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Mol Cell. 2012 Sep 28;47(6):954-69. doi: 10.1016/j.molcel.2012.07.021. Epub 2012 Aug 16.

The cochaperone shutdown defines a group of biogenesis factors essential for all piRNA populations in Drosophila.

Author information

1
Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Dr. Bohrgasse 3, 1030 Vienna, Austria.

Abstract

In animal gonads, PIWI proteins and their bound 23-30 nt piRNAs guard genome integrity by the sequence specific silencing of transposons. Two branches of piRNA biogenesis, namely primary processing and ping-pong amplification, have been proposed. Despite an overall conceptual understanding of piRNA biogenesis, identity and/or function of the involved players are largely unknown. Here, we demonstrate an essential role for the female sterility gene shutdown in piRNA biology. Shutdown, an evolutionarily conserved cochaperone collaborates with Hsp90 during piRNA biogenesis, potentially at the loading step of RNAs into PIWI proteins. We demonstrate that Shutdown is essential for both primary and secondary piRNA populations in Drosophila. An extension of our study to previously described piRNA pathway members revealed three distinct groups of biogenesis factors. Together with data on how PIWI proteins are wired into primary and secondary processing, we propose a unified model for piRNA biogenesis.

PMID:
22902557
PMCID:
PMC3463805
DOI:
10.1016/j.molcel.2012.07.021
[Indexed for MEDLINE]
Free PMC Article

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