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Ginani CTA, da Luz JRD, de Medeiros KS, Sarmento ACA, Coppedè F, das Graças Almeida M. Association of C677T and A1298C polymorphisms of the MTHFR gene with maternal risk for Down syndrome: A meta-analysis of case-control studies. MUTATION RESEARCH. REVIEWS IN MUTATION RESEARCH 2023; 792:108470. [PMID: 37689109 DOI: 10.1016/j.mrrev.2023.108470] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 09/06/2023] [Accepted: 09/06/2023] [Indexed: 09/11/2023]
Abstract
BACKGROUND Several studies around the world support the hypothesis that genetic polymorphisms involved in folate metabolism could be related to the maternal risk for Down syndrome (DS). Most of them investigated the role of MTHFR C677T and/or A1298C polymorphisms as maternal risk factors for DS, but their results are often conflicting and still inconclusive. METHODS We conducted a systematic review and meta-analysis to clarify the association of MTHFR C677T and/or A1298C polymorphisms with the maternal risk of DS. Our search strategy selected 42 eligible case control studies for a total of 4131 case mothers and 5452 control mothers. The Newcastle-Ottawa Scale was used to assess the methodological quality of the selected studies. To assess the confidence of statistically significant associations we applied false positive report probability test, and we performed the trial sequential analysis to minimize the type I error and random error. RESULTS We observed significant associations between the MTHFR C677T polymorphism and maternal risk for DS for each of the genetic models investigated (dominant, recessive, codominant, and allelic contrast). Subgroup analysis by region revelated significant association in the Asian population for all the genetic models investigated. Significant associations were also found for certain genetic models in North American, South American, and Middle Eastern populations, while no association was observed in Europeans. The MTHFR A1298C polymorphism did not show any association with the maternal risk of DS, either alone or in combination with the C677T one. The results of false positive report probability to verify the confidence of a significant association suggest that the association between the MTHFR C677T polymorphism and the maternal risk for DS is noteworthy, with high confidence in Asians. CONCLUSION The results of this meta-analysis support that the MTHFR C677T polymorphism, but not the A1298C one, is associated with the maternal risk for DS. Further studies are required to better characterize the contribution of gene-gene and gene-nutrient interactions as well as those of other regional or ethnic factors that could explain the observed different effect size in different populations.
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Affiliation(s)
- Carla Talita Azevedo Ginani
- Post-graduation Program in Health Sciences, Federal University of Rio Grande do Norte, Health Sciences Center, Natal, Rio Grande do Norte, Brazil; Multidisciplinary Research Laboratory, DACT, Health Sciences Center, Federal University of Rio Grande do Norte, Natal, Brazil
| | - Jefferson Romáryo Duarte da Luz
- Organic Chemistry and biochemistry Laboratory, State University of Amapá (UEAP), Macapá, Brazil; Institute of Education, Research and Innovation of the League Against Cancer, Natal, Rio Grande do Norte, Brazil
| | - Kleyton Santos de Medeiros
- Institute of Education, Research and Innovation of the League against Cancer, Natal, Rio Grande do Norte, Brazil
| | - Ayane Cristine Alves Sarmento
- Post-graduation Program in Health Sciences, Federal University of Rio Grande do Norte, Health Sciences Center, Natal, Rio Grande do Norte, Brazil
| | - Fabio Coppedè
- Department of Translational Research and of New Surgical and Medical Technologies, University of Pisa, Via Roma 55, 56126 Pisa, Italy; Interdepartmental Research Center of Biology and Pathology of Aging, University of Pisa, Via Savi 10, 56126 Pisa, Italy.
| | - Maria das Graças Almeida
- Post-graduation Program in Health Sciences, Federal University of Rio Grande do Norte, Health Sciences Center, Natal, Rio Grande do Norte, Brazil; Multidisciplinary Research Laboratory, DACT, Health Sciences Center, Federal University of Rio Grande do Norte, Natal, Brazil.
