Abstract
Horizontal transfer in Drosophila has been inferred for several families of transposable elements. Specifically, the retroelement roo has been suggested to have been horizontally transferred between the species D. melanogaster, D. simulans, D. sechellia and D. yakuba. The inferences were based on the observation that divergence between transposable elements in different species was lower than the divergence found in typical nuclear genes and in the incongruence of phylogenies of the species and their TEs. Here, we address the question of the possible horizontal transfer of roo between species of the Drosophila genus by studying the presence absence of a duplication of 99 bp in the 5’UTR of the transposon, as well as comparing the sequences of the paralogous and orthologous duplicated repeats within and between species. First, the repeats were only found in five species of the melanogaster subgroup. Second, the date of occurrence of the duplication event originating the repeats was posterior to the split of the subgroup. The duplication date suggests an origin previous to the split of D. simulans and D. sechellia and close to the divergence of D. melanogaster from the D. simulans complex. These data point to horizontal transfer to the afrotropical species D. yakuba and D. erecta from one of the cosmopolitan species D. melanogaster or D. simulans. We propose that the parasitoid wasp Leptopilina could have been the vector of horizontal transfer after the observation that a sequence of 845 bp with high homology to a fragment of roo was isolated from this wasp.
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I thank Fernando Rodríguez for his critical reading of the manuscript and Sara de Albornoz for the correction and improvement of my English.
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Domínguez, A. Interrogating the 5’UTR tandem repeats of retrotransposon roo of Drosophila about horizontal transfer. Genetica 149, 171–177 (2021). https://doi.org/10.1007/s10709-021-00120-y
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DOI: https://doi.org/10.1007/s10709-021-00120-y