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Pan D, Su M, Xu D, Wang Y, Gao H, Smith JD, Sun J, Wang X, Yan Q, Song G, Lu Y, Feng W, Wang S, Sun G. Exploring the Interplay Between Vitamin B 12-related Biomarkers, DNA Methylation, and Gene-Nutrition Interaction in Esophageal Precancerous Lesions. Arch Med Res 2023; 54:102889. [PMID: 37738887 DOI: 10.1016/j.arcmed.2023.102889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 06/29/2023] [Accepted: 08/31/2023] [Indexed: 09/24/2023]
Abstract
BACKGROUND Vitamin B12 depletion has been suggested to be associated with esophageal precancerous lesions (EPL). However, the potential mechanisms remain unclear. AIMS This study aims to evaluate the role of vitamin B12 and its regulated epigenetic modification in EPL and provide preliminary information on the identification of potential molecular biomarkers for the early prediction of EPL. METHODS We collected information and samples from the Early Diagnosis and Early Treatment Project of Esophageal Cancer database from 200 EPL cases and 200 matched controls. Vitamin B12, one-carbon metabolism biomarkers, genetic polymorphism of TCN2 C776G, and DNA methylation were compared. Preliminarily identified candidate promoters of differentially methylated CpG positions were further verified by targeted bisulfite sequencing. RESULTS EPL cases had significantly lower serum levels of vitamin B12 and transcobalamin II, and higher serum levels of homocysteine and 5-methyltetrahydrofolate than controls. The TCN2 C776G polymorphism was found to be associated with susceptibility to EPL and may interact with vitamin B12 nutritional status to influence the risk of EPL in male subjects. In addition, global hypomethylation related to vitamin B12 depletion was observed in EPL cases, along with region-specific hypermethylation of UGT2B15 and FGFR2 promoters. CONCLUSIONS This study suggests that vitamin B12 depletion may be associated with aberrant DNA methylation and increased risk of EPL through the one-carbon metabolism pathway, presents that the TCN2 C776G polymorphism may interact with vitamin B12 nutritional status to affect EPL risk in males, and also identifies specific locations in the UGT2B15 and FGFR2 promoters with potential as promising molecular biomarkers.
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Affiliation(s)
- Da Pan
- Key Laboratory of Environmental Medicine and Engineering of the Ministry of Education, and Department of Nutrition and Food Hygiene, School of Public Health, Southeast University, Nanjing, PR China
| | - Ming Su
- Huai'an District Center for Disease Control and Prevention, Huai'an, PR China
| | - Dengfeng Xu
- Key Laboratory of Environmental Medicine and Engineering of the Ministry of Education, and Department of Nutrition and Food Hygiene, School of Public Health, Southeast University, Nanjing, PR China
| | - Yuanyuan Wang
- Key Laboratory of Environmental Medicine and Engineering of the Ministry of Education, and Department of Nutrition and Food Hygiene, School of Public Health, Southeast University, Nanjing, PR China
| | - Han Gao
- Department of Biomedical Engineering, University Medical Center Groningen/University of Groningen, The Netherlands; Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | | | - Jihan Sun
- Key Laboratory of Environmental Medicine and Engineering of the Ministry of Education, and Department of Nutrition and Food Hygiene, School of Public Health, Southeast University, Nanjing, PR China
| | - Xin Wang
- Huai'an District Center for Disease Control and Prevention, Huai'an, PR China
| | - Qingyang Yan
- Huai'an District Center for Disease Control and Prevention, Huai'an, PR China
| | - Guang Song
- Huai'an District Center for Disease Control and Prevention, Huai'an, PR China
| | - Yifei Lu
- Key Laboratory of Environmental Medicine and Engineering of the Ministry of Education, and Department of Nutrition and Food Hygiene, School of Public Health, Southeast University, Nanjing, PR China
| | - Wuqiong Feng
- Huai'an District Center for Disease Control and Prevention, Huai'an, PR China
| | - Shaokang Wang
- Key Laboratory of Environmental Medicine and Engineering of the Ministry of Education, and Department of Nutrition and Food Hygiene, School of Public Health, Southeast University, Nanjing, PR China; School of Medicine, Xizang Minzu University, Xianyang, PR China
| | - Guiju Sun
- Key Laboratory of Environmental Medicine and Engineering of the Ministry of Education, and Department of Nutrition and Food Hygiene, School of Public Health, Southeast University, Nanjing, PR China.
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Martino F, Magenta A, Troccoli ML, Martino E, Torromeo C, Putotto C, Barillà F. Long-term outcome of a patient with Transcobalamin deficiency caused by the homozygous c.1115_1116delCA mutation in TCN2 gene: a case report. Ital J Pediatr 2021; 47:54. [PMID: 33685478 PMCID: PMC7941906 DOI: 10.1186/s13052-021-01007-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 02/22/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Transcobalamin deficiency is a rare autosomal recessive inborn error of cobalamin transport (prevalence: < 1/1000000) which clinically manifests in early infancy. CASE PRESENTATION We describe the case of a 31 years old woman who at the age of 30 days presented with the classical clinical and laboratory signs of an inborn error of vitamin B12 metabolism. Family history revealed a sister who died at the age of 3 months with a similar clinical syndrome and with pancytopenia. She was started on empirical intramuscular (IM) cobalamin supplements (injections of hydroxocobalamin 1 mg/day for 1 week and then 1 mg twice a week) and several transfusions of washed and concentrated red blood cells. With these treatments a clear improvement in symptoms was observed, with the disappearance of vomiting, diarrhea and normalization of the full blood count. At 8 years of age injections were stopped for about two and a half months causing the appearance of pancytopenia. IM hydroxocobalamin was then restarted sine die. The definitive diagnosis could only be established at 29 years of age when a genetic evaluation revealed the homozygous c.1115_1116delCA mutation of TCN2 gene (p.Q373GfsX38). Currently she is healthy and she is taking 1 mg of IM hydroxocobalamin once a week. CONCLUSIONS Our case report highlights that early detection of TC deficiency and early initiation of aggressive IM treatment is likely associated with disease control and an overall favorable outcome.
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Affiliation(s)
- Francesco Martino
- Department of Pediatrics Gynecology and Obstetrics, Sapienza University of Rome, Viale Regina Elena 324, 00161, Rome, Italy.
| | - Alessandra Magenta
- National Research Council of Italy (CNR), Institute of Translational Pharmacology IFT, Via Fosso del Cavaliere 100, 00133, Rome, Italy
| | - Maria Letizia Troccoli
- Clinical Analysis and Biochemistry Laboratory, Sant'Andrea Hospital, Via di Grottarossa, 1035/1039, 00189, Rome, Italy
| | - Eliana Martino
- Department of Pediatrics Gynecology and Obstetrics, Sapienza University of Rome, Viale Regina Elena 324, 00161, Rome, Italy
| | - Concetta Torromeo
- Department of Cardiovascular, Respiratory, Nephrology, Anesthesiology and Geriatric Sciences, Sapienza University of Rome, Viale del Policlinico 155, 00161, Rome, Italy
| | - Carolina Putotto
- Department of Pediatrics Gynecology and Obstetrics, Sapienza University of Rome, Viale Regina Elena 324, 00161, Rome, Italy
| | - Francesco Barillà
- Department of Cardiovascular, Respiratory, Nephrology, Anesthesiology and Geriatric Sciences, Sapienza University of Rome, Viale del Policlinico 155, 00161, Rome, Italy
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Lyon P, Strippoli V, Fang B, Cimmino L. B Vitamins and One-Carbon Metabolism: Implications in Human Health and Disease. Nutrients 2020; 12:E2867. [PMID: 32961717 PMCID: PMC7551072 DOI: 10.3390/nu12092867] [Citation(s) in RCA: 127] [Impact Index Per Article: 31.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 09/17/2020] [Accepted: 09/17/2020] [Indexed: 12/17/2022] Open
Abstract
Vitamins B9 (folate) and B12 are essential water-soluble vitamins that play a crucial role in the maintenance of one-carbon metabolism: a set of interconnected biochemical pathways driven by folate and methionine to generate methyl groups for use in DNA synthesis, amino acid homeostasis, antioxidant generation, and epigenetic regulation. Dietary deficiencies in B9 and B12, or genetic polymorphisms that influence the activity of enzymes involved in the folate or methionine cycles, are known to cause developmental defects, impair cognitive function, or block normal blood production. Nutritional deficiencies have historically been treated with dietary supplementation or high-dose parenteral administration that can reverse symptoms in the majority of cases. Elevated levels of these vitamins have more recently been shown to correlate with immune dysfunction, cancer, and increased mortality. Therapies that specifically target one-carbon metabolism are therefore currently being explored for the treatment of immune disorders and cancer. In this review, we will highlight recent studies aimed at elucidating the role of folate, B12, and methionine in one-carbon metabolism during normal cellular processes and in the context of disease progression.
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Affiliation(s)
- Peter Lyon
- Department of Biochemistry and Molecular Biology, Miller School of Medicine, University of Miami, Miami, FL 33136, USA; (P.L.); (V.S.); (B.F.)
- Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, FL 33136, USA
| | - Victoria Strippoli
- Department of Biochemistry and Molecular Biology, Miller School of Medicine, University of Miami, Miami, FL 33136, USA; (P.L.); (V.S.); (B.F.)
- Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, FL 33136, USA
| | - Byron Fang
- Department of Biochemistry and Molecular Biology, Miller School of Medicine, University of Miami, Miami, FL 33136, USA; (P.L.); (V.S.); (B.F.)
- Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, FL 33136, USA
| | - Luisa Cimmino
- Department of Biochemistry and Molecular Biology, Miller School of Medicine, University of Miami, Miami, FL 33136, USA; (P.L.); (V.S.); (B.F.)
- Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, FL 33136, USA
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Liu J, Jiang Y, Liu D, Zhang H, Chen T, Zhang G, Liu H, DU S, Lin Z, Jin Y, Li X. Relationship between cobalt transporter II gene rs9606756 site mutant and serum homocysteine level and recurrent cerebral infarction in young and middle-aged people. Minerva Med 2020; 112:261-268. [PMID: 32207595 DOI: 10.23736/s0026-4806.20.06462-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND This study aimed to investigate the effect of cobalt transporter II gene (rs1801198, rs2301957, rs9606756) polymorphism on serum homocysteine level and its correlation with young and middle recurrent cerebral infarction. METHODS A total of 348 young and middle-aged patients with cerebral infarction admitted to The Third Affiliated Hospital of Qiqihar Medical University from January 2017 to March 2018 were enrolled. The patients were divided into recurrent and non-recurrent groups according to follow-up. DNA was extracted from the peripheral blood of patients, and the DNA samples were genotyped by IlluminaBeadArray technology to detect the gene polymorphisms of cobalt transporter II (TCN2) sites (rs1801198, rs2301957, rs9606756), and the homocysteine (hcy) level was determined by cyclic enzymatic method. VitB12 and folate levels were measured by chemiluminescence immunoassay, and holo transcobalamin (holoTC) expression levels were detected by enzyme-linked immunosorbent assay. RESULTS The frequency of alleles of rs9606756 mutation in the recurrent group was higher than that in the non-recurrent group (P<0.05), and the Hcy level in rs9606756 locus genotype AG+GG was significantly higher than the AA genotype in the recurrent group (P=0.031). Pearson correlation analysis showed that Hcy levels were associated with different genotypes of rs9606756 in the recurrent group (r=0.483, P=0.0003). The rs9606756 allele AA in SH-SY5Y cells was replaced with GG by point mutation experiment. The Hcy metabolism levels of wild and mutant cells were detected. The accumulation level of Hcy in the mutant group was significantly increased (P=0.007). The holoTC in the supernatant was significantly reduced in the mutant (P=0.032). CONCLUSIONS The TCN2 gene rs9606756 mutation is closely related to the level of Hcy metabolism in young and middle-aged patients, which may affect the recurrence of cerebral infarction. It is of great significance to further understand the pathogenesis, prevention and treatment of recurrent cerebral infarction in young and middle-aged patients.
