Limits...
Strong association of 677 C>T substitution in the MTHFR gene with male infertility--a study on an indian population and a meta-analysis.

Gupta N, Gupta S, Dama M, David A, Khanna G, Khanna A, Rajender S - PLoS ONE (2011)

Bottom Line: Methylenetetrahydrofolate reductase (MTHFR) is an important enzyme of folate and methionine metabolism, making it crucial for DNA synthesis and methylation.Meta-analysis was performed using Comprehensive Meta-analysis software (Version 2).The overall summary estimate (OR) for allele and genotype meta-analysis were 1.304 (p = 0.000), 1.310 (p = 0.000), respectively, establishing significant association of 677C>T polymorphism with male infertility. 677C>T substitution associated strongly with male infertility in Indian population.

View Article: PubMed Central - PubMed

Affiliation: Division of Endocrinology, Central Drug Research Institute (Council of Scientific and Industrial Research), Lucknow, Uttar Pradesh, India.

ABSTRACT

Background: Methylenetetrahydrofolate reductase (MTHFR) is an important enzyme of folate and methionine metabolism, making it crucial for DNA synthesis and methylation. The objective of this study was to analyze MTHFR gene 677C>T polymorphism in infertile male individuals from North India, followed by a meta-analysis on our data and published studies.

Methodology/principal findings: We undertook genotyping on a total of 837 individuals including well characterized infertile (N = 522) and confirmed fertile (N = 315) individuals. The SNP was typed by direct DNA sequencing. Chi square test was done for statistical analysis. Published studies were searched using appropriate keywords. Source of data collection for meta-analysis included 'Pubmed', 'Ovid' and 'Google Scholar'. Those studies analyzing 677C>T polymorphism in male infertility and presenting all relevant data were included in meta-analysis. The genotype data for infertile subjects and fertile controls was extracted from each study. Chi square test was done to obtain odds ratio (OR) and p-value. Meta-analysis was performed using Comprehensive Meta-analysis software (Version 2). The frequency of mutant (T) allele (p = 0.0025) and genotypes (CT+TT) (p = 0.0187) was significantly higher in infertile individuals in comparison to fertile controls in our case-control study. The overall summary estimate (OR) for allele and genotype meta-analysis were 1.304 (p = 0.000), 1.310 (p = 0.000), respectively, establishing significant association of 677C>T polymorphism with male infertility.

Conclusions/significance: 677C>T substitution associated strongly with male infertility in Indian population. Allele and genotype meta-analysis also supported its strong correlation with male infertility, thus establishing it as a risk factor.

Show MeSH

Related in: MedlinePlus

Publication bias (Genotype meta-analysis).Funnel plot of standard error by log odds ratio using fixed model for observed set of studies (a) and after imputation (b). Funnel plot of precision by log odds ratio using fixed model for observed set of studies (c) and after imputation (d). Funnel plot of standard error by log odds ratio using random effect model for observed set of studies (e) and after imputation (f). Funnel plot of precision by log odds ratio using random effect model for observed set of studies (g) and after imputation (h).
© Copyright Policy
Related In: Results  -  Collection


getmorefigures.php?uid=PMC3140509&req=5

pone-0022277-g007: Publication bias (Genotype meta-analysis).Funnel plot of standard error by log odds ratio using fixed model for observed set of studies (a) and after imputation (b). Funnel plot of precision by log odds ratio using fixed model for observed set of studies (c) and after imputation (d). Funnel plot of standard error by log odds ratio using random effect model for observed set of studies (e) and after imputation (f). Funnel plot of precision by log odds ratio using random effect model for observed set of studies (g) and after imputation (h).

Mentions: We generated funnel plots using standard error and precision values for allele (Figure 6a–h) and genotypes (Figure 7a–h) using both fixed and random effect models. Apart from observed sets of studies, the plots were also drawn after imputation. Symmetrical distribution of studies in the funnel plots suggests absence of publication bias. This is also supported by other tests described below.


