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• W2085151059 abstract "Relative to genomes of other sequenced organisms, the human genome appears particularly enriched for large, highly homologous segmental duplications (⩾90% sequence identity and ⩾10 kbp in length). The molecular basis for this enrichment is unknown. We sought to gain insight into the mechanism of origin, by systematically examining sequence features at the junctions of duplications. We analyzed 9,464 junctions within regions of high-quality finished sequence from a genomewide set of 2,366 duplication alignments. We observed a highly significant (P<.0001) enrichment of Alu short interspersed element (SINE) sequences near or within the junction. Twenty-seven percent of all segmental duplications terminated within an Alu repeat. The Alu junction enrichment was most pronounced for interspersed segmental duplications separated by ⩾1 Mb of intervening sequence. Alu elements at the junctions showed higher levels of divergence, consistent with Alu-Alu–mediated recombination events. When we classified Alu elements into major subfamilies, younger elements (AluY and AluS) accounted for the enrichment, whereas the oldest primate family (AluJ) showed no enrichment. We propose that the primate-specific burst of Alu retroposition activity (which occurred 35–40 million years ago) sensitized the ancestral human genome for Alu-Alu–mediated recombination events, which, in turn, initiated the expansion of gene-rich segmental duplications and their subsequent role in nonallelic homologous recombination. Relative to genomes of other sequenced organisms, the human genome appears particularly enriched for large, highly homologous segmental duplications (⩾90% sequence identity and ⩾10 kbp in length). The molecular basis for this enrichment is unknown. We sought to gain insight into the mechanism of origin, by systematically examining sequence features at the junctions of duplications. We analyzed 9,464 junctions within regions of high-quality finished sequence from a genomewide set of 2,366 duplication alignments. We observed a highly significant (P<.0001) enrichment of Alu short interspersed element (SINE) sequences near or within the junction. Twenty-seven percent of all segmental duplications terminated within an Alu repeat. The Alu junction enrichment was most pronounced for interspersed segmental duplications separated by ⩾1 Mb of intervening sequence. Alu elements at the junctions showed higher levels of divergence, consistent with Alu-Alu–mediated recombination events. When we classified Alu elements into major subfamilies, younger elements (AluY and AluS) accounted for the enrichment, whereas the oldest primate family (AluJ) showed no enrichment. We propose that the primate-specific burst of Alu retroposition activity (which occurred 35–40 million years ago) sensitized the ancestral human genome for Alu-Alu–mediated recombination events, which, in turn, initiated the expansion of gene-rich segmental duplications and their subsequent role in nonallelic homologous recombination." @default.
• W2085151059 created "2016-06-24" @default.
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• W2085151059 date "2003-10-01" @default.
• W2085151059 modified "2023-10-10" @default.
• W2085151059 title "An Alu Transposition Model for the Origin and Expansion of Human Segmental Duplications" @default.
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• W2085151059 doi "https://doi.org/10.1086/378594" @default.
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