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Affiliation(s)
- Jing Liu
- Department of Neurology, The Third Affiliated Hospital of Qiqihar Medical University, Qiqihar, China
| | - Yan Jiang
- Department of Neurology, The Third Affiliated Hospital of Qiqihar Medical University, Qiqihar, China
| | - Deshui Liu
- Institute of Medical Sciences, Qiqihar Medical University, Qiqihar, China
| | - Hao Zhang
- Institute of Medical Sciences, Qiqihar Medical University, Qiqihar, China
| | - Tuantuan Chen
- Department of Neurology, The Third Affiliated Hospital of Qiqihar Medical University, Qiqihar, China
| | - Guangping Zhang
- Department of Neurology, The Third Affiliated Hospital of Qiqihar Medical University, Qiqihar, China
| | - Hongbin Liu
- Department of Neurology, The Third Affiliated Hospital of Qiqihar Medical University, Qiqihar, China
| | - Shu DU
- Department of Neurology, The Third Affiliated Hospital of Qiqihar Medical University, Qiqihar, China
| | - Zaihong Lin
- Department of Neurology, The Third Affiliated Hospital of Qiqihar Medical University, Qiqihar, China
| | - Yan Jin
- Department of Neurology, The Third Affiliated Hospital of Qiqihar Medical University, Qiqihar, China
| | - Xiaohua Li
- Department of Neurology, The Third Affiliated Hospital of Qiqihar Medical University, Qiqihar, China -
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Park HS, Kim JO, An HJ, Ryu CS, Ko EJ, Kim YR, Ahn EH, Lee WS, Kim JH, Kim NK. Genetic polymorphisms of the cobalamin transport system are associated with idiopathic recurrent implantation failure. J Assist Reprod Genet 2019; 36:1513-1522. [PMID: 31123954 DOI: 10.1007/s10815-019-01455-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 04/16/2019] [Indexed: 12/15/2022] Open
Abstract
PURPOSE Vitamin B12 (cobalamin, Cbl) plays a role in the recycling of folate, which is important in pregnancy. Transcobalamin II (TCN2) and transcobalamin receptor (TCblR) proteins are involved in the cellular uptake of Cbl. TCN2 binds Cbl in the plasma, and TCblR binds TCN2-Cbl at the cell surface. Therefore, we investigated the potential association between polymorphisms in Cbl transport proteins, TCN2 and TCblR, and recurrent implantation failure (RIF) susceptibility. METHODS The genotypes of TCN2 67A>G, TCN2 776C>G, and TCblR 1104C>T were determined for RIF patients and healthy controls using a polymerase chain reaction restriction fragment length polymorphism assay. Additionally, statistical analysis was performed to compare the genotype frequencies between RIF patients and controls. RESULTS The TCN2 67 polymorphism AG type was associated with RIF risk. Some allele combinations that contained the TCN2 67 polymorphism G allele were associated with increased RIF risk, whereas other allele combinations that contained the TCblR 1104 polymorphism T alleles were associated with decreased RIF risk. In genotype combination analysis, two combinations containing the TCN2 67 polymorphism AG type were associated with RIF risk. CONCLUSION Our study showed that the polymorphisms of TCN2 and TCblR are associated with RIF and are potential genetic predisposing factors for RIF among Korean women. Additionally, our findings support a potential role for TCN2 and TCblR in RIF among Korean women. However, further studies are required to investigate the role of the polymorphisms in those proteins and RIF because the roles of the TCN2 and TCblR polymorphisms in RIF are not clear.
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Affiliation(s)
- Han Sung Park
- Department of Biomedical Science, College of Life Science, CHA University, 355, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 13488, Republic of Korea
| | - Jung Oh Kim
- Department of Biomedical Science, College of Life Science, CHA University, 355, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 13488, Republic of Korea
| | - Hui Jeong An
- Department of Biomedical Science, College of Life Science, CHA University, 355, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 13488, Republic of Korea
| | - Chang Soo Ryu
- Department of Biomedical Science, College of Life Science, CHA University, 355, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 13488, Republic of Korea
| | - Eun Ju Ko
- Department of Biomedical Science, College of Life Science, CHA University, 355, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 13488, Republic of Korea
| | - Young Ran Kim
- Department of Obstetrics and Gynecology, CHA Bundang Medical Center, CHA University, 11, Yatap-ro 65beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, 13496, Republic of Korea
| | - Eun Hee Ahn
- Department of Obstetrics and Gynecology, CHA Bundang Medical Center, CHA University, 11, Yatap-ro 65beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, 13496, Republic of Korea
| | - Woo Sik Lee
- Fertility Center of CHA Gangnam Medical Center, CHA University, 566, Nonhyeon-ro, Gangnam-gu, Seoul, 06135, Republic of Korea
| | - Ji Hyang Kim
- Department of Obstetrics and Gynecology, CHA Bundang Medical Center, CHA University, 11, Yatap-ro 65beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, 13496, Republic of Korea.
| | - Nam Keun Kim
- Department of Biomedical Science, College of Life Science, CHA University, 355, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 13488, Republic of Korea.
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Al-Batayneh KM, Salim Al Zoubi M, Al-Trad B, Hussein E, Al Khateeb W, Aljabali AAA, Bodoor K, Shehab M, Al Hamad MA, Eaton GJ, Cornelison CT. Homologous G776G Variant of Transcobalamin-II Gene is Linked to Vitamin B12 Deficiency. INT J VITAM NUTR RES 2019; 90:151-155. [PMID: 30761942 DOI: 10.1024/0300-9831/a000536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Vitamin B12 (Cobalamin) deficiency, due to improper internalization of cobalamin, is a metabolic disorder prevalent in impoverished and elderly populations and is associated with megaloblastic anemia and dementia. It has been suggested that mutations in transcobalamin II (TCN2) or gastric intrinsic factor (GIF) proteins can alter their binding efficiency to cobalamin or reduce the ability of their receptors to internalize them. In this case-control study, the correlation between vitamin B12 deficiency and alternative alleles of TCN2 and GIF was investigated in a Jordanian population. One hundred individuals with vitamin B12 deficiency (B12 < 200 mg/mL) were enrolled in our study to evaluate the TCN2 and GIF polymorphisms. The control group (B12 > 200 mg/mL) included 100 individuals. Our results indicated a significant association between the homologous variant of the TCN2 gene (G776G) and vitamin B12 deficiency, and an intermediate phenotype in heterozygous individuals (p < 0.001, OR = 5.6, 95% CI = 2.95 to 10.63). The GIF gene, however, showed no correlation between the A68G variant and vitamin B12 deficiency (p = 0.2). This study expounds the association of TCN2 polymorphism with cobalamin levels in a Jordanian population and highlights the necessity of further studies to elucidate the molecular basis and impact of TCN2 and GIF genes polymorphisms on vitamin B12 deficiency and associated disorders.
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Affiliation(s)
- Khalid M Al-Batayneh
- Department of Biological Sciences, Faculty of Science, Yarmouk University, Irbid, Jordan
| | - Mazhar Salim Al Zoubi
- Department of Biological Sciences, Faculty of Science, Yarmouk University, Irbid, Jordan.,Department of Basic Medical Sciences, Faculty of Medicine, Yarmouk University, Irbid, Jordan
| | - Bahaa Al-Trad
- Department of Biological Sciences, Faculty of Science, Yarmouk University, Irbid, Jordan
| | - Emad Hussein
- Department of Biological Sciences, Faculty of Science, Yarmouk University, Irbid, Jordan.,Department of Food Science and Human Nutrition, College of Applied Sciences, A'Sharqiyah University, Ibra, Oman
| | - Wesam Al Khateeb
- Department of Biological Sciences, Faculty of Science, Yarmouk University, Irbid, Jordan
| | | | - Khaldon Bodoor
- Department of Applied Biology, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid, Jordan
| | - Murad Shehab
- Department of Biological Sciences, Faculty of Science, Yarmouk University, Irbid, Jordan
| | - Mohammad A Al Hamad
- Department of Pathology, College of Medicine, Imam Abdulrahman Bin Faisal University (IAU), Dammam, Kingdom of Saudi Arabia
| | - Greg J Eaton
- Department of Biological Sciences, Rowan University, New Jersey, USA
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Allen LH, Miller JW, de Groot L, Rosenberg IH, Smith AD, Refsum H, Raiten DJ. Biomarkers of Nutrition for Development (BOND): Vitamin B-12 Review. J Nutr 2018; 148:1995S-2027S. [PMID: 30500928 PMCID: PMC6297555 DOI: 10.1093/jn/nxy201] [Citation(s) in RCA: 145] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 07/06/2017] [Accepted: 08/02/2018] [Indexed: 12/31/2022] Open
Abstract
This report on vitamin B-12 (B12) is part of the Biomarkers of Nutrition for Development (BOND) Project, which provides state-of-the art information and advice on the selection, use, and interpretation of biomarkers of nutrient exposure, status, and function. As with the other 5 reports in this series, which focused on iodine, folate, zinc, iron, and vitamin A, this B12 report was developed with the assistance of an expert panel (BOND B12 EP) and other experts who provided information during a consultation. The experts reviewed the existing literature in depth in order to consolidate existing relevant information on the biology of B12, including known and possible effects of insufficiency, and available and potential biomarkers of status. Unlike the situation for the other 5 nutrients reviewed during the BOND project, there has been relatively little previous attention paid to B12 status and its biomarkers, so this report is a landmark in terms of the consolidation and interpretation of the available information on B12 nutrition. Historically, most focus has been on diagnosis and treatment of clinical symptoms of B12 deficiency, which result primarily from pernicious anemia or strict vegetarianism. More recently, we have become aware of the high prevalence of B12 insufficiency in populations consuming low amounts of animal-source foods, which can be detected with ≥1 serum biomarker but presents the new challenge of identifying functional consequences that may require public health interventions.
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Affiliation(s)
- Lindsay H Allen
- USDA, Agricultural Research Service Western Human Nutrition Research Center, University of California, Davis, CA
| | - Joshua W Miller
- Department of Nutritional Sciences, Rutgers University, New Brunswick, NJ
| | - Lisette de Groot
- Division of Human Nutrition, Wageningen University, Wageningen, Netherlands
| | - Irwin H Rosenberg
- Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA
| | - A David Smith
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
| | - Helga Refsum
- Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - Daniel J Raiten
- Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), NIH, Bethesda, MD
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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] [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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Hashemi M, Mokhtari M, Yazdani-Shahrbabaki V, Danesh H, Bizhani F, Taheri M. Evaluation of transcobalamin II rs1801198 and transcobalamin II receptor rs2336573 gene polymorphisms in recurrent spontaneous abortion. J OBSTET GYNAECOL 2018. [DOI: 10.1080/01443615.2017.1420045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Mohammad Hashemi
- Cellular and Molecular Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
- Department of Clinical Biochemistry, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Mojgan Mokhtari
- Department of Obstetrics and Gynecology, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Vajiheh Yazdani-Shahrbabaki
- Department of Obstetrics and Gynecology, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Hiva Danesh
- Department of Clinical Biochemistry, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Fatemeh Bizhani
- Department of Clinical Biochemistry, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Mohsen Taheri
- Genetics of Non-communicable Disease Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
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Surendran S, Adaikalakoteswari A, Saravanan P, Shatwaan IA, Lovegrove JA, Vimaleswaran KS. An update on vitamin B12-related gene polymorphisms and B12 status. GENES AND NUTRITION 2018; 13:2. [PMID: 29445423 PMCID: PMC5801754 DOI: 10.1186/s12263-018-0591-9] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 01/23/2018] [Indexed: 12/12/2022]
Abstract
Background Vitamin B12 is an essential micronutrient in humans needed for health maintenance. Deficiency of vitamin B12 has been linked to dietary, environmental and genetic factors. Evidence for the genetic basis of vitamin B12 status is poorly understood. However, advancements in genomic techniques have increased the knowledge-base of the genetics of vitamin B12 status. Based on the candidate gene and genome-wide association (GWA) studies, associations between genetic loci in several genes involved in vitamin B12 metabolism have been identified. Objective The objective of this literature review was to identify and discuss reports of associations between single-nucleotide polymorphisms (SNPs) in vitamin B12 pathway genes and their influence on the circulating levels of vitamin B12. Methods Relevant articles were obtained through a literature search on PubMed through to May 2017. An article was included if it examined an association of a SNP with serum or plasma vitamin B12 concentration. Beta coefficients and odds ratios were used to describe the strength of an association, and a P < 0.05 was considered as statistically significant. Two reviewers independently evaluated the eligibility for the inclusion criteria and extracted the data. Results From 23 studies which fulfilled the selection criteria, 16 studies identified SNPs that showed statistically significant associations with vitamin B12 concentrations. Fifty-nine vitamin B12-related gene polymorphisms associated with vitamin B12 status were identified in total, from the following populations: African American, Brazilian, Canadian, Chinese, Danish, English, European ancestry, Icelandic, Indian, Italian, Latino, Northern Irish, Portuguese and residents of the USA. Conclusion Overall, the data analyzed suggests that ethnic-specific associations are involved in the genetic determination of vitamin B12 concentrations. However, despite recent success in genetic studies, the majority of identified genes that could explain variation in vitamin B12 concentrations were from Caucasian populations. Further research utilizing larger sample sizes of non-Caucasian populations is necessary in order to better understand these ethnic-specific associations.
