title: Responses of bovine early embryos to S-adenosyl methionine supplementation in culture.
abstract: There is a growing concern about the potential adverse effects of high dose folic acid (FA) supplementation before and during pregnancy. FA metabolism generates S-adenosyl methionine (SAM) which is an important cofactor of epigenetic programming. We sought to assess the impact of a large dose of SAM on early embryo development.
  
  
  
  In vitro cultured bovine embryos were treated with SAM from the eight-cell stage to the blastocyst stage. In addition to the phenotype, the genome-wide epigenetic and transcription profiles were analyzed.
  
  
  
  Treatment significantly improved embryo hatching and caused a shift in sex ratio in favor of males. SAM caused genome-wide hypermethylation mainly in exonic regions and in CpG islands. Although differentially expressed genes were associated with response to nutrients and developmental processes, no correspondence was found with the differentially methylated regions, suggesting that cellular responses to SAM treatment during early embryo development may not require DNA methylation-driven changes.
  
  
  
  Since bovine embryos were not indifferent to SAM, effects of large-dose FA supplements on early embryonic development in humans cannot be ruled out.
authors.affiliation: Centre de recherche en Reproduction, Développement et Santé Intergénérationnelle (CRDSI), Département des sciences animales, Institut sur la nutrition et les aliments fonctionnels, Université Laval, Québec, QC, G1V 0A6, Canada.
authors.forename: Habib A
authors.initials: HA
authors.lastname: Shojaei Saadi
authors.affiliation: Centre de recherche en Reproduction, Développement et Santé Intergénérationnelle (CRDSI), Département des sciences animales, Institut sur la nutrition et les aliments fonctionnels, Université Laval, Québec, QC, G1V 0A6, Canada.
authors.forename: Dominic
authors.initials: D
authors.lastname: Gagné
authors.affiliation: Centre de recherche en Reproduction, Développement et Santé Intergénérationnelle (CRDSI), Département des sciences animales, Institut sur la nutrition et les aliments fonctionnels, Université Laval, Québec, QC, G1V 0A6, Canada.
authors.forename: Éric
authors.initials: É
authors.lastname: Fournier
authors.affiliation: Centre de recherche en Reproduction, Développement et Santé Intergénérationnelle (CRDSI), Département des sciences animales, Institut sur la nutrition et les aliments fonctionnels, Université Laval, Québec, QC, G1V 0A6, Canada.
authors.forename: Luis Manuel
authors.initials: LM
authors.lastname: Baldoceda Baldeon
authors.affiliation: Centre de recherche en Reproduction, Développement et Santé Intergénérationnelle (CRDSI), Département des sciences animales, Institut sur la nutrition et les aliments fonctionnels, Université Laval, Québec, QC, G1V 0A6, Canada.
authors.forename: Marc-André
authors.initials: MA
authors.lastname: Sirard
authors.affiliation: Centre de recherche en Reproduction, Développement et Santé Intergénérationnelle (CRDSI), Département des sciences animales, Institut sur la nutrition et les aliments fonctionnels, Université Laval, Québec, QC, G1V 0A6, Canada.
authors.forename: Claude
authors.initials: C
authors.lastname: Robert
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000187:drug effects*; D002417:Cattle; D018899:CpG Islands; D019175:DNA Methylation; D044127:Epigenesis, Genetic; D005260:Female; D008297:Male; D012436:S-Adenosylmethionine / Q000009:adverse effects / Q000494:pharmacology*; D012744:Sex Ratio
chemical_list: D012436:S-Adenosylmethionine
keywords: CpG enrichment; DNA methylation; S-adenosyl methionine; SAM; bovine early embryo; epigenome; sex ratio; transcriptome