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Aldridge CM, Braun R, Lohse K, de Havenon A, Cole JW, Cramer SC, Lindgren AG, Keene KL, Hsu FC, Worrall BB. Genome-Wide Association Studies of 3 Distinct Recovery Phenotypes in Mild Ischemic Stroke. Neurology 2024; 102:e208011. [PMID: 38181310 PMCID: PMC11023036 DOI: 10.1212/wnl.0000000000208011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 09/27/2023] [Indexed: 01/07/2024] Open
Abstract
BACKGROUND AND OBJECTIVES Stroke genetic research has made substantial progress in the past decade. Its recovery application, however, remains behind, in part due to its reliance on the modified Rankin Scale (mRS) score as a measure of poststroke outcome. The mRS does not map well to biological processes because numerous psychosocial factors drive much of what the mRS captures. Second, the mRS contains multiple disparate biological events into a single measure further limiting its use for biological discovery. This led us to investigate the effect of distinct stroke recovery phenotypes on genetic variation associations with Genome-Wide Association Studies (GWASs) by repurposing the NIH Stroke Scale (NIHSS) and its subscores. METHODS In the Vitamin Intervention for Stroke Prevention cohort, we estimated changes in cognition, motor, and global impairments over 2 years using specific measures. We included genotyped participants with a total NIHSS score greater than zero at randomization and excluded those with recurrent stroke during the trial. A GWAS linear mixed-effects model predicted score changes, with participant as a random effect, and included initial score, age, sex, treatment group, and the first 5 ancestry principal components. RESULTS In total, 1,270 participants (64% male) were included with a median NIHSS score of 2 (interquartile range [IQR] 1-3) and median age 68 (IQR 59-75) years. At randomization, 20% had cognitive deficits (NIHSS Cog-4 score >0) and 70% had ≥1 motor deficits (impairment score >1). At 2 years, these percentages improved to 7.2% with cognitive deficits and 30% with motor deficits. GWAS identified novel suggestive gene-impairment associations (p < 5e-6) for cognition (CAMK2D, EVX2, LINC0143, PTPRM, SGMS1, and SMAD2), motor (ACBD6, KDM4B, MARK4, PTPRS, ROBO1, and ROBO2), and global (MSR1 and ROBO2) impairments. DISCUSSION Defining domain-specific stroke recovery phenotypes and using longitudinal clinical trial designs can help detect novel genes associated with chronic recovery. These data support the use of granular endpoints to identify genetic associations related to stroke recovery.
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Affiliation(s)
- Chad M Aldridge
- From the Department of Neurology (C.M.A., B.B.W.), University of Virginia, Charlottesville; Department of Neurology (R.B., J.W.C.), University of Maryland, Baltimore; Program in Physical Therapy (K.L.), Washington University; Department of Neurology (K.L.), Washington University, St. Louis, MO; Department of Neurology (A.H.), Center for Brain and Mind Health, Yale University, New Haven, CT; Department of Neurology (S.C.C.), University of California Los Angeles; California Rehabilitation Institute (S.C.C.), Los Angeles; Department of Clinical Sciences Lund, Neurology (A.G.L.), Lund University; Department of Neurology (A.G.L.), Skane University Hospital, Sweden; Department of Public Health Sciences (K.L.K., B.B.W.); Center for Health Equity and Precision Public Health (K.L.K.), University of Virginia, Charlottesville; and Department of Biostatistics (F.-C.H.), School of Medicine, Wake Forest University, Winston-Salem, NC
| | - Robynne Braun
- From the Department of Neurology (C.M.A., B.B.W.), University of Virginia, Charlottesville; Department of Neurology (R.B., J.W.C.), University of Maryland, Baltimore; Program in Physical Therapy (K.L.), Washington University; Department of Neurology (K.L.), Washington University, St. Louis, MO; Department of Neurology (A.H.), Center for Brain and Mind Health, Yale University, New Haven, CT; Department of Neurology (S.C.C.), University of California Los Angeles; California Rehabilitation Institute (S.C.C.), Los Angeles; Department of Clinical Sciences Lund, Neurology (A.G.L.), Lund University; Department of Neurology (A.G.L.), Skane University Hospital, Sweden; Department of Public Health Sciences (K.L.K., B.B.W.); Center for Health Equity and Precision Public Health (K.L.K.), University of Virginia, Charlottesville; and Department of Biostatistics (F.-C.H.), School of Medicine, Wake Forest University, Winston-Salem, NC
| | - Keith Lohse
- From the Department of Neurology (C.M.A., B.B.W.), University of Virginia, Charlottesville; Department of Neurology (R.B., J.W.C.), University of Maryland, Baltimore; Program in Physical Therapy (K.L.), Washington University; Department of Neurology (K.L.), Washington University, St. Louis, MO; Department of Neurology (A.H.), Center for Brain and Mind Health, Yale University, New Haven, CT; Department of Neurology (S.C.C.), University of California Los Angeles; California Rehabilitation Institute (S.C.C.), Los Angeles; Department of Clinical Sciences Lund, Neurology (A.G.L.), Lund University; Department of Neurology (A.G.L.), Skane University Hospital, Sweden; Department of Public Health Sciences (K.L.K., B.B.W.); Center for Health Equity and Precision Public Health (K.L.K.), University of Virginia, Charlottesville; and Department of Biostatistics (F.-C.H.), School of Medicine, Wake Forest University, Winston-Salem, NC
| | - Adam de Havenon
- From the Department of Neurology (C.M.A., B.B.W.), University of Virginia, Charlottesville; Department of Neurology (R.B., J.W.C.), University of Maryland, Baltimore; Program in Physical Therapy (K.L.), Washington University; Department of Neurology (K.L.), Washington University, St. Louis, MO; Department of Neurology (A.H.), Center for Brain and Mind Health, Yale University, New Haven, CT; Department of Neurology (S.C.C.), University of California Los Angeles; California Rehabilitation Institute (S.C.C.), Los Angeles; Department of Clinical Sciences Lund, Neurology (A.G.L.), Lund University; Department of Neurology (A.G.L.), Skane University Hospital, Sweden; Department of Public Health Sciences (K.L.K., B.B.W.); Center for Health Equity and Precision Public Health (K.L.K.), University of Virginia, Charlottesville; and Department of Biostatistics (F.-C.H.), School of Medicine, Wake Forest University, Winston-Salem, NC
| | - John W Cole
- From the Department of Neurology (C.M.A., B.B.W.), University of Virginia, Charlottesville; Department of Neurology (R.B., J.W.C.), University of Maryland, Baltimore; Program in Physical Therapy (K.L.), Washington University; Department of Neurology (K.L.), Washington University, St. Louis, MO; Department of Neurology (A.H.), Center for Brain and Mind Health, Yale University, New Haven, CT; Department of Neurology (S.C.C.), University of California Los Angeles; California Rehabilitation Institute (S.C.C.), Los Angeles; Department of Clinical Sciences Lund, Neurology (A.G.L.), Lund University; Department of Neurology (A.G.L.), Skane University Hospital, Sweden; Department of Public Health Sciences (K.L.K., B.B.W.); Center for Health Equity and Precision Public Health (K.L.K.), University of Virginia, Charlottesville; and Department of Biostatistics (F.-C.H.), School of Medicine, Wake Forest University, Winston-Salem, NC
| | - Steven C Cramer
- From the Department of Neurology (C.M.A., B.B.W.), University of Virginia, Charlottesville; Department of Neurology (R.B., J.W.C.), University of Maryland, Baltimore; Program in Physical Therapy (K.L.), Washington University; Department of Neurology (K.L.), Washington University, St. Louis, MO; Department of Neurology (A.H.), Center for Brain and Mind Health, Yale University, New Haven, CT; Department of Neurology (S.C.C.), University of California Los Angeles; California Rehabilitation Institute (S.C.C.), Los Angeles; Department of Clinical Sciences Lund, Neurology (A.G.L.), Lund University; Department of Neurology (A.G.L.), Skane University Hospital, Sweden; Department of Public Health Sciences (K.L.K., B.B.W.); Center for Health Equity and Precision Public Health (K.L.K.), University of Virginia, Charlottesville; and Department of Biostatistics (F.-C.H.), School of Medicine, Wake Forest University, Winston-Salem, NC
