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Condensate cooperativity underlies transgenerational gene silencing.

Zhenzhen Du1, Kun Shi1, Jordan S Brown2

  • 1Department of Biochemistry and Molecular Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430032, China.

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Summary

Cooperation between germ granules and P bodies is essential for heritable gene silencing across generations in C. elegans. This condensate interaction ensures the transmission of gene silencing memory through small RNAs.

Keywords:
ArgonauteCGH-1CP: GenomicsCP: Molecular biologyP bodyPIWIcondensategerm cellsgerm granulephase separationsmall RNAtransgenerational inheritance

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Biomolecular condensates are known to interact in vivo, but the functional significance of these interactions remains largely unexplored.
  • Understanding condensate interactions is crucial for deciphering complex cellular processes.

Purpose of the Study:

  • To investigate the functional significance of interactions between germ granules and P bodies in C. elegans.
  • To determine the role of condensate cooperativity in transgenerational gene silencing.

Main Methods:

  • Microscopy to observe condensate localization and organization.
  • Genetic analysis of P body mutants (e.g., cgh-1) to assess gene silencing propagation.
  • Analysis of small RNA amplification and Argonaute protein stability.

Main Results:

  • P bodies coat perinuclear germ granules, and specific P body components (CGH-1/DDX6, CAR-1/LSM14) are vital for germ granule organization and small RNA factor concentration.
  • While initial gene silencing occurs in P body mutants, transgenerational silencing fails due to impaired secondary small RNA amplification and reduced WAGO-4 Argonaute stability.
  • Condensate cooperation is critical for establishing heritable gene silencing memory.

Conclusions:

  • The functional cooperativity between germ granules and P bodies is indispensable for transgenerational gene silencing in C. elegans.
  • This interaction enables the establishment and maintenance of heritable gene silencing memory via small RNA pathways.
  • Condensate interactions can lead to emergent cellular capabilities, such as heritable memory formation.