samfireag
- Hematology Clinic, Timisoara’s Emergency City Hospital, 300723 Timisoara, Timis County, Romania;
- Department of Internal Medicine, Discipline of Clinical Practical Skills, Victor Babes University of Medicine and Pharmacy, 300041 Timisoara, Timis County, Romania
| | - Raluca Tudor
- Department of Neurology, Victor Babes University of Medicine and Pharmacy, 300041 Timisoara, Timis County, Romania;
| | - Ioana Ionita
- Discipline of Hematology, Department of Internal Medicine, Victor Babes University of Medicine and Pharmacy, 300041 Timisoara, Timis County, Romania; (E.B.); (C.P.); (O.P.); (I.I.); (H.I.)
- Hematology Clinic, Timisoara’s Emergency City Hospital, 300723 Timisoara, Timis County, Romania;
| | - Hortensia Ionita
- Discipline of Hematology, Department of Internal Medicine, Victor Babes University of Medicine and Pharmacy, 300041 Timisoara, Timis County, Romania; (E.B.); (C.P.); (O.P.); (I.I.); (H.I.)
- Hematology Clinic, Timisoara’s Emergency City Hospital, 300723 Timisoara, Timis County, Romania;
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Genetic variants in S-adenosyl-methionine synthesis pathway and nonsyndromic cleft lip with or without cleft palate in Chile. Pediatr Res 2021; 89:1020-1025. [PMID: 32492698 DOI: 10.1038/s41390-020-0994-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 05/25/2020] [Indexed: 02/03/2023]
Abstract
BACKGROUND The S-adenosyl-methionine (SAM) availability is crucial for DNA methylation, an epigenetic mechanism involved in nonsyndromic cleft lip with or without cleft palate (NSCL/P) expression. The aim of this study was to assess the association between single-nucleotide polymorphisms (SNPs) of genes involved in SAM synthesis and NSCL/P in a Chilean population. METHODS In 234 cases and 309 controls, 18 SNPs in AHCY, MTR, MTRR, and MAT2A were genotyped, and the association between them and the phenotype was evaluated based on additive (allele), dominant, recessive and haplotype models, by odds ratio (OR) computing. RESULTS Three deep intronic SNPs of MTR showed a protective effect on NSCL/P expression: rs10925239 (OR 0.68; p = 0.0032; q = 0.0192), rs10925254 (OR 0.66; p = 0.0018; q = 0.0162), and rs3768142 (OR 0.66; p = 0.0015; q = 0.0162). Annotations in expression database demonstrate that the protective allele of the three SNPs is associated with a reduction of MTR expression summed to the prediction by bioinformatic tools of its potentiality to modify splicing sites. CONCLUSIONS The protective effect against NSCL/P of these intronic MTR SNPs seems to be related to a decrease in MTR enzyme expression, modulating the SAM availability for proper substrate methylation. However, functional analyses are necessary to confirm our findings. IMPACT SAM synthesis pathway genetic variants are factors associated to NSCL/P. This article adds new evidence for folate related genes in NSCL/P in Chile. Its impact is to contribute with potential new markers for genetic counseling.
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Gosselt HR, Griffioen PH, van Zelst BD, Oosterom N, de Jonge R, Heil SG. Global DNA (hydroxy)methylation is stable over time under several storage conditions and temperatures. Epigenetics 2020; 16:45-53. [PMID: 32614650 PMCID: PMC7889142 DOI: 10.1080/15592294.2020.1786318] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Background: Epigenetic markers are often quantified and related to disease in stored samples. While, effects of storage on stability of these markers have not been thoroughly examined. In this longitudinal study, we investigated the influence of storage time, material, temperature, and freeze-thaw cycles on stability of global DNA (hydroxy)methylation. Methods: EDTA blood was collected from 90 individuals. Blood (n = 30, group 1) and extracted DNA (n = 30, group 2) were stored at 4°C, −20°C and −80°C for 0, 1 (endpoint blood 4°C), 6, 12 or 18 months. Additionally, freeze-thaw cycles of blood and DNA samples (n = 30, group 3) were performed over three days. Global DNA methylation and hydroxymethylation (mean ± SD) were quantified using liquid chromatography–electrospray ionization–tandem mass spectrometry (LC-ESI-MS/MS) with between-run precision of 2.8% (methylation) and 6.3% (hydroxymethylation). Effects on stability were assessed using linear mixed models. Results: global DNA methylation was stable over 18 months in blood at −20°C and −80°C and DNA at 4°C and −80°C. However, at 18 months DNA methylation from DNA stored at −20°C relatively decreased −6.1% compared to baseline. Global DNA hydroxymethylation was more stable in DNA samples compared to blood, independent of temperature (p = 0.0131). Stability of global DNA methylation and hydroxymethylation was not affected up to three freeze – thaw cycles. Conclusion: Global DNA methylation and hydroxymethylation stored as blood and DNA can be used for epigenetic studies. The relevance of small differences occuring during storage depend on the expected effect size and research question.
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Affiliation(s)
- Helen R Gosselt
- Department of Clinical Chemistry, Erasmus MC, University Medical Center Rotterdam , Rotterdam, The Netherlands.,Department of Clinical Chemistry, Amsterdam Gastroenterology and Metabolism, Amsterdam UMC, Vrije Universiteit Amsterdam , Amsterdam, The Netherlands
| | - Pieter H Griffioen
- Department of Clinical Chemistry, Erasmus MC, University Medical Center Rotterdam , Rotterdam, The Netherlands
| | - Bertrand D van Zelst
- Department of Clinical Chemistry, Erasmus MC, University Medical Center Rotterdam , Rotterdam, The Netherlands
| | - Natanja Oosterom
- Department of Clinical Chemistry, Erasmus MC, University Medical Center Rotterdam , Rotterdam, The Netherlands
| | - Robert de Jonge
- Department of Clinical Chemistry, Amsterdam Gastroenterology and Metabolism, Amsterdam UMC, Vrije Universiteit Amsterdam , Amsterdam, The Netherlands
| | - Sandra G Heil
- Department of Clinical Chemistry, Erasmus MC, University Medical Center Rotterdam , Rotterdam, The Netherlands
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Impact of the MTHFR C677T polymorphism on one-carbon metabolites: Evidence from a randomised trial of riboflavin supplementation. Biochimie 2020; 173:91-99. [PMID: 32330571 DOI: 10.1016/j.biochi.2020.04.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 04/04/2020] [Accepted: 04/06/2020] [Indexed: 12/11/2022]
Abstract
Homozygosity for the C677T polymorphism in MTHFR (TT genotype) is associated with a 24-87% increased risk of hypertension. Blood pressure (BP) lowering was previously reported in adults with the TT genotype, in response to supplementation with the MTHFR cofactor, riboflavin. Whether the BP phenotype associated with the polymorphism is related to perturbed one-carbon metabolism is unknown. This study investigated one-carbon metabolites and their responsiveness to riboflavin in adults with the TT genotype. Plasma samples from adults (n 115) screened for the MTHFR genotype, who previously participated in RCTs to lower BP, were analysed for methionine, S-adenosylmethionine (SAM), S-adenosylhomocysteine (SAH), betaine, choline and cystathionine by liquid chromatography tandem mass spectrometry (LC-MS/MS). The one-carbon metabolite response to riboflavin (1.6 mg/d; n 24) or placebo (n 23) for 16 weeks in adults with the TT genotype was also investigated. Plasma SAM (74.7 ± 21.0 vs 85.2 ± 22.6 nmol/L, P = 0.013) and SAM:SAH ratio (1.66 ± 0.55 vs 1.85 ± 0.51, P = 0.043) were lower and plasma homocysteine was higher (P = 0.043) in TT, compared to CC individuals. In response to riboflavin, SAM (P = 0.008) and cystathionine (P = 0.045) concentrations increased, with no responses in other one-carbon metabolites observed. These findings confirm perturbed one-carbon metabolism in individuals with the MTHFR 677TT genotype, and for the first time demonstrate that SAM, and cystathionine, increase in response to riboflavin supplementation in this genotype group. The genotype-specific, one-carbon metabolite responses to riboflavin intervention observed could offer some insight into the role of this gene-nutrient interaction in blood pressure.
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Shafeeque CM, Sathyan S, Saradalekshmi KR, Premkumar S, Allapatt JP, Banerjee M. Methylation map genes can be critical in determining the methylome of intracranial aneurysm patients. Epigenomics 2020; 12:859-871. [PMID: 32266834 DOI: 10.2217/epi-2019-0280] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: Intracranial aneurysm is often asymptomatic until the time of rupture. Elevated homocysteine is reported in vascular diseases. Identifying early events in homocysteine metabolism through methylation map genes may prevent fatality. Materials & methods: In the present study, we investigated the role of variants in methylation map genes in ethnically matched 480 individuals that can influence the homocysteine levels and promote development of aneurysm. Results: The study demonstrates that the genetic variants in folate cycle and methionine cycle genes such as MTHFR, MTRR, MTR, BHMT and DNMT1 are associated with the risk of aneurysm. Conclusion: The associated allelic variants in these genes have functional relevance and are predictive of decreased expression indicative of altered methylation levels that may result in elevated homocysteine.
