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. 1986 Mar;83(6):1812–1816. doi: 10.1073/pnas.83.6.1812

Heat shock locus 93D of Drosophila melanogaster: a spliced RNA most strongly conserved in the intron sequence.

J C Garbe, M L Pardue
PMCID: PMC323174  PMID: 3081901

Abstract

The Drosophila melanogaster heat shock locus at 93D encodes at least three overlapping transcripts, 10-12 kilobases (kb), 1.9 kb, and 1.2 kb. The abundance of the three transcripts is significantly increased during heat shock; however, all are also found in non-heat-shocked cells. The 1.2-kb transcript is found in the cytoplasm. Sequence analysis of a 1.1-kb cDNA clone representing sequences within the 1.2-kb transcript and comparison to genomic sequences indicate that it is spliced; 700 base pairs of sequence found in genomic DNA are removed from the middle of the transcript. Sequence analysis further suggests that this RNA does not encode a heat shock protein. The largest open reading frame beginning with a methionine codon would encode a polypeptide of 34 amino acids. We have not been able to detect a heat shock-induced polypeptide of this size. A DNA clone from the analogous heat shock puff of Drosophila hydei has been analyzed by hybridization with the small subclones used to sequence the D. melanogaster cDNA plus a genomic fragment containing the 700-base-pair intron. Results of this hybridization indicated strong homology of the intron fragment. Weaker homology was detected with the two small fragments flanking the intron. Other fragments of the D. melanogaster cDNA showed no hybridization to the cloned D. hydei puff DNA.

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