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Programmable artificial RNA condensates in mammalian cells.

Shiyi Li1, Yuna Kim1, Kevin Wang1

  • 1Department of Bioengineering, University of California, Los Angeles; Los Angeles, CA, 90024, USA.

Biorxiv : the Preprint Server for Biology
|February 9, 2026
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Summary
This summary is machine-generated.

Scientists created artificial RNA condensates in cells. These RNA-rich compartments can be programmed to control cellular functions and recruit specific molecules, offering a new tool for biological research.

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Area of Science:

  • Cell biology
  • Molecular biology
  • Biochemistry

Background:

  • Artificial biomolecular condensates are emerging tools for controlling cellular functions.
  • Developing methods to create and control these condensates within living cells is crucial for biological research.

Purpose of the Study:

  • To introduce a novel method for constructing artificial RNA condensates within living mammalian cells.
  • To demonstrate the programmable control over condensate formation, localization, and molecular recruitment.

Main Methods:

  • Designing modular RNA motifs with stem-loop domains that self-condense via loop-loop interactions.
  • Utilizing sequence optimization and diversification to generate distinct, non-mixing condensate populations.
  • Modifying RNA motifs to recruit specific molecules (small molecules, proteins, RNA) and creating multi-compartment droplets.

Main Results:

  • Successfully generated spontaneous RNA-rich compartments in the nucleus and cytoplasm of mammalian cells.
  • Achieved programmable control over condensate localization and the formation of distinct, non-mixing populations.
  • Demonstrated sequence-specific recruitment of molecules and the creation of multi-compartment structures.

Conclusions:

  • The developed RNA motifs provide a versatile platform for building artificial condensates in living cells.
  • These artificial condensates enable the study and manipulation of molecular functions with high spatial and functional control.
  • This technology opens new avenues for synthetic biology and cellular engineering.