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Hassan MH, Raslan MA, Tharwat M, Sakhr HM, El-Khateeb EES, Sakr SF, Ameen HH, Hamdan AR. Metabolic Analysis of Methylenetetrahydrofolate Reductase Single Nucleotide Polymorphisms (MTHFR 677C<T and MTHFR 1298A<C), Serum Folate and Vitamin B12 in Neural Tube Defects. Indian J Clin Biochem 2023; 38:305-315. [PMID: 37234187 PMCID: PMC10205924 DOI: 10.1007/s12291-022-01049-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 04/17/2022] [Indexed: 10/18/2022]
Abstract
Neural tube defects (NTDs) are among the most prevalent and debilitating birth defects with their causes are still unknown, despite mounting evidence that genetic and/or environmental factors may play a role. We aimed to analyze two single nucleotide polymorphisms of methylenetetrahydrofolate reductase (MTHFR) gene, serum folate and vitamin B12 status among a cohort of Egyptian children with NTDs and their mothers. A case-control study has been conducted on 50 Egyptian children with various types of NTDs and their mothers. They were comparable with 50 unrelated healthy, age and sex matched children and their mothers (50) selected as controls. Pediatric and neurosurgical assessments were performed to the included cases. Serum folate and vitamin B12 were measured using ELISA kits. MTHFR 677C
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Affiliation(s)
- Mohammed H. Hassan
- Department of Medical Biochemistry, Faculty of Medicine, South Valley University, Qena, 83523 Egypt
| | - Mohamed A. Raslan
- Department of Chemistry, Faculty of Science, Aswan University, Aswan, 81528 Egypt
| | - Mena Tharwat
- Department of Chemistry, Faculty of Science, Aswan University, Aswan, 81528 Egypt
| | - Hala M. Sakhr
- Department of Pediatrics, Faculty of Medicine, South Valley University, Qena, 83523 Egypt
| | | | - Shimaa Fathy Sakr
- Molecular Biology Unit, Medical Technology Center, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - Hesham H. Ameen
- Department of Clinical Pathology, Faculty of Medicine, Al-Azhar University (Assiut Branch), Assiut, Egypt
| | - Ali R. Hamdan
- Department of Neurosurgery, Faculty of Medicine, South Valley University, Qena, 83523 Egypt
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2
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Wang S, Zeng Y, He X, Liu F, Pei P, Zhang T. Folate-deficiency induced acyl-CoA synthetase short-chain family member 2 increases lysine crotonylome involved in neural tube defects. Front Mol Neurosci 2023; 15:1064509. [PMID: 36743291 PMCID: PMC9895841 DOI: 10.3389/fnmol.2022.1064509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Accepted: 12/28/2022] [Indexed: 01/22/2023] Open
Abstract
Maternal folate deficiency increases the risk of neural tube defects (NTDs), but the mechanism remains unclear. Here, we established a mouse model of NTDs via low folate diets combined with MTX-induced conditions. We found that a significant increase in butyrate acid was observed in mouse NTDs brains. In addition, aberrant key crotonyl-CoA-producing enzymes acyl-CoA synthetase short-chain family member 2 (ACSS2) levels and lysine crotonylation (Kcr) were elevated high in corresponding low folate content maternal serum samples from mouse NTD model. Next, proteomic analysis revealed that folate deficiency led to global proteomic modulation, especially in key crotonyl-CoA-producing enzymes, and dramatic ultrastructural changes in mouse embryonic stem cells (mESCs). Furthermore, we determined that folate deficiency induced ACSS2 and Kcr in mESCs. Surprisingly, folic acid supplementation restored level of ACSS2 and Kcr. We also investigated overall protein post-translational Kcr under folate deficiency, revealing the key regulation of Kcr in glycolysis/gluconeogenesis, and the citric acid cycle. Our findings suggest folate deficiency leads to the occurrence of NTDs by altering ACSS2. Protein crotonylation may be the molecular basis for NTDs remodeling by folate deficiency.
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Affiliation(s)
- Shan Wang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing, China,Capital Institute of Pediatrics-Peking University Teaching Hospital, Beijing, China,Graduate School of Peking Union Medical College, Capital Institute of Pediatrics, Beijing, China,*Correspondence: Shan Wang, ; Ting Zhang,
| | - Yubing Zeng
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing, China
| | - Xuejia He
- Capital Institute of Pediatrics-Peking University Teaching Hospital, Beijing, China
| | - Fan Liu
- Graduate School of Peking Union Medical College, Capital Institute of Pediatrics, Beijing, China
| | - Pei Pei
- 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,Capital Institute of Pediatrics-Peking University Teaching Hospital, Beijing, China,Graduate School of Peking Union Medical College, Capital Institute of Pediatrics, Beijing, China,*Correspondence: Shan Wang, ; Ting Zhang,
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3
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Pavlik R, Hecht S, Noss U, Soldin OP, Mendu RD, Soldin SJ, Lohse P, Thaler CJ. Reduced Steroid Synthesis in the Follicular Fluid of MTHFR 677TT Mutation Carriers: Effects of Increased Folic Acid Administration. Geburtshilfe Frauenheilkd 2022; 82:1074-1081. [PMID: 36186148 PMCID: PMC9525144 DOI: 10.1055/a-1791-9358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 07/24/2022] [Indexed: 10/27/2022] Open
Abstract
Objective To compare steroid profiles in the follicular fluid (FF) from women homozygous for the methylenetetrahydrofolate reductase (MTHFR) 677C>T mutation and wildtype controls and to correlate it with the folic acid administration scheme applied at the time of oocyte retrieval. Design Retrospective single center study. Subjects and Methods Infertile patients treated by using assisted reproductive techniques were genotyped routinely for the MTHFR 677C>T mutation. In 2006 they had received folic acid supplementation doses of 400 µg daily per os. This group was designated Group-400 (n = 10). From 2008 onwards, all of our infertility patients received a daily dose of 800 µg folic acid per os. Women from this group were designated Group-800 (n = 28). FF were collected and a panel of steroid hormones (estradiol, estrone, estriol, cortisol, progesterone, 17-OH progesterone, testosterone, androstenedione, aldosterone, DHEA, and DHEA-S) was measured by isotope dilution liquid chromatography-tandem mass spectrometry employing atmospheric pressure photo ionization (APPI). Results In Group-400, the FF hormone profile confirmed a significant reduction of estradiol in homozygous 677TT carriers (0.52 ± 0.08-fold, exact p = 0.032) and for the first time also revealed significantly reduced estriol concentrations in these individuals (0.54 ± 0.05-fold, p = 0.016), as compared to wildtype controls. In Group-800, no significant differences were found for concentrations of any of the steroid hormones between homozygous 677TT carriers and wildtype controls. Conclusions The current findings support and extend previous reports on reduced concentrations of specific steroid hormones in follicular fluids of homozygous MTHFR 677C>T mutation carriers. The restoration of the FF hormone profile by elevated-dose folic acid supplementation might impact performing ART in infertile women with the MTHFR 677TT-genotype. Further adequately powered studies are necessary to verify our finding and to demonstrate the clinical effect of enhanced folic supplementation on ovarian function.
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Affiliation(s)
- Roman Pavlik
- Department of Obstetrics and Gynecology and Center for Gynecological Endocrinology and Reproductive Medicine, University Hospital, Ludwig-Maximilians University, Munich,
Germany,TFP Fertility Wels, Wels, Austria
| | - Stephanie Hecht
- Department of Obstetrics and Gynecology and Center for Gynecological Endocrinology and Reproductive Medicine, University Hospital, Ludwig-Maximilians University, Munich,
Germany,Practice for Obstetrics and Gynecology, Erfurt, Germany
| | - Ulrich Noss
- Centre for Reproductive Medicine, Munich, Germany
| | - Offie P. Soldin
- Division of Endocrinology and Metabolism, Georgetown University Medical Center, Washington, D.C., USA
| | - Rao D. Mendu
- Division of Endocrinology and Metabolism, Georgetown University Medical Center, Washington, D.C., USA
| | - Steven J. Soldin
- Division of Endocrinology and Metabolism, Georgetown University Medical Center, Washington, D.C., USA
| | - Peter Lohse
- Department of Clinical Chemistry, University Hospital, Ludwig-Maximilians University, Munich, Germany
| | - Christian J. Thaler
- Department of Obstetrics and Gynecology and Center for Gynecological Endocrinology and Reproductive Medicine, University Hospital, Ludwig-Maximilians University, Munich,
Germany,Korrespondenzadresse Univ.-Prof. Dr. med. Christian J. Thaler, M.I.A.C., F.C.R.I. University Hospital, Ludwig-Maximilians University, Department of Obstetrics and
Gynecology and Center for Gynecological Endocrinology and Reproductive MedicineMarchioninistraße 1581377
MunichGermany
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Zhou Y, Crider KS, Yeung LF, Rose CE, Li Z, Berry RJ, Li S, Moore CA. Periconceptional folic acid use prevents both rare and common neural tube defects in China. Birth Defects Res 2022; 114:184-196. [PMID: 35098705 PMCID: PMC11091954 DOI: 10.1002/bdr2.1983] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 01/14/2022] [Accepted: 01/16/2022] [Indexed: 12/23/2022]
Abstract
BACKGROUND Neural tube defects (NTDs) encompass a variety of distinct types. We assessed if the preventive effect of folic acid (FA) varied by NTD type and infant sex. METHODS We examined all pregnancies with NTD status confirmation from a pregnancy-monitoring system in selected locations in northern and southern regions of China between 1993 and 1996. Women who took 400 μg of FA daily during 42 days after last menstrual period were considered FA users. We analyzed NTD prevalence by FA use status, NTD type, geographic region, and infant sex. RESULTS Among 626,042 pregnancies, 700 were affected by an NTD. Among FA nonusers, 65 pregnancies (8.8 per 10,000) in the north and 51 pregnancies (1.2 per 10,000) in the south were affected by one of the two rare NTDs, that is, craniorachischisis, iniencephaly. FA use prevented occurrence of these two rare NTDs and reduced the prevalence of spina bifida (SB) by 78% (from 17.9 to 3.9 per 10,000) in the north and 51% (from 2.4 to 1.2 per 10,000) in the south. Among FA users, SB prevalence, including SB with high lesion level, was significantly reduced in both geographic regions. FA use reduced prevalence of anencephaly and encephalocele by 85% and 50%, respectively in the north, while it did not reduce the prevalence of these two NTDs in the south. There was a greater reduction in NTD prevalence in female than in male infants and fetuses. CONCLUSIONS This is the first study to show that FA prevents the entire spectrum of NTD types.
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Affiliation(s)
- Ying Zhou
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Krista S. Crider
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Lorraine F. Yeung
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Charles E. Rose
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Zhu Li
- Institute of Reproductive and Child Health, School of Public Health, Peking University, Beijing, China
| | - Robert J. Berry
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Song Li
- Peking University Third Hospital, Beijing, China
| | - Cynthia A. Moore
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
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Soleimani-Jadidi S, Meibodi B, Javaheri A, Tabatabaei RS, Hadadan A, Zanbagh L, Abbasi H, Bahrami R, Mirjalili SR, Karimi-Zarchi M, Neamatzadeh H. Association between Fetal MTHFR A1298C (rs1801131) Polymorphism and Neural Tube Defects Risk: A Systematic Review and Meta-Analysis. Fetal Pediatr Pathol 2022; 41:116-133. [PMID: 32536231 DOI: 10.1080/15513815.2020.1764682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
BACKGROUND The association of the fetal MTHFR A1298C (rs1801131) polymorphism and neural tube defects (NTDs) susceptibility has been widely demonstrated, but the results remain inconclusive. Thus, we performed a meta-analysis to investigate the association between fetal MTHFR A1298C polymorphism and NTDs risk. METHODS An electronic search of PubMed, web of science, SciELO, CNKI database for studies on the fetal MTHFR A1298C polymorphism and NTDs risk was performed up to March 30, 2020. RESULTS A total of 22 case-control studies with 3,224 fetuses with NTDs and 3,295 controls were selected. Overall, pooled data showed that the fetal MTHFR A1298C polymorphism was not significantly associated with risk an increased risk of NTDs in the global population. When stratified analysis by ethnicity, country of origin and NTDs type, still no statistically significant association was found. CONCLUSIONS Our pooled data emerged no evidence for significant association between fetal MTHFR A1298C polymorphism and NTDs risk.
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Affiliation(s)
- Sara Soleimani-Jadidi
- Department of Obstetrics and Gynecology, Lorestan University of Medical Sciences, Lorestan, Iran
| | - Bahare Meibodi
- Department of Obstetrics and Gynecology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Atiyeh Javaheri
- Department of Obstetrics and Gynecology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Razieh Sadat Tabatabaei
- Department of Obstetrics and Gynecology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Amaneh Hadadan
- Department of Obstetrics and Gynecology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Leila Zanbagh
- Department of Obstetrics and Gynecology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Department of Obstetrics and Gynecology, Yazd Branch, Islamic Azad University, Yazd, Iran
| | - Hajar Abbasi
- Department of Obstetrics and Gynecology, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Reza Bahrami
- Neonatal Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Seyed Reza Mirjalili
- Department of Pediatrics, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Mother and Newborn Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mojgan Karimi-Zarchi
- Department of Obstetrics and Gynecology, Iran University of Medical Sciences, Tehran, Iran.,Endometriosis Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Hossein Neamatzadeh
- Mother and Newborn Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Department of Medical Genetics, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
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6
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Li Q, Xu L, Jia X, Saleem K, Zaib T, Sun W, Fu S. SNPs in folate pathway are associated with the risk of nonsyndromic cleft lip with or without cleft palate, a meta-analysis. Biosci Rep 2020; 40:BSR20194261. [PMID: 32124929 DOI: 10.1042/BSR20194261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 02/18/2020] [Accepted: 02/28/2020] [Indexed: 12/18/2022] Open
Abstract
Background: Prenatal intake of folic acid is important for prevention of NSCL/P (nonsyndromic cleft lip with or without cleft palate). Associated genes in folate pathway are major enzymes of folic acid metabolism that is crucial for preventing birth defects. The present meta-analysis aims to investigate the association between four SNPs in folate pathway genes and the risk of NSCL/P. Methods: Comprehensive bioinformatics analysis was used to predict the functional pathogenicity of genetic variation. The PubMed, Embase database and Google Scholar were searched by two researchers. Stata 11.0 software was used to analyze the results. Subgroup analysis was carried out to assess the influence of genetic background. Sensitivity analysis, regression analysis and publication analysis were also conducted to enhance the strength of our results. Results: It is estimated that the probability of two missense mutation rs1801133 in MTHFR and rs1801394 in MTRR are more likely to be damaging by bioinformatics analysis. A significant association between rs1801133 and risk of NSCL/P in two genetic models: TT genotype vs CC genotype (OR = 1.333 95%CI = 1.062–1.674, P = 0.013), and recessive model (OR = 1.325 95%CI = 1.075–1.634, P = 0.008). A significant protective association between rs1801394 GG genotype and NSCL/P in Asian (GG vs AA, OR = 0.520 95%CI = 0.321–0.841, P = 0.008) was observed. Meta-regression, sensitivity analysis, and publication bias analysis confirmed that the results of the present study were statistically significant. Conclusions: The present study identified that rs1801133 in MTHFR is associated with the risk of NSCL/P, and rs1801394 GG genotype in MTRR play a protective role in Asian. Further, larger studies should be performed to confirm these findings.
