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DISC1 regulates N-methyl-D-aspartate receptor dynamics: abnormalities induced by a Disc1 mutation modelling a translocation linked to major mental illness

Research output: Contribution to journalArticle

Elise L.V. Malavasi, Kyriakos D. Economides, Ellen Grünewald, Paraskevi Makedonopoulou, Philippe Gautier, Shaun Mackie, Laura C. Murphy, Hannah Murdoch, Darragh Crummie, Fumiaki Ogawa, Daniel L. McCartney, Shane T. O’Sullivan, Karen Burr, Helen S. Torrance, Jonathan Phillips, Marion Bonneau, Susan M. Anderson, Paul Perry, Matthew Pearson, Costas Constantinides & 16 more Hazel Davidson-Smith, Mostafa Kabiri, Barbara Duff, Mandy Johnstone, H. Greg Polites, Stephen M. Lawrie, Douglas H. Blackwood, Colin A. Semple, Kathryn L. Evans, Michel Didier, Siddharthan Chandran, Andrew M. McIntosh, David J. Price, Miles D. Houslay, David J. Porteous, J. Kirsty Millar

Original languageEnglish
Article number184
JournalTranslational psychiatry
Volume8
Issue number1
Early online date6 Sep 2018
DOIs
Accepted/In press16 Jul 2018
E-pub ahead of print6 Sep 2018
Published1 Dec 2018

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Abstract

The neuromodulatory gene DISC1 is disrupted by a t(1;11) translocation that is highly penetrant for schizophrenia and affective disorders, but how this translocation affects DISC1 function is incompletely understood. N-methyl-D-aspartate receptors (NMDAR) play a central role in synaptic plasticity and cognition, and are implicated in the pathophysiology of schizophrenia through genetic and functional studies. We show that the NMDAR subunit GluN2B complexes with DISC1-associated trafficking factor TRAK1, while DISC1 interacts with the GluN1 subunit and regulates dendritic NMDAR motility in cultured mouse neurons. Moreover, in the first mutant mouse that models DISC1 disruption by the translocation, the pool of NMDAR transport vesicles and surface/synaptic NMDAR expression are increased. Since NMDAR cell surface/synaptic expression is tightly regulated to ensure correct function, these changes in the mutant mouse are likely to affect NMDAR signalling and synaptic plasticity. Consistent with these observations, RNASeq analysis of the translocation carrier-derived human neurons indicates abnormalities of excitatory synapses and vesicle dynamics. RNASeq analysis of the human neurons also identifies many differentially expressed genes previously highlighted as putative schizophrenia and/or depression risk factors through large-scale genome-wide association and copy number variant studies, indicating that the translocation triggers common disease pathways that are shared with unrelated psychiatric patients. Altogether, our findings suggest that translocation-induced disease mechanisms are likely to be relevant to mental illness in general, and that such disease mechanisms include altered NMDAR dynamics and excitatory synapse function. This could contribute to the cognitive disorders displayed by translocation carriers.

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