TY - JOUR
T1 - DISC1 causes associative memory and neurodevelopmental defects in fruit flies
AU - Furukubo-Tokunaga, K.
AU - Kurita, K.
AU - Honjo, K.
AU - Pandey, H.
AU - Ando, T.
AU - Takayama, K.
AU - Arai, Y.
AU - Mochizuki, H.
AU - Ando, M.
AU - Kamiya, A.
AU - Sawa, A.
N1 - Funding Information:
We are grateful to Daisuke Tanaka, Yuya Kawanaka, Yasushi Maruyama, Shinichiro Horigane and Takato Honda for their help in diverse aspects of this study. We also thank Ryusuke Niwa, Satoru Kobayashi, Fuminori Tsuruta, Yoshiki Hayashi and Ryoma Ohta for their help in biochemical analyses. We thank Developmental Studies Hybridoma Bank for antibodies and the Bloomington Stock Center for fly stocks. This study was supported by Grants-in-Aid for Scientific Research, MEXT, Japan, (KF-T) and NIH grants of MH-084018 (AS), MH-094268 Silvo O. Conte center (AS, AK), MH-069853 (AS), MH-085226 (AS), MH-088753 (AS), MH-092443 (AS), MH-091230 (AK), as well as grants from Stanley (AS), S-R (AS), RUSK (AS), NARSAD (AS, AK), JHU-BSI (AS), MSCRF (AS).
Publisher Copyright:
© 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
PY - 2016/9/1
Y1 - 2016/9/1
N2 - Originally found in a Scottish family with diverse mental disorders, the DISC1 protein has been characterized as an intracellular scaffold protein that associates with diverse binding partners in neural development. To explore its functions in a genetically tractable system, we expressed the human DISC1 in fruit flies (Drosophila melanogaster). As in mammalian neurons, DISC1 is localized to diverse subcellular domains of developing fly neurons including the nuclei, axons and dendrites. Overexpression of DISC1 impairs associative memory. Experiments with deletion/mutation constructs have revealed the importance of amino-terminal domain (46-290) for memory suppression whereas carboxyl domain (598-854) and the amino-terminal residues (1-45) including the nuclear localization signal (NLS1) are dispensable. DISC1 overexpression also causes suppression of axonal and dendritic branching of mushroom body neurons, which mediate a variety of cognitive functions in the fly brain. Analyses with deletion/mutation constructs reveal that protein domains 598-854 and 349-402 are both required for the suppression of axonal branching, while amino-terminal domains including NLS1 are dispensable. In contrast, NLS1 was required for the suppression of dendritic branching, suggesting a mechanism involving gene expression. Moreover, domain 403-596 is also required for the suppression of dendritic branching. We also show that overexpression of DISC1 suppresses glutamatergic synaptogenesis in developing neuromuscular junctions. Deletion/mutation experiments have revealed the importance of protein domains 403-596 and 349-402 for synaptic suppression, while amino-terminal domains including NLS1 are dispensable. Finally, we show that DISC1 functionally interacts with the fly homolog of Dysbindin (DTNBP1) via direct protein-protein interaction in developing synapses.
AB - Originally found in a Scottish family with diverse mental disorders, the DISC1 protein has been characterized as an intracellular scaffold protein that associates with diverse binding partners in neural development. To explore its functions in a genetically tractable system, we expressed the human DISC1 in fruit flies (Drosophila melanogaster). As in mammalian neurons, DISC1 is localized to diverse subcellular domains of developing fly neurons including the nuclei, axons and dendrites. Overexpression of DISC1 impairs associative memory. Experiments with deletion/mutation constructs have revealed the importance of amino-terminal domain (46-290) for memory suppression whereas carboxyl domain (598-854) and the amino-terminal residues (1-45) including the nuclear localization signal (NLS1) are dispensable. DISC1 overexpression also causes suppression of axonal and dendritic branching of mushroom body neurons, which mediate a variety of cognitive functions in the fly brain. Analyses with deletion/mutation constructs reveal that protein domains 598-854 and 349-402 are both required for the suppression of axonal branching, while amino-terminal domains including NLS1 are dispensable. In contrast, NLS1 was required for the suppression of dendritic branching, suggesting a mechanism involving gene expression. Moreover, domain 403-596 is also required for the suppression of dendritic branching. We also show that overexpression of DISC1 suppresses glutamatergic synaptogenesis in developing neuromuscular junctions. Deletion/mutation experiments have revealed the importance of protein domains 403-596 and 349-402 for synaptic suppression, while amino-terminal domains including NLS1 are dispensable. Finally, we show that DISC1 functionally interacts with the fly homolog of Dysbindin (DTNBP1) via direct protein-protein interaction in developing synapses.
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U2 - 10.1038/mp.2016.15
DO - 10.1038/mp.2016.15
M3 - Article
C2 - 26976042
AN - SCOPUS:84961231206
VL - 21
SP - 1232
EP - 1243
JO - Molecular Psychiatry
JF - Molecular Psychiatry
SN - 1359-4184
IS - 9
ER -