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    Science. 2010 Jan 1;327(5961):94-7. Epub 2009 Dec 3.

    Targeted 3' processing of antisense transcripts triggers Arabidopsis FLC chromatin silencing.

    Liu F, Marquardt S, Lister C, Swiezewski S, Dean C.

    Source

    Department of Cell and Developmental Biology, John Innes Centre, Norwich NR4 7UH, UK.

    Abstract

    Noncoding RNA is emerging as an important regulator of gene expression in many organisms. We are characterizing RNA-mediated chromatin silencing of the Arabidopsis major floral repressor gene, FLC. Through suppressor mutagenesis, we identify a requirement for CstF64 and CstF77, two conserved RNA 3'-end-processing factors, in FLC silencing. However, FLC sense transcript 3' processing is not affected in the mutants. Instead, CstF64 and CstF77 are required for 3' processing of FLC antisense transcripts. A specific RNA-binding protein directs their activity to a proximal antisense polyadenylation site. This targeted processing triggers localized histone demethylase activity and results in reduced FLC sense transcription. Targeted 3' processing of antisense transcripts may be a common mechanism triggering transcriptional silencing of the corresponding sense gene.

    PMID:
    19965720
    [PubMed - indexed for MEDLINE]
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