Biomaterial Database

Islet Coordinately Regulates Motor Axon Guidance and Dendrite Targeting through the Frazzled/DCC Receptor. 2017

Celine Santiago, and Greg J Bashaw

Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.

Motor neuron axon targeting in the periphery is correlated with the positions of motor neuron inputs in the CNS, but how these processes are coordinated to form a myotopic map remains poorly understood. We show that the LIM homeodomain factor Islet (Isl) controls targeting of both axons and dendrites in Drosophila motor neurons through regulation of the Frazzled (Fra)/DCC receptor. Isl is required for fra expression in ventrally projecting motor neurons, and isl and fra mutants have similar axon guidance defects. Single-cell labeling indicates that isl and fra are also required for dendrite targeting in a subset of motor neurons. Finally, overexpression of Fra rescues axon and dendrite targeting defects in isl mutants. These results indicate that Fra acts downstream of Isl in both the periphery and the CNS, demonstrating how a single regulatory relationship is used in multiple cellular compartments to coordinate neural circuit wiring.

UI	MeSH Term	Description	Entries
D009046	Motor Neurons	Neurons which activate MUSCLE CELLS.	Neurons, Motor,Alpha Motorneurons,Motoneurons,Motor Neurons, Alpha,Neurons, Alpha Motor,Alpha Motor Neuron,Alpha Motor Neurons,Alpha Motorneuron,Motoneuron,Motor Neuron,Motor Neuron, Alpha,Motorneuron, Alpha,Motorneurons, Alpha,Neuron, Alpha Motor,Neuron, Motor
D011956	Receptors, Cell Surface	Cell surface proteins that bind signalling molecules external to the cell with high affinity and convert this extracellular event into one or more intracellular signals that alter the behavior of the target cell (From Alberts, Molecular Biology of the Cell, 2nd ed, pp693-5). Cell surface receptors, unlike enzymes, do not chemically alter their ligands.	Cell Surface Receptor,Cell Surface Receptors,Hormone Receptors, Cell Surface,Receptors, Endogenous Substances,Cell Surface Hormone Receptors,Endogenous Substances Receptors,Receptor, Cell Surface,Surface Receptor, Cell
D002490	Central Nervous System	The main information-processing organs of the nervous system, consisting of the brain, spinal cord, and meninges.	Cerebrospinal Axis,Axi, Cerebrospinal,Axis, Cerebrospinal,Central Nervous Systems,Cerebrospinal Axi,Nervous System, Central,Nervous Systems, Central,Systems, Central Nervous
D003712	Dendrites	Extensions of the nerve cell body. They are short and branched and receive stimuli from other NEURONS.	Dendrite
D004330	Drosophila	A genus of small, two-winged flies containing approximately 900 described species. These organisms are the most extensively studied of all genera from the standpoint of genetics and cytology.	Fruit Fly, Drosophila,Drosophila Fruit Flies,Drosophila Fruit Fly,Drosophilas,Flies, Drosophila Fruit,Fly, Drosophila Fruit,Fruit Flies, Drosophila
D000071437	Axon Guidance	The mechanism by which a neuronal process outgrows toward a target led by the GROWTH CONE. Local guidance cues are provided by cell surface proteins that act on the growing axon.	Axon Pathfinding,Axonal Pathfinding,Neural Guidance,Neural Pathfinding,Neurite Guidance,Neuronal Guidance,Neuronal Pathfinding,Pathfinding, Axon
D000075386	Netrin Receptors	Cell surface receptors that bind NETRINS. They typically contain both IMMUNOGLOBULIN DOMAINS and FIBRONECTIN TYPE III DOMAINS and function to mediate CELL MIGRATION and AXON GUIDANCE.	Netrin Receptor,Netrin-1 Receptors,Receptor, Netrin,Netrin 1 Receptors,Receptors, Netrin,Receptors, Netrin-1
D000075389	DCC Receptor	A receptor for NETRIN-1 that contains four membrane distal (N-terminal) Ig-like C2 domains and six membrane proximal (C-terminal) fibronectin type III domains. It is expressed primarily in the nerve axons and differentiated intestinal cells and is required for AXON GUIDANCE, mediating axon attraction of neuronal GROWTH CONES; however, it may also trigger axon repulsion through association with the UNC5 netrin-1 receptor. DCC also induces APOPTOSIS when it is unbound from netrin-1. Deletions of the DCC gene are observed in tumor metastases and the protein is not expressed in undifferentiated COLORECTAL CARCINOMA cells.	DCC Tumor Suppressor Protein,DCC-Netrin-1 Receptor,Deleted in Colorectal Carcinoma Protein,DCC Netrin 1 Receptor,Receptor, DCC,Receptor, DCC-Netrin-1
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D001369	Axons	Nerve fibers that are capable of rapidly conducting impulses away from the neuron cell body.	Axon