Abstract:
BACKGROUND:Both genetic and environmental factors play a role in the pathophysiology of MS and may influence the clinical expression of the disease. OBJECTIVE:To determine the contribution of familial factors to the clinical expression of MS. METHODS:The French Multiple Sclerosis Genetics Group identified 87 sibling pairs. For each patient, sex, age at onset, duration of the disease, and disease course from onset were recorded. Disability was determined by the progression index (PI), defined as the ratio of the Expanded Disability Status Scale (EDSS) score disease duration when the latter exceeded 5 years. Statistical analyses were performed either with a group of patients (clinical features, relation between human leukocyte antigen and clinical features) or with a group of sibpairs (concordance for clinical features). RESULTS:The mean age at onset was 29.6 years, the ratio of women to men was 59:28, and the mean PI was 0.27. There was no correlation for disease course and age at onset between sibs with MS. In contrast, we observed a weak but significant correlation of the PI in MS sibpairs (r = 0.234, p = 0.03). CONCLUSION:This study revealed a concordance in MS sibling pairs for the disease severity, supporting the hypothesis that the degree of disability might be partly influenced by familial factors (environmental or genetic).
journal_name
Neurologyjournal_title
Neurologyauthors
Brassat D,Azais-Vuillemin C,Yaouanq J,Semana G,Reboul J,Cournu I,Mertens C,Edan G,Lyon-Caen O,Clanet M,Fontaine Bdoi
10.1212/wnl.52.8.1632subject
Has Abstractpub_date
1999-05-12 00:00:00pages
1632-6issue
8eissn
0028-3878issn
1526-632Xjournal_volume
52pub_type
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