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Active RNA synthesis patterns nuclear condensates.

Salman F Banani1,2,3, Andriy Goychuk4, Pradeep Natarajan5

  • 1Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA.

Biorxiv : the Preprint Server for Biology
|November 5, 2024
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Summary
This summary is machine-generated.

Active RNA synthesis drives non-equilibrium states that control biomolecular condensate patterning. This study reveals how RNA influences the size, number, and spacing of cellular condensates, impacting biological function.

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Area of Science:

  • Cellular biochemistry
  • Molecular biology
  • Biophysics

Background:

  • Biomolecular condensates are essential membraneless organelles organizing cellular processes.
  • Mechanisms of condensate formation and dissolution are known, but patterning principles (size, number, spacing) are unclear.
  • RNA is a key regulator of condensate dynamics.

Purpose of the Study:

  • To investigate the role of RNA in regulating biomolecular condensate patterning.
  • To elucidate the physical principles governing condensate patterning within cells.
  • To link condensate patterning to specific biological functions.

Main Methods:

  • Utilized nucleolar fibrillar centers (FCs) as a model system for condensate patterning.
  • Inhibited ribosomal RNA synthesis to observe effects on FC patterning.
  • Applied physical theory and experimental observations to model condensate behavior.
  • Manipulated TCOF1 expression to assess the impact on FC condensate patterning and function.

Main Results:

  • Inhibition of ribosomal RNA synthesis significantly altered FC patterning.
  • Active RNA synthesis was shown to generate non-equilibrium states that arrest condensate coarsening.
  • A model was developed, supported by theory and experiments, explaining RNA's role in patterning.
  • Altering FC condensate patterning via TCOF1 expression impaired ribosomal RNA processing.

Conclusions:

  • Active RNA synthesis is crucial for establishing non-equilibrium conditions that regulate biomolecular condensate patterning.
  • Condensate patterning is not solely determined by equilibrium thermodynamics but by active cellular processes.
  • The study links the physical patterning of condensates to their biological function, specifically in RNA processing.
  • Findings provide insights into how cells control the spatial organization of biochemical reactions.