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Title: Receptor tyrosine phosphatases regulate axon guidance across the midline of the Drosophila embryo
Authors: Sun, Q.
Bahri, S. 
Schmid, A.
Chia, W. 
Zinn, K.
Keywords: Axon guidance
Drosophila melanogaster
Drosophila neurogenetics
Growth cone repulsion
Neural development
Receptor tyrosine phosphatase
Tyrosine phosphorylation
Issue Date: Feb-2000
Source: Sun, Q.,Bahri, S.,Schmid, A.,Chia, W.,Zinn, K. (2000-02). Receptor tyrosine phosphatases regulate axon guidance across the midline of the Drosophila embryo. Development 127 (4) : 801-812. ScholarBank@NUS Repository.
Abstract: Neural receptor-linked protein tyrosine phosphatases (RPTPs) are required for guidance of motoneuron and photoreceptor growth cones in Drosophila. These phosphatases have not been implicated in growth cone responses to specific guidance cues, however, so it is unknown which aspects of axonal pathfinding are controlled by their activities. Three RPTPs, known as DLAR, DPTP69D, and DPTP99A, have been genetically characterized thus far. Here we report the isolation of mutations in the fourth neural RPTP, DPTP10D. The analysis of double mutant phenotypes shows that DPTP10D and DPTP69D are necessary for repulsion of growth cones from the midline of the embryonic central nervous system. Repulsion is thought to be triggered by binding of the secreted protein Slit, which is expressed by midline glia, to Roundabout (Robo) receptors on growth cones. Robo repulsion is downregulated by the Commissureless (Comm) protein, allowing axons to cross the midline. Here we show that the Rptp mutations genetically interact with robo, slit and comm. The nature of these interactions suggests that DPTP10D and DPTP69D are positive regulators of Slit/Roundabout repulsive signaling. We also show that elimination of all four neural RPTPs converts most noncrossing longitudinal pathways into commissures that cross the midline, indicating that tyrosine phosphorylation controls the manner in which growth cones respond to midline signals.
Source Title: Development
ISSN: 09501991
Appears in Collections:Staff Publications

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