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Affiliation(s)
- S Surendran
- 1Hugh Sinclair Unit of Human Nutrition, Department of Food and Nutritional Sciences and Institute for Cardiovascular and Metabolic Research (ICMR), University of Reading, PO Box 226, Whiteknights, Reading, RG6 6AP UK
| | - A Adaikalakoteswari
- 2Warwick Medical School - Population Evidence and Technologies, University of Warwick, Coventry, CV4 7AL UK.,3UK Academic Department of Diabetes and Metabolism, George Eliot Hospital, Nuneaton, UK
| | - P Saravanan
- 2Warwick Medical School - Population Evidence and Technologies, University of Warwick, Coventry, CV4 7AL UK.,3UK Academic Department of Diabetes and Metabolism, George Eliot Hospital, Nuneaton, UK
| | - I A Shatwaan
- 1Hugh Sinclair Unit of Human Nutrition, Department of Food and Nutritional Sciences and Institute for Cardiovascular and Metabolic Research (ICMR), University of Reading, PO Box 226, Whiteknights, Reading, RG6 6AP UK
| | - J A Lovegrove
- 1Hugh Sinclair Unit of Human Nutrition, Department of Food and Nutritional Sciences and Institute for Cardiovascular and Metabolic Research (ICMR), University of Reading, PO Box 226, Whiteknights, Reading, RG6 6AP UK
| | - K S Vimaleswaran
- 1Hugh Sinclair Unit of Human Nutrition, Department of Food and Nutritional Sciences and Institute for Cardiovascular and Metabolic Research (ICMR), University of Reading, PO Box 226, Whiteknights, Reading, RG6 6AP UK
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11
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Oussalah A, Levy J, Filhine-Trésarrieu P, Namour F, Guéant JL. Association of TCN2 rs1801198 c.776G>C polymorphism with markers of one-carbon metabolism and related diseases: a systematic review and meta-analysis of genetic association studies. Am J Clin Nutr 2017; 106:1142-1156. [PMID: 28814397 PMCID: PMC5611783 DOI: 10.3945/ajcn.117.156349] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Accepted: 07/12/2017] [Indexed: 12/29/2022] Open
Abstract
Background: Vitamin B-12 (cobalamin) deficiency may produce severe neurologic and hematologic manifestations. Approximately 20-25% of circulating cobalamin binds to transcobalamin 2 (TCN2), which is referred to as active vitamin B-12. The G allele of the TCN2 c.776G>C (rs1801198) polymorphism has been associated with a lower plasma concentration of holotranscobalamin. However, genotype association studies on rs1801198 have led to conflicting results regarding its influence on one-carbon metabolism (OCM) markers or its association with pathologic conditions.Objective: We assessed the association of rs1801198 genotypes with OCM marker concentrations and primary risks of congenital abnormalities, cancer, and Alzheimer disease.Design: We conducted a systematic review of the literature that was published from January 1966 to February 2017 and included all studies that assessed the association between rs1801198 and OCM markers or a pathologic condition.Results: Thirty-four studies met the inclusion criteria. Subjects with the rs1801198 GG genotype had significantly lower concentrations of holotranscobalamin [standardized mean difference (SMD): -0.445 (95% CI: -0.673, -0.217; P < 0.001); I2 = 48.16% (95% CI: 0.00%, 78.10%; P = 0.07)] and higher concentrations of homocysteine (European descent only) [SMD: 0.070 (95% CI: 0.020, 0.120; P = 0.01); I2 = 0.00% (95% CI: 0.00%, 49.59%; P = 0.73)] than did subjects with the rs1801198 CC genotype. The meta-analysis on the association between rs1801198 and methylmalonic acid (MMA) lacked statistical power. No significant difference was observed regarding cobalamin, folate, and red blood cell folate. No significant association was observed between rs1801198 and primary risks of congenital abnormalities, cancer, or Alzheimer disease.Conclusions: Meta-analysis results indicate an influence of rs1801198 on holotranscobalamin and homocysteine concentrations in European-descent subjects. In addition, well-designed and -powered studies should be conducted for assessing the association between rs1801198 and MMA and clinical manifestations that are linked to a decreased availability of cobalamin. This review was registered at www.crd.york.ac.uk/prospero as CRD42017058504.
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Affiliation(s)
- Abderrahim Oussalah
- Department of Molecular Medicine and Personalized Therapeutics,,Department of Biochemistry, Molecular Biology, Nutrition, and Metabolism, and,INSERM, Unité 954, Nutrition, Genetics, and Environmental Risk Exposure, Faculty of Medicine of Nancy, University of Lorraine, Vandoeuvre-lès-Nancy, France
| | - Julien Levy
- Department of Molecular Medicine and Personalized Therapeutics,,Department of Biochemistry, Molecular Biology, Nutrition, and Metabolism, and
| | - Pierre Filhine-Trésarrieu
- Department of Molecular Medicine and Personalized Therapeutics,,Department of Biochemistry, Molecular Biology, Nutrition, and Metabolism, and,INSERM, Unité 954, Nutrition, Genetics, and Environmental Risk Exposure, Faculty of Medicine of Nancy, University of Lorraine, Vandoeuvre-lès-Nancy, France
| | - Fares Namour
- Department of Molecular Medicine and Personalized Therapeutics,,Department of Biochemistry, Molecular Biology, Nutrition, and Metabolism, and,INSERM, Unité 954, Nutrition, Genetics, and Environmental Risk Exposure, Faculty of Medicine of Nancy, University of Lorraine, Vandoeuvre-lès-Nancy, France
| | - Jean-Louis Guéant
- Department of Molecular Medicine and Personalized Therapeutics, .,Department of Biochemistry, Molecular Biology, Nutrition, and Metabolism, and.,INSERM, Unité 954, Nutrition, Genetics, and Environmental Risk Exposure, Faculty of Medicine of Nancy, University of Lorraine, Vandoeuvre-lès-Nancy, France
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12
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Green R, Allen LH, Bjørke-Monsen AL, Brito A, Guéant JL, Miller JW, Molloy AM, Nexo E, Stabler S, Toh BH, Ueland PM, Yajnik C. Vitamin B 12 deficiency. Nat Rev Dis Primers 2017; 3:17040. [PMID: 28660890 DOI: 10.1038/nrdp.2017.40] [Citation(s) in RCA: 449] [Impact Index Per Article: 64.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Vitamin B12 (B12; also known as cobalamin) is a B vitamin that has an important role in cellular metabolism, especially in DNA synthesis, methylation and mitochondrial metabolism. Clinical B12 deficiency with classic haematological and neurological manifestations is relatively uncommon. However, subclinical deficiency affects between 2.5% and 26% of the general population depending on the definition used, although the clinical relevance is unclear. B12 deficiency can affect individuals at all ages, but most particularly elderly individuals. Infants, children, adolescents and women of reproductive age are also at high risk of deficiency in populations where dietary intake of B12-containing animal-derived foods is restricted. Deficiency is caused by either inadequate intake, inadequate bioavailability or malabsorption. Disruption of B12 transport in the blood, or impaired cellular uptake or metabolism causes an intracellular deficiency. Diagnostic biomarkers for B12 status include decreased levels of circulating total B12 and transcobalamin-bound B12, and abnormally increased levels of homocysteine and methylmalonic acid. However, the exact cut-offs to classify clinical and subclinical deficiency remain debated. Management depends on B12 supplementation, either via high-dose oral routes or via parenteral administration. This Primer describes the current knowledge surrounding B12 deficiency, and highlights improvements in diagnostic methods as well as shifting concepts about the prevalence, causes and manifestations of B12 deficiency.
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Affiliation(s)
- Ralph Green
- Department of Pathology and Laboratory Medicine, University of California Davis, 4400 V Street, PATH Building, Davis, California 95817, USA
| | - Lindsay H Allen
- USDA, ARS Western Human Nutrition Research Center, University of California Davis, Davis, California, USA
| | | | - Alex Brito
- USDA, ARS Western Human Nutrition Research Center, University of California Davis, Davis, California, USA
| | - Jean-Louis Guéant
- Inserm UMRS 954 N-GERE (Nutrition Génétique et Exposition aux Risques Environnementaux), University of Lorraine and INSERM, Nancy, France
| | - Joshua W Miller
- School of Environmental and Biological Sciences, Rutgers University, New Brunswick, New Jersey, USA
| | - Anne M Molloy
- School of Medicine and School of Biochemistry and Immunology, Trinity College Dublin, University of Dublin, Dublin, Ireland
| | - Ebba Nexo
- Department of Clinical Medicine, Clinical Biochemistry, Aarhus University Hospital, Aarhus, Denmark
| | - Sally Stabler
- Department of Medicine, University of Colorado Denver, Denver, Colorado, USA
| | - Ban-Hock Toh
- Centre for Inflammatory Diseases, Monash Institute of Medical Research, Clayton, Victoria, Australia
| | - Per Magne Ueland
- Laboratory of Clinical Biochemistry, Haukeland University Hospital, Bergen, Norway.,Section for Pharmacology, Department of Clinical Science, University of Bergen, Bergen, Norway
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13
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Sawaengsri H, Bergethon PR, Qiu WQ, Scott TM, Jacques PF, Selhub J, Paul L. Transcobalamin 776C→G polymorphism is associated with peripheral neuropathy in elderly individuals with high folate intake. Am J Clin Nutr 2016; 104:1665-1670. [PMID: 27733392 PMCID: PMC5118734 DOI: 10.3945/ajcn.116.139030] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 09/08/2016] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND The 776C→G polymorphism of the vitamin B-12 transport protein transcobalamin gene (TCN2) (rs1801198; Pro259Arg) is associated with a lower holotranscobalamin concentration in plasma. This effect may reduce the availability of vitamin B-12 to tissues even when vitamin B-12 intake is adequate. Clinical outcomes associated with vitamin B-12 insufficiency could potentially be worsened by high folate intake. OBJECTIVE We determined the association of the TCN2 776C→G polymorphism and folate intake with peripheral neuropathy in elders with normal plasma concentrations of vitamin B-12. DESIGN Participants in this cross-sectional study (n = 171) were from a cohort of community-based, home-bound elderly individuals aged ≥60 y who underwent an evaluation by physicians including an assessment for peripheral neuropathy. Participants were administered food-frequency and general health status questionnaires, anthropometric measurements were taken, and a fasting blood sample from each subject was collected. RESULTS Odds of neuropathy were 3-fold higher for GG genotypes than for CC genotypes (OR: 3.33; 95% CI: 1.15, 9.64). When folate intake was >2 times the Recommended Dietary Allowance (800 μg), GG genotypes had 6.9-fold higher odds of neuropathy than CC genotypes (OR: 6.9; 95% CI: 1.31, 36.36). There was no difference between the genotypes in the odds of peripheral neuropathy when folate intake was ≤800 μg (OR: 1.5; 95% CI: 0.18, 12.33). CONCLUSION The TCN2 776C→G polymorphism is associated with increased odds of peripheral neuropathy in the elderly, even with a normal vitamin B-12 status, especially if their folate intake is >2 times the Recommended Dietary Allowance.