| | - Arne G Lindgren
- From the Department of Neurology (C.M.A., B.B.W.), University of Virginia, Charlottesville; Department of Neurology (R.B., J.W.C.), University of Maryland, Baltimore; Program in Physical Therapy (K.L.), Washington University; Department of Neurology (K.L.), Washington University, St. Louis, MO; Department of Neurology (A.H.), Center for Brain and Mind Health, Yale University, New Haven, CT; Department of Neurology (S.C.C.), University of California Los Angeles; California Rehabilitation Institute (S.C.C.), Los Angeles; Department of Clinical Sciences Lund, Neurology (A.G.L.), Lund University; Department of Neurology (A.G.L.), Skane University Hospital, Sweden; Department of Public Health Sciences (K.L.K., B.B.W.); Center for Health Equity and Precision Public Health (K.L.K.), University of Virginia, Charlottesville; and Department of Biostatistics (F.-C.H.), School of Medicine, Wake Forest University, Winston-Salem, NC
| | - Keith L Keene
- From the Department of Neurology (C.M.A., B.B.W.), University of Virginia, Charlottesville; Department of Neurology (R.B., J.W.C.), University of Maryland, Baltimore; Program in Physical Therapy (K.L.), Washington University; Department of Neurology (K.L.), Washington University, St. Louis, MO; Department of Neurology (A.H.), Center for Brain and Mind Health, Yale University, New Haven, CT; Department of Neurology (S.C.C.), University of California Los Angeles; California Rehabilitation Institute (S.C.C.), Los Angeles; Department of Clinical Sciences Lund, Neurology (A.G.L.), Lund University; Department of Neurology (A.G.L.), Skane University Hospital, Sweden; Department of Public Health Sciences (K.L.K., B.B.W.); Center for Health Equity and Precision Public Health (K.L.K.), University of Virginia, Charlottesville; and Department of Biostatistics (F.-C.H.), School of Medicine, Wake Forest University, Winston-Salem, NC
| | - Fang-Chi Hsu
- From the Department of Neurology (C.M.A., B.B.W.), University of Virginia, Charlottesville; Department of Neurology (R.B., J.W.C.), University of Maryland, Baltimore; Program in Physical Therapy (K.L.), Washington University; Department of Neurology (K.L.), Washington University, St. Louis, MO; Department of Neurology (A.H.), Center for Brain and Mind Health, Yale University, New Haven, CT; Department of Neurology (S.C.C.), University of California Los Angeles; California Rehabilitation Institute (S.C.C.), Los Angeles; Department of Clinical Sciences Lund, Neurology (A.G.L.), Lund University; Department of Neurology (A.G.L.), Skane University Hospital, Sweden; Department of Public Health Sciences (K.L.K., B.B.W.); Center for Health Equity and Precision Public Health (K.L.K.), University of Virginia, Charlottesville; and Department of Biostatistics (F.-C.H.), School of Medicine, Wake Forest University, Winston-Salem, NC
| | - Bradford B Worrall
- From the Department of Neurology (C.M.A., B.B.W.), University of Virginia, Charlottesville; Department of Neurology (R.B., J.W.C.), University of Maryland, Baltimore; Program in Physical Therapy (K.L.), Washington University; Department of Neurology (K.L.), Washington University, St. Louis, MO; Department of Neurology (A.H.), Center for Brain and Mind Health, Yale University, New Haven, CT; Department of Neurology (S.C.C.), University of California Los Angeles; California Rehabilitation Institute (S.C.C.), Los Angeles; Department of Clinical Sciences Lund, Neurology (A.G.L.), Lund University; Department of Neurology (A.G.L.), Skane University Hospital, Sweden; Department of Public Health Sciences (K.L.K., B.B.W.); Center for Health Equity and Precision Public Health (K.L.K.), University of Virginia, Charlottesville; and Department of Biostatistics (F.-C.H.), School of Medicine, Wake Forest University, Winston-Salem, NC
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2
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Ghose M, Das M, Das R, Barua AR, Deka P, Barman A, Lahan V, Choudhury DJ, Sharma JP, Mathur M, Borah NC, Choudhury N, Barman A. Homocysteine, Vitamins B6, B12, and Folate and the Risk of Ischemic and Hemorrhagic Stroke: A Case-control Study from Northeast India. Ann Neurosci 2022. [DOI: 10.1177/09727531221124425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Background Stroke is a major leading global health complication. Identification and management of risk factors associated with stroke can help in prior detection, prevention, and improvement in patient care. Purpose To investigate the prevalence of hyperhomocysteinemia (HHcy) and Vitamins B6, B12, and folate deficiency in stroke patients and also to assess other risk factors associated with ischemic and hemorrhagic stroke. Methods Detail history of all the subjects in the study including history of hypertension, anemia, fasting glucose, carotid artery thickness, smoking, alcohol, and dietary intake was recorded. Standard assays for homocysteine (Hcy), Vitamins B6, B12, and folate estimation were done. Lipid and renal profile tests were also performed. The prevalence and odds of having HHcy, Vitamins B6, B12, and folate deficiency, and other risk factors in ischemic and hemorrhagic stroke patients were evaluated. Student’s t-tests and chi-square tests were done for statistical validation of the data. Results Prevalence of HHcy and Vitamins B6, B12, and folate deficiency was not observed in ischemic cases. HHcy and folate deficiency was found to be prevalent in hemorrhagic stroke patients. The odds that a person with HHcy and folate deficiency has hemorrhagic stroke was found to be significantly high. Conclusion In our study, high Hcy and low folate levels emerged as risk factors for hemorrhagic stroke.
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Affiliation(s)
- Manash Ghose
- Department of Neurology, GNRC Hospitals, Dispur, Guwahati, Assam, India
| | - Madhumita Das
- Department of Biochemistry, GNRC Medical, North Guwahati, Assam, India
| | - Rupjyoti Das
- Department of Neurology, GNRC Hospitals, Dispur, Guwahati, Assam, India
| | | | - Prasenjit Deka
- Department of Neurology, GNRC Hospitals, Six Mile, Guwahati, Assam, India
| | - Aparajita Barman
- Department of Neurology, GNRC Hospitals, Dispur, Guwahati, Assam, India
| | - Vivekananda Lahan
- Department of Neurology, GNRC Hospitals, Six Mile, Guwahati, Assam, India
| | | | | | - Manik Mathur
- Department of Neurology, GNRC Hospitals, Dispur, Guwahati, Assam, India
| | | | - Nupur Choudhury
- Department of Research and Analytics, GNRC Hospitals, Dispur, Assam, India
| | - Ananya Barman
- Department of Research and Analytics, GNRC Hospitals, Dispur, Assam, India
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3
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Leira Y, Mascarenhas P, Blanco J, Sobrino T, Mendes JJ, Machado V, Botelho J. Network Protein Interaction in the Link between Stroke and Periodontitis Interplay: A Pilot Bioinformatic Analysis. Genes (Basel) 2021; 12:genes12050787. [PMID: 34065604 PMCID: PMC8160956 DOI: 10.3390/genes12050787] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/10/2021] [Accepted: 05/19/2021] [Indexed: 12/11/2022] Open
Abstract
The clinical interaction between stroke and periodontitis has been consistently studied and confirmed. Hence, exploring potentially new protein interactions in this association using bioinformatic strategies presents potential interest. In this exploratory study, we conducted a protein-protein network interaction (PPI) search with documented encoded proteins for both stroke and periodontitis. Genes of interest were collected via GWAS database. The STRING database was used to predict the PPI networks, first in a sensitivity purpose (confidence cut-off of 0.7), and then with a highest confidence cut-off (0.9). Genes over-representation was inspected in the final network. As a result, we foresee a prospective protein network of interaction between stroke and periodontitis. Inflammation, pro-coagulant/pro-thrombotic state and, ultimately, atheroma plaque rupture is the main biological mechanism derived from the network. These pilot results may pave the way to future molecular and therapeutic studies to further comprehend the mechanisms between these two conditions.
