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Clinical concordance in sibling pairs with multiple sclerosis
N P Robertson1, D Clayton, M Fraser
1University of Cambridge Neurology unit, Addenbrooke's Hospital, England.
Neurology
|August 1, 1996
Summary
Genetic factors influence multiple sclerosis (MS) clinical presentation in families. Familial MS recurrence is high, suggesting environmental triggers interact with inherited predispositions.
Area of Science:
- Neurology
- Genetics
- Epidemiology
Background:
- Multiple sclerosis (MS) is a complex neurological disorder with suspected genetic and environmental influences.
- Understanding familial aggregation and clinical variability is crucial for etiological research.
Purpose of the Study:
- To investigate clinical and genetic factors influencing multiple sclerosis (MS) in families with concordant siblings.
- To assess familial recurrence rates and clinical concordance for disease course and progression.
Main Methods:
- Collected clinical, demographic, and genetic data from 166 families with multiple affected siblings.
- Performed intrafamilial comparisons of disease onset, symptoms, disability, and disease course.
- Calculated familial recurrence rates for MS.
Main Results:
- No significant correlation found for age at onset, but a minor correlation for year at onset was observed.
- Strong correlation for disease course and moderate correlation for gender within families.
- Familial recurrence rate of 33%, nearly double previous local estimates.
Conclusions:
- Inherited factors modify clinical features of MS within families.
- MS etiology likely involves environmental triggers interacting with genetic susceptibility.
- Familial risk patterns have implications for genetic counseling in MS.