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Affiliation(s)
- Hathairat Sawaengsri
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA
| | - Peter R Bergethon
- Neuroscience and Pain Research Unit, Pfizer Inc., Cambridge, MA; and
| | - Wei Qiao Qiu
- Boston University School of Medicine, Boston, MA
| | - Tammy M Scott
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA
| | - Paul F Jacques
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA
| | - Jacob Selhub
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA
| | - Ligi Paul
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA;
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14
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Goffinet L, Oussalah A, Guéant-Rodriguez RM, Chery C, Basha M, Avogbe PH, Josse T, Jeannesson E, Rouyer P, Flayac J, Gerard P, Le Touze A, Bonin-Goga B, Goga D, Simon E, Feillet F, Vikkula M, Guéant JL. Cystathionine β-synthase genetic variant rs2124459 is associated with a reduced risk of cleft palate in French and Belgian populations. J Med Genet 2016; 53:828-834. [DOI: 10.1136/jmedgenet-2016-104111] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Revised: 07/16/2016] [Accepted: 07/20/2016] [Indexed: 12/27/2022]
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15
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Kong D, Maity A, Hsu FC, Tzeng JY. Testing and estimation in marker-set association study using semiparametric quantile regression kernel machine. Biometrics 2015; 72:364-71. [PMID: 26575303 DOI: 10.1111/biom.12438] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 08/01/2015] [Accepted: 09/01/2015] [Indexed: 01/17/2023]
Abstract
We consider quantile regression for partially linear models where an outcome of interest is related to covariates and a marker set (e.g., gene or pathway). The covariate effects are modeled parametrically and the marker set effect of multiple loci is modeled using kernel machine. We propose an efficient algorithm to solve the corresponding optimization problem for estimating the effects of covariates and also introduce a powerful test for detecting the overall effect of the marker set. Our test is motivated by traditional score test, and borrows the idea of permutation test. Our estimation and testing procedures are evaluated numerically and applied to assess genetic association of change in fasting homocysteine level using the Vitamin Intervention for Stroke Prevention Trial data.
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Affiliation(s)
- Dehan Kong
- Department of Biostatistics, University of North Carolina, Chapel Hill, North Carolina 27599, U.S.A
| | - Arnab Maity
- Department of Statistics, North Carolina State University, Raleigh, North Carolina 27695, U.S.A
| | - Fang-Chi Hsu
- Department of Biostatistical Sciences, Wake Forest University, Winston-Salem, NC 27157, U.S.A
| | - Jung-Ying Tzeng
- Department of Statistics and Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina 27695, U.S.A.,Department of Statistics, National Cheng-Kung University, Taiwan
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16
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Cascalheira JF, Gonçalves M, Barroso M, Castro R, Palmeira M, Serpa A, Dias-Cabral AC, Domingues FC, Almeida S. Association of the transcobalamin II gene 776C→G polymorphism with Alzheimer’s type dementia: dependence on the 5, 10-methylenetetrahydrofolate reductase 1298A→C polymorphism genotype. Ann Clin Biochem 2014; 52:448-55. [DOI: 10.1177/0004563214561770] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/06/2014] [Indexed: 01/08/2023]
Abstract
Background Decreased serum concentrations of vitamin B12 are associated with Alzheimer’s type dementia. The transcobalamin II gene (TCN2) 776C→G polymorphism affects transcobalamin II function as a carrier of vitamin B12 and might modify its availability. The association of the TCN2 776C→G polymorphism with Alzheimer’s type dementia is unclear and was investigated in the present study. Methods Case–control study including 27 individuals diagnosed with Alzheimer’s type dementia and 28 healthy controls. Serum concentrations of vitamin B12, homocysteine and other analytes were determined and the presence of TCN2 776C→G and 5, 10-methylenetetrahydrofolate reductase 1298A→C polymorphisms genotypes was ascertained by polymerase chain reaction–restriction fragment length polymorphism. Results Serum concentrations of vitamin B12 were lower while those of homocysteine were higher in patients than in controls ( P < 0.05). The frequency of individuals carrying at least one 5, 10-methylenetetrahydrofolate reductase 1298C allele was higher (59% versus 32%) while frequency of individuals harbouring at least one TCN2 776G allele was lower (58% versus 86%) in patients than in controls ( P < 0.05). Univariate logistic regression showed negative association of TCN2 776CG genotype with Alzheimer’s type dementia (OR = 0.17 versus CC genotype, P < 0.02). Multivariate logistic regression identified TCN2 776C→G polymorphism as independent predictor of Alzheimer’s type dementia together with higher concentrations of homocysteine, cholesterol and uric acid and lower concentrations of oestradiol. Association of TCN2 776C→G polymorphism with Alzheimer’s type dementia was observed for individuals carrying the 5,10-methylenetetrahydrofolate reductase 1298AA genotype but not the AC or CC genotypes, indicating interaction between the two polymorphisms. Conclusions The TCN2 776C→G polymorphism is negatively associated with Alzheimer’s type dementia, suggesting a protective role against the disease in subjects with the 5, 10-methylenetetrahydrofolate reductase 1298AA genotype.
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Affiliation(s)
- José F Cascalheira
- CICS-UBI – Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal
| | - Mónica Gonçalves
- CICS-UBI – Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal
| | - Madalena Barroso
- Research Institute for Medicines (iMed.UL), Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
| | - Rita Castro
- Research Institute for Medicines (iMed.UL), Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
- Department of Biochemistry and Human Biology, Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
| | | | - André Serpa
- CICS-UBI – Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal
| | - Ana C Dias-Cabral
- CICS-UBI – Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal
| | - Fernanda C Domingues
- CICS-UBI – Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal
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17
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Huang T, Sun J, Chen Y, Xie H, Xu D, Li D. Associations of common variants in methionine metabolism pathway genes with plasma homocysteine and the risk of type 2 diabetes in Han Chinese. JOURNAL OF NUTRIGENETICS AND NUTRIGENOMICS 2014; 7:63-74. [PMID: 25074646 DOI: 10.1159/000365007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Accepted: 05/28/2014] [Indexed: 11/19/2022]
Abstract
BACKGROUND/AIMS An association of genetic variants of homocysteine (Hcy) metabolic genes with type 2 diabetes mellitus (T2DM) has been reported. The objective of the present study was to investigate the relationship between the genetic variants in Hcy metabolism-related genes and plasma Hcy levels and T2DM susceptibility in Han Chinese. METHODS A total of 774 patients with T2DM and 500 healthy individuals were recruited. Single-nucleotide polymorphism was determined by standard methods. RESULTS The Hcy-increasing allele score was positively associated with plasma Hcy levels in both T2DM patients and healthy subjects (r = 0.171 and 0.247, respectively). Subjects with the genotype CC of MTHFR (rs1801131) had a significantly higher likelihood of T2DM compared with subjects with the AA or AA+AC genotypes (OR = 1.93 for CC vs. AA, p = 0.041; OR = 3.13 for CC vs. AA+AC, p = 0.017, respectively). Subjects with the genotype AA of the MTHFD variant (rs2236225) had a significantly lower likelihood of T2DM compared with subjects with the GG or GG+GA genotypes (OR = 0.36 for AA vs. GG, p = 0.027; OR = 0.36 for AA vs. GG+GA, p = 0.017, respectively). In addition, the genotype CT+TT of the PEMT (rs4646356) variants displayed a significant association with an increased risk of T2DM (OR = 1.52 for CT+TT vs. CC, p = 0.042). CONCLUSIONS MTHFR rs1801131 C allele and PEMT rs4646356 T allele were associated with a high risk of T2DM in these Han Chinese.
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Affiliation(s)
- Tao Huang
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Md., USA
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18
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Trakadis YJ, Alfares A, Bodamer OA, Buyukavci M, Christodoulou J, Connor P, Glamuzina E, Gonzalez-Fernandez F, Bibi H, Echenne B, Manoli I, Mitchell J, Nordwall M, Prasad C, Scaglia F, Schiff M, Schrewe B, Touati G, Tchan MC, Varet B, Venditti CP, Zafeiriou D, Rupar CA, Rosenblatt DS, Watkins D, Braverman N. Update on transcobalamin deficiency: clinical presentation, treatment and outcome. J Inherit Metab Dis 2014; 37:461-73. [PMID: 24305960 DOI: 10.1007/s10545-013-9664-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Revised: 11/13/2013] [Accepted: 11/14/2013] [Indexed: 10/25/2022]
Abstract
Transcobalamin (TC) transports cobalamin from blood into cells. TC deficiency is a rare autosomal recessive disorder usually presenting in early infancy with failure to thrive, weakness, diarrhoea, pallor, anemia, and pancytopenia or agammaglobulinemia. It can sometimes resemble neonatal leukemia or severe combined immunodeficiency disease. Diagnosis of TC deficiency is suspected based on megaloblastic anemia, elevation of total plasma homocysteine, and blood or urine methylmalonic acid. It is confirmed by studying the synthesis of TC in cultured fibroblasts, or by molecular analysis of the TCN2 gene. TC deficiency is treatable with supplemental cobalamin, but the optimal type, route and frequency of cobalamin administration and long term patient outcomes are unknown. Here we present a series of 30 patients with TC deficiency, including an update on multiple previously published patients, in order to evaluate the different treatment strategies and provide information about long term outcome. Based on the data presented, current practice appears to favour treatment of individuals with TC deficiency by intramuscular injections of hydroxy- or cyanocobalamin. In most cases presented, at least weekly injections (1 mg IM) were necessary to ensure optimal treatment. Most centres adjusted the treatment regimen based on monitoring CBC, total plasma homocysteine, plasma and urine methylmalonic acid, as well as, clinical status. Finally, continuing IM treatment into adulthood appears to be beneficial.
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Affiliation(s)
- Y J Trakadis
- Department of Medical Genetics, McGill University Health Centre, Montreal, QC, Canada,
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19
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Kim HS, Lee BE, Jeon YJ, Rah H, Lee WS, Shin JE, Choi DH, Kim NK. Transcobalamin II (TCN267A>G andTCN2776C>G) and Transcobalamin II Receptor (TCblR1104C>T) Polymorphisms in Korean Patients with Idiopathic Recurrent Spontaneous Abortion. Am J Reprod Immunol 2014; 72:337-46. [DOI: 10.1111/aji.12256] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 03/18/2014] [Indexed: 11/28/2022] Open
Affiliation(s)
- Hyun Seok Kim
- Institute for Clinical Research; CHA Bundang Medical Center; CHA University; Seongnam South Korea
| | - Bo Eun Lee
- Institute for Clinical Research; CHA Bundang Medical Center; CHA University; Seongnam South Korea
- Department of Biomedical Science; College of Life Science; CHA University; Seongnam South Korea
| | - Young Joo Jeon
- Institute for Clinical Research; CHA Bundang Medical Center; CHA University; Seongnam South Korea
- Department of Biomedical Science; College of Life Science; CHA University; Seongnam South Korea
| | - HyungChul Rah
- Institute for Clinical Research; CHA Bundang Medical Center; CHA University; Seongnam South Korea
| | - Woo Sik Lee
- Fertility Center of CHA Gangnam Medical Center; CHA University; Seoul South Korea
| | - Ji Eun Shin
- Department of Obstetrics and Gynecology; CHA Bundang Medical Center; CHA University; Seongnam South Korea
| | - Dong Hee Choi
- Department of Obstetrics and Gynecology; CHA Bundang Medical Center; CHA University; Seongnam South Korea
| | - Nam Keun Kim
- Institute for Clinical Research; CHA Bundang Medical Center; CHA University; Seongnam South Korea
- Department of Biomedical Science; College of Life Science; CHA University; Seongnam South Korea
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20
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McCaddon A. Vitamin B12 in neurology and ageing; clinical and genetic aspects. Biochimie 2012; 95:1066-76. [PMID: 23228515 DOI: 10.1016/j.biochi.2012.11.017] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Accepted: 11/27/2012] [Indexed: 01/13/2023]
Abstract
The classic neurological and psychiatric features associated with vitamin B12 deficiency have been well described and are the subject of many excellent review articles. The advent of sensitive diagnostic tests, including homocysteine and methylmalonic acid assays, has revealed a surprisingly high prevalence of a more subtle 'subclinical' form of B12 deficiency, particularly within the elderly. This is often associated with cognitive impairment and dementia, including Alzheimer's disease. Metabolic evidence of B12 deficiency is also reported in association with other neurodegenerative disorders including vascular dementia, Parkinson's disease and multiple sclerosis. These conditions are all associated with chronic neuro-inflammation and oxidative stress. It is possible that these clinical associations reflect compromised vitamin B12 metabolism due to such stress. Physicians are also increasingly aware of considerable inter-individual variation in the clinical response to B12 replacement therapy. Further research is needed to determine to what extent this is attributable to genetic determinants of vitamin B12 absorption, distribution and cellular uptake.
