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Vitamin D and cognitive function: A Mendelian randomisation study.

Identifieur interne : 000036 ( PubMed/Checkpoint ); précédent : 000035; suivant : 000037

Vitamin D and cognitive function: A Mendelian randomisation study.

Auteurs : Jane Maddock [Royaume-Uni] ; Ang Zhou [Australie] ; Alana Cavadino [Royaume-Uni] ; El Bieta Ku Ma [Royaume-Uni] ; Yanchun Bao [Royaume-Uni] ; Melissa C. Smart [Royaume-Uni] ; Kai-Uwe Saum [Allemagne] ; Ben Schöttker [Allemagne] ; Jorgen Engmann [Royaume-Uni] ; Marie Kj Rgaard [Norvège] ; Ville Karhunen [Finlande] ; Yiqiang Zhan [Suède] ; Terho Lehtim Ki [Finlande] ; Suvi P. Rovio [Finlande] ; Liisa Byberg [Suède] ; Jari Lahti [Finlande] ; Pedro Marques-Vidal [Suisse] ; Abhijit Sen [Norvège] ; Laura Perna [Allemagne] ; Henrik Schirmer [Norvège] ; Archana Singh-Manoux [Royaume-Uni] ; Juha Auvinen [Finlande] ; Nina Hutri-K Hönen [Finlande] ; Mika K Hönen [Finlande] ; Lena Kilander [Suède] ; Katri R Ikkönen [Finlande] ; H Kan Melhus [Suède] ; Erik Ingelsson [Suède] ; Idris Guessous [Suisse] ; Katja E. Petrovic [Autriche] ; Helena Schmidt [Autriche] ; Reinhold Schmidt [Autriche] ; Peter Vollenweider [Suisse] ; Lars Lind [Suède] ; Johan G. Eriksson [Finlande] ; Karl Michaëlsson [Suède] ; Olli T. Raitakari [Finlande] ; Sara H Gg [Suède] ; Nancy L. Pedersen [Suède] ; Karl-Heinz Herzig [Finlande] ; Marjo-Riitta J Rvelin [Finlande] ; Juha Veijola [Finlande] ; Mika Kivimaki [Royaume-Uni] ; Rolf Jorde [Norvège] ; Hermann Brenner [Allemagne] ; Meena Kumari [Royaume-Uni] ; Chris Power [Royaume-Uni] ; David J. Llewellyn [Royaume-Uni] ; Elina Hyppönen [Royaume-Uni]

Source :

RBID : pubmed:29038561

Abstract

The causal nature of the association between hypovitaminosis D and poor cognitive function in mid- to later-life is uncertain. Using a Mendelian randomisation(MR) approach, we examined the causal relationship between 25(OH)D and cognitive function. Data came from 172,349 participants from 17 cohorts. DHCR7(rs12785878), CYP2R1 rs12794714) and their combined synthesis score were chosen to proxy 25(OH)D. Cognitive tests were standardised into global and memory scores. Analyses were stratified by 25(OH)D tertiles, sex and age. Random effects meta-analyses assessed associations between 25(OH)D and cognitive function. Associations of serum 25(OH)D with global and memory-related cognitive function were non-linear (lower cognitive scores for both low and high 25(OH)D, p curvature ≤ 0.006), with much of the curvature attributed to a single study. DHCR7, CYP2R1, and the synthesis score were associated with small reductions in 25(OH)D per vitamin D-decreasing allele. However, coefficients for associations with global or memory-related cognitive function were non-significant and in opposing directions for DHCR7 and CYP2R1, with no overall association observed for the synthesis score. Coefficients for the synthesis score and global and memory cognition were similar when stratified by 25(OH)D tertiles, sex and age. We found no evidence for serum 25(OH)D concentration as a causal factor for cognitive performance in mid- to later life.

