Familial and sporadic 15q13.3 microdeletions in idiopathic generalized epilepsy: precedent for disorders with complex inheritance.

Abstract:

:Microdeletion at chromosomal position 15q13.3 has been described in intellectual disability, autism spectrum disorders, schizophrenia and recently in idiopathic generalized epilepsy (IGE). Using independent IGE cohorts, we first aimed to confirm the association of 15q13.3 deletions and IGE. We then set out to determine the relative occurrence of sporadic and familial cases and to examine the likelihood of having seizures for individuals with the microdeletion in familial cases. The 15q13.3 microdeletion was identified in 7 of 539 (1.3%) unrelated cases of IGE using quantitative PCR or SNP arrays and confirmed by array comparative genomic hybridization analysis using probes specific to the 15q13.3 region. The inheritance of this lesion was tracked using family studies. Of the seven microdeletions identified in probands, three were de novo, two were transmitted from an unaffected parent and in two cases the parents were unavailable. Non-penetrance of the microdeletion was identified in 4/7 pedigrees and three pedigrees included other family members with IGE who lacked the 15q13.3 deletion. The odds ratio is 68 (95% confidence interval 29-181), indicating a pathogenic lesion predisposing to epilepsy with complex inheritance and incomplete penetrance for the IGE component of the phenotype in multiplex families.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Dibbens LM,Mullen S,Helbig I,Mefford HC,Bayly MA,Bellows S,Leu C,Trucks H,Obermeier T,Wittig M,Franke A,Caglayan H,Yapici Z,EPICURE Consortium.,Sander T,Eichler EE,Scheffer IE,Mulley JC,Berkovic SF

doi

10.1093/hmg/ddp311

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

3626-31

issue

19

eissn

0964-6906

issn

1460-2083

pii

ddp311

journal_volume

18

pub_type

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