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GLH/VASA helicases promote germ granule formation to ensure the fidelity of piRNA-mediated transcriptome surveillance

Author

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  • Wenjun Chen

    (University of Chicago
    Third Affiliated Hospital of Sun Yat-Sen University)

  • Jordan S. Brown

    (University of Chicago)

  • Tao He

    (Huazhong University of Science and Technology)

  • Wei-Sheng Wu

    (National Cheng Kung University)

  • Shikui Tu

    (Shanghai Jiao Tong University)

  • Zhiping Weng

    (University of Mass. Chan Medical School)

  • Donglei Zhang

    (Huazhong University of Science and Technology)

  • Heng-Chi Lee

    (University of Chicago)

Abstract

piRNAs function as guardians of the genome by silencing non-self nucleic acids and transposable elements in animals. Many piRNA factors are enriched in perinuclear germ granules, but whether their localization is required for piRNA biogenesis or function is not known. Here we show that GLH/VASA helicase mutants exhibit defects in forming perinuclear condensates containing PIWI and other small RNA cofactors. These mutant animals produce largely normal levels of piRNA but are defective in triggering piRNA silencing. Strikingly, while many piRNA targets are activated in GLH mutants, we observe that hundreds of endogenous genes are aberrantly silenced by piRNAs. This defect in self versus non-self recognition is also observed in other mutants where perinuclear germ granules are disrupted. Together, our results argue that perinuclear germ granules function critically to promote the fidelity of piRNA-based transcriptome surveillance in C. elegans and preserve self versus non-self distinction.

Suggested Citation

  • Wenjun Chen & Jordan S. Brown & Tao He & Wei-Sheng Wu & Shikui Tu & Zhiping Weng & Donglei Zhang & Heng-Chi Lee, 2022. "GLH/VASA helicases promote germ granule formation to ensure the fidelity of piRNA-mediated transcriptome surveillance," Nature Communications, Nature, vol. 13(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32880-2
    DOI: 10.1038/s41467-022-32880-2
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    References listed on IDEAS

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