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Polymorphism at the g 6pd and 6pgd loci in drosophila melanogaster 4. genetic factors modifying enzyme activity


, : Polymorphism at the g 6pd and 6pgd loci in drosophila melanogaster 4. genetic factors modifying enzyme activity. Biochemical Genetics 18(7-8): 699-716

Different homozygous lines of similar genotype with respect to G6pd and 6Pgd were shown to have different enzyme activities for G6PD [glucose-6-phosphate dehydrogenase] and 6PGD [6-phosphogluconate dehydrogenase]. Crosses between high and low lines suggested that there were modifying genes present on the autosomes, while others were probably located on the X chromosome. Allelic variation within each electrophoretic class of G6pd and 6Pgd might also have contributed to this variation. An experiment in adaptation to sodium octanoate demonstrated that in adapted flies selection for lower enzyme activity had occurred, which provided further evidence for the existence of genetic differences in activity. A strong positive correlation between the activities of G6PD and 6PGD was found for each genotype. Since no correlation was found between MDH [malate dehydrogenase] and the 2 enzymes G6PD and 6PGD, this correlation was probably rather specific for G6PD and 6PGD. Interaction between genotypes with respect to activity was also found. The variation at 6Pgd influenced the activity of G6PD within a genotype. The data are discussed in relation to fitness differences.

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PMID: 6781470


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