Molecular Biology and Evolution 18:1979-1982 (2001)
© 2001 Society for Molecular Biology and Evolution
Drosophila P Transposons in the Human Genome?
Institute of Medical Biology, University of Vienna, Vienna, Austria
P elements are DNA transposons that were first discovered to be the causative agent of hybrid dysgenesis in Drosophila melanogaster (Kidwell, Kidwell, and Sved 1977
) but were later found to occur in many drosophilid species. The interspecific distribution of P-element sequences, as well as their sequence relationships, is not in accordance with the phylogeny of their host species. Therefore, P elements are not merely vertically inherited but can also be transmitted horizontally between sexually isolated taxa. The most striking example is the rather recent transfer from Drosophila willistoni to D. melanogaster (Daniels et al. 1990
), which must have occurred in the last century and was followed by a rapid spread of P elements through the natural populations of this new host (Anxolabéhère, Kidwell, and Periquet 1988
). Additional cases of horizontal transmission show that P elements have repeatedly crossed species barriers and have even invaded species of
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