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Affiliation(s)
- Andrew McCaddon
- School of Medicine, Cardiff University, Gwenfro Units 6/7, Wrexham Technology Park, Wrexham LL17 7YP, Wales, United Kingdom.
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21
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Vitamin B-12 status during pregnancy and child's IQ at age 8: a Mendelian randomization study in the Avon longitudinal study of parents and children. PLoS One 2012; 7:e51084. [PMID: 23227234 PMCID: PMC3515553 DOI: 10.1371/journal.pone.0051084] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Accepted: 11/01/2012] [Indexed: 11/19/2022] Open
Abstract
Vitamin B-12 is essential for the development and maintenance of a healthy nervous system. Brain development occurs primarily in utero and early infancy, but the role of maternal vitamin B-12 status during pregnancy on offspring cognitive function is unclear. In this study we assessed the effect of vitamin B-12 status in well-nourished pregnant women on the cognitive ability of their offspring in a UK birth cohort (ALSPAC). We then examined the association of SNPs in maternal genes FUT2 (rs492602) and TCN2 (rs1801198, rs9606756) that are related to plasma vitamin B-12, with offspring IQ. Observationally, there was a positive association between maternal vitamin B-12 intake and child’s IQ that was markedly attenuated after adjustment for potential confounders (mean difference in offspring IQ score per doubling of maternal B-12 intake, before adjustment: 2.0 (95% CI 1.3, 2.8); after adjustment: 0.7 (95% CI −0.04, 1.4)). Maternal FUT2 was weakly associated with offspring IQ: mean difference in IQ per allele was 0.9 (95% CI 0.1, 1.6). The expected effect of maternal vitamin B-12 on offspring IQ, given the relationships between SNPs and vitamin B-12, and SNPs and IQ was consistent with the observational result. Our findings suggest that maternal vitamin B-12 may not have an important effect on offspring cognitive ability. However, further examination of this issue is warranted.
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Biselli JM, Zampieri BL, Goloni-Bertollo EM, Haddad R, Fonseca MFR, Eberlin MN, Vannucchi H, Carvalho VM, Pavarino EC. Genetic polymorphisms modulate the folate metabolism of Brazilian individuals with Down syndrome. Mol Biol Rep 2012; 39:9277-84. [PMID: 22903356 DOI: 10.1007/s11033-012-1629-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Accepted: 04/16/2012] [Indexed: 12/01/2022]
Abstract
Individuals with Down syndrome (DS) carry three copies of the Cystathionine β-synthase (CβS) gene. The increase in the dosage of this gene results in an altered profile of metabolites involved in the folate pathway, including reduced homocysteine (Hcy), methionine, S-adenosylhomocysteine (SAH) and S-adenosylmethionine (SAM). Furthermore, previous studies in individuals with DS have shown that genetic variants in genes involved in the folate pathway influence the concentrations of this metabolism's products. The purpose of this study is to investigate whether polymorphisms in genes involved in folate metabolism affect the plasma concentrations of Hcy and methylmalonic acid (MMA) along with the concentration of serum folate in individuals with DS. Twelve genetic polymorphisms were investigated in 90 individuals with DS (median age 1.29 years, range 0.07-30.35 years; 49 male and 41 female). Genotyping for the polymorphisms was performed either by polymerase chain reaction (PCR) based techniques or by direct sequencing. Plasma concentrations of Hcy and MMA were measured by liquid chromatography-tandem mass spectrometry as previously described, and serum folate was quantified using a competitive immunoassay. Our results indicate that the MTHFR C677T, MTR A2756G, TC2 C776G and BHMT G742A polymorphisms along with MMA concentration are predictors of Hcy concentration. They also show that age and Hcy concentration are predictors of MMA concentration. These findings could help to understand how genetic variation impacts folate metabolism and what metabolic consequences these variants have in individuals with trisomy 21.
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Affiliation(s)
- J M Biselli
- Departamento de Biologia Molecular, Faculdade de Medicina de São José do Rio Preto (FAMERP), Unidade de Pesquisa em Genética e Biologia Molecular (UPGEM), Av. Brigadeiro Faria Lima, n.o 5416-Bloco U-6, São José do Rio Preto, SP, CEP: 15.090-000, Brazil
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Smach MA, Naffeti S, Charfeddine B, Ben Abdallah J, Othmen LB, Letaef A, Limem K. [Homocysteine, vitamin B-12, folic acid and the cognitive decline in the elderly]. ACTA ACUST UNITED AC 2012; 61:184-92. [PMID: 22647793 DOI: 10.1016/j.patbio.2012.04.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Accepted: 04/18/2012] [Indexed: 11/25/2022]
Abstract
Hyperhomocysteinemia is a risk factor for neurological diseases, but the underlying pathophysiology has not been adequately explained. Mild hyperhomocysteinemia, which is sometimes associated with a low plasma level of vitamin B9, B12 and folic acid, is responsible in the toxicity in neural cell by activating NMDA receptor. Indeed, even if vitamin supplementation has clearly proven its efficiency on lowering plasma levels of homocysteine, recent studies do not show any positive effect of vitamin therapy on cognitive function. The hypothesis that this therapy is inefficient has been recently reinforced by two randomized trials on the effects of vitamin supplementation. Several hypotheses still need to be explored: Mechanisms of homocysteine toxicity and that of total uselessness of vitamin supplementation; the possible need to complete the actual data with further, more powerful studies in order to prove the role of homocysteine in the development of neurodegenerative diseases and a clinical effect of vitamin therapy.
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Affiliation(s)
- M A Smach
- Department of Biochemistry, Faculty of Medicine of Sousse, 4002 Sousse, Tunisie.
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Hsu FC, Sides EG, Mychaleckyj JC, Worrall BB, Elias GA, Liu Y, Chen WM, Coull BM, Toole JF, Rich SS, Furie KL, Sale MM. Transcobalamin 2 variant associated with poststroke homocysteine modifies recurrent stroke risk. Neurology 2011; 77:1543-50. [PMID: 21975197 DOI: 10.1212/wnl.0b013e318233b1f9] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
OBJECTIVES The Vitamin Intervention for Stroke Prevention trial found an association between baseline poststroke homocysteine (Hcy) and recurrent stroke. We investigated genes for enzymes and cofactors in the Hcy metabolic pathway for association with Hcy and determined whether associated single nucleotide polymorphisms (SNPs) influenced recurrent stroke risk. METHODS Eighty-six SNPs in 9 candidate genes (BHMT1, BHMT2, CBS, CTH, MTHFR, MTR, MTRR, TCN1, and TCN2) were genotyped in 2,206 subjects (83% European American). Associations with Hcy measures were assessed using linear regression models assuming an additive genetic model, adjusting for age, sex, and race and additionally for baseline Hcy when postmethionine load change was assessed. Associations with recurrent stroke were evaluated using survival analyses. RESULTS Five SNPs in the transcobalamin 2 (TCN2) gene were associated with baseline Hcy (false discovery rate [FDR]-adjusted p = 0.049). TCN2 SNP rs731991 was associated with recurrent stroke risk in the low-dose arm of the trial under a recessive model (log-rank test p = 0.009, hazard ratio 0.34). Associations with change in postmethionine load Hcy levels were found with 5 SNPs in the cystathionine β-synthase (CBS) gene (FDR-adjusted p < 0.031). CONCLUSIONS TCN2 variants contribute to poststroke Hcy levels, whereas variants in the CBS gene influence Hcy metabolism. Variation in the TCN2 gene also affects recurrent stroke risk in response to cofactor therapy.
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Affiliation(s)
- F-C Hsu
- Department of Biostatistical Sciences, Wake Forest University School of Medicine, Winston-Salem, NC, USA
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Godbole K, Gayathri P, Ghule S, Sasirekha BV, Kanitkar-Damle A, Memane N, Suresh S, Sheth J, Chandak GR, Yajnik CS. Maternal one-carbon metabolism, MTHFR and TCN2 genotypes and neural tube defects in India. ACTA ACUST UNITED AC 2011; 91:848-56. [PMID: 21770021 DOI: 10.1002/bdra.20841] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Revised: 04/28/2011] [Accepted: 05/07/2011] [Indexed: 01/15/2023]
Abstract
BACKGROUND Neural tube defects (NTDs) are among the most common severe congenital malformations, representing a long-term public health burden in India. A deranged one-carbon metabolism and genes regulating this metabolism have been linked to NTDs. Vitamin B(12) deficiency is reported to be more prevalent than folate deficiency in the Indian population. We investigated the role of maternal nutritional and genetic markers related to one-carbon metabolism in the etiology of NTDs. METHODS We conducted a multicenter case-control study to compare plasma folate, vitamin B(12) , homocysteine and holo-transcobalamin levels, and polymorphisms in methylenetetrahydrofolate reductase (MTHFR, 677C>T, 1298A>C, 1781G>A and 236+724A>G) and transcobalamin (TCN2, 776C>G) genes, in 318 women with NTD-affected offspring (cases) and 702 women with apparently healthy offspring (controls). The samples were collected at diagnosis in cases and at delivery in controls. RESULTS We observed a significant association of high maternal plasma homocysteine concentrations with NTDs in the offspring (p = 0.026). There was no association of maternal folate or B(12) levels with NTDs (p > 0.05) but low maternal holo-transcobalamin predicted strong risk of NTDs in the offspring (p = 0.003). The commonly associated maternal polymorphism 677C>T in the MTHFR gene did not predict risk of NTDs in the offspring (p > 0.05) and 1298A>C and 1781G>A polymorphisms in MTHFR were protective (p = 0.024 and 0.0004 respectively). Maternal 776C>G polymorphism in TCN2 was strongly predictive of NTD in the offspring (p = 0.006). CONCLUSION Our study has demonstrated a possible role for maternal B(12) deficiency in the etiology of NTDs in India over and above the well-established role of folate deficiency.
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Affiliation(s)
- Koumudi Godbole
- Diabetes Unit, KEM Hospital Research Center, Rasta Peth, Pune, India
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Carmel R. Biomarkers of cobalamin (vitamin B-12) status in the epidemiologic setting: a critical overview of context, applications, and performance characteristics of cobalamin, methylmalonic acid, and holotranscobalamin II. Am J Clin Nutr 2011; 94:348S-358S. [PMID: 21593511 PMCID: PMC3174853 DOI: 10.3945/ajcn.111.013441] [Citation(s) in RCA: 162] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Cobalamin deficiency is relatively common, but the great majority of cases in epidemiologic surveys have subclinical cobalamin deficiency (SCCD), not classical clinical deficiency. Because SCCD has no known clinical expression, its diagnosis depends solely on biochemical biomarkers, whose optimal application becomes crucial yet remains unsettled. This review critically examines the current diagnostic concepts, tools, and interpretations. Their exploration begins with understanding that SCCD differs from clinical deficiency not just in degree of deficiency but in fundamental pathophysiology, causes, likelihood and rate of progression, and known health risks (the causation of which by SCCD awaits proof by randomized clinical trials). Conclusions from SCCD data, therefore, often may not apply to clinical deficiency and vice versa. Although many investigators view cobalamin testing as unreliable, cobalamin, like all diagnostic biomarkers, performs satisfactorily in clinical deficiency but less well in SCCD. The lack of a diagnostic gold standard limits the ability to weigh the performance characteristics of metabolic biomarkers such as methylmalonic acid (MMA) and holotranscobalamin II, whose specificities remain incompletely defined outside their relations to each other. Variable cutoff selections affect diagnostic conclusions heavily and need to be much better rationalized. The maximization of reliability and specificity of diagnosis is far more important today than the identification of ever-earlier stages of SCCD. The limitations of all current biomarkers make the combination of ≥2 test result abnormalities, such as cobalamin and MMA, the most reliable approach to diagnosing deficiency in the research setting; reliance on one test alone courts frequent misdiagnosis. Much work remains to be done.
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Affiliation(s)
- Ralph Carmel
- Department of Medicine, New York Methodist Hospital, Brooklyn, NY 11215, USA.