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7
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Pangilinan F, Finlay EK, Molloy AM, Abaan HO, Shane B, Mills JL, Brody LC, Parle-McDermott A. A dihydrofolate reductase 2 (DHFR2) variant is associated with risk of neural tube defects in an Irish cohort but not in a United Kingdom cohort. Am J Med Genet A 2021; 185:1307-1311. [PMID: 33544972 DOI: 10.1002/ajmg.a.62090] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 12/24/2020] [Indexed: 01/20/2023]
Affiliation(s)
- Faith Pangilinan
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, Maryland, USA
| | - Emma K Finlay
- School of Biotechnology, Dublin City University, Dublin, Ireland
| | - Anne M Molloy
- Department of Clinical Medicine, School of Medicine, Trinity College, Dublin, Ireland
| | - Hattice O Abaan
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, Maryland, USA
| | - Barry Shane
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, California, USA
| | - James L Mills
- Division of Intramural Population Health Research, Eunice Kennedy Shriver, National Institute for Child Health and Human Development, Bethesda, Maryland, USA
| | - Lawrence C Brody
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, Maryland, USA
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8
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Lascar EM, Warner NM, Doherty MJ. Pregnancy outcomes in women with epilepsy and MTHFR mutations supplemented with methylated folate and methylcobalamin (methylated B12). Epilepsy Behav Rep 2020; 15:100419. [PMID: 33426516 PMCID: PMC7776832 DOI: 10.1016/j.ebr.2020.100419] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 11/30/2020] [Accepted: 12/01/2020] [Indexed: 11/30/2022] Open
Abstract
Folate processing gene (MTHFR) defects are common in women with epilepsy (WWE) and mood disorders. Methylated versions of folate and B12 may bypass problems related to MTHFR gene processing. Successful pregnancies occurred in WWE with MTHFR defects when usinghenuse of these supplements.
Antiseizure medications (ASM) may contribute to adverse fetal outcomes in pregnant women with epilepsy (WWE). Folate processing (Methylenetetrahydrofolate reductase, MTHFR) gene abnormalities are common in women with epilepsy and depression. L-methylfolate supplements may bypass MTHFR deficiencies, yet their use in WWE during gestation or on fetal development is not well studied. We examine pregnancy histories of three WWE who supplemented with either folate or L-methylfolate and methylcobalamin (methylated B12) during pregnancies. Their pregnancy outcomes improved with L-methylfolate and methylcobalamin supplementation. L-methylfolate and methylcobalamin supplementation merits further study in WWE who have MTHFR mutations, fertility, recurrent miscarriage and or depression histories.
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Affiliation(s)
- Emma M Lascar
- Department of Neuroscience, University of Washington, 1953 Pacific Ave, Seattle, WA, USA.,Swedish Epilepsy Center, Swedish Hospital, Seattle, WA, USA
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Steele JW, Kim SE, Finnell RH. One-carbon metabolism and folate transporter genes: Do they factor prominently in the genetic etiology of neural tube defects? Biochimie 2020; 173:27-32. [PMID: 32061804 DOI: 10.1016/j.biochi.2020.02.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 02/11/2020] [Indexed: 01/20/2023]
Abstract
Neural tube defects (NTDs) are a broad class of congenital birth defects that result from the failure of neural tube closure during neurulation. Folic acid supplementation has been shown to prevent the occurrence of NTDs by as much as 70% in some human populations, and folate deficiency in a pregnant woman is associated with increased risk for having an NTD affected infant. Thus, folate transport-related genes and genes involved in the subsequent folate-mediated one-carbon metabolic pathway have long been considered primary candidates to study the genetic etiology of human NTDs. Herein, we review the genes involved in folate transport and one-carbon metabolism thus far identified as contributing variants that influence human NTD risk, and place these findings in the context of our evolving understanding of the complex genetic architecture underlying these defects.
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Affiliation(s)
- John W Steele
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, TX, 77030, USA; Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, TX, 78712, USA.
| | - Sung-Eun Kim
- Department of Pediatrics, The University of Texas at Austin/Dell Medical School, Austin, TX, 78723, USA.
| | - Richard H Finnell
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, TX, 77030, USA; Department of Molecular and Cellular Biology, Molecular and Human Genetics, and Medicine, Baylor College of Medicine, Houston, TX, 77030, USA.
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Abstract
Neural tube defects (NTD) are major congenital malformations affecting births worldwide. NTD are associated with life-long disability, significant medical care costs, and child mortality. Their prevalence varies worldwide. We conducted a review of published literature and surveillance systems to examine challenges in estimating an overall global prevalence estimate for NTD. Our review showed that most low- and middle-income countries do not track NTD and indicate a high prevalence of these malformations where data are available. Challenges in global NTD prevalence estimation include (1) quality of surveillance methods, (2) existing risk factors (including geographic or socioeconomic factors, availability and use of folic acid, and racial-ethnic and genetic factors), and (3) limitations in education and access to care. We recommend population-based surveillance systems tracking all pregnancy outcomes and major risk factors. Countries should invest in sustainable, multisource surveillance systems, in parallel to folic acid interventions, for gaining a more accurate knowledge of global prevalence of NTD than we currently have. Such efforts will assist in both global prevention of NTD and periodic evaluation of folic acid interventions for NTD reduction. Global NTD prevalence data can drive political will and accelerate the implementation and evaluation of NTD prevention programs.
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Affiliation(s)
- Vijaya Kancherla
- Department of Epidemiology, Emory University, Rollins School of Public Health, Atlanta, Georgia
| | - Robert E Black
- Department of International Health, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, Maryland
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Abstract
Despite unequivocal evidence that folate deficiency increases risk for human pathologies, and that folic acid intake among women of childbearing age markedly decreases risk for birth defects, definitive evidence for a causal biochemical pathway linking folate to disease and birth defect etiology remains elusive. The de novo and salvage pathways for thymidylate synthesis translocate to the nucleus of mammalian cells during S- and G2/M-phases of the cell cycle and associate with the DNA replication and repair machinery, which limits uracil misincorporation into DNA and genome instability. There is increasing evidence that impairments in nuclear de novo thymidylate synthesis occur in many pathologies resulting from impairments in one-carbon metabolism. Understanding the roles and regulation of nuclear de novo thymidylate synthesis and its relationship to genome stability will increase our understanding of the fundamental mechanisms underlying folate- and vitamin B12-associated pathologies.
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Affiliation(s)
- Martha S Field
- Division of Nutritional Sciences, Cornell University, Ithaca, New York 14853, USA;
| | - Elena Kamynina
- Division of Nutritional Sciences, Cornell University, Ithaca, New York 14853, USA;
| | - James Chon
- Graduate Field of Biochemistry, Molecular, and Cell Biology, Cornell University, Ithaca, New York 14853, USA
| | - Patrick J Stover
- College of Agriculture and Life Sciences, Texas A&M University, College Station, Texas 77843-2142, USA;
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12
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Graydon JS, Claudio K, Baker S, Kocherla M, Ferreira M, Roche-Lima A, Rodríguez-Maldonado J, Duconge J, Ruaño G. Ethnogeographic prevalence and implications of the 677C>T and 1298A>C MTHFR polymorphisms in US primary care populations. Biomark Med 2019; 13:649-661. [PMID: 31157538 PMCID: PMC6630484 DOI: 10.2217/bmm-2018-0392] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 03/25/2019] [Indexed: 02/04/2023] Open
Abstract
Aim: Variants of the MTHFR gene have been associated with a wide range of diseases. Materials & methods: The present study analyzed data from clinical genotyping of MTHFR 677C>T and 1298A>C in 1405 patients in urban primary care settings. Results: Striking differences in ethnogeographic frequencies of MTHFR polymorphisms were observed. African-Americans appear to be protected from MTHFR deficiency. Hispanics and Caucasians may be at elevated risk due to increased frequencies of 677C>T and 1298A>C, respectively. Conclusion: Individuals carrying mutations for both genes were rare and doubly homozygous mutants were absent, suggesting the TTcc is extremely rare in the greater population. The results suggest multilocus MTHFR genotyping may yield deeper insight into the ethnogeographic association between MTHFR variants and disease.
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Affiliation(s)
- James S Graydon
- Laboratory of Personalized Health, Genomas, Inc., Hartford, CT 06102, USA
| | - Karla Claudio
- Pharmaceutical Sciences department, University of Puerto Rico School of Pharmacy, San Juan, PR 00936, USA
| | - Seth Baker
- Clinical Laboratory Partners, Hartford Healthcare, Hartford, CT 06102, USA
| | - Mohan Kocherla
- Laboratory of Personalized Health, Genomas, Inc., Hartford, CT 06102, USA
| | - Mark Ferreira
- Laboratory of Personalized Health, Genomas, Inc., Hartford, CT 06102, USA
| | - Abiel Roche-Lima
- Center for Collaborative Research in Health Disparities, University of Puerto Rico School of Medicine, San Juan, PR 00936, USA
| | - Jovaniel Rodríguez-Maldonado
- Center for Collaborative Research in Health Disparities, University of Puerto Rico School of Medicine, San Juan, PR 00936, USA
| | - Jorge Duconge
- Pharmaceutical Sciences department, University of Puerto Rico School of Pharmacy, San Juan, PR 00936, USA
| | - Gualberto Ruaño
- Laboratory of Personalized Health, Genomas, Inc., Hartford, CT 06102, USA
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Chen MY, Rose CE, Qi YP, Williams JL, Yeung LF, Berry RJ, Hao L, Cannon MJ, Crider KS. Defining the plasma folate concentration associated with the red blood cell folate concentration threshold for optimal neural tube defects prevention: a population-based, randomized trial of folic acid supplementation. Am J Clin Nutr 2019; 109:1452-1461. [PMID: 31005964 PMCID: PMC7099800 DOI: 10.1093/ajcn/nqz027] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 01/29/2019] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND For women of reproductive age, a population-level red blood cell (RBC) folate concentration below the threshold 906 nmol/L or 400 ng/mL indicates folate insufficiency and suboptimal neural tube defect (NTD) prevention. A corresponding population plasma/serum folate concentration threshold for optimal NTD prevention has not been established. OBJECTIVE The aim of this study was to examine the association between plasma and RBC folate concentrations and estimated a population plasma folate insufficiency threshold (pf-IT) corresponding to the RBC folate insufficiency threshold (RBCf-IT) of 906 nmol/L. METHODS We analyzed data on women of reproductive age (n = 1673) who participated in a population-based, randomized folic acid supplementation trial in northern China. Of these women, 565 women with anemia and/or vitamin B-12 deficiency were ineligible for folic acid intervention (nonintervention group); the other 1108 received folic acid supplementation for 6 mo (intervention group). We developed a Bayesian linear model to estimate the pf-IT corresponding to RBCf-IT by time from supplementation initiation, folic acid dosage, methyltetrahydrofolate reductase (MTHFR) genotype, body mass index (BMI), vitamin B-12 status, or anemia status. RESULTS Using plasma and RBC folate concentrations of the intervention group, the estimated median pf-IT was 25.5 nmol/L (95% credible interval: 24.6, 26.4). The median pf-ITs were similar between the baseline and postsupplementation samples (25.7 compared with 25.2 nmol/L) but differed moderately (±3-4 nmol/L) by MTHFR genotype and BMI. Using the full population-based baseline sample (intervention and nonintervention), the median pf-IT was higher for women with vitamin B-12 deficiency (34.6 nmol/L) and marginal deficiency (29.8 nmol/L) compared with the sufficient group (25.6 nmol/L). CONCLUSIONS The relation between RBC and plasma folate concentrations was modified by BMI and genotype and substantially by low plasma vitamin B-12. This suggests that the threshold of 25.5 nmol/L for optimal NTD prevention may be appropriate in populations with similar characteristics, but it should not be used in vitamin B-12 insufficient populations. This trial was registered at clinicaltrials.gov as NCT00207558.
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Affiliation(s)
- Meng-Yu Chen
- Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, GA,National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA
| | - Charles E Rose
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA
| | - Yan Ping Qi
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA
| | - Jennifer L Williams
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA
| | - Lorraine F Yeung
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA
| | - Robert J Berry
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA
| | - Ling Hao
- China Office, Centers for Disease Control and Prevention, US Embassy, Beijing, China
| | - Michael J Cannon
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA
| | - Krista S Crider
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA
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Cai CQ, Fang YL, Shu JB, Zhao LS, Zhang RP, Cao LR, Wang YZ, Zhi XF, Cui HL, Shi OY, Liu W. Association of neural tube defects with maternal alterations and genetic polymorphisms in one-carbon metabolic pathway. Ital J Pediatr 2019; 45:37. [PMID: 30867013 PMCID: PMC6416842 DOI: 10.1186/s13052-019-0630-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 03/04/2019] [Indexed: 02/06/2023] Open
Abstract
Background Neural tube defects (NTDs) are birth defects of the brain, spine, or spinal cord invoked by the insufficient intake of folic acid in the early stages of pregnancy and have a complex etiology involving both genetic and environmental factors. So the study aimed to explore the association between alterations in maternal one-carbon metabolism and NTDs in the offspring. Methods We conducted a case-control study to get a deeper insight into this association, as well as into the role of genetic polymorphisms. Plasma concentrations of folate, homocysteine (Hcy), S-adenosylmethionine (SAM), S-adenosylhomocysteine (SAH) and genotypes and alleles distributions of 52 SNPs in 8 genes were compared for 61 women with NTDs-affected offspring and 61 women with healthy ones. Results There were significant differences between groups with regard to plasma folate, SAM, SAH and SAM/SAH levels. Logistic regression results revealed a significant association between maternal plasma folate level and risk of NTDs in the offspring. For MTHFD1 rs2236225 polymorphism, mothers having GA genotype and A allele exhibited an increased risk of NTDs in the offspring (OR = 2.600, 95%CI: 1.227–5.529; OR = 1.847, 95%CI: 1.047–3.259). For MTHFR rs1801133 polymorphism, mothers having TT and CT genotypes were more likely to affect NTDs in the offspring (OR = 4.105, 95%CI: 1.271–13.258; OR = 3.333, 95%CI: 1.068–10.400). Moreover, mothers carrying T allele had a higher risk of NTDs in the offspring (OR = 1.798, 95%CI: 1.070–3.021). For MTRR rs1801394 polymorphism, the frequency of G allele was significantly higher in cases than in controls (OR = 1.763, 95%CI: 1.023–3.036). Mothers with NTDs-affected children had higher AG genotype in RFC1 rs1051226 polymorphism than controls, manifesting an increased risk for NTDs (OR = 3.923, 95%CI: 1.361–11.308). Conclusion Folic acid deficiency, MTHFD1 rs2236225, MTHFR rs1801133, MTRR rs1801349 and RFC1 rs1051226 polymorphisms may be maternal risk factors of NTDs.