DOI: 10.1038/s41598-017-13189-3
PubMed: 29038561


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<country xml:lang="fr">Allemagne</country>
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<nlm:affiliation>Center for Life Course Health Research, University of Oulu, Oulu, Finland.</nlm:affiliation>
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<nlm:affiliation>Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.</nlm:affiliation>
<country xml:lang="fr">Suède</country>
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<nlm:affiliation>Department of Surgical Sciences, Uppsala University, Uppsala, Sweden.</nlm:affiliation>
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<country xml:lang="fr">Allemagne</country>
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<nlm:affiliation>Department of Epidemiology and Public Health, University College London, London, United Kingdom.</nlm:affiliation>
<country xml:lang="fr">Royaume-Uni</country>
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<settlement type="city">Londres</settlement>
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<region type="région" nuts="1">Grand Londres</region>
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</placeName>
<orgName type="university">University College de Londres</orgName>
</affiliation>
</author>
<author>
<name sortKey="Auvinen, Juha" sort="Auvinen, Juha" uniqKey="Auvinen J" first="Juha" last="Auvinen">Juha Auvinen</name>
<affiliation wicri:level="1">
<nlm:affiliation>Center for Life Course Health Research, University of Oulu, Oulu, Finland.</nlm:affiliation>
<country xml:lang="fr">Finlande</country>
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</author>
<author>
<name sortKey="Hutri K Honen, Nina" sort="Hutri K Honen, Nina" uniqKey="Hutri K Honen N" first="Nina" last="Hutri-K Hönen">Nina Hutri-K Hönen</name>
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<nlm:affiliation>Department of Pediatrics, Tampere University Hospital and Faculty of Medicine and Life Sciences, University of Tampere, Tampere, Finland.</nlm:affiliation>
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<wicri:regionArea>Department of Pediatrics, Tampere University Hospital and Faculty of Medicine and Life Sciences, University of Tampere, Tampere</wicri:regionArea>
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</affiliation>
</author>
<author>
<name sortKey="K Honen, Mika" sort="K Honen, Mika" uniqKey="K Honen M" first="Mika" last="K Hönen">Mika K Hönen</name>
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<nlm:affiliation>Department of Clinical Physiology, Tampere University Hospital and Faculty  of Medicine and Life Sciences, University of Tampere, Tampere, Finland.</nlm:affiliation>
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</affiliation>
</author>
<author>
<name sortKey="Kilander, Lena" sort="Kilander, Lena" uniqKey="Kilander L" first="Lena" last="Kilander">Lena Kilander</name>
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<nlm:affiliation>Department of Public Health and Caring Sciences, Uppsala University, Uppsala, Sweden.</nlm:affiliation>
<country xml:lang="fr">Suède</country>
<wicri:regionArea>Department of Public Health and Caring Sciences, Uppsala University, Uppsala</wicri:regionArea>
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<settlement type="city">Uppsala</settlement>
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<region nuts="1">East Middle Sweden</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="R Ikkonen, Katri" sort="R Ikkonen, Katri" uniqKey="R Ikkonen K" first="Katri" last="R Ikkönen">Katri R Ikkönen</name>
<affiliation wicri:level="4">
<nlm:affiliation>Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland.</nlm:affiliation>
<country xml:lang="fr">Finlande</country>
<wicri:regionArea>Department of Psychology and Logopedics, University of Helsinki, Helsinki</wicri:regionArea>
<orgName type="university">Université d'Helsinki</orgName>
