ilencing mark H3K27me3 is differently reprogrammed in bovine embryos with distinct kinetics of developmen

Author(s)

Ispada, Jessica ^{[1, 2]} ; Milazzotto, Marcella Pecora ^{[1, 2]}

Affiliation

^[1] Fed Univ ABC, Ctr Nat & Human Sci, Lab Cellular & Mol Biol, Santo Andre, SP - Brazil

^[2] Univ Sao Paulo, Inst Biomed Sci, Butanta - Brazil

• Document type: Journal article
• Source: REPRODUCTION IN DOMESTIC ANIMALS; v. 57, n. 3 DEC 2021.
• Web of Science Citations: 0

Abstract

The kinetics of the first cleavages is a predictor of blastocyst development and implantation. For bovine embryos, this attribute was previously related to distinct metabolic, molecular and epigenetic profiles, including DNA and histone modifications. In the present work, we described the dynamics of trimethylation of lysine 27 on histone H3 (H3K27me3) in fast and slow developing embryos and verified if this epigenetic mark was also influenced by the speed of the first cleavages. In vitro-produced bovine embryos were classified as fast (4 or more cells) or slow (2 cells) at 40 hr post fertilization (hpf) and either collected or cultured until 96 hpf or 186 hpf. Immunofluorescence analysis was performed in these three time points and showed that although both groups presented the same levels of H3K27me3 at 40 hpf, slow embryos presented a pronounced increase in this mark at 186 hpf when compared to fast embryos, resulting in blastocysts with remarkable differences in H3K27me3 levels. In conclusion, the increased levels of this repressive histone post-translation modification (PTM) might be an attempt of slow embryos to promote gene expression control and chromatin integrity, since it was already reported that these embryos present reduced levels of other epigenetic repressive marks as DNA methylation and trimethylation of lysine 9 on histone H3 (H3K9me3). (AU)

• FAPESP's process: 18/11668-6 - Metaboloepigenetics: Interrelationships between energetic metabolism and DNA methylation in bovine embryos
• Grantee: Jéssica Ispada
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 15/03381-0 - CELLULAR STRESS AND ITS RELATION WITH THE KINECTICS OF IN VITRO PRODUCED BOVINE EMBRYOS
• Grantee: Marcella Pecora Milazzotto
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/25982-7 - Metabolic regulation of DNA methylation: new routes, new targets
• Grantee: Marcella Pecora Milazzotto
• Support Opportunities: Regular Research Grants