PATTERNS OF TRANSPOSABLE ELEMENTS DISTRIBUTION
ON THE DROSOPHILA MELANOGASTER POLYTENE CHROMOSOMES BEFORE
AND AFTER SELECTION FOR A QUANTITATIVE TRAIT
L. P. Zakharenko, M. P. Perepelkina, O. V. Antonenko, O. V. Vykhristyuk, V. M. Efimov, L. A. Vasil’eva
Institute of Cytology and Genetics, Siberian Branch of RAS, Novosibirsk;
1 e-mail: zakharlp@bionet.nsc.ru
The effect of selection for radius vein length on the distribution of hybridization sites of the P and hobo
transposons and the mdg1 and mdg2 retrotransposons on polytene chromosomes of Drosophila melanogaster
salivary glands was studied. The patterns of these transposable elements (TEs) distribution were polymorphic in
both the parental strain and selected strains. The similarity in mdg1 and mdg2 patterns between strains selected
in one direction was closer than between strains selected in opposite directions, but the selected strains were closer
to each other than to the parental strain regardless of selection direction. No mdg2 hybridization sites that
would be absent in the control were found in the selected strains. There were more mdg2 and hobo hybridization
sites in the strains selected in the (+) direction than in the (–) direction. The mobility of hobo copies in the strains
studied correlated with the presence of its full-sized copy in the genome. The polymorphism of all TEs studied
except for mdg1 was greater for strains selected in the (+) direction that in the (–) direction. These facts suggest
that some TEs migrate over the genome independently of selection, and others are markers of evolutionary
events rather than their causes.
Key words: selection, quantitative trait, transposable elements, Drosophila melanogaster
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