[An analysis of the DNA sequence in the region of the breakpoint of the T(1;2)dor(var7) translocation inducing the mosaic-type position effect in Drosophila melanogaster].

The sites of location of (AC/GT) minisatellite sequence were detected in 2B region of X-chromosome of Drosophila melanogaster. The distribution of (AC/GT) repeats coincided with the location of one-half of the mapped breakpoints of known rearrangements within this region. Analysis of sequences neighbouring the breakpoints of the rearrangement T(1;2)dor(var7) demonstrated that the breaks between two sequences of (AC/GT) repeats occurred at a distance 80 and 156 bp, respectively, but there were no (AC/GT) repeats in r combination directly. T-rich sequences 25 bp long as well as short tandem repeats were found near the breakpoints. The pentanucleotide repeat (CTGTT)10 is located at a distance of 660 bp from the breakpoint. It differs by one nucleotide from the sequence of the GTGTT satellite attached to the 1A-2B fragment of X-chromosome as a result of rearrangement.