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<settlement type="city">Helsinki</settlement>
<region type="région" nuts="2">Uusimaa</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Melhus, H Kan" sort="Melhus, H Kan" uniqKey="Melhus H" first="H Kan" last="Melhus">H Kan Melhus</name>
<affiliation wicri:level="4">
<nlm:affiliation>Department of Medical Sciences, Uppsala University, Uppsala, Sweden.</nlm:affiliation>
<country xml:lang="fr">Suède</country>
<wicri:regionArea>Department of Medical Sciences, Uppsala University, Uppsala</wicri:regionArea>
<orgName type="university">Université d'Uppsala</orgName>
<placeName>
<settlement type="city">Uppsala</settlement>
<region nuts="1">Svealand</region>
<region nuts="1">East Middle Sweden</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Ingelsson, Erik" sort="Ingelsson, Erik" uniqKey="Ingelsson E" first="Erik" last="Ingelsson">Erik Ingelsson</name>
<affiliation wicri:level="4">
<nlm:affiliation>Department of Medical Sciences, Uppsala University, Uppsala, Sweden.</nlm:affiliation>
<country xml:lang="fr">Suède</country>
<wicri:regionArea>Department of Medical Sciences, Uppsala University, Uppsala</wicri:regionArea>
<orgName type="university">Université d'Uppsala</orgName>
<placeName>
<settlement type="city">Uppsala</settlement>
<region nuts="1">Svealand</region>
<region nuts="1">East Middle Sweden</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Guessous, Idris" sort="Guessous, Idris" uniqKey="Guessous I" first="Idris" last="Guessous">Idris Guessous</name>
<affiliation wicri:level="1">
<nlm:affiliation>Unit of Population Epidemiology, Division of Primary Care Medicine, Department of Community Medicine, Primary Care and Emergency Medicine, Geneva University Hospitals, Geneva, Switzerland.</nlm:affiliation>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Unit of Population Epidemiology, Division of Primary Care Medicine, Department of Community Medicine, Primary Care and Emergency Medicine, Geneva University Hospitals, Geneva</wicri:regionArea>
<wicri:noRegion>Geneva</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Petrovic, Katja E" sort="Petrovic, Katja E" uniqKey="Petrovic K" first="Katja E" last="Petrovic">Katja E. Petrovic</name>
<affiliation wicri:level="1">
<nlm:affiliation>Division of General Neurology, Department of Neurology, General Hospital and Medical University of Graz, Graz, Austria.</nlm:affiliation>
<country xml:lang="fr">Autriche</country>
<wicri:regionArea>Division of General Neurology, Department of Neurology, General Hospital and Medical University of Graz, Graz</wicri:regionArea>
<wicri:noRegion>Graz</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Schmidt, Helena" sort="Schmidt, Helena" uniqKey="Schmidt H" first="Helena" last="Schmidt">Helena Schmidt</name>
<affiliation wicri:level="1">
<nlm:affiliation>Research Unit for Genetic Epidemiology, Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, Graz, Austria.</nlm:affiliation>
<country xml:lang="fr">Autriche</country>
<wicri:regionArea>Research Unit for Genetic Epidemiology, Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, Graz</wicri:regionArea>
<wicri:noRegion>Graz</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Schmidt, Reinhold" sort="Schmidt, Reinhold" uniqKey="Schmidt R" first="Reinhold" last="Schmidt">Reinhold Schmidt</name>
<affiliation wicri:level="1">
<nlm:affiliation>Department of Neurology, Clinical Division of Neurogeriatrics, Medical University Graz, Graz, Austria.</nlm:affiliation>
<country xml:lang="fr">Autriche</country>
<wicri:regionArea>Department of Neurology, Clinical Division of Neurogeriatrics, Medical University Graz, Graz</wicri:regionArea>
<wicri:noRegion>Graz</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Vollenweider, Peter" sort="Vollenweider, Peter" uniqKey="Vollenweider P" first="Peter" last="Vollenweider">Peter Vollenweider</name>
<affiliation wicri:level="3">
<nlm:affiliation>Department of Medicine, Internal Medicine, Lausanne University Hospital, Lausanne, Switzerland.</nlm:affiliation>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Medicine, Internal Medicine, Lausanne University Hospital, Lausanne</wicri:regionArea>