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Affiliation(s)
- Chun-Quan Cai
- College of Management and Economics, Tianjin University, No.92 Weijin Road, Tianjin, 300072, China.,Department of Neurosurgery, Tianjin Children's Hospital, No.238 Longyan Road, Beichen District, Tianjin, 300134, China
| | - Yu-Lian Fang
- Institute of Pediatrics, Tianjin Children's Hospital, No.238 Longyan Road, Beichen District, Tianjin, 300134, China
| | - Jian-Bo Shu
- Institute of Pediatrics, Tianjin Children's Hospital, No.238 Longyan Road, Beichen District, Tianjin, 300134, China
| | - Lin-Sheng Zhao
- Department of Pathology, Tianjin Children's Hospital, No.238 Longyan Road, Beichen District, Tianjin, 300134, China
| | - Rui-Ping Zhang
- Department of Pediatrics, Tianjin Children's Hospital, No.238 Longyan Road, Beichen District, Tianjin, 300134, China
| | - Li-Rong Cao
- Graduate School of Tianjin Medical University, No.22 Qixiangtai Road, Heping District, Tianjin, 300070, China
| | - Yi-Zheng Wang
- Graduate School of Tianjin Medical University, No.22 Qixiangtai Road, Heping District, Tianjin, 300070, China
| | - Xiu-Fang Zhi
- Graduate School of Tianjin Medical University, No.22 Qixiangtai Road, Heping District, Tianjin, 300070, China
| | - Hua-Lei Cui
- Department of Surgery, Tianjin Children's Hospital, No.238 Longyan Road, Beichen District, Tianjin, 300134, China
| | - Ou-Yan Shi
- School of Basic Medical Sciences, Tianjin Medical University, No.22 Qixiangtai Road, Heping District, Tianjin, 300070, China.
| | - Wei Liu
- Department of Pediatrics, Tianjin Children's Hospital, No.238 Longyan Road, Beichen District, Tianjin, 300134, China.
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Beaumont M, Akloul L, Carré W, Quélin C, Journel H, Pasquier L, Fradin M, Odent S, Hamdi-rozé H, Watrin E, Dupé V, Dubourg C, David V. Targeted panel sequencing establishes the implication of planar cell polarity pathway and involves new candidate genes in neural tube defect disorders. Hum Genet 2019; 138:363-74. [DOI: 10.1007/s00439-019-01993-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 02/26/2019] [Indexed: 01/18/2023]
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Zhang Y, He X, Xiong X, Chuan J, Zhong L, Chen G, Yu D. The association between maternal methylenetetrahydrofolate reductase C677T and A1298C polymorphism and birth defects and adverse pregnancy outcomes. Prenat Diagn 2018; 39:3-9. [PMID: 30474229 DOI: 10.1002/pd.5396] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 11/18/2018] [Accepted: 11/21/2018] [Indexed: 01/03/2023]
Abstract
Published studies indicate the MTHFR C677T and A1298C polymorphisms are associated with abnormal homocysteine levels, which may cause various pregnancy complications and birth defects. However, the results obtained from different studies have been inconsistent. Therefore, this meta-analysis explores the association between MTHFR polymorphisms and birth defects and adverse pregnancy outcomes. The PubMed, ScienceDirect, Embase, and China Biology Medicine literature databases and ClinicalTrials were searched. Analyses of public bias, meta-regression, subgroups, and sensitivity were used to ensure the robustness of our results. MTHFR C677T was significantly associated with recurrent pregnancy loss in developing countries (odds ratio [OR], 1.34; 95% confidence interval [CI], 1.20-1.50) but not in developed countries (OR, 0.87; 95% CI, 0.68-1.11). No significant relationship was found between MTHFR A1298C and recurrent pregnancy loss (OR, 1.04; 95% CI, 0.93-1.18). MTHFR C677T and A1298C were not associated with preeclampsia (OR, 1.06; 95% CI, 0.97-1.16 and OR, 1.16; 95% CI, 0.97-1.39, respectively), and C677T was not associated with placental abruption (OR, 1.03; 95% CI, 0.87-1.21), intrauterine growth retardation (OR, 1.02; 95% CI, 0.90-1.15), or congenital heart disease (OR, 1.05; 95% CI, 0.89-1.25). MTHFR C677T, but not A1298C, was associated with neural tube defects (OR, 1.24; 95% CI, 1.08-1.42) and Down syndrome (OR, 1.65; 95% CI, 1.39-1.95). CONCLUSION: Although MTHFR C677T and A1298C are significantly associated with some types of congenital defects and adverse pregnancy outcomes, the impact of these polymorphisms is moderate.
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Affiliation(s)
- Yuan Zhang
- Personalized Drug Therapy Key Laboratory of Sichuan Province, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, PR China
| | - Xia He
- Personalized Drug Therapy Key Laboratory of Sichuan Province, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, PR China
| | - Xuan Xiong
- Personalized Drug Therapy Key Laboratory of Sichuan Province, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, PR China
| | - Junlan Chuan
- Personalized Drug Therapy Key Laboratory of Sichuan Province, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, PR China
| | - Lei Zhong
- Personalized Drug Therapy Key Laboratory of Sichuan Province, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, PR China
| | - Guo Chen
- Department of Geriatrics, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, PR China
| | - Dongke Yu
- Personalized Drug Therapy Key Laboratory of Sichuan Province, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, PR China
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Lei W, Xia Y, Wu Y, Fu G, Ren A. Associations Between MTR A2756G, MTRR A66G, and TCN2 C776G Polymorphisms and Risk of Nonsyndromic Cleft Lip With or Without Cleft Palate: A Meta-Analysis. Genet Test Mol Biomarkers 2018; 22:465-473. [PMID: 30004262 DOI: 10.1089/gtmb.2018.0037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
OBJECTIVE We conducted a meta-analysis to investigate the associations of methionine synthase (MTR) A2756G, methionine synthase reductase (MTRR) A66G, and transcobalamin 2 (TCN2) C776G gene polymorphisms with nonsyndromic cleft lip with or without cleft palate (NSCL/P). MATERIALS AND METHODS The PubMed, Web of Science, Embase, and Wiley Online Library databases and the China Biomedical Literature Service System (SinoMed) were searched for relevant articles to explore the associations between the MTR A2756G, MTRR A66G, and TCN2 C776G polymorphisms and the risk of NSCL/P. We performed overall comparisons and stratified analyses according to the ethnicity, type of NSCL/P, and Hardy-Weinberg equilibrium (HWE) of the control group. Pooled odds ratios (ORs) and 95% confidence intervals (CIs) were applied to estimate the associations of these gene polymorphisms with NSCL/P risk using fixed-effects or random-effects models incorporating five genetic models. RESULTS Ultimately, 12 articles were included in this study. The pooled results did not reveal a significant association of the MTR A2756G polymorphism with NSCL/P risk (G vs. A: OR = 0.95, 95% CI = 0.82-1.11, p = 0.55). Similar results were observed for the MTRR A66G polymorphism (G vs. A: OR = 0.99, 95% CI = 0.82-1.18, p = 0.72) and the TCN2 C776G polymorphism (G vs. C: OR = 0.95, 95% CI = 0.86-1.06, p = 0.37). CONCLUSION In summary, the MTR A2756G, MTRR A66G, and TCN2 C776G polymorphisms might not be associated with NSCL/P risk.
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Affiliation(s)
- Wei Lei
- 1 Department of Orthodontics, Stomatological Hospital of Chongqing Medical University , Chongqing, China .,2 Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences , Chongqing, China .,3 Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing , China
| | - Yinlan Xia
- 1 Department of Orthodontics, Stomatological Hospital of Chongqing Medical University , Chongqing, China .,2 Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences , Chongqing, China .,3 Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing , China
| | - Yang Wu
- 1 Department of Orthodontics, Stomatological Hospital of Chongqing Medical University , Chongqing, China .,2 Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences , Chongqing, China .,3 Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing , China
| | - Gang Fu
- 1 Department of Orthodontics, Stomatological Hospital of Chongqing Medical University , Chongqing, China .,2 Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences , Chongqing, China .,3 Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing , China
| | - Aishu Ren
- 1 Department of Orthodontics, Stomatological Hospital of Chongqing Medical University , Chongqing, China .,2 Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences , Chongqing, China .,3 Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing , China
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Abbasi IHR, Abbasi F, Wang L, Abd El Hack ME, Swelum AA, Hao R, Yao J, Cao Y. Folate promotes S-adenosyl methionine reactions and the microbial methylation cycle and boosts ruminants production and reproduction. AMB Express 2018; 8:65. [PMID: 29687201 PMCID: PMC5913057 DOI: 10.1186/s13568-018-0592-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 04/13/2018] [Indexed: 12/14/2022] Open
Abstract
Folate has gained significant attention due to its vital role in biological methylation and epigenetic machinery. Folate, or vitamin (B9), is only produced through a de novo mechanism by plants and micro-organisms in the rumen of mature animals. Although limited research has been conducted on folate in ruminants, it has been noted that ruminal synthesis could not maintain folate levels in high yielding dairy animals. Folate has an essential role in one-carbon metabolism and is a strong antiproliferative agent. Folate increases DNA stability, being crucial for DNA synthesis and repair, the methylation cycle, and preventing oxidation of DNA by free radicals. Folate is also critical for cell division, metabolism of proteins, synthesis of purine and pyrimidine, and increasing the de novo delivery of methyl groups and S-adenosylmethionine. However, in ruminants, metabolism of B12 and B9 vitamins are closely connected and utilization of folate by cells is significantly affected by B12 vitamin concentration. Supplementation of folate through diet, particularly in early lactation, enhanced metabolic efficiency, lactational performance, and nutritional quality of milk. Impaired absorption, oxidative degradation, or deficient supply of folate in ruminants affects DNA stability, cell division, homocysteine remethylation to methionine, de novo synthesis of S-adenosylmethionine, and increases DNA hypomethylation, uracil misincorporation into DNA, chromosomal damage, abnormal cell growth, oxidative species, premature birth, low calf weight, placental tube defects, and decreases production and reproduction of ruminant animals. However, more studies are needed to overcome these problems and reduce enormous dietary supplement waste and impaired absorption of folate in ruminants. This review was aimed to highlight the vital role of folic acid in ruminants performance.
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Cao L, Wang Y, Zhang R, Dong L, Cui H, Fang Y, Zhao L, Shi O, Cai C. Association of neural tube defects with gene polymorphisms in one-carbon metabolic pathway. Childs Nerv Syst 2018; 34:277-284. [PMID: 28770393 DOI: 10.1007/s00381-017-3558-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 07/20/2017] [Indexed: 12/19/2022]
Abstract
PURPOSE Neural tube defects (NTDs) are common congenital malformations. In this study, we aimed to explore the association between single nucleotide polymorphisms (SNPs) related to one-carbon metabolism (OCM) and NTDs in Han population of Northern China. METHODS A case-control study was conducted in 152 children with NTDs and 169 controls. Twenty-nine SNPs in five genes were genotyped by Sequenom MassARRAY technology, and haplotype analysis was done by Haploview4.2 software. RESULTS The allele frequency of rs3733890 in betaine-homocysteine methyltransferase (BHMT) gene was statistically different between NTDs and control groups (P = 0.041), and the children with A allele had higher risk for NTDs than G allele (OR = 1.408, 95%CI 1.013-1.956). In addition, there was a statistical difference in the allele and genotype frequencies of rs1051266 in reduced folate carrier1 (RFC1) gene between cases and controls (P = 0.013, 0.034), and the risk for NTDs was also higher in children with G allele and GG genotype, compared with A allele and AA genotype, respectively (OR = 1.492, 95%CI 1.089-2.044; OR = 2.020, 95%CI 1.081-3.780). The statistical significant difference was also found in allele frequency of rs1805087 in methionine synthetase (MTR) gene between cases and controls (P = 0.031), and the children with G allele were associated with an increased NTDs risk, compared with A allele (OR = 1.664, 95%CI 1.045-2.647). Meanwhile, haplotype analysis showed C-A-A-A haplotype of BHMT, and G-G-G-T haplotype of RFC1 was correlated with an increased risk of NTDs, but C-G-A-A haplotype of BHMT and G-G-C-A haplotype of MTR might decrease the risk of NTDs. CONCLUSIONS The BHMT gene rs3733890, RFC1 gene rs1051266 and MTR gene rs1805087 were associated with the occurrence of NTDs in Han population of Northern China. It was confirmed that the gene variation related to OCM was one of the susceptibility factors for NTDs.
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Affiliation(s)
- Lirong Cao
- Graduate college of Tianjin Medical University, Heping District, Tianjin, 300070, China
| | - Yizheng Wang
- Graduate college of Tianjin Medical University, Heping District, Tianjin, 300070, China
| | - Ruiping Zhang
- Graduate college of Tianjin Medical University, Heping District, Tianjin, 300070, China
| | - Liang Dong
- Department of surgery, Tianjin Children's Hospital, Beichen District, Tianjin, 300134, China
| | - Hualei Cui
- Department of surgery, Tianjin Children's Hospital, Beichen District, Tianjin, 300134, China
| | - Yulian Fang
- Institute of pediatric, Tianjin Children's Hospital, Beichen District, Tianjin, 300134, China
| | - Linsheng Zhao
- Department of pathology, Tianjin Children's Hospital, Beichen District, Tianjin, 300134, China
| | - Ouyan Shi
- School of Basic Medical Sciences, Tianjin Medical University, Heping District, Tianjin, 300070, China.
| | - Chunquan Cai
- Department of neurosurgery, Tianjin Children's Hospital, Beichen District, Tianjin, 300134, China.
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Bailey LB, Hausman DB. Folate status in women of reproductive age as basis of neural tube defect risk assessment. Ann N Y Acad Sci 2017; 1414:82-95. [PMID: 29139138 DOI: 10.1111/nyas.13511] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 08/31/2017] [Accepted: 09/09/2017] [Indexed: 12/31/2022]
Abstract
Reliable folate status data for women of reproductive age (WRA) to assess global risk for neural tube defects (NTDs) are needed. We focus on a recent recommendation by the World Health Organization that a specific "optimal" red blood cell (RBC) folate concentration be used as the sole indicator of NTD risk within a population and discuss how to best apply this guidance to reach the goal of assessing NTD risk globally. We also emphasize the importance of using the microbiologic assay (MBA) as the most reliable assay for obtaining comparable results for RBC folate concentration across time and countries, the need for harmonization of the MBA through use of consistent key reagents and procedures within laboratories, and the requirement to apply assay-matched cutoffs for folate deficiency and insufficiency. To estimate NTD risk globally, the ideal scenario would be to have country-specific population-based surveys of RBC folate in WRA determined utilizing a harmonized MBA, as was done in recent studies in Guatemala and Belize. We conclude with guidance on next steps to best navigate the road map toward the goal of generating reliable folate status data on which to assess NTD risk in WRA in low- and middle-income countries.
