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Familial recurrence risks and inheritance of multiple sclerosis
1Department of Medical Genetics, University of British Columbia, Vancouver, Canada.
Current Opinion in Neurology and Neurosurgery
|April 1, 1993
Summary
Multiple sclerosis (MS) is a complex trait influenced by genetic and environmental factors. While family history increases risk, even identical twins have less than a 100% chance of developing MS, indicating non-genetic influences.
Area of Science:
- Neurology
- Immunology
- Genetics
Background:
- The etiology of multiple sclerosis (MS) remains unknown.
- MS is considered a complex trait, likely autoimmune, influenced by genetic and environmental factors.
- Family members of MS patients exhibit an elevated risk compared to the general population.
Purpose of the Study:
- To explore the complex interplay of genetic and environmental factors in the pathogenesis of multiple sclerosis.
- To evaluate the relative risk of developing MS among different familial groups.
Main Methods:
- Review of existing epidemiological and genetic studies on multiple sclerosis.
- Analysis of risk data within families, including first-degree relatives and monozygotic twins.
Main Results:
- Relatives of MS patients have a higher risk, though still low in absolute terms.
- Monozygotic co-twins of MS patients show the highest familial risk.
- The risk for monozygotic twins is below 100%, suggesting non-genetic contributions.
Conclusions:
- Multiple sclerosis is a complex trait influenced by both genetic predisposition and environmental triggers.
- The observed familial risk patterns are consistent with a multifactorial inheritance model for MS.
- Further research is needed to elucidate the specific genetic and environmental factors contributing to MS development.