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  • Title: The Caenorhabditis elegans Ephrin EFN-4 Functions Non-cell Autonomously with Heparan Sulfate Proteoglycans to Promote Axon Outgrowth and Branching.
    Author: Schwieterman AA, Steves AN, Yee V, Donelson CJ, Bentley MR, Santorella EM, Mehlenbacher TV, Pital A, Howard AM, Wilson MR, Ereddia DE, Effrein KS, McMurry JL, Ackley BD, Chisholm AD, Hudson ML.
    Journal: Genetics; 2016 Feb; 202(2):639-60. PubMed ID: 26645816.
    Abstract:
    The Eph receptors and their cognate ephrin ligands play key roles in many aspects of nervous system development. These interactions typically occur within an individual tissue type, serving either to guide axons to their terminal targets or to define boundaries between the rhombomeres of the hindbrain. We have identified a novel role for the Caenorhabditis elegans ephrin EFN-4 in promoting primary neurite outgrowth in AIY interneurons and D-class motor neurons. Rescue experiments reveal that EFN-4 functions non-cell autonomously in the epidermis to promote primary neurite outgrowth. We also find that EFN-4 plays a role in promoting ectopic axon branching in a C. elegans model of X-linked Kallmann syndrome. In this context, EFN-4 functions non-cell autonomously in the body-wall muscle and in parallel with HS modification genes and HSPG core proteins. This is the first report of an epidermal ephrin providing a developmental cue to the nervous system.
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