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Affiliation(s)
- Chathathayil Mohammedali Shafeeque
- Department of Human Molecular Genetics, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, Kerala, India.,Department of Biotechnology, Kerala University, Karyvattom, Thiruvananthapuram, Kerala, India
| | - Sanish Sathyan
- Department of Human Molecular Genetics, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, Kerala, India
| | | | - Sasi Premkumar
- Department of Neurosurgery, Calicut Medical College, Calicut, Kerala, India
| | - Jacob P Allapatt
- Department of Neurosurgery, Calicut Medical College, Calicut, Kerala, India
| | - Moinak Banerjee
- Department of Human Molecular Genetics, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, Kerala, India
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Plumptre L, Tammen SA, Sohn KJ, Masih SP, Visentin CE, Aufreiter S, Malysheva O, Schroder TH, Ly A, Berger H, Croxford R, Lamers Y, Caudill MA, Choi SW, O'Connor DL, Kim YI. Maternal and Cord Blood Folate Concentrations Are Inversely Associated with Fetal DNA Hydroxymethylation, but Not DNA Methylation, in a Cohort of Pregnant Canadian Women. J Nutr 2020; 150:202-211. [PMID: 31562504 DOI: 10.1093/jn/nxz232] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 06/28/2019] [Accepted: 09/03/2019] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Aberrancies in fetal DNA methylation programming may modify disease susceptibility of the offspring. Maternal folate status has potential to alter fetal DNA methylation. OBJECTIVES We examined the association of maternal and cord blood concentrations of folate and unmetabolized folic acid (UMFA), vitamin B-12, vitamin B-6, and choline with fetal DNA methylation and hydroxymethylation and assessed potential modifying effects of 38 fetal genetic variants in 22 genes. METHODS Nutrient blood concentrations were measured in 368 pregnant women in early pregnancy (12-16 wk of gestation) and at delivery (37-42 wk of gestation) and in cord blood. DNA methylation and hydroxymethylation in cord blood mononuclear cells were quantified by LC-MS/MS. Pearson partial correlations were used to determine the association between individual nutrients and DNA methylation and hydroxymethylation. RESULTS Serum and RBC folate and plasma UMFA concentrations (primary outcomes) in early pregnancy, at delivery, and in cord blood were not significantly associated with fetal DNA methylation. In contrast, maternal RBC folate in early pregnancy (r = -0.16, P = 0.04) and cord plasma UMFA (r = -0.23, P = 0.004) were inversely correlated with fetal DNA hydroxymethylation. Neither maternal and cord blood concentrations of other nutrients nor fetal genotypes (secondary outcomes) were significantly associated with fetal DNA methylation or hydroxymethylation. Infants born to mothers with RBC folate concentrations in the highest quartile and serum vitamin B-12 concentrations in the lowest quartile in early pregnancy had significantly lower fetal DNA methylation and higher birth weight compared with those born to mothers with lower RBC folate and higher serum vitamin B-12 concentrations (P = 0.01). CONCLUSIONS Maternal and cord blood folate concentrations are associated with fetal DNA hydroxymethylation, but not DNA methylation, in a cohort of pregnant Canadian women. The observation that high folate and low vitamin B-12 maternal status in early pregnancy may be associated with decreased fetal DNA methylation and higher birth weight warrants further investigation. This trial was registered at clinicaltrials.gov as NCT02244684.
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Affiliation(s)
- Lesley Plumptre
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.,Keenan Research Center for Biomedical Science of St Michael's Hospital, Toronto, Ontario, Canada
| | - Stephanie A Tammen
- Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA, USA
| | - Kyoung-Jin Sohn
- Keenan Research Center for Biomedical Science of St Michael's Hospital, Toronto, Ontario, Canada.,Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Shannon P Masih
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.,Keenan Research Center for Biomedical Science of St Michael's Hospital, Toronto, Ontario, Canada
| | - Carly E Visentin
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.,Keenan Research Center for Biomedical Science of St Michael's Hospital, Toronto, Ontario, Canada
| | - Susanne Aufreiter
- Translational Medicine, Research Institute, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Olga Malysheva
- Division of Nutritional Sciences, College of Human Ecology, Cornell University, Ithaca, NY, USA
| | - Theresa H Schroder
- Food, Nutrition, and Health Program, Faculty of Land and Food Systems, Vancouver Campus, University of British Columbia, Vancouver, British Columbia, Canada
| | - Anna Ly
- Keenan Research Center for Biomedical Science of St Michael's Hospital, Toronto, Ontario, Canada.,Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Howard Berger
- Department of Obstetrics and Gynecology, St Michael's Hospital, Toronto, Ontario, Canada
| | - Ruth Croxford
- Freelance Statistics Consultant, Toronto, Ontario, Canada
| | - Yvonne Lamers
- Food, Nutrition, and Health Program, Faculty of Land and Food Systems, Vancouver Campus, University of British Columbia, Vancouver, British Columbia, Canada
| | - Marie A Caudill
- Division of Nutritional Sciences, College of Human Ecology, Cornell University, Ithaca, NY, USA
| | - Sang-Woon Choi
- Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA, USA.,Chaum Life Center, CHA School of Medicine, Seoul, Korea
| | - Deborah L O'Connor
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.,Translational Medicine, Research Institute, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Young-In Kim
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.,Keenan Research Center for Biomedical Science of St Michael's Hospital, Toronto, Ontario, Canada.,Department of Medicine, University of Toronto, Toronto, Ontario, Canada
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Ma T, Sun XH, Yao S, Chen ZK, Zhang JF, Xu WD, Jiang XY, Wang XF. Genetic Variants of Homocysteine Metabolism, Homocysteine, and Frailty - Rugao Longevity and Ageing Study. J Nutr Health Aging 2020; 24:198-204. [PMID: 32003411 DOI: 10.1007/s12603-019-1304-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVES Recently, elevated homocysteine was reported to be associated with frailty in cross-sectional studies. However, whether homocysteine is causally associated with frailty is unknown. Here, we explore the inter-relationships between five non-synonymous genetic variants of homocysteine metabolic four genes, plasma homocysteine levels, and frailty. METHOD Data of 1480 individuals aged 70-87 years from the ageing arm of Rugao Longevity and Ageing Study were used. Five variants of the four homocysteine metabolic enzyme genes were genotyped. Frailty was defined using Fried's phenotype criteria. RESULTS The percentage of high homocysteine (>15μmol/L) is 33.3%. Two functional variants that decrease methylenetetrahydrofolate reductase (MTHFR) activities, C677T (Ala222Val, rs1801133) and A1298C (Glu429Ala, rs1801131), were significantly associated with increased homocysteine levels (β=-1.16, p=0.01; and β=1.46, p<0.001, respectively). In addition, homocysteine increase gradually from CC-CC, CC-AC, CT-AC, CT-AA, CC-AA, to TT-AA genotypes of the C677T-A1298C combinations. The five polymorphisms in the homocysteine metabolic gene was not associated with frailty. However, homocysteine was significantly associated with frailty with an OR of 2.27 (95% 1.36-3.78) for high homocysteine after adjusting for multiple confounding factors. CONCLUSION Elevated homocysteine is not a causal factor but a biomarker that manifests greater possibility of frailty in high risk elderly individuals for prevention.
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Affiliation(s)
- T Ma
- Professor Xiao-Feng Wang, Unit of epidemiology, MOE Key Laboratory of Contemporary Anthropology, Human Phenome Institute, Fudan University, Shanghai 200433, China; E-mail address: . Xiao-Yan Jiang, Key laboratory of Arrhythmias of the Ministry of education of China, Tongji University school of Medicine, shanghai 200092, People's republic of China; E-mail address:
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Plasma Homocysteine and Polymorphisms of Genes Involved in Folate Metabolism Correlate with DNMT1 Gene Methylation Levels. Metabolites 2019; 9:metabo9120298. [PMID: 31817852 PMCID: PMC6950100 DOI: 10.3390/metabo9120298] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 12/01/2019] [Accepted: 12/05/2019] [Indexed: 12/22/2022] Open
Abstract
DNA methyltransferase 1 (DNMT1) is responsible for the maintenance of DNA methylation patterns during cell division. Several human diseases are characterized by impaired DNMT1 gene methylation, but less is known about the factors that regulate DNMT1 promoter methylation levels. Dietary folates and related B-vitamins are essential micronutrients for DNA methylation processes, and we performed the present study to investigate the contribution of circulating folate, vitamin B12, homocysteine, and common polymorphisms in folate pathway genes to the DNMT1 gene methylation levels. We investigated DNMT1 gene methylation levels in peripheral blood DNA samples from 215 healthy individuals. All the DNA samples were genotyped for MTHFR 677C > T (rs1801133) and 1298A > C (rs1801131), MTRR 66A > G (rs1801394), MTR 2756A > G (rs1805087), SLC19A1 (RFC1) 80G > A (rs1051266), TYMS 28-bp tandem repeats (rs34743033) and 1494 6-bp insertion/deletion (indel) (rs34489327), DNMT3A -448A > G (rs1550117), and DNMT3B -149C > T (rs2424913) polymorphisms. Circulating homocysteine, folate, and vitamin B12 levels were available from 158 of the recruited individuals. We observed an inverse correlation between plasma homocysteine and DNMT1 methylation levels. Furthermore, both MTR rs1805087 and TYMS rs34743033 polymorphisms showed a statistically significant effect on DNMT1 methylation levels. The present study revealed several correlations between the folate metabolic pathway and DNMT1 promoter methylation that could be of relevance for those disorders characterized by altered DNA methylation.
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MTHFR Gene Polymorphism Is Associated With DNA Hypomethylation and Genetic Damage Among Benzene-Exposed Workers in Southeast China. J Occup Environ Med 2019; 60:e188-e192. [PMID: 29370017 DOI: 10.1097/jom.0000000000001288] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
OBJECTIVE AND METHODS To analyze the association between global DNA methylation and single-nucleotide polymorphisms (SNPs) in methylenetetrahydrofolate reductase (MTHFR). MTHFR polymorphisms rs1801133 and rs1801131 were detected using the restriction fragment length polymorphism method, and cytokinesis-block micronucleus (MN) frequency and global DNA methylation was measured in workers from 410 shoe factories. RESULTS A multilinear regression analysis demonstrated that DNA methylation of the TT variant allele of rs1801133 was lower than that of the CC wild type allele (Exp(β) [95% CI], 0.76 [0.56, 1.02], P = 0.071), with a P-value approaching significance. A significantly increased MN frequency was observed for carriers of the TT genotype (frequency ratio = 1.27, 95% CI: 1.07-1.51, P < 0.01). CONCLUSION The results imply that the TT genotype in rs1801133 is associated with global DNA hypomethylation, which may influence the induction of MN following exposure to benzene.
