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    Genomics. 2009 Mar;93(3):205-12. Epub 2008 Nov 11.

    An alternative pathway for Alu retrotransposition suggests a role in DNA double-strand break repair.

    Srikanta D, Sen SK, Huang CT, Conlin EM, Rhodes RM, Batzer MA.

    Department of Biological Sciences, Biological Computation and Visualization Center, Louisiana State University, Baton Rouge, LA 70803, USA.

    The Alu family is a highly successful group of non-LTR retrotransposons ubiquitously found in primate genomes. Similar to the L1 retrotransposon family, Alu elements integrate primarily through an endonuclease-dependent mechanism termed target site-primed reverse transcription (TPRT). Recent studies have suggested that, in addition to TPRT, L1 elements occasionally utilize an alternative endonuclease-independent pathway for genomic integration. To determine whether an analogous mechanism exists for Alu elements, we have analyzed three publicly available primate genomes (human, chimpanzee and rhesus macaque) for endonuclease-independent recently integrated or lineage specific Alu insertions. We recovered twenty-three examples of such insertions and show that these insertions are recognizably different from classical TPRT-mediated Alu element integration. We suggest a role for this process in DNA double-strand break repair and present evidence to suggest its association with intra-chromosomal translocations, in-vitro RNA recombination (IVRR), and synthesis-dependent strand annealing (SDSA).

    PMID: 18951971 [PubMed - indexed for MEDLINE]

    PMCID: 2672417

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