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RNA ligands generated against complex nuclear targets indicate a role for U1 snRNP in co-ordinating transcription and

H Tian1

  • 1Department of Genetics, Center for Genetic and Cellular Therapies, Duke University Medical Center, Durham, NC 27710, USA. htian@alumnidirector.com

FEBS Letters
|December 14, 2001
PubMed

Insights

Researchers identified RNA ligands that inhibit transcription by RNA polymerase II (pol II). Some ligands mimic pre-mRNA 5'-splice sites, suggesting a link between transcription and splicing via U1 small nuclear ribonucleoprotein particles (snRNP).

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • RNA Biology

Background:

  • Transcription and RNA splicing are fundamental processes in gene expression.
  • RNA polymerase II (pol II) mediates transcription of protein-coding genes.
  • U1 small nuclear ribonucleoprotein particles (snRNP) are key components of the spliceosome.

Purpose of the Study:

  • To identify RNA ligands that modulate RNA polymerase II (pol II)-mediated transcription.
  • To investigate the potential interplay between transcription and RNA splicing machinery.

Main Methods:

  • Generation of RNA ligands against HeLa nuclear extract components.
  • Functional screening of RNA ligands for transcription modulation.
  • Analysis of ligand sequences for functional motifs.
  • Co-immunoprecipitation assays to detect protein interactions.

Main Results:

  • Eight inhibitor RNA ligands were identified.
  • Four of these ligands contained an 11-nucleotide sequence matching eukaryotic pre-mRNA 5"-splice sites.
  • These splice site-mimicking ligands inhibited pre-initiation complex assembly on a promoter.
  • U1 snRNP and pol II were co-immunoprecipitated, even without active transcription.

Conclusions:

  • The 5"-splice site sequence in RNA ligands can inhibit transcription initiation.
  • U1 snRNP may play a role in coordinating transcription and splicing.
  • This suggests a novel regulatory mechanism linking these two essential RNA processing events.

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