Abstract:
:Synaptic inhibition is essential for shaping the dynamics of neuronal networks, and aberrant inhibition plays an important role in neurological disorders. Gephyrin is a central player at inhibitory postsynapses, directly binds and organizes GABAA and glycine receptors (GABAARs and GlyRs), and is thereby indispensable for normal inhibitory neurotransmission. Additionally, gephyrin catalyzes the synthesis of the molybdenum cofactor (MoCo) in peripheral tissue. We identified a de novo missense mutation (G375D) in the gephyrin gene (GPHN) in a patient with epileptic encephalopathy resembling Dravet syndrome. Although stably expressed and correctly folded, gephyrin-G375D was non-synaptically localized in neurons and acted dominant-negatively on the clustering of wild-type gephyrin leading to a marked decrease in GABAAR surface expression and GABAergic signaling. We identified a decreased binding affinity between gephyrin-G375D and the receptors, suggesting that Gly375 is essential for gephyrin-receptor complex formation. Surprisingly, gephyrin-G375D was also unable to synthesize MoCo and activate MoCo-dependent enzymes. Thus, we describe a missense mutation that affects both functions of gephyrin and suggest that the identified defect at GABAergic synapses is the mechanism underlying the patient's severe phenotype.
journal_name
EMBO Mol Medjournal_title
EMBO molecular medicineauthors
Dejanovic B,Djémié T,Grünewald N,Suls A,Kress V,Hetsch F,Craiu D,Zemel M,Gormley P,Lal D,EuroEPINOMICS Dravet working group.,Myers CT,Mefford HC,Palotie A,Helbig I,Meier JC,De Jonghe P,Weckhuysen S,Schwarz Gdoi
10.15252/emmm.201505323subject
Has Abstractpub_date
2015-12-01 00:00:00pages
1580-94issue
12eissn
1757-4676issn
1757-4684pii
emmm.201505323journal_volume
7pub_type
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