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  • Title: Borderless regulates glial extension and axon ensheathment.
    Author: Cameron S, Chen Y, Rao Y.
    Journal: Dev Biol; 2016 Jun 15; 414(2):170-80. PubMed ID: 27131624.
    Abstract:
    Ensheathment of axons by glial processes is essential for normal brain function. While considerable progress has been made to define molecular and cellular mechanisms underlying the maintenance of axon ensheathment, less is known about molecular details of early events for the wrapping of axons by glial processes in the developing nervous system. In this study, we investigate the role of the transmembrane protein Borderless (Bdl) in the developing Drosophila visual system. Bdl belongs to the immunoglobulin (Ig) superfamily, and its in vivo function is unknown. We show that Bdl is expressed in wrapping glia (WG) in the developing eye disc. Cell-type-specific transgene rescue and knockdown indicate that Bdl is specifically required in WG for the extension of glial processes along photoreceptor axons in the optic lobe, and axon ensheathment. Our results identify Bdl as a novel glia-specific cell-surface recognition molecule in regulating glial extension and axon ensheathment.
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