Protein profile of canine oocytes
Keywords:
in vitro maturation, cell cycle, proteomic, bitchesAbstract
The present study was conducted to characterize the major proteome of canine oocytes. Ovaries were collected from 120 bitches and only Grade 1 COCs were selected for in vitro culture. After in vitro maturation, oocytes were subjected to protein extraction. Proteins were then trypsin-digested and analyzed by tandem mass spectrometry. Thirty-four proteins were identified in the canine oocytes. These proteins have been grouped into three different categories according to their biological, molecular function and cellular localization. With regard to biological process, we found many proteins involved in cell cycle, fertilization, transcription regulation and signaling pathway. The gene ontology analysis also revealed a high percentage of proteins involved in binding activity. Based on protein–protein network analysis using STRING platform, we found that vimentin presents links with CASP3, CASP6, CASP7 and CASP8, which are involved in apoptosis. Complement component C3, interacted with complement receptors, such as CR1 and CR2. Retinol-binding protein 4 interacted with retinol precursors. Actin potentially interacted with cofilin protein 1 and 2. Keratin 10, in turn, had interacted with CDK9, which are involved in pathway signaling. These proteins are essentials for the complete oocyte development and fertilization. In summary, the present study contains the first description of the main protein composition of canine oocytes. Construction of libraries of oocyte proteins, for each especies, will set the foundations for understanding and mapping the crucial events that define oocyte competence.
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