title: An abundant and heavily truncated non-LTR retrotransposon  (LINE) family in Beta vulgaris.
abstract: We describe a non-LTR retrotransposon family,BvL, of the long interspersed nuclear elements L1 clade isolated from sugar beet (Beta vulgaris). Characteristic molecular domains of three full-length BvL elements were determined in detail, showing that coding sequences are interrupted and most likely non-functionally. In addition,eight highly conserved endonuclease regions were defined by comparison with other plant LINEs. The abundant BvL family is widespread within the genus Beta, however, the vast majority of BvL copies are extremely 50 truncated indicating an error-prone reverse transcriptase activity. The dispersed distribution of BvL copies on all sugar beet chromosomes with exclusion of most heterochromatic regions was shown by fluorescent in situ hybridization. The analysis of BvL 30 end sequences and corresponding flanking regions, respectively, revealed the preferred integration of BvL into A/T-rich regions of the sugar beet genome, but no specific target sequences.
authors.affiliation: Institute of Botany, Dresden University of Technology, 01062 Dresden, Germany.
authors.forename: Torsten
authors.initials: T
authors.lastname: Wenke
authors.forename: Daniela
authors.initials: D
authors.lastname: Holtgräwe
authors.forename: Axel V
authors.initials: AV
authors.lastname: Horn
authors.forename: Bernd
authors.initials: B
authors.lastname: Weisshaar
authors.forename: Thomas
authors.initials: T
authors.lastname: Schmidt
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D027461:Beta vulgaris / Q000235:genetics*; D032461:Chromosomes, Plant; D017124:Conserved Sequence; D017404:In Situ Hybridization, Fluorescence; D020084:Long Interspersed Nucleotide Elements / Q000502:physiology*; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D010802:Phylogeny; D010940:Plant Proteins / Q000737:chemistry* / Q000235:genetics / Q000502:physiology; D016415:Sequence Alignment
chemical_list: D010940:Plant Proteins
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