[Clinical and genetic characteristics of epilepsy caused by mutations in the PCDH19 gene (OMIM: 300088)]
E L Dadali1, I A Mishina2, A O Borovikov2
1Federal State Budgetary Institution 'Research Centre for Medical Genetics', Moscow, Russia; Pirogov Russian National Research Medical University, Moscow, Russia.
Insights
PCDH19-associated epilepsy in Russian patients shows variable clinical features, with mutations often causing reading frame shifts. Specific "hot spots" in the PCDH19 gene are linked to this early infantile epileptic encephalopathy.
Area of Science:
- Genetics
- Neurology
- Epilepsy Research
Background:
- PCDH19 gene mutations are a known cause of epilepsy.
- Early infantile epileptic encephalopathy type 9 (EIEE9) presents with diverse clinical symptoms.
Purpose of the Study:
- To investigate the clinical and genetic profiles of PCDH19-associated epilepsy in a Russian patient cohort.
- To identify potential mutation hotspots within the PCDH19 gene.
Main Methods:
- Analysis of 16 patients with early epileptic encephalopathies (aged 10 months to 30 years).
- Utilized neurological examinations, exome sequencing, and EEG monitoring.
- Characterized mutation types including duplications, deletions, and nonsense mutations.
Main Results:
- Identified mutations frequently resulted in reading frame shifts or termination codons.
- Observed significant polymorphism in seizure manifestations, irrespective of mutation type or location.
- Six duplications, four single nucleotide deletions, and three nonsense mutations were found.
Conclusions:
- Confirmed the presence of "hot spots" within the PCDH19 gene associated with epilepsy.
- Reiterated the variable clinical presentation of early infantile epileptic encephalopathy type 9.
- Highlighted the importance of genetic analysis in understanding PCDH19-related epilepsy.
Aim:
To analyze clinical and genetic characteristics of PCDH19-associated epilepsy in a sample of patients from the Russian population.
Material And Methods:
The sample of patients with early epileptic encephalopathies included 16 people aged 10 month to 30 years. All patients underwent neurological examination according to standard methods, exome sequencing and EEG monitoring.
Results:
Most of the identified mutations led to a shift in the reading frame or the formation of a termination codon. Six of them were duplications, four were deletions of one nucleotide, and three were nonsense mutations. Consistent with earlier studies, the authors identified the polymorphism of clinical manifestations of seizures that did not depend on the type of mutation and its localization.
Conclusion:
Based on the study of the clinical and genetic characteristics of the patients, the authors conclude that the so-called 'hot spots' are present in the PCDH19 gene, which are more common in the group of patients with mutations in this gene, and that the clinical picture of early infantile epileptic encephalopathy type 9 is variable.
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