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Affiliation(s)
- Lynn B Bailey
- Department of Foods and Nutrition, College of Family and Consumer Sciences, University of Georgia, Athens, Georgia
| | - Dorothy B Hausman
- Department of Foods and Nutrition, College of Family and Consumer Sciences, University of Georgia, Athens, Georgia
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Findley TO, Tenpenny JC, O'Byrne MR, Morrison AC, Hixson JE, Northrup H, Au KS. Mutations in folate transporter genes and risk for human myelomeningocele. Am J Med Genet A 2017; 173:2973-2984. [PMID: 28948692 DOI: 10.1002/ajmg.a.38472] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 07/21/2017] [Accepted: 08/21/2017] [Indexed: 11/09/2022]
Abstract
The molecular mechanisms linking folate deficiency and neural tube defect (NTD) risk in offspring remain unclear. Folate transporters (SLC19A1, SLC46A1, SLC25A32, and FOLH1) and folate receptors (FOLR1, FOLR2, and FOLR3) are suggested to play essential roles in transporting folate from maternal intestinal lumen to the developing embryo. Loss of function variants in these genes may affect folate availability and contribute to NTD risk. This study examines whether variants within the folate transporter and receptor genes are associated with an increased risk for myelomeningocele (MM). Exons and their flanking intron sequences of 348 MM subjects were sequenced using the Sanger sequencing method and/or next generation sequencing to identify variants. Frequencies of alleles of single nucleotide polymorphisms (SNPs) in MM subjects were compared to those from ethnically matched reference populations to evaluate alleles' associated risk for MM. We identified eight novel variants in SLC19A1 and twelve novel variants in FOLR1, FOLR2, and FOLR3. Pathogenic variants include c.1265delG in SLC19A1 resulting in an early stop codon, four large insertion deletion variants in FOLR3, and a stop_gain variant in FOLR3. No new variants were identified in SLC46A1, SLC25A32, or FOLH1. In SLC19A1, c.80A>G (rs1051266) was not associated with our MM cohort; we did observe a variant allele G frequency of 61.7%, higher than previously reported in other NTD populations. In conclusion, we discovered novel loss of function variants in genes involved in folate transport in MM subjects. Our results support the growing evidence of associations between genes involved in folate transport and susceptibility to NTDs.
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Affiliation(s)
- Tina O Findley
- Division of Neonatology, The University of Texas Health Science Center at Houston, Houston, Texas
| | - Joy C Tenpenny
- Division of Neonatology, The University of Texas Health Science Center at Houston, Houston, Texas
| | - Michelle R O'Byrne
- Division of Medical Genetics, Department of Pediatrics, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, Texas
| | - Alanna C Morrison
- Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, The University of Texas Health Science Center at Houston, Houston, Texas
| | - James E Hixson
- Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, The University of Texas Health Science Center at Houston, Houston, Texas
| | - Hope Northrup
- Division of Medical Genetics, Department of Pediatrics, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, Texas.,Shriners Hospital for Children, Houston, Texas
| | - Kit Sing Au
- Division of Medical Genetics, Department of Pediatrics, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, Texas
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Abstract
Neural tube defects (NTDs) are the most severe congenital malformations of the central nervous system. The etiology is complex, with both genetic and environmental factors having important contributions. Researchers have known for the past two decades that maternal periconceptional use of the B vitamin folic acid can prevent many NTDs. Though this finding is arguably one of the most important recent discoveries in birth defect research, the mechanism by which folic acid exerts this benefit remains unknown. Research to date has focused on the hypothesis that an underlying genetic susceptibility interacts with folate-sensitive metabolic processes at the time of neural tube closure. Little progress has been made searching for risk-causative variants in candidate genes; therefore, more complex genetic and epigenetic methodologies are now being considered. This article reviews the research to date that has been targeted on this important gene-nutrient locus.
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Affiliation(s)
- Anne M Molloy
- School of Medicine and School of Biochemistry and Immunology, Trinity College Dublin, The University of Dublin, 2 Ireland;
| | - Faith Pangilinan
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, Maryland 20892; ,
| | - Lawrence C Brody
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, Maryland 20892; ,
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Burdennyy AM, Loginov VI, Zavarykina TM, Braga EA, Kubatiev AA. The role of molecular genetic alterations in genes involved in folate and homocysteine metabolism in multifactorial diseases pathogenesis. RUSS J GENET+ 2017. [DOI: 10.1134/s1022795417040044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Lemay P, De Marco P, Emond A, Spiegelman D, Dionne-Laporte A, Laurent S, Merello E, Accogli A, Rouleau GA, Capra V, Kibar Z. Rare deleterious variants in GRHL3 are associated with human spina bifida. Hum Mutat 2017; 38:716-724. [PMID: 28276201 DOI: 10.1002/humu.23214] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 02/21/2017] [Accepted: 03/04/2017] [Indexed: 01/13/2023]
Abstract
Neural tube defects, including spina bifida, are among the most common birth defects caused by failure of neural tube closure during development. They have a complex etiology involving largely undetermined environmental and genetic factors. Previous studies in mouse models have implicated the transcription factor Grhl3 as an important factor in the pathogenesis of spina bifida. In the present study, we conducted a resequencing analysis of GRHL3 in a cohort of 233 familial and sporadic cases of spina bifida. We identified two novel truncating variants: one homozygous frameshift variant, p.Asp16Aspfs*10, in two affected siblings and one heterozygous intronic splicing variant, p.Ala318Glyfs*26. We also identified five missense variants, one of which was demonstrated to reduce the activation of gene targets in a luciferase reporter assay. With the previously identified p.Arg391Cys variant, eight variants were found in GRHL3. Comparison of the variant rate between our cohort and the ExAC database identified a significant enrichment of deleterious variants in GRHL3 in the whole gene and the transactivation region in spina bifida patients. These data provide strong evidence for a role of GRHL3 as a predisposing factor to spina bifida and will help dissect the complex etiology and pathogenic mechanisms of these malformations.
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Affiliation(s)
- Philippe Lemay
- CHU Sainte Justine Research Center and University of Montréal, Montréal, Québec, Canada
| | | | - Alexandre Emond
- CHU Sainte Justine Research Center and University of Montréal, Montréal, Québec, Canada
| | - Dan Spiegelman
- Montreal Neurological Institute, McGill University, Montréal, Québec, Canada
| | | | - Sandra Laurent
- Montreal Neurological Institute, McGill University, Montréal, Québec, Canada
| | - Elisa Merello
- U.O. Neurochirurgia, Istituto Giannina Gaslini, Genova, Italy
| | - Andrea Accogli
- U.O. Neurochirurgia, Istituto Giannina Gaslini, Genova, Italy
| | - Guy A Rouleau
- Montreal Neurological Institute, McGill University, Montréal, Québec, Canada
| | - Valeria Capra
- U.O. Neurochirurgia, Istituto Giannina Gaslini, Genova, Italy
| | - Zoha Kibar
- CHU Sainte Justine Research Center and University of Montréal, Montréal, Québec, Canada
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Dutta HK, Borbora D, Baruah M, Narain K. Evidence of gene-gene interactions between MTHFD1 and MTHFR in relation to anterior encephalocele susceptibility in Northeast India. Birth Defects Res 2017; 109:432-444. [PMID: 28398708 DOI: 10.1002/bdra.23607] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 11/05/2016] [Accepted: 11/20/2016] [Indexed: 11/11/2022]
Abstract
BACKGROUND Anterior encephalocele (AE) is a rare congenital anomaly of the central nervous system which is thought to be associated with genetic defects in folate metabolism. METHODS This case-control study investigated the interactions of methylenetetrahydrofolate dehydrogenase 1 (MTHFD1)-1958G>A (rs2236225) and the methylenetetrahydrofolate reductase (MTHFR) - 677C>T (rs1801133) and 1298A>C (rs1801131) polymorphisms with the risk of AE in the Northeast Indian population. A total of 40 AE cases and 80 controls were investigated using polymerase chain reaction-restriction fragment length polymorphism technique. RESULTS MTHFR 1298CC was significantly associated with AE risk (odds ratio [OR] 4.21; p = 0.01). The MTHFR haplotypes 677C-1298C/677T-1298A (OR, 2.50) and 677T-1298C (OR, 2.86) conferred risk in a progressive manner (χ2 = 9.82; p < 0.01). MTHFD1 1958G>A was not associated with disease susceptibility. Children with the rs2236225 GA and the rs1801131 CC genotypes were at an increased risk as compared to the reference genotype of rs2236225 GG and rs1801131 AA (OR, 14.4; p = 0.02). Children with the rs2236225 GG and rs1801133 CT genotypes were also at an elevated risk (OR, 4.76; p = 0.01). The MTHFD1 polymorphism together with the MTHFR haplotypes elevated risk in a progressive manner (χ2 = 6.29; p = 0.01). CONCLUSION The data support our hypothesis of gene-gene interaction between MTHFD1 and MTHFR and the risk of AE. Together with the MTHFR haplotypes, MTHFD1 elevates risk in a progressive manner. The minor allelic frequencies of the MTHFD1 1958G>A and MTHFR 1298A>C in our populations were similar to those reported from Southeast Asian population, suggesting a possible explanation for the prevalence of this malformation in these regions. Birth Defects Research 109:432-444, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Hemonta Kr Dutta
- Department of Pediatric Surgery, Assam Medical College & Hospital, Dibrugarh, Assam, India
| | - Debasish Borbora
- Department of Biotechnology, Gauhati University, Guwahati, Assam, India
| | - Mauchumi Baruah
- Department of Physiology, Assam Medical College, Dibrugarh, Assam, India
| | - Kanwar Narain
- Regional Medical Research Centre (ICMR) Dibrugarh, Assam, India
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Mohd-Zin SW, Marwan AI, Abou Chaar MK, Ahmad-Annuar A, Abdul-Aziz NM. Spina Bifida: Pathogenesis, Mechanisms, and Genes in Mice and Humans. Scientifica (Cairo) 2017; 2017:5364827. [PMID: 28286691 PMCID: PMC5327787 DOI: 10.1155/2017/5364827] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 11/14/2016] [Accepted: 12/01/2016] [Indexed: 05/26/2023]
Abstract
Spina bifida is among the phenotypes of the larger condition known as neural tube defects (NTDs). It is the most common central nervous system malformation compatible with life and the second leading cause of birth defects after congenital heart defects. In this review paper, we define spina bifida and discuss the phenotypes seen in humans as described by both surgeons and embryologists in order to compare and ultimately contrast it to the leading animal model, the mouse. Our understanding of spina bifida is currently limited to the observations we make in mouse models, which reflect complete or targeted knockouts of genes, which perturb the whole gene(s) without taking into account the issue of haploinsufficiency, which is most prominent in the human spina bifida condition. We thus conclude that the need to study spina bifida in all its forms, both aperta and occulta, is more indicative of the spina bifida in surviving humans and that the measure of deterioration arising from caudal neural tube defects, more commonly known as spina bifida, must be determined by the level of the lesion both in mouse and in man.
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Affiliation(s)
- Siti W. Mohd-Zin
- Department of Parasitology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Ahmed I. Marwan
- Laboratory for Fetal and Regenerative Biology, Colorado Fetal Care Center, Division of Pediatric Surgery, Children's Hospital Colorado, University of Colorado, Anschutz Medical Campus, 12700 E 17th Ave, Aurora, CO 80045, USA
| | | | - Azlina Ahmad-Annuar
- Department of Biomedical Science, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Noraishah M. Abdul-Aziz
- Department of Parasitology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Li K, Wahlqvist ML, Li D. Nutrition, One-Carbon Metabolism and Neural Tube Defects: A Review. Nutrients 2016; 8:nu8110741. [PMID: 27886045 PMCID: PMC5133124 DOI: 10.3390/nu8110741] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 11/06/2016] [Accepted: 11/16/2016] [Indexed: 12/26/2022] Open
Abstract
Neural tube defects (NTDs) are a group of severe congenital malformations, induced by the combined effects of genes and the environment. The most valuable finding so far has been the protective effect of folic acid supplementation against NTDs. However, many women do not take folic acid supplements until they are pregnant, which is too late to prevent NTDs effectively. Long-term intake of folic acid–fortified food is a good choice to solve this problem, and mandatory folic acid fortification should be further promoted, especially in Europe, Asia and Africa. Vitamin B2, vitamin B-6, vitamin B-12, choline, betaine and n-3 polyunsaturated fatty acids (PUFAs) can also reduce the NTD risk by interacting with the one-carbon metabolism pathway. This suggest that multivitamin B combined with choline, betaine and n-3 PUFAs supplementation may have a better protective effect against NTDs than folic acid alone. Genetic polymorphisms involved in one-carbon metabolism are associated with NTD risk, and gene screening for women of childbearing age prior to pregnancy may help prevent NTDs induced by the risk allele. In addition, the consumption of alcohol, tea and coffee, and low intakes of fruit and vegetable are also associated with the increased risk of NTDs, and should be avoided by women of childbearing age.
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Affiliation(s)
- Kelei Li
- Department of Food Science and Nutrition, Zhejiang University, Hangzhou 310058, China.
| | - Mark L Wahlqvist
- Fuli Institute, Zhejiang University, Hangzhou 310058, China.
- Monash Asia Institute and Departments of Medicine and of Nutrition and Dietetics, Monash University, Melbourne 3006, Australia.
| | - Duo Li
- Department of Food Science and Nutrition, Zhejiang University, Hangzhou 310058, China.
- Monash Asia Institute and Departments of Medicine and of Nutrition and Dietetics, Monash University, Melbourne 3006, Australia.
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Mahmuda NA, Yokoyama S, Huang JJ, Liu L, Munesue T, Nakatani H, Hayashi K, Yagi K, Yamagishi M, Higashida H. A Study of Single Nucleotide Polymorphisms of the SLC19A1/RFC1 Gene in Subjects with Autism Spectrum Disorder. Int J Mol Sci 2016; 17:E772. [PMID: 27213354 DOI: 10.3390/ijms17050772] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Revised: 04/24/2016] [Accepted: 05/02/2016] [Indexed: 01/05/2023] Open
Abstract
Autism Spectrum Disorder (ASD) is a group of neurodevelopmental disorders with complex genetic etiology. Recent studies have indicated that children with ASD may have altered folate or methionine metabolism, suggesting that the folate–methionine cycle may play a key role in the etiology of ASD. SLC19A1, also referred to as reduced folate carrier 1 (RFC1), is a member of the solute carrier group of transporters and is one of the key enzymes in the folate metabolism pathway. Findings from multiple genomic screens suggest the presence of an autism susceptibility locus on chromosome 21q22.3, which includes SLC19A1. Therefore, we performed a case-control study in a Japanese population. In this study, DNA samples obtained from 147 ASD patients at the Kanazawa University Hospital in Japan and 150 unrelated healthy Japanese volunteers were examined by the sequence-specific primer-polymerase chain reaction method pooled with fluorescence correlation spectroscopy. p < 0.05 was considered to represent a statistically significant outcome. Of 13 single nucleotide polymorphisms (SNPs) examined, a significant p-value was obtained for AA genotype of one SNP (rs1023159, OR = 0.39, 95% CI = 0.16–0.91, p = 0.0394; Fisher’s exact test). Despite some conflicting results, our findings supported a role for the polymorphism rs1023159 of the SLC19A1 gene, alone or in combination, as a risk factor for ASD. However, the findings were not consistent after multiple testing corrections. In conclusion, although our results supported a role of the SLC19A1 gene in the etiology of ASD, it was not a significant risk factor for the ASD samples analyzed in this study.
