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DDX5 and DDX17 RNA helicases impact gene expression by regulating splicing and 3' end processing. These proteins interact with CTCF to influence chromatin loops, affecting RNA processing and gene regulation.

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Chromatin Dynamics

Background:

  • DDX5 and DDX17 are DEAD-box RNA helicases involved in gene expression.
  • Their precise roles in transcription and splicing are not fully understood.
  • These helicases are crucial for regulating RNA processing events.

Purpose of the Study:

  • To investigate the function of DDX5 and DDX17 in human cells.
  • To elucidate the mechanisms by which these helicases control gene expression.
  • To explore the interplay between RNA helicases, CTCF, and chromatin structure.

Main Methods:

  • Transcriptome analysis of DDX5/DDX17-depleted human cells.
  • In silico analyses and experimental validation in cultured cells.
  • Chromatin immunoprecipitation and gene looping assays.

Main Results:

  • DDX5/DDX17 depletion caused widespread deregulation of splicing and 3' end processing.
  • CTCF binds to DDX5/DDX17-dependent exons, particularly those with high GC content and RNA Polymerase II density.
  • DDX5/DDX17-dependent chromatin loops connect regulated exons to promoters, influencing alternative splicing and polyadenylation.

Conclusions:

  • DDX5 and DDX17, in conjunction with CTCF, regulate gene expression through RNA helicase-dependent chromatin looping.
  • Chromatin folding mediated by DDX5/DDX17 impacts pre-messenger RNA processing.
  • These findings reveal a novel mechanism linking RNA helicases, chromatin organization, and RNA processing.