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Effects of in vitro culture and of nutrition on epigenetic reprogramming in bovine oocytes and embryos

Grant number: 10/07971-3
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): August 01, 2010
Effective date (End): July 31, 2013
Field of knowledge:Agronomical Sciences - Veterinary Medicine - Animal Reproduction
Principal Investigator:Roberto Sartori Filho
Grantee:Allice Rodrigues Ferreira
Host Institution: Faculdade de Medicina Veterinária e Zootecnia (FMVZ). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil


Biotechnology of reproduction have contributed greatly to animal breeding programs and conservation of naturalized breeds in danger of extinction. According to the Annual Report of the IETS "International Embryo Transfer Society" in 2008, Brazil has the largest production of bovine embryos produced in vivo and in vitro in South America despite the large increase achieved with these technologies, their efficiency is still low. In vitro production of embryos, the quality of nutrition and body condition of donor oocytes, manipulation of oocytes and embryos and the environmental conditions in vitro, may affect the efficiency of the technique. A genetic event / physiological vital and specific gamete is an extensive epigenetic reprogramming is why these cells are suitable for fertilization and the formation of a viable embryo. The objective of this project is to test the effect of specific diets on epigenetic pattern in oocytes and embryos. Will be used oocytes and embryos produced in Nellore heifers exposed to different diets. Samples of DNA and RNA will be extracted for assessment of global methylation pattern of DNA methylation pattern in specific genes, quantification of the expression of genes involved in DNA methylation and characterization of the pattern of X chromosome inactivation in vivo under different diets. It is hoped that with better understanding the pattern of epigenetic reprogramming which is an important physiological event that should happen in gametogenesis, and mainly determine the effect of nutrition on these events in cattle. (AU)

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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)
FERREIRA, A. R.; AGUIAR FILHO, L. F. C.; SOUSA, R. V.; SARTORI, R.; FRANCO, M. M.. Characterization of allele-specific expression of the X-linked gene MAO-A in trophectoderm cells of bovine embryos produced by somatic cell nuclear transfer. Genetics and Molecular Research, v. 14, n. 4, p. 12128-12136, . (10/07971-3)
FERREIRA NOCHI, ALLICE R.; VARGAS, LUNA N.; SARTORI, ROBERTO; JUNIOR, ROBERTO G.; ARAUJO, DAVI B.; FIGUEIREDO, RICARDO A.; TOGAWA, ROBERTO C.; COSTA, MARCOS M. C.; GRYNBERG, PRISCILA; MENDONCA, ANELISE S.; et al. Low levels of sulfur and cobalt during the pre- and periconceptional periods affect the oocyte yield of donors and the DNA methylome of preimplantation bovine embryos. JOURNAL OF DEVELOPMENTAL ORIGINS OF HEALTH AND DISEASE, v. 13, n. 2, p. 13-pg., . (10/07971-3)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
FERREIRA, Allice Rodrigues. Efeitos da clonagem na inativação do cromossomo X e da regulação nutricional do metabolismo da metionina na qualidade ovocitária em bovinos. 2013. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Faculdade de Medicina Veterinária e Zootecnia. Botucatu Botucatu.

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