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Updated: Oct 3, 2025

Use of Time-Lapse Microscopy and Stage-Specific Nuclear Depletion of Proteins to Study Meiosis in S. cerevisiae
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Use of Time-Lapse Microscopy and Stage-Specific Nuclear Depletion of Proteins to Study Meiosis in S. cerevisiae

Published on: October 11, 2022

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Release of CHK-2 from PPM-1.D anchorage schedules meiotic entry

Antoine Baudrimont1, Dimitra Paouneskou1, Ariz Mohammad2

  • 1Department of Chromosome Biology, Max Perutz Labs, University of Vienna, Vienna BioCenter, Vienna, Austria.

Science Advances
|February 16, 2022
PubMed

Insights

The phosphatase PPM-1.D regulates entry into meiosis by antagonizing CHK-2 kinase. Its degradation by SCFPROM-1 liberates CHK-2, promoting meiotic entry and preventing germline tumors.

Area of Science:

  • Cell biology
  • Developmental biology
  • Genetics

Background:

  • Meiosis initiation is regulated by multiple redundant posttranscriptional pathways.
  • SCFPROM-1 is one pathway mediating degradation at meiotic entry.
  • Defects in PROM-1 lead to meiotic entry defects and embryonic lethality.

Purpose of the Study:

  • Identify substrates of SCFPROM-1.
  • Elucidate the role of PPM-1.D/Wip1 in meiotic entry.
  • Characterize the PPM-1.D-CHK-2 regulatory axis.

Main Methods:

  • Yeast three-hybrid screening
  • RNA interference (RNAi)
  • Immunofluorescence microscopy
  • Western blotting

Main Results:

  • PPM-1.D/Wip1 identified as a crucial substrate for SCFPROM-1.
  • PPM-1.D antagonizes CHK-2 kinase activity, a key regulator of meiotic prophase I.
  • PPM-1.D uses both catalytic and noncatalytic activities to regulate CHK-2.
  • PPM-1.D sequesters CHK-2 at the nuclear periphery; SCFPROM-1-mediated degradation liberates CHK-2.

Conclusions:

  • PPM-1.D acts as a critical regulator of meiotic entry by controlling CHK-2 levels and localization.
  • SCFPROM-1-mediated degradation of PPM-1.D is essential for timely meiotic entry.
  • This regulatory mechanism ensures proper initiation of meiotic prophase I events.

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