New heat shock puffs and beta-galactosidase activity resulting from transformation of Drosophila with an hsp70-lacZ hybrid gene - PubMed (original) (raw)
New heat shock puffs and beta-galactosidase activity resulting from transformation of Drosophila with an hsp70-lacZ hybrid gene
J T Lis et al. Cell. 1983 Dec.
Abstract
A hybrid gene that consists of the Drosophila heat shock gene, hsp70, fused to the E. coli beta-galactosidase gene has been introduced into the Drosophila germline by the P element microinjection method. This hybrid includes 194 bp of sequence upstream of the start of the hsp70 transcript. Three strains of transformed flies were isolated and characterized by DNA blotting experiments and by in situ hybridization to polytene chromosomes. Strain Bg61 has a single insert of the hybrid gene at the tip of chromosome 3L, site 61A, and the insert consists of a structure that is consistent with P-element-mediated transposition. Strain Bg9,61 has inserts at both 61A and 9E, while Bg64 has a single insert at 64D. Heat shock induces the formation of a large chromosomal puff at all three sites. These puffs appear and regress with kinetics indistinguishable from the puffing of the heat shock locus, 87C, from which the hsp70 gene, used in these studies, was isolated. The beta-galactosidase activity in the transformants is inducible by heat shock and shows a widespread distribution throughout the tissues of larvae and adults.
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