Production of aberrant promoter transcripts contributes to methylation and silencing of unlinked homologous promoters in trans

M. F. Mette, J. Van Der Winden, M. A. Matzke, A. J.M. Matzke*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

186 Scopus citations


Previous work has suggested that de novo methylation of plant nuclear genes can be triggered by an RNA-DNA interaction. To test whether transcription of a promoter would induce de novo methylation and silencing of unlinked genes driven by the same promoter, a chimeric 'gene' consisting of a nopaline synthase promoter (NOSpro) positioned downstream of the cauliflower mosaic virus 35S promoter (35Spro) and flanked at the 3' end by a NOS terminator (NOSter) was constructed and introduced into the genome of a plant that normally expresses an unmethylated NOSpro-neomycinphosphotransferase (nptII) gene. Transformants were tested for kanamycin resistance and NOSpro RNA synthesis. Most produced a full-length polyadenylated NOSpro RNA, which did not induce silencing or methylation at the NOSpro-nptII target gene. One, however, contained truncated non-polyadenylated NOSpro RNA; in this plant, the NOSpro-nptII gene became silenced and methylated in the NOSpro region. Molecular analysis of the NOSpro silencing locus revealed two incomplete copies of the 35Spro-NOSpro gene arranged as an inverted repeat with NOSpro sequences at the center. Reducing NOSpro transcription by crossing a 35Spro-silencing locus partially reactivated nptII gene expression and decreased NOSpro methylation at the target locus, thus implicating aberrant NOSpro RNA in this trans-silencing phenomenon.

Original languageEnglish (US)
Pages (from-to)241-248
Number of pages8
Issue number1
StatePublished - Jan 4 1999
Externally publishedYes


  • Aberrant RNA
  • DNA cytosine methylation
  • Homology-dependent gene silencing
  • Inverted repeats
  • Trans-silencing

ASJC Scopus subject areas

  • General Neuroscience
  • Molecular Biology
  • General Biochemistry, Genetics and Molecular Biology
  • General Immunology and Microbiology


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