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Genetics, Vol. 155, 733-752, June 2000, Copyright © 2000

A Gain-of-Function Screen for Genes That Affect the Development of the Drosophila Adult External Sensory Organ

Salim Abdelilah-Seyfrieda, Yee-Ming Chana, Chaoyang Zengb, Nicholas J. Justicea, Susan Younger-Shepherda, Linda E. Sharpa, Sandra Barbela, Sarah A. Meadowsa, Lily Yeh Jana, and Yuh Nung Jana
a Howard Hughes Medical Institute, Departments of Physiology and Biochemistry, University of California, San Francisco, California 94143-0725
b Department of Biological Sciences, University of Wisconsin, Milwaukee, Wisconsin 53201

Corresponding author: Yuh Nung Jan, Howard Hughes Medical Institute, Departments of Physiology and Biochemistry, Third and Parnassus Ave., University of California, San Francisco, CA 94143-0725., ynjan{at}itsa.ucsf.edu (E-mail)

Communicating editor: T. SCHÜPBACH

The Drosophila adult external sensory organ, comprising a neuron and its support cells, is derived from a single precursor cell via several asymmetric cell divisions. To identify molecules involved in sensory organ development, we conducted a tissue-specific gain-of-function screen. We screened 2293 independent P-element lines established by P. Rørth and identified 105 lines, carrying insertions at 78 distinct loci, that produced misexpression phenotypes with changes in number, fate, or morphology of cells of the adult external sensory organ. On the basis of the gain-of-function phenotypes of both internal and external support cells, we subdivided the candidate lines into three classes. The first class (52 lines, 40 loci) exhibits partial or complete loss of adult external sensory organs. The second class (38 lines, 28 loci) is associated with increased numbers of entire adult external sensory organs or subsets of sensory organ cells. The third class (15 lines, 10 loci) results in potential cell fate transformations. Genetic and molecular characterization of these candidate lines reveals that some loci identified in this screen correspond to genes known to function in the formation of the peripheral nervous system, such as big brain, extra macrochaetae, and numb. Also emerging from the screen are a large group of previously uncharacterized genes and several known genes that have not yet been implicated in the development of the peripheral nervous system.




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