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Affiliation(s)
- Yago Leira
- Periodontology Unit, Faculty of Odontology and Medicine, Medical-Surgical Research Group, Health Research Institute of Santiago de Compostela, University of Santiago de Compostela, 15706 Santiago de Compostela, Spain; (Y.L.); (J.B.)
- Clinical Neurosciences Research Laboratory, Health Research Institute of Santiago de Compostela, University Clinical Hospital, 15706 Santiago de Compostela, Spain;
- Periodontology Unit, UCL Eastman Dental Institute & NIHR UCLH Biomedical Research Centre, University College London, London WC1E 6BT, UK
| | - Paulo Mascarenhas
- Center for Medical Genetics and Pediatric Nutrition Egas Moniz, Instituto Universitário Egas Moniz (IUEM), 2829-511 Caparica, Portugal;
- Evidence-Based Hub, Clinical Research Unit (CRU), Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Egas Moniz—Cooperativa de Ensino Superior, CRL, 2829-511 Caparica, Portugal; (J.J.M.); (V.M.)
| | - Juan Blanco
- Periodontology Unit, Faculty of Odontology and Medicine, Medical-Surgical Research Group, Health Research Institute of Santiago de Compostela, University of Santiago de Compostela, 15706 Santiago de Compostela, Spain; (Y.L.); (J.B.)
| | - Tomás Sobrino
- Clinical Neurosciences Research Laboratory, Health Research Institute of Santiago de Compostela, University Clinical Hospital, 15706 Santiago de Compostela, Spain;
| | - José João Mendes
- Evidence-Based Hub, Clinical Research Unit (CRU), Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Egas Moniz—Cooperativa de Ensino Superior, CRL, 2829-511 Caparica, Portugal; (J.J.M.); (V.M.)
| | - Vanessa Machado
- Evidence-Based Hub, Clinical Research Unit (CRU), Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Egas Moniz—Cooperativa de Ensino Superior, CRL, 2829-511 Caparica, Portugal; (J.J.M.); (V.M.)
- Periodontology Department, Clinical Research Unit (CRU), Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Egas Moniz—Cooperata de Ensino Superior, CRL, 2829-511 Caparica, Portugal
| | - João Botelho
- Evidence-Based Hub, Clinical Research Unit (CRU), Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Egas Moniz—Cooperativa de Ensino Superior, CRL, 2829-511 Caparica, Portugal; (J.J.M.); (V.M.)
- Periodontology Department, Clinical Research Unit (CRU), Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Egas Moniz—Cooperata de Ensino Superior, CRL, 2829-511 Caparica, Portugal
- Correspondence:
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4
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Davis Armstrong NM, Spragley KJ, Chen WM, Hsu FC, Brewer MS, Horn PJ, Williams SR, Sale MM, Worrall BB, Keene KL. Multi-omic analysis of stroke recurrence in African Americans from the Vitamin Intervention for Stroke Prevention (VISP) clinical trial. PLoS One 2021; 16:e0247257. [PMID: 33661917 PMCID: PMC7932724 DOI: 10.1371/journal.pone.0247257] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 02/04/2021] [Indexed: 11/24/2022] Open
Abstract
African Americans endure a nearly two-fold greater risk of suffering a stroke and are 2–3 times more likely to die from stroke compared to those of European ancestry. African Americans also have a greater risk of recurrent stroke and vascular events, which are deadlier and more disabling than incident stroke. Stroke is a multifactorial disease with both heritable and environmental risk factors. We conducted an integrative, multi-omic study on 922 plasma metabolites, 473,864 DNA methylation loci, and 556 variants from 50 African American participants of the Vitamin Intervention for Stroke Prevention clinical trial to help elucidate biomarkers contributing to recurrent stroke rates in this high risk population. Sixteen metabolites, including cotinine, N-delta-acetylornithine, and sphingomyelin (d17:1/24:1) were identified in t-tests of recurrent stroke outcome or baseline smoking status. Serum tricosanoyl sphingomyelin (d18:1/23:0) levels were significantly associated with recurrent stroke after adjusting for covariates in Cox Proportional Hazards models. Weighted Gene Co-expression Network Analysis identified moderate correlations between sphingolipid markers and clinical traits including days to recurrent stroke. Integrative analyses between genetic variants in sphingolipid pathway genes identified 29 nominal associations with metabolite levels in a one-way analysis of variance, while epigenomic analyses identified xenobiotics, predominately smoking-associated metabolites and pharmaceutical drugs, associated with methylation profiles. Taken together, our results suggest that metabolites, specifically those associated with sphingolipid metabolism, are potential plasma biomarkers for stroke recurrence in African Americans. Furthermore, genetic variation and DNA methylation may play a role in the regulation of these metabolites.
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Affiliation(s)
- Nicole M. Davis Armstrong
- Department of Biology, East Carolina University, Greenville, North Carolina, United States of America
| | - Kelsey J. Spragley
- Department of Biology, East Carolina University, Greenville, North Carolina, United States of America
| | - Wei-Min Chen
- Center for Public Health Genomics, University of Virginia, Charlottesville, Virginia, United States of America
- Department of Public Health Sciences, University of Virginia, Charlottesville, Virginia, United States of America
| | - Fang-Chi Hsu
- Division of Public Health Sciences, Department of Biostatistics and Data Science, Wake Forest School of Medicine, Winston-Salem, North Carolina, United States of America
| | - Michael S. Brewer
- Department of Biology, East Carolina University, Greenville, North Carolina, United States of America
| | - Patrick J. Horn
- Department of Biology, East Carolina University, Greenville, North Carolina, United States of America
| | - Stephen R. Williams
- Department of Neurology, University of Virginia, Charlottesville, Virginia, United States of America
| | - Michèle M. Sale
- Center for Public Health Genomics, University of Virginia, Charlottesville, Virginia, United States of America
- Department of Public Health Sciences, University of Virginia, Charlottesville, Virginia, United States of America
| | - Bradford B. Worrall
- Department of Public Health Sciences, University of Virginia, Charlottesville, Virginia, United States of America
- Department of Neurology, University of Virginia, Charlottesville, Virginia, United States of America
| | - Keith L. Keene
- Department of Biology, East Carolina University, Greenville, North Carolina, United States of America
- Center for Health Disparities, Brody School of Medicine, East Carolina University, Greenville, North Carolina, United States of America
- * E-mail:
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5
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Hope S, Naerland T, Høiland AL, Torske T, Malt E, Abrahamsen T, Nerhus M, Wedervang-Resell K, Lonning V, Johannessen J, Steen NE, Agartz I, Stenberg N, Hundhausen T, Mørkrid L, Andreassen OA. Higher vitamin B12 levels in neurodevelopmental disorders than in healthy controls and schizophrenia: A comparison among participants between 2 and 53 years. FASEB J 2020; 34:8114-8124. [PMID: 32323402 DOI: 10.1096/fj.201900855rrr] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 03/16/2020] [Accepted: 04/02/2020] [Indexed: 12/23/2022]
Abstract
Recent studies suggest that both high and low levels of vitamin B12 (vitB12) may have negative health impacts. We measured VitB12 in patients with the Neurodevelopmental disorders (ND) (n = 222), comprised of Autism Spectrum Disorders, specific Developmental disorders, and Intellectual Disability (aged 2-53 years), schizophrenia (n = 401), and healthy controls (HC) (n = 483). Age-and gender-adjusted vitB12 z-scores were calculated by comparisons with a reference population (n = 76 148). We found higher vitB12 in ND (median 420 pmol/L, mean z-score: 0.30) than in HC (316 pmol/L, z-score: 0.06, P < .01) and schizophrenia (306 pmol/L, z-score: -0.02, P < .001), which was significant after adjusting for age, gender, vitB12 supplement, folate, hemoglobin, leukocytes, liver, and kidney function (P < .02). In ND, 20% (n = 44) had vitB12 above 650 pmol/L, and 1% (n = 3) had below 150 pmol/L (common reference limits). In 6.3% (n = 14) of ND, vitB12 was above 2SD of mean in the age-and gender-adjusted reference population, which was more frequent than in HC (n = 8, 1.6%), OR: 4.0, P = .001. Low vitB12 was equally frequent as in HC, and vitB12 z-scores were equal across the age groups. To conclude, vitB12 was higher in ND than in HC and schizophrenia, suggesting a specific feature of ND, which warrants further studies to investigate the underlying mechanisms.
