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Genetics, Vol 126, 139-155, Copyright © 1990
INVESTIGATIONS |
Developmental Genetic Analysis of Contrabithorax Mutations in Drosophila melanogaster
M. A. Gonzalez-Gaitan, J. L. Micol and A. Garcia-Bellido
Centro de Biologia Molecular, C.S.I.C., Universidad Autonoma de Madrid, 28049 Madrid, Spain
A developmental analysis of the Contrabithorax (Cbx) alleles offers the opportunity to examine the role of the Ultrabithorax (Ubx) gene in controlling haltere, as alternative to wing, morphogenesis in Drosophila. Several Cbx alleles are known with different spatial specificity in their wing toward haltere homeotic transformation. The molecular data on these mutations, however, does not readily explain differences among mutant phenotypes. In this work, we have analyzed the ``apogenetic'' mosaic spots of transformation in their adult phenotype, in mitotic recombination clones and in the spatial distribution of Ubx proteins in imaginal discs. The results suggest that the phenotypes emerge from early clonality in some Cbx alleles, and from cell-cell interactions leading to recruitment of cells to Ubx gene expression in others. We have found, in addition, mutual interactions between haltere and wing territories in pattern and dorsoventral symmetries, suggesting short distance influences, ``accommodation,'' during cell proliferation of the anlage. These findings are considered in an attempt to explain allele specificity in molecular and developmental terms.
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