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Associations of MTRR and TSER polymorphisms related to folate metabolism with susceptibility to metabolic syndrome. Genes Genomics 2019; 41:983-991. [PMID: 31209768 DOI: 10.1007/s13258-019-00840-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 06/06/2019] [Indexed: 12/16/2022]
Abstract
BACKGROUND Hyperhomocysteinemia is a potential risk factor for the development of metabolic syndrome (MetS). Among genes involved in homocysteine metabolism, polymorphisms of methylenetetrahydrofolate reductase (MTHFR) gene are known to be associated with MetS incidence. However, effects of polymorphisms of other folate metabolism-related genes on MetS susceptibility are not well known yet. OBJECTIVE This study was to determine whether methionine synthase (MTR) 2756A > G, methionine synthase reductase (MTRR) 66A > G, and thymidylate synthase enhancer region (TSER) 2R/3R polymorphisms might be associated with risks of MetS development in the Korean population. METHODS Genotype analysis of the three polymorphisms was performed for a total of 483 subjects including 236 MetS patients and 247 unrelated healthy controls using polymerase chain reaction-restriction fragment length polymorphism technique. RESULTS The present study revealed that MTRR and TSER polymorphisms were associated with susceptibility to MetS. Several genotypes and allele combinations from the three polymorphisms were also related to the MetS prevalence. When polymorphism data were stratified according to the risk components of MetS, MTR polymorphism was significantly associated with an increased risk of MetS in subjects with systolic blood pressure < 132.7 mmHg (AOR 1.842, 95% CI 1.039-3.266, P = 0.037) and fasting blood glucose level < 106.3 mg/dL (AOR 1.772, 95% CI 1.069-2.937, P = 0.027). MTRR polymorphism was significantly associated with a decreased risk of MetS in subjects with triglyceride level < 216.3 mg/dL (AOR 0.616, 95% CI 0.399-0.951, P = 0.029). To the best of our knowledge, this is the first to provide reliable evidence about the association of other folate metabolism-related gene polymorphisms besides MTHFR with MetS susceptibility and its risk factors. CONCLUSION Results of this study suggest that MTRR and TSER polymorphisms might be potential genetic markers for the risk of MetS development in Korean population.
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Mc Auley MT, Mooney KM, Salcedo-Sora JE. Computational modelling folate metabolism and DNA methylation: implications for understanding health and ageing. Brief Bioinform 2019; 19:303-317. [PMID: 28007697 DOI: 10.1093/bib/bbw116] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Indexed: 11/12/2022] Open
Abstract
Dietary folates have a key role to play in health, as deficiencies in the intake of these B vitamins have been implicated in a wide variety of clinical conditions. The reason for this is folates function as single carbon donors in the synthesis of methionine and nucleotides. Moreover, folates have a vital role to play in the epigenetics of mammalian cells by supplying methyl groups for DNA methylation reactions. Intriguingly, a growing body of experimental evidence suggests that DNA methylation status could be a central modulator of the ageing process. This has important health implications because the methylation status of the human genome could be used to infer age-related disease risk. Thus, it is imperative we further our understanding of the processes which underpin DNA methylation and how these intersect with folate metabolism and ageing. The biochemical and molecular mechanisms, which underpin these processes, are complex. However, computational modelling offers an ideal framework for handling this complexity. A number of computational models have been assembled over the years, but to date, no model has represented the full scope of the interaction between the folate cycle and the reactions, which governs the DNA methylation cycle. In this review, we will discuss several of the models, which have been developed to represent these systems. In addition, we will present a rationale for developing a combined model of folate metabolism and the DNA methylation cycle.
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Affiliation(s)
- Mark T Mc Auley
- Department of Chemical Engineering, Thornton Science Park, University of Chester, UK
| | - Kathleen M Mooney
- Faculty of Health and Social Care, Edge Hill University, Ormskirk, Lancashire, UK
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Arab AH, Elhawary NA. Methylenetetrahydrofolate Reductase Gene Variants Confer Potential Vulnerability to Autism Spectrum Disorder in a Saudi Community. Neuropsychiatr Dis Treat 2019; 15:3569-3581. [PMID: 31920317 PMCID: PMC6938732 DOI: 10.2147/ndt.s230348] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Accepted: 12/12/2019] [Indexed: 02/05/2023] Open
Abstract
PURPOSE Several interacting genes or single nucleotide polymorphisms (SNPs) are vulnerable to the risk of autism spectrum disorder (ASD). Here we explored associations between SNPs in the methylenetetrahydrofolate reductase (MTHFR) gene or combined genotypes and the risk of ASD in a Saudi community. SUBJECTS AND METHODS ASD severity symptoms were assessed according to the Diagnostic and Statistical Manual of Mental Disorders (DSM-V) criteria and scores on the childhood autism rating scale (CARS). Genomic DNA from buccal cells was analyzed for 112 cases and 104 healthy controls using TaqMan genotyping assays of 677C>T rs1801133 and 1298A>C rs1801131 SNPs in the MTHFR gene. SNPStats software was utilized to determine the best interactive model of inheritance of genotypic data. RESULTS Controls were consistent with Hardy-Weinberg equilibrium in the examined SNPs. Our data showed associations between the 677C>T and 1298A>C SNPs and ASD risk (odds ratio [OR]= 5.2; 95% confidence interval [CI], 3.1-9.8 and OR= 22.2; 95% CI, 7.9-62.3, respectively). Genotype associations of 677C>T and 1298A>C were identified in cases compared with controls (P= 0.0012 and P= 0.0008, respectively). The examined SNPs were significantly associated with ASD cases having ≥37 scores (codominant and recessive models; P= 0.001 and P= 0.0005, respectively). Six combined genotypes-C/C-A/A (42.9%), C/T-A/A (17.9%), C/T-C/C (14.5%), C/T-A/C (10.9%), T/T-C/C (10.9%), and T/T-A/A (3.6%)-were found in ASD cases. Global haplotype analysis showed a significant difference in haplotype distribution between cases and controls (P= 0.00057). The two SNPs were found to be in relatively strong linkage disequilibrium (D`= 0.63, r 2= 0.260). CONCLUSION Our findings suggest that the 677C>T and 1298A>C SNPs add to each other for potential vulnerability to increase the risk of ASD, particularly if they can be confirmed in larger cohorts along with other genetic/environmental factors. Our study could create reference data for future genetic association studies in the Saudi population and for use by government and health experts to develop regional health management programs.
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Affiliation(s)
- Arwa H Arab
- Department of Psychology, Faculty of Arts and Humanities, King Abdul-Aziz University, Jeddah21589, Saudi Arabia
- Correspondence: Arwa H Arab; Nasser A Elhawary Tel +966 55 369 2180 Email ;
| | - Nasser A Elhawary
- Department of Medical Genetics, Faculty of Medicine, Umm Al-Qura University, Mecca21955, Saudi Arabia
- Department of Molecular Genetics, Medical Genetics Center, Faculty of Medicine, Ain Shams University, Cairo11566, Egypt
- Correspondence: Arwa H Arab; Nasser A Elhawary Tel +966 55 369 2180 Email ;
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Rainero I, Vacca A, Roveta F, Govone F, Gai A, Rubino E. Targeting MTHFR for the treatment of migraines. Expert Opin Ther Targets 2018; 23:29-37. [PMID: 30451038 DOI: 10.1080/14728222.2019.1549544] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
INTRODUCTION Migraine is a common neurovascular disorder classified by the World Health Organization as one of the most debilitating diseases. Migraine is a complex disease and is a consequence of an interaction between genetic, epigenetic and environmental factors. The MTHFR gene is one of the few replicated genetic risk factors for migraine and encodes an enzyme that is crucial for the folate and the methionine cycles. Individuals carrying the T allele of the MTHFR C677T polymorphism have increased plasma concentrations of homocysteine which leads to endothelial cell injury and alterations in coagulant properties of blood. Areas covered: This review focuses on the recent advances in genetics and the role of the MTHFR gene and homocysteine metabolism in migraine etiopathogenesis. The article summarizes the potential of targeting MTHFR and homocysteine for disease prevention. Expert opinion: Determination of MTHFR C677T polymorphisms as well as measurement of homocysteine concentrations may be useful to migraine patients, particularly those suffering from migraine with aura. Preliminary studies support the use of folate, vitamin B6 and vitamin B12 for the prevention of migraine. However, the results of these studies await replication in larger randomized controlled clinical trials.
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Affiliation(s)
- Innocenzo Rainero
- a Headache Center, Department of Neuroscience "Rita Levi Montalcini" , University of Torino , Torino , Italy
| | - Alessandro Vacca
- a Headache Center, Department of Neuroscience "Rita Levi Montalcini" , University of Torino , Torino , Italy
| | - Fausto Roveta
- a Headache Center, Department of Neuroscience "Rita Levi Montalcini" , University of Torino , Torino , Italy
| | - Flora Govone
- a Headache Center, Department of Neuroscience "Rita Levi Montalcini" , University of Torino , Torino , Italy
| | - Annalisa Gai
- a Headache Center, Department of Neuroscience "Rita Levi Montalcini" , University of Torino , Torino , Italy
| | - Elisa Rubino
- a Headache Center, Department of Neuroscience "Rita Levi Montalcini" , University of Torino , Torino , Italy
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Borai IH, Soliman AF, Ahmed HM, Ahmed GF, Kassim SK. Association of MTHFR C677T and ABCA1 G656A polymorphisms with obesity among Egyptian children. GENE REPORTS 2018. [DOI: 10.1016/j.genrep.2018.03.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Silva MBD, Melo ARDS, Costa LDA, Barroso H, Oliveira NFPD. Global and gene-specific DNA methylation and hydroxymethylation in human skin exposed and not exposed to sun radiation. An Bras Dermatol 2018; 92:793-800. [PMID: 29364434 PMCID: PMC5786392 DOI: 10.1590/abd1806-4841.20175875] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Accepted: 08/07/2016] [Indexed: 12/19/2022] Open
Abstract
Background epigenomes can be influenced by environmental factors leading to the
development of diseases. Objective To investigate the influence of sun exposure on global DNA methylation and
hydroxymethylation status and at specific sites of the miR-9-1, miR-9-3 and
MTHFR genes in skin samples of subjects with no history of skin
diseases. Methods Skin samples were obtained by punch on sun-exposed and sun-protected arm
areas from 24 corpses of 16-89 years of age. Genomic DNA was extracted from
skin samples that were ranked according to Fitzpatrick's criteria as light,
moderate, and dark brown. Global DNA methylation and hydroxymethylation and
DNA methylation analyses at specific sites were performed using ELISA and
MSP, respectively. Results No significant differences in global DNA methylation and hydroxymethylation
levels were found among the skin areas, skin types, or age. However,
gender-related differences were detected, where women showed higher
methylation levels. Global DNA methylation levels were higher than
hydroxymethylation levels, and the levels of these DNA modifications
correlated in skin tissue. For specific sites, no differences among the
areas were detected. Additional analyses showed no differences in the
methylation status when age, gender, and skin type were considered; however,
the methylation status of the miR-9-1 gene seems to be gender related. Study limitations there was no separation of dermis and epidermis and low sample size. Conclusion sun exposure does not induce changes in the DNA methylation and
hydroxymethylation status or in miR-9-1, miR-9-3 and MTHFR genes for the
studied skin types.
