title: Familial clustering of multiple sclerosis in a Dutch genetic isolate.
abstract: Multiple sclerosis (MS) is a complex disease with a substantial, yet poorly identified, genetic influence. We estimated the pattern of familial aggregation of MS in a recent genetically isolated population in The Netherlands. Forty-eight MS patients were identified. Their relationship was evaluated by tracing extended pedigrees, making use of municipal and church records. Of the 48 MS patients, 24 could be linked to a common ancestor in 14 generations. However, multiple relationships exist between patients and, to take these into account, we calculated inbreeding and kinship coefficients. We found that MS patients from the isolate were significantly more often related to each other and significantly more often inbred than a non-MS control group, drawn from the same isolate. There was no clustering of Type 1 diabetes and autoimmune thyroid diseases in families of MS patients from this isolate. Finally, HLA typing was performed. Although there was a trend towards a higher prevalence of the HLA DRB1*15 allele in patients compared to controls, differences did not reach significance. This study suggests familial aggregation in the genetically isolated population. The high level of inbreeding makes this population valuable for finding novel genes involved in MS.
authors.affiliation: Department of Neurology, MS Centre ErasMS, Erasmus MC, Rotterdam 3015 GD, The Netherlands.
authors.forename: I A
authors.initials: IA
authors.lastname: Hoppenbrouwers
authors.forename: L M Pardo
authors.initials: LM
authors.lastname: Cortes
authors.forename: Y S
authors.initials: YS
authors.lastname: Aulchenko
authors.forename: K
authors.initials: K
authors.lastname: Sintnicolaas
authors.forename: O
authors.initials: O
authors.lastname: Njajou
authors.forename: P J L M
authors.initials: PJ
authors.lastname: Snijders
authors.forename: B A
authors.initials: BA
authors.lastname: Oostra
authors.forename: C M
authors.initials: CM
authors.lastname: van Duijn
authors.forename: R Q
authors.initials: RQ
authors.lastname: Hintzen
mesh_terms: D000328:Adult; D017668:Age of Onset; D016000:Cluster Analysis; D003241:Consanguinity; D003922:Diabetes Mellitus, Type 1 / Q000453:epidemiology / Q000235:genetics; D005192:Family Health; D005260:Female; D020022:Genetic Predisposition to Disease / Q000453:epidemiology; D006684:HLA-DR Antigens / Q000235:genetics; D059811:HLA-DRB1 Chains; D006650:Histocompatibility Testing; D006801:Humans; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000453:epidemiology / Q000235:genetics*; D009426:Netherlands / Q000453:epidemiology; D010375:Pedigree; D015995:Prevalence; D013959:Thyroid Diseases / Q000453:epidemiology / Q000235:genetics
chemical_list: D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains; C507799:HLA-DRB1*15 antigen