Proteomic profiling of murine oocyte maturation
Alejandra M Vitale1, Meredith E Kennedy Calvert, Mallika Mallavarapu
1Weill Medical College of Cornell University, New York, New York 10021, USA. amv2003@med.cornell.edu
Molecular Reproduction and Development
|October 18, 2006
Summary
Researchers identified 12 differentially expressed proteins during mouse oocyte maturation using 2D electrophoresis and mass spectrometry. Nucleoplasmin 2 (NPM2) showed significant changes, including post-translational modification and altered localization during development.
Area of Science:
- Reproductive Biology
- Molecular Biology
- Proteomics
Background:
- Oocyte maturation is a critical process for female fertility.
- Understanding protein dynamics during oocyte maturation is essential for reproductive science.
Purpose of the Study:
- To identify proteins with altered expression during murine oocyte maturation.
- To investigate the role and modifications of Nucleoplasmin 2 (NPM2) during oocyte maturation and early embryonic development.
Main Methods:
- Two-dimensional (2D) electrophoresis and mass spectrometry for protein identification.
- Real-Time RT-PCR for mRNA expression analysis.
- Indirect immunofluorescence and Western blot for protein localization and modification analysis.
Main Results:
- 12 proteins were found to be differentially expressed between germinal vesicle (GV) and metaphase II (MII) oocytes.
- Nucleoplasmin 2 (NPM2) exhibited a post-translational modification (electrophoretic mobility shift) during the GV to MII transition.
- NPM2 mRNA levels decreased post-fertilization, and its nuclear localization was observed in oocytes and preimplantation embryos.
Conclusions:
- Protein expression profiles change significantly during oocyte maturation.
- Nucleoplasmin 2 (NPM2) undergoes dynamic post-translational modifications and localization changes critical for oocyte and embryo development.
