Protein patterns of pig oocytes during in vitro maturation

Biology of Reproduction
Zdenka EllederovaHana Kovarova

Abstract

In vitro maturation (IVM) of fully grown mammalian oocytes is characterized by initial germinal vesicle (GV) breakdown and rearrangement of microtubule network during the first meiosis (MI), followed by extrusion of the first polar body and block of the oocytes in metaphase of the second meiosis (MII). Only fully matured oocytes are capable of undergoing fertilization and the initiation of zygotic development. These observations are mostly based on morphological evaluation; however, the molecular events responsible for these processes are not known. In this study, we have launched the analysis of pig oocytes during in vitro maturation using a proteomics approach. First, oocyte proteins have been separated by two-dimensional gel electrophoresis and identified by mass spectrometry. Remarkably, several proteins, including peroxiredoxins, ubiquitin carboxyl-terminal hydrolase isozyme L1, and spermine synthase, are even more abundant than actin, usually the most abundant protein in somatic cells. Furthermore, we have initiated comparative analysis of the oocytes at different stages of maturation to characterize candidate proteins, which are differentially expressed during in vitro maturation. To date, we have identified antiquitin (...Continue Reading

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Methods Mentioned

BETA
electrophoresis
ubiquitination

Software Mentioned

PD Quest
MatchSet Tool
ProFound
XMASS
Analysis Set Manager
PDQuest
Sequest
Bruker

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