The transmembrane tyrosine phosphatase DLAR controls motor axon guidance in Drosophila

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Abstract

DLAR is a receptor-like, transmembrane protein-tyrosine phosphatase in Drosophila that is expressed almost exclusively by developing neurons. Analysis of Dlar loss-of-function mutations shows that DLAR plays a key role during motoneuron growth cone guidance. Segmental nerve b (SNb) motor axons normally exit the common motor pathway, enter the ventral target region, and then synapse on specific ventral muscles. In Dlar mutant embryos, SNb axons bypass their normal target region and instead continue to extend along the common pathway. SNd motor axons also make path finding errors, while SNa and SNc axOhS appear normal. Thus, DLAR controls the ability of certain motor axons to navigate specific choice points in the developing Drosophila nervous system.

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Krueger, N. X., Van Vactor, D., Wan, H. I., Gelbart, W. M., Goodman, C. S., & Saito, H. (1996). The transmembrane tyrosine phosphatase DLAR controls motor axon guidance in Drosophila. Cell, 84(4), 611–622. https://doi.org/10.1016/S0092-8674(00)81036-3

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