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Genetics, Vol 126, 1071-1082, Copyright © 1990
INVESTIGATIONS |
Mobile Element Insertions Causing Mutations in the Drosophila suppressor of sable Locus Occur in DNase I Hypersensitive Subregions of 5'-Transcribed Nontranslated Sequences
R. A. Voelker, J. Graves, W. Gibson and M. Eisenberg
Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
The locations of 16 mobile element insertions causing mutations at the Drosophila suppressor of sable [su(s)] locus were determined by restriction mapping and DNA sequencing of the junction sites. The transposons causing the mutations are: P element (5 alleles), gypsy (3 alleles), 17.6, HMS Beagle, springer, Delta 88, prygun, Stalker, and a new mobile element which was named roamer (2 alleles). Four P element insertions occur in 5' nontranslated leader sequences, while the fifth P element and all 11 non-P elements inserted into the 2053 nucleotide, 5'-most intron that is spliced from the 5' nontranslated leader ~100 nucleotides upstream of the translation start. Fifteen of the 16 mobile elements inserted within a ~1900 nucleotide region that contains seven 100-200-nucleotide long DNase I-hypersensitive subregions that alternate with DNase I-resistant intervals of similar lengths. The locations of these 15 insertion sites correlate well with the roughly estimated locations of five of the DNase I-hypersensitive subregions. These findings suggest that the features of chromatin structure that accompany gene activation may also make the DNA susceptible to insertion of mobile elements.
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