Drosophila miR-87 promotes dendrite regeneration by targeting the transcriptional repressor Tramtrack69


Autoři: Yasuko Kitatani aff001;  Akane Tezuka aff001;  Eri Hasegawa aff001;  Satoyoshi Yanagi aff001;  Kazuya Togashi aff001;  Masato Tsuji aff001;  Shu Kondo aff002;  Jay Z. Parrish aff003;  Kazuo Emoto aff001
Působiště autorů: Department of Biological Sciences, Graduate School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, Japan aff001;  Genetic Strains Research Center, National Institute of Genetics, Yata, Mishima, Shizuoka, Japan aff002;  Department of Biology, University of Washington, Seattle, Washington, United States of America aff003;  International Research Center for Neurointelligence (WPI-IRCN), University of Tokyo, Hongo, Bunkyo-ku, Tokyo, Japan aff004
Vyšlo v časopise: Drosophila miR-87 promotes dendrite regeneration by targeting the transcriptional repressor Tramtrack69. PLoS Genet 16(8): e32767. doi:10.1371/journal.pgen.1008942
Kategorie: Research Article
doi: 10.1371/journal.pgen.1008942

Souhrn

To remodel functional neuronal connectivity, neurons often alter dendrite arbors through elimination and subsequent regeneration of dendritic branches. However, the intrinsic mechanisms underlying this developmentally programmed dendrite regeneration and whether it shares common machinery with injury-induced regeneration remain largely unknown. Drosophila class IV dendrite arborization (C4da) sensory neurons regenerate adult-specific dendrites after eliminating larval dendrites during metamorphosis. Here we show that the microRNA miR-87 is a critical regulator of dendrite regeneration in Drosophila. miR-87 knockout impairs dendrite regeneration after developmentally-programmed pruning, whereas miR-87 overexpression in C4da neurons leads to precocious initiation of dendrite regeneration. Genetic analyses indicate that the transcriptional repressor Tramtrack69 (Ttk69) is a functional target for miR-87-mediated repression as ttk69 expression is increased in miR-87 knockout neurons and reducing ttk69 expression restores dendrite regeneration to mutants lacking miR-87 function. We further show that miR-87 is required for dendrite regeneration after acute injury in the larval stage, providing a mechanistic link between developmentally programmed and injury-induced dendrite regeneration. These findings thus indicate that miR-87 promotes dendrite regrowth during regeneration at least in part through suppressing Ttk69 in Drosophila sensory neurons and suggest that developmental and injury-induced dendrite regeneration share a common intrinsic mechanism to reactivate dendrite growth.

Klíčová slova:

Developmental neuroscience – Larvae – MicroRNAs – Neuronal dendrites – Neurons – Sensory perception – Nerve regeneration – Regeneration


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