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Affiliation(s)
- Sigrun Hope
- Department of Neuro Habilitation, Oslo University Hospital Ullevål, Oslo, Norway.,NORMENT, Norwegian Centre for Mental Disorders Research, Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Terje Naerland
- Department of Neuro Habilitation, Oslo University Hospital Ullevål, Oslo, Norway.,National Competence Center for Neurodevelopmental Disorders and Hypersomnias, Oslo University Hospital, Oslo, Norway
| | - Anne Lise Høiland
- Department of Pediatrics, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway.,Department of Mental Health, Faculty of Medicine and Health Sciences, Regional Center for Child and Youth Mental Health and Child Welfare, Norwegian University of Science and Technology, Trondheim, Norway
| | - Tonje Torske
- Division of Mental Health and Addiction, Vestre Viken Hospital Trust, Drammen, Norway
| | - Eva Malt
- Division of Mental Health, Akerhus University Hospital, Lørenskog, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Tore Abrahamsen
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway.,Department of Pediatrics, Oslo University Hospital, Oslo, Norway
| | - Mari Nerhus
- Department of Neuro Habilitation, Oslo University Hospital Ullevål, Oslo, Norway.,Division of Mental Health, Akerhus University Hospital, Lørenskog, Norway
| | - Kirsten Wedervang-Resell
- Department of Neuro Habilitation, Oslo University Hospital Ullevål, Oslo, Norway.,Division of Mental Health and Addiction, Oslo University Hospital Ullevål, Oslo, Norway
| | - Vera Lonning
- Department of Neuro Habilitation, Oslo University Hospital Ullevål, Oslo, Norway.,Division of Mental Health, Akerhus University Hospital, Lørenskog, Norway
| | | | - Nils Eiel Steen
- Department of Neuro Habilitation, Oslo University Hospital Ullevål, Oslo, Norway.,Division of Mental Health and Addiction, Oslo University Hospital Ullevål, Oslo, Norway
| | - Ingrid Agartz
- Department of Neuro Habilitation, Oslo University Hospital Ullevål, Oslo, Norway.,Department of Psychiatric Research, Diakonhjemmet Hospital, Oslo, Norway
| | - Nina Stenberg
- Division of Mental Health and Addiction, Oslo University Hospital Ullevål, Oslo, Norway
| | - Thomas Hundhausen
- Department of Natural Sciences, University of Agder, Kristiansand, Norway.,Department of Laboratory Medicine, Sørlandet Hospital Trust, Kristiansand, Norway
| | - Lars Mørkrid
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Ole A Andreassen
- Department of Neuro Habilitation, Oslo University Hospital Ullevål, Oslo, Norway.,Division of Mental Health and Addiction, Oslo University Hospital Ullevål, Oslo, Norway
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6
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Gagliano Taliun SA. Genetic determinants of low vitamin B12 levels in Alzheimer's disease risk. ALZHEIMER'S & DEMENTIA (AMSTERDAM, NETHERLANDS) 2019; 11:430-434. [PMID: 31206009 PMCID: PMC6558085 DOI: 10.1016/j.dadm.2019.04.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
INTRODUCTION There is observational evidence that low circulating levels of vitamin B12 are associated with an increased risk of Alzheimer's disease. METHODS We used a two-sample summary-statistics-based Mendelian randomization design to assess the relationship of genetic factors contributing to vitamin B12 with late-onset Alzheimer's disease risk. RESULTS Our results do not support a causal role of decreased vitamin B12 levels on Alzheimer's disease risk. DISCUSSION This work encourages research on other modifiable biomarkers for Alzheimer's disease risk.
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Affiliation(s)
- Sarah A. Gagliano Taliun
- Center for Statistical Genetics, University of Michigan School of Public Health, Ann Arbor, MI, USA
- Department of Biostatistics, University of Michigan School of Public Health, Ann Arbor, MI, USA
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7
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Loohuis LM, Albersen M, de Jong S, Wu T, Luykx JJ, Jans JJM, Verhoeven-Duif NM, Ophoff RA. The Alkaline Phosphatase (ALPL) Locus Is Associated with B6 Vitamer Levels in CSF and Plasma. Genes (Basel) 2018; 10:genes10010008. [PMID: 30583557 PMCID: PMC6357176 DOI: 10.3390/genes10010008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 12/13/2018] [Accepted: 12/14/2018] [Indexed: 01/27/2023] Open
Abstract
The active form of vitamin B6, pyridoxal phosphate (PLP), is essential for human metabolism. The brain is dependent on vitamin B6 for its neurotransmitter balance. To obtain insight into the genetic determinants of vitamin B6 homeostasis, we conducted a genome-wide association study (GWAS) of the B6 vitamers pyridoxal (PL), PLP and the degradation product of vitamin B6, pyridoxic acid (PA). We collected a unique sample set of cerebrospinal fluid (CSF) and plasma from the same healthy human subjects of Dutch ancestry (n = 493) and included concentrations and ratios in and between these body fluids in our analysis. Based on a multivariate joint analysis of all B6 vitamers and their ratios, we identified a genome-wide significant association at a locus on chromosome 1 containing the ALPL (alkaline phosphatase) gene (minimal p = 7.89 × 10−10, rs1106357, minor allele frequency (MAF) = 0.46), previously associated with vitamin B6 levels in blood. Subjects homozygous for the minor allele showed a 1.4-times-higher ratio between PLP and PL in plasma, and even a 1.6-times-higher ratio between PLP and PL in CSF than subjects homozygous for the major allele. In addition, we observed a suggestive association with the CSF:plasma ratio of PLP on chromosome 15 (minimal p = 7.93 × 10−7, and MAF = 0.06 for rs28789220). Even though this finding is not reaching genome-wide significance, it highlights the potential of our experimental setup for studying transport and metabolism across the blood–CSF barrier. This GWAS of B6 vitamers identifies alkaline phosphatase as a key regulator in human vitamin B6 metabolism in CSF as well as plasma. Furthermore, our results demonstrate the potential of genetic studies of metabolites in plasma and CSF to elucidate biological aspects underlying metabolite generation, transport and degradation.
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Affiliation(s)
- Loes M Loohuis
- Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles (UCLA), Los Angeles, CA 90095, USA.
| | - Monique Albersen
- Section Metabolic Diagnostics, Department of Genetics, University Medical Center (UMC), 3584 EA, Utrecht, The Netherlands.
| | - Simone de Jong
- Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles (UCLA), Los Angeles, CA 90095, USA.
| | - Timothy Wu
- Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles (UCLA), Los Angeles, CA 90095, USA.
| | - Jurjen J Luykx
- Department of Psychiatry, Rudolf Magnus Institute of Neuroscience, University Medical Center (UMC), 3584 CG, Utrecht, The Netherlands.
