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Regulation of Expression at Multiple Steps01:23

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Transcription bodies regulate gene expression by sequestering CDK9.

Martino Ugolini1,2, Maciej A Kerlin1, Ksenia Kuznetsova2

  • 1Center for Integrative Genomics (CIG), University of Lausanne (UNIL), Lausanne, Switzerland.

Nature Cell Biology
|April 8, 2024
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Summary
This summary is machine-generated.

Transcription bodies in zebrafish embryos regulate gene expression by sequestering essential transcription factors like CDK9. Disrupting these bodies causes misregulation of hundreds of genes, highlighting their crucial role in controlling transcription.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Gene Regulation

Background:

  • Transcription occurs in specialized nuclear bodies, but their regulatory role in gene expression is not fully understood.
  • Zygotic transcription in zebrafish embryos initiates at distinct transcription bodies.

Purpose of the Study:

  • To investigate the function of transcription bodies in regulating gene expression.
  • To determine how transcription bodies affect the onset of zygotic transcription in zebrafish.

Main Methods:

  • Disruption of endogenous transcription bodies in zebrafish embryos.
  • Analysis of gene expression using enriched SLAM-seq.
  • Live-cell imaging to observe transcription dynamics.
  • Investigating the role of CDK9 in transcription bodies.

Main Results:

  • Disruption of transcription bodies led to misregulation of hundreds of genes, particularly upregulation of poised genes.
  • Poised genes, despite accessible chromatin, failed to elongate in the presence of intact transcription bodies.
  • Live-cell imaging revealed transcription of poised genes in ectopic bodies upon disruption.
  • CDK9, a key kinase for transcription elongation, was found to be enriched in transcription bodies.
  • Overexpression of CDK9 mimicked the effects of transcription body disruption.

Conclusions:

  • Transcription bodies act as regulatory hubs by sequestering essential transcription machinery, such as CDK9.
  • This sequestration prevents premature or ectopic transcription of poised genes.
  • Transcription bodies play a critical role in controlling the precise timing and location of gene expression during early development.