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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

HDAC inhibition decreases XIST expression on female IVP bovine blastocysts

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Author(s):
Oliveira, Clara Slade [1, 2] ; Saraiva, Naiara Zoccal [1] ; Coelho Cruz, Maria Helena [1] ; Mazeti, Bruna [1] ; Oliveira, Leticia Zoccolaro [1] ; Lopes, Flavia Lombardi [1] ; Garcia, Joaquim Mansano [1]
Total Authors: 7
Affiliation:
[1] Univ Estadual Paulista, Dept Med Vet Prevent & Reprod Anim, Jaboticabal - Brazil
[2] Embrapa Dairy Cattle Res Ctr, Juiz De Fora - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Reproduction; v. 145, n. 1, p. 9-17, JAN 2013.
Web of Science Citations: 13
Abstract

During initial development, both X chromosomes are active in females, and one of them must be silenced at the appropriate time in order to dosage compensate their gene expression levels to male counterparts. Silencing involves epigenetic mechanisms, including histone deacetylation. Major X chromosome inactivation (XCI) in bovine occurs between hatching and implantation, although in vitro culture conditions might disrupt the silencing process, increasing or decreasing X-linked gene expression. In this study, we aimed to address the roles of histone deacetylase inhibition by trichostatin A (TSA) on female preimplantation development. We tested the hypothesis that by enhancing histone acetylation, TSA would increase the percentage of embryos achieving 16-cell stage, reducing percentage of embryos blocked at 8-cell stage, and interfere with XCI in IVF embryos. We noticed that after TSA treatment, acetylation levels in individual blastomeres of 8-16 cell embryos were increased twofold on treated embryos, and the same was detected for blastocysts. Changes among blastomere levels within the same embryo were diminished on TSA group, as low-acetylated blastomeres were no longer detected. The percentage of embryos that reached the 5th cleavage cycle 118 h after IVF, analyzed by Hoechst staining, remained unaltered after TSA treatment. Then, we assessed XIST and G6PD expression in individual female bovine blastocysts by quantitative real-time PCR. Even though G6PD expression remained unaltered after TSA exposure, XIST expression was eightfold decreased, and we also detected a major decrease in the percentage of blastocysts expressing detectable XIST levels after TSA treatment. Based on these results, we conclude that HDAC is involved on XCI process in bovine embryos, and its inhibition might delay X chromosome silencing and attenuate aberrant XIST expression described for IVF embryos. Reproduction (2013) 145 9-17 (AU)

FAPESP's process: 08/58370-0 - Comparison of the epigenetic profile of genes related to murine neural differentiation in cell types obtained from embryonic stem cells differentiated in vitro and in vivo and from internal mass cells of embryos
Grantee:Clara Slade Oliveira
Support Opportunities: Scholarships in Brazil - Doctorate