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Genetic aetiology of Down syndrome birth: novel variants of maternal DNMT3B and RFC1 genes increase risk of meiosis II nondisjunction in the oocyte. Mol Genet Genomics 2023; 298:293-313. [PMID: 36447056 DOI: 10.1007/s00438-022-01981-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 11/15/2022] [Indexed: 12/05/2022]
Abstract
The aim of the present work was to explore the intriguing association of maternal folate regulator gene polymorphisms and mutations with the incidence of chromosome 21 nondisjunction and Down syndrome birth. We tested polymorphisms/mutations of DNMT3B and RFC1 genes for their association with meiotic errors in oocyte among the 1215 Down syndrome child-bearing women and 900 controls. We observed that 23 out of 31 variants of DNMT3B and RFC1 exhibited an association with meiosis II nondisjunction in maternal age-independent manner. Additionally, we have reported 17 novel mutations and 1 novel polymorphic variant that are unique to the Indian Bengali speaking cohort and increased odds in favour of meiosis II nondisjunction. We hypothesize that the risk variants and mutations of DNMT3B and RFC1 genes may cause reduction in two or more recombination events and also cause peri-centromeric single exchange that increases the risk of nondisjunction at any age of women. In silico analyses predicted the probable damages of the transcripts or proteins from the respective genes owing to the said polymorphisms. These findings from the largest population sample tested ever revealed that mutations/polymorphisms of the genes DNMT3B and RFC1 impair recombination that leads to chromosome 21 nondisjunction in the oocyte at meiosis II stage and bring us a significant step closer towards understanding the aetiology of chromosome 21 nondisjunction and birth of a child with Down syndrome to women at any age.
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Ginani CTA, da Luz JRD, Silva SVE, Coppedè F, Almeida MDG. Association between MTHFR C677T and A1298C gene polymorphisms and maternal risk for Down syndrome: A protocol for systematic review and/or meta-analysis. Medicine (Baltimore) 2022; 101:e28293. [PMID: 35060496 PMCID: PMC8772651 DOI: 10.1097/md.0000000000028293] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 11/29/2021] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Down syndrome (DS) is one of the most common chromosomal abnormalities among live-born babies and one of the best-known intellectual disability disorders in humans. Errors leading to trisomy 21 are primarily arising from defects in chromosomal segregation during maternal meiosis (about 88% of cases), and the focus of many investigations has been to identify maternal risk factors favoring chromosome 21 malsegregation during oogenesis. Maternal polymorphisms of genes required for folate metabolism are the most investigated risk factors for the birth of children with DS. Through this review, we sought to investigate the association of the polymorphisms "C677T" and "A1298C" of the MTHFR gene with maternal risk for DS. METHODS We will use the databases PubMed, Embase, Scopus and Web of Science to search for case-control studies published from 1999 up to September 2021 without language restriction. Results will be presented as relative risks and 95% confidence intervals for dichotomous outcomes and mean differences, or standardized mean differences along with 95% confidence intervals, for continuous outcomes. The all data synthesis will be analyzed on the Review Manager 5.2 version software. RESULTS This study will be able to clarify all the doubts we seek and that it will be able to provide accurate data that will be able to describe how these polymorphisms can act to increase the predisposition for the birth of children with DS in different populations and under different dietary conditions. CONCLUSIONS This study will clarify the relationship between C677T and A1298C polymorphisms MTHFR gene with increased the maternal risk for Down syndrome. REGISTRATION This systematic review and meta-analysis protocol has been registered on the Prospective Registry of International Systematic Review and Meta-analyses: CRD42021269338.
