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Reyes L, Godfrey D, Ming LJ, MacLean C, Gonzalez FJ, Madrigal L. The distribution in native populations from Mexico and Central America of the C677T variant in the MTHFR gene. Am J Hum Biol 2021; 33:e23567. [PMID: 33458918 DOI: 10.1002/ajhb.23567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 12/22/2020] [Accepted: 12/24/2020] [Indexed: 11/11/2022] Open
Abstract
OBJECTIVES To explore evolutionary hypotheses for the high frequencies of a substitution in the methylenetetrahydrofolate reductase (MTHFR) gene, in Mexican and Central American Indigenous populations. MATERIALS AND METHODS We obtained allele frequencies for the C677T variant in the MTHFR gene and ecological information for 37 indigenous samples from Mexico and Central America. We calculated Hardy-Weinberg equilibrium and computed Fst statistics. We computed correlations between the samples' allele frequencies and ecological and geochemical variables. RESULTS Many of the samples have extremely high frequencies of the T allele ( q ¯ = 0.62, median = 0.66). In this region, the frequency of the T allele decreases from Southeast to Northwest and is significantly correlated with longitude, latitude, altitude, and insolation. CONCLUSIONS The native people of Central America and Mexico evolved high frequencies of an allele which has been shown to produce deleterious clinical effects including neural tube effects, cardiovascular events, and cancer. This allele has a clinal distribution in the region, perhaps associated with solar irradiation. As (Contreras-Cubas et al., 2016) noted, the traditional diet of these populations, which is high in folate, has likely mitigated the negative effect of the allele. It is of primary importance that their rights to their homeland and traditional diets be respected. It is a matter of Public Health to investigate whether this allele is a factor in the current wave of cardiovascular diseases affecting the majority population of this region, since it descends from the Native peoples and the Mediterranean population, which also has high frequencies of the allele.
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Affiliation(s)
- Lucio Reyes
- Department of Anthropology, University of South Florida, Tampa, Florida, USA
| | - David Godfrey
- Department of Anthropology, University of South Florida, Tampa, Florida, USA
| | - Li-June Ming
- Department of Chemistry, University of South Florida, Tampa, Florida, USA
| | - Caroline MacLean
- Department of Anthropology, University of South Florida, Tampa, Florida, USA
| | | | - Lorena Madrigal
- Department of Anthropology, University of South Florida, Tampa, Florida, USA
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Tailoring Nutritional Advice for Mexicans Based on Prevalence Profiles of Diet-Related Adaptive Gene Polymorphisms. J Pers Med 2017; 7:jpm7040016. [PMID: 29125573 PMCID: PMC5748628 DOI: 10.3390/jpm7040016] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 11/06/2017] [Accepted: 11/08/2017] [Indexed: 12/18/2022] Open
Abstract
Diet-related adaptive gene (DRAG) polymorphisms identified in specific populations are associated with chronic disorders in carriers of the adaptive alleles due to changes in dietary and lifestyle patterns in recent times. Mexico’s population is comprised of Amerindians (AM) and Mestizos who have variable AM, European (EUR) and African genetic ancestry and an increased risk of nutrition-related chronic diseases. Nutritional advice based on the Mexican genome and the traditional food culture is needed to develop preventive and therapeutic strategies. Therefore, we aimed to provide a prevalence profile of several DRAG polymorphisms in the Mexican population, including Central West (CW) Mexico subpopulations. Geographic heat maps were built using ArcGIS10 (Esri, Redlands, CA, USA) software, based on the published data of the MTHFR C677T (rs1801133), ABCA1 Arg230Cys (rs9282541), APOE T388C (rs429358)/C526T (rs7412), LCT C-13910T (rs4988235) polymorphisms and AMY1 copy number variation (CNV). Also, new data obtained by allelic discrimination-real-time polymerase chain reaction (RT-PCR) assays for the MTHFR, ABCA1, and APOE polymorphisms as well as the AMY1 CNV in the CW Mexico subpopulations with different proportions of AM and EUR ancestry were included. In the CW region, the highest frequency of the MTHFR 677T, ABCA1 230C and APOE ε4 adaptive alleles was observed in the AM groups, followed by Mestizos with intermediate AM ancestry. The LCT-13910T allele frequency was highest in Mestizos-EUR but extremely low in AM, while the AMY1 diploid copy number was 6.82 ± 3.3 copies. Overall, the heat maps showed a heterogeneous distribution of the DRAG polymorphisms, in which the AM groups revealed the highest frequencies of the adaptive alleles followed by Mestizos. Given these genetic differences, genome-based nutritional advice should be tailored in a regionalized and individualized manner according to the available foods and Mexican traditional food culture that may lead to a healthier dietary pattern.
