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Slitrk Missense Mutations Associated with Neuropsychiatric Disorders Distinctively Impair Slitrk Trafficking and Synapse Formation

Authors
 Hyeyeon Kang  ;  Kyung Ah Han  ;  Seoung Youn Won  ;  Ho Min Kim  ;  Young-Ho Lee  ;  Jaewon Ko  ;  Ji Won Um 
Citation
 FRONTIERS IN MOLECULAR NEUROSCIENCE, Vol.9 : 104, 2016 
Journal Title
 FRONTIERS IN MOLECULAR NEUROSCIENCE 
Issue Date
2016
Keywords
Slitrks ; Tourette’s Syndrome ; schizophrenia ; synapse formation ; transmembrane protein
Abstract
Slit- and Trk-like (Slitrks) are a six-member family of synapse organizers that control excitatory and inhibitory synapse formation by forming trans-synaptic adhesions with LAR receptor protein tyrosine phosphatases (PTPs). Intriguingly, genetic mutations of Slitrks have been associated with a multitude of neuropsychiatric disorders. However, nothing is known about the neuronal and synaptic consequences of these mutations. Here, we report the structural and functional effects on synapses of various rare de novo mutations identified in patients with schizophrenia or Tourette syndrome. A number of single amino acid substitutions in Slitrk1 (N400I or T418S) or Slitrk4 (V206I or I578V) reduced their surface expression levels. These substitutions impaired glycosylation of Slitrks expressed in HEK293T cells, caused retention of Slitrks in the endoplasmic reticulum and cis-Golgi compartment in COS-7 cells and neurons, and abolished Slitrk binding to PTPδ. Furthermore, these substitutions eliminated the synapse-inducing activity of Slitrks, abolishing their functional effects on synapse density in cultured neurons. Strikingly, a valine-to-methionine mutation in Slitrk2 (V89M) compromised synapse formation activity in cultured neuron, without affecting surface transport, expression, or synapse-inducing activity in coculture assays. Similar deleterious effects were observed upon introduction of the corresponding valine-to-methionine mutation into Slitrk1 (V85M), suggesting that this conserved valine residue plays a key role in maintaining the synaptic functions of Slitrks. Collectively, these data indicate that inactivation of distinct cellular mechanisms caused by specific Slitrk dysfunctions may underlie Slitrk-associated neuropsychiatric disorders in humans, and provide a robust cellular readout for the development of knowledge-based therapies.
Files in This Item:
T201604436.pdf Download
DOI
10.3389/fnmol.2016.00104
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Physiology (생리학교실) > 1. Journal Papers
Yonsei Authors
Um, Ji Won(엄지원)
Lee, Young Ho(이영호) ORCID logo https://orcid.org/0000-0002-5749-1045
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/152452
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