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Affiliation(s)
- Mikaelly Batista da Silva
- Center for Exact Sciences and Nature, Post-graduate Program in Cellular and Molecular Biology, Universidade Federal da Paraíba (UFPB) -Paraíba, (PB), Brazil
| | - Alanne Rayssa da Silva Melo
- Center for Exact Sciences and Nature, Post-graduate Program in Cellular and Molecular Biology, Universidade Federal da Paraíba (UFPB) -Paraíba, (PB), Brazil
| | - Ludimila de Araújo Costa
- Center for Exact Sciences and Nature, Post-graduate Program in Cellular and Molecular Biology, Universidade Federal da Paraíba (UFPB) -Paraíba, (PB), Brazil
| | - Haline Barroso
- Center for Exact Sciences and Nature, Post-graduate Program in Cellular and Molecular Biology, Universidade Federal da Paraíba (UFPB) -Paraíba, (PB), Brazil
| | - Naila Francis Paulo de Oliveira
- Center for Exact Sciences and Nature, Post-graduate Program in Cellular and Molecular Biology, Universidade Federal da Paraíba (UFPB) -Paraíba, (PB), Brazil
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Wang J, Xu L, Xia H, Li Y, Tang S. Association of MTHFR C677T gene polymorphism with metabolic syndrome in a Chinese population: a case-control study. J Int Med Res 2018; 46:2658-2669. [PMID: 29658358 PMCID: PMC6124264 DOI: 10.1177/0300060518768969] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Objective To investigate the association of the MTHFR C677T gene polymorphism with metabolic syndrome (MetS) in people in Hubei Province, China. Methods A case–control study was conducted with 651 subjects with MetS (MetS group) and 727 healthy controls (control group) at Renmin Hospital of Wuhan University between January and December 2016. The MTHFR C677T genotype was detected by the gene chip technique and clinical data were collected. Results Body mass index, waist circumference, the waist-hip-ratio, systolic and diastolic blood pressure, fasting blood glucose, fasting insulin, triglyceride, total cholesterol, low-density lipoprotein-cholesterol, and homocysteine levels, and the homeostasis model assessment of insulin resistance were higher in the MetS group than in controls. The risk of MetS was higher for the TT genotype and T allele carriers than for the CC genotype and C allele carriers. With MetS, the TT genotype increased the risk of elevated blood pressure, fasting glucose levels, and triglyceride levels. Patients with MetS and the TT genotype showed more severe abdominal obesity, dyslipidaemia, insulin resistance, elevated blood pressure, elevated fasting glucose levels, and hyperhomocysteinaemia compared with those with the CC genotype. Conclusions In this population, MTHFR C677T gene polymorphism may be a risk factor for MetS.
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Affiliation(s)
- Jin Wang
- Physical Examination Center, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Lijuan Xu
- Physical Examination Center, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Hongmiao Xia
- Physical Examination Center, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Ying Li
- Physical Examination Center, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Shiqi Tang
- Physical Examination Center, Renmin Hospital of Wuhan University, Wuhan 430060, China
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Del Gobbo GF, Price EM, Hanna CW, Robinson WP. No evidence for association of MTHFR 677C>T and 1298A>C variants with placental DNA methylation. Clin Epigenetics 2018; 10:34. [PMID: 29564022 PMCID: PMC5851070 DOI: 10.1186/s13148-018-0468-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 03/01/2018] [Indexed: 01/30/2023] Open
Abstract
Background 5,10-Methylenetetrahydrofolate reductase (MTHFR) is a key enzyme in one-carbon metabolism that ensures the availability of methyl groups for methylation reactions. Two single-nucleotide polymorphisms (SNPs) in the MTHFR gene, 677C>T and 1298A>C, result in a thermolabile enzyme with reduced function. These variants, in both the maternal and/or fetal genes, have been associated with pregnancy complications including miscarriage, neural tube defects (NTDs), and preeclampsia (PE), perhaps due to altered capacity for DNA methylation (DNAm). In this study, we assessed the association between MTHFR 677TT and 1298CC genotypes and risk of NTDs, PE, or normotensive intrauterine growth restriction (nIUGR). Additionally, we assessed whether these high-risk genotypes are associated with altered DNAm in the placenta. Results In 303 placentas screened for this study, we observed no significant association between the occurrence of NTDs (N = 55), PE (early-onset: N = 28, late-onset: N = 20), or nIUGR (N = 21) and placental (fetal) MTHFR 677TT or 1298CC genotypes compared to healthy pregnancies (N = 179), though a trend of increased 677TT genotype in PE/IUGR together was observed (OR 2.53, p = 0.048). DNAm was profiled in 10 high-risk 677 (677TT + 1298AA), 10 high-risk 1298 (677CC + 1298CC), and 10 reference (677CC + 1298AA) genotype placentas. Linear modeling identified no significantly differentially methylated sites between high-risk 677 or 1298 and reference placentas at a false discovery rate < 0.05 and Δβ ≥ 0.05 using the Illumina Infinium HumanMethylation450 BeadChip. Using a differentially methylated region analysis or separating cytosine-guanine dinucleotides (CpGs) by CpG density to reduce multiple comparisons also did not identify differential methylation. Additionally, there was no consistent evidence for altered methylation of repetitive DNA between high-risk and reference placentas. Conclusions We conclude that large-scale, genome-wide disruption in DNAm does not occur in placentas with the high-risk MTHFR 677TT or 1298CC genotypes. Furthermore, there was no evidence for an association of the 1298CC genotype and only a tendency to higher 677TT in pregnancy complications of PE/IUGR. This may be due to small sample sizes or folate repletion in our Canadian population attenuating effects of the high-risk MTHFR variants. However, given our results and the conflicting results in the literature, investigations into alternative mechanisms that may explain the link between MTHFR variants and pregnancy complications, or in populations at risk of folate deficiencies, are warranted. Electronic supplementary material The online version of this article (10.1186/s13148-018-0468-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Giulia F Del Gobbo
- 1BC Children's Hospital Research Institute, 950 W 28th Ave, Vancouver, BC V5Z 4H4 Canada.,2Department of Medical Genetics, University of British Columbia, 4500 Oak St, Vancouver, BC V6H 3N1 Canada
| | - E Magda Price
- 1BC Children's Hospital Research Institute, 950 W 28th Ave, Vancouver, BC V5Z 4H4 Canada.,2Department of Medical Genetics, University of British Columbia, 4500 Oak St, Vancouver, BC V6H 3N1 Canada
| | - Courtney W Hanna
- 3Epigenetics Programme, Babraham Institute, Cambridge, CB22 3AT UK.,4Centre for Trophoblast Research, University of Cambridge, Cambridge, CB2 3EG UK
| | - Wendy P Robinson
- 1BC Children's Hospital Research Institute, 950 W 28th Ave, Vancouver, BC V5Z 4H4 Canada.,2Department of Medical Genetics, University of British Columbia, 4500 Oak St, Vancouver, BC V6H 3N1 Canada.,5Child and Family Research Institute, Room 2082, 950 W 28th Avenue, Vancouver, BC V5Z 4H4 Canada
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Cheng J, Tao F, Liu Y, Venners SA, Hsu YH, Jiang S, Weinstock J, Wang B, Tang G, Xu X. Associations of methylenetetrahydrofolate reductase C677T genotype with blood pressure levels in Chinese population with essential hypertension. Clin Exp Hypertens 2018; 40:207-212. [DOI: 10.1080/10641963.2017.1281937] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Jun Cheng
- School of Life Sciences, Anhui University, Hefei, China
| | - Fang Tao
- School of Life Sciences, Anhui University, Hefei, China
| | - Yanhong Liu
- School of Life Sciences, Anhui University, Hefei, China
| | - Scott A. Venners
- Faculty of Health Sciences, Simon Fraser University, Burnaby, BC, Canada
| | | | - Shanqun Jiang
- School of Life Sciences, Anhui University, Hefei, China
| | - Justin Weinstock
- Department of Statistics, University of Virginia, Charlottesville, VA, USA
| | - Binyan Wang
- Institute of Biomedicine, Anhui Medical University, Hefei, China
| | - Genfu Tang
- Institute of Biomedicine, Anhui Medical University, Hefei, China
| | - Xiping Xu
- Institute of Biomedicine, Anhui Medical University, Hefei, China
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Fragkioudaki S, Nezos A, Souliotis VL, Chatziandreou I, Saetta AA, Drakoulis N, Tzioufas AG, Voulgarelis M, Sfikakis PP, Koutsilieris M, Crow MK, Moutsopoulos HM, Mavragani CP. MTHFR gene variants and non-MALT lymphoma development in primary Sjogren's syndrome. Sci Rep 2017; 7:7354. [PMID: 28779180 PMCID: PMC5544668 DOI: 10.1038/s41598-017-07347-w] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 06/27/2017] [Indexed: 12/12/2022] Open
Abstract
Primary Sjogren’s syndrome (pSS) confers increased risk for non-Hodgkin lymphoma (NHL) development. Two common polymorphisms, the c. 677C > T and c. 1298A > C, of the methylene-tetrahydrofolate reductase (MTHFR) gene, an enzyme essential in DNA synthesis and methylation, have been associated with susceptibility to NHL. Herein, we tested the hypothesis that MTHFR variants contribute to pSS-related lymphomagenesis. 356 pSS patients, of whom 75 had MALT and 19 non-MALT NHL and 600 healthy controls were genotyped for the detection of MTHFR polymorphisms. DNA methylation levels were assessed by pyrosequencing of the LINE-1 retroelement promoter in DNA from 55 salivary gland tissues from pSS patients. DNA double-strand breaks were determined in peripheral blood mononuclear cells from 13 pSS patients, using comet assay. Αnalysis according to lymphoma subtype revealed increased frequency of c. 677C > T TT genotype and T allele, as well as reduced prevalence of the c. 1298A > C C allele in the pSS non-MALT group compared to controls and patients without NHL. MTHFR c. 677C > T TT genotype was associated with reduced DNA methylation levels, while MTHFR c. 1298A > C AC genotype with reduced DNA double-strand breaks levels. MTHFR variants may be involved in SS non-MALT NHL development, through contribution to defective DNA methylation and genomic instability.
