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Hairpin RNAs and Retrotransposon LTRs Effect RNAi and Chromatin-Based Gene Silencing
Vera Schramke and
Robin Allshire*
The expression of short hairpin RNAs in several organisms silencesgene expression by targeted mRNA degradation. This RNA interference(RNAi) pathway can also affect the genome, as DNA methylationarises at loci homologous to the target RNA in plants. We demonstratein fission yeast that expression of a synthetic hairpin RNAis sufficient to silence the homologous locus in trans and causesthe assembly of a patch of silent Swi6 chromatin with cohesin.This requires components of the RNAi machinery and Clr4 histonemethyltransferase for small interfering RNA generation. A similarprocess represses several meiotic genes through nearby retrotransposonlong terminal repeats (LTRs). These analyses directly implicateinterspersed LTRs in regulating gene expression during cellulardifferentiation.
Wellcome Trust Centre for Cell Biology, Institute of Cell and Molecular Biology, King's Buildings, University of Edinburgh, Edinburgh EH9 3JR, Scotland, UK.
* To whom correspondence should be addressed. E-mail: robin.allshire{at}ed.ac.uk
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