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Caspases01:24

Caspases

Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside cells.

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A Method for Culturing Embryonic C. elegans Cells
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A cell that dies during wild-type C. elegans development can function as a neuron in a ced-3 mutant.

L Avery1, H R Horvitz

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

Cell
|December 24, 1987
PubMed
Summary

Mutations in the C. elegans ced-3 gene prevent cell death, leading to extra cells. In mutants, a related cell sometimes compensates for a lost neuron

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Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Cell Biology

Background:

  • Programmed cell death is crucial for development.
  • Mutations in the C. elegans ced-3 gene abolish most programmed cell deaths.
  • This results in the presence of supernumerary cells in ced-3 mutants.

Purpose of the Study:

  • To investigate the function of supernumerary cells in ced-3 mutants.
  • To explore the compensatory mechanisms for essential neuronal functions.
  • To understand the evolutionary implications of cell lineage plasticity.

Main Methods:

  • Utilized the nematode C. elegans as a model organism.
  • Employing genetic analysis of ced-3 mutants.
  • Functional assays to assess neuronal roles in feeding behavior.

Main Results:

  • The pharyngeal neuron M4 is essential for feeding in wild-type worms.
  • In ced-3 mutants, an extra cell, likely MSpaaaaap, can partially and variably substitute for M4's feeding function.
  • This compensatory function is subnormal and inconsistent.

Conclusions:

  • The variable and suboptimal function of MSpaaaaap suggests its fate may have evolved randomly due to lack of selective pressure.
  • Such cells could play a role in the evolution of cell lineages, similar to pseudogenes in genome evolution.
  • This highlights the potential for non-selected cell fates to contribute to evolutionary novelty.