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Contreras-Cubas C, Sánchez-Hernández BE, García-Ortiz H, Martínez-Hernández A, Barajas-Olmos F, Cid M, Mendoza-Caamal EC, Centeno-Cruz F, Ortiz-Cruz G, Jiménez-López JC, Córdova EJ, Salas-Bautista EG, Saldaña-Alvarez Y, Fernández-López JC, Mutchinick OM, Orozco L. Heterogenous Distribution of MTHFR Gene Variants among Mestizos and Diverse Amerindian Groups from Mexico. PLoS One 2016; 11:e0163248. [PMID: 27649570 PMCID: PMC5029802 DOI: 10.1371/journal.pone.0163248] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 09/05/2016] [Indexed: 11/18/2022] Open
Abstract
Methylenetetrahydrofolate reductase (MTHFR) is a key enzyme in folate metabolism. Folate deficiency has been related to several conditions, including neural tube defects (NTDs) and cardiovascular diseases. Hence, MTHFR genetic variants have been studied worldwide, particularly the C677T and A1298C. We genotyped the C677T and A1298C MTHFR polymorphisms in Mexican Amerindians (MAs), from the largest sample included in a genetic study (n = 2026, from 62 ethnic groups), and in a geographically-matched Mexican Mestizo population (MEZ, n = 638). The 677T allele was most frequent in Mexican individuals, particularly in MAs. The frequency of this allele in both MAs and MEZs was clearly enriched in the South region of the country, followed by the Central East and South East regions. In contrast, the frequency of the 1298C risk allele in Mexicans was one of the lowest in the world. Both in MAs and MEZs the variants 677T and 1298C displayed opposite allele frequency gradients from southern to northern Mexico. Our findings suggest that in Mestizos the 677T allele was derived from Amerindians while the 1298C allele was a European contribution. Some subgroups showed an allele frequency distribution that highlighted their genetic diversity. Notably, the distribution of the frequency of the 677T allele was consistent with that of the high incidence of NTDs reported in MEZ.
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Affiliation(s)
- Cecilia Contreras-Cubas
- Inmunogenomics and Metabolic Disease Laboratory, Instituto Nacional de Medicina Genómica, SS, Mexico City, Mexico
| | - Beatríz E. Sánchez-Hernández
- Genetic Department, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, SS, Mexico City, Mexico
| | - Humberto García-Ortiz
- Inmunogenomics and Metabolic Disease Laboratory, Instituto Nacional de Medicina Genómica, SS, Mexico City, Mexico
| | - Angélica Martínez-Hernández
- Inmunogenomics and Metabolic Disease Laboratory, Instituto Nacional de Medicina Genómica, SS, Mexico City, Mexico
| | - Francisco Barajas-Olmos
- Inmunogenomics and Metabolic Disease Laboratory, Instituto Nacional de Medicina Genómica, SS, Mexico City, Mexico
| | - Miguel Cid
- Inmunogenomics and Metabolic Disease Laboratory, Instituto Nacional de Medicina Genómica, SS, Mexico City, Mexico
| | - Elvia C. Mendoza-Caamal
- Inmunogenomics and Metabolic Disease Laboratory, Instituto Nacional de Medicina Genómica, SS, Mexico City, Mexico
| | - Federico Centeno-Cruz
- Inmunogenomics and Metabolic Disease Laboratory, Instituto Nacional de Medicina Genómica, SS, Mexico City, Mexico
| | - Gabriela Ortiz-Cruz
- Genetic Department, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, SS, Mexico City, Mexico
| | - José Concepción Jiménez-López
- Physic Anthropology Direction, Instituto Nacional de Antropología e Historia, Museo Nacional de Antropología, Mexico City, Mexico
| | - Emilio J. Córdova
- Inmunogenomics and Metabolic Disease Laboratory, Instituto Nacional de Medicina Genómica, SS, Mexico City, Mexico
| | - Eva Gabriela Salas-Bautista
- Physic Anthropology Direction, Instituto Nacional de Antropología e Historia, Museo Nacional de Antropología, Mexico City, Mexico
| | - Yolanda Saldaña-Alvarez
- Inmunogenomics and Metabolic Disease Laboratory, Instituto Nacional de Medicina Genómica, SS, Mexico City, Mexico
| | | | - Osvaldo M. Mutchinick
- Genetic Department, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, SS, Mexico City, Mexico
| | - Lorena Orozco
- Inmunogenomics and Metabolic Disease Laboratory, Instituto Nacional de Medicina Genómica, SS, Mexico City, Mexico
- * E-mail:
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Association of the methylenetetrahydrofolate reductase (MTHFR) C677T polymorphism with primary glaucoma in Saudi population. BMC Ophthalmol 2016; 16:156. [PMID: 27585654 PMCID: PMC5009653 DOI: 10.1186/s12886-016-0337-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 08/23/2016] [Indexed: 11/18/2022] Open