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Affiliation(s)
- Carla Talita Azevedo Ginani
- Post-graduation Program in Health Sciences, Federal University of Rio Grande do Norte, Health Sciences Center, Natal, Rio Grande do Norte, Brazil
- Multidisciplinary Research Laboratory, DACT, Health Sciences Center, Federal University of Rio Grande do Norte, Natal, Brazil
| | - Jefferson Romáryo Duarte da Luz
- Post-graduation Program in Health Sciences, Federal University of Rio Grande do Norte, Health Sciences Center, Natal, Rio Grande do Norte, Brazil
- Multidisciplinary Research Laboratory, DACT, Health Sciences Center, Federal University of Rio Grande do Norte, Natal, Brazil
| | - Saulo Victor e Silva
- Multidisciplinary Research Laboratory, DACT, Health Sciences Center, Federal University of Rio Grande do Norte, Natal, Brazil
- Post-graduation Program in Pharmaceutical Sciences, Health Sciences Center, Federal University of Rio Grande do Norte, Natal/RN, Brazil
| | - Fabio Coppedè
- Department of Translational Research and of New Surgical and Medical Technologies, University of Pisa, Pisa, Italy
- Interdepartmental Research Center Nutrafood “Nutraceuticals and Food for Health”, University of Pisa, Pisa, Italy
| | - Maria das Graças Almeida
- Post-graduation Program in Health Sciences, Federal University of Rio Grande do Norte, Health Sciences Center, Natal, Rio Grande do Norte, Brazil
- Multidisciplinary Research Laboratory, DACT, Health Sciences Center, Federal University of Rio Grande do Norte, Natal, Brazil
- Post-graduation Program in Pharmaceutical Sciences, Health Sciences Center, Federal University of Rio Grande do Norte, Natal/RN, Brazil
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Mendes CC, Zampieri BL, Arantes LMRB, Melendez ME, Biselli JM, Carvalho AL, Eberlin MN, Riccio MF, Vannucchi H, Carvalho VM, Goloni-Bertollo EM, Pavarino ÉC. One-carbon metabolism and global DNA methylation in mothers of individuals with Down syndrome. Hum Cell 2021; 34:1671-1681. [PMID: 34410622 DOI: 10.1007/s13577-021-00586-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 07/26/2021] [Indexed: 10/20/2022]
Abstract
Down syndrome (DS) is the most common chromosomal disorder, resulting from the failure of normal chromosome 21 segregation. Studies have suggested that impairments within the one-carbon metabolic pathway can be of relevance for the global genome instability observed in mothers of individuals with DS. Based on the association between global DNA hypomethylation, genome instability, and impairments within the one-carbon metabolic pathway, the present study aimed to identify possible predictors, within the one-carbon metabolism, of global DNA methylation, measured by methylation patterns of LINE-1 and Alu repetitive sequences, in mothers of individuals with DS and mothers of individuals without the syndrome. In addition, we investigated one-carbon genetic polymorphisms and metabolites as maternal predisposing factors for the occurrence of trisomy 21 in children. Eighty-three samples of mothers of children with DS with karyotypically confirmed free trisomy 21 (case group) and 84 of mothers who had at least one child without DS or any other aneuploidy were included in the study. Pyrosequencing assays were performed to access global methylation. The results showed that group affiliation (case or control), betaine-homocysteine methyltransferase (BHMT) G742A and transcobalamin 2 (TCN2) C776G polymorphisms, and folate concentration were identified as predictors of global Alu DNA methylation values. In addition, thymidylate synthase (TYMS) 28-bp repeats 2R/3R or 3R/3R genotypes are independent maternal predisposing factors for having a child with DS. This study adds evidence that supports the association of impairments in the one-carbon metabolism, global DNA methylation, and the possibility of having a child with DS.
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Affiliation(s)
- Cristiani Cortez Mendes
- Unidade de Pesquisa em Genética e Biologia Molecular-UPGEM, Departamento de Biologia Molecular, Faculdade de Medicina de São José do Rio Preto-FAMERP, São José do Rio Preto, São Paulo, Brazil
| | | | | | - Matias Eliseo Melendez
- Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, São Paulo, Brazil
| | - Joice Matos Biselli
- Universidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Biociências, Letras e Ciências Exatas de São José do Rio Preto, Departamento de Ciências Biológicas, São José do Rio Preto, São Paulo, Brazil
| | - André Lopes Carvalho
- Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, São Paulo, Brazil
| | - Marcos Nogueira Eberlin
- Universidade Presbiteriana Mackenzie, Discovery-Mackenzie-Núcleo Mackenzie de Pesquisa, Núcleo Mackenzie de Pesquisas em Ciência, Fé e Sociedade, São Paulo, São Paulo, Brazil
| | | | - Hélio Vannucchi
- Laboratório de Nutrição, Departamento de Clínica Médica, Faculdade de Medicina de Ribeirão Preto-USP, Ribeirão Preto, São Paulo, Brazil
| | | | - Eny Maria Goloni-Bertollo
- Unidade de Pesquisa em Genética e Biologia Molecular-UPGEM, Departamento de Biologia Molecular, Faculdade de Medicina de São José do Rio Preto-FAMERP, São José do Rio Preto, São Paulo, Brazil
| | - Érika Cristina Pavarino
- Unidade de Pesquisa em Genética e Biologia Molecular-UPGEM, Departamento de Biologia Molecular, Faculdade de Medicina de São José do Rio Preto-FAMERP, São José do Rio Preto, São Paulo, Brazil.
- , Av. Brigadeiro Faria Lima, 5416, Vila São Pedro, São José do Rio Preto, São Paulo, 15090-000, Brazil.
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