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GrainGenes Reference Report: PLC-11-1769

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Reference	PLC-11-1769
Title	Retrotransposon BARE-1 and its role in genome evolution in the genus Hordeum
Journal	Plant Cell
Year	1999
Volume	11
Pages	1769-1784
Author	Vicient CM [ Show all 7 ]
Abstract	The replicative retrotransposon life cycle offers the potential for explosive increases in copy number and consequent inflation of genome size. The BARE-1 retrotransposon family of barley is conserved, disperse, and transcriptionally active. To assess the role of BARE-1 in genome evolution, we determined the copy number of its integrase, its reverse transcriptase, and its long terminal repeat (LTR) domains throughout the genus Hordeum. On average, BARE-1 contributes 13.7 x 10(3) full-length copies, amounting to 2.9% of the genome. The number increases with genome size. Two LTRs are associated with each internal domain in intact retrotransposons, but surprisingly, BARE-1 LTRs were considerably more prevalent than would be expected from the numbers of intact elements. The excess in LTRs increases as both genome size and BARE-1 genomic fraction decrease. Intrachromosomal homologous recombination between LTRs could explain the excess, removing BARE-1 elements and leaving behind solo LTRs, thereby reducing the complement of functional retrotransposons in the genome and providing at least a partial 'return ticket from genomic obesity'.
Keyword	bare-1 [ Show all 26 ]

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