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Arginine methylation promotes siRNA-binding specificity for a spermatogenesis-specific isoform of the Argonaute protein CSR-1.

Dieu An H Nguyen | Carolyn M Phillips
Nature communications | 2021

CSR-1 is an essential Argonaute protein that binds to a subclass of 22G-RNAs targeting most germline-expressed genes. Here we show that the two isoforms of CSR-1 have distinct expression patterns; CSR-1B is ubiquitously expressed throughout the germline and during all stages of development while CSR-1A expression is restricted to germ cells undergoing spermatogenesis. Furthermore, CSR-1A associates preferentially with 22G-RNAs mapping to spermatogenesis-specific genes whereas CSR-1B-bound small RNAs map predominantly to oogenesis-specific genes. Interestingly, the exon unique to CSR-1A contains multiple dimethylarginine modifications, which are necessary for the preferential binding of CSR-1A to spermatogenesis-specific 22G-RNAs. Thus, we have discovered a regulatory mechanism for C. elegans Argonaute proteins that allows for specificity of small RNA binding between similar Argonaute proteins with overlapping temporal and spatial localization.

Pubmed ID: 34244496

Associated grants

  • Agency: NIH HHS, United States
    Id: P40 OD010440
  • Agency: NCI NIH HHS, United States
    Id: K22 CA177897
  • Agency: NCI NIH HHS, United States
    Id: P30 CA014089
  • Agency: NIGMS NIH HHS, United States
    Id: R35 GM119656
  • Agency: NIGMS NIH HHS, United States
    Id: T32 GM118289

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