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PI4P-mediated solid-like Merlin condensates orchestrate Hippo pathway regulation.

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Solid-like biomolecular condensates, regulated by Merlin, are crucial for cellular processes. This study reveals how Merlin forms these essential structures and how they are controlled.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Biomolecular condensates are increasingly recognized for their roles in cellular functions.
  • While liquid-like condensates are well-studied, the function and regulation of solid-like condensates remain less understood.

Purpose of the Study:

  • To investigate the role and regulation of solid-like biomolecular condensates in cellular physiology.
  • To elucidate the mechanisms governing the formation and disassembly of Merlin-based solid condensates.

Main Methods:

  • Localization studies of the tumor suppressor Merlin in *Drosophila* epithelia.
  • Analysis of Merlin condensation, requiring phosphatidylinositol-4-phosphate (PI4P)-mediated membrane targeting.
  • Investigation of regulatory mechanisms involving Pez and cytoskeletal tension.

Main Results:

  • Merlin forms solid-like condensates at the medial apical cortex, activating Hippo signaling.
  • Merlin condensation is dependent on PI4P and regulated by Pez and cytoskeletal tension.
  • Solid-like material properties are essential for condensate function and stability.

Conclusions:

  • Solid-like condensates play a vital role in normal physiology.
  • Merlin-based solid condensates are regulated by specific molecular cues and physical forces.
  • This work provides insights into the formation and disassembly mechanisms of solid biomolecular condensates.