Summary
Measurement of dopa decarboxylase (DDC) levels in 109 strains of Drosophila melanogaster isogenic for second chromosomes isolated independently from natural populations was undertaken. One of the most extreme variants, designated Ddc +4, was shown to have about 20% more DDC activity at adult eclosion than a standard laboratory strain used for comparison. The DDC overproduction was shown to segregate with the second chromosome and was mapped to a position within 0.15 map units of the DDC structural gene. The variant was shown to be an underproducer of DDC activity at pupariation and the genetic element responsible for this trait mapped in an identical fashion to that causing overproduction. The temporal phenotype described above was observed in the epidermis but DDC activity levels in neural tissue were normal. Examination of CRM levels at pupariation and eclosion revealed that altered DDC protein levels were responsible for the variant DDC activity levels. Electrophoretic analysis under both denaturing and non-denaturing conditions indicated that the DDC molecules in Ddc +4 and the laboratory strain were indistinguishable. These results suggest that alterations in a genetic element (or elements) lying in close proximity to the structural gene are responsible for the complex temporal phenotype of DDC activity exhibited in the variant Ddc +4.
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Abbreviations
- CRM:
-
cross-reacting material
- DDC:
-
dopa decarboxylase
- PTU:
-
phenylthiourea
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Communicated by W. Gehring
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Estelle, M.A., Hodgetts, R.B. Genetic elements near the structural gene modulate the level of dopa decarboxylase during Drosophila development. Mol Gen Genet 195, 434–441 (1984). https://doi.org/10.1007/BF00341444
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DOI: https://doi.org/10.1007/BF00341444