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Yeast Signaling01:28

Yeast Signaling

Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...
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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each containing...
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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

Developmentally programmed nuclear destruction during yeast gametogenesis.

Michael D Eastwood1, Sally W T Cheung, Kwan Yin Lee

  • 1Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada.

Developmental Cell
|June 26, 2012
PubMed
Summary
This summary is machine-generated.

Yeast undergo programmed nuclear destruction during gametogenesis, involving DNA fragmentation and a unique autophagy. This process benefits sibling cells and suggests early evolution of cell death mechanisms.

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Last Updated: May 21, 2026

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

  • Cell Biology
  • Microbiology
  • Genetics

Background:

  • Autophagy is crucial for cellular catabolism and programmed cell death in eukaryotes.
  • While yeast autophagy is well-studied, its role in cell death pathways remains less understood.
  • Programmed cell death (PCD) mechanisms are diverse and have evolved across different life forms.

Purpose of the Study:

  • To investigate programmed cell death events during yeast gametogenesis.
  • To characterize the mechanisms and significance of nuclear destruction in yeast.
  • To explore the evolutionary origins of cell death pathways.

Main Methods:

  • Observation of nuclear destruction during yeast gametogenesis.
  • Analysis of DNA fragmentation patterns.
  • Characterization of autophagic processes involved in cell death.
  • Comparison with mammalian and plant cell death pathways.

Main Results:

  • Widespread developmentally programmed nuclear destruction (PND) occurs during yeast gametogenesis.
  • PND involves apoptotic-like DNA fragmentation and a novel form of autophagy.
  • This yeast autophagy resembles mammalian lysosomal membrane permeabilization and plant mega-autophagy.
  • Gametogenic PND benefits sibling cells in undomesticated yeast strains.

Conclusions:

  • Programmed nuclear destruction is a significant event during yeast gametogenesis.
  • Yeast utilize a unique autophagic mechanism for cell death, converging diverse PCD-related processes.
  • Gametogenesis in microbes may represent an evolutionary stage for programmed cell death mechanisms.
  • This study reveals conserved and divergent aspects of cell death pathways across eukaryotes.