title: Retrotransposon replication in plants.
abstract: Retrotransposons comprise the bulk of large plant genomes, replicating via an RNA intermediate whereby the original, integrated element remains in place. Of the two main orders, the LTR retrotransposons considerably outnumber the LINEs. LINEs integrate into target sites simultaneously with the RNA transcript being copied into cDNA by target-primed reverse transcription. LTR retrotransposon replication is basically equivalent to the intracellular phase of retroviral life cycles. The envelope gene giving extracellular mobility to retroviruses is in fact widespread in plants and their retrotransposons. Evolutionary analyses of the retrotransposons and retroviruses suggest that both form an ancient monophyletic group. The particular adaptations of LTR retrotransposons to plant life cycles enabling their success remain to be clarified.
authors.affiliation: Institute of Biotechnology, Viikki Biocenter, University of Helsinki, P.O. Box 65, Helsinki FIN-00014, Finland; Biotechnology and Food Research, MTT Agrifood Research Finland, Jokioinen FIN-31600, Finland. Electronic address: alan.schulman@helsinki.fi.
authors.forename: Alan H
authors.initials: AH
authors.lastname: Schulman
mesh_terms: D004261:DNA Replication; D010944:Plants / Q000235:genetics*; D018626:Retroelements / Q000235:genetics*; D048348:Reverse Transcription; D014158:Transcription, Genetic
chemical_list: D018626:Retroelements