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A complete genomic screen for multiple sclerosis underscores a role for the major histocompatability complex. The
J L Haines1, M Ter-Minassian, A Bazyk
1Molecular Neurogenetics Unit, Massachusetts General Hospital, Boston 02129, USA.
Nature Genetics
|August 1, 1996
Summary
Multiple sclerosis (MS) susceptibility involves complex genetics. A large genomic screen identified 19 regions, suggesting multiple moderate-effect genes and environmental factors contribute to this autoimmune disorder.
Area of Science:
- Neuroimmunology
- Genetics
- Autoimmune Diseases
Background:
- Multiple sclerosis (MS) is a common autoimmune demyelinating disorder of the central nervous system, affecting young adults.
- Genetic factors contribute to MS risk, evidenced by familial aggregation and twin studies.
- Previous candidate gene studies, particularly implicating the Major Histocompatibility Complex (MHC), have yielded inconsistent results.
Purpose of the Study:
- To conduct a comprehensive genomic screen to identify novel genetic regions associated with MS susceptibility.
- To investigate the genetic architecture of MS beyond the MHC region.
Main Methods:
- A two-stage, multi-analytical genomic screen was employed.
- 443 genetic markers were genotyped across relevant populations.
- Linkage analysis was performed to identify regions harboring MS susceptibility genes.
Main Results:
- Nineteen distinct genomic regions potentially linked to MS susceptibility were identified.
- The MHC region on chromosome 6p was among the identified regions, consistent with prior research.
- No single genetic locus demonstrated overwhelming evidence for linkage, indicating complex inheritance patterns.
Conclusions:
- The genetic basis of MS is likely multifactorial, involving multiple genes with moderate effects.
- Environmental factors likely play a significant role alongside genetic predisposition.
- The findings challenge simple Mendelian inheritance models for MS etiology.