title: Methylenetetrahydrofolate reductase C677T and A1298C variants do not affect ongoing pregnancy rates following IVF.
abstract: BACKGROUND
  There is concern that IVF could compromise normal imprinting and methylation of DNA. Methylenetetrahydrofolate reductase (MTHFR) regulates the flow of folic acid-derived, one-carbon moieties for methylation and is critical to early embryonic development. Therefore, we hypothesized that common polymorphisms in MTHFR could associate with IVF outcome.
  
  
  METHODS
  MTHFR C677T and A1298C polymorphism genotyping was performed on 374 subjects for this study, representing 197 couples undergoing IVF in a university setting from July 2005 to January 2006. Analysis of variance (ANOVA), chi-square and/or multivariate analyses were used to assess whether these polymorphisms are associated with embryo quality or with ongoing pregnancy or spontaneous abortion rates.
  
  
  RESULTS
  Allele frequencies for C677T ( p=0.67, q=0.33) and A1298C ( p=0.71, q=0.29) were in Hardy-Weinberg equilibrium. The C677T and A1298C variants, either alone or in combination, did not associate with embryo quality or short-term pregnancy outcome.
  
  
  CONCLUSIONS
  The common polymorphisms in MTHFR are not associated with embryo quality, as defined by cell number or fragmentation score, or with short-term pregnancy outcomes. Therefore, in our population in which women receive adequate folic acid, MTHFR genotypes are not informative in explaining IVF failure. Further studies, however, examining birth outcomes and the other enzymes in the folic acid pathway are warranted.
authors.affiliation: Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, CA 94143, USA. dobsona@obgyn.ucsf.edu
authors.forename: A T
authors.initials: AT
authors.lastname: Dobson
authors.forename: R M
authors.initials: RM
authors.lastname: Davis
authors.forename: M P
authors.initials: MP
authors.lastname: Rosen
authors.forename: S
authors.initials: S
authors.lastname: Shen
authors.forename: P F
authors.initials: PF
authors.lastname: Rinaudo
authors.forename: J
authors.initials: J
authors.lastname: Chan
authors.forename: M I
authors.initials: MI
authors.lastname: Cedars
mesh_terms: D000328:Adult; D001755:Blastocyst / Q000201:enzymology; D015331:Cohort Studies; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D008297:Male; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D011247:Pregnancy; D018873:Pregnancy Rate
chemical_list: D042965:Methylenetetrahydrofolate Reductase (NADPH2)