Systematic identification of germ granule proteins reveals specialized roles in RNAi and small RNA inheritance.

Identification of novel germ granule proteins reveals their essential roles in RNAi and small RNA inheritance in Caenorhabditis elegans, with PINT-1 being crucial for siRNA biogenesis.

• Why it matters: Understanding germ granule composition and function is vital for elucidating mechanisms of fertility and transgenerational genome regulation, yet many proteins involved remain unknown.
• What they did: Using TurboID proximity labeling, mass spectrometry, genetic screening, CRISPR tagging, and small RNA sequencing, the study identified new germ granule proteins and their roles in small RNA pathways, analyzing 21 mutants.
• The result: Findings demonstrate that these proteins, including PINT-1, are integral to small RNA biogenesis and inheritance, with PINT-1 coevolving with PRG-1, highlighting their evolutionary and functional significance.