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Composite non-LTR retrotransposons in hominoid primates.
Mobile Genetic Elements 2015 September
Composite retrotransposons are widely distributed in the plant and animal kingdoms. Some of the most complex of these are found in hominoid primates. SVA, LAVA, PVA and FVA combine simple repeats, Alu fragments, a VNTR (Variable Number of Tandem Repeats) and variable 3' domains, which are, except for PVA, derived from other retrotransposons. Although a likely precursor of SVA-a "tailed VNTR" named SVA2-had been identified in the Rhesus genome, the exact sequence and mechanism of the assembly of this type of composite retrotransposon had been elusive. The discovery of LAVA, PVA and FVA in gibbons provided the opportunity to delineate the order of assembly of the components of VNTR-containing retrotransposons. Our recent analysis suggests that an extinct "Alu-SVA2" acquired variant 3' ends by splicing. In this commentary I will discuss the mode of assembly of VNTR composites in the context of their capacity to engage in alternative splicing to co-mobilize host RNA sequences and to become exonized. The second part will focus on structural determinants of VNTR composite retrotransposon mobilization in the context of lineage-specific expansion of particular families/subfamilies of these elements.
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