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 5′ 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 3′ 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.
Plant Molecular Biology – Springer Journals
Published: Aug 21, 2009
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