Molecular Biology and Evolution, Vol 8, 282-296, Copyright © 1991 by Society for Molecular Biology and Evolution
L Pascual and G Periquet
Forty-six strains derived from American and French natural populations of
Drosophila melanogaster were tested for the presence and activity of hobo
elements by using Southern blotting and a gonadal dysgenesis assay. The
oldest available strains exhibited weak detectable hybridization to the
hobo-element probe and revealed neither hobo- activity potential nor
hobo-repression potential. In contrast, all recently collected strains
harbored hobo sequences and revealed a strong hobo-repression potential but
no strong hobo-activity potential. On the basis of restriction-enzyme
analysis, old strains appear to have numerous fragments hybridizable to
hobo sequences, several probably conserved at the same locations in the
genome of the tested strain and others dispersed. In recently isolated
strains, and unlike the situation in the published sequence of the cloned
hobo108 element, a PvuII site is present in the great majority of
full-sized hobo elements and their deletion derivatives. When the genetic
and molecular characteristics are considered together, the available
evidence is consistent with the hypothesis of a worldwide hobo-element
invasion of D. melanogaster during the past 50 years. Comparison of data
from the I- R and P-M systems suggests that the putative invasion followed
the introduction of the I element but preceded that of the P element. This
hypothesis poses the problem of the plausibility of three virtually
simultaneous element invasions in this species. Such a possibility might be
due to a modification of the genetic structure of American populations of
D. melanogaster during the first part of the 20th century.
ORIGINAL ARTICLE
Distribution of hobo transposable elements in natural populations of Drosophila melanogaster
Institut de Biocenotique, Experimentale des Agrosystemes, Universite F. Rabelais, Tours, France.
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