Exploration of a putative susceptibility locus for idiopathic generalized epilepsy on chromosome 8p12

Item Type:	Article
Title:	Exploration of a putative susceptibility locus for idiopathic generalized epilepsy on chromosome 8p12
Creators Name:	Sander, T. and Windemuth, C. and Schulz, H. and Saar, K. and Gennaro, E. and Riggio, C. and Bianchi, A. and Zara, F. and Rudolf, G. and Picard, F. and Bulteau, C. and Kaminska, A. and Cieuta, C. and Prud'homme, J.F. and Dulac, O. and Bate, L. and Robinson, R. and Gardiner, R.M. and Covanis, A. and de Haan, G.J. and Janssen, G.A.M.A. and van Erp, M.G. and Boezeman, E.H.J.F. and Lindhout, D. and Heils, A. and Nuernberg, P. and Janz, D.
Abstract:	PURPOSE: A recent genome-wide scan revealed a major susceptibility locus for idiopathic generalized epilepsies (IGEs) in the chromosomal region 8p12 in 32 IGE families without members with juvenile myoclonic epilepsy (JME). This study explored the presence of an IGE locus in the chromosomal region 8p12.METHODS: Our study included 176 multiplex families of probands with common IGE syndromes. Parametric and nonparametric multipoint linkage analyses were carried out between the IGE trait and six microsatellite polymorphisms encompassing the putative susceptibility locus. To explore the associated phenotype-genotype relation, two distinct subgroups of families were selected by the presence (n = 64) or absence (n = 112) of a family member with JME. To adjust the phenotypic spectrum toward adolescent-onset IGEs, a third subgroup of 28 families without JME was chosen through an IGE proband with seizure onset at age 10-20 years.RESULTS: Parametric and nonparametric multipoint linkage analyses provided no evidence for linkage between IGE and markers encompassing the putative IGE locus in the chromosomal region 8p12. Furthermore, we found no hint of linkage along the candidate region in any of the three family subgroups. CONCLUSIONS: We failed to provide evidence for a major IGE locus in the chromosomal region 8p12. On the contrary, these parametric linkage results provide strong evidence against linkage across the candidate region under a broad range of genetic models. If there is a susceptibility locus for IGE in the chromosomal region 8p12, then the size of the effect or the proportion of linked families is too small to detect linkage in the investigated family sample.
Keywords:	Absence Epilepsy, Alleles, Chromosome Mapping, Dinucleotide Repeats, Europe, Gene Frequency, Generalized Epilepsy, Genetic Markers, Genetic Models, Genetic Polymorphism, Genetic Predisposition to Disease, Genotype, Juvenile Myoclonic Epilepsy, Lod Score, Pair 8 Human Chromosomes, Phenotype, Syndrome, Tonic-Clonic Epilepsy
Source:	Epilepsia
ISSN:	0013-9580
Volume:	44
Number:	1
Page Range:	32-39
Date:	January 2003
Official Publication:	https://doi.org/10.1046/j.1528-1157.2003.51501.x
PubMed:	View item in PubMed

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