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Multiplex families with epilepsy: success of clinical and molecular genetic characterization
- Publication Year :
- 2016
- Publisher :
- United States : Lippincott Williams & Wilkins, 2016.
-
Abstract
- Objective: To analyze the clinical syndromes and inheritance patterns of multiplex families with epilepsy toward the ultimate aim of uncovering the underlying molecular genetic basis. Methods: Following the referral of families with 2 or more relatives with epilepsy, individuals were classified into epilepsy syndromes. Families were classified into syndromes where at least 2 family members had a specific diagnosis. Pedigrees were analyzed and molecular genetic studies were performed as appropriate. Results: A total of 211 families were ascertained over an 11-year period in Israel. A total of 169 were classified into broad familial epilepsy syndrome groups: 61 generalized, 22 focal, 24 febrile seizure syndromes, 33 special syndromes, and 29 mixed. A total of 42 families remained unclassified. Pathogenic variants were identified in 49/211 families (23%). The majority were found in established epilepsy genes (e.g., SCN1A , KCNQ2 , CSTB ), but in 11 families, this cohort contributed to the initial discovery (e.g., KCNT1 , PCDH19 , TBC1D24 ). We expand the phenotypic spectrum of established epilepsy genes by reporting a familial LAMC3 homozygous variant, where the predominant phenotype was epilepsy with myoclonic-atonic seizures, and a pathogenic SCN1A variant in a family where in 5 siblings the phenotype was broadly consistent with Dravet syndrome, a disorder that usually occurs sporadically. Conclusion: A total of 80% of families were successfully classified, with pathogenic variants identified in 23%. The successful characterization of familial electroclinical and inheritance patterns has highlighted the value of studying multiplex families and their contribution towards uncovering the genetic basis of the epilepsies.
- Subjects :
- Male
0301 basic medicine
experimental
Progressive myoclonus epilepsy
Biology
Article
Cohort Studies
03 medical and health sciences
Epilepsy
0302 clinical medicine
Dravet syndrome
Febrile seizure
medicine
Humans
Inheritance Patterns
Family
Genetic Predisposition to Disease
Genetic Testing
Israel
Generalized epilepsy
theoretical
Genetic testing
Genetics
medicine.diagnostic_test
behavioural finance
medicine.disease
ecological finance
Pedigree
030104 developmental biology
Epilepsy syndromes
Female
Neurology (clinical)
030217 neurology & neurosurgery
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....a4ca51c5aaa2a43f9eec02e04d40b1f5