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Affiliation(s)
- Sofia Fragkioudaki
- Department of Physiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Adrianos Nezos
- Department of Physiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Vassilis L Souliotis
- Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, Athens, Greece
| | - Ilenia Chatziandreou
- Department of Pathology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Angelica A Saetta
- Department of Pathology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Nikolaos Drakoulis
- Research Group of Clinical Pharmacology and Pharmacogenomics, Faculty of Pharmacy, School of Health Sciences, National and Kapodistrian University of Athens, Athens, Greece
| | - Athanasios G Tzioufas
- Department of Pathophysiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.,Joint Academic Rheumatology Program, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Michael Voulgarelis
- Department of Pathophysiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.,Joint Academic Rheumatology Program, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Petros P Sfikakis
- Joint Academic Rheumatology Program, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece.,First Department of Propaedeutic Internal Medicine, National and Kapodistrian University of Athens School of Medicine, Athens, Greece
| | - Michael Koutsilieris
- Department of Physiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Mary K Crow
- Mary Kirkland Center for Lupus Research, Hospital for Special Surgery, Weill Medical College of Cornell University, New York, NY, USA
| | - Haralampos M Moutsopoulos
- Department of Pathophysiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Clio P Mavragani
- Department of Physiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece. .,Department of Pathophysiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece. .,Joint Academic Rheumatology Program, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece.
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Raza ST, Abbas S, Siddiqi Z, Mahdi F. Association between ACE (rs4646994), FABP2 (rs1799883), MTHFR (rs1801133), FTO (rs9939609) Genes Polymorphism and Type 2 Diabetes with Dyslipidemia. INTERNATIONAL JOURNAL OF MOLECULAR AND CELLULAR MEDICINE 2017; 6:121-130. [PMID: 28890888 PMCID: PMC5581553 DOI: 10.22088/acadpub.bums.6.2.6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Accepted: 06/03/2017] [Indexed: 10/31/2022]
Abstract
Diabetic dyslipidemia is one of the leading causes of coronary artery disease (CAD) death. Genetic and environmental factors play an important role in the development of type 2 diabetes mellitus (T2DM) and dyslipidemia. The present study was aimed to investigate the association of ACE (rs4646994), FABP2 (rs1799883), MTHFR (rs1801133) and FTO (rs9939609) genes polymorphism in T2DM with dyslipidemia. Totally, 559 subjects including 221 T2DM cases with dyslipidemia, 158 T2DM without dyslipidemia and 180 controls were enrolled. ACE genes polymorphism was evaluated by polymerase chain reaction (PCR), while MTHFR, FABP2, FTO genes polymorphisms were evaluated by PCR and restriction fragment length polymorphism (RFLP). Significant association of ACE and MTHFR genes polymorphisms were found in both group of cases [T2DM with dyslipidemia (P<0.001, and P=0.008, respectively) and T2DM without dyslipidemia (P=0.003, and P=0.010, respectively)] while FABP2 and FTO genes polymorphisms were significantly associated with T2DM without dyslipidemia (P=0.038, and P= 0.019, respectively). This study concludes that ACE, FABP2, FTO and MTHFR genes are associated with T2DM. Additionally, it also seems that ACE and MTHFR genes might be further associated with the development of dyslipidemia in T2DM cases.
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Affiliation(s)
- Syed Tasleem Raza
- Department of Biochemistry, Era's Lucknow Medical College and Hospital, Lucknow, India
| | - Shania Abbas
- Department of Biochemistry, Era's Lucknow Medical College and Hospital, Lucknow, India
| | - Zeba Siddiqi
- Department of Medicine Era's Lucknow Medical College and Hospital, Lucknow, India
| | - Farzana Mahdi
- Department of Biochemistry, Era's Lucknow Medical College and Hospital, Lucknow, India
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25
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Sun K, Song J, Liu K, Fang K, Wang L, Wang X, Li J, Tang X, Wu Y, Qin X, Wu T, Gao P, Chen D, Hu Y. Associations between homocysteine metabolism related SNPs and carotid intima-media thickness: a Chinese sib pair study. J Thromb Thrombolysis 2017; 43:401-410. [PMID: 27822905 PMCID: PMC5337241 DOI: 10.1007/s11239-016-1449-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Carotid intima-media thickness (CIMT) is a good surrogate for atherosclerosis. Hyperhomocysteinemia is an independent risk factor for cardiovascular diseases. We aim to investigate the relationships between homocysteine (Hcy) related biochemical indexes and CIMT, the associations between Hcy related SNPs and CIMT, as well as the potential gene–gene interactions. The present study recruited full siblings (186 eligible families with 424 individuals) with no history of cardiovascular events from a rural area of Beijing. We examined CIMT, intima-media thickness for common carotid artery (CCA-IMT) and carotid bifurcation, tested plasma levels for Hcy, vitamin B6 (VB6), vitamin B12 (VB12) and folic acid (FA), and genotyped 9 SNPs on MTHFR, MTR, MTRR, BHMT, SHMT1, CBS genes. Associations between SNPs and biochemical indexes and CIMT indexes were analyzed using family-based association test analysis. We used multi-level mixed-effects regression model to verify SNP-CIMT associations and to explore the potential gene–gene interactions. VB6, VB12 and FA were negatively correlated with CIMT indexes (p < 0.05). rs2851391 T allele was associated with decreased plasma VB12 levels (p = 0.036). In FABT, CBS rs2851391 was significantly associated with CCA-IMT (p = 0.021) and CIMT (p = 0.019). In multi-level mixed-effects regression model, CBS rs2851391 was positively significantly associated with CCA-IMT (Coef = 0.032, se = 0.009, raw p < 0.001) after Bonferoni correction (corrected α = 0.0056). Gene–gene interactions were found between CBS rs2851391 and BHMT rs10037045 for CCA-IMT (p = 0.011), as well as between CBS rs2851391 and MTR rs1805087 for CCA-IMT (p = 0.007) and CIMT (p = 0.022). Significant associations are found between Hcy metabolism related genetic polymorphisms, biochemical indexes and CIMT indexes. There are complex interactions between genetic polymorphisms for CCA-IMT and CIMT.
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Affiliation(s)
- Kexin Sun
- Department of Epidemiology and Biostatistics, Peking University Health Science Center, 38 Xueyuan Road, Beijing, 100191, China
| | - Jing Song
- Department of Epidemiology and Biostatistics, Peking University Health Science Center, 38 Xueyuan Road, Beijing, 100191, China
| | - Kuo Liu
- Department of Epidemiology and Biostatistics, Capital Medical University, 10 You'anmenwai Xitoutiao, Beijing, 100069, China
| | - Kai Fang
- Beijing Center for Disease Prevention and Control, No.16 He Pingli Middle Street, Dongcheng District, Beijing, 100013, China
| | - Ling Wang
- Pingshan New District Center for Disease Control and Prevention, Shenzhen, 518118, Guangdong, China
| | - Xueyin Wang
- Department of Epidemiology and Biostatistics, Peking University Health Science Center, 38 Xueyuan Road, Beijing, 100191, China
| | - Jing Li
- Department of Epidemiology and Biostatistics, Peking University Health Science Center, 38 Xueyuan Road, Beijing, 100191, China
| | - Xun Tang
- Department of Epidemiology and Biostatistics, Peking University Health Science Center, 38 Xueyuan Road, Beijing, 100191, China
| | - Yiqun Wu
- Department of Epidemiology and Biostatistics, Peking University Health Science Center, 38 Xueyuan Road, Beijing, 100191, China
| | - Xueying Qin
- Department of Epidemiology and Biostatistics, Peking University Health Science Center, 38 Xueyuan Road, Beijing, 100191, China
| | - Tao Wu
- Department of Epidemiology and Biostatistics, Peking University Health Science Center, 38 Xueyuan Road, Beijing, 100191, China
| | - Pei Gao
- Department of Epidemiology and Biostatistics, Peking University Health Science Center, 38 Xueyuan Road, Beijing, 100191, China
| | - Dafang Chen
- Department of Epidemiology and Biostatistics, Peking University Health Science Center, 38 Xueyuan Road, Beijing, 100191, China
| | - Yonghua Hu
- Department of Epidemiology and Biostatistics, Peking University Health Science Center, 38 Xueyuan Road, Beijing, 100191, China.
