Abstract
The effects of six recessive visible Notch mutations on the activities of four enzymes of the mitochondrial respiratory chain are described. Their effects in hemizygous condition in males are similar to those of the recessive lethal Notch mutations in heterozygous condition. This explains their viability. The characteristic morphological Notch expression cannot be related to the different activity patterns of four enzymes caused by the recessive visible mutations. Whereas there is a correspondence between the location of the recessive lethals and the recessive visibles in relation to their enzyme activity patterns, this is not so in relation to their morphological effects. In contrast to the enzyme activity determinations in heterozygotes for recessive lethals, the effects of recessive visibles are determined in the hemizygous condition, thereby excluding the influence of wildtype Notch alleles. Such an influence is found in heterozygotes for the exceptional fa nomutant, in which morphological expression is dependent on the wildtype X chromosome.
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Demerec, M., 1934. Biological action of small deficiencies of X-chromosome of Drosophila melanogaster. Proc. natn. Acad. Sci. U.S.A. 20: 354–359.
Enzyme nomenclature, 1978. I.U.B., 1979. Academic Press, New York, San Francisco, London.
Li, J.C., 1927. The effect of chromosome aberrations on development in Drosophila melanogaster. Genetics 12: 1–58.
Lindsley, D. L. & Grell, E. H., 1968. Genetic variations of Drosophila melanogaster. Publs Carnegie Inst. No 627.
Mohr, O. L., 1919. Character changes caused by mutation of an entire region of a chromosome in Drosophila. Genetics 4: 275–282.
Poulson, D. F., 1968. The embryogenetic function of the Notch locus in Drosophila melanogaster. Proc. 12th Int. Congr. Genet., Tokyo 1968, 1: 143.
Portin, P., 1980. On the cell lethality of Notch and Abruptex mutations of Drosophila melanogaster. Hereditas 92: 303–307.
Thörig, G. E. W., Heinstra, P. W. H. & Scharloo, W., 1981a. The action of the Notch locus in Drosophila melanogaster I. Effects of the Notch 8 deficiency on mitochondrial enzymes. Mol. gen. Genet. 182: 31–38.
Thörig, G. E. W., Heinstra, P. W. H. & Scharloo, W., 1981b. The action of the Notch locus in Drosophila melanogaster II. Biochemical effects of recessive lethals on mitochondrial enzymes. Genetics 99, in press.
Welshons, W. J. & von Halle, E. S., 1962. Pseudoallelism at the Notch locus in Drosophila. Genetics 47: 743–759.
Welshons, W. J., 1965. Analysis of a gene in Drosophila. Science 150: 1122–1129.
Welshons, W. J., 1971. Genetic basis for two types of recessive lethality at the Notch locus of Drosophila. Genetics 68: 259–268.
Welshons, W. J., 1974. The cytogenetic analysis of a fractured gene in Drosophila. Genetics 76: 775–794.
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Thörig, G.E.W., Scharloo, W. The action of the Notch locus in Drosophila melanogaster III. Biochemical effects of recessive visible mutations on mitochondrial enzymes. Genetica 57, 219–223 (1982). https://doi.org/10.1007/BF00056486
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DOI: https://doi.org/10.1007/BF00056486