- Department of Translational Neuroscience, Human Neurogenetics Unit, Brain Center Rudolf Magnus, University Medical Center Utrecht (UMC), 3584 CG, Utrecht, The Netherlands.
| | - Judith J M Jans
- Section Metabolic Diagnostics, Department of Genetics, University Medical Center (UMC), 3584 EA, Utrecht, The Netherlands.
| | - Nanda M Verhoeven-Duif
- Section Metabolic Diagnostics, Department of Genetics, University Medical Center (UMC), 3584 EA, Utrecht, The Netherlands.
| | - Roel A Ophoff
- Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles (UCLA), Los Angeles, CA 90095, USA.
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8
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Shane B, Pangilinan F, Mills JL, Fan R, Gong T, Cropp CD, Kim Y, Ueland PM, Bailey-Wilson JE, Wilson AF, Brody LC, Molloy AM. The 677C→T variant of MTHFR is the major genetic modifier of biomarkers of folate status in a young, healthy Irish population. Am J Clin Nutr 2018; 108:1334-1341. [PMID: 30339177 PMCID: PMC6290363 DOI: 10.1093/ajcn/nqy209] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 07/25/2018] [Indexed: 01/02/2023] Open
Abstract
Background Genetic polymorphisms can explain some of the population- and individual-based variations in nutritional status biomarkers. Objective We sought to screen the entire human genome for common genetic polymorphisms that influence folate-status biomarkers in healthy individuals. Design We carried out candidate gene analyses and genome-wide association scans in 2232 young, healthy Irish subjects to evaluate which common genetic polymorphisms influence red blood cell folate, serum folate, and plasma total homocysteine. Results The 5,10-methylenetetrahydrofolate reductase (MTHFR) 677C→T (rs1801133) variant was the major genetic modifier of all 3 folate-related biomarkers in this Irish population and reached genome-wide significance for red blood cell folate (P = 1.37 × 10-17), serum folate (P = 2.82 × 10-11), and plasma total homocysteine (P = 1.26 × 10-19) concentrations. A second polymorphism in the MTHFR gene (rs3753584, P = 1.09 × 10-11) was the only additional MTHFR variant to exhibit any significant independent effect on red blood cell folate. Other MTHFR variants, including the 1298A→C variant (rs1801131), appeared to reach genome-wide significance, but these variants shared linkage disequilibrium with MTHFR 677C→T and were not significant when analyzed in MTHFR 677CC homozygotes. No additional non-MTHFR modifiers of red blood cell or plasma folate were detected. Two additional genome-wide significant modifiers of plasma homocysteine were found in the region of the dipeptidase 1 (DPEP1) gene on chromosome 16 and the Twist neighbor B (TWISTNB) gene on chromosome 7. Conclusions The MTHFR 677C→T variant is the predominant genetic modifier of folate status biomarkers in this healthy Irish population. It is not necessary to determine MTHFR 677C→T genotype to evaluate folate status because its effect is reflected in concentrations of standard folate biomarkers. The MTHFR 1298A→C variant had no independent effect on folate status biomarkers. To our knowledge, this is the first genome-wide association study report on red blood cell folate and the first report of an association between homocysteine and TWISTNB.
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Affiliation(s)
- Barry Shane
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, CA,Address correspondence to BS (e-mail: )
| | - Faith Pangilinan
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, MD
| | - James L Mills
- Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD
| | - Ruzong Fan
- Department of Biostatistics, Bioinformatics, and Biomathematics, Georgetown University Medical Center (GUMC), Washington, DC
| | - Tingting Gong
- Department of Biostatistics, Bioinformatics, and Biomathematics, Georgetown University Medical Center (GUMC), Washington, DC
| | - Cheryl D Cropp
- Computational and Statistical Genomics Branch, National Human Genome Research Institute, Bethesda, MD
| | - Yoonhee Kim
- Computational and Statistical Genomics Branch, National Human Genome Research Institute, Bethesda, MD
| | - Per M Ueland
- Department of Clinical Science, University of Bergen and Haukeland University Hospital, Bergen, Norway
| | - Joan E Bailey-Wilson
- Computational and Statistical Genomics Branch, National Human Genome Research Institute, Bethesda, MD
| | - Alexander F Wilson
- Computational and Statistical Genomics Branch, National Human Genome Research Institute, Bethesda, MD
| | - Lawrence C Brody
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, MD
| | - Anne M Molloy
- Department of Clinical Medicine, School of Medicine, Trinity College Dublin, Dublin, Ireland
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9
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Sabourin JA, Cropp CD, Sung H, Brody LC, Bailey-Wilson JE, Wilson AF. ComPaSS-GWAS: A method to reduce type I error in genome-wide association studies when replication data are not available. Genet Epidemiol 2018; 43:102-111. [PMID: 30334581 DOI: 10.1002/gepi.22168] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 09/10/2018] [Accepted: 09/26/2018] [Indexed: 01/22/2023]
Abstract
Results from association studies are traditionally corroborated by replicating the findings in an independent data set. Although replication studies may be comparable for the main trait or phenotype of interest, it is unlikely that secondary phenotypes will be comparable across studies, making replication problematic. Alternatively, there may simply not be a replication sample available because of the nature or frequency of the phenotype. In these situations, an approach based on complementary pairs stability selection for genome-wide association study (ComPaSS-GWAS), is proposed as an ad-hoc alternative to replication. In this method, the sample is randomly split into two conditionally independent halves multiple times (resamples) and a GWAS is performed on each half in each resample. Similar in spirit to testing for association with independent discovery and replication samples, a marker is corroborated if its p-value is significant in both halves of the resample. Simulation experiments were performed for both nongenetic and genetic models. The type I error rate and power of ComPaSS-GWAS were determined and compared to the statistical properties of a traditional GWAS. Simulation results show that the type I error rate decreased as the number of resamples increased with only a small reduction in power and that these results were comparable with those from a traditional GWAS. Blood levels of vitamin pyridoxal 5'-phosphate from the Trinity Student Study (TSS) were used to validate this approach. The results from the validation study were compared to, and were consistent with, those obtained from previously published independent replication data and functional studies.
