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Updated: Jul 25, 2025

A Behavioral Screen for Heat-Induced Seizures in Mouse Models of Epilepsy
Published on: July 12, 2021
The HCN1 p.Ser399Pro variant causes epileptic encephalopathy with super-refractory status epilepticus
Yu Kobayashi1, Jun Tohyama2, Noriyuki Akasaka3
1Department of Child Neurology, National Hospital Organization Nishiniigata Chuo Hospital, Niigata, Japan.
Abstract:
HCN1 is one of four genes encoding hyperpolarization-activated cyclic nucleotide-gated channels. The phenotypic spectrum associated with HCN1 variants ranges from neonatal developmental and epileptic encephalopathy to idiopathic generalized epilepsy. We report a Japanese patient with repetitive focal seizures and super-refractory status epilepticus since early infancy caused by a de novo HCN1 variant, NM_021072.4, c.1195T>C, p.(Ser399Pro). This variant might have a dominant-negative effect on channel function, leading to severe epileptic encephalopathy.
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