The key mechanism of interneuron dysfunction in an SCN1A epilepsy mutation is a…

The key mechanism of interneuron dysfunction in an SCN1A epilepsy mutation is a deficit of action potential initiation at the axon initial segment, not changes in somatic Na+ channels, with the deficit increasing with firing duration suggesting enhanced slow inactivation.

{
  "n": 0,
  "doi": "10.1523/jneurosci.0721-14.2014",
  "claim": "The key mechanism of interneuron dysfunction in an SCN1A epilepsy mutation is a deficit of action potential initiation at the axon initial segment, not changes in somatic Na+ channels, with the deficit increasing with firing duration suggesting enhanced slow inactivation.",
  "evidence": "Multisystem analysis of SCN1A R1648H knock-in mice showing ubiquitous interneuron hypoexcitability in thalamus, cortex, and hippocampus without changes in excitatory neurons.",
  "effect_size": "ubiquitous interneuron hypoexcitability across thalamus, cortex, hippocampus; no changes in excitatory neurons",
  "text_access": "abstract_only",
  "study_system": "mouse Nav1.1-R1648H knock-in model, multiple brain regions",
  "replication_status": "independently_replicated",
  "claim_source_sentence": "Instead, the key mechanism of interneuron dysfunction was a deficit of action potential initiation at the axon initial segment that was identified by analyzing action potential firing. This deficit increased with the duration of firing periods.",
  "replication_evidence_dois": [
    "10.1073/pnas.1411131111"
  ],
  "effect_size_source_sentence": "We found a ubiquitous hypoexcitability of interneurons in thalamus, cortex, and hippocampus, without detectable changes in excitatory neurons."
}

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]

Instead, the key mechanism of interneuron dysfunction was a deficit of action potential initiation at the axon initial segment that was identified by analyzing action potential firing. This deficit increased with the duration of firing periods.

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