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Mouse Oocyte Microinjection, Maturation and Ploidy Assessment
07:03

Mouse Oocyte Microinjection, Maturation and Ploidy Assessment

Published on: July 23, 2011

Dicer is a key player in oocyte maturation

Hung-Ching Liu1, YaXu Tang, Zhiying He

  • 1Department of Reproductive Medicine, Weill Medical College of Cornell University, New York, NY 10021, USA. hcliu@med.cornell.edu

Journal of Assisted Reproduction and Genetics
|September 10, 2010
PubMed
Abstract

Insights

Dicer siRNA significantly impairs oocyte maturation by disrupting spindle formation and chromosomal organization. This highlights the critical roles of Dicer and microRNA in successful meiosis.

Area of Science:

  • Reproductive Biology
  • Molecular Genetics

Background:

  • Dicer and microRNAs (miRNAs) are crucial for gene regulation.
  • Their specific roles in mammalian oogenesis require further elucidation.

Purpose of the Study:

  • To investigate the function of Dicer and miRNAs during mouse oogenesis using Dicer siRNA.
  • To determine the impact of Dicer depletion on oocyte maturation and meiotic processes.

Main Methods:

  • Mouse oocytes were treated with Dicer siRNA or control siRNA.
  • In vitro maturation (IVM) followed by analysis of maturation rates, spindle/chromosomal organization, and gene expression.

Main Results:

  • Dicer siRNA significantly reduced oocyte maturation rates.
  • Abnormal spindle and chromosomal organization were observed.
  • Transcripts for Dicer, miRNAs, spindle proteins (PLK1, AURKA), and checkpoints (BUB1, BUB1B) were reduced.
  • Depletion of BUB1B specifically impaired polar body extrusion and increased chromosomal/spindle abnormalities.

Conclusions:

  • Dicer siRNA initiates a cascade affecting gene expression from Dicer to miRNAs, spindle proteins, and checkpoints.
  • This cascade leads to aberrant spindle and chromosomal organization.
  • Dicer and miRNAs are essential for oogenesis and successful meiotic completion.

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