Morphology of the Drosophila melanogasterpolytene X chromosome section 20 in normal flies, in strains carrying inversions that break pericentric heterochromatin at different points, and at the background of the Su(UR)ESmutation has been examined. In all of the strains carrying the Su(UR)ESmutation section 20 displayed a distinct banding pattern till to the section 20F, while in the wild-type strains this region was represented by β-heterochromatin. The strains carrying different inversions substantially differed in the number and morphology of bands forming section 20. In the Su(UR)ESmutants the most proximal X chromosome euchromatic gene,su(f), is mapped to the boundary between sections 20E and F, while rDNA forming the middle part of the X chromosome mitotic heterochromatin is located in the proximal part of section 20. All large bands observed in section 20 of the w; Su(UR)ESstrain were also present inIn(1)sc 4; Su(UR)ES, which breaks heterochromatin in the distal part. Hence, the bands of polytene chromosome section 20 are virtually devoid of mitotic heterochromatin.
Russian Journal of Genetics – Springer Journals
Published: Oct 16, 2004
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