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Plant Cell, Vol. 11, 2291-2302, December 1999, Copyright © 1999, American Society of Plant Physiologists

RNA–DNA Interactions and DNA Methylation in Post-Transcriptional Gene Silencing

Louise Jonesa, Andrew J. Hamiltona, Olivier Voinneta, Carole L. Thomasb, Andrew J. Mauleb, and David C. Baulcombea
a Sainsbury Laboratory, John Innes Centre, Colney Lane, Norwich NR4 7UH, United Kingdom
b Department of Virus Research, John Innes Centre, Colney Lane, Norwich NR4 7UH, United Kingdom

Correspondence to: David C. Baulcombe, baulcombe{at}bbsrc.ac.uk (E-mail), 44-1603-250024 (fax)

Post-transcriptional gene silencing (PTGS) is a homology-dependent process that reduces cytoplasmic RNA levels. In several experimental systems, there is also an association of PTGS with methylation of DNA. To investigate this association, we used plants carrying a transgene encoding the green fluorescent protein (GFP). Gene silencing was induced using potato virus X RNA vectors carrying parts of the coding sequence or the promoter of the GFP transgene. In each instance, homology-based, RNA-directed methylation was associated with silencing. When the GFP-transcribed region was targeted, PTGS affected both transgene and viral RNA levels. When methylation was targeted to a promoter region, transgene RNA levels were reduced; however, viral RNA levels were unaffected. For comparison, we induced PTGS of the gene encoding the endogenous ribulose-1,5-bisphosphate carboxylase oxygenase (Rubisco) small subunit (rbcS) by inoculation with potato virus X–rbcS. In this example, no methylation of the rbcS DNA was associated with the reduction in rbcS transcript levels, and viral RNA levels were unaffected. Finally, we investigated DNA methylation by using GFP-transformed plants in which PTGS was induced by localized introduction of a T-DNA carrying GFP sequences. In these plants, there was methylation of a GFP transgene associated with systemic spread of a gene-silencing signal from the infiltrated part of the plant. This transgene methylation was not affected when systemic PTGS was blocked by suppressors of silencing encoded by potato virus Y and cucumber mosaic virus. Combined, these data support an epigenetic model of PTGS in which transgene methylation is associated with an RNA–DNA interaction that ensures that PTGS is maintained.




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