PuSH - Publication Server of Helmholtz Zentrum München: Homocysteine and coronary heart disease: Meta-analysis of <em>MTHFR</em> case-control studies, avoiding publication bias.

Navigation

Home

Deutsch

Research

Advanced Search

Browse by ...

... Journal

... Publication Type

... Research Data

... Publication Year

Publication overview

Support & Contact

Contact persons

Help

Data protection

Clarke, R.* ; Bennett, D.A.* ; Parish, S.* ; Verhoef, P.* ; Dötsch-Klerk, M.* ; Lathrop, M* ; Xu, P.* ; Nørdestgaard, B.G.* ; Holm, H.* ; Hopewell, J.C.* ; Saleheen, D.* ; Tanaka, T.* ; Anand, S.S.* ; Chambers, J.C.* ; Kleber, M.E.* ; Ouwehand, W.H.* ; Yamada, Y.* ; Elbers, C.* ; Peters, B.* ; Stewart, A.F.* ; Reilly, M.M.* ; Thorand, B. ; Yusuf, S.* ; Engert, J.C.* ; Assimes, T.L.* ; Kooner, J.* ; Danesh, J.* ; Watkins, H.* ; Samani, N.J.* ; Collins, R.* ; Peto, R* ; MTHFR Studies Collaborative Group (*)

Homocysteine and coronary heart disease: Meta-analysis of MTHFR case-control studies, avoiding publication bias.

PLoS Med. 9:e1001177 (2012)

Publ. Version/Full Text Volltext

DOI

PMC

	Open Access Gold

Abstract
Metrics
Extra information

BACKGROUND: Moderately elevated blood levels of homocysteine are weakly correlated with coronary heart disease (CHD) risk, but causality remains uncertain. When folate levels are low, the TT genotype of the common C677T polymorphism (rs1801133) of the methylene tetrahydrofolate reductase gene (MTHFR) appreciably increases homocysteine levels, so "Mendelian randomization" studies using this variant as an instrumental variable could help test causality. METHODS AND FINDINGS: Nineteen unpublished datasets were obtained (total 48,175 CHD cases and 67,961 controls) in which multiple genetic variants had been measured, including MTHFR C677T. These datasets did not include measurements of blood homocysteine, but homocysteine levels would be expected to be about 20% higher with TT than with CC genotype in the populations studied. In meta-analyses of these unpublished datasets, the case-control CHD odds ratio (OR) and 95% CI comparing TT versus CC homozygotes was 1.02 (0.98-1.07; p = 0.28) overall, and 1.01 (0.95-1.07) in unsupplemented low-folate populations. By contrast, in a slightly updated meta-analysis of the 86 published studies (28,617 CHD cases and 41,857 controls), the OR was 1.15 (1.09-1.21), significantly discrepant (p = 0.001) with the OR in the unpublished datasets. Within the meta-analysis of published studies, the OR was 1.12 (1.04-1.21) in the 14 larger studies (those with variance of log OR<0.05; total 13,119 cases) and 1.18 (1.09-1.28) in the 72 smaller ones (total 15,498 cases). CONCLUSIONS: The CI for the overall result from large unpublished datasets shows lifelong moderate homocysteine elevation has little or no effect on CHD. The discrepant overall result from previously published studies reflects publication bias or methodological problems.

Altmetric

Additional Metrics?

[➜Log in]

Edit extra informations Login

Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Methylenetetrahydrofolate reductase gene; Placebo-controlled trial; Cardiovascular-disease; Mendelian randomization; Myocardial-infarction; Vascular-disease; Common mutation; B vitamins; Folic-acid; Ethnic-groups

ISSN (print) / ISBN 1549-1277

e-ISSN 1549-1676

Journal PLoS Medicine

Quellenangaben Volume: 9, Issue: 2, Article Number: e1001177

Publisher Public Library of Science (PLoS)

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Epidemiology II (EPI2)