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Article
Slicing and Binding by Ago3 or Aub Trigger Piwi-Bound piRNA Production by Distinct Mechanisms
Program in Bioinformatics and Integrative Biology Publications and Presentations
  • Wei Wang, University of Massachusetts Medical School
  • Bo W. Han, University of Massachusetts Medical School
  • Cindy Tipping, University of Massachusetts Medical School
  • Daniel Tianfang Ge, University of Massachusetts Medical School
  • Zhao Zhang, University of Massachusetts Medical School
  • Zhiping Weng, University of Massachusetts Medical School
  • Phillip D. Zamore, University of Massachusetts Medical School
UMMS Affiliation
Program in Bioinformatics and Integrative Biology; Department of Biochemistry and Molecular Pharmacology; RNA Therapeutics Institute
Date
9-3-2015
Document Type
Article
Medical Subject Headings
Active Transport, Cell Nucleus; Animals; Argonaute Proteins; DNA Transposable Elements; Drosophila Proteins; Drosophila melanogaster; Female; Gene Silencing; Genes, Insect; Models, Biological; Mutation; Ovum; Peptide Initiation Factors; Protein Binding; RNA Cleavage; RNA, Small Interfering
Abstract
In Drosophila ovarian germ cells, PIWI-interacting RNAs (piRNAs) direct Aubergine and Argonaute3 to cleave transposon transcripts and instruct Piwi to repress transposon transcription, thereby safeguarding the germline genome. Here, we report that RNA cleavage by Argonaute3 initiates production of most Piwi-bound piRNAs. We find that the cardinal function of Argonaute3, whose piRNA guides predominantly correspond to sense transposon sequences, is to produce antisense piRNAs that direct transcriptional silencing by Piwi, rather than to make piRNAs that guide post-transcriptional silencing by Aubergine. We also find that the Tudor domain protein Qin prevents Aubergine's cleavage products from becoming Piwi-bound piRNAs, ensuring that antisense piRNAs guide Piwi. Although Argonaute3 slicing is required to efficiently trigger phased piRNA production, an alternative, slicing-independent pathway suffices to generate Piwi-bound piRNAs that repress transcription of a subset of transposon families. This alternative pathway may help flies silence newly acquired transposons for which they lack extensively complementary piRNAs.
Rights and Permissions
Citation: Mol Cell. 2015 Sep 3;59(5):819-30. doi: 10.1016/j.molcel.2015.08.007. Link to article on publisher's site
Related Resources
Link to Article in PubMed
PubMed ID
26340424
Citation Information
Wei Wang, Bo W. Han, Cindy Tipping, Daniel Tianfang Ge, et al.. "Slicing and Binding by Ago3 or Aub Trigger Piwi-Bound piRNA Production by Distinct Mechanisms" Vol. 59 Iss. 5 (2015) ISSN: 1097-2765 (Linking)
Available at: http://works.bepress.com/zhao-zhang/19/