title: L1CAM/Neuroglian controls the axon-axon interactions establishing layered and lobular mushroom body architecture.
abstract: The establishment of neuronal circuits depends on the guidance of axons both along and in between axonal populations of different identity; however, the molecular principles controlling axon-axon interactions in vivo remain largely elusive. We demonstrate that the Drosophila melanogaster L1CAM homologue Neuroglian mediates adhesion between functionally distinct mushroom body axon populations to enforce and control appropriate projections into distinct axonal layers and lobes essential for olfactory learning and memory. We addressed the regulatory mechanisms controlling homophilic Neuroglian-mediated cell adhesion by analyzing targeted mutations of extra- and intracellular Neuroglian domains in combination with cell type-specific rescue assays in vivo. We demonstrate independent and cooperative domain requirements: intercalating growth depends on homophilic adhesion mediated by extracellular Ig domains. For functional cluster formation, intracellular Ankyrin2 association is sufficient on one side of the trans-axonal complex whereas Moesin association is likely required simultaneously in both interacting axonal populations. Together, our results provide novel mechanistic insights into cell adhesion molecule-mediated axon-axon interactions that enable precise assembly of complex neuronal circuits.
authors.affiliation: Friedrich Miescher Institute for Biomedical Research, 4058 Basel, Switzerland University of Basel, 4003 Basel, Switzerland.
authors.forename: Dominique
authors.initials: D
authors.lastname: Siegenthaler
authors.affiliation: Friedrich Miescher Institute for Biomedical Research, 4058 Basel, Switzerland University of Basel, 4003 Basel, Switzerland.
authors.forename: Eva-Maria
authors.initials: EM
authors.lastname: Enneking
authors.affiliation: Friedrich Miescher Institute for Biomedical Research, 4058 Basel, Switzerland.
authors.forename: Eliza
authors.initials: E
authors.lastname: Moreno
authors.affiliation: Friedrich Miescher Institute for Biomedical Research, 4058 Basel, Switzerland jan.pielage@fmi.ch.
authors.forename: Jan
authors.initials: J
authors.lastname: Pielage
mesh_terms: D000818:Animals; D017487:Ankyrins / Q000378:metabolism; D001369:Axons / Q000502:physiology; D002448:Cell Adhesion / Q000235:genetics* / Q000502:physiology; D015816:Cell Adhesion Molecules, Neuronal / Q000235:genetics*; D002449:Cell Aggregation / Q000235:genetics / Q000502:physiology; D002460:Cell Line; D065850:Cerebral Peduncle / Q000254:growth & development; D029721:Drosophila Proteins / Q000235:genetics*; D004331:Drosophila melanogaster / Q000254:growth & development*; D018507:Gene Expression Regulation, Developmental; D008568:Memory / Q000502:physiology*; D008840:Microfilament Proteins / Q000378:metabolism; D024521:Mushroom Bodies / Q000254:growth & development*; D039842:Neural Cell Adhesion Molecule L1 / Q000235:genetics; D017434:Protein Structure, Tertiary
chemical_list: D017487:Ankyrins; D015816:Cell Adhesion Molecules, Neuronal; D029721:Drosophila Proteins; D008840:Microfilament Proteins; D039842:Neural Cell Adhesion Molecule L1; C061745:Nrg protein, Drosophila; C071058:moesin
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