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Abstract
The 5, 10 methylenetetrahydrofolate reductase (MTHFR) enzyme is a catalyst in the folate metabolism pathway, the byproducts of which are involved in the remethylation of homocysteine to methionine. Methionine is a precursor for a major DNA methyl donor and is important for DNA methylation and gene regulation. Rare mutations in the MTHFR gene have been associated with autosomal recessive MTHFR deficiency leading to homocystinuria. In addition, two polymorphic variants in this gene (C677T and A1298C) have been implicated in a mild form of MTHFR deficiency associated with hyperhomocysteinemia. Mild to moderate hyperhomocysteinemia has been previously implicated as a risk factor for cardiovascular disease. Further, the presence of these variants, with and without mildly elevated levels of homocysteine, has been studied in relation to several multifactorial disorders including recurrent pregnancy loss, neural tube defects and congenital anomalies, cancer, and neurodevelopmental disorders. Given this wide spectrum of purported clinical implications and the prevalence of these polymorphisms, genetic counselors may encounter questions regarding the significance of MTHFR polymorphisms in a variety of settings. Here we present a brief background of the MTHFR polymorphisms, review of the literature regarding clinical considerations, and discussion of relevant genetic counseling aspects through case vignettes. Educational resources for patients and providers are also included.
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Affiliation(s)
- Brooke Levenseller Levin
- MD Anderson Cancer Center at Cooper, Cooper University Hospital, 900 Centennial Boulevard, Suite M, Voorhees, NJ, 08043, USA.
| | - Elizabeth Varga
- Division of Hematology/Oncology/BMT, Nationwide Children's Hospital, Columbus, OH, USA
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30
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Wang X, Fu J, Li Q, Zeng D. Geographical and Ethnic Distributions of the MTHFR C677T, A1298C and MTRR A66G Gene Polymorphisms in Chinese Populations: A Meta-Analysis. PLoS One 2016; 11:e0152414. [PMID: 27089387 PMCID: PMC4835080 DOI: 10.1371/journal.pone.0152414] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 03/14/2016] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND The geographical and ethnic distributions of the polymorphic methylenetetrahydrofolate reductase (MTHFR) mutations (C677T and A1298C) and methionine synthase reductase (MTRR) mutation (A66G) remain heterogeneous in China. The goal of this study was to estimate the pooled frequencies of the alleles and associated genotypes of these gene polymorphisms among healthy populations in Mainland China. OBJECTIVE AND METHODS We systematically reviewed published epidemiological studies on the distributions of 3 genetic variants in Chinese healthy populations living in Mainland China through a meta-analysis. The relevant electronic databases were searched. All of the raw data of the eligible citations were extracted. The frequency estimates were stratified by geography, ethnicity and sex. RESULTS Sixty-six studies were identified with a total of 92277 study participants. The meta-analysis revealed that the frequencies of the MTHFR C677T, A1298C, and MTRR A66G gene polymorphisms varied significantly between different ethnic groups and along geographical gradients. The frequencies of the 677T allele and 677TT genotype increased along the southern-central-northern direction across Mainland China (all Pvalues≤0.001). The frequencies of the 1298C, 1298CC, 66G and 66GG genotypes decreased along the south-central-north direction across the country (all Pvalues≤0.001). CONCLUSIONS Our meta-analysis strongly indicates significant geographical and ethnic variations in the frequencies of the C677T, A1298C, and A66G gene polymorphisms in the folate metabolism pathway among Chinese populations.
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Affiliation(s)
- Xingmin Wang
- Department of Gynecology, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, Guangxi, China
| | - Jinjian Fu
- Department of Gynecology, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, Guangxi, China
| | - Qianxi Li
- Department of Gynecology, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, Guangxi, China
| | - Dingyuan Zeng
- Department of Gynecology, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, Guangxi, China
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Obeid R, Oexle K, Rißmann A, Pietrzik K, Koletzko B. Folate status and health: challenges and opportunities. J Perinat Med 2016; 44:261-8. [PMID: 25825915 DOI: 10.1515/jpm-2014-0346] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 02/25/2015] [Indexed: 01/21/2023]
Abstract
Each year approximately 2400 pregnancies develop folic acid-preventable spina bifida and anencephaly in Europe. Currently, 70% of all affected pregnancies are terminated after prenatal diagnosis. The prevalence of neural tube defects (NTDs) has been significantly lowered in more than 70 countries worldwide by applying fortification with folic acid. Periconceptional supplementation of folic acid also reduces the risk of congenital heart diseases, preterm birth, low birth weight, and health problems associated with child mortality and morbidity. All European governments failed to issue folic acid fortification of centrally processed and widely eaten foods in order to prevent NTDs and other unwanted birth outcomes. The estimated average dietary intake of folate in Germany is 200 μg dietary folate equivalents (DFE)/day. More than half of German women of reproductive age do not consume sufficient dietary folate to achieve optimal serum or red blood cell folate concentrations (>18 or 1000 nmol/L, respectively) necessary to prevent spina bifida and anencephaly. To date, targeted supplementation is recommended in Europe, but this approach failed to reduce the rate of NTDs during the last 10 years. Public health centers for prenatal care and fortification with folic acid in Europe are urgently needed. Only such an action will sufficiently improve folate status, prevent at least 50% of the NTD cases, reduce child mortality and morbidity, and alleviate other health problems associated with low folate such as anemia.
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Mohtaram S, Sheikhha MH, Honarvar N, Sazegari A, Maraghechi N, Feizollahi Z, Ghasemi N. An Association Study of the SLC19A1 Gene Polymorphisms/Haplotypes with Idiopathic Recurrent Pregnancy Loss in an Iranian Population. Genet Test Mol Biomarkers 2016; 20:235-40. [PMID: 26959650 DOI: 10.1089/gtmb.2015.0230] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
AIMS The genetics of folate metabolism is one of the most significant mechanisms influencing fetal growth and may underlie some cases of unexplained recurrent miscarriage. Reduced folate carrier 1, encoded by the SLC19A1 gene, is a transporter of folate. Folate deficiency and elevated levels of homocysteine could be disadvantageous for the female reproductive system health. Thus, the balance between homocysteine and folate status can be used to measure the risk of recurrent pregnancy loss. METHODS The purpose of this study was to determine the association between -43T>C, 80G>A, and 696C>T polymorphisms of the SLC19A1 gene in 147 women who had unexplained recurrent miscarriage in comparison with 150 healthy women. Amplification refractory mutation system-polymerase chain reaction was used to genotype the molecular polymorphisms of this gene. RESULTS The results indicated that the -43T>C single nucleotide of the SLC19A1 gene was significantly associated with a risk of recurrent miscarriage in Iranian women (p < 0.05). No significant association was observed for the other two polymorphisms. The haplotype frequency distribution of -43C/80G/696C, -;43C/80G/696T, -43C/80G, and 80G/696T was significantly different in patients than controls, which may represent a novel risk factor for idiopathic recurrent pregnancy loss. CONCLUSIONS Polymorphisms and haplotypes of the SLC19A1 gene can be considered risk factors for idiopathic recurrent pregnancy loss.
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Affiliation(s)
- Shirin Mohtaram
- 1 International Campus of Yazd Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | | | - Negar Honarvar
- 1 International Campus of Yazd Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Ali Sazegari
- 1 International Campus of Yazd Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Neda Maraghechi
- 1 International Campus of Yazd Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Zahra Feizollahi
- 1 International Campus of Yazd Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Nasrin Ghasemi
- 2 Recurrent Abortion Research Centre, Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences , Yazd, Iran
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VanderMeer JE, Carter TC, Pangilinan F, Mitchell A, Kurnat-Thoma E, Kirke PN, Troendle JF, Molloy AM, Munger RG, Feldkamp ML, Mansilla MA, Mills JL, Murray JC, Brody LC. Evaluation of proton-coupled folate transporter (SLC46A1) polymorphisms as risk factors for neural tube defects and oral clefts. Am J Med Genet A 2016; 170A:1007-16. [PMID: 26789141 DOI: 10.1002/ajmg.a.37539] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 12/16/2015] [Indexed: 11/09/2022]
Abstract
Many folate-related genes have been investigated for possible causal roles in neural tube defects (NTDs) and oral clefts. However, no previous reports have examined the major gene responsible for folate uptake, the proton-coupled folate transporter (SLC46A1). We tested for association between these birth defects and single nucleotide polymorphisms in the SLC46A1 gene. The NTD study population included 549 complete and incomplete case-family triads, and 999 controls from Ireland. The oral clefts study population comprised a sample from Utah (495 complete and incomplete case-family triads and 551 controls) and 221 Filipino multiplex cleft families. There was suggestive evidence of increased NTD case risk with the rs17719944 minor allele (odds ratio (OR): 1.29; 95% confidence intervals (CI): [1.00-1.67]), and decreased maternal risk of an NTD pregnancy with the rs4795436 minor allele (OR: 0.62; [0.39-0.99]). In the Utah sample, the rs739439 minor allele was associated with decreased case risk for cleft lip with cleft palate (genotype relative risk (GRR): 0.56 [0.32-0.98]). Additionally, the rs2239907 minor allele was associated with decreased case risk for cleft lip with cleft palate in several models, and with cleft palate only in a recessive model (OR: 0.41; [0.20-0.85]). These associations did not remain statistically significant after correcting for multiple hypothesis testing. Nominal associations between SLC46A1 polymorphisms and both Irish NTDs and oral clefts in the Utah population suggest some role in the etiology of these birth defects, but further investigation in other populations is needed.
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Affiliation(s)
- Julia E VanderMeer
- Section of Molecular Pathogenesis, Medical Genomics Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, Maryland
| | - Tonia C Carter
- Division of Intramural Population Health Research, Department of Health and Human Services, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland
| | - Faith Pangilinan
- Section of Molecular Pathogenesis, Medical Genomics Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, Maryland
| | - Adam Mitchell
- Section of Molecular Pathogenesis, Medical Genomics Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, Maryland
| | - Emma Kurnat-Thoma
- Section of Molecular Pathogenesis, Medical Genomics Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, Maryland
| | - Peadar N Kirke
- Unit of Child Health Epidemiology, Health Research Board, Dublin, Ireland
| | - James F Troendle
- Office of Biostatistics Research, Department of Health and Human Services, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Anne M Molloy
- Department of Clinical Medicine, Trinity College Dublin, Dublin, Ireland
| | - Ronald G Munger
- Department of Nutrition, Dietetics and Food Sciences, Utah State University, Logan, Utah
| | - Marcia L Feldkamp
- Division of Medical Genetics, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, Utah
| | - Maria A Mansilla
- Division of Neonatology, Department of Pediatrics, University of Iowa, Iowa City, Iowa
| | - James L Mills
- Division of Intramural Population Health Research, Department of Health and Human Services, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland
| | - Jeff C Murray
- Division of Neonatology, Department of Pediatrics, University of Iowa, Iowa City, Iowa
| | - Lawrence C Brody
- Section of Molecular Pathogenesis, Medical Genomics Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, Maryland
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Chen J, Chen L, Zhu LH, Zhang ST, Wu YL. Association of methylenetetrahydrofolate reductase (MTHFR) C677T polymorphism with preterm delivery and placental abruption: a systematic review and meta-analysis. Acta Obstet Gynecol Scand 2015; 95:157-65. [PMID: 26439908 DOI: 10.1111/aogs.12789] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 09/20/2015] [Indexed: 01/07/2023]
Affiliation(s)
- Jian Chen
- Medical Department; Ningbo Women and Children's Hospital; Ningbo Zhejiang China
| | - Liang Chen
- Department of Obstetrics and Gynecology; Ningbo Women and Children's Hospital; Ningbo Zhejiang China
| | - Li-Hua Zhu
- Medical Department; Ningbo Women and Children's Hospital; Ningbo Zhejiang China
| | - Si-Tong Zhang
- Department of Obstetrics and Gynecology; Ningbo Women and Children's Hospital; Ningbo Zhejiang China
| | - Yi-Le Wu
- Department of Epidemiology and Statistics; School of Public Health; Anhui Medical University; Hefei Anhui China
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35
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Kumar P, Yadav U, Rai V. Methylenetetrahydrofolate reductase gene C677T polymorphism and breast cancer risk: Evidence for genetic susceptibility. Meta Gene 2015; 6:72-84. [PMID: 26629412 PMCID: PMC4634353 DOI: 10.1016/j.mgene.2015.08.008] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2015] [Revised: 08/21/2015] [Accepted: 08/31/2015] [Indexed: 12/11/2022] Open
Abstract
There are several evidences supporting the role of 5–10 methylenetetrahydrofolate reductase (MTHFR) gene polymorphisms in breast cancer (BC). Case control association studies on breast cancer have been repeatedly performed over the last two decades, but results are inconsistent. We performed a meta-analysis to confirm the association between MTHFR C677T polymorphism and BC risk. The articles were retrieved by searching the PubMed, Google Scholar, and Springer Link databases. Crude odds ratios (OR) with 95% confidence intervals (CIs) was used to assess the strength of association between C677T polymorphism and BC. Publication bias was assessed by Egger's and Begg-Mazumdar tests. Meta-analysis was performed with Open Meta Analyst. Total 75 studies with 31,315 cases and 35, 608 controls were found suitable for the inclusion in the present meta-analysis. The results of meta-analysis suggested that there were moderate significant association between C677T polymorphism and BC risk using overall comparisons in five genetic models (T vs. C: OR = 1.08, 95% CI = 1.03–1.13, p = < 0.001; TT + CT vs. CC: OR = 1.06, 95% CI = 1.02–1.09, p = < 0.001; TT vs. CC: OR = 1.17, 95% CI = 1.06–1.28, p = 0.001; CT vs. CC OR = 1.05, 95% CI = 1.01–1.08, p = 0.005; TT vs. CT + CC: OR = 1.12, 95% CI = 1.03–1.22, p = 0.005). In conclusion, results of present meta-analysis showed modest association between MTHFR C677T polymorphism with breast cancer in total studies. However, sub-group analysis results based on ethnicity showed strong significant association between TT genotype and breast cancer (TT vs. CC; OR°=°1.26; 95% CI: 1.06–1.51; p = 0.009) in Asian population but in Caucasian population such association was not observed (TT vs. CC; OR°=°1.08; 95% CI: 0.99–1.14; p = 0.05).
