Molecular Biology and Evolution, Vol 5, 252-269, Copyright © 1988 by Society for Molecular Biology and Evolution
D Anxolabehere, MG Kidwell and G Periquet
Approximately 100 strains derived from natural populations of Drosophila
melanogaster were tested for the presence or absence of P- element
sequences by using two molecular probes derived from internal regions of a
full-sized P element. Strains that had been collected from several
continents at varying times during the past 60 years were examined. The
oldest available strains, representing most major geographical regions of
the world, exhibited no detectable hybridization to the P-element probes.
In contrast, all recently collected natural populations that were tested
carried P-element sequences. The earliest appearance of P elements occurred
in collections made during the 1950s and early 1960s in the Americas and
during the late 1960s on other continents. The youngest strains that were
completely devoid of P elements originated in populations sampled during
the mid-1960s in America, but as late as 1974 in populations from the USSR.
There are differences in the patterns of hybridization to the two P-element
probes between populations from different geographical regions. These
differences are consistent with the varying P-M phenotypic properties of
these populations. Taken together with the results of phenotypic tests
reported in earlier studies, the available evidence is consistent with the
hypothesis of a worldwide P-element invasion of D. melanogaster during the
past 30 years and suggests that the putative invasion of the Americas
possibly preceded by approximately a decade that in Europe, Africa, and the
rest of the world.
ORIGINAL ARTICLE
Molecular characteristics of diverse populations are consistent with the hypothesis of a recent invasion of Drosophila melanogaster by mobile P elements
Laboratoire de Genetique des Populations, Universite Paris VI, France.
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