title: Integrins regulate repulsion-mediated dendritic patterning of drosophila sensory neurons by restricting dendrites in a 2D space.
abstract: Dendrites of the same neuron usually avoid each other. Some neurons also repel similar neurons through dendrite-dendrite interaction to tile the receptive field. Nonoverlapping coverage based on such contact-dependent repulsion requires dendrites to compete for limited space. Here we show that Drosophila class IV dendritic arborization (da) neurons, which tile the larval body wall, grow their dendrites mainly in a 2D space on the extracellular matrix (ECM) secreted by the epidermis. Removing neuronal integrins or blocking epidermal laminin production causes dendrites to grow into the epidermis, suggesting that integrin-laminin interaction attaches dendrites to the ECM. We further show that some of the previously identified tiling mutants fail to confine dendrites in a 2D plane. Expansion of these mutant dendrites in three dimensions results in overlap of dendritic fields. Moreover, overexpression of integrins in these mutant neurons effectively reduces dendritic crossing and restores tiling, revealing an additional mechanism for tiling.
authors.affiliation: Howard Hughes Medical Institute, Departments of Physiology, Biochemistry, and Biophysics, University of California, San Francisco, San Francisco, CA 94158, USA.
authors.forename: Chun
authors.initials: C
authors.lastname: Han
authors.forename: Denan
authors.initials: D
authors.lastname: Wang
authors.forename: Peter
authors.initials: P
authors.lastname: Soba
authors.forename: Sijun
authors.initials: S
authors.lastname: Zhu
authors.forename: Xinhua
authors.initials: X
authors.lastname: Lin
authors.forename: Lily Yeh
authors.initials: LY
authors.lastname: Jan
authors.forename: Yuh-Nung
authors.initials: YN
authors.lastname: Jan
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D003001:Cloning, Molecular; D003712:Dendrites / Q000502:physiology* / Q000648:ultrastructure; D004330:Drosophila; D029721:Drosophila Proteins / Q000235:genetics; D004625:Embryo, Nonmammalian; D005109:Extracellular Matrix / Q000502:physiology; D018507:Gene Expression Regulation, Developmental / Q000235:genetics / Q000502:physiology*; D016023:Integrins / Q000235:genetics / Q000502:physiology*; D007797:Laminin / Q000378:metabolism; D046529:Microscopy, Electron, Transmission; D009154:Mutation / Q000235:genetics; D059906:Neuroimaging; D034622:RNA Interference; D012679:Sense Organs / Q000166:cytology; D011984:Sensory Receptor Cells / Q000166:cytology* / Q000378:metabolism; D015398:Signal Transduction
chemical_list: D029721:Drosophila Proteins; D016023:Integrins; D007797:Laminin