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Affiliation(s)
- Jeremy A Sabourin
- Genometrics Section, Computational and Statistical Genomics Branch, National Human Genome Research Institute/National Institutes of Health (NHGRI/NIH), Baltimore, Maryland
| | - Cheryl D Cropp
- Statistical Genetics Section, Computational and Statistical Genomics Branch, National Human Genome Research Institute/National Institutes of Health (NHGRI/NIH), Baltimore, Maryland.,Integrated Cancer Genomics Division, Translational Genomics Research Institute (TGen), Phoenix, Arizona.,McWhorter School of Pharmacy, Samford University, Birmingham, Alabama
| | - Heejong Sung
- Genometrics Section, Computational and Statistical Genomics Branch, National Human Genome Research Institute/National Institutes of Health (NHGRI/NIH), Baltimore, Maryland
| | - Lawrence C Brody
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute/National Institutes of Health (NHGRI/NIH), Bethesda, Maryland
| | - Joan E Bailey-Wilson
- Statistical Genetics Section, Computational and Statistical Genomics Branch, National Human Genome Research Institute/National Institutes of Health (NHGRI/NIH), Baltimore, Maryland
| | - Alexander F Wilson
- Genometrics Section, Computational and Statistical Genomics Branch, National Human Genome Research Institute/National Institutes of Health (NHGRI/NIH), Baltimore, Maryland
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10
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Moen GH, Qvigstad E, Birkeland KI, Evans DM, Sommer C. Are serum concentrations of vitamin B-12 causally related to cardiometabolic risk factors and disease? A Mendelian randomization study. Am J Clin Nutr 2018; 108:398-404. [PMID: 29982347 DOI: 10.1093/ajcn/nqy101] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 04/24/2018] [Indexed: 12/15/2022] Open
Abstract
Background Several observational studies have shown that low serum vitamin B-12 is associated with increased body mass index (BMI) and adverse cardiometabolic outcomes. However, it is unclear if these associations reflect a causal effect of vitamin B-12 on cardiometabolic risk factors and diseases, latent confounding, or reverse causality. Objectives The aims of this study were to investigate 1) the possible causal relation between vitamin B-12 and indicators of body fat, lipid, and glucose variables; type 2 diabetes (T2D); and cardiovascular disease by using a 2-sample Mendelian randomization (MR) method and 2) the possible pleiotropic role of fucosyltransferase 2 (FUT2). Design We selected 11 single nucleotide polymorphisms (SNPs) robustly associated with serum concentrations of vitamin B-12 in a previous genomewide association study (GWAS) in 45,576 individuals. We performed 2-sample MR analyses of the relation between vitamin B-12 and cardiometabolic risk factors and diseases with the use of publicly available GWAS summary statistics for 15 outcomes in ≤339,224 individuals. The robustness of results was tested with sensitivity analyses by using MR Egger regression and weighted-median estimation, and by performing additional analyses excluding a variant in the FUT2 gene, which may be pleiotropic. Results We found a suggestive causal relation between vitamin B-12 and fasting glucose and β cell function [homeostatic model assessment (HOMA) of β cell function (HOMA-B)]. However, we found no evidence that serum concentrations of vitamin B-12 were causally related to BMI, waist-to-hip ratio, plasma leptin, body fat, fasting insulin, insulin resistance (from HOMA of insulin resistance), glycated hemoglobin, triglycerides, T2D, coronary artery disease, or HDL, LDL, or total cholesterol. Conclusions We found no evidence that serum concentrations of vitamin B-12 are causally related to body weight or the majority of cardiometabolic outcomes investigated. However, vitamin B-12 may have a causal effect on fasting glucose and HOMA-B, although these results will require replication in large independent data sets. This trialwas registered at http://www.isrctn.com/ISRCTN47414943 as ISRCTN47414943.
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Affiliation(s)
- Gunn-Helen Moen
- Department of Endocrinology, Morbid Obesity, and Preventive Medicine, Oslo University Hospital, Oslo, Norway
- Faculty of Medicine, University of Oslo, Institute of Clinical Medicine, Oslo, Norway
| | - Elisabeth Qvigstad
- Department of Endocrinology, Morbid Obesity, and Preventive Medicine, Oslo University Hospital, Oslo, Norway
| | - Kåre I Birkeland
- Department of Endocrinology, Morbid Obesity, and Preventive Medicine, Oslo University Hospital, Oslo, Norway
- Faculty of Medicine, University of Oslo, Institute of Clinical Medicine, Oslo, Norway
- Department of Transplantation Medicine, Institute of Clinical Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway
| | - David M Evans
- University of Queensland Diamantina Institute, Translational Research Institute, Brisbane, Australia
- Medical Research Council Integrative Epidemiology Unit, University of Bristol, Bristol, United Kingdom
| | - Christine Sommer
- Department of Endocrinology, Morbid Obesity, and Preventive Medicine, Oslo University Hospital, Oslo, Norway
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11
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Hu Y, Raffield LM, Polfus LM, Moscati A, Nadkarni G, Preuss MH, Zhong X, Wei Q, Rich SS, Li Y, Wilson JG, Correa A, Loos RJF, Li B, Auer PL, Reiner AP. A common TCN1 loss-of-function variant is associated with lower vitamin B 12 concentration in African Americans. Blood 2018; 131:2859-2863. [PMID: 29764838 PMCID: PMC6014360 DOI: 10.1182/blood-2018-03-841023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Affiliation(s)
- Yao Hu
- Public Health Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WA
| | - Laura M Raffield
- Department of Genetics, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Linda M Polfus
- Center for Genetic Epidemiology, Department of Preventative Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA
| | - Arden Moscati
- Charles Bronfman Institute for Personalized Medicine and
| | - Girish Nadkarni
- Department of Nephrology, Icahn School of Medicine at Mount Sinai, New York, NY
| | | | - Xue Zhong
- Vanderbilt Genetics Institute, Nashville, TN
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN
| | - Qiang Wei
- Vanderbilt Genetics Institute, Nashville, TN
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN
| | - Stephen S Rich
- Center for Public Health Genomics, University of Virginia, Charlottesville, VA
| | - Yun Li
- Department of Genetics
- Department of Biostatistics, and
- Department of Computer Science, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | | | - Adolfo Correa
- Department of Pediatrics and Medicine, University of Mississippi Medical Center, Jackson, MS
| | - Ruth J F Loos
- Charles Bronfman Institute for Personalized Medicine and
- Genetics of Obesity and Related Metabolic Traits Program and
- Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Bingshan Li
- Vanderbilt Genetics Institute, Nashville, TN
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN
| | - Paul L Auer
- Zilber School of Public Health, University of Wisconsin-Milwaukee, Milwaukee, WI; and
| | - Alex P Reiner
- Public Health Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WA
- Department of Epidemiology, University of Washington, Seattle, WA
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12
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Velkova A, Diaz JEL, Pangilinan F, Molloy AM, Mills JL, Shane B, Sanchez E, Cunningham C, McNulty H, Cropp CD, Bailey-Wilson JE, Wilson AF, Brody LC. The FUT2 secretor variant p.Trp154Ter influences serum vitamin B12 concentration via holo-haptocorrin, but not holo-transcobalamin, and is associated with haptocorrin glycosylation. Hum Mol Genet 2017; 26:4975-4988. [PMID: 29040465 PMCID: PMC5886113 DOI: 10.1093/hmg/ddx369] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 09/19/2017] [Accepted: 09/20/2017] [Indexed: 11/14/2022] Open
Abstract
Vitamin B12 deficiency is common in older individuals. Circulating vitamin B12 concentration can be used to diagnose deficiency, but this test has substantial false positive and false negative rates. We conducted genome-wide association studies (GWAS) in which we resolved total serum vitamin B12 into the fractions bound to transcobalamin and haptocorrin: two carrier proteins with very different biological properties. We replicated reported associations between total circulating vitamin B12 concentrations and a common null variant in FUT2. This allele determines the secretor phenotype in which blood group antigens are found in non-blood body fluids. Vitamin B12 bound to haptocorrin (holoHC) remained highly associated with FUT2 rs601338 (p.Trp154Ter). Transcobalamin bound vitamin B12 (holoTC) was not influenced by this variant. HoloTC is the bioactive the form of the vitamin and is taken up by all tissues. In contrast, holoHC is only taken up by the liver. Using holoHC from individuals with known FUT2 genotypes, we demonstrated that FUT2 rs601338 genotype influences the glycosylation of haptocorrin. We then developed an experimental model demonstrating that holoHC is transported into cultured hepatic cells (HepG2) via the asialoglycoprotein receptor (ASGR). Our data challenge current published hypotheses on the influence of genetic variation on this clinically important measure and are consistent with a model in which FUT2 rs601338 influences holoHC by altering haptocorrin glycosylation, whereas B12 bound to non-glycosylated transcobalamin (i.e. holoTC) is not affected. Our findings explain some of the observed disparity between use of total B12 or holoTC as first-line clinical tests of vitamin B12 status.