<placeName>
<settlement type="city">Lausanne</settlement>
<region nuts="3" type="region">Canton de Vaud</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Lind, Lars" sort="Lind, Lars" uniqKey="Lind L" first="Lars" last="Lind">Lars Lind</name>
<affiliation wicri:level="4">
<nlm:affiliation>Department of Medical Sciences, Uppsala University, Uppsala, Sweden.</nlm:affiliation>
<country xml:lang="fr">Suède</country>
<wicri:regionArea>Department of Medical Sciences, Uppsala University, Uppsala</wicri:regionArea>
<orgName type="university">Université d'Uppsala</orgName>
<placeName>
<settlement type="city">Uppsala</settlement>
<region nuts="1">Svealand</region>
<region nuts="1">East Middle Sweden</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Eriksson, Johan G" sort="Eriksson, Johan G" uniqKey="Eriksson J" first="Johan G" last="Eriksson">Johan G. Eriksson</name>
<affiliation wicri:level="1">
<nlm:affiliation>Department of General Practice and Primary Health Care, University of Helsinki and Helsinki University Hospital, University of Helsinki, Helsinki, Finland.</nlm:affiliation>
<country xml:lang="fr">Finlande</country>
<wicri:regionArea>Department of General Practice and Primary Health Care, University of Helsinki and Helsinki University Hospital, University of Helsinki, Helsinki</wicri:regionArea>
<wicri:noRegion>Helsinki</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Michaelsson, Karl" sort="Michaelsson, Karl" uniqKey="Michaelsson K" first="Karl" last="Michaëlsson">Karl Michaëlsson</name>
<affiliation wicri:level="4">
<nlm:affiliation>Department of Surgical Sciences, Uppsala University, Uppsala, Sweden.</nlm:affiliation>
<country xml:lang="fr">Suède</country>
<wicri:regionArea>Department of Surgical Sciences, Uppsala University, Uppsala</wicri:regionArea>
<orgName type="university">Université d'Uppsala</orgName>
<placeName>
<settlement type="city">Uppsala</settlement>
<region nuts="1">Svealand</region>
<region nuts="1">East Middle Sweden</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Raitakari, Olli T" sort="Raitakari, Olli T" uniqKey="Raitakari O" first="Olli T" last="Raitakari">Olli T. Raitakari</name>
<affiliation wicri:level="4">
<nlm:affiliation>Research Centre of Applied and Preventive Cardiovascular Medicine, University of Turku, Turku, Finland.</nlm:affiliation>
<country xml:lang="fr">Finlande</country>
<wicri:regionArea>Research Centre of Applied and Preventive Cardiovascular Medicine, University of Turku, Turku</wicri:regionArea>
<placeName>
<settlement type="city">Turku</settlement>
<region type="région" nuts="2">Finlande occidentale</region>
<settlement type="city">Turku</settlement>
</placeName>
<orgName type="university">Université de Turku</orgName>
</affiliation>
</author>
<author>
<name sortKey="H Gg, Sara" sort="H Gg, Sara" uniqKey="H Gg S" first="Sara" last="H Gg">Sara H Gg</name>
<affiliation wicri:level="3">
<nlm:affiliation>Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.</nlm:affiliation>
<country xml:lang="fr">Suède</country>
<wicri:regionArea>Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm</wicri:regionArea>
<placeName>
<settlement type="city">Stockholm</settlement>
<region nuts="2">Svealand</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Pedersen, Nancy L" sort="Pedersen, Nancy L" uniqKey="Pedersen N" first="Nancy L" last="Pedersen">Nancy L. Pedersen</name>
<affiliation wicri:level="3">
<nlm:affiliation>Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.</nlm:affiliation>
<country xml:lang="fr">Suède</country>
<wicri:regionArea>Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm</wicri:regionArea>
<placeName>
<settlement type="city">Stockholm</settlement>
<region nuts="2">Svealand</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Herzig, Karl Heinz" sort="Herzig, Karl Heinz" uniqKey="Herzig K" first="Karl-Heinz" last="Herzig">Karl-Heinz Herzig</name>