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Affiliation(s)
| | | | - Vandana Rai
- Corresponding author at: Human Molecular Genetics Laboratory, Department of Biotechnology, VBS Purvanchal University, Jaunpur 222 003, India.Human Molecular Genetics LaboratoryDepartment of BiotechnologyVBS Purvanchal UniversityJaunpur222 003India
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Abstract
Neural tube defects (NTDs) are the most common congenital defects of the central nervous system among neonates and the folate status during pregnancy was considered as the most important etiopathogenesis of NTDs. Besides, methionine synthase (MTR) gene and methionine synthase reductase (MTRR) gene were folate metabolism involved genes and had been investigated in several previous studies with inconsistent results. Hence, we aimed to explore the association of 4 selected single-nucleotide polymorphisms (SNPs) on MTRR/MTR gene and the susceptibility of NTDs in a Chinese population.Seven SNPs were selected from HapMap databases with Haploview 4.2 software. A polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) was performed to genotype the polymorphisms from blood samples of 165 NTDs patients and 280 healthy controls. The correlation between these SNPs and NTDs risk was tested by Student t test and Chi-square test by STATA 11.0 software. Furthermore, we performed a meta-analysis of relevant studies to investigate the association between the SNPs MTRR 66A>G and MTR 2756A>G and the susceptibility of NTDs.An increased risk of NTDs was verified to be significantly associated with MTRR 66A>G (G allele vs. A allele: OR = 1.36 (1.03-1.80), P = 0.028; GG + AG vs. AA: OR = 1.60 (1.05-2.43), P = 0.027) and MTR 2756A>G (G allele vs. A allele: OR = 1.45 (1.06-1.98), P = 0.021; GG + AG vs. AA: OR = 1.51 (1.02-2.23), P = 0.038) in our study. However, the other SNPs in our analysis showed no significant association with NTDs risk (all P > 0.05). Furthermore, the result of the meta-analysis supported the association between MTRR 66A>G and NTDs risk (G allele vs. A allele: OR = 1.32, 95% CI = 1.09-1.61, GG + GA vs. AA: OR = 1.49, 95% CI = 1.06-2.09, GG vs. AA: OR = 1.61, 95% CI = 1.04-2.49).Our study confirmed that the MTRR 66A>G and MTR 2756A>G were significantly associated with the increased NTDs risk in a Chinese population. The further meta-analysis enhance that MTRR 66A>G was connected with the susceptibility of NTDs widely. Further investigations based on more detailed stratification were recommended.
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Affiliation(s)
- Yongxin Wang
- From the Neurosurgical Department, the 1st Affiliated Hospital of Xinjiang Medical University, Urumqi, China
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Wang Y, Liu Y, Ji W, Qin H, Wu H, Xu D, Turtuohut T, Wang Z. Variants in MTHFR gene and neural tube defects susceptibility in China. Metab Brain Dis 2015; 30:1017-26. [PMID: 25855017 DOI: 10.1007/s11011-015-9662-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 02/23/2015] [Indexed: 12/31/2022]
Abstract
Neural tube defect (NTD) is a severe congenital birth abnormalities involving incomplete neural tube closure. 5, 10-methylenetetrahydrofolate reductase (MTHFR) gene plays key role in folate cycle and methylation cycle, which could affect the DNA synthesis, repair and methylation. In this study, we aim to investigate the correlation between MTHFR polymorphisms and NTD-affected pregnancy. There were 444 participants involved in our study. Tag-SNPs were identified in HapMap Databases. Blood samples were collected from all subjects to further extract the genomic DNAs by TaqMan Blood DNA kits. We also carried out a meta-analysis based on previous published studies to further examine the association between MTHFR polymorphisms and NTD. In case-control study analysis, two SNPs were identified to be associated with NTD risk. The 677 C > T genetic variant was correlated with increased risk of NTD-affected pregnancy. However, the 1298 A > C polymorphism was shown to lower the risk of NTD-affected pregnancy. The protective role of 1298 A > C polymorphisms was further supported by the result of meta-analysis. Our study revealed that the SNPs of 677C > T and 1298A > C in MTHFR were associated with NTD-affected pregnancy, in which 677C > T was a risk factor and in contrast 1298A > C was protective factor against NTD. Our results of meta-analysis also revealed the 1298A > C MTHFR polymorphism play protective role in NTD.
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Affiliation(s)
- Yongxin Wang
- Department of Neurosurgery, First Affiliated Hospital of Xinjiang Medical University, No. 137 South Liyushan Road, Urumqi, 830054, China
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Tsang BL, Devine OJ, Cordero AM, Marchetta CM, Mulinare J, Mersereau P, Guo J, Qi YP, Berry RJ, Rosenthal J, Crider KS, Hamner HC. Assessing the association between the methylenetetrahydrofolate reductase (MTHFR) 677C>T polymorphism and blood folate concentrations: a systematic review and meta-analysis of trials and observational studies. Am J Clin Nutr 2015; 101:1286-94. [PMID: 25788000 DOI: 10.3945/ajcn.114.099994] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 02/09/2015] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND The methylenetetrahydrofolate reductase (MTHFR) 677C>T polymorphism is a risk factor for neural tube defects. The T allele produces an enzyme with reduced folate-processing capacity, which has been associated with lower blood folate concentrations. OBJECTIVE We assessed the association between MTHFR C677T genotypes and blood folate concentrations among healthy women aged 12-49 y. DESIGN We conducted a systematic review of the literature published from January 1992 to March 2014 to identify trials and observational studies that reported serum, plasma, or red blood cell (RBC) folate concentrations and MTHFR C677T genotype. We conducted a meta-analysis for estimates of percentage differences in blood folate concentrations between genotypes. RESULTS Forty studies met the inclusion criteria. Of the 6 studies that used the microbiologic assay (MA) to measure serum or plasma (S/P) and RBC folate concentrations, the percentage difference between genotypes showed a clear pattern of CC > CT > TT. The percentage difference was greatest for CC > TT [S/P: 13%; 95% credible interval (CrI): 7%, 18%; RBC: 16%; 95% CrI: 12%, 20%] followed by CC > CT (S/P: 7%; 95% CrI: 1%, 12%; RBC: 8%; 95% CrI: 4%, 12%) and CT > TT (S/P: 6%; 95% CrI: 1%, 11%; RBC: 9%; 95% CrI: 5%, 13%). S/P folate concentrations measured by using protein-binding assays (PBAs) also showed this pattern but to a greater extent (e.g., CC > TT: 20%; 95% CrI: 17%, 22%). In contrast, RBC folate concentrations measured by using PBAs did not show the same pattern and are presented in the Supplemental Material only. CONCLUSIONS Meta-analysis results (limited to the MA, the recommended population assessment method) indicated a consistent percentage difference in S/P and RBC folate concentrations across MTHFR C677T genotypes. Lower blood folate concentrations associated with this polymorphism could have implications for a population-level risk of neural tube defects.
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Affiliation(s)
- Becky L Tsang
- From the Division of Birth Defects and Developmental Disabilities, National Center for Birth Defects and Developmental Disabilities (NCBDDD), CDC, Atlanta, GA (AMC, RJB, JR, and KSC); the Division of Nutrition, Physical Activity, and Obesity, National Center on Chronic Disease Prevention and Health Promotion, CDC, Atlanta, GA (HCH); Acentia (contractor for CDC, NCBDDD), Falls Church, VA (JG); Carter Consulting Inc. (contractor for CDC, NCBDDD), Atlanta, GA (OJD, JM, and YPQ); the Oak Ridge Institute for Science and Education, Oak Ridge, TN (BLT, CMM, and YPQ); SciMetrika LLC (contractor for CDC, NCBDDD), Atlanta, GA (PM)
| | - Owen J Devine
- From the Division of Birth Defects and Developmental Disabilities, National Center for Birth Defects and Developmental Disabilities (NCBDDD), CDC, Atlanta, GA (AMC, RJB, JR, and KSC); the Division of Nutrition, Physical Activity, and Obesity, National Center on Chronic Disease Prevention and Health Promotion, CDC, Atlanta, GA (HCH); Acentia (contractor for CDC, NCBDDD), Falls Church, VA (JG); Carter Consulting Inc. (contractor for CDC, NCBDDD), Atlanta, GA (OJD, JM, and YPQ); the Oak Ridge Institute for Science and Education, Oak Ridge, TN (BLT, CMM, and YPQ); SciMetrika LLC (contractor for CDC, NCBDDD), Atlanta, GA (PM)
| | - Amy M Cordero
- From the Division of Birth Defects and Developmental Disabilities, National Center for Birth Defects and Developmental Disabilities (NCBDDD), CDC, Atlanta, GA (AMC, RJB, JR, and KSC); the Division of Nutrition, Physical Activity, and Obesity, National Center on Chronic Disease Prevention and Health Promotion, CDC, Atlanta, GA (HCH); Acentia (contractor for CDC, NCBDDD), Falls Church, VA (JG); Carter Consulting Inc. (contractor for CDC, NCBDDD), Atlanta, GA (OJD, JM, and YPQ); the Oak Ridge Institute for Science and Education, Oak Ridge, TN (BLT, CMM, and YPQ); SciMetrika LLC (contractor for CDC, NCBDDD), Atlanta, GA (PM)
| | - Claire M Marchetta
- From the Division of Birth Defects and Developmental Disabilities, National Center for Birth Defects and Developmental Disabilities (NCBDDD), CDC, Atlanta, GA (AMC, RJB, JR, and KSC); the Division of Nutrition, Physical Activity, and Obesity, National Center on Chronic Disease Prevention and Health Promotion, CDC, Atlanta, GA (HCH); Acentia (contractor for CDC, NCBDDD), Falls Church, VA (JG); Carter Consulting Inc. (contractor for CDC, NCBDDD), Atlanta, GA (OJD, JM, and YPQ); the Oak Ridge Institute for Science and Education, Oak Ridge, TN (BLT, CMM, and YPQ); SciMetrika LLC (contractor for CDC, NCBDDD), Atlanta, GA (PM)
| | - Joseph Mulinare
- From the Division of Birth Defects and Developmental Disabilities, National Center for Birth Defects and Developmental Disabilities (NCBDDD), CDC, Atlanta, GA (AMC, RJB, JR, and KSC); the Division of Nutrition, Physical Activity, and Obesity, National Center on Chronic Disease Prevention and Health Promotion, CDC, Atlanta, GA (HCH); Acentia (contractor for CDC, NCBDDD), Falls Church, VA (JG); Carter Consulting Inc. (contractor for CDC, NCBDDD), Atlanta, GA (OJD, JM, and YPQ); the Oak Ridge Institute for Science and Education, Oak Ridge, TN (BLT, CMM, and YPQ); SciMetrika LLC (contractor for CDC, NCBDDD), Atlanta, GA (PM)
| | - Patricia Mersereau
- From the Division of Birth Defects and Developmental Disabilities, National Center for Birth Defects and Developmental Disabilities (NCBDDD), CDC, Atlanta, GA (AMC, RJB, JR, and KSC); the Division of Nutrition, Physical Activity, and Obesity, National Center on Chronic Disease Prevention and Health Promotion, CDC, Atlanta, GA (HCH); Acentia (contractor for CDC, NCBDDD), Falls Church, VA (JG); Carter Consulting Inc. (contractor for CDC, NCBDDD), Atlanta, GA (OJD, JM, and YPQ); the Oak Ridge Institute for Science and Education, Oak Ridge, TN (BLT, CMM, and YPQ); SciMetrika LLC (contractor for CDC, NCBDDD), Atlanta, GA (PM)
| | - Jing Guo
- From the Division of Birth Defects and Developmental Disabilities, National Center for Birth Defects and Developmental Disabilities (NCBDDD), CDC, Atlanta, GA (AMC, RJB, JR, and KSC); the Division of Nutrition, Physical Activity, and Obesity, National Center on Chronic Disease Prevention and Health Promotion, CDC, Atlanta, GA (HCH); Acentia (contractor for CDC, NCBDDD), Falls Church, VA (JG); Carter Consulting Inc. (contractor for CDC, NCBDDD), Atlanta, GA (OJD, JM, and YPQ); the Oak Ridge Institute for Science and Education, Oak Ridge, TN (BLT, CMM, and YPQ); SciMetrika LLC (contractor for CDC, NCBDDD), Atlanta, GA (PM)
| | - Yan Ping Qi
- From the Division of Birth Defects and Developmental Disabilities, National Center for Birth Defects and Developmental Disabilities (NCBDDD), CDC, Atlanta, GA (AMC, RJB, JR, and KSC); the Division of Nutrition, Physical Activity, and Obesity, National Center on Chronic Disease Prevention and Health Promotion, CDC, Atlanta, GA (HCH); Acentia (contractor for CDC, NCBDDD), Falls Church, VA (JG); Carter Consulting Inc. (contractor for CDC, NCBDDD), Atlanta, GA (OJD, JM, and YPQ); the Oak Ridge Institute for Science and Education, Oak Ridge, TN (BLT, CMM, and YPQ); SciMetrika LLC (contractor for CDC, NCBDDD), Atlanta, GA (PM)
| | - Robert J Berry
- From the Division of Birth Defects and Developmental Disabilities, National Center for Birth Defects and Developmental Disabilities (NCBDDD), CDC, Atlanta, GA (AMC, RJB, JR, and KSC); the Division of Nutrition, Physical Activity, and Obesity, National Center on Chronic Disease Prevention and Health Promotion, CDC, Atlanta, GA (HCH); Acentia (contractor for CDC, NCBDDD), Falls Church, VA (JG); Carter Consulting Inc. (contractor for CDC, NCBDDD), Atlanta, GA (OJD, JM, and YPQ); the Oak Ridge Institute for Science and Education, Oak Ridge, TN (BLT, CMM, and YPQ); SciMetrika LLC (contractor for CDC, NCBDDD), Atlanta, GA (PM)
| | - Jorge Rosenthal
- From the Division of Birth Defects and Developmental Disabilities, National Center for Birth Defects and Developmental Disabilities (NCBDDD), CDC, Atlanta, GA (AMC, RJB, JR, and KSC); the Division of Nutrition, Physical Activity, and Obesity, National Center on Chronic Disease Prevention and Health Promotion, CDC, Atlanta, GA (HCH); Acentia (contractor for CDC, NCBDDD), Falls Church, VA (JG); Carter Consulting Inc. (contractor for CDC, NCBDDD), Atlanta, GA (OJD, JM, and YPQ); the Oak Ridge Institute for Science and Education, Oak Ridge, TN (BLT, CMM, and YPQ); SciMetrika LLC (contractor for CDC, NCBDDD), Atlanta, GA (PM)
| | - Krista S Crider
- From the Division of Birth Defects and Developmental Disabilities, National Center for Birth Defects and Developmental Disabilities (NCBDDD), CDC, Atlanta, GA (AMC, RJB, JR, and KSC); the Division of Nutrition, Physical Activity, and Obesity, National Center on Chronic Disease Prevention and Health Promotion, CDC, Atlanta, GA (HCH); Acentia (contractor for CDC, NCBDDD), Falls Church, VA (JG); Carter Consulting Inc. (contractor for CDC, NCBDDD), Atlanta, GA (OJD, JM, and YPQ); the Oak Ridge Institute for Science and Education, Oak Ridge, TN (BLT, CMM, and YPQ); SciMetrika LLC (contractor for CDC, NCBDDD), Atlanta, GA (PM)
| | - Heather C Hamner
- From the Division of Birth Defects and Developmental Disabilities, National Center for Birth Defects and Developmental Disabilities (NCBDDD), CDC, Atlanta, GA (AMC, RJB, JR, and KSC); the Division of Nutrition, Physical Activity, and Obesity, National Center on Chronic Disease Prevention and Health Promotion, CDC, Atlanta, GA (HCH); Acentia (contractor for CDC, NCBDDD), Falls Church, VA (JG); Carter Consulting Inc. (contractor for CDC, NCBDDD), Atlanta, GA (OJD, JM, and YPQ); the Oak Ridge Institute for Science and Education, Oak Ridge, TN (BLT, CMM, and YPQ); SciMetrika LLC (contractor for CDC, NCBDDD), Atlanta, GA (PM).