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Affiliation(s)
- Aneliya Velkova
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, MD 20892, USA
| | - Jennifer E L Diaz
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, MD 20892, USA
| | - Faith Pangilinan
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, MD 20892, USA
| | - Anne M Molloy
- Department of Clinical Medicine, School of Medicine, Trinity College Dublin, Dublin 2, Ireland
| | - James L Mills
- Division of Intramural Population Health Research, Eunice Kennedy Shriver NICHD, Bethesda, MD 20852, USA
| | - Barry Shane
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, CA 94720, USA
| | - Erica Sanchez
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, MD 20892, USA
| | | | - Helene McNulty
- Northern Ireland Centre for Food and Health, University of Ulster, Coleraine BT52 1SA, Northern Ireland
| | - Cheryl D Cropp
- Computational and Statistical Genomics Branch, National Human Genome Research Institute, Bethesda, MD 21224, USA
| | - Joan E Bailey-Wilson
- Computational and Statistical Genomics Branch, National Human Genome Research Institute, Bethesda, MD 21224, USA
| | - Alexander F Wilson
- Computational and Statistical Genomics Branch, National Human Genome Research Institute, Bethesda, MD 21224, USA
| | - Lawrence C Brody
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, MD 20892, USA
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13
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Owolabi M, Peprah E, Xu H, Akinyemi R, Tiwari HK, Irvin MR, Wahab KW, Arnett DK, Ovbiagele B. Advancing stroke genomic research in the age of Trans-Omics big data science: Emerging priorities and opportunities. J Neurol Sci 2017; 382:18-28. [PMID: 29111012 DOI: 10.1016/j.jns.2017.09.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 08/19/2017] [Accepted: 09/15/2017] [Indexed: 12/19/2022]
Abstract
BACKGROUND We systematically reviewed the genetic variants associated with stroke in genome-wide association studies (GWAS) and examined the emerging priorities and opportunities for rapidly advancing stroke research in the era of Trans-Omics science. METHODS Using the PRISMA guideline, we searched PubMed and NHGRI- EBI GWAS catalog for stroke studies from 2007 till May 2017. RESULTS We included 31 studies. The major challenge is that the few validated variants could not account for the full genetic risk of stroke and have not been translated for clinical use. None of the studies included continental Africans. Genomic study of stroke among Africans presents a unique opportunity for the discovery, validation, functional annotation, Trans-Omics study and translation of genomic determinants of stroke with implications for global populations. This is because all humans originated from Africa, a continent with a unique genomic architecture and a distinctive epidemiology of stroke; as well as substantially higher heritability and resolution of fine mapping of stroke genes. CONCLUSION Understanding the genomic determinants of stroke and the corresponding molecular mechanisms will revolutionize the development of a new set of precise biomarkers for stroke prediction, diagnosis and prognostic estimates as well as personalized interventions for reducing the global burden of stroke.
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Affiliation(s)
- Mayowa Owolabi
- Center for Genomic and Precision Medicine, College of Medicine, University of Ibadan, Ibadan, Nigeria; Department of Medicine, University of Ibadan, Ibadan, Nigeria.
| | - Emmanuel Peprah
- Center for Translation Research and Implementation Science, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Huichun Xu
- Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Rufus Akinyemi
- Center for Genomic and Precision Medicine, College of Medicine, University of Ibadan, Ibadan, Nigeria; Institute for Advanced Medical Research and Training, College of Medicine, University of Ibadan, Ibadan, Nigeria; Department of Medicine, University of Ibadan, Ibadan, Nigeria
| | - Hemant K Tiwari
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, USA
| | - Marguerite R Irvin
- Department of Epidemiology, University of Alabama at Birmingham, Birmingham, USA
| | - Kolawole Wasiu Wahab
- Department of Medicine, College of Health Sciences, University of Ilorin, Ilorin, Nigeria
| | - Donna K Arnett
- College of Public Health, University of Kentucky at Lexington, USA
| | - Bruce Ovbiagele
- Department of Neurology, Medical University of South Carolina, Charleston, USA
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14
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The Impact of Homocysteine, Vitamin B12, and Vitamin D Levels on Functional Outcome after First-Ever Ischaemic Stroke. BIOMED RESEARCH INTERNATIONAL 2017; 2017:5489057. [PMID: 28424785 PMCID: PMC5382296 DOI: 10.1155/2017/5489057] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 03/04/2017] [Accepted: 03/09/2017] [Indexed: 12/31/2022]
Abstract
We explored the relationship between acute ischaemic stroke (IS) early functional outcome and serum levels of homocysteine, vitamin B12, and D in a noninterventional prospective clinical study. We enrolled 50 patients with first-ever IS and performed laboratory tests and functional assessment at three time points: on admission and three and six months after stroke. Modified Rankin Scale (mRS), NIHSS scale, and Barthel index (BI) scores were assessed in all participants by trained examiner blinded to laboratory data. Patients did not receive treatment that might alter laboratory data. Admission NIHSS correlated with homocysteine levels (r = 0.304, p < 0.05), B12 level (r = −0.410, p < 0.01), and vitamin D levels (r = −0.465, p < 0.01). Functional outcome measures (BI and mRS) did not significantly correlate with homocysteine and vitamin D3 levels at 3 and 6 months. However, a positive correlation with vitamin B12 levels was detected for BI both at 3 and 6 months and mRS at 6 months. Higher serum vitamin B12 levels were associated with better functional outcome at follow-up.
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15
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Kim S, Nho K, Ramanan VK, Lai D, Foroud TM, Lane K, Murrell JR, Gao S, Hall KS, Unverzagt FW, Baiyewu O, Ogunniyi A, Gureje O, Kling MA, Doraiswamy PM, Kaddurah-Daouk R, Hendrie HC, Saykin AJ. Genetic Influences on Plasma Homocysteine Levels in African Americans and Yoruba Nigerians. J Alzheimers Dis 2016; 49:991-1003. [PMID: 26519441 DOI: 10.3233/jad-150651] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Plasma homocysteine, a metabolite involved in key cellular methylation processes seems to be implicated in cognitive functions and cardiovascular health with its high levels representing a potential modifiable risk factor for Alzheimer's disease (AD) and other dementias. A better understanding of the genetic factors regulating homocysteine levels, particularly in non-white populations, may help in risk stratification analyses of existing clinical trials and may point to novel targets for homocysteine-lowering therapy. To identify genetic influences on plasma homocysteine levels in individuals with African ancestry, we performed a targeted gene and pathway-based analysis using a priori biological information and then to identify new association performed a genome-wide association study. All analyses used combined data from the African American and Yoruba cohorts from the Indianapolis-Ibadan Dementia Project. Targeted analyses demonstrated significant associations of homocysteine and variants within the CBS (Cystathionine beta-Synthase) gene. We identified a novel genome-wide significant association of the AD risk gene CD2AP (CD2-associated protein) with plasma homocysteine levels in both cohorts. Minor allele (T) carriers of identified CD2AP variant (rs6940729) exhibited decreased homocysteine level. Pathway enrichment analysis identified several interesting pathways including the GABA receptor activation pathway. This is noteworthy given the known antagonistic effect of homocysteine on GABA receptors. These findings identify several new targets warranting further investigation in relation to the role of homocysteine in neurodegeneration.
