Integrated pararetroviral sequences define a unique class of dispersed repetitive DNA in plants

J. Jakowitsch, 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

101 Scopus citations


Although integration of viral DNA into host chromosomes occurs regularly in bacteria and animals, there are few reported cases in plants, and these involve insertion at only one or a few sites. Here, we report that pararetrovirus-like sequences have integrated repeatedly into tobacco chromosomes, attaining a copy number of ≃103. Insertion apparently occurred by illegitimate recombination. From the sequences of 22 independent insertions recovered from a healthy plant, an 8-kilobase genome encoding a previously uncharacterized pararetrovirus that does not contain an integrase function could be assembled. Preferred boundaries of the viral inserts may correspond to recombinogenic gaps in open circular viral DNA. An unusual feature of the integrated viral sequences is a variable tandem repeat cluster, which might reflect defective genomes that preferentially recombine into plant DNA. The recurrent invasion of pararetroviral DNA into tobacco chromosomes demonstrates that viral sequences can contribute significantly to plant genome evolution.

Original languageEnglish (US)
Pages (from-to)13241-13246
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number23
StatePublished - Nov 9 1999
Externally publishedYes

ASJC Scopus subject areas

  • General


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