title: Aberrant DNA methylation reprogramming in bovine SCNT preimplantation embryos.
abstract: DNA methylation reprogramming plays important roles in mammalian embryogenesis. Mammalian somatic cell nuclear transfer (SCNT) embryos with reprogramming defects fail to develop. Thus, we compared DNA methylation reprogramming in preimplantation embryos from bovine SCNT and in vitro fertilization (IVF) and analyzed the influence of vitamin C (VC) on the reprogramming of DNA methylation. The results showed that global DNA methylation followed a typical pattern of demethylation and remethylation in IVF preimplantation embryos; however, the global genome remained hypermethylated in SCNT preimplantation embryos. Compared with the IVF group, locus DNA methylation reprogramming showed three patterns in the SCNT group. First, some pluripotency genes (POU5F1 and NANOG) and repeated elements (satellite I and α-satellite) showed insufficient demethylation and hypermethylation in the SCNT group. Second, a differentially methylated region (DMR) of an imprint control region (ICR) in H19 exhibited excessive demethylation and hypomethylation. Third, some pluripotency genes (CDX2 and SOX2) were hypomethylated in both the IVF and SCNT groups. Additionally, VC improved the DNA methylation reprogramming of satellite I, α-satellite and H19 but not that of POU5F1 and NANOG in SCNT preimplantation embryos. These results indicate that DNA methylation reprogramming was aberrant and that VC influenced DNA methylation reprogramming in SCNT embryos in a locus-specific manner.
authors.affiliation: State &Local Joint Engineering Laboratory for Animal Models of Human Diseases, Academy of Translational Medicine, First Hospital, Jilin University, Changchun, Jilin 130061, China.|College of Animal Science and Veterinary Medicine, Jilin University, Changchun, Jilin 130062, China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Air Force General Hospital of PLA, Beijing 100037, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Chen
authors.affiliation: College of Animal Science and Veterinary Medicine, Jilin University, Changchun, Jilin 130062, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Wang
authors.affiliation: College of Animal Science and Veterinary Medicine, Jilin University, Changchun, Jilin 130062, China.
authors.forename: Xinglan
authors.initials: X
authors.lastname: An
authors.affiliation: College of Animal Science and Veterinary Medicine, Jilin University, Changchun, Jilin 130062, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Tang
authors.affiliation: College of Animal Science and Veterinary Medicine, Jilin University, Changchun, Jilin 130062, China.
authors.forename: Xueming
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State &Local Joint Engineering Laboratory for Animal Models of Human Diseases, Academy of Translational Medicine, First Hospital, Jilin University, Changchun, Jilin 130061, China.
authors.forename: Liguang
authors.initials: L
authors.lastname: Sun
authors.affiliation: State &Local Joint Engineering Laboratory for Animal Models of Human Diseases, Academy of Translational Medicine, First Hospital, Jilin University, Changchun, Jilin 130061, China.
authors.forename: Ziyi
authors.initials: Z
authors.lastname: Li
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000494:pharmacology; D001755:Blastocyst / Q000187:drug effects / Q000378:metabolism*; D000071616:CDX2 Transcription Factor / Q000235:genetics; D002417:Cattle / Q000235:genetics; D065150:Cellular Reprogramming; D019175:DNA Methylation; D005260:Female; D005307:Fertilization in Vitro / Q000009:adverse effects / Q000662:veterinary; D008297:Male; D000071317:Nanog Homeobox Protein / Q000235:genetics; D053652:Nuclear Transfer Techniques / Q000009:adverse effects / Q000662:veterinary; D050814:Octamer Transcription Factor-3 / Q000235:genetics; D055748:SOXB1 Transcription Factors / Q000235:genetics; D014815:Vitamins / Q000494:pharmacology
chemical_list: D000071616:CDX2 Transcription Factor; D000071317:Nanog Homeobox Protein; D050814:Octamer Transcription Factor-3; D055748:SOXB1 Transcription Factors; D014815:Vitamins; D001205:Ascorbic Acid