<affiliation wicri:level="1">
<nlm:affiliation>Research Unit of Biomedicine, University of Oulu, Oulu, Finland.</nlm:affiliation>
<country xml:lang="fr">Finlande</country>
<wicri:regionArea>Research Unit of Biomedicine, University of Oulu, Oulu</wicri:regionArea>
<wicri:noRegion>Oulu</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="J Rvelin, Marjo Riitta" sort="J Rvelin, Marjo Riitta" uniqKey="J Rvelin M" first="Marjo-Riitta" last="J Rvelin">Marjo-Riitta J Rvelin</name>
<affiliation wicri:level="1">
<nlm:affiliation>Center for Life Course Health Research, University of Oulu, Oulu, Finland.</nlm:affiliation>
<country xml:lang="fr">Finlande</country>
<wicri:regionArea>Center for Life Course Health Research, University of Oulu, Oulu</wicri:regionArea>
<wicri:noRegion>Oulu</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Veijola, Juha" sort="Veijola, Juha" uniqKey="Veijola J" first="Juha" last="Veijola">Juha Veijola</name>
<affiliation wicri:level="1">
<nlm:affiliation>Medical Research Center (MRC) and Oulu University Hospital, Oulu, Finland.</nlm:affiliation>
<country xml:lang="fr">Finlande</country>
<wicri:regionArea>Medical Research Center (MRC) and Oulu University Hospital, Oulu</wicri:regionArea>
<wicri:noRegion>Oulu</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Kivimaki, Mika" sort="Kivimaki, Mika" uniqKey="Kivimaki M" first="Mika" last="Kivimaki">Mika Kivimaki</name>
<affiliation wicri:level="4">
<nlm:affiliation>Department of Epidemiology and Public Health, University College London, London, United Kingdom.</nlm:affiliation>
<country xml:lang="fr">Royaume-Uni</country>
<wicri:regionArea>Department of Epidemiology and Public Health, University College London, London</wicri:regionArea>
<placeName>
<settlement type="city">Londres</settlement>
<region type="country">Angleterre</region>
<region type="région" nuts="1">Grand Londres</region>
<settlement type="city">Londres</settlement>
</placeName>
<orgName type="university">University College de Londres</orgName>
</affiliation>
</author>
<author>
<name sortKey="Jorde, Rolf" sort="Jorde, Rolf" uniqKey="Jorde R" first="Rolf" last="Jorde">Rolf Jorde</name>
<affiliation wicri:level="1">
<nlm:affiliation>Division of Internal Medicine, University Hospital of North Norway, Tromsø, Norway.</nlm:affiliation>
<country xml:lang="fr">Norvège</country>
<wicri:regionArea>Division of Internal Medicine, University Hospital of North Norway, Tromsø</wicri:regionArea>
<wicri:noRegion>Tromsø</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Brenner, Hermann" sort="Brenner, Hermann" uniqKey="Brenner H" first="Hermann" last="Brenner">Hermann Brenner</name>
<affiliation wicri:level="3">
<nlm:affiliation>Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Heidelberg, Germany.</nlm:affiliation>
<country xml:lang="fr">Allemagne</country>
<wicri:regionArea>Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Heidelberg</wicri:regionArea>
<placeName>
<region type="land" nuts="1">Bade-Wurtemberg</region>
<region type="district" nuts="2">District de Karlsruhe</region>
<settlement type="city">Heidelberg</settlement>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Kumari, Meena" sort="Kumari, Meena" uniqKey="Kumari M" first="Meena" last="Kumari">Meena Kumari</name>
<affiliation wicri:level="1">
<nlm:affiliation>Institute for Social and Economic Research (ISER), University of Essex, Colchester, United Kingdom.</nlm:affiliation>
<country xml:lang="fr">Royaume-Uni</country>
<wicri:regionArea>Institute for Social and Economic Research (ISER), University of Essex, Colchester</wicri:regionArea>
<wicri:noRegion>Colchester</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Power, Chris" sort="Power, Chris" uniqKey="Power C" first="Chris" last="Power">Chris Power</name>
<affiliation wicri:level="3">
<nlm:affiliation>Population, Policy and Practice, UCL Great Ormond Street Institute of Child Health, London, United Kingdom.</nlm:affiliation>
<country xml:lang="fr">Royaume-Uni</country>
