The Drosophila hairpin RNA pathway generates endogenous short interfering RNAs.

Abstract:

:In contrast to microRNAs and Piwi-associated RNAs, short interfering RNAs (siRNAs) are seemingly dispensable for host-directed gene regulation in Drosophila. This notion is based on the fact that mutants lacking the core siRNA-generating enzyme Dicer-2 or the predominant siRNA effector Argonaute 2 are viable, fertile and of relatively normal morphology. Moreover, endogenous Drosophila siRNAs have not yet been identified. Here we report that siRNAs derived from long hairpin RNA genes (hpRNAs) programme Slicer complexes that can repress endogenous target transcripts. The Drosophila hpRNA pathway is a hybrid mechanism that combines canonical RNA interference factors (Dicer-2, Hen1 (known as CG12367) and Argonaute 2) with a canonical microRNA factor (Loquacious) to generate approximately 21-nucleotide siRNAs. These novel regulatory RNAs reveal unexpected complexity in the sorting of small RNAs, and open a window onto the biological usage of endogenous RNA interference in Drosophila.

journal_name

Nature

journal_title

Nature

authors

Okamura K,Chung WJ,Ruby JG,Guo H,Bartel DP,Lai EC

doi

10.1038/nature07015

subject

Has Abstract

pub_date

2008-06-05 00:00:00

pages

803-6

issue

7196

eissn

0028-0836

issn

1476-4687

pii

nature07015

journal_volume

453

pub_type

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