Strong association of 677 C>T substitution in the MTHFR gene with male infertility--a study on an indian population and a meta-analysis.

Gupta N, Gupta S, Dama M, David A, Khanna G, Khanna A, Rajender S - PLoS ONE (2011)

Publication bias (Genotype meta-analysis).Funnel plot of standard error by log odds ratio using fixed model for observed set of studies (a) and after imputation (b). Funnel plot of precision by log odds ratio using fixed model for observed set of studies (c) and after imputation (d). Funnel plot of standard error by log odds ratio using random effect model for observed set of studies (e) and after imputation (f). Funnel plot of precision by log odds ratio using random effect model for observed set of studies (g) and after imputation (h).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3140509&req=5

pone-0022277-g007: Publication bias (Genotype meta-analysis).Funnel plot of standard error by log odds ratio using fixed model for observed set of studies (a) and after imputation (b). Funnel plot of precision by log odds ratio using fixed model for observed set of studies (c) and after imputation (d). Funnel plot of standard error by log odds ratio using random effect model for observed set of studies (e) and after imputation (f). Funnel plot of precision by log odds ratio using random effect model for observed set of studies (g) and after imputation (h).
Mentions: We generated funnel plots using standard error and precision values for allele (Figure 6a–h) and genotypes (Figure 7a–h) using both fixed and random effect models. Apart from observed sets of studies, the plots were also drawn after imputation. Symmetrical distribution of studies in the funnel plots suggests absence of publication bias. This is also supported by other tests described below.

Bottom Line: Methylenetetrahydrofolate reductase (MTHFR) is an important enzyme of folate and methionine metabolism, making it crucial for DNA synthesis and methylation.Meta-analysis was performed using Comprehensive Meta-analysis software (Version 2).The overall summary estimate (OR) for allele and genotype meta-analysis were 1.304 (p = 0.000), 1.310 (p = 0.000), respectively, establishing significant association of 677C>T polymorphism with male infertility. 677C>T substitution associated strongly with male infertility in Indian population.

View Article: PubMed Central - PubMed

Affiliation: Division of Endocrinology, Central Drug Research Institute (Council of Scientific and Industrial Research), Lucknow, Uttar Pradesh, India.

ABSTRACT

Background: Methylenetetrahydrofolate reductase (MTHFR) is an important enzyme of folate and methionine metabolism, making it crucial for DNA synthesis and methylation. The objective of this study was to analyze MTHFR gene 677C>T polymorphism in infertile male individuals from North India, followed by a meta-analysis on our data and published studies.

Methodology/principal findings: We undertook genotyping on a total of 837 individuals including well characterized infertile (N = 522) and confirmed fertile (N = 315) individuals. The SNP was typed by direct DNA sequencing. Chi square test was done for statistical analysis. Published studies were searched using appropriate keywords. Source of data collection for meta-analysis included 'Pubmed', 'Ovid' and 'Google Scholar'. Those studies analyzing 677C>T polymorphism in male infertility and presenting all relevant data were included in meta-analysis. The genotype data for infertile subjects and fertile controls was extracted from each study. Chi square test was done to obtain odds ratio (OR) and p-value. Meta-analysis was performed using Comprehensive Meta-analysis software (Version 2). The frequency of mutant (T) allele (p = 0.0025) and genotypes (CT+TT) (p = 0.0187) was significantly higher in infertile individuals in comparison to fertile controls in our case-control study. The overall summary estimate (OR) for allele and genotype meta-analysis were 1.304 (p = 0.000), 1.310 (p = 0.000), respectively, establishing significant association of 677C>T polymorphism with male infertility.

Conclusions/significance: 677C>T substitution associated strongly with male infertility in Indian population. Allele and genotype meta-analysis also supported its strong correlation with male infertility, thus establishing it as a risk factor.

Show MeSH
Related in: MedlinePlus