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Ni G, Qin J, Chen Z, Li H, Zhou J, Huang M, Zhou L. Associations between genetic variation in one-carbon metabolism and leukocyte DNA methylation in valproate-treated patients with epilepsy. Clin Nutr 2017; 37:308-312. [PMID: 28161091 DOI: 10.1016/j.clnu.2017.01.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Revised: 01/06/2017] [Accepted: 01/09/2017] [Indexed: 11/16/2022]
Abstract
BACKGROUND Valproate (VPA) as a first-line antiepileptic drug is useful for the most types of epileptic seizure treatment. Previous studies observed that VPA influenced one-carbon metabolism (OCM), consequently, DNA methylation. However, other individual genetic variations, as well as VPA, modify DNA methylation. OBJECTIVE In this study, we investigated associations between genetic variations in OCM and leukocyte DNA methylation in VPA-treated patients with epilepsy. METHODS This was a cross-sectional study of 101 epileptic patients who underwent VPA monotherapy and 68 healthy controls. All subjects were measured OCM-related nutrients (folate, homocysteine and vitamin B12), and DNA methylation of specific regions were analyzed. Furthermore, we examined the associations between genetic variations in OCM and DNA methylation levels in epileptic patients. RESULTS VPA-treated patients with epilepsy exhibited both higher serum homocysteine and vitaminB12 levels and lower folate levels relative to controls (P = 0.018, P = 0.003, P < 0.001 respectively), the methylation level of the MTHFR amplicon was significantly lower in the VPA group compared with those in the controls (P = 0.043). VPA-treated epileptic patients carrying the T-allele of methylenetetrahydrofolate reductase (MTHFR) c.677C>T showed higher serum Hcy levels than those observed in the 677CC group (P < 0.01). Epileptic patients who carried G-allele of methionine synthase (MTR) c.2756A>G showed significantly lower MTHFR amplicon methylation levels compared to carriers of the wild-type MTR 2756AA genotype (P = 0.028). CONCLUSION Our study provided evidence that the MTR c.2756A>G polymorphism is associated with MTHFR amplicon hypomethylation in VPA-treated patients with epilepsy.
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Affiliation(s)
- Guanzhong Ni
- Department of Neurology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong Province, China
| | - Jiaming Qin
- Department of Neurology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong Province, China
| | - Ziyi Chen
- Department of Neurology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong Province, China
| | - Hongliang Li
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong Province, China
| | - Jueqian Zhou
- Department of Neurology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong Province, China
| | - Min Huang
- Institute of Clinical Pharmacology, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong Province, China
| | - Liemin Zhou
- Department of Neurology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong Province, China.
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27
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Fan S, Yang B, Zhi X, Wang Y, Zheng Q, Sun G. Combined genotype and haplotype distributions of MTHFR C677T and A1298C polymorphisms: A cross-sectional descriptive study of 13,473 Chinese adult women. Medicine (Baltimore) 2016; 95:e5355. [PMID: 27902594 PMCID: PMC5134799 DOI: 10.1097/md.0000000000005355] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Methylenetetrahydrofolate reductase (MTHFR) C677T and A1298C polymorphisms are, independently and/or in combination, associated with many disorders. However, data on the combined genotype and haplotype distributions of the 2 polymorphisms in Chinese population were limited.We recruited 13,473 adult women from 9 Chinese provinces, collected buccal cell samples, and determined genotypes, to estimate the combined genotype and haplotype distributions of the MTHFR C677T and A1298C polymorphisms.In the total sample, the 6 common combined genotypes were CT/AA (29.5%), TT/AA (21.9%), CC/AA (15.4%), CC/AC (14.9%), CT/AC (13.7%), and CC/CC (3.4%); the 3 frequent haplotypes were 677T-1298A (43.6%), 677C-1298A (37.9%), and 677C-1298C (17.6%). Importantly, we observed that there were 51 (0.4%) individuals with the CT/CC genotype, 92 (0.7%) with the TT/AC genotype, 17 (0.1%) with the TT/CC genotype, and that the frequency of the 677T-1298C haplotype was 0.9%. In addition, the prevalence of some combined genotypes and haplotypes varied among populations residing in different areas and even showed apparent geographical gradients. Further linkage disequilibrium analysis showed that the D' and r values were 0.883 and 0.143, respectively.In summary, the findings of our study provide further strong evidence that the MTHFR C677T and A1298C polymorphisms are usually in trans and occasionally in cis configurations. The frequencies of mutant genotype combinations were relatively higher in Chinese population than other populations, and showed geographical variations. These baseline data would be useful for future related studies and for developing health management programs.
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Affiliation(s)
- Shujun Fan
- Research Center of Environment and Non-Communicable Disease, School of Public Health, China Medical University, Shenyang
| | - Boyi Yang
- Guangzhou Key Laboratory of Environmental Pollution and Health Risk Assessment, Department of Preventive Medicine, School of Public Health, Sun Yat-sen University, Guangzhou
| | - Xueyuan Zhi
- Research Center of Environment and Non-Communicable Disease, School of Public Health, China Medical University, Shenyang
| | - Yanxun Wang
- Division of Molecular Preventive Medicine, Shanghai Institute of Targeted Therapy and Molecular Medicine, Shanghai, China
| | - Quanmei Zheng
- Research Center of Environment and Non-Communicable Disease, School of Public Health, China Medical University, Shenyang
| | - Guifan Sun
- Research Center of Environment and Non-Communicable Disease, School of Public Health, China Medical University, Shenyang
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Fan S, Yang B, Zhi X, Wang Y, Wei J, Zheng Q, Sun G. Interactions of Methylenetetrahydrofolate Reductase C677T Polymorphism with Environmental Factors on Hypertension Susceptibility. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2016; 13:ijerph13060601. [PMID: 27322299 PMCID: PMC4924058 DOI: 10.3390/ijerph13060601] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 06/13/2016] [Accepted: 06/14/2016] [Indexed: 02/08/2023]
Abstract
Hypertension is considered to be the result of genes, environment, and their interactions. Among them age, sex, tobacco use, alcohol consumption, and being overweight/obesity are well documented environmental determinants, and methylenetetrahydrofolate reductase (MTHFR) C677T polymorphism is nominated as a potential genetic candidate. However, the synergistic effect of the MTHFR C677T polymorphism with these environmental factors on the risk of hypertension has received little attention. The aim of this study was to explore the associations of the MTHFR C677T polymorphism, environmental factors, and their interactions with hypertension predisposition in a Northern Chinese Han population. A total of 708 participants were enrolled in the study. The genotypes of the MTHFR C677T were determined by a TaqMan assay. We found that participants of an older age, being overweight/obesity, with a smoking habit, drinking habit, or carrying the 677T allele were at an increased risk of hypertension. Additionally, there existed marginally significant interactions of the polymorphism with age and overweight/obesity. However, future large, well-designed studies in Chinese and other populations, as well as mechanistic studies, are still needed to validate our findings, especially considering that the interactions observed in our study were only marginally significant.
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Affiliation(s)
- Shujun Fan
- Environment and Non-Communicable Disease Research Center, School of Public Health, China Medical University, Shenyang 110013, China.
| | - Boyi Yang
- Guangzhou Key Laboratory of Environmental Pollution and Health Risk Assessment, Department of Preventive Medicine, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China.
| | - Xueyuan Zhi
- Environment and Non-Communicable Disease Research Center, School of Public Health, China Medical University, Shenyang 110013, China.
| | - Yanxun Wang
- Division of Molecular Preventive Medicine, Shanghai Institute of Targeted Therapy and Molecular Medicine, Shanghai 200433, China.
| | - Jian Wei
- Brain Disease Center, Tianjin Dagang Oil Field General Hospital, Tianjin 300280, China.
| | - Quanmei Zheng
- Environment and Non-Communicable Disease Research Center, School of Public Health, China Medical University, Shenyang 110013, China.
| | - Guifan Sun
- Environment and Non-Communicable Disease Research Center, School of Public Health, China Medical University, Shenyang 110013, China.
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Wang L, Shangguan S, Chang S, Yu X, Wang Z, Lu X, Wu L, Zhang T. Determining the association between methylenetetrahydrofolate reductase (MTHFR) gene polymorphisms and genomic DNA methylation level: A meta-analysis. ACTA ACUST UNITED AC 2016; 106:667-74. [PMID: 27173682 DOI: 10.1002/bdra.23511] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND The methylenetetrahydrofolate reductase (MTHFR) polymorphism is a risk factor for neural tube defects. C677T and A1298C MTHFR polymorphisms produce an enzyme with reduced folate-related one carbon metabolism, and this has been associated with aberrant methylation modifications in DNA and protein. METHODS A meta-analysis was conducted to assess the association between MTHFR C677T/A1298C genotypes and global genomic methylation. RESULTS Eleven studies met the inclusion criteria. Of these, 10 were performed on C677T MTHFR genotypes and 6 were performed on A1298C MTHFR genotypes. Our results did not indicate any correlation between global methylation and MTHFR A1298C, C677T polymorphisms. CONCLUSION The results of our study provide evidence to assess the global methylation modification alterations of MTHFR polymorphisms among individuals. However, our data did not found any conceivable proof supporting the hypothesis that common variant of MTHFR A1298C, C677T contributes to methylation modification. Birth Defects Research (Part A) 106:667-674, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Li Wang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing, China
| | - Shaofang Shangguan
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing, China
| | - Shaoyan Chang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing, China
| | - Xin Yu
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing, China
| | - Zhen Wang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing, China
| | - Xiaolin Lu
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing, China
| | - Lihua Wu
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing, China
| | - Ting Zhang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing, China
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Wang W, Jiao XH, Wang XP, Sun XY, Dong C. MTR, MTRR, and MTHFR Gene Polymorphisms and Susceptibility to Nonsyndromic Cleft Lip With or Without Cleft Palate. Genet Test Mol Biomarkers 2016; 20:297-303. [PMID: 27167580 DOI: 10.1089/gtmb.2015.0186] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE To examine the associations of methionine synthase (MTR), methionine synthase reductase (MTRR), and methylenetetrahydrofolate reductase (MTHFR) gene polymorphisms with the susceptibility to nonsyndromic cleft lip with or without cleft palate (NSCL/P). METHODS Between May 2012 and August 2014, 147 NSCL/P patients (case group) and 129 healthy volunteers (control group) were recruited for the study. The MTR A2756G, MTRR A66G, MTHFR C677T and MTHFR A1298C polymorphisms were assessed by polymerase chain reaction-restriction fragment length polymorphism. Haplotype analyses were performed with SHEsis software. Logistic regression analysis was used to evaluate the possible risk factors for NSCL/P. Generalized multifactor dimensionality reduction (GMDR) was applied to detect gene-gene interactions. RESULTS MTR A2756G, MTRR A66G, and MTHFR C677T gene polymorphisms were associated with the risk of NSCL/P (all p < 0.05). Logistic regression analysis revealed that MTR A2756G, MTR RA66G, and MTHFR C667T might increase the risk of NSCL/P (odds ratio [OR] = 0.270, 95% confidence interval [95% CI] = 0.106-0.689; OR = 0.159, 95% CI = 0.069-0.368; OR = 0.343, 95% CI = 0.139-0.844). The CA haplotype in the MTHFR gene may serve as a protective factor for NSCL/P (OR = 0.658, 95% CI = 0.470-0.923), and the TA haplotype might be a risk factor (OR = 2.001, 95% CI = 1.301-3.077). GMDR revealed that the optimal models were two- and four-dimensional models with prediction accuracies of 75.73% (p = 0.001) and 77.21% (p = 0.001) and the best cross-validation consistencies of 10/10 and 10/10, respectively. CONCLUSION MTR A2756G, MTRR A66G, and MTHFR C677T polymorphisms may be related to NSCL/P, and interactions were detected between the MTR A2756G, MTRR A66G, and MTHFR C677T and A1298C polymorphisms.
