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. 1984 Jan;106(1):73–84. doi: 10.1093/genetics/106.1.73

Spontaneous Mutations Modifying the Activity of Alcohol Dehydrogenase (Adh) in DROSOPHILA MELANOGASTER

Terumi Mukai 1, Ko Harada 1, Hiroshi Yoshimaru 1
PMCID: PMC1202247  PMID: 6420229

Abstract

In a marked-inversion balanced lethal system of the second chromosome of Drosophila melanogaster, mutations were accumulated under minimum pressure of natural selection in 1000 individual lines that originated essentially from two individuals. After about 300 generations, the specific activities of alcohol dehydrogenase of 69 randomly selected individual lines were measured with replications using four replicated vials (on 2 days—two replications per day) by observing the reduction of NAD+ to NADH at 340 nm. Total soluble protein as the basis of standardization of enzyme activity was measured by the Lowry method for each vial. A control experiment was made immediately after the establishment of 20 individual lines from a single genotype. A significant increase in genetic variance was observed among the mutation-accumulating lines but was not detected in the control experiment. The statistical analysis of the data on the basis of the one-band/one-gene hypothesis suggests that many mutations controlling the activity of alcohol dehydrogenase occurred in regions different from the alcohol dehydrogenase locus itself, mainly in the noncoding DNA. Furthermore, it is suggested that transposon-like elements are related to the induction of these changes in alcohol dehydrogenase specific activities. Additional experimental evidence supporting this conclusion is also given.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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