Heterogeneous contribution of microdeletions in the development of common generalised and focal epilepsies.
J Med Genet
; 54(9): 598-606, 2017 09.
Article
em En
| MEDLINE
| ID: mdl-28756411
ABSTRACT
BACKGROUND:
Microdeletions are known to confer risk to epilepsy, particularly at genomic rearrangement 'hotspot' loci. However, microdeletion burden not overlapping these regions or within different epilepsy subtypes has not been ascertained.OBJECTIVE:
To decipher the role of microdeletions outside hotspots loci and risk assessment by epilepsy subtype.METHODS:
We assessed the burden, frequency and genomic content of rare, large microdeletions found in a previously published cohort of 1366 patients with genetic generalised epilepsy (GGE) in addition to two sets of additional unpublished genome-wide microdeletions found in 281 patients with rolandic epilepsy (RE) and 807 patients with adult focal epilepsy (AFE), totalling 2454 cases. Microdeletions were assessed in a combined and subtype-specific approaches against 6746 controls.RESULTS:
When hotspots are considered, we detected an enrichment of microdeletions in the combined epilepsy analysis (adjusted p=1.06×10-6,OR 1.89, 95% CI 1.51 to 2.35). Epilepsy subtype-specific analyses showed that hotspot microdeletions in the GGE subgroup contribute most of the overall signal (adjusted p=9.79×10-12, OR 7.45, 95% CI 4.20-13.5). Outside hotspots , microdeletions were enriched in the GGE cohort for neurodevelopmental genes (adjusted p=9.13×10-3,OR 2.85, 95% CI 1.62-4.94). No additional signal was observed for RE and AFE. Still, gene-content analysis identified known (NRXN1, RBFOX1 and PCDH7) and novel (LOC102723362) candidate genes across epilepsy subtypes that were not deleted in controls.CONCLUSIONS:
Our results show a heterogeneous effect of recurrent and non-recurrent microdeletions as part of the genetic architecture of GGE and a minor contribution in the aetiology of RE and AFE.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Deleção Cromossômica
/
Epilepsias Parciais
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Epilepsia Generalizada
/
Epilepsia Rolândica
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article