SynthesisPloS one2015
MTHFR 677C>T polymorphism increases the male infertility risk: a meta-analysis involving 26 studies.
Synthesis in PloS one, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 36 papers, 10 of them syntheses that pooled it.
What it found
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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.
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.
Who cites it
36 citing papers in PubMed, 10 syntheses or guidelines pooled it, 61 citations in OpenAlex.
- Methylenetetrahydrofolate reductase C677T and A1298C polymorphisms and male infertility risk: An updated meta-analysis.Medicine · 2020Pooled it
- Association of the MTHFR 677C>T and 1298A>C polymorphisms and male infertility risk: a meta-analysis.Reproductive biology and endocrinology : RB&E · 2020Pooled it
- Association between apolipoprotein B XbaI polymorphisms and coronary heart disease: A meta-analysis.BMC cardiovascular disorders · 2020Pooled it
- Pooled it
- The SPO11-C631T gene polymorphism and male infertility risk: a meta-analysis.Renal failure · 2017Pooled it
- Association between MTHFR A1298C polymorphism and male infertility: A meta-analysis.Journal of Huazhong University of Science and Technology. Medical sciences = Hua zhong ke ji da xue xue bao. Yi xue Ying De wen ban = Huazhong keji daxue xuebao. Yixue Yingdewen ban · 2017Pooled it
- MTHFR C677T, A1298C and MS A2756G Gene Polymorphisms and Male Infertility Risk in a Chinese Population: A Meta-Analysis.PloS one · 2017Pooled it
- Association between apolipoprotein B EcoRI polymorphisms and coronary heart disease : A meta-analysis.Wiener klinische Wochenschrift · 2016Pooled it
- Association Between Apolipoprotein B XbaI Polymorphism and Coronary Heart Disease in Han Chinese Population: A Meta-Analysis.Genetic testing and molecular biomarkers · 2016Pooled it
- Pooled it
- MTHFR Gene Polymorphisms: A Single Gene with Wide-Ranging Clinical Implications-A Review.Genes · 2025Review
- Evaluation of Risk Factors and a Gene Panel as a Tool for Unexplained Infertility Diagnosis by Next-Generation Sequencing.Medicina (Kaunas, Lithuania) · 2025Review
- Sperm DNA methylation defects in a new mouse model of the 5,10-methylenetetrahydrofolate reductase 677C>T variant and correction with moderate dose folic acid supplementation.Molecular human reproduction · 2024Article
- Exploring the correlation between homocysteine, red blood cell folate and MTHFRC677T genotypes with female infertility.Biomarkers in medicine · 2024Article
- Higher incidence of embryonic defects in mouse offspring conceived with assisted reproduction from fathers with sperm epimutations.Human molecular genetics · 2023Article
- Hyperhomocysteinemia in hypofertile male patients can be alleviated by supplementation with 5MTHF associated with one carbon cycle support.Frontiers in reproductive health · 2023Article
- T677T Methylenetetrahydrofolate Reductase Single Nucleotide Polymorphisms Increased Prevalence in a Subgroup of Infertile Patients with Endometriosis.Journal of women's health (2002) · 2022Article
- Article
- Dietary Intake and Genetic Background Influence Vitamin Needs during Pregnancy.Healthcare (Basel, Switzerland) · 2022Review
- Folic Acid, Folinic Acid, 5 Methyl TetraHydroFolate Supplementation for Mutations That Affect Epigenesis through the Folate and One-Carbon Cycles.Biomolecules · 2022Review
Corrections and comments
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Authors and funding
9 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
BACKGROUND AND
objectivesMethylenetetrahydrofolate reductase (MTHFR) polymorphism may be a risk factor for male infertility. However, the epidemiologic studies showed inconsistent results regarding MTHFR polymorphism and the risk of male infertility. Therefore, we performed a meta-analysis of published case-control studies to re-examine the controversy.
methodsElectronic searches of PubMed, EMBASE, Google Scholar and China National Knowledge Infrastructure (CNKI) were conducted to select eligible literatures for this meta-analysis (updated to June 19, 2014). According to our inclusion criteria and the Newcastle-Ottawa Scale (NOS), only high quality studies that observed the association between MTHFR polymorphism and male infertility risk were included. Crude odds ratio (OR) with 95% confidence interval (CI) was used to assess the strength of association between the MTHFR polymorphism and male infertility risk.
resultsTwenty-six studies involving 5,575 cases and 5,447 controls were recruited. Overall, MTHFR 677C>T polymorphism showed significant associations with male infertility risk in both fixed effects (CT+TT vs. CC: OR = 1.34, 95% CI: 1.23-1.46) and random effects models (CT+TT vs. CC: OR = 1.39, 95% CI: 1.19-1.62). Further, when stratified by ethnicity, sperm concentration and control sources, the similar results were observed in Asians, Caucasians, Azoo or OAT subgroup and both in population-based and hospital-based controls. Nevertheless, no significant association was only observed in oligo subgroup.
conclusionsOur results indicated that the MTHFR polymorphism is associated with an increased risk of male infertility. Further well-designed analytical studies are necessary to confirm our conclusions and evaluate gene-environment interactions with male infertility risk.
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What Socratic holds
Registered trials
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 Socratic graph.