U.S. flag

An official website of the United States government

GTR Home > Conditions/Phenotypes > Severe myoclonic epilepsy in infancy

Severe myoclonic epilepsy in infancy

Synonyms
DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 6A; Dravet syndrome; Epilepsy, Myoclonic, Infantile, Severe; Epileptic encephalopathy, early infantile, 6 (Dravet syndrome)
Modes of inheritance
Autosomal dominant inheritance (Orphanet)

Summary

Excerpted from the GeneReview: SCN1A Seizure Disorders
SCN1A seizure disorders encompass a spectrum that ranges from simple febrile seizures and generalized epilepsy with febrile seizures plus (GEFS+) at the mild end to Dravet syndrome and intractable childhood epilepsy with generalized tonic-clonic seizures (ICE-GTC) at the severe end. Phenotypes with intractable seizures including Dravet syndrome are often associated with cognitive decline. Less commonly observed phenotypes include myoclonic astatic epilepsy (MAE), Lennox-Gastaut syndrome, infantile spasms, epilepsy with focal seizures, and vaccine-related encephalopathy and seizures. The phenotype of SCN1A seizure disorders can vary even within the same family.
Full text of GeneReview (by section):
Summary
GeneReview Scope
Diagnosis
Clinical Characteristics
Genetically Related (Allelic) Disorders
Differential Diagnosis
Management
Genetic Counseling
Resources
Molecular Genetics
Chapter Notes
References
Authors:
Ian O Miller
Marcio A Sotero de Menezes
view full author information

Available tests

110 tests are in the database for this condition.

Check Related conditions for additional relevant tests.

Clinical tests (110 available)

Molecular Genetics Tests

Genes See tests for all associated and related genes

  • Also known as: DEE6, DEE6A, DEE6B, DRVT, EIEE6, FEB3, FEB3A, FHM3, GEFSP2, HBSCI, NAC1, Nav1.1, SCN1, SMEI, SCN1A
    Summary: sodium voltage-gated channel alpha subunit 1

Clinical features

Help
Imported from Human Phenotype Ontology (HPO)

Show allHide all

IMPORTANT NOTE: NIH does not independently verify information submitted to the GTR; it relies on submitters to provide information that is accurate and not misleading. NIH makes no endorsements of tests or laboratories listed in the GTR. GTR is not a substitute for medical advice. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.