Eph Receptor Effector Ephexin Mediates Olfactory Dendrite Targeting in Drosophila

Developmental Neurobiology
Juhi SardanaIlona C Grunwald Kadow

Abstract

Deciphering the mechanisms of sensory neural map formation is a central aim in neurosciences. Failure to form a correct map frequently leads to defects in sensory processing and perception. The olfactory map develops in subsequent steps initially forming a rough and later a precise map of glomeruli in the antennal lobe (AL), mainly consisting of olfactory receptor neuron (ORN) axons and projection neuron (PN) dendrites. The mechanisms underpinning the later stage of class-specific glomerulus formation are not understood. Recent studies have shown that the important guidance molecule Eph and its ligand ephrin play a role in class-specific PN targeting. Here, we reveal aspects of the mechanism downstream of Eph signaling during olfactory map formation. We show that the Eph-specific RhoGEF Ephexin (Exn) is required to fine tune PN dendrite patterning within specific glomeruli. We provide the first report showing an in vivo neurite guidance defect in an exn mutant. Interestingly, the quality of the phenotypes is different between eph and exn mutants; while loss of Eph leads to strong misprojections of DM3/Or47a neurons along the medial-lateral axis of the antennal lobe (AL), loss of Exn induces ventral ectopic innervation of a neig...Continue Reading

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Citations

Jan 27, 2019·Cells·Kwanhyeong KimDaeho Park
Feb 26, 2020·Nature Communications·Aarush Mohit MittalNitin Gupta
Jun 20, 2020·Current Biology : CB·Anna R RybaDaniel J C Kronauer

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