neuromusculin, a drosophila gene expressed in peripheral neuronal precursors and muscles, encodes a cell adhesion molecule

Arthur Kania, Pyung Lim Han, Yun Talk Kim, Hugo Bellen

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

To unravel the molecular mechanisms of peripheral nervous system differentiation in Drosophila, we have screened for and identified genes that are expressed in sensory mother cells. Here, we describe a novel gene, neuromusculin (nrm), that is expressed in sensory mother cells and developing muscles. nrm encodes a member of the immunoglobulin superfamily. Immunoblots of Schneider 2 cells transfected with an nrm cDNA indicate that Nrm is present in a membrane-associated form and a secreted form. Cell aggregation assays suggest that Nrm is a homophilic cell adhesion molecule that is secreted or released after proteolysis, a mechanism that to our knowledge has not been described for immunoglobulin-like molecules. Genetic analyses indicate that nrm is an essential gene required for larval viability. We propose that Nrm may play a role as a cell adhesion molecule in clustering cells of the peripheral nervous system, neuronal fasciculation, and/or pathfinding.

Original languageEnglish
Pages (from-to)673-687
Number of pages15
JournalNeuron
Volume11
Issue number4
DOIs
StatePublished - Oct 1993

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