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Coiled bodies without coilin

D W Bauer1, J G Gall

  • 1Department of Embryology, Carnegie Institution, Baltimore, Maryland 21210, USA.

Molecular Biology of the Cell
|January 1, 1997
PubMed
Summary
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Coilin is not essential for coiled body formation in Xenopus egg extracts, suggesting these structures are heterogeneous and may compartmentalize RNA processing pathways.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • RNA Biology

Background:

  • Coiled bodies are nuclear organelles involved in RNA processing.
  • SPH-1 (p80-coilin) is a characteristic protein of coiled bodies.
  • Coiled bodies contain components from pre-mRNA splicing, pre-rRNA processing, and histone pre-mRNA 3'-end formation.

Purpose of the Study:

  • To investigate the essentiality of coilin for coiled body structure and function.
  • To determine the role of coilin and Sm proteins in coiled body assembly.
  • To explore the structural heterogeneity of coiled bodies.

Main Methods:

  • In vitro assembly of nuclei in Xenopus egg extract.
  • Immunodepletion of coilin and Sm proteins from egg extract.
  • Immunofluorescence microscopy to visualize coiled bodies and their components.

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Main Results:

  • Nuclei formed in coilin-depleted extract contained morphologically normal coiled bodies lacking coilin.
  • These coilin-depleted bodies failed to stain for Sm proteins, despite Sm proteins being present in the extract.
  • Coiled bodies formed in Sm-depleted extract showed reduced coilin and Sm staining but retained nucleolar proteins (fibrillarin, nucleolin).
  • Coilin and Sm proteins show interdependence but are not essential for nucleolar component assembly in coiled bodies.

Conclusions:

  • Coilin is not essential for the structural assembly of coiled bodies.
  • Coiled bodies are structurally heterogeneous organelles.
  • Different RNA processing pathways may reside in distinct compartments within coiled bodies.