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Journal of Neuroscience, Vol 14, 3166-3179, Copyright © 1994 by Society for Neuroscience
bendless, a Drosophila gene affecting neuronal connectivity, encodes a ubiquitin-conjugating enzyme homolog
CE Oh, R McMahon, S Benzer and MA Tanouye
Department of Entomology and Parasitology, University of California at Berkeley 94720.
The Drosophila bendless (ben) gene was originally isolated as a mutation
affecting the escape jump response. This behavioral defect was ascribed to
a single lesion affecting the connectivity between the giant fiber and the
tergotrochanter motor neuron. A closer examination of the ben phenotype
suggests that ben activity is broader and affects a variety of other
neurons including photoreceptor cells and their axons. Mosaic analysis
indicates that the focus of ben activity is presynaptic. We have cloned the
ben gene through a chromosomal walk and show that it is homologous to a
class of ubiquitin-conjugating enzymes. The major role of ubiquitination in
the protein degradative pathway suggests that ben regulates neural
developmental processes such as growth cone guidance by targeting specific
proteins for degradation.
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