title: Cloning of heat-shock locus 93D from Drosophila melanogaster.
abstract: Using the microcloning approach a number of recombinant lambda phages carrying DNA from the 93D region have been isolated. Screening genomic libraries, cloned in phage lambda or cosmid vectors, with this isolated DNA yielded a series of overlapping DNA fragments from the region 93D6-7 as shown by in situ hybridization to polytene chromosomes. In vitro 32P-labelled nuclear RNA prepared from heat-shocked third instar larvae hybridized specifically to one fragment within 85 kb of cloned DNA. The region which is specifically transcribed after heat shock could be defined to a cluster of internally-repetitive DNA and its neighbouring proximal sequences. Over a sequence of 10-12 kb in length the DNA is cut into repeat units of approximately 280 nucleotides by the restriction endonuclease TaqI. The TaqI repeat sequences are unique in the Drosophila genome.
mesh_terms: D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004331:Drosophila melanogaster / Q000235:genetics*; D005796:Genes; D006360:Heat-Shock Proteins / Q000235:genetics*; D008970:Molecular Weight; D009693:Nucleic Acid Hybridization; D010957:Plasmids; D012091:Repetitive Sequences, Nucleic Acid; D014158:Transcription, Genetic
chemical_list: D006360:Heat-Shock Proteins; D004262:DNA Restriction Enzymes