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Affiliation(s)
- Wei Wang
- Department of Oral Maxillofacial Surgery, the First Affiliated Hospital, Harbin Medical University , Harbin, China
| | - Xiao-Hui Jiao
- Department of Oral Maxillofacial Surgery, the First Affiliated Hospital, Harbin Medical University , Harbin, China
| | - Xiao-Ping Wang
- Department of Oral Maxillofacial Surgery, the First Affiliated Hospital, Harbin Medical University , Harbin, China
| | - Xiang-Yu Sun
- Department of Oral Maxillofacial Surgery, the First Affiliated Hospital, Harbin Medical University , Harbin, China
| | - Chen Dong
- Department of Oral Maxillofacial Surgery, the First Affiliated Hospital, Harbin Medical University , Harbin, China
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Shadrina AS, Sevost'ianova KS, Shevela AI, Soldatsky EY, Seliverstov EI, Demekhova MY, Shonov OA, Ilyukhin EA, Smetanina MA, Voronina EN, Pikalov IV, Zolotukhin IA, Filipenko ML. Polymorphisms in the MTHFR and MTR genes and the risk of varicose veins in ethnical Russians. Biomarkers 2016; 21:619-24. [PMID: 27097558 DOI: 10.3109/1354750x.2016.1171902] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES The objective of this study was to study the association of polymorphisms MTHFR C677T (rs1801133) and MTR A2756G (rs1805087) with the risk of varicose veins in ethnical Russians. METHODS We genotyped 475 patients with varicose veins, 168 individual without chronic venous disease, and the population-based group of 896 subjects. Association was studied using logistic regression analysis adopting co-dominant, additive, recessive, and dominant models of inheritance. RESULTS None of the polymorphisms showed a statistically significant association with the risk of varicose veins. CONCLUSIONS Our results provide evidence that the studied polymorphisms do not contribute to genetic susceptibility to varicose veins in ethnical Russians.
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Affiliation(s)
- Alexandra Sergeevna Shadrina
- a Institute of Chemical Biology and Fundamental Medicine , Novosibirsk , Russia ;,b Novosibirsk State University , Novosibirsk , Russia
| | | | | | | | | | | | | | | | | | - Elena Nikolaevna Voronina
- a Institute of Chemical Biology and Fundamental Medicine , Novosibirsk , Russia ;,b Novosibirsk State University , Novosibirsk , Russia
| | | | | | - Maxim Leonidovich Filipenko
- a Institute of Chemical Biology and Fundamental Medicine , Novosibirsk , Russia ;,b Novosibirsk State University , Novosibirsk , Russia ;,f Kazan Federal University , Kazan , Republic of Tatarstan, Russia
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Koczor CA, Jiao Z, Fields E, Russ R, Ludaway T, Lewis W. AZT-induced mitochondrial toxicity: an epigenetic paradigm for dysregulation of gene expression through mitochondrial oxidative stress. Physiol Genomics 2015. [PMID: 26199398 DOI: 10.1152/physiolgenomics.00045.2015] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Mitochondrial dysfunction causes oxidative stress and cardiomyopathy. Oxidative stress also is a side effect of dideoxynucleoside antiretrovirals (NRTI) and is observed in NRTI-induced cardiomyopathy. We show here that treatment with the NRTI AZT {1-[(2R,4S,5S)-4-azido-5-(hydroxymethyl)oxolan-2-yl]-5-methylpyrimidine-2,4-dione} modulates cardiac gene expression epigenetically through production of mitochondrially derived reactive oxygen species. Transgenic mice with ubiquitous expression of mitochondrially targeted catalase (MCAT) and C57Bl/6 wild-type mice littermates (WT) were administered AZT (0.22 mg/day po, 35 days), and cardiac DNA and mRNA were isolated. In AZT-treated WT, 95 cardiac genes were differentially expressed compared with vehicle-treated WTs. When MCAT mice were treated with AZT, each of those 95 genes reverted toward the expression of vehicle-treated WTs. In AZT-treated WT hearts, Mthfr [5,10-methylenetetrahydrofolate reductase; a critical enzyme in synthesis of methionine cycle intermediates including S-adenosylmethionine (SAM)], was overexpressed. Steady-state abundance of SAM in cardiac extracts from AZT-treated MCAT mice increased 60% above that of vehicle-treated MCAT. No such change occurred in WT. AZT caused hypermethylation (47%) and hypomethylation (53%) of differentially methylated DNA regions in WT cardiac DNA. AZT-treated MCAT heart DNA exhibited greater hypermethylation (91%) and less hypomethylation (9%) compared with vehicle-treated MCAT controls. The gene encoding protein kinase C-α displayed multifocal epigenetic regulation caused by oxidative stress. Results show that mitochondrially derived oxidative stress in the heart hinders cardiac DNA methylation, alters steady-state abundance of SAM, alters cardiac gene expression, and promotes characteristic pathophysiological changes of cardiomyopathy. This mechanism for NRTI toxicity offers insight into long-term side effects from these commonly used antiviral agents.
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Affiliation(s)
| | - Zhe Jiao
- Department of Pathology, Emory University, Atlanta, Georgia
| | - Earl Fields
- Department of Pathology, Emory University, Atlanta, Georgia
| | - Rodney Russ
- Department of Pathology, Emory University, Atlanta, Georgia
| | - Tomika Ludaway
- Department of Pathology, Emory University, Atlanta, Georgia
| | - William Lewis
- Department of Pathology, Emory University, Atlanta, Georgia
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Coppedè F, Grossi E, Lopomo A, Spisni R, Buscema M, Migliore L. Application of artificial neural networks to link genetic and environmental factors to DNA methylation in colorectal cancer. Epigenomics 2015; 7:175-86. [PMID: 25942531 DOI: 10.2217/epi.14.77] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
AIMS We applied artificial neural networks (ANNs) to understand the connections among polymorphisms of genes involved in folate metabolism, clinico-pathological features and promoter methylation levels of MLH1, APC, CDKN2A(INK4A), MGMT and RASSF1A in 83 sporadic colorectal cancer (CRC) tissues, and to link dietary and lifestyle factors with gene promoter methylation. MATERIALS & METHODS Promoter methylation was assessed by means of methylation-sensitive high-resolution melting and genotyping by PCR-RFLP technique. Data were analyzed with the Auto Contractive Map, a special kind of ANN able to define the strength of the association of each variable with all the others and to visually show the map of the main connections. RESULTS We observed a strong connection between the low methylation levels of the five CRC genes and the MTR 2756AA genotype. Several other connections were revealed, including those between dietary and lifestyle factors and the methylation levels of CRC genes. CONCLUSION ANNs revealed the complexity of the interconnections among factors linked to DNA methylation in CRC.
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Affiliation(s)
- Fabio Coppedè
- Department of Translational Research & New Technologies in Medicine & Surgery, Division of Medical Genetics, University of Pisa, Medical School, Via Roma 55, 56126 Pisa, Italy
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Milne E, Greenop KR, Scott RJ, Haber M, Norris MD, Attia J, Jamieson SE, Miller M, Bower C, Bailey HD, Dawson S, McCowage GB, de Klerk NH, van Bockxmeer FM, Armstrong BK. Folate pathway gene polymorphisms, maternal folic acid use, and risk of childhood acute lymphoblastic leukemia. Cancer Epidemiol Biomarkers Prev 2015; 24:48-56. [PMID: 25395472 DOI: 10.1158/1055-9965.epi-14-0680] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Several studies suggest that maternal folic acid supplementation before or during pregnancy protects against childhood acute lymphoblastic leukemia (ALL). We investigated associations between ALL risk and folate pathway gene polymorphisms, and their modification by maternal folic acid supplements, in a population-based case-control study (2003-2007). METHODS All Australian pediatric oncology centers provided cases; controls were recruited by national random digit dialing. Data from 392 cases and 535 controls were included. Seven folate pathway gene polymorphisms (MTHFR 677C>T, MTHFR 1298A>C, MTRR 66A>G, MTR 2756 A>G, MTR 5049 C>A, CBS 844 Ins68, and CBS 2199 T>C) were genotyped in children and their parents. Information on prepregnancy maternal folic acid supplement use was collected. ORs were estimated with unconditional logistic regression adjusted for frequency-matched variables and potential confounders. Case-parent trios were also analyzed. RESULTS There was some evidence of a reduced risk of ALL among children who had, or whose father had, the MTRR 66GG genotype: ORs 0.60 [95% confidence interval (CI) 0.39-0.91] and 0.64 (95% CI, 0.40-1.03), respectively. The ORs for paternal MTHFR 677CT and TT genotypes were 1.41 (95% CI, 1.02-1.93) and 1.81 (95% CI, 1.06-3.07). ORs varied little by maternal folic acid supplementation. CONCLUSIONS Some folate pathway gene polymorphisms in the child or a parent may influence ALL risk. While biologically plausible, underlying mechanisms for these associations need further elucidation. IMPACT Folate pathway polymorphisms may be related to risk of childhood ALL, but larger studies are needed for conclusive results.
