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Related Experiment Videos

Regulation of pre-mRNA processing by src

H Neel1, P Gondran, D Weil

  • 1Laboratoire de Génétique Oncologique, CNRS URA 1967, Institut Gustave Roussy, Villejuif, France.

Current Biology : CB
|April 1, 1995
PubMed
Summary
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External signals regulate gene expression post-transcriptionally. The Src protein influences RNA processing, affecting splicing and export of transcripts, revealing nuclear control mechanisms.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Gene Regulation

Background:

  • Gene expression is crucial for eukaryotic cell function, regulated by transcriptional and post-transcriptional mechanisms.
  • While transcriptional control is well-studied, nuclear pre-mRNA processing's role in gene regulation remains less understood.
  • Existing knowledge of pre-mRNA processing is largely indirect, inferred from transcription rates versus mRNA accumulation.

Purpose of the Study:

  • To investigate the influence of signal transduction proteins on pre-mRNA processing.
  • To model pre-mRNA processing using the tumour necrosis factor beta (TNF beta) gene.
  • To determine if signal transduction pathways regulate gene expression at the nuclear level.

Main Methods:

  • Utilized a co-transfection approach with the murine TNF beta gene as a reporter.

Related Experiment Videos

  • Investigated the effects of overproducing activated ras and src genes on TNF beta transcript processing.
  • Analyzed effects on both TNF beta and beta globin expression vectors.

    • Main Results:

    • Activated ras and src genes increased RNA accumulation in nuclear and cytoplasmic compartments.
    • Only src activation modified TNF beta pre-mRNA processing.
    • Src demonstrated two distinct effects: slowing splicing and enabling export of partially spliced transcripts.

    Conclusions:

    • The Src protein regulates TNF beta and beta globin transcript processing via signal transduction.
    • External signals can control gene expression post-transcriptionally within the nucleus.
    • Src likely modulates general splicing/mRNA transport, targeting genes with competing pathways or critical splicing kinetics.