Related Experiment Videos
Familial neonatal and infantile seizures: an autosomal-dominant disorder
Insights
Familial neonatal seizures present in healthy infants within days of birth and typically resolve by six months. This autosomal-dominant disorder shows normal diagnostics but may lead to later seizures in 11% of cases.
Area of Science:
- Genetics
- Neurology
- Pediatrics
Background:
- Familial neonatal seizures (FNS) are an underrecognized genetic epilepsy syndrome.
- Understanding the clinical spectrum and inheritance patterns of FNS is crucial for diagnosis and management.
Purpose of the Study:
- To characterize the clinical presentation and inheritance of familial neonatal seizures.
- To compare findings with previously reported cases to establish a typical phenotype.
- To evaluate the long-term neurodevelopmental outcome and seizure recurrence in affected individuals.
Main Methods:
- Clinical evaluation of a family with six affected individuals across three generations.
- Literature review and comparative analysis of 116 affected individuals from 15 reported families.
- Assessment of diagnostic evaluations and long-term neurodevelopmental outcomes.
Main Results:
- A consistent clinical picture of FNS emerged: onset within 2-8 days of life in healthy infants, with seizure cessation by 1-6 months.
- Diagnostic evaluations were consistently normal, with unclear pathogenesis.
- Long-term outcome was generally normal, but 11% experienced recurrent seizures later in life.
Conclusions:
- Familial neonatal seizures are inherited as an autosomal-dominant trait with high penetrance.
- The disorder is characterized by early-onset, self-limiting seizures and a generally favorable neurodevelopmental outcome.
- Further research is needed to elucidate the underlying pathogenesis of FNS.
Abstract:
Familial neonatal seizures are an important and probably underrecognized disorder. A family with six affected individuals in three generations was evaluated and their clinical characteristics were compared with those of 15 families previously reported in the literature. An analysis of the 116 affected individuals uncovered a typical clinical picture of onset of seizures by 2 to 8 days of life in an otherwise healthy appearing infant, and cessation of seizures by 1 to 6 months. Results of diagnostic evaluations were normal, and the pathogenesis of the disorder is still unclear. Long-term neurodevelopmental outcome was normal except for an increased rate (11%) of subsequent seizures in childhood or as an adult. The disorder was inherited as an autosomal-dominant trait with a high degree of penetrance.