Diagnostic Approach to Genetic Causes of Early-Onset Epileptic Encephalopathy
1Faculty of Medicine, Department of Pediatric Genetics, Dokuz Eylül University, İzmir, Turkey dr.semra@hotmail.com.
Insights
Early-onset epileptic encephalopathies, often treatment-resistant, can stem from genetic mutations. This review outlines a diagnostic approach to identify primary genetic causes for these severe infant seizure disorders.
Area of Science:
- Neuroscience
- Genetics
- Pediatric Neurology
Background:
- Epileptic encephalopathies present with early infantile seizures and epileptiform discharges.
- While often linked to brain defects or metabolic issues, genetic mutations are increasingly recognized as causes, even without family history.
- Common syndromes include Ohtahara syndrome, West syndrome, and Dravet syndrome, frequently resistant to standard treatments.
Purpose of the Study:
- To present a diagnostic strategy for identifying the primary genetic origins of early-onset epileptic encephalopathies.
- To consolidate current knowledge on genes implicated in these severe infant epilepsy syndromes.
Main Methods:
- Review of existing literature on genetic causes of early-onset epileptic encephalopathies.
- Analysis of diagnostic approaches for genetic epilepsy.
Main Results:
- Over 265 epilepsy-associated genes have been identified.
- Specific genes like STXBP1, KCNQ2, and SCN1A are frequently associated with early-onset epileptic encephalopathies.
- Phenotypic descriptions often lack underlying etiological information.
Conclusions:
- Genetic testing is crucial for diagnosing early-onset epileptic encephalopathies.
- A systematic diagnostic approach is needed to uncover the primary genetic causes.
- Understanding genetic underpinnings can guide future therapeutic strategies.
Abstract:
Epileptic encephalopathies are characterized by recurrent clinical seizures and prominent interictal epileptiform discharges seen during the early infantile period. Although epileptic encephalopathies are mostly associated with structural brain defects and inherited metabolic disorders, pathogenic gene mutations may also be involved in the development of epileptic encephalopathies even when no clear genetic inheritance patterns or consanguinity exist. The most common epileptic encephalopathies are Ohtahara syndrome, early myoclonic encephalopathy, epilepsy of infancy with migrating focal seizures, West syndrome and Dravet syndrome, which are usually unresponsive to traditional antiepileptic medication. Many of the diagnoses describe the phenotype of these electroclinical syndromes, but not the underlying causes. To date, approximately 265 genes have been defined in epilepsy and several genes including STXBP1, ARX, SLC25A22, KCNQ2, CDKL5, SCN1A, and PCDH19 have been found to be associated with early-onset epileptic encephalopathies. In this review, we aimed to present a diagnostic approach to primary genetic causes of early-onset epileptic encephalopathies.
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