High copy number of highly similar mariner-like transposons in planarian (Platyhelminthe): evidence for a trans-phyla horizontal transfer |
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Authors: | Garcia-Fernandez J; Bayascas-Ramirez JR; Marfany G; Munoz-Marmol AM; Casali A; Baguna J; Salo E |
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Institution: | Departament de Genetica, Facultat de Biologia, Universitat de Barcelona, Spain. |
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Abstract: | Several DNA sequences similar to the mariner element were isolated and
characterized in the platyhelminthe Dugesia (Girardia) tigrina. They were
1,288 bp long, flanked by two 32 bp-inverted repeats, and contained a
single 339 amino acid open-reading frame (ORF) encoding the transposase.
The number of copies of this element is approximately 8,000 per haploid
genome, constituting a member of the middle- repetitive DNA of Dugesia
tigrina. Sequence analysis of several elements showed a high percentage of
conservation between the different copies. Most of them presented an intact
ORF and the standard signals of actively expressed genes, which suggests
that some of them are or have recently been functional transposons. The
high degree of similarity shared with other mariner elements from some
arthropods, together with the fact that this element is undetectable in
other planarian species, strongly suggests a case of horizontal transfer
between these two distant phyla.
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