Abstract
Background Methylenetetrahydrofolate reductase (MTHFR), a critical enzyme in folate metabolism is involved in DNA synthesis, DNA repair and DNA methylation. The functional polymorphism of MTHFR gene, C677T has been shown to impact various diseases and implicated as a risk factor for the development of various neurodegenerative disorders including glaucoma. Methods We investigated MTHFR C677T genotypes and alleles frequencies in primary glaucoma [primary open angle glaucoma (POAG) and primary angle closure glaucoma (PACG)] patients and matched healthy controls in a case-control study. Two hundred ten primary glaucoma cases were studied for MTHFR C677T polymorphism and compared with 280 controls taken from the healthy population, employing the polymerase chain reaction-restriction fragment length polymorphism technique (PCR-RFLP). The MTHFR gene was amplified using specific primers. The PCR products (294 bp) was subsequently digested with HinfI (New England Biolabs) at 37 °C for 12 h, separated by electrophoresis on 2 % agarose gels, and visualized with ethidium bromide staining. The restriction digestion yielded 168 and 126 bp fragments for TT, 294, 168 and 126 bp fragments for CT and undigested PCR product 294 bp indicating CC genotype. Results We found the frequency of the genotypes and alleles of MTHFR C677T differ significantly between cases and controls. The frequencies of allele T and genotype CT were significantly higher while the frequencies of allele C and genotype CC were lower in primary glaucoma patients as compared to controls (p <0.05). Upon stratification of our results into POAG and PACG, significantly higher frequencies of allele T (19.44 %) and genotype CT (38.89 %) were found in POAG patients compared to controls (12.5 % and 25 % respectively). The frequencies of alleles and genotypes were almost similar in PACG and controls (p = 0.8). Conclusion This study indicates that the allele T and genotype CT of MTHFR C677T polymorphism are significantly associated with POAG while allele C and CC genotype may be protective for it. We conclude that the MTHFR C677T polymorphism increases the risk for POAG development in Saudi population and can be a genetic marker however, further studies are needed with multiple-ethnic populations affected with POAG to strengthen these findings.
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Field MS, Kamynina E, Watkins D, Rosenblatt DS, Stover PJ. New insights into the metabolic and nutritional determinants of severe combined immunodeficiency. Rare Dis 2015; 3:e1112479. [PMID: 27123375 PMCID: PMC4817835 DOI: 10.1080/21675511.2015.1112479] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 09/20/2015] [Accepted: 10/19/2015] [Indexed: 11/07/2022] Open
Abstract
Human mutations in MTHFD1 have recently been identified in patients with severe
combined immunodeficiency (SCID). SCID results from inborn errors of metabolism
that cause impaired T- and B-cell proliferation and function. One of the most
common causes of SCID is adenosine deaminase (ADA) deficiency, which ultimately
inhibits DNA synthesis and cell division. MTHFD1 has been shown to translocate
to the nucleus during S-phase of the cell cycle; this localization is critical
for synthesis of thymidyate (dTMP or the “T” base in DNA) and
subsequent progression through the cell cycle and cell proliferation.
Identification of MTHFD1 mutations that are associated with
SCID highlights the potential importance of adequate dTMP synthesis in the
etiology of SCID.
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Affiliation(s)
- Martha S Field
- Division of Nutritional Sciences; Cornell University ; Ithaca, NY USA
| | - Elena Kamynina
- Division of Nutritional Sciences; Cornell University ; Ithaca, NY USA
| | - David Watkins
- Department of Human Genetics, McGill University; Department of Medical Genetics; McGill University Health Center ; Montreal, Quebec, Canada
| | - David S Rosenblatt
- Department of Human Genetics, McGill University; Department of Medical Genetics; McGill University Health Center ; Montreal, Quebec, Canada
| | - Patrick J Stover
- Division of Nutritional Sciences; Cornell University; Ithaca, NY USA; Graduate Field of Biochemistry; Molecular and Cell Biology; Cornell University; Ithaca, NY USA
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