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Folate-metabolizing gene variants and pregnancy outcome of IVF. Reprod Biomed Online 2011; 22:603-14. [DOI: 10.1016/j.rbmo.2011.03.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2010] [Revised: 02/23/2011] [Accepted: 03/01/2011] [Indexed: 11/18/2022]
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The transcobalamin (TCN2) 776C>G polymorphism affects homocysteine concentrations among subjects with low vitamin B12 status. Eur J Clin Nutr 2010; 64:1338-43. [DOI: 10.1038/ejcn.2010.157] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Is a low blood level of vitamin B12 a cardiovascular and diabetes risk factor? A systematic review of cohort studies. Eur J Nutr 2010; 50:97-106. [PMID: 20585951 DOI: 10.1007/s00394-010-0119-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2010] [Accepted: 06/11/2010] [Indexed: 12/11/2022]
Abstract
PURPOSE To assess the prior hypothesis that low blood vitamin B12, partly through hyperhomocysteinemia and partly through direct effects, increases the risk of cardiovascular diseases and diabetes. As background, we also extracted all-cause mortality from the studies that met our criteria. METHODS A systematic review of prospective cohort studies identified through searching six electronic databases, screening of reference lists, and citation search. Included studies reported data on the association between vitamin B12 blood levels, or other appropriate surrogate biological markers e.g. holotranscobalamin or serum/urine methylmalonic acid, and fatal or non-fatal incident diabetes and cardiovascular events. RESULTS Seven studies were included. Studies differed regarding the population studied, length of follow-up, study outcomes, and data analysis--a narrative synthesis approach was performed to examine the results. Most studies met few of the quality assessment criteria which were adapted from the Scottish Intercollegiate Guidelines Network (SIGN). Only one high-quality study reported that low B12 increased the risk of incident cerebral ischaemia (RR = 1.76; 95% CI = 1.16-2.68). After controlling for homocysteine, the association persisted although weakened (RR = 1.57; 95% CI = 1.02-2.43), suggesting that the effects of low B12 were only partly mediated by homocysteine. In two studies, higher B12 levels were associated with a greater risk of total mortality (RR = 1.00; 95% CI = 1.00-1.00 and HR = 1.15; 95% CI = 1.08-1.22, respectively) and combined fatal and non-fatal coronary events (RR = 1.00; 95% CI = 1.00-1.00). No association between study outcomes and vitamin B12 levels was found in four other studies. CONCLUSIONS Surprisingly, there is only very limited evidence that vitamin B12 deficiency predisposes to the risk of mortality and morbidity from either cardiovascular diseases or diabetes in adults. Current data do not support vitamin B12 supplementation to reduce the risk of cardiovascular diseases or diabetes.
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The TCN2 776C>G polymorphism correlates with vitamin B12 cellular delivery in healthy adult populations. Clin Biochem 2010; 43:645-9. [DOI: 10.1016/j.clinbiochem.2010.01.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2009] [Revised: 01/26/2010] [Accepted: 01/27/2010] [Indexed: 12/17/2022]
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Zintzaras E. Genetic variants of homocysteine/folate metabolism pathway and risk of inflammatory bowel disease: a synopsis and meta-analysis of genetic association studies. Biomarkers 2010; 15:69-79. [PMID: 20085490 DOI: 10.3109/13547500903297184] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A synopsis and meta-analysis of studies that investigated the association between genetic variants involved in the homocysteine/folate metabolism pathway and risk of inflammatory bowel disease (IBD) were conducted. Four variants (MTHFR C6TTT, MTHFR A1298C, MTR A2756G and MTRR A66G) showed significant associations in individual studies. In meta-analyses, only the variant MTR A2756G indicated an association with the risk of IBD for the allele contrast and the dominant model (odds ratio (OR) 1.48 (1.12-1.97) and OR 1.55 (1.12-2.15), respectively). The effect sizes for Crohn's disease and ulcerative colitis were similar to IBD. Cumulative meta-analysis for C677T indicated a downward trend of association as information accumulates.
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Affiliation(s)
- Elias Zintzaras
- Department of Biomathematics, University of Thessaly School of Medicine, Larissa, Greece.
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Transcobalamin C776G genotype modifies the association between vitamin B12 and homocysteine in older Hispanics. Eur J Clin Nutr 2010; 64:503-9. [PMID: 20216556 PMCID: PMC2864787 DOI: 10.1038/ejcn.2010.20] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Background A common polymorphism, C776G, in the plasma B12 transport protein transcobalamin (TC), encodes for either proline or arginine at codon 259. This polymorphism may affect the affinity of TC for B12 and subsequent delivery of B12 to tissues. Methods TC genotype and its associations with indicators of B12 status, including total B12, holotranscobalamin (holoTC), methylmalonic acid, and homocysteine, were evaluated in a cohort of elderly Latinos (N=554, age 60–93y) from the Sacramento Area Latino Study on Aging (SALSA). Results The distribution of TC genotypes was 41.3% homozygous reference (776CC) and 11.6% homozygous variant (776GG). No differences between the homozygous genotypes were observed in total B12, holoTC, methylmalonic acid, or homocysteine. The holoTC/total B12 ratio was lower in the 776GG group compared with the 776CC group (p=0.04). Significant interactions of TC genotype with total B12 (p=0.04) and with holoTC (p≤0.03) were observed such that mean homocysteine concentrations and the odds ratios for hyperhomocysteinemia (>13 µmol/L) were higher in the 776CC subjects compared with all carriers of the G allele (776CG and 776GG combined) when total B12 (<156 pmol/L) or holoTC (<35 pmol/L) were low. Conclusions This population of older Latinos has a lower prevalence of the TC 776GG variant than reported for Caucasian populations. The association between vitamin B12 and homocysteine concentrations is modified by TC 776 genotype. It remains to be determined if the TC C776G polymorphism has a significant effect on the hematological and neurological manifestations of B12 deficiency or on vascular and other morbidities associated with hyperhomocysteinemia.
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Matteini AM, Walston JD, Bandeen-Roche K, Arking DE, Allen RH, Fried LP, Chakravarti A, Stabler SP, Fallin MD. Transcobalamin-II variants, decreased vitamin B12 availability and increased risk of frailty. J Nutr Health Aging 2010; 14:73-7. [PMID: 20082058 PMCID: PMC3042247 DOI: 10.1007/s12603-010-0013-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
OBJECTIVE This project was designed to follow-up prior evidence that demonstrated a significant association between vitamin B12 transport and metabolism and the frailty syndrome in community-dwelling older women. The cross-sectional relationship between genetic variants within six candidate genes along this pathway with serum methylmalonic acid (MMA) levels and frailty was evaluated in this same population of older women. METHODS Baseline measures were collected prior to folate fortification from 326 women in the Women's Health and Aging Studies I and II. Odds ratios and statistical tests were estimated for single SNP and haplotype via linear regression models for serum MMA, a marker for available vitamin B12, and in logistic regression models for frailty. RESULTS Fifty-six SNPs from CBS, MTHFR, MTR, MTRR, TCN1 and TCN2 genes were genotyped. Several SNPs in MTHFR, MTR and MTRR demonstrated a modest association to elevated MMA, while SNPs in TCN2 showed significant association to the frailty syndrome. TCN2 polymorphisms, particularly one SNP reported to be in perfect LD with functional variant Pro259Arg, were significantly associated with increased odds of frailty, after adjustment for age, presence of cardiovascular disease and elevated MMA (OR = 2.25, p-value = 0.009). CONCLUSIONS Using MMA as a marker for vitamin B12, these results suggest that TCN2 gene variants may lead to decreased vitamin B12 availability, leading to reduced energy metabolism, ultimately contributing to frailty pathology. Further studies to determine the biological role of functional TCN2 polymorphisms in frailty are needed.
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Affiliation(s)
- A M Matteini
- Johns Hopkins University, Baltimore, MD 21205, USA.
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Anchoring secreted proteins in endoplasmic reticulum by plant oleosin: the example of vitamin B12 cellular sequestration by transcobalamin. PLoS One 2009; 4:e6325. [PMID: 19623264 PMCID: PMC2710007 DOI: 10.1371/journal.pone.0006325] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2009] [Accepted: 06/08/2009] [Indexed: 12/03/2022] Open
Abstract
Background Oleosin is a plant protein localized to lipid droplets and endoplasmic reticulum of plant cells. Our idea was to use it to target functional secretory proteins of interest to the cytosolic side of the endoplasmic reticulum of mammalian cells, through expressing oleosin-containing chimeras. We have designed this approach to create cellular models deficient in vitamin B12 (cobalamin) because of the known problematics associated to the obtainment of effective vitamin B12 deficient cell models. This was achieved by the overexpression of transcobalamin inside cells through anchoring to oleosin. Methodology chimera gene constructs including transcobalamin-oleosin (TC-O), green fluorescent protein-transcobalamin-oleosin (GFP-TC-O) and oleosin-transcobalamin (O-TC) were inserted into pAcSG2 and pCDNA3 vectors for expression in sf9 insect cells, Caco2 (colon carcinoma), NIE-115 (mouse neuroblastoma), HEK (human embryonic kidney), COS-7 (Green Monkey SV40-transfected kidney fibroblasts) and CHO (Chinese hamster ovary cells). The subcellular localization, the changes in vitamin B12 binding activity and the metabolic consequences were investigated in both Caco2 and NIE-115 cells. Principal findings vitamin B12 binding was dramatically higher in TC-O than that in O-TC and wild type (WT). The expression of GFP-TC-O was observed in all cell lines and found to be co-localized with an ER-targeted red fluorescent protein and calreticulin of the endoplasmic reticulum in Caco2 and COS-7 cells. The overexpression of TC-O led to B12 deficiency, evidenced by impaired conversion of cyano-cobalamin to ado-cobalamin and methyl-cobalamin, decreased methionine synthase activity and reduced S-adenosyl methionine to S-adenosyl homocysteine ratio, as well as increases in homocysteine and methylmalonic acid concentration. Conclusions/Significance the heterologous expression of TC-O in mammalian cells can be used as an effective strategy for investigating the cellular consequences of vitamin B12 deficiency. More generally, expression of oleosin-anchored proteins could be an interesting tool in cell engineering for studying proteins of pharmacological interest.
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Böttiger AK, Nilsson TK. Pyrosequencing assay for genotyping of the Transcobalamin II 776C>G polymorphism. Scandinavian Journal of Clinical and Laboratory Investigation 2009; 67:247-51. [PMID: 17366004 DOI: 10.1080/00365510601026542] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The 776C>G polymorphism of the Transcobalamin II gene is located in a GC-rich region and TaqMan real-time polymerase chain reaction (PCR) does not yield satisfactory genotyping results. We therefore hypothesized that a method based on DNA sequencing would be needed for this single nucleotide polymorphism (SNP) analysis; Pyrosequencing technology was tested for this purpose. A Pyrosequencing protocol was developed, optimized and applied to a sample of 389 Swedish senior citizens. The three genotypes CC, CG, and GG consistently yielded typical programs that were readily distinguishable from each other. The prevalence of the mutated allele in the studied Swedish population was q=0.445. It is concluded that the TC II 776C>G polymorphism can be reliably genotyped by Pyrosequencing technology.
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Affiliation(s)
- A K Böttiger
- Department of Clinical Chemistry, Orebro University Hospital, Orebro, Sweden.
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Meyer K, Fredriksen A, Ueland PM. MALDI-TOF MS genotyping of polymorphisms related to 1-carbon metabolism using common and mass-modified terminators. Clin Chem 2008; 55:139-49. [PMID: 18988749 DOI: 10.1373/clinchem.2008.115378] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Large cohort studies may provide sufficient power to disentangle the role of polymorphisms related to 1-carbon metabolism and chronic diseases, but they require fast, accurate, high-throughput genotyping techniques. MALDI-TOF mass spectrometry has been adapted to rapid fine mapping using various approaches for allele discrimination. We developed a genotyping method based on MALDI-TOF MS and compared assay performance for formats based on standard and mass-modified terminators. METHODS The assay includes 20 polymorphisms of 14 genes involved in 1-carbon metabolism (BHMT 742G>A, CBS 844ins68 and 699C>T, CTH 1364G>T, DHFR del19, NOS3 -786T>C and 894G>T, FOLR1 1314G>A, MTHFD1 -105T>C and 1958G>A, MTHFR 677C>T and 1298A>C, MTR 2756A>G, MTRR 66A>G and 524C>T, SLC19A1 80G>A, SHMT1 1420C>T, TCN2 67A>G and 776C>G, and TYMS 1494del6). RESULTS Missing calls were observed for 4.7% of the DNA samples, attributed to failed liquid sample handling. Highly accurate genotyping was obtained by mass-modified as well as standard ddNTPs, with an average error rate of < or =0.1% by analysis of sample duplicates. A semiquantitative approach enabled unambiguous identification of the CBS 844ins68. Cluster plots of the relative allele intensities showed allele-specific bias according to type of minisequencing terminator and revealed a potential structural variation in the BHMT gene. CONCLUSIONS MALDI-TOF MS-based genotyping using either standard or mass-modified terminators allows the accurate determination of single nucleotides as well as structural genetic variants. This was demonstrated with 20 polymorphisms involved in 1-carbon metabolism.
