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Related Experiment Videos

Gene activation is required for developmentally programmed cell death.

L M Schwartz1, L Kosz, B K Kay

  • 1Department of Zoology, University of Massachusetts, Amherst 01003.

Proceedings of the National Academy of Sciences of the United States of America
|September 1, 1990
PubMed
Summary
This summary is machine-generated.

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Programmed cell death in tobacco hawkmoth muscles is triggered by falling ecdysteroid hormone levels. Gene activation, not reduced synthesis, drives this insect muscle degeneration pathway.

Area of Science:

  • Developmental Biology
  • Insect Physiology
  • Molecular Biology

Background:

  • Intersegmental muscles in the tobacco hawkmoth (Manduca sexta) undergo programmed cell death post-metamorphosis.
  • This degeneration process is initiated by a decline in the ecdysteroid hormone titer.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying ecdysteroid-induced programmed cell death in Manduca sexta intersegmental muscles.
  • To identify specific genes involved in the commitment and execution of muscle cell death.

Main Methods:

  • Analysis of gene expression patterns during muscle degeneration.
  • Manipulation of ecdysteroid levels and gene expression using 20-hydroxyecdysone and actinomycin D injections.
  • Isolation of cDNA clones for genes upregulated during degeneration.

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Main Results:

  • Muscle degeneration is linked to a fall in ecdysteroid titer.
  • Selective gene repression and activation are crucial for degeneration commitment.
  • Altering gene expression patterns prevents muscle persistence.
  • Four genes showing abundant expression during degeneration commitment were identified.

Conclusions:

  • Programmed cell death in these muscles is an active, genetically regulated process.
  • Degeneration results from the activation of a specific differentiative pathway, not a general cessation of macromolecular synthesis.