DEVELOPMENTAL ANALYSIS OF THE WING DISC IN THE MUTANT ENGRAILED OF DROSOPHILA MELANOGASTER

A. Garcia-Bellido ¹ and P. Santamaria ¹

¹ Instituto de Genética y Antropología, Centro Investigaciones Biológicas, (C.S.I.C.), Velázquez, 144, Madrid -6

The engrailed (en) mutation leads to the transformation of the posterior structures of the dorsal mesothoracic disc into those characteristic of the anterior region of the same disc. Similar posterior-anterior duplications have been detected in dorsal as well as ventral structures of all the thoracic segments. —Genetic combinations of en with other pattern mutants have shown their synergistic effect on the posterior wing pattern.—A clonal analysis of the en wing disc shows that en affects its development in a characteristic way. The genetic change, by induced mitotic recombination, of en⁺ into en cells is followed by the corresponding transformation, except when it takes place some cell divisions prior to differentiation.—The en posterior wing disc cells show positive affinities with normal anterior wing disc cells in aggregates.—The mode of action of the en⁺ locus controlling wing disc development is discussed.

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