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MEI-1/MEI-2 katanin-like microtubule severing activity is required for Caenorhabditis elegans meiosis

M Srayko1, D W Buster, O A Bazirgan

  • 1Department of Biochemistry, Development Research Group, University of Calgary, Calgary, Alberta, T2N 4N1 Canada.

Genes & Development
|May 16, 2000
PubMed

Insights

The Caenorhabditis elegans mei-1 and mei-2 genes are crucial for meiotic spindle organization. These genes encode proteins that function as a complex to sever microtubules, essential for proper meiotic spindle formation.

Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • The Caenorhabditis elegans meiotic spindle differs morphologically from the mitotic spindle.
  • The mei-1 and mei-2 genes are essential for meiotic spindle formation but not for mitotic spindle function.

Purpose of the Study:

  • To investigate the function of the mei-1 and mei-2 genes in C. elegans meiotic spindle organization.
  • To determine if MEI-1 and MEI-2 proteins form a complex and exhibit microtubule-severing activity.

Main Methods:

  • Gene analysis and protein similarity comparisons to known microtubule-severing proteins (katanin).
  • Antibody staining to determine the subcellular localization of MEI-1 and MEI-2.
  • Co-immunoprecipitation assays in HeLa cells to assess protein association.
  • Microtubule disassembly assays upon co-expression in HeLa cells.

Main Results:

  • MEI-1 shares similarity with the catalytic subunit (p60) and MEI-2 with the targeting subunit (p80) of katanin.
  • MEI-1 and MEI-2 localize to the polar ends of meiotic spindle microtubules and meiotic chromatin.
  • MEI-1 and MEI-2 physically associate and their localization is interdependent.
  • Co-expression of MEI-1 and MEI-2 leads to microtubule disassembly.

Conclusions:

  • The MEI-1 and MEI-2 proteins function as a complex in C. elegans.
  • This MEI-1/MEI-2 complex possesses microtubule-severing activity.
  • Microtubule-severing activity mediated by MEI-1/MEI-2 is essential for meiotic spindle organization in C. elegans.

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