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RNA‐directed DNA methylation and plant development require an IWR1‐type transcription factor

RNA‐directed DNA methylation and plant development require an IWR1‐type transcription factor RNA‐directed DNA methylation (RdDM) in plants requires two RNA polymerase (Pol) II‐related RNA polymerases, namely Pol IV and Pol V. A genetic screen designed to reveal factors that are important for RdDM in a developmental context in Arabidopsis identified DEFECTIVE IN MERISTEM SILENCING 4 (DMS4). Unlike other mutants defective in RdDM, dms4 mutants have a pleiotropic developmental phenotype. The DMS4 protein is similar to yeast IWR1 (interacts with RNA polymerase II), a conserved putative transcription factor that interacts with Pol II subunits. The DMS4 complementary DNA partly complements the K1 killer toxin hypersensitivity of a yeast iwr1 mutant, suggesting some functional conservation. In the transgenic system studied, mutations in DMS4 directly or indirectly affect Pol IV‐dependent secondary short interfering RNAs, Pol V‐mediated RdDM, Pol V‐dependent synthesis of intergenic non‐coding RNA and expression of many Pol II‐driven genes. These data suggest that DMS4 might be a regulatory factor for several RNA polymerases, thus explaining its diverse roles in the plant. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png EMBO Reports Wiley

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References (25)

Publisher
Wiley
Copyright
Copyright © 2013 Wiley Periodicals, Inc
ISSN
1469-221X
eISSN
1469-3178
DOI
10.1038/embor.2009.246
pmid
20010803
Publisher site
See Article on Publisher Site

Abstract

RNA‐directed DNA methylation (RdDM) in plants requires two RNA polymerase (Pol) II‐related RNA polymerases, namely Pol IV and Pol V. A genetic screen designed to reveal factors that are important for RdDM in a developmental context in Arabidopsis identified DEFECTIVE IN MERISTEM SILENCING 4 (DMS4). Unlike other mutants defective in RdDM, dms4 mutants have a pleiotropic developmental phenotype. The DMS4 protein is similar to yeast IWR1 (interacts with RNA polymerase II), a conserved putative transcription factor that interacts with Pol II subunits. The DMS4 complementary DNA partly complements the K1 killer toxin hypersensitivity of a yeast iwr1 mutant, suggesting some functional conservation. In the transgenic system studied, mutations in DMS4 directly or indirectly affect Pol IV‐dependent secondary short interfering RNAs, Pol V‐mediated RdDM, Pol V‐dependent synthesis of intergenic non‐coding RNA and expression of many Pol II‐driven genes. These data suggest that DMS4 might be a regulatory factor for several RNA polymerases, thus explaining its diverse roles in the plant.

Journal

EMBO ReportsWiley

Published: Jan 1, 2010

Keywords: ; ; ; ;

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