[Mobile elements in Drosophila natural populations in Azerbaijan].

The distribution of four genome DNA fragments containing different mobile elements in chromosomes of Drosophila melanogaster individuals from Azerbaijan coast and mountain populations was studied. The average copy number of each element was shown to be approx. equal in both populations. Sites of preferential localization, where the elements were present in no less than in half of individuals could be revealed in each population for all the elements. A part of these sites coincided with regions of intercalary heterochromatin, the number of such coincidences being larger in mountain populations. The copy number of the mobile elements under study in X-chromosomes of individuals from natural populations as well as from laboratory strains was less than in autosomes. X-chromosomes of different individuals differed in mobile elements' localization more than autosomes. It was assumed that peculiarities of mobile elements' distribution in X-chromosome could reflect the effect of decondensed structure of chromatin in male X-chromosome on the transposition of mobile elements.