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PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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RNA clamping by Vasa assembles a piRNA amplifier complex on transposon transcripts.

Jordi Xiol1, Pietro Spinelli1, Maike A Laussmann2

  • 1European Molecular Biology Laboratory, Grenoble Outstation, University Grenoble Alpes-EMBL-CNRS, 71 avenue des Martyrs, 38042, France; Unit for Virus Host-Cell Interactions, University Grenoble Alpes-EMBL-CNRS, 71 avenue des Martyrs, 38042, France.

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Scientists discovered a transient Amplifier complex crucial for amplifying piRNAs (small RNAs) in insects. This complex, involving Vasa and Piwi proteins, defends genomes against transposons and is vital for fertility, revealing a key mechanism for adaptive immunity.

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Area of Science:

  • Molecular Biology
  • Genetics
  • RNA Biology

Background:

  • Germline-specific Piwi-interacting RNAs (piRNAs) are essential for genome defense against transposons and reproductive success.
  • The ping-pong cycle amplifies piRNAs by linking target RNA slicing to new piRNA biogenesis, a key process for transposon control.

Purpose of the Study:

  • To identify and characterize the molecular machinery responsible for secondary piRNA biogenesis in insect cells.
  • To elucidate the role of the identified complex in the ping-pong amplification cycle and its impact on genome defense and fertility.

Main Methods:

  • Identification and biochemical characterization of the Amplifier complex in insect cells.
  • Analysis of complex composition, including Vasa, Piwi proteins, Qin/Kumo, and piRNA guides.
  • Functional assays in Drosophila to assess the role of Vasa's RNA helicase activity in piRNA biogenesis and fertility.

Main Results:

  • A transient Amplifier complex was identified, nucleated by the Vasa RNA helicase and containing key ping-pong cycle components.
  • Vasa's helicase domain acts as an RNA clamp, anchoring the complex to transposon transcripts.
  • ATP-dependent remodeling by Vasa facilitates precursor piRNA transfer, and its loss leads to sterility in Drosophila.

Conclusions:

  • The Amplifier complex represents a novel molecular entity mediating secondary piRNA biogenesis.
  • Vasa's enzymatic activity is critical for efficient piRNA amplification and maintaining genome integrity.
  • This study reveals the molecular basis of small RNA amplification, providing insights into adaptive immunity against transposons.