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Lemay P, Guyot MC, Tremblay É, Dionne-Laporte A, Spiegelman D, Henrion É, Diallo O, De Marco P, Merello E, Massicotte C, Désilets V, Michaud JL, Rouleau GA, Capra V, Kibar Z. Loss-of-function de novo mutations play an important role in severe human neural tube defects. J Med Genet 2015; 52:493-7. [PMID: 25805808 DOI: 10.1136/jmedgenet-2015-103027] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 03/04/2015] [Indexed: 01/15/2023]
Abstract
BACKGROUND Neural tube defects (NTDs) are very common and severe birth defects that are caused by failure of neural tube closure and that have a complex aetiology. Anencephaly and spina bifida are severe NTDs that affect reproductive fitness and suggest a role for de novo mutations (DNMs) in their aetiology. METHODS We used whole-exome sequencing in 43 sporadic cases affected with myelomeningocele or anencephaly and their unaffected parents to identify DNMs in their exomes. RESULTS We identified 42 coding DNMs in 25 cases, of which 6 were loss of function (LoF) showing a higher rate of LoF DNM in our cohort compared with control cohorts. Notably, we identified two protein-truncating DNMs in two independent cases in SHROOM3, previously associated with NTDs only in animal models. We have demonstrated a significant enrichment of LoF DNMs in this gene in NTDs compared with the gene specific DNM rate and to the DNM rate estimated from control cohorts. We also identified one nonsense DNM in PAX3 and two potentially causative missense DNMs in GRHL3 and PTPRS. CONCLUSIONS Our study demonstrates an important role of LoF DNMs in the development of NTDs and strongly implicates SHROOM3 in its aetiology.
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Affiliation(s)
- Philippe Lemay
- CHU Ste-Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Marie-Claude Guyot
- CHU Ste-Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Élizabeth Tremblay
- CHU Ste-Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | | | - Dan Spiegelman
- Montreal Neurological Institute, McGill University, Montréal, Québec, Canada
| | - Édouard Henrion
- Montreal Neurological Institute, McGill University, Montréal, Québec, Canada
| | - Ousmane Diallo
- Montreal Neurological Institute, McGill University, Montréal, Québec, Canada
| | | | | | - Christine Massicotte
- CHU Ste-Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Valérie Désilets
- CHU Ste-Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Jacques L Michaud
- CHU Ste-Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Guy A Rouleau
- Montreal Neurological Institute, McGill University, Montréal, Québec, Canada
| | | | - Zoha Kibar
- CHU Ste-Justine Research Center, Université de Montréal, Montréal, Québec, Canada
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40
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Yadav U, Kumar P, Yadav SK, Mishra OP, Rai V. "Polymorphisms in folate metabolism genes as maternal risk factor for neural tube defects: an updated meta-analysis". Metab Brain Dis 2015; 30:7-24. [PMID: 25005003 DOI: 10.1007/s11011-014-9575-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Accepted: 06/05/2014] [Indexed: 02/02/2023]
Abstract
Epidemiological studies have evaluated the association between maternal methylenetetrahydrofolate reductase (MTHFR) C677T, A1298C and methionine synthase reductase (MTRR) A66G polymorphisms and risk of neural tube defects (NTDs) in offspring. However, the results from the published studies on the association between these three polymorphisms and NTD risk are conflicting. To derive a clearer picture of association between these three maternal polymorphisms and risk of NTD, we performed meta-analysis. A comprehensive search was conducted to identify all case-control studies of maternal MTHFR and MTRR polymorphisms and NTD risk. We used odds ratios (ORs) with 95% confidence intervals (CIs) to assess the strength of the association. Overall, we found that maternal MTHFR C677T polymorphism (OR(TvsC) =1.20; 95% CI = 1.13-1.28) and MTRR A66G polymorphism (OR(GvsA) = 1.21; 95% CI = 0.98-1.49) were risk factors for producing offspring with NTD but maternal MTHFR A1298C polymorphism (OR(CvsA) = 0.91; 95% CI = 0.78-1.07) was not associated with NTD risk. However, in stratified analysis by geographical regions, we found that the maternal C677T polymorphism was significantly associated with the risk of NTD in Asian (OR(TvsC) = 1.43; 95% CI: 1.05-1.94), European (OR(TvsC) = 1.13; 95% CI: 1.04-1.24) and American (OR(TvsC) = 1.26; 95% CI: 1.13-1.41) populations. In conclusion, present meta-analysis supports that the maternal MTHFR C677T and MTRR A66G are polymorphisms contributory to risk for NTD.
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Affiliation(s)
- Upendra Yadav
- Human Molecular Genetics Laboratory, Department of Biotechnology, VBS Purvanchal University, Jaunpur, 222 003, UP, India
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41
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Pangilinan F, Molloy AM, Mills JL, Troendle JF, Parle-McDermott A, Kay DM, Browne ML, McGrath EC, Abaan HO, Sutton M, Kirke PN, Caggana M, Shane B, Scott JM, Brody LC. Replication and exploratory analysis of 24 candidate risk polymorphisms for neural tube defects. BMC Med Genet 2014; 15:102. [PMID: 25293959 PMCID: PMC4411759 DOI: 10.1186/s12881-014-0102-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Accepted: 08/19/2014] [Indexed: 12/14/2022]
Abstract
Background Neural tube defects (NTDs), which are among the most common congenital malformations, are influenced by environmental and genetic factors. Low maternal folate is the strongest known contributing factor, making variants in genes in the folate metabolic pathway attractive candidates for NTD risk. Multiple studies have identified nominally significant allelic associations with NTDs. We tested whether associations detected in a large Irish cohort could be replicated in an independent population. Methods Replication tests of 24 nominally significant NTD associations were performed in racially/ethnically matched populations. Family-based tests of fifteen nominally significant single nucleotide polymorphisms (SNPs) were repeated in a cohort of NTD trios (530 cases and their parents) from the United Kingdom, and case–control tests of nine nominally significant SNPs were repeated in a cohort (190 cases, 941 controls) from New York State (NYS). Secondary hypotheses involved evaluating the latter set of nine SNPs for NTD association using alternate case–control models and NTD groupings in white, African American and Hispanic cohorts from NYS. Results Of the 24 SNPs tested for replication, ADA rs452159 and MTR rs10925260 were significantly associated with isolated NTDs. Of the secondary tests performed, ARID1A rs11247593 was associated with NTDs in whites, and ALDH1A2 rs7169289 was associated with isolated NTDs in African Americans. Conclusions We report a number of associations between SNP genotypes and neural tube defects. These associations were nominally significant before correction for multiple hypothesis testing. These corrections are highly conservative for association studies of untested hypotheses, and may be too conservative for replication studies. We therefore believe the true effect of these four nominally significant SNPs on NTD risk will be more definitively determined by further study in other populations, and eventual meta-analysis. Electronic supplementary material The online version of this article (doi:10.1186/s12881-014-0102-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Faith Pangilinan
- Molecular Pathogenesis Section, Genome Technology Branch, National Human Genome Research Institute, National Institutes of Health, Room 5306, 50 South Drive, Bethesda, MD, 20892-8004, USA.
| | - Anne M Molloy
- Department of Clinical Medicine, Trinity College Dublin, Dublin, Ireland.
| | - James L Mills
- Division of Epidemiology, Statistics and Prevention Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA.
| | - James F Troendle
- Office of Biostatistics Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, USA.
| | | | - Denise M Kay
- New York State Department of Health, Division of Genetics, Wadsworth Center, Albany, NY, 12201, USA.
| | - Marilyn L Browne
- New York State Department of Health, Congenital Malformations Registry, Troy, NY, 12180, USA. .,Department of Epidemiology and Biostatistics, School of Public Health, University at Albany, Rensselaer, NY, 12144, USA.
| | - Emily C McGrath
- New York State Department of Health, Division of Genetics, Wadsworth Center, Albany, NY, 12201, USA.
| | - Hatice Ozel Abaan
- Molecular Pathogenesis Section, Genome Technology Branch, National Human Genome Research Institute, National Institutes of Health, Room 5306, 50 South Drive, Bethesda, MD, 20892-8004, USA.
| | - Marie Sutton
- Evidence Centre, Health Research Board, Dublin, Ireland.
| | - Peadar N Kirke
- Child Health Epidemiology Unit, Health Research Board, Dublin, Ireland.
| | - Michele Caggana
- New York State Department of Health, Division of Genetics, Wadsworth Center, Albany, NY, 12201, USA.
| | - Barry Shane
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, CA, 94720-3104, USA.
| | - John M Scott
- School of Biochemistry and Immunology, Trinity College Dublin, Dublin, Ireland.
| | - Lawrence C Brody
- Molecular Pathogenesis Section, Genome Technology Branch, National Human Genome Research Institute, National Institutes of Health, Room 5306, 50 South Drive, Bethesda, MD, 20892-8004, USA.
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Abstract
The formation of the embryonic brain and spinal cord begins as the neural plate bends to form the neural folds, which meet and adhere to close the neural tube. The neural ectoderm and surrounding tissues also coordinate proliferation, differentiation, and patterning. This highly orchestrated process is susceptible to disruption, leading to neural tube defects (NTDs), a common birth defect. Here, we highlight genetic and epigenetic contributions to neural tube closure. We describe an online database we created as a resource for researchers, geneticists, and clinicians. Neural tube closure is sensitive to environmental influences, and we discuss disruptive causes, preventative measures, and possible mechanisms. New technologies will move beyond candidate genes in small cohort studies toward unbiased discoveries in sporadic NTD cases. This will uncover the genetic complexity of NTDs and critical gene-gene interactions. Animal models can reveal the causative nature of genetic variants, the genetic interrelationships, and the mechanisms underlying environmental influences.
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Affiliation(s)
- Jonathan J Wilde
- Department of Pediatrics, University of Colorado Anschutz Medical Campus, Children's Hospital Colorado, Aurora, Colorado 80045;
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43
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Braun JM, Froehlich T, Kalkbrenner A, Pfeiffer CM, Fazili Z, Yolton K, Lanphear BP. Brief report: are autistic-behaviors in children related to prenatal vitamin use and maternal whole blood folate concentrations? J Autism Dev Disord 2014; 44:2602-7. [PMID: 24710813 PMCID: PMC4167931 DOI: 10.1007/s10803-014-2114-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Prenatal multivitamin/folic acid supplement use may reduce the risk of autism spectrum disorders. We investigated whether 2nd trimester prenatal vitamin use and maternal whole blood folate (WBF) concentrations were associated with Social Responsiveness Scale (SRS) scores at 4-5 years of age in a prospective cohort of 209 mother-child pairs. After confounder adjustment, children born to women taking prenatal vitamins weekly/daily (n = 179) had lower odds of clinically elevated SRS scores (odds ratio 0.26; 95 % confidence interval 0.08, 0.89) than those who rarely/never took them (n = 30). WBF concentrations were not associated with SRS scores. The lack of association between WBF and autistic-behaviors may be due to the timing of biomarker measures relative to critical periods of brain development, confounding, or other modifying factors.
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Affiliation(s)
- Joseph M Braun
- Department of Epidemiology, Brown University School of Public Health, Brown University, Providence, RI, 02912, USA,
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44
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Rai V, Yadav U, Kumar P, Yadav SK, Mishra OP. Maternal methylenetetrahydrofolate reductase C677T polymorphism and down syndrome risk: a meta-analysis from 34 studies. PLoS One 2014; 9:e108552. [PMID: 25265565 DOI: 10.1371/journal.pone.0108552] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2014] [Accepted: 08/28/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Methylenetetrahydrofolate reductase (MTHFR) is a key enzyme of folate metabolic pathway which catalyzes the irreversible conversion of 5, 10-methylenetetrahydrofolate to 5-methyltetrahydrofolate. 5-methyltetrahydrofolate donates methyl group for the methylation of homocysteine to methionine. Several studies have investigated maternal MTHFR C677T polymorphism as a risk factor for DS, but the results were controversial and inconclusive. To come into a conclusive estimate, authors performed a meta-analysis. AIM A meta-analysis of published case control studies was performed to investigate the association between maternal MTHFR C677T polymorphism and Down syndrome. METHODS PubMed, Google Scholar, Elsevier, Springer Link databases were searched to select the eligible case control studies using appropriate keywords. The pooled odds ratio (OR) with 95%confidence interval were calculated for risk assessment. RESULTS Thirty four studies with 3,098 DS case mothers and 4,852 control mothers were included in the present meta-analysis. The pooled OR was estimated under five genetic models and significant association was found between maternal MTHFR 677C>T polymorphism and Down syndrome under four genetic models except recessive model (for T vs. C, OR = 1.26, 95% CI = 1.09-1.46, p = 0.001; for TT vs. CC, OR = 1.49, 95% CI = 1.13-1.97, p = 0.008; for CT vs. CC, OR = 1.29, 95% CI = 1.10-1.51, p = 0.001; for TT+CT vs. CC, OR = 1.35, 95% CI = 1.13-1.60, p = 0.0008; for TT vs. CT+CC, OR = 0.76, 95% CI = 0.60-0.94, p = 0.01). CONCLUSION The results of the present meta-analysis support that maternal MTHFR C677T polymorphism is a risk factor for DS- affected pregnancy.
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Abstract
Maternal exposure to dietary factors during pregnancy can influence embryonic development and may modulate the phenotype of offspring through epigenetic programming. Folate is critical for nucleotide synthesis, and preconceptional intake of dietary folic acid (FA) is credited with reduced incidences of neural tube defects in infants. While fortification of grains with FA resulted in a positive public-health outcome, concern has been raised for the need for further investigation of unintended consequences and potential health hazards arising from excessive FA intakes, especially following reports that FA may exert epigenetic effects. The objective of this article is to discuss the role of FA in human health and to review the benefits, concerns and epigenetic effects of maternal FA on the basis of recent findings that are important to design future studies.
