An abundant and heavily truncated non-LTR retrotransposon  (LINE) family in Beta vulgaris.
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.
Wenke
Torsten
T
Institute of Botany, Dresden University of Technology, 01062 Dresden, Germany.
Holtgräwe
Daniela
D
Horn
Axel V
AV
Weisshaar
Bernd
B
Schmidt
Thomas
T
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
D010940:Plant Proteins
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