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Post-transcriptional regulation of gene expression during the programmed death of insect skeletal muscle

P J Cascone1, L M Schwartz

  • 1Biology Department, Morrill Science Center, University of Massachusetts, Amherst, MA 01003, USA.

Development Genes and Evolution
|October 31, 2001
PubMed

Insights

Programmed cell death involves mRNA regulation. Moth muscle cell extracts reveal global mRNA removal before cell death, facilitating new gene expression.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Cell Biology

Background:

  • Programmed cell death (PCD) is crucial for development.
  • Post-transcriptional regulation of mRNA stability and translatability in PCD is understudied.
  • Specific protein roles in PCD are well-documented, but mRNA dynamics are less explored.

Purpose of the Study:

  • To investigate post-transcriptional regulation of mRNA during programmed cell death.
  • To examine developmental changes in mRNA stability and translatability in moth intersegmental muscles (ISMs).
  • To determine if sequence-specific controls influence mRNA function during PCD.

Main Methods:

  • Utilized a cell-free system with protein extracts from Manduca sexta intersegmental muscles (ISMs).
  • Assessed stability and translatability of three representative endogenous mRNAs (actin, polyubiquitin, ubiquitin-fusion 80) and a generic luciferase reporter mRNA.
  • Analyzed changes in mRNA half-life (t1/2) and translational efficiency in extracts from different developmental stages.

Main Results:

  • Polyubiquitin mRNA exhibited the shortest half-life across all tested ISM extracts.
  • mRNA stability and translatability were most significantly impacted in extracts from day 17 ISMs, preceding cell death commitment.
  • Transferring 3' untranslated regions from endogenous mRNAs to luciferase did not alter reporter mRNA stability or translatability.

Conclusions:

  • Suggests a global removal of cellular transcripts occurs just before cell death.
  • This global mRNA turnover facilitates the rapid accumulation of newly expressed mRNAs.
  • Changes in mRNA abundance, translatability, and stability may be key mechanisms for activating cell death and differentiation programs.

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