Four generations of epilepsy caused by an inherited microdeletion of the SCN1A gene
| Autor: | Liesbet Deprez, Reana Velizarova, Arvid Suls, Jan Wauters, Albena Jordanova, Ivo Kremensky, P. De Jonghe, Velina Guergueltcheva, L Claes, T Van Dyck, Iglika Yordanova |
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| Rok vydání: | 2010 |
| Předmět: |
Adult
Male Proband Nerve Tissue Proteins Biology Severity of Illness Index Sodium Channels Epilepsy Dravet syndrome Intellectual Disability medicine Humans Copy-number variation Gene Genetics Point mutation Infant Middle Aged Amplicon medicine.disease Pedigree NAV1.1 Voltage-Gated Sodium Channel Female Human medicine Neurology (clinical) Haploinsufficiency Gene Deletion |
| Zdroj: | Neurology |
| ISSN: | 1526-632X 0028-3878 |
| DOI: | 10.1212/wnl.0b013e3181e62088 |
| Popis: | Objectives: The aim of this study was to determine the genetic defect in a 4-generational family with an epileptic disorder characterized by febrile and afebrile polymorphic seizures and mild to severe mental retardation by means of analyzing the neuronal voltage-gated sodium channel α-subunit gene SCN1A for mutations. Methods: A Bulgarian family was ascertained and clinically assessed, followed by mutation analysis of the SCN1A gene using direct sequencing to detect point mutations and multiplex amplicon quantification to identify copy number variations. Results: A microdeletion encompassing the entire SCN1A gene segregating with all affected members was identified in this family. Additional analysis showed that the unaffected father of the proband is mosaic for the deletion. So far, SCN1A deletions, predicted to lead to haploinsufficiency, are exclusively identified in isolated patients with Dravet or contiguous gene syndromes. Because of the severe phenotype, SCN1A deletion carriers are usually not able to live independently and start a family, and hence do not transmit the disease. Conclusions: We report an inherited SCN1A gene deletion not exclusively associated with Dravet syndrome. Moreover, our results demonstrate that SCN1A haploinsufficiency can cause a significant intrafamilial clinical variability including moderately affected to syndromal patients. The involvement of multiple genetic and environmental factors could be the basis of this difference in phenotype severity. |
| Databáze: | OpenAIRE |
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