Abstract
The rosy locus of Drosophila melanogaster encodes the enzyme xanthine dehydrogenase (XDH, xanthine: NAD oxidoreductase). The most thoroughly studied gene-enzyme system in higher eukaryotes (Sang, 1984), and long a paradigm for eukaryotic gene organization, the rosy locus has recently become a fertile system for analysis of eukaryotic gene regulation. The major reasons for this are:
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1
The locus encodes an enzyme (XDH) that has been isolated and characterized and is easily assayed in extracts of small numbers of whole organisms or isolated tissues (see Sections 3 and 6).
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2
The locus has been subject to intensive fine-structure genetic analyses that have defined its limits and organization (see Sections 4 and 7).
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3
Effective phenotypic selection and screening protocols are available (see Section 2), taking advantage of conditional lethality at the locus, and resulting in the isolation of a wealth of mutants, including regulatory variants (see Section 7).
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4
It is clear that expression of rosy is regulated at both the stage and tissue levels during development (see Section 6); mutants that affect particular stages and tissues have been identified (see Section 7).
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5
The locus has been cloned and sequenced. Thus, molecular probes are available for analyses at the DNA and RNA levels (see Sections 4 and 5).
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6
The technique of P element-mediated transformation was initiated using the rosy system, and genetic and molecular analyses using transposons are now quite advanced (see Sections 4 and 7). Manipulation of rosy transposons also permits analysis of a range of regulatory phenomena not exclusive to XDH, including euchromatic position effects, heterochromatic position effects, and dosage compensation (see Section 7).
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Dutton, F.L., Chovnick, A. (1988). Developmental Regulation of the rosy Locus in Drosophila melanogaster . In: Browder, L.W. (eds) The Molecular Biology of Cell Determination and Cell Differentiation. Developmental Biology, vol 5. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-6817-9_10
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