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Genetic analysis of the larval secretion gene Sgs-4 and its regulatory chromosome sites in Drosophila melanogaster

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Abstract

Larval salivary gland secretion from seven wild-type stocks of Drosophila melanogaster was electrophoretically analyzed. Considerable variability occurs in the X-chromosomally coded secretion protein 4, both qualitatively, as expressed by differences in electrophoretic mobilities, and quantitatively as seen by its relative amount in the secretion. Drosophila stocks with “normal” amounts of protein 4 show approximately 80–90% dosage compensation in the males, whereas in two stocks with lower amounts of protein 4 there is no indication of dosage compensation. — Genetic analysis showed that the properties of secretion protein 4 and the level of expression of the Sgs-4 gene are controlled by the X-chromosome. Recombination experiments indicate that the stock-specific characteristics of protein 4 are properties of the structural gene Sgs-4 itself or of a chromosome region immediately adjacent to Sgs-4. One recombinant (R + 79), manifesting an intermediate level of dosage compensation, indicates that a chromosome segment closely distal to Sg-4 is responsible for the regulation of the gene and for dosage compensation in particular. Accordingly, Sgs-4 must be transcribed from distal to proximal. Its position on the genetic map is 3.6. Two stocks, Hikone-R and Kochi-R, which were originally described as 0-mutants produce very low amounts of a specific secretion protein, 4 h, as revealed by a transvection effect and also by fluorography of overloaded gels.

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  1. Institut für Genetik der Freien Universität Berlin, Arnimallee 5-7, D-1000, Berlin 33

    Günter Korge

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  1. Günter Korge
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Dedicated to Professor W. Beermann on the occasion of his 60th birthday

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Korge, G. Genetic analysis of the larval secretion gene Sgs-4 and its regulatory chromosome sites in Drosophila melanogaster . Chromosoma 84, 373–390 (1981). https://doi.org/10.1007/BF00286027

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