PMID: 6411930Aug 25, 1983Paper

DNA sequences, gene regulation and modular protein evolution in the Drosophila 68C glue gene cluster

Journal of Molecular Biology
M D GarfinkelE M Meyerowitz

Abstract

The 68C locus of the Drosophila melanogaster polytene chromosomes contains the structural genes for three glue polypeptides (sgs-3, sgs-7 and sgs-8) synthesized in the larval salivary glands during the third larval instar. When the messenger RNAs for the glue polypeptides are being synthesized, the locus is puffed; the puff regresses in response to the steroid hormone ecdysterone. The three 68C glue mRNAs are coded in a gene cluster of less than 5000 base-pairs, and are expressed co-ordinately. In the experiments described here we show that the coordinate expression of these RNAs does not result from amplification of the puff DNA, nor is it associated with puff DNA rearrangement. We also report the nucleotide sequence of 6751 base-pairs of genomic DNA that includes the entire gene cluster, and describe coding and non-coding sequences with possible regulatory roles. In addition, we deduce the amino acid sequences of the primary translation products of the glue mRNAs, and show that the glue proteins form a diverged gene family. The members of the family all contain an amino-terminal hydrophobic block of amino acids, which is absent in the mature, secreted glue proteins, and a cysteine-rich carboxy-terminal module. sgs-3 differs f...Continue Reading

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Citations

Mar 1, 1984·Developmental Biology·T E Crowley, E M Meyerowitz
Dec 1, 1986·Developmental Biology·M A Crosby, E M Meyerowitz
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