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  • 1
    Electronic Resource
    Electronic Resource
    Genetics of esterases in Drosophila. IV. Slow-migrating S-esterase in Drosophila of the virilis group (1976)
    Springer
    Biochemical genetics 14 (1976), S. 161-182 
    Details
    ISSN: 1573-4927
    Keywords: esterases ; Drosophila imeretensis ; electrophoresis ; interspecific hybrids ; gene activation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A slow-migrating β-esterase (S-esterase) is described which has been detected in Drosophila montana, Drosophila imeretensis, and some stocks of Drosophila virilis when mixtures of α- and β-naphthyl acetate are used as substrates in histochemical reactions after electrophoresis. Sexual dimorphism for S-esterase has been demonstrated. This esterase is contained in male genitalia only, predominantly in the ejaculatory bulb (waxy plug). It appears 3–4 days after emergence of flies. In hybrids between S+ and S0 species, the activity of the slow esterase is either decreased or inhibited. An autonomous synthesis of the S-esterase in the ejaculatory bulb was established by transplantation of imaginal genital discs into larvae of different Drosophila stocks. Based on analysis of physicochemical and immunochemical properties, S-esterase is suggested to be an independent fraction of esterase, possibly dimeric, which does not cross-react with β-esterase antiserum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484882
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  • 2
    Electronic Resource
    Electronic Resource
    Genetics of esterases in Drosophila of the virilis group. II. Sequential expression of paternal and maternal esterases in ontogenesis (1974)
    Springer
    Biochemical genetics 12 (1974), S. 1-7 
    Details
    ISSN: 1573-4927
    Keywords: esterases ; Drosophila virilis ; electrophoresis ; Drosophila embryogenesis ; gene activation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Changes in esterase patterns in hybrids between Drosophila virilis stocks differing in the electrophoretic mobilities of certain esterase fractions have been studied by means of starch and polyacrylamide gel electrophoresis. It has been established that parental esterases are expressed synchronously during the period of the end of embryogenesis to the beginning of first instar larvae. This period coincides with the biochemically detected increase in esterase activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00487523
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  • 3
    Electronic Resource
    Electronic Resource
    Genetics of esterases in Drosophila. III. Influence of different chromosomes on esterase pattern in Drosophila (1974)
    Springer
    Biochemical genetics 12 (1974), S. 9-24 
    Details
    ISSN: 1573-4927
    Keywords: Drosophila melanogaster ; Drosophila simulans ; interspecific hybrids ; esterases ; regulation by X chromosome in Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The present report presents the results of starch and polyacrylamide gel electrophoretic studies of the influence of the X chromosome on the expression of esterase-6 in D. melanogaster × D. simulans hybrids heterozygous for locus Est-6 as well as studies of the influence of autosomes on esterase expression in Drosophila of the virilis group. A differential expression of esterase-6 has been detected in D. melanogaster × D. simulans hybrid males. A differential decrease in the activity of esterase-6 (both F and S allozymes) derived from D. melanogaster has been noted. In hybrid females, the activity of parental esterases is the same. It is suggested that the X chromosome regulates the expression of esterase-6 in D. melanogaster. Analysis of individuals obtained in different schemes of crosses between different species of Drosophila of the virilis group by use of stocks marked with mutations in various chromosomes indicates that other autosomes (in particular, autosomes 4 and 5) also influence the phenotypic expression of esterases (which are controlled by genes located on the second chromosome).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00487524
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