<wicri:regionArea>Population, Policy and Practice, UCL Great Ormond Street Institute of Child Health, London</wicri:regionArea>
<placeName>
<settlement type="city">Londres</settlement>
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<region type="région" nuts="1">Grand Londres</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Llewellyn, David J" sort="Llewellyn, David J" uniqKey="Llewellyn D" first="David J" last="Llewellyn">David J. Llewellyn</name>
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<nlm:affiliation>University of Exeter Medical School, Exeter, United Kingdom.</nlm:affiliation>
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<wicri:noRegion>Exeter</wicri:noRegion>
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<author>
<name sortKey="Hypponen, Elina" sort="Hypponen, Elina" uniqKey="Hypponen E" first="Elina" last="Hyppönen">Elina Hyppönen</name>
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<nlm:affiliation>Population, Policy and Practice, UCL Great Ormond Street Institute of Child Health, London, United Kingdom. elina.hypponen@unisa.edu.au.</nlm:affiliation>
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<settlement type="city">Londres</settlement>
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<region type="région" nuts="1">Grand Londres</region>
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<series>
<title level="j">Scientific reports</title>
<idno type="eISSN">2045-2322</idno>
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<div type="abstract" xml:lang="en">The causal nature of the association between hypovitaminosis D and poor cognitive function in mid- to later-life is uncertain. Using a Mendelian randomisation(MR) approach, we examined the causal relationship between 25(OH)D and cognitive function. Data came from 172,349 participants from 17 cohorts. DHCR7(rs12785878), CYP2R1 rs12794714) and their combined synthesis score were chosen to proxy 25(OH)D. Cognitive tests were standardised into global and memory scores. Analyses were stratified by 25(OH)D tertiles, sex and age. Random effects meta-analyses assessed associations between 25(OH)D and cognitive function. Associations of serum 25(OH)D with global and memory-related cognitive function were non-linear (lower cognitive scores for both low and high 25(OH)D, p curvature ≤ 0.006), with much of the curvature attributed to a single study. DHCR7, CYP2R1, and the synthesis score were associated with small reductions in 25(OH)D per vitamin D-decreasing allele. However, coefficients for associations with global or memory-related cognitive function were non-significant and in opposing directions for DHCR7 and CYP2R1, with no overall association observed for the synthesis score. Coefficients for the synthesis score and global and memory cognition were similar when stratified by 25(OH)D tertiles, sex and age. We found no evidence for serum 25(OH)D concentration as a causal factor for cognitive performance in mid- to later life.</div>
</front>
</TEI>
<pubmed>
<MedlineCitation Status="In-Data-Review" Owner="NLM">
<PMID Version="1">29038561</PMID>
<DateCreated>
<Year>2017</Year>
<Month>10</Month>
<Day>17</Day>
</DateCreated>
<DateRevised>
<Year>2017</Year>
<Month>11</Month>
<Day>18</Day>
</DateRevised>
<Article PubModel="Electronic">
<Journal>
<ISSN IssnType="Electronic">2045-2322</ISSN>
<JournalIssue CitedMedium="Internet">
<Volume>7</Volume>
<Issue>1</Issue>
<PubDate>
<Year>2017</Year>
<Month>Oct</Month>
<Day>16</Day>
</PubDate>
</JournalIssue>
<Title>Scientific reports</Title>
<ISOAbbreviation>Sci Rep</ISOAbbreviation>
</Journal>
<ArticleTitle>Vitamin D and cognitive function: A Mendelian randomisation study.</ArticleTitle>
<Pagination>
<MedlinePgn>13230</MedlinePgn>
</Pagination>
<ELocationID EIdType="doi" ValidYN="Y">10.1038/s41598-017-13189-3</ELocationID>
<Abstract>