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Affiliation(s)
- Elizabeth Milne
- Telethon Kids Institute, University of Western Australia, Perth, Western Australia, Australia.
| | - Kathryn R Greenop
- Telethon Kids Institute, University of Western Australia, Perth, Western Australia, Australia
| | - Rodney J Scott
- Hunter Medical Research Institute, John Hunter Hospital, New Lambton, New South Wales, Australia. School of Biomedical Sciences and Pharmacy, Faculty of Health, University of Newcastle, Newcastle, New South Wales, Australia. Hunter Area Pathology Service, HNEHealth, Newcastle, New South Wales, Australia
| | - Michelle Haber
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, University of New South Wales, Sydney, New South Wales, Australia
| | - Murray D Norris
- Children's Cancer Institute Australia for Medical Research, Lowy Cancer Research Centre, University of New South Wales, Sydney, New South Wales, Australia
| | - John Attia
- Hunter Medical Research Institute, John Hunter Hospital, New Lambton, New South Wales, Australia. School of Medicine and Public Health, Faculty of Health and Medicine, University of Newcastle, Newcastle, New South Wales, Australia
| | - Sarra E Jamieson
- Telethon Kids Institute, University of Western Australia, Perth, Western Australia, Australia
| | - Margaret Miller
- School of Exercise and Health Sciences, Edith Cowan University, Mount Lawley, Western Australia, Australia
| | - Carol Bower
- Telethon Kids Institute, University of Western Australia, Perth, Western Australia, Australia
| | - Helen D Bailey
- Telethon Kids Institute, University of Western Australia, Perth, Western Australia, Australia. Section of Environment and Radiation, International Agency for Research on Cancer, Lyon, France
| | - Somer Dawson
- Telethon Kids Institute, University of Western Australia, Perth, Western Australia, Australia
| | | | - Nicholas H de Klerk
- Telethon Kids Institute, University of Western Australia, Perth, Western Australia, Australia
| | - Frank M van Bockxmeer
- Department of Clinical Biochemistry, Royal Perth Hospital and the School of Surgery, University of Western Australia, Perth, Western Australia, Australia
| | - Bruce K Armstrong
- Sax Institute, Haymarket, New South Wales, Australia. Sydney School of Public Health, University of Sydney, Sydney, New South Wales, Australia
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Association of physical activity and polymorphisms in FGFR2 and DNA methylation related genes with breast cancer risk. Cancer Epidemiol 2014; 38:708-14. [DOI: 10.1016/j.canep.2014.09.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 08/31/2014] [Accepted: 09/07/2014] [Indexed: 11/21/2022]
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Bleich S, Semmler A, Frieling H, Thumfart L, Muschler M, Hillemacher T, Kornhuber J, Kallweit U, Simon M, Linnebank M. Genetic variants of methionine metabolism and DNA methylation. Epigenomics 2014; 6:585-91. [DOI: 10.2217/epi.14.54] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Aim: Altered DNA methylation is associated with important and common pathologies such as cancer. The origin of altered DNA methylation is unknown. The methyl groups for DNA methylation are provided by methionine metabolism. This metabolism is characterized by a high interindividual variability, which is in part explained by genetic variants. Methods: In a cohort of 313 individuals derived from a family-based study with index cases of cerebrovascular disease, we analyzed whether global methylation of leukocyte DNA was associated with age, gender, homocysteine plasma levels or functionally relevant genetic variants. Results: We observed an association of the G-allele of the methionine synthase variant c.2756A>G (D919G) with global methylation (% methylation ± 1 SD, AA: 41.3 ± 14.9; AG: 36.4 ± 18.2; GG: 30.8 ± 16.9; F = 4.799; p = 0.009). The methionine synthase variant c.2756A>G is associated with various types of cancer. Conclusion: Our data suggest that an impact on DNA methylation may contribute to the clinical relevance of the methionine synthase variant.
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Affiliation(s)
- Stefan Bleich
- Molecular Neuroscience Laboratory, Department of Psychiatry, Social Psychiatry & Psychotherapy, Hannover Medical School, Hannover, Germany
| | - Alexander Semmler
- Department of Neurology, University Hospital Zurich, Frauenklinikstrasse 26, 8091 Zurich, Switzerland
| | - Helge Frieling
- Molecular Neuroscience Laboratory, Department of Psychiatry, Social Psychiatry & Psychotherapy, Hannover Medical School, Hannover, Germany
| | - L Thumfart
- Molecular Neuroscience Laboratory, Department of Psychiatry, Social Psychiatry & Psychotherapy, Hannover Medical School, Hannover, Germany
| | - Marc Muschler
- Molecular Neuroscience Laboratory, Department of Psychiatry, Social Psychiatry & Psychotherapy, Hannover Medical School, Hannover, Germany
| | - Thomas Hillemacher
- Molecular Neuroscience Laboratory, Department of Psychiatry, Social Psychiatry & Psychotherapy, Hannover Medical School, Hannover, Germany
| | - Johannes Kornhuber
- Molecular Neuroscience Laboratory, Department of Psychiatry, Social Psychiatry & Psychotherapy, Hannover Medical School, Hannover, Germany
| | - Ulf Kallweit
- Department of Neurology, University Hospital Zurich, Frauenklinikstrasse 26, 8091 Zurich, Switzerland
| | - Matthias Simon
- Department of Neurosurgery, University Hospital Bonn, Bonn, Germany
| | - Michael Linnebank
- Department of Neurology, University Hospital Zurich, Frauenklinikstrasse 26, 8091 Zurich, Switzerland
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Associations of MTHFR C677T and MTRR A66G gene polymorphisms with metabolic syndrome: a case-control study in Northern China. Int J Mol Sci 2014; 15:21687-702. [PMID: 25429430 PMCID: PMC4284672 DOI: 10.3390/ijms151221687] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Revised: 11/03/2014] [Accepted: 11/12/2014] [Indexed: 11/17/2022] Open
Abstract
Prior evidence indicates that homocysteine plays a role in the development of metabolic syndrome (MetS). Methylenetetrahydrofolate reductase (MTHFR) C677T and methionine synthase reductase (MTRR) A66G polymorphisms are common genetic determinants of homocysteine levels. To investigate the associations of the MTHFR C677T and MTRR A66G polymorphisms with MetS, 692 Chinese Han subjects with MetS and 878 controls were recruited. The component traits of MetS and the MTHFR C677T and MTRR A66G genotypes were determined. A significant association was observed between the MTHFR 677T allele and increased risk of MetS, high fasting blood glucose, high waist circumference, and increasing number of MetS components. The MTRR A66G polymorphism was associated with an increased risk of MetS when combined with the MTHFR 677TT genotype, although there was no association found between MetS and MTRR A66G alone. Furthermore, the MTRR 66GG genotype was associated with high fasting blood glucose and triglycerides. Our data suggest that the MTHFR 677T allele may contribute to an increased risk of MetS in the northern Chinese Han population. The MTRR A66G polymorphism is not associated with MetS. However, it may exacerbate the effect of the MTHFR C677T variant alone. Further large prospective population-based studies are required to confirm our findings.
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Egbuniwe IC, Ayo JO, Kawu MU, Mohammed A. Cloacal temperature responses of broiler chickens administered with betaine and ascorbic acid during the hot-dry season. BIOL RHYTHM RES 2014. [DOI: 10.1080/09291016.2014.974931] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Folate-related polymorphisms in gastrointestinal stromal tumours: susceptibility and correlation with tumour characteristics and clinical outcome. Eur J Hum Genet 2014; 23:817-23. [PMID: 25227144 DOI: 10.1038/ejhg.2014.198] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 08/07/2014] [Accepted: 08/15/2014] [Indexed: 12/20/2022] Open
Abstract
The folate metabolism pathway has a crucial role in tumorigenesis as it supports numerous critical intracellular reactions, including DNA synthesis, repair, and methylation. Despite its importance, little is known about the influence of the folate pathway on gastrointestinal stromal tumour (GIST), a rare tumour with an incidence ranging between 6 and 19.6 cases per million worldwide. The importance of folate metabolism led us to investigate the influence of polymorphisms in the genes coding folate-metabolising enzymes on GIST susceptibility, tumour characteristics and clinical outcome. We investigated a panel of 13 polymorphisms in 8 genes in 60 cases and 153 controls. The TS 6-bp deletion allele (formerly rs34489327, delTInsTTAAAG) was associated with reduced risk of GIST (OR=0.20, 95% CI 0.05-0.67, P=0.0032). Selected polymorphisms in patients stratified by age, gender, and other main molecular and clinical characteristics showed that few genotypes may show a likely correlation. We also observed a significant association between the RFC AA/AG genotype and time to progression (HR=0.107, 95% CI 0.014-0.82; P=0.032). Furthermore, we observed a tendency towards an association between the SHMT1 variant allele (TT, rs1979277) and early death (HR=4.53, 95% CI 0.77-26.58, P=0.087). Aware of the strengths and limitations of the study, these results suggest that polymorphisms may modify the risk of GIST and clinical outcome, pointing to the necessity for further investigations with information on folate plasma levels and a larger study population.
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Abstract
PURPOSE OF REVIEW Nutrition exerts a pervasive impact on normal and pathological conditions of the nervous system. One critical pathway is the methionine cycle, in which folate and B12 convert homocysteine to methionine, which is in turn converted to S-adenosyl methionine (SAM; the major methyl donor). As a consequence of methylation, however, SAM is converted to the neurotoxin homocysteine and must be excreted or drawn back into the methionine cycle, which requires additional folate and B12. Dietary or genetic folate deficiency impairs this cycle, leading to developmental disorders, including those of the nervous system. RECENT FINDINGS Folate and SAM exert profound epigenetic effects via DNA and histone methylation. Maternal supplementation during pregnancy has fostered an increase in individuals harboring genetic polymorphisms that compromise folate usage. Such individuals harbor a lifetime requirement for additional dietary folate, often not met beyond peri/postnatal periods. Herein, we consider the potential link of failure to meet this additional requirement to early and age-related cognitive compromise. SUMMARY Compromises in the methionine cycle can manifest as a spectrum of disorders throughout life. These considerations underscore how prenatal nutritional supplementation can alleviate developmental disorders by inadvertently establishing latent conditions that, in the absence of continued supplementation, may lead to age-related cognitive decline.
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