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Affiliation(s)
- Klaus Meyer
- Bevital A/S, Armauer Hansens Hus, University of Bergen, Bergen, Norway.
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Forges T, Pellanda H, Diligent C, Monnier P, Guéant JL. Les folates : quel impact sur la fertilité ? ACTA ACUST UNITED AC 2008; 36:930-9. [DOI: 10.1016/j.gyobfe.2008.07.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2008] [Accepted: 07/06/2008] [Indexed: 12/16/2022]
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Chen M, Peyrin-Biroulet L, Xia B, Guéant-Rodriguez RM, Bronowicki JP, Bigard MA, Guéant JL. Methionine synthase A2756G polymorphism may predict ulcerative colitis and methylenetetrahydrofolate reductase C677T pancolitis, in Central China. BMC MEDICAL GENETICS 2008; 9:78. [PMID: 18700049 PMCID: PMC2533647 DOI: 10.1186/1471-2350-9-78] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/24/2007] [Accepted: 08/13/2008] [Indexed: 01/06/2023]
Abstract
Background The association of genetic polymorphisms related to metabolism of homocysteine with inflammatory bowel disease has been evidenced in Crohn disease and remains an open question in ulcerative colitis. We evaluated the association of the polymorphisms of MTHFR, MTR, MTRR and TCN2 genes with ulcerative colitis in Central China. Methods 168 patients were genotyped for these polymorphisms and compared to 219 matched controls. Results Methionine synthase 2756G allele frequency was higher in ulcerative colitis than in controls 0.15 (95% C.I. 0.11–0.19) vs 0.09 (95% C.I. 0.07 – 0.12), (P = 0.0137) and predicted ulcerative colitis risk in logistic regression, with an Odds ratio at 1.8 (95% C.I. 1.15–2.84). Methylenetetrahydrofolate reductase 677TT genotype was 2.7-fold more prevalent in individuals with pancolitis than in those with left colitis or proctitis, with respective percentages of 27.3 (95% C.I.16.4–42.0) and 10.5 (95% C.I. 6.3–17.1) (P = 0.0123). The carriage of 677TT or 677CT/1298AC genotypes of methylenetetrahydrofolate reductase was more frequent in cases with pancolitis than in subjects with left colitis or proctitis (P = 0.0048), with an Odds ratio adjusted by age and sex at 3.3 (95% C.I. 1.4–7.9), P = 0.0084) in logistic regression. Conclusion Methionine synthase and methylenetetrahydrofolate reductase are genes of vitamin B12 and folate cellular metabolism associated respectively with risk and extent of ulcerative colitis, at least in Central China. This finding may open new insights, particularly for the potential interest in treating patients carrying the 677TT MTHFR genetic trait and a deficit in folate.
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Affiliation(s)
- Min Chen
- Inserm, U724, Laboratory of Cellular and Molecular Pathology in Nutrition, Faculty of Medicine, Nancy-Université, Nancy- Vandoeuvre, France.
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Abstract
This review describes current knowledge of the main causes of vitamin B12 and folate deficiency. The most common explanations for poor vitamin B12 status are a low dietary intake of the vitamin (i.e., a low intake of animal-source foods) and malabsorption. Although it has long been known that strict vegetarians (vegans) are at risk for vitamin B12 deficiency, evidence now indicates that low intakes of animal-source foods, such as occur in some lacto-ovo vegetarians and many less-industrialized countries, cause vitamin B12 depletion. Malabsorption of the vitamin is most commonly observed as food-bound cobalamin malabsorption due to gastric atrophy in the elderly, and probably as a result of Helicobacter pylori infection. There is growing evidence that gene polymorphisms in transcobalamins affect plasma vitamin B12 concentrations. The primary cause of folate deficiency is low intake of sources rich in the vitamin, such as legumes and green leafy vegetables, and the consumption of these foods may explain why folate status can be adequate in relatively poor populations. Other situations in which the risk of folate deficiency increases include lactation and alcoholism.
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Candito M, Rivet R, Herbeth B, Boisson C, Rudigoz RC, Luton D, Journel H, Oury JF, Roux F, Saura R, Vernhet I, Gaucherand P, Muller F, Guidicelli B, Heckenroth H, Poulain P, Blayau M, Francannet C, Roszyk L, Brustié C, Staccini P, Gérard P, Fillion-Emery N, Guéant-Rodriguez RM, Van Obberghen E, Guéant JL. Nutritional and genetic determinants of vitamin B and homocysteine metabolisms in neural tube defects: a multicenter case-control study. Am J Med Genet A 2008; 146A:1128-33. [PMID: 18386810 DOI: 10.1002/ajmg.a.32199] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Neural tube defects (NTDs) are severe congenital malformations due to failure of neural tube formation in early pregnancy. The proof that folic acid prevents NTDs raises the question of whether other parts of homocysteine (Hcy) metabolism may affect rates of NTDs. This French case-control study covered: 77 women aged 17-42 years sampled prior to elective abortion for a severe NTDs (cases) and 61 women aged 20-43 years with a normal pregnancy. Plasma and erythrocyte folate, plasma B6, B12 and Hcy were tested as five polymorphisms MTHFR 677 C --> T, MTHFR 1298 A --> C, MTR 2756 A --> G, MTTR 66 A --> G and TCN2 776 C --> G. Cases had significantly lower erythrocyte folate, plasma folate, B12 and B6 concentrations than the controls, and higher Hcy concentration. The odds ratio was 2.15 (95% CI: 1.00-4.59) for women with the MTRR 66 A --> G allele and it was decreased for mothers carrying the MTHFR 1298 A --> C allele. In multivariate analysis, only the erythrocyte folate concentration (P = 0.005) and plasma B6 concentration (P = 0.020) were predictors. Red cell folate is the main determinant of NTDs in France. Folic acid supplement or flour fortification would prevent most cases. Increased consumption of vitamins B12 and B6 could contribute to the prevention of NTDs. Genetic polymorphisms played only a small role. Until folic acid fortification becomes mandatory, all women of reproductive age should consume folic acid in a multivitamin that also contains B12 and B6.
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Affiliation(s)
- Mirande Candito
- Inserm U-145, Department of Biochemistry, CHU Nice Hôpital Pasteur, Nice, France.
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Matteini AM, Walston JD, Fallin MD, Bandeen-Roche K, Kao WHL, Semba RD, Allen RH, Guralnik J, Fried LP, Stabler SP. Markers of B-vitamin deficiency and frailty in older women. J Nutr Health Aging 2008; 12:303-8. [PMID: 18443711 PMCID: PMC2739594 DOI: 10.1007/bf02982659] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To evaluate the association between markers of vitamins B12, B6 and folate deficiency and the geriatric syndrome of frailty. DESIGN Cross-sectional study of baseline measures from the combined Women's Health and Aging Studies. SETTING Baltimore, Maryland. PARTICIPANTS Seven hundred three community-dwelling women, aged 70-79. MEASUREMENTS Frailty was defined by five-component screening criteria that include weight, grip strength, endurance, physical activity and walking speed measurements and modeled as binary and 3-level polytomous outcomes. Independent variables serum vitamin B6, vitamin B12, methylmalonic acid, total homocysteine, cystathionine and folate were modeled continuously and as abnormal versus normal. RESULTS Serum biomarker levels varied significantly by race. All analyses were race-stratified and results are reported only for Caucasian women due to small African American sample size. In polytomous logistic regression models of 3-level frailty, Caucasian women with increasing MMA, defined either continuously or using a predefined threshold, had 40-60% greater odds of being prefrail (p-values < 0.07) and 1.66-2.33 times greater odds of being frail (p-values < 0.02) compared to nonfrails after adjustment for age, education, low serum carotenoids, alcohol intake, cardiovascular disease and renal impairment. Both binary and polytomous frailty models evaluating vitamin B12 as the main exposure estimated odds ratios that were similar in trend yet slightly less significant than the MMA results. CONCLUSIONS These results suggest that vitamin B12 deficiency may contribute to the frailty syndrome in community-dwelling older women. Future studies are needed to explore these relationships longitudinally.
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Verkleij-Hagoort AC, van Driel LMJW, Lindemans J, Isaacs A, Steegers EAP, Helbing WA, Uitterlinden AG, Steegers-Theunissen RPM. Genetic and lifestyle factors related to the periconception vitamin B12 status and congenital heart defects: a Dutch case-control study. Mol Genet Metab 2008; 94:112-9. [PMID: 18226574 DOI: 10.1016/j.ymgme.2007.12.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2007] [Revised: 12/04/2007] [Accepted: 12/04/2007] [Indexed: 01/29/2023]
Abstract
Maternal hyperhomocysteinemia is associated with congenital heart defects (CHDs) in the offspring. A low periconception vitamin B12 status is determined by genetic and lifestyle factors and causes hyperhomocysteinemia. We investigated methionine synthase reductase (MTRR) and transcobalamin II (TC) genes and maternal intake and serum concentrations of vitamin B12 in association with CHD risk. Seventeen months after the index-pregnancy, we studied 230 children with a CHD and 251 non-malformed children and their parents. Data were collected on current and periconception maternal vitamin supplement use and maternal dietary vitamin B12 intake of the month before the study moment. Blood samples were taken for the determination of MTRR A66G and TC C776G genotypes in families and maternal serum vitamin B12 concentrations. Transmission disequilibrium tests and univariate and multivariate analyses were applied. Allele transmissions were not significantly distorted. The MTRR and TC genotypes did not significantly affect CHD risk. Neither polymorphisms in mothers and/or children revealed significant interactions nor in combination with low vitamin B12 intake. Low maternal serum vitamin B12 combined with the maternal or child's MTRR 66 GG genotype resulted in odds ratios of 1.4 (95% confidence interval 0.6-3.5) and 1.3 (0.5-3.4), respectively. The TC 776 GG genotype in mothers and children revealed risk estimates of 2.2 (0.7-7.1) and 1.9 (0.5-7.4), respectively. In conclusion, MTRR 66 GG and TC 776 GG genotypes in mothers and children may contribute to the risk of CHDs, particularly when the maternal vitamin B12 status is low. The future enlargement of our sample size might demonstrate significant associations.
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Affiliation(s)
- Anna C Verkleij-Hagoort
- Department of Obstetrics, Division of Obstetrics and Prenatal Medicine, Erasmus MC, University Medical Center, Dr. Molewaterplein 40, 3015 GD Rotterdam, The Netherlands
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Peyrin-Biroulet L, Guéant-Rodriguez RM, Chen M, Bronowicki JP, Bigard MA, Guéant JL. Association of MTRR 66A>G polymorphism with superoxide dismutase and disease activity in patients with Crohn's disease. Am J Gastroenterol 2008; 103:399-406. [PMID: 17925002 DOI: 10.1111/j.1572-0241.2007.01573.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVES The aim of this study was to evaluate the association of nutritional (folate, vitamin B12) and genetic (MTHFR, MTR, MTRR, TCN) determinants of homocysteine metabolism and of superoxide dismutase with Crohn's disease (CD). METHODS One hundred forty patients with CD were compared with 248 matched healthy controls. RESULTS Plasma homocysteine levels were higher in CD patients than controls (11.8 vs 10.4 micromol/L, P= 0.0004). Vitamin B12 and folate levels were lower in CD subjects compared to controls (207 vs 255 pmol/L, P= 0.0082, and 8.6 vs 11 nmol/L, P= 0036, respectively). Patients with a personal history of ileal resection, ileitis, or colectomy had significantly lower vitamin B12 levels. In multivariate analysis, vitamin B12 and MTHFR 677 TT carriers were the two significant independent factors of plasma homocysteine >15 micromol/L in CD patients (P= 0.0187 and 0.0048, respectively). The significant association between homocysteine and vitamin B12 levels remained significant only in patients with the highest superoxide dismutase values (P < 0.0001). The MTRR AA genotype was a significant independent predictor of CD risk (odds ratio 3.7, 95% CI 1.218-11.649, P= 0.0213). The level of superoxide dismutase was significantly higher (P= 0.0143) and was correlated with Crohn's Disease Activity Index (CDAI) scores (P for trend = 0.0276) in patients carrying MTRR AA genotype. CONCLUSIONS Vitamin B12 and MTHFR 677 TT genotype are the main determinants of hyperhomocysteinemia in CD patients. The association of MTRR 66A>G polymorphism with oxidant stress and disease activity provides rationale for screening vitamin deficiencies in these patients.
