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Fertil Steril. 2006 Dec;86(6):1716-22. Epub 2006 Oct 30.

Methylenetetrahydrofolate reductase C677T polymorphism and the risk of unexplained recurrent pregnancy loss: a meta-analysis.

Author information

1
Institute of Reproductive and Child Health, Peking University Health Science Center, Beijing, China. renag@sohu.com <renag@sohu.com>

Abstract

OBJECTIVE:

To investigate the association between methylenetetrahydrofolate reductase (MTHFR) C677T polymorphism and the risk of unexplained recurrent pregnancy loss (URPL).

DESIGN:

Meta-analysis of published case-control studies of the MTHFR C677T variant and URPL risk.

SETTING:

A research institution in China.

PATIENT(S):

Women with URPL.

INTERVENTION(S):

None.

MAIN OUTCOME MEASURE(S):

Odds ratios (ORs) and 95% confidence intervals (CIs) for TT versus CC genotype, CT versus CC genotype, TT versus CT and CC genotype combined, and for T versus C allele.

RESULT(S):

Twenty-six studies with 2120 URPL cases and 2949 controls were included. Overall random-effects ORs of 1.49 (95% CI, 1.12-2.00) for TT versus CC genotype, 1.40 (95% CI, 1.11-1.77) for TT versus CT and CC genotype combined, and 1.21 (95%CI, 1.04-1.40) for T versus C allele were found. Stratified analysis showed that significant strong associations between MTHFR C677T polymorphism and URPL were present only in the five Chinese studies (OR = 2.96 for TT versus CC genotype; OR = 2.30 for TT versus CT+CC genotype; OR = 1.73 for T versus C allele), but not in any other studies, including the studies conducted in the European countries.

CONCLUSION(S):

The MTHFR C677T mutation is not a genetic risk factor for URPL except in a Chinese population.

[Indexed for MEDLINE]

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