title: Effect of follicle size on mRNA expression in cumulus cells and oocytes of Bos indicus: an approach to identify marker genes for developmental competence.
abstract: To identify the genes related to oocyte competence, we quantified transcripts for candidate genes in oocytes (H1Foo, H2A, H3A, GHR, GDF9, BMP15, OOSP1) and cumulus cells (FSHR, EGFR, GHR, PTX3, IGFII) using the follicle size model to select oocytes of better developmental quality. Follicles were dissected and distributed into four groups according to diameter as follows: 1.0-3.0, 3.1-6.0, 6.1-8.0 and >or=8.1 mm. Cumulus-oocyte complexes (COCs) were released, classified morphologically, matured, fertilised and cultured in vitro or denuded for measurement of diameter and determination of gene expression. Denuded germinal vesicle oocytes and their cumulus cells were used for gene expression analysis by reverse transcription-polymerase chain reaction. The blastocyst rate was highest for oocytes recovered from follicles>6 mm in diameter. In the oocyte, expression of the H2A transcript only increased gradually according to follicle size, being greater (P<0.05) in oocytes from follicles>or=8.1 mm in diameter than in oocytes from follicles<6.0 mm in diameter. In cumulus cells, expression of FSHR, EGFR and GHR mRNA increased with follicular size. In conclusion, we confirmed the importance of H2A for developmental competence and identified important genes in cumulus cells that may be associated with oocyte competence.
authors.affiliation: Faculdade de Agronomia e Veterinária, Ciências Animais, Universidade de Brasília, Brasília, DF 70910-970, Brazil.
authors.forename: Ester Siqueira
authors.initials: ES
authors.lastname: Caixeta
authors.forename: Paula
authors.initials: P
authors.lastname: Ripamonte
authors.forename: Maurício Machaim
authors.initials: MM
authors.lastname: Franco
authors.forename: José Buratini
authors.initials: JB
authors.lastname: Junior
authors.forename: Margot Alves Nunes
authors.initials: MA
authors.lastname: Dode
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000166:cytology / Q000378:metabolism; D002417:Cattle / Q000378:metabolism*; D002450:Cell Communication / Q000502:physiology; D002478:Cells, Cultured; D054885:Cumulus Cells / Q000166:cytology / Q000378:metabolism*; D066246:ErbB Receptors / Q000235:genetics / Q000378:metabolism; D005260:Female; D018507:Gene Expression Regulation, Developmental / Q000235:genetics / Q000502:physiology*; D005819:Genetic Markers; D006657:Histones / Q000235:genetics / Q000378:metabolism; D009865:Oocytes / Q000166:cytology / Q000378:metabolism*; D006080:Ovarian Follicle / Q000166:cytology*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism*; D011962:Receptors, FSH / Q000235:genetics / Q000378:metabolism; D011986:Receptors, Somatotropin / Q000235:genetics / Q000378:metabolism
chemical_list: D005819:Genetic Markers; D006657:Histones; D012333:RNA, Messenger; D011962:Receptors, FSH; D011986:Receptors, Somatotropin; D066246:ErbB Receptors