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The isolation and characterization of a mutant allele at a new X-linked locus,mex, affecting NADP+-dependent enzymes inDrosophila melanogaster

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Abstract

The isolation and characterization of mutant alleles in a regulatory gene affecting NADP+-dependent enzymes are described. The locus,mex, is at position 26.5 ± 0.74 on the X chromosome ofDrosophila melanogaster. The newly isolated mutant allele,mex 1, is recessive to either themex allele found in Oregon-R wild-type individuals or that found in thecm v parental stock in which the new mutants were induced. Themex 1 mutant allele is associated with statistically significant decreases in malic enzyme (ME) specific activity and ME specific immunologically cross-reacting material (ME-CRM) in newly emerged adult males. During this same developmental stage in males, the NADP+-dependent isocitrate dehydrogenase specific activity increases to statistically significant levels. Females of themex 1 mutant strain show statistically significant elevated levels of the pentose phosphate shunt enzymes, glucose-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase. Isoelectric focusing and thermolability comparisons of the active ME from mutant and control organisms indicate that the enzyme is the same. Developmental profiles ofmex 1 and control strains indicate that this mutant allele differentially modulates the levels of ME enzymatic activity and ME-CRM during development.

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Authors and Affiliations

  1. Department of Biological Sciences, The University of Calgary, T2N 1N4, Calgary, Alberta, Canada

    Andrew R. Gromnicki & Michael M. Bentley

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  1. Andrew R. Gromnicki
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  2. Michael M. Bentley
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This work was supported by an Operating Grant from the Natural Sciences and Engineering Research Council of Canada to M.M.B.

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Gromnicki, A.R., Bentley, M.M. The isolation and characterization of a mutant allele at a new X-linked locus,mex, affecting NADP+-dependent enzymes inDrosophila melanogaster . Biochem Genet 29, 145–162 (1991). https://doi.org/10.1007/BF02401809

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  • DOI: https://doi.org/10.1007/BF02401809

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