Journal
MOLECULAR CELL
Volume 59, Issue 2, Pages 229-242Publisher
CELL PRESS
DOI: 10.1016/j.molcel.2015.05.024
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Funding
- Austrian Academy of Sciences
- European Community (ERC) [204986]
- Austrian Science Fund [P26032-B22, F4307-B09]
- Naito Foundation
- EMBO
- European Research Council (ERC) [204986] Funding Source: European Research Council (ERC)
- Austrian Science Fund (FWF) [P 26032] Funding Source: researchfish
- Austrian Science Fund (FWF) [W1207, P26032] Funding Source: Austrian Science Fund (FWF)
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SmallRNAs are usedto silence transposable elements (TEs) in many eukaryotes, which use diverse evolutionary solutions to identify TEs. In ciliated protozoans, small-RNA-mediated comparison of the germline and somatic genomes underlies identification of TE-related sequences, which are then eliminated fromthe soma. Here, we describe an additionalmechanism of small-RNA-mediated identification of TErelated sequences in the ciliate Tetrahymena. We show that a limited set of internal eliminated sequences (IESs) containing potentially active TEs produces a class of small RNAs that recognize not only the IESs from which they are derived, but also other IESs in trans. This trans recognition triggers the expression of yet another class of small RNAs that identify other IESs. Therefore, TE-related sequences in Tetrahymena are robustly targeted for elimination by a genome-wide trans-recognition network accompanied by a chain reaction of small RNA production.
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