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Affiliation(s)
- Subit Barua
- Department of Developmental Biochemistry, New York State Institute for Basic Research in Developmental Disabilities, 1050 Forest Hill Road, Staten Island 10314, NY, USA
| | - Salomon Kuizon
- Department of Developmental Biochemistry, New York State Institute for Basic Research in Developmental Disabilities, 1050 Forest Hill Road, Staten Island 10314, NY, USA
| | - Mohammed A Junaid
- Department of Developmental Biochemistry, New York State Institute for Basic Research in Developmental Disabilities, 1050 Forest Hill Road, Staten Island 10314, NY, USA
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Apkon SD, Grady R, Hart S, Lee A, McNalley T, Niswander L, Petersen J, Remley S, Rotenstein D, Shurtleff H, Warner M, Walker WO. Advances in the care of children with spina bifida. Adv Pediatr 2014; 61:33-74. [PMID: 25037124 DOI: 10.1016/j.yapd.2014.03.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Susan D Apkon
- Rehabilitation Medicine, University of Washington, Seattle, WA, USA; Rehabilitation Medicine, Seattle Children's Hospital, 4800 Sand Point Way Northeast, M/S OB-8414, Seattle, WA 98105, USA.
| | - Richard Grady
- Section of Pediatric Urology, Seattle Children's Hospital, University of Washington School of Medicine, 4800 Sand Point Way Northeast, Seattle, WA 98105, USA
| | - Solveig Hart
- Rehabilitation Services, Seattle Children's Hospital, 4800 Sand Point Way Northeast, Seattle, WA 98105, USA
| | - Amy Lee
- Pediatric Neurosurgery, Seattle Children's Hospital, University of Washington, 4800 Sand Point Way Northeast, M/S W7729, PO Box 5371, Seattle, WA 98105, USA
| | - Thomas McNalley
- Rehabilitation Medicine, Seattle Children's Hospital, University of Washington, 4800 Sand Point Way Northeast, M/S OB-8404, Seattle, WA 98105, USA
| | - Lee Niswander
- Department of Pediatrics, Children's Hospital Colorado, Howard Hughes Medical Institute, University of Colorado School of Medicine, Mail Stop 8133, Building RC1 South, Room L18-12106, 12801 East 17th Avenue, Aurora, CO 80045, USA
| | - Juliette Petersen
- Molecular Biology Program, University of Colorado Denver Anschutz Medical Campus, Mail Stop 8133, Building RC1 South, L18-12400D, 12801 East 17th Avenue, Aurora, CO 80045, USA
| | - Sheridan Remley
- Rehabilitation Services, Seattle Children's Hospital, 4800 Sand Point Way Northeast, Seattle, WA 98105, USA
| | - Deborah Rotenstein
- Pediatric Endocrinology, Endocrine Division, Pediatric Alliance, 1789 South Braddock Avenue, Suite 294, Pittsburgh, PA 15218, USA
| | - Hillary Shurtleff
- Department of Neurology, University of Washington School of Medicine, Seattle, WA, USA; Department of Child Psychiatry, Seattle Children's Hospital, 4800 Sand Point Way Northeast, Seattle, WA 98105, USA
| | - Molly Warner
- Department of Neurology, University of Washington School of Medicine, Seattle, WA, USA; Neuropsychology Consult Service, Department of Psychiatry, Seattle Children's Hospital, 4800 Sand Point Way Northeast, Seattle, WA 98105, USA
| | - William O Walker
- Division of Developmental Medicine, Seattle Children's Hospital, University of Washington School of Medicine, 4800 Sand Point Way Northeast, M/S OC.9.940, Seattle, WA 98105, USA
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Crider KS, Devine O, Hao L, Dowling NF, Li S, Molloy AM, Li Z, Zhu J, Berry RJ. Population red blood cell folate concentrations for prevention of neural tube defects: Bayesian model. BMJ 2014; 349:g4554. [PMID: 25073783 PMCID: PMC4115151 DOI: 10.1136/bmj.g4554] [Citation(s) in RCA: 127] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/23/2014] [Indexed: 02/06/2023]
Abstract
OBJECTIVE To determine an optimal population red blood cell (RBC) folate concentration for the prevention of neural tube birth defects. DESIGN Bayesian model. SETTING Data from two population based studies in China. PARTICIPANTS 247,831 participants in a prospective community intervention project in China (1993-95) to prevent neural tube defects with 400 μg/day folic acid supplementation and 1194 participants in a population based randomized trial (2003-05) to evaluate the effect of folic acid supplementation on blood folate concentration among Chinese women of reproductive age. INTERVENTION Folic acid supplementation (400 μg/day). MAIN OUTCOME MEASURES Estimated RBC folate concentration at time of neural tube closure (day 28 of gestation) and risk of neural tube defects. RESULTS Risk of neural tube defects was high at the lowest estimated RBC folate concentrations (for example, 25.4 (95% uncertainty interval 20.8 to 31.2) neural tube defects per 10,000 births at 500 nmol/L) and decreased as estimated RBC folate concentration increased. Risk of neural tube defects was substantially attenuated at estimated RBC folate concentrations above about 1000 nmol/L (for example, 6 neural tube defects per 10,000 births at 1180 (1050 to 1340) nmol/L). The modeled dose-response relation was consistent with the existing literature. In addition, neural tube defect risk estimates developed using the proposed model and population level RBC information were consistent with the prevalence of neural tube defects in the US population before and after food fortification with folic acid. CONCLUSIONS A threshold for "optimal" population RBC folate concentration for the prevention of neural tube defects could be defined (for example, approximately 1000 nmol/L). Population based RBC folate concentrations, as a biomarker for risk of neural tube defects, can be used to facilitate evaluation of prevention programs as well as to identify subpopulations at elevated risk for a neural tube defect affected pregnancy due to folate insufficiency.
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Affiliation(s)
- Krista S Crider
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA
| | - Owen Devine
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA
| | - Ling Hao
- Peking University Health Science Center, Peking University, Beijing, China US Centers for Disease Control and Prevention, US Embassy, Beijing, China
| | - Nicole F Dowling
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA
| | - Song Li
- Peking University Third Hospital, Beijing, China
| | - Anne M Molloy
- School of Medicine, Trinity College, Dublin, Ireland
| | - Zhu Li
- Peking University Health Science Center, Peking University, Beijing, China
| | - Jianghui Zhu
- Peking University Health Science Center, Peking University, Beijing, China Division of Risk Assessment, China National Center for Food Safety Risk Assessment, Beijing, China
| | - Robert J Berry
- National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA
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Jiang J, Zhang Y, Wei L, Sun Z, Liu Z. Association between MTHFD1 G1958A polymorphism and neural tube defects susceptibility: a meta-analysis. PLoS One 2014; 9:e101169. [PMID: 24977710 PMCID: PMC4076264 DOI: 10.1371/journal.pone.0101169] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Accepted: 06/03/2014] [Indexed: 01/11/2023] Open
Abstract
Objectives The methylenetetrahydrofolate dehydrogenase (MTHFD1) gene, as one of the key genes involved in the folate pathway, has been reported to play a critical role in the pathogenesis of neural tube defects (NTDs). However, the results of published studies are contradictory and inconclusive. Thus, this meta-analysis aimed to evaluate the effect of the common polymorphism in the MTHFD1 gene, the G1958A (R653Q, dbSNP ID: rs2236225) variant, on the risk of NTDs in all eligible studies. Methods Relevant literature published before January 3, 2014 was retrieved from the MEDLINE, EMBASE, Cochrane Library, and CBM databases. Pooled crude odds ratios (ORs) and their corresponding 95% confidence intervals (CIs) were calculated to evaluate the association between the MTHFD1 G1958A polymorphism and NTDs risk. Results We performed a meta-analysis of nine studies with a total of 4,302 NTDs patients and 4,238 healthy controls. Our results demonstrated a significant correlation between the MTHFD1 G1958A polymorphism and NTDs in an overall meta-analysis. For family-based studies, the study subjects were classified as NTD cases, mothers with NTDs offspring, and fathers with NTDs offspring. We found no association between any of the fathers’ genotypes and NTDs, whereas there was a clear excess of the 1958A allele in the mothers of children with NTDs compared with controls individuals. Conclusions In summary, our meta-analysis strongly suggests that the MTHFD1 G1958A polymorphism might be associated with maternal risk for NTDs in Caucasian populations. However, the evidence of this association should be interpreted with caution due to the selective nature of publication of genetic association studies.
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Affiliation(s)
- Jianxin Jiang
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai, China
- Department of Neurosurgery, East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Yanfei Zhang
- Department of Neurosurgery, East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Liang Wei
- Department of Neurosurgery, East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Zhiyang Sun
- Department of Neurosurgery, East Hospital, Tongji University School of Medicine, Shanghai, China
- * E-mail: (ZS); (ZL)
| | - Zhongmin Liu
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai, China
- Department of Neurosurgery, East Hospital, Tongji University School of Medicine, Shanghai, China
- * E-mail: (ZS); (ZL)
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Cai B, Zhang T, Zhong R, Zou L, Zhu B, Chen W, Shen N, Ke J, Lou J, Wang Z, Sun Y, Liu L, Song R. Genetic variant in MTRR, but not MTR, is associated with risk of congenital heart disease: an integrated meta-analysis. PLoS One 2014; 9:e89609. [PMID: 24595101 PMCID: PMC3942359 DOI: 10.1371/journal.pone.0089609] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2013] [Accepted: 01/22/2014] [Indexed: 02/07/2023] Open
Abstract
Background Congenital heart disease (CHD) is one of the most common birth defects and the leading cause of deaths among individuals with congenital structural abnormalities worldwide. Both Methionine synthase reductase (MTRR) and Methionine synthase (MTR) are key enzymes involved in the metabolic pathway of homocysteine, which are significant in the earlier period embryogenesis, particularly in the cardiac development. Evidence is mounting for the association between MTRR A66G (rs1801394)/MTR A2756G (rs1805087) and the CHD risk, but results are controversial. Therefore, we conducted a meta-analysis integrating case-control and transmitted disequilibrium test (TDT) studies to obtain more precise estimate of the associations of these two variants with the CHD risk. Methods To combine case-control and TDT studies, we used the Catmap package of R software to calculate odds ratios (ORs) and 95% confidence intervals (CIs). Results A total of 9 reports were included in the final meta-analysis. Eight of them comprised of 914 cases, 964 controls, and 441 families that were germane to MTRR A66G polymorphism; and 4 reports comprised of 250 cases, 205 controls, and 53 families that were relevant to MTR A2756G polymorphism. The pooled OR for the MTRR 66 G allele versus A allele was 1.35 (95% CI = 1.14–1.59, P<0.001, Pheterogeneity = 0.073). For MTR A2756G, the G allele conferred a pooled OR of 1.10 (95% CI = 0.78–1.57, P = 0.597, Pheterogeneity = 0.173) compared with the A allele. Sensitivity analyses were carried out to asses the effects of each individual study on the pooled OR, indicating the stability of the outcome. Moreover, positive results were also obtained in all subgroups stratified by study type and ethnicity except the subgroup of TDT studies in MTRR A66G variant. Conclusions This meta-analysis demonstrated a suggestive result that the A66G variant in MTRR, but not the A2756G in MTR, may be associated with the increase of CHD risks.
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Affiliation(s)
- Bingxi Cai
- Department of Epidemiology and Biostatistics and State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment and Health, Ministry of Environmental Protection Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ti Zhang
- Department of Epidemiology and Biostatistics and State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment and Health, Ministry of Environmental Protection Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Rong Zhong
- Department of Epidemiology and Biostatistics and State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment and Health, Ministry of Environmental Protection Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Li Zou
- Department of Epidemiology and Biostatistics and State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment and Health, Ministry of Environmental Protection Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Beibei Zhu
- Department of Epidemiology and Biostatistics and State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment and Health, Ministry of Environmental Protection Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wei Chen
- Department of Epidemiology and Biostatistics and State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment and Health, Ministry of Environmental Protection Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Na Shen
- Department of Epidemiology and Biostatistics and State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment and Health, Ministry of Environmental Protection Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Juntao Ke
- Department of Epidemiology and Biostatistics and State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment and Health, Ministry of Environmental Protection Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jiao Lou
- Department of Epidemiology and Biostatistics and State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment and Health, Ministry of Environmental Protection Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zhenling Wang
- Department of Epidemiology and Biostatistics and State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment and Health, Ministry of Environmental Protection Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yu Sun
- Department of Epidemiology and Biostatistics and State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment and Health, Ministry of Environmental Protection Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Lifeng Liu
- Department of Epidemiology and Biostatistics and State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment and Health, Ministry of Environmental Protection Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ranran Song
- Department of Maternal and Child Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- * E-mail:
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Salih MA, Murshid WR, Seidahmed MZ. Classification, clinical features, and genetics of neural tube defects. Saudi Med J 2014; 35 Suppl 1:S5-S14. [PMID: 25551113 PMCID: PMC4362100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
Neural tube defects (NTDs) constitute a major health burden (0.5-2/1000 pregnancies worldwide), and remain a preventable cause of still birth, neonatal, and infant death, or significant lifelong handicaps. The malformations result from failure of the neural folds to fuse in the midline, and form the neural tube between the third and the fourth week of embryonic development. This review article discusses their classification, clinical features, and genetics. Most NTDs are sporadic and both genetic, and non-genetic environmental factors are involved in its etiology. Consanguinity was suggested to contribute to the high incidence of NTDs in several countries, including Saudi Arabia. Syndromes, often associated with chromosomal anomalies, account for <10% of all NTDs; but a higher proportion (20%) has been documented in Saudi Arabia. Genetic predisposition constitutes the major underlying risk factor, with a strong implication of genes that regulate folate one-carbon metabolism and planar cell polarity.
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Affiliation(s)
- Mustafa A. Salih
- From the Division of Pediatric Neurology (Salih), Department of Pediatrics, the Division of Neurosurgery (Murshid), Department of Surgery, College of Medicine, King Saud University, and the Neonatology Unit (Seidahmed), Department of Pediatrics, Security Forces Hospital, Riyadh, Kingdom of Saudi Arabia.,Address correspondence and reprint request to: Prof. Mustafa A. M. Salih, Division of Pediatric Neurology, Department of Pediatrics, College of Medicine, King Saud University, PO Box 2925, Riyadh 11461, Kingdom of Saudi Arabia. E-mail:
| | - Waleed R. Murshid
- From the Division of Pediatric Neurology (Salih), Department of Pediatrics, the Division of Neurosurgery (Murshid), Department of Surgery, College of Medicine, King Saud University, and the Neonatology Unit (Seidahmed), Department of Pediatrics, Security Forces Hospital, Riyadh, Kingdom of Saudi Arabia.
| | - Mohammed Z. Seidahmed
- From the Division of Pediatric Neurology (Salih), Department of Pediatrics, the Division of Neurosurgery (Murshid), Department of Surgery, College of Medicine, King Saud University, and the Neonatology Unit (Seidahmed), Department of Pediatrics, Security Forces Hospital, Riyadh, Kingdom of Saudi Arabia.
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