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Essential role for InSyn1 in dystroglycan complex integrity and cognitive behaviors in mice.


ABSTRACT: Human mutations in the dystroglycan complex (DGC) result in not only muscular dystrophy but also cognitive impairments. However, the molecular architecture critical for the synaptic organization of the DGC in neurons remains elusive. Here, we report Inhibitory Synaptic protein 1 (InSyn1) is a critical component of the DGC whose loss alters the composition of the GABAergic synapses, excitatory/inhibitory balance in vitro and in vivo, and cognitive behavior. Association of InSyn1 with DGC subunits is required for InSyn1 synaptic localization. InSyn1 null neurons also show a significant reduction in DGC and GABA receptor distribution as well as abnormal neuronal network activity. Moreover, InSyn1 null mice exhibit elevated neuronal firing patterns in the hippocampus and deficits in fear conditioning memory. Our results support the dysregulation of the DGC at inhibitory synapses and altered neuronal network activity and specific cognitive tasks via loss of a novel component, InSyn1.

SUBMITTER: Uezu A 

PROVIDER: S-EPMC6944460 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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Essential role for InSyn1 in dystroglycan complex integrity and cognitive behaviors in mice.

Uezu Akiyoshi A   Hisey Erin E   Kobayashi Yoshihiko Y   Gao Yudong Y   Bradshaw Tyler Wa TW   Devlin Patrick P   Rodriguiz Ramona R   Tata Purushothama Rao PR   Soderling Scott S  

eLife 20191212


Human mutations in the dystroglycan complex (DGC) result in not only muscular dystrophy but also cognitive impairments. However, the molecular architecture critical for the synaptic organization of the DGC in neurons remains elusive. Here, we report Inhibitory Synaptic protein 1 (InSyn1) is a critical component of the DGC whose loss alters the composition of the GABAergic synapses, excitatory/inhibitory balance in vitro and in vivo, and cognitive behavior. Association of InSyn1 with DGC subunits  ...[more]

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