Influence of the 5-hydroxymethylcytosine on Nuclear Reprogramming of Bovines

• Grant number: 13/07160-3
• Support Opportunities: Scholarships in Brazil - Doctorate
• Effective date (Start): July 01, 2013
• Effective date (End): February 28, 2015
• Field of knowledge: Agronomical Sciences - Veterinary Medicine - Animal Reproduction
• Principal Investigator: Flávio Vieira Meirelles
• Grantee: Rafael Vilar Sampaio
• Host Institution: Faculdade de Zootecnia e Engenharia de Alimentos (FZEA). Universidade de São Paulo (USP). Pirassununga , SP, Brazil

Abstract

The nuclear reprogramming of somatic cell to an embryonic state has several applications, such as basic research in developmental biology, cell therapy in medicine, genetic improvement of livestock animals and species conservation. The two principal techniques used to achieve nuclear reprogramming are Somatic Cell Nuclear Transfer (SCNT) and Induced Pluripotent Stem Cell (iPS). There are many studies reporting the low efficiency of these techniques. Several researchers have shown that epigenetic modifications, such as DNA methylation and Histone methylation and acetylation, are the main barrier to an efficient reprogramming. Recently, it was described a new kind of epigenetic modification, 5-hydroxymethylcytosine (5hmC), this modification is related to active demethylation of DNA, and it offers a new approach to understand the the mechanisms underlying the nuclear reprograming process. Thus, the aim of this project is investigate the influence of 5hmC on nuclear reprogramming, as well as use new strategies to improve SCNT and iPS efficiency. For this reason, we will analyze the epigenetic patterns (principal markers: 5mC, 5hmC, H3K9ac and H3K9me2) of cells with different states of cellular differentiation (i.e mesenchymal stem cells vs fibroblasts) and we will use them as nuclear donors in SCNT. Moreover, to further investigate the DNA oxidation through 5hmC mechanism. To this end, we will treat different cell lineages with a chromatin-modifying agent (BIX-01294) to use them in nuclear transfer and induction pluripotency experiments. Therefore, we will test whether or not if the levels of oxidised DNA are correlated to the ability of the cells to undergo a complete nuclear reprograming, by global DNA demethylation.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SAMPAIO, RAFAEL VILAR; SANGALLI, JULIANO RODRIGUES; CAMARA DE BEM, TIAGO HENRIQUE; AMBRIZI, DEWISON RICARDO; DEL COLLADO, MAITE; BRIDI, ALESSANDRA; CAVALCANTE MENDES DE AVILA, ANA CLARA FAQUINELI; MACABELLI, CAROLINA HABERMANN; OLIVEIRA, LILIAN DE JESUS; DA SILVEIRA, JULIANO COELHO; et al. Catalytic inhibition of H3K9me2 writers disturbs epigenetic marks during bovine nuclear reprogramming. SCIENTIFIC REPORTS, v. 10, n. 1, JUL 13 2020. (15/08807-6, 14/22887-0, 13/08135-2, 14/50947-7, 14/21034-3, 15/25111-5, 12/50533-2, 13/07160-3)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

SAMPAIO, Rafael Vilar. Epigenetic modifications of chromatin and their relation with the nuclear reprogramming of bovine. 2015. Doctoral Thesis - Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD) Pirassununga.