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Affiliation(s)
- Sungeun Kim
- Center for Neuroimaging, Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN, USA.,Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA.,Center for Computational Biology and Bioinformatics, Indiana University School of Medicine, Indianapolis, IN, USA.,Indiana University Network Science Institute, Bloomington, IN, USA
| | - Kwangsik Nho
- Center for Neuroimaging, Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN, USA.,Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA.,Center for Computational Biology and Bioinformatics, Indiana University School of Medicine, Indianapolis, IN, USA.,Indiana University Network Science Institute, Bloomington, IN, USA
| | - Vijay K Ramanan
- Center for Neuroimaging, Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN, USA.,Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA.,Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA.,Department of Internal Medicine, Preliminary Medicine Residency, St. Vincent Indianapolis, Indianapolis, IN, USA
| | - Dongbing Lai
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Tatiana M Foroud
- Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA.,Center for Computational Biology and Bioinformatics, Indiana University School of Medicine, Indianapolis, IN, USA.,Indiana University Network Science Institute, Bloomington, IN, USA.,Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Katie Lane
- Department of Biostatistics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Jill R Murrell
- Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA.,Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Sujuan Gao
- Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA.,Department of Biostatistics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Kathleen S Hall
- Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Frederick W Unverzagt
- Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Olusegun Baiyewu
- Department of Psychiatry, College of Medicine, University of Ibadan, Ibadan, Nigeria
| | - Adesola Ogunniyi
- Department of Medicine, College of Medicine, University of Ibadan, Ibadan, Nigeria
| | - Oye Gureje
- Department of Psychiatry, College of Medicine, University of Ibadan, Ibadan, Nigeria
| | - Mitchel A Kling
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Behavioral Health Service, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, PA, USA
| | - P Murali Doraiswamy
- Department of Psychiatry and Behavioral Sciences, Duke University, Durham, NC, USA.,Duke Institute for Brain Sciences, Duke University, Durham, NC, USA
| | - Rima Kaddurah-Daouk
- Department of Psychiatry and Behavioral Sciences, Duke University, Durham, NC, USA.,Duke Institute for Brain Sciences, Duke University, Durham, NC, USA.,Pharmacometabolomics Center, Duke University, Durham, NC, USA
| | - Hugh C Hendrie
- Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN, USA.,Indiana University Center for Aging Research, Indianapolis, IN, USA.,Regenstrief Institute Inc., Indianapolis, IN, USA
| | - Andrew J Saykin
- Center for Neuroimaging, Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN, USA.,Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA.,Center for Computational Biology and Bioinformatics, Indiana University School of Medicine, Indianapolis, IN, USA.,Indiana University Network Science Institute, Bloomington, IN, USA.,Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA
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16
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Erytrocyte-related phenotypes and genetic susceptibility to thrombosis. Blood Cells Mol Dis 2016; 59:44-8. [DOI: 10.1016/j.bcmd.2016.04.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 04/12/2016] [Indexed: 11/20/2022]
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17
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Brown CJ. Preservation of retinal structure and function after cilioretinal artery occlusion: a case report. Int Med Case Rep J 2016; 9:29-34. [PMID: 26929671 PMCID: PMC4755464 DOI: 10.2147/imcrj.s96858] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Cilioretinal artery occlusion is a cause of sudden, often catastrophic loss of central vision. There are no established effective treatments. Recently, a patient presented 24 hours after a cilioretinal artery occlusion, following a cardiac catheterization prior to which her blood thinners had been discontinued. Lacking an effective way to address the severe retinal ischemic oxidative stress, she was offered, under compassionate use, a multivitamin complex designed to address retinal ischemia and oxidative stress. Significant components of this product are L-methylfolate and n-acetyl cysteine. The patient experienced a rapid unexpected improvement in vision and preservation of retinal structure, suggesting that marked improvement in retinal artery occlusions outcomes may be possible as late as 24 hours postocclusion. This is the third reported case of cilioretinal artery occlusion associated with cardiac catheterization.
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Carter TC, Pangilinan F, Molloy AM, Fan R, Wang Y, Shane B, Gibney ER, Midttun Ø, Ueland PM, Cropp CD, Kim Y, Wilson AF, Bailey-Wilson JE, Brody LC, Mills JL. Common Variants at Putative Regulatory Sites of the Tissue Nonspecific Alkaline Phosphatase Gene Influence Circulating Pyridoxal 5'-Phosphate Concentration in Healthy Adults. J Nutr 2015; 145:1386-93. [PMID: 25972531 PMCID: PMC4478949 DOI: 10.3945/jn.114.208769] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Accepted: 04/13/2015] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Vitamin B-6 interconversion enzymes are important for supplying pyridoxal 5'-phosphate (PLP), the co-enzyme form, to tissues. Variants in the genes for these enzymes [tissue nonspecific alkaline phosphatase (ALPL), pyridoxamine 5'-phosphate oxidase, pyridoxal kinase, and pyridoxal phosphatase] could affect enzyme function and vitamin B-6 status. OBJECTIVES We tested whether single-nucleotide polymorphisms (SNPs) in these genes influence vitamin B-6 status markers [plasma PLP, pyridoxal (PL), and 4-pyridoxic acid (PA)], and explored potential functional effects of the SNPs. METHODS Study subjects were young, healthy adults from Ireland (n = 2345). We measured plasma PLP, PL, and PA with liquid chromatography-tandem mass spectrometry and genotyped 66 tag SNPs in the 4 genes. We tested for associations with single SNPs in candidate genes and also performed genome-wide association study (GWAS) and gene-based analyses. RESULTS Seventeen SNPs in ALPL were associated with altered plasma PLP in candidate gene analyses (P < 1.89 × 10(-4)). In the GWAS, 5 additional ALPL SNPs were associated with altered plasma PLP (P < 5.0 × 10(-8)). Gene-based analyses that used the functional linear model β-spline (P = 4.04 × 10(-15)) and Fourier spline (P = 5.87 × 10(-15)) methods also showed associations between ALPL and altered plasma PLP. No SNPs in other genes were associated with plasma PLP. The association of the minor CC genotype of 1 ALPL SNP, rs1256341, with reduced ALPL expression in the HapMap Northern European ancestry population is consistent with the positive association between the CC genotype and plasma PLP in our study (P = 0.008). No SNP was associated with altered plasma PL or PA. CONCLUSIONS In healthy adults, common variants in ALPL influence plasma PLP concentration, the most frequently used biomarker for vitamin B-6 status. Whether these associations are indicative of functional changes in vitamin B-6 status requires more investigation.
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Affiliation(s)
- Tonia C Carter
- Center for Human Genetics, Marshfield Clinic, Marshfield, WI
| | | | - Anne M Molloy
- Institute of Molecular Medicine, School of Medicine, Trinity College Dublin, Dublin, Ireland
| | - Ruzong Fan
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, MD
| | - Yifan Wang
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, MD
| | - Barry Shane
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, CA
| | - Eileen R Gibney
- UCD Institute of Food and Health, University College Dublin, Dublin, Ireland
| | | | - Per M Ueland
- Department of Clinical Science, University of Bergen, Bergen, Norway
| | | | | | | | | | | | - James L Mills
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, MD;
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Abstract
Measures of B6 status are categorized as direct biomarkers and as functional biomarkers. Direct biomarkers measure B6 vitamers in plasma/serum, urine and erythrocytes, and among these plasma pyridoxal 5'-phosphate (PLP) is most commonly used. Functional biomarkers include erythrocyte transaminase activities and, more recently, plasma levels of metabolites involved in PLP-dependent reactions, such as the kynurenine pathway, one-carbon metabolism, transsulfuration (cystathionine), and glycine decarboxylation (serine and glycine). Vitamin B6 status is best assessed by using a combination of biomarkers because of the influence of potential confounders, such as inflammation, alkaline phosphatase activity, low serum albumin, renal function, and inorganic phosphate. Ratios between substrate-products pairs have recently been investigated as a strategy to attenuate such influence. These efforts have provided promising new markers such as the PAr index, the 3-hydroxykynurenine:xanthurenic acid ratio, and the oxoglutarate:glutamate ratio. Targeted metabolic profiling or untargeted metabolomics based on mass spectrometry allow the simultaneous quantification of a large number of metabolites, which are currently evaluated as functional biomarkers, using data reduction statistics.
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Affiliation(s)
- Per Magne Ueland
- Department of Clinical Science, University of Bergen, and the Laboratory of Clinical Biochemistry, Haukeland University Hospital, 5021 Bergen, Norway;
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