Evidence map›Paper›PMID 16172608›Full record

SynthesisMolecular psychiatry2006

Homocysteine, methylenetetrahydrofolate reductase and risk of schizophrenia: a meta-analysis.

J W Muntjewerff, R S Kahn, H J Blom, M den Heijer

Abstract readComparative StudyMeta-AnalysisReview
PubMed Publisher
In one paragraph

Synthesis in Molecular psychiatry, 2006. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 76 papers, 9 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
76citing papers in PubMed, 9 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

76 citing papers in PubMed, 9 syntheses or guidelines pooled it.

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16 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

J W MuntjewerffGGz Nijmegen, Mental Health Institute Nijmegen, Nijmegen, and Department of Psychiatry, University Medical Center, Utrecht, The Netherlands. jmuntjewerff@ggznijmegen.nl
R S Kahn
H J Blom
M den Heijer

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Elevated plasma homocysteine concentration has been suggested as a risk factor for schizophrenia, but the results of epidemiological studies have been inconsistent. The most extensively studied genetic variant in the homocysteine metabolism is the 677C>T polymorphism in the methylenetetrahydrofolate reductase (MTHFR) gene, resulting in reduced enzyme activity and, subsequently, in elevated homocysteine. A meta-analysis of eight retrospective studies (812 cases and 2113 control subjects) was carried out to examine the association between homocysteine and schizophrenia. In addition, a meta-analysis of 10 studies (2265 cases and 2721 control subjects) on the homozygous (TT) genotype of the MTHFR 677C>T polymorphism was carried out to assess if this association is causal. A 5 micromol/l higher homocysteine level was associated with a 70% (95% confidence interval, CI: 27-129) higher risk of schizophrenia. The TT genotype was associated with a 36% (95% CI: 7-72) higher risk of schizophrenia compared to the CC genotype. The performed meta-analyses showed no evidence of publication bias or excessive influence attributable to any given study. In conclusion, our study provides evidence for an association of homocysteine with schizophrenia. The elevated risk of schizophrenia associated with the homozygous genotype of the MTHFR 677C>T polymorphism provides support for causality between a disturbed homocysteine metabolism and risk of schizophrenia.

Indexed as

Amino Acid SubstitutionCase-Control StudiesGenetic Predisposition to DiseaseHomocysteineHumansMethylenetetrahydrofolate Reductase (NADPH2)Reference ValuesRisk FactorsSchizophreniaHomocysteineMethylenetetrahydrofolate Reductase (NADPH2)

Identifiers

PMID16172608

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.