Using fluorescent in situ hybridization technique (FISH), the frequency of hobo and P mobile elements transpositions on X chromosomes from the y 2-717 , isolated from the Uman’ population of Drosophila melanogaster, as well as from its phenotypically normal and mutant derivatives, obtained as a result of crosses the males examined with the C(I)DX,ywf/Y females, was evaluated. It was demonstrated that the maximum frequency of hobo transpositions on X chromosomes of the males from derivative strains, subjected to repeated hobo-dysgenic crosses reached a value of 1.2 × 10−2 per site per X chromosome per generation. The number of hobo copies in male X chromosomes from derivative strains was 3 times higher than in the original initial strain. Furthermore, the “old” hobo sites remained unchanged. In derivative strains, the frequency of hobo insertion was higher than that of excisions. One of the derivative strains, y 1t-717a1k3-2 , was characterized by high intrastrain instability of hobo element localization. In the y 2-717a1k3 and y 1t-717a1k3-2 strains a large inversion, In(1)IB; 13CD, was described. At the absence of the full-sized P element in the strains involved in crosses, maximum frequency of P element transpositions in the derivative strains reached a value of 1.2 × 10−2 per site per X chromosome per generation.
Russian Journal of Genetics – Springer Journals
Published: Jun 16, 2006
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