Abstract:
:Gephyrin is a postsynaptic scaffolding protein, essential for the clustering of glycine and γ-aminobutyric acid type-A receptors (GABAARs) at inhibitory synapses. An impairment of GABAergic synaptic inhibition represents a key pathway of epileptogenesis. Recently, exonic microdeletions in the gephyrin (GPHN) gene have been associated with neurodevelopmental disorders including autism spectrum disorder, schizophrenia and epileptic seizures. Here we report the identification of novel exonic GPHN microdeletions in two patients with idiopathic generalized epilepsy (IGE), representing the most common group of genetically determined epilepsies. The identified GPHN microdeletions involve exons 5-9 (Δ5-9) and 2-3 (Δ2-3), both affecting the gephyrin G-domain. Molecular characterization of the GPHN Δ5-9 variant demonstrated that it perturbs the clustering of regular gephyrin at inhibitory synapses in cultured mouse hippocampal neurons in a dominant-negative manner, resulting in a significant loss of γ2-subunit containing GABAARs. GPHN Δ2-3 causes a frameshift resulting in a premature stop codon (p.V22Gfs*7) leading to haplo-insufficiency of the gene. Our results demonstrate that structural exonic microdeletions affecting the GPHN gene constitute a rare genetic risk factor for IGE and other neuropsychiatric disorders by an impairment of the GABAergic inhibitory synaptic transmission.
journal_name
Neurobiol Disjournal_title
Neurobiology of diseaseauthors
Dejanovic B,Lal D,Catarino CB,Arjune S,Belaidi AA,Trucks H,Vollmar C,Surges R,Kunz WS,Motameny S,Altmüller J,Köhler A,Neubauer BA,Epicure Consortium,Nürnberg P,Noachtar S,Schwarz G,Sander Tdoi
10.1016/j.nbd.2014.02.001subject
Has Abstractpub_date
2014-07-01 00:00:00pages
88-96eissn
0969-9961issn
1095-953Xpii
S0969-9961(14)00036-9journal_volume
67pub_type
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