Genetics, Vol 132, 725-736, Copyright © 1992


INVESTIGATIONS

Characterization of Suppressor of fused, a Complete Suppressor of the fused Segment Polarity Gene of Drosophila melanogaster

T. Preat
Present address: Theodor-Boveri-Institut fur Biossenschaften, der Universitat Wurzburg, Lehrsthuhl fur Genetik, D-8700 Wurzburg, Germany.

fused (fu) is a maternal effect segment polarity gene of Drosophila melanogaster. In addition, fu females have tumorous ovaries. Two ethyl methanesulfonate mutageneses were carried out in order to isolate suppressors of the fu phenotype. A new gene, Suppressor of fused (Su(fu)), was identified. It is located in the 87C8 region of the third chromosome. Su(fu) displays a maternal effect and is also expressed later in development. Although Su(fu)(LP) is a complete loss-of-function mutation, it is homozygous viable and has no phenotype by itself. Su(fu) fully suppresses the embryonic and adult phenotypes of fu mutants. Su(fu) mutations are semidominant and a Su(fu)(+) duplication has an opposite effect, enhancing the fused phenotype. It is proposed therefore that the Su(fu)(+) product is involved in the same developmental step as the Fu(+) kinase. Thus, a new gene interacting with the segment polarity pathway was identified using an indirect approach.


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