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Affiliation(s)
- Laurent Peyrin-Biroulet
- Inserm, U724, Laboratory of Cellular and Molecular Pathology in Nutrition, Faculty of Medicine, Vandoeuvre-les-Nancy, France
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Fredriksen A, Meyer K, Ueland PM, Vollset SE, Grotmol T, Schneede J. Large-scale population-based metabolic phenotyping of thirteen genetic polymorphisms related to one-carbon metabolism. Hum Mutat 2007; 28:856-65. [PMID: 17436311 DOI: 10.1002/humu.20522] [Citation(s) in RCA: 131] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Several polymorphisms of genes involved in one-carbon metabolism have been identified. The reported metabolic phenotypes are often based on small studies providing inconsistent results. This large-scale study of 10,601 population-based samples was carried out to investigate the association between a panel of biochemical parameters and genetics variants related to one-carbon metabolism. Concentrations of total homocysteine (tHcy), folate, vitamin B(12) (cobalamin), methylmalonic acid (MMA), vitamin B(2) (riboflavin), vitamin B(6) (PLP), choline, betaine, dimethylglycine (DMG), cystathionine, cysteine, methionine, and creatinine were determined in serum/plasma. All subjects were genotyped for 13 common polymorphisms: methylenetetrahydrofolate reductase (MTHFR) c.665C>T (known as 677C>T; p.Ala222Val) and c.1286A>C (known as 1298A>C; p.Glu429Ala); methionine synthase (MTR) c.2756A>G (p.Asp919Gly); methionine synthase reductase (MTRR) c.66A>G (p.Ile22Met); methylenetetrahydrofolate dehydrogenase (MTHFD1) c.1958G>A (p.Arg653Gln); betaine homocysteine methyltransferase (BHMT) c.716G>A (known as 742G>A; p.Arg239Gln); cystathionine beta-synthase (CBS) c.844_845ins68 and c.699C>T (p.Tyr233Tyr); transcobalamin-II (TCN2) c.67A>G (p.Ile23Val) and c.776C>G (p.Pro259Arg); reduced folate carrier-1 (SLC19A1) c.80G>A (p.Arg27His); and paraoxonase-1 (PON1) c.163T>A (p.Leu55Met) and c.575A>G (p.Gln192Arg). The metabolic profile in terms of the measured vitamins and metabolites were investigated for these 13 polymorphisms. We confirmed the strong associations of MTHFR c.665C>T with tHcy and folate, but also observed significant (P<0.01) changes in metabolite concentrations according to other gene polymorphisms. These include MTHFR c.1286A>C (associations with tHcy, folate and betaine), MTR c.2756A>G (tHcy), BHMT c.716G>A (DMG), CBS c.844_845ins68 (tHcy, betaine), CBS c.699C>T (tHcy, betaine, cystathionine) and TCN2 c.776C>G (MMA). No associations were observed for the other polymorphisms investigated.
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Affiliation(s)
- Ase Fredriksen
- LOCUS for Homocysteine and Related Vitamins, University of Bergen, Bergen, Norway.
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Solomon LR. Disorders of cobalamin (Vitamin B12) metabolism: Emerging concepts in pathophysiology, diagnosis and treatment. Blood Rev 2007; 21:113-30. [DOI: 10.1016/j.blre.2006.05.001] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Peyrin-Biroulet L, Rodriguez-Guéant RM, Chamaillard M, Desreumaux P, Xia B, Bronowicki JP, Bigard MA, Guéant JL. Vascular and cellular stress in inflammatory bowel disease: revisiting the role of homocysteine. Am J Gastroenterol 2007; 102:1108-15. [PMID: 17355415 DOI: 10.1111/j.1572-0241.2007.01170.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Moderate hyperhomocysteinemia is a complex trait commonly associated with inflammatory bowel disease (IBD). Nutritional deficiencies and genetic determinants have been identified as risk factors for moderate hyperhomocysteinemia, such as folate and vitamin B(12) deprivation and polymorphisms in the 5,10 methylenetetrahydrofolate reductase (MTHFR) encoding gene, respectively. Homocysteine has a crucial role in cellular stress, epigenetic events, inflammatory processes, and host-microbial interactions. Hyperhomocysteinemia might therefore influence the clinical history of IBD, including disease severity, susceptibility to particular enteric infections, and the risk for the development of colorectal cancer. In contrast, homocysteine metabolism does not seem to contribute to the greater risk of thrombosis in IBD subjects. Herein, we review the evidence linking homocysteine metabolism to the pathophysiology of IBD. Furthermore, we discuss the relevance of screening and treating folate and vitamin B(12) deficiencies in IBD subjects. Given the peculiar frequency of such deficiencies in IBD, normalizing vitamin levels should be an integral part of the management of these patients, especially those with active disease, history of intestinal resection, and/or treated with methotrexate.
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Affiliation(s)
- Laurent Peyrin-Biroulet
- Inserm, U724, Laboratory of Cellular and Molecular Pathology in Nutrition, Faculty of Medicine, Nancy-Universitè Vandoeuvre-les-Nancy, F-54511, France
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Forges T, Monnier-Barbarino P, Alberto JM, Guéant-Rodriguez RM, Daval JL, Guéant JL. Impact of folate and homocysteine metabolism on human reproductive health. Hum Reprod Update 2007; 13:225-38. [PMID: 17307774 DOI: 10.1093/humupd/dml063] [Citation(s) in RCA: 169] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Folates belong to the vitamin B group and are involved in a large number of biochemical processes, particularly in the metabolism of homocysteine. Dietary or genetically determined folate deficiency leads to mild hyperhomocysteinemia, which has been associated with various pathologies. Molecular mechanisms of homocysteine-induced cellular dysfunction include increased inflammatory cytokine expression, altered nitric oxide bioavailability, induction of oxidative stress, activation of apoptosis and defective methylation. Whereas the involvement of folate metabolism and homocysteine in ageing-related diseases, in several developmental abnormalities and in pregnancy complications has given rise to a large amount of scientific work, the role of these biochemical factors in the earlier stages of mammalian reproduction and the possible preventive effects of folate supplementation on fertility have, until recently, been much less investigated. In the present article, the possible roles of folates and homocysteine in male and female subfertility and related diseases are systematically reviewed, with regard to the epidemiological, pathological, pharmacological and experimental data of the literature from the last 25 years.
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Affiliation(s)
- Thierry Forges
- Inserm U724, Laboratory of Cellular and Molecular Pathology in Nutrition, University of Nancy, Vandoeuvre les Nancy, France.
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Guéant JL, Chabi NW, Guéant-Rodriguez RM, Mutchinick OM, Debard R, Payet C, Lu X, Villaume C, Bronowicki JP, Quadros EV, Sanni A, Amouzou E, Xia B, Chen M, Anello G, Bosco P, Romano C, Arrieta HR, Sánchez BE, Romano A, Herbeth B, Anwar W, Namour F. Environmental influence on the worldwide prevalence of a 776C->G variant in the transcobalamin gene (TCN2). J Med Genet 2007; 44:363-7. [PMID: 17220211 PMCID: PMC2740879 DOI: 10.1136/jmg.2006.048041] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND A 776C-->G variant (dbSNP ID: rs1801198) in the transcobalamin gene (TCN2; MIM# 275350) decreases the cellular and plasma concentration of transcobalamin and thereby influences the cellular availability of vitamin B(12). OBJECTIVE To evaluate the worldwide prevalence of this variant and its association with homocysteine plasma level. METHODS The study was performed in 1433 apparently healthy subjects, including Afro-Americans and Afro-Africans and in 251 Afro-Africans participants with severe malaria. RESULTS The frequencies of the 776G allele were the highest in China (0.607; 95% CI 0.554 to 0.659), low in West Africa (Bénin and Togo, 0.178; 0.154 to 0.206), and intermediate in France (0.445; 0.408 to 0.481), Italy (0.352; 0.299 to 0.409), Morocco (0.370; 0.300 to 0.447) and Mexico (0.374; 0.392 to 0.419). The 776G genotype was more frequent in Afro-Americans from New York (16.7; 8.4 to 30.7) and in Afro-African patients with severe malaria (6.0%; 95% CI 3.7 to 9.6) than in healthy Afro-African volunteers (p = 0.0004 and p = 0.033, respectively), while no difference was observed for MTHFR 677TT and 677T alleles. A disequilibrium of TCN2 genotype distribution was recorded in patients with severe malaria, with a twofold higher GG genotype than expected (p = 0.010). An association between the TCN2 polymorphism and homocysteine was observed only in Mexico and France, the two countries with the highest rate of low plasma concentration of vitamin B(12) (<100 pmol/l). CONCLUSION Given the dramatic heterogeneity of the 776G allele frequency worldwide, this polymorphism may be prone to a selective pressure or confers an evolutionary advantage in confronting environmental factors, one of which is malaria.
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Affiliation(s)
- Jean-Louis Guéant
- Inserm U-724, Cellular and Molecular Pathology in Nutrition, Faculté de Médecine, University Henry Poincaré of Nancy, Vandoeuvre lès Nancy, France.
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Pereira AC, Lourenço DM, Maffei FH, Morelli VM, Rollo HA, Zago MA, Vannucchi H, Franco RF. A transcobalamin gene polymorphism and the risk of venous thrombosis. The BRATROS (Brazilian Thrombosis Study). Thromb Res 2007; 119:183-8. [PMID: 16530812 DOI: 10.1016/j.thromres.2006.01.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2005] [Revised: 12/20/2005] [Accepted: 01/23/2006] [Indexed: 11/23/2022]
Affiliation(s)
- Ana C Pereira
- School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo (USP), Brazil.
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Aléssio ACM, Höehr NF, Siqueira LH, Bydlowski SP, Annichino-Bizzacchi JM. Polymorphism C776G in the transcobalamin II gene and homocysteine, folate and vitamin B12 concentrations. Association with MTHFR C677T and A1298C and MTRR A66G polymorphisms in healthy children. Thromb Res 2006; 119:571-7. [PMID: 16820193 DOI: 10.1016/j.thromres.2006.05.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2005] [Revised: 05/10/2006] [Accepted: 05/11/2006] [Indexed: 11/21/2022]
Abstract
One of the etiologies of hyperhomocysteinemia is decreased vitamin B(12). Genetic variation in the transcobalamin II gene, the transporter of vitamin B(12) to the cells, may produce altered homocysteine levels. We determined transcobalamin II C776G polymorphism, homocysteine, folate and vitamin B(12) levels and analyzed the interactive effect with the methylenetetrahydrofolate reductase C677T and A1298C and methionine synthase reductase A66G polymorphisms in 207 healthy Brazilian children. The prevalence of GG genotype of transcobalamin II C776G polymorphism in this Brazilian population, a highly miscigeneous population was 12.5% and the statistical analysis showed that this population is in Hardy-Weinberg equilibrium, it could be considered representative of the general population. We observed a significant increase in homocysteine in the 776GG vs. 776CC genotype, corroborating the influence of age as a determinant of homocysteine in relation to this polymorphism. When we analyzed vitamin B(12) and its relationship with the C776G polymorphism, we found no significant differences. Only 776CG/66AA or 776GG/66AG genotypes presented a significant increase in homocysteine when compared with other groups. In the multivariate analysis, transcobalamin II C776G (CC/CG vs. GG), methylenetetrahydrofolate reductase C677T (CC/CT vs. TT), folate, gender and age presented statistical significance in relation to the homocysteine. These can be considered independent risk factors for hyperhomocysteinemia in this children group. Our results, if confirmed in other populations, highlight the necessity for investigation of the transcobalamin II C776G polymorphism in the research for hyperhomocysteinemia risk factors.
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Affiliation(s)
- Ana C M Aléssio
- Hematology-Hemotherapy Center, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Campinas, SP, Brazil.
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