<AbstractText>The causal nature of the association between hypovitaminosis D and poor cognitive function in mid- to later-life is uncertain. Using a Mendelian randomisation(MR) approach, we examined the causal relationship between 25(OH)D and cognitive function. Data came from 172,349 participants from 17 cohorts. DHCR7(rs12785878), CYP2R1 rs12794714) and their combined synthesis score were chosen to proxy 25(OH)D. Cognitive tests were standardised into global and memory scores. Analyses were stratified by 25(OH)D tertiles, sex and age. Random effects meta-analyses assessed associations between 25(OH)D and cognitive function. Associations of serum 25(OH)D with global and memory-related cognitive function were non-linear (lower cognitive scores for both low and high 25(OH)D, p curvature ≤ 0.006), with much of the curvature attributed to a single study. DHCR7, CYP2R1, and the synthesis score were associated with small reductions in 25(OH)D per vitamin D-decreasing allele. However, coefficients for associations with global or memory-related cognitive function were non-significant and in opposing directions for DHCR7 and CYP2R1, with no overall association observed for the synthesis score. Coefficients for the synthesis score and global and memory cognition were similar when stratified by 25(OH)D tertiles, sex and age. We found no evidence for serum 25(OH)D concentration as a causal factor for cognitive performance in mid- to later life.</AbstractText>
</Abstract>
<AuthorList CompleteYN="Y">
<Author ValidYN="Y">
<LastName>Maddock</LastName>
<ForeName>Jane</ForeName>
<Initials>J</Initials>
<AffiliationInfo>
<Affiliation>MRC Lifelong Health and Ageing at UCL, London, United Kingdom. jane.maddock@ucl.ac.uk.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Population, Policy and Practice, UCL Great Ormond Street Institute of Child Health, London, United Kingdom. jane.maddock@ucl.ac.uk.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y">
<LastName>Zhou</LastName>
<ForeName>Ang</ForeName>
<Initials>A</Initials>
<AffiliationInfo>
<Affiliation>Centre for Population Health Research, Sansom Institute, University of South Australia, Adelaide, Australia.</Affiliation>
</AffiliationInfo>
</Author>
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<LastName>Cavadino</LastName>
<ForeName>Alana</ForeName>
<Initials>A</Initials>
<AffiliationInfo>
<Affiliation>Population, Policy and Practice, UCL Great Ormond Street Institute of Child Health, London, United Kingdom.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Wolfson Institute of Preventive Medicine, Queen Mary University of London, London, United Kingdom.</Affiliation>
</AffiliationInfo>
</Author>
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<LastName>Kuźma</LastName>
<ForeName>Elżbieta</ForeName>
<Initials>E</Initials>
<AffiliationInfo>
<Affiliation>University of Exeter Medical School, Exeter, United Kingdom.</Affiliation>
</AffiliationInfo>
</Author>
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<LastName>Bao</LastName>
<ForeName>Yanchun</ForeName>
<Initials>Y</Initials>
<AffiliationInfo>
<Affiliation>Institute for Social and Economic Research (ISER), University of Essex, Colchester, United Kingdom.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y">
<LastName>Smart</LastName>
<ForeName>Melissa C</ForeName>
<Initials>MC</Initials>
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<Affiliation>Institute for Social and Economic Research (ISER), University of Essex, Colchester, United Kingdom.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y">
<LastName>Saum</LastName>
<ForeName>Kai-Uwe</ForeName>
<Initials>KU</Initials>
<AffiliationInfo>
<Affiliation>Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Heidelberg, Germany.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y">
<LastName>Schöttker</LastName>
<ForeName>Ben</ForeName>
<Initials>B</Initials>
<AffiliationInfo>
<Affiliation>Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Heidelberg, Germany.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Network Aging Research (NAR), University of Heidelberg, Heidelberg, Germany.</Affiliation>
</AffiliationInfo>
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