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Casein kinase II promotes piRNA production through direct phosphorylation of USTC component TOFU-4

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  • Gangming Zhang

    (University of Massachusetts Chan Medical School)

  • Chunwei Zheng

    (University of Massachusetts Chan Medical School)

  • Yue-he Ding

    (University of Massachusetts Chan Medical School)

  • Craig Mello

    (University of Massachusetts Chan Medical School
    Howard Hughes Medical Institute)

Abstract

Piwi-interacting RNAs (piRNAs) are genomically encoded small RNAs that engage Piwi Argonaute proteins to direct mRNA surveillance and transposon silencing. Despite advances in understanding piRNA pathways and functions, how the production of piRNA is regulated remains elusive. Here, using a genetic screen, we identify casein kinase II (CK2) as a factor required for piRNA pathway function. We show that CK2 is required for the localization of PRG-1 and for the proper localization of several factors that comprise the ‘upstream sequence transcription complex’ (USTC), which is required for piRNA transcription. Loss of CK2 impairs piRNA levels suggesting that CK2 promotes USTC function. We identify the USTC component twenty-one-U fouled-up 4 (TOFU-4) as a direct substrate for CK2. Our findings suggest that phosphorylation of TOFU-4 by CK2 promotes the assembly of USTC and piRNA transcription. Notably, during the aging process, CK2 activity declines, resulting in the disassembly of USTC, decreased piRNA production, and defects in piRNA-mediated gene silencing, including transposons silencing. These findings highlight the significance of posttranslational modification in regulating piRNA biogenesis and its implications for the aging process. Overall, our study provides compelling evidence for the involvement of a posttranslational modification mechanism in the regulation of piRNA biogenesis.

Suggested Citation

  • Gangming Zhang & Chunwei Zheng & Yue-he Ding & Craig Mello, 2024. "Casein kinase II promotes piRNA production through direct phosphorylation of USTC component TOFU-4," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46882-9
    DOI: 10.1038/s41467-024-46882-9
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    References listed on IDEAS

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