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Updated: Jul 11, 2026

Modeling Multiple Sclerosis in the Two Sexes: MOG35-55-Induced Experimental Autoimmune Encephalomyelitis
Published on: October 13, 2023
Multiple sclerosis susceptibility and the X chromosome.
B M Herrera1, M Z Cader, D A Dyment
1The Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, UK, Department of Clinical Neurology, University of Oxford, Oxford, UK.
Genetic studies investigating multiple sclerosis (MS) susceptibility found no significant evidence for X-linked inheritance. This research suggests the X-chromosome is unlikely to harbor a primary genetic locus for MS.
Area of Science:
- Genetics
- Immunology
- Neuroscience
Background:
- Multiple sclerosis (MS) is a complex autoimmune disorder with a known genetic component.
- A notable female predominance and maternal parent-of-origin effects suggest potential sex-chromosome involvement.
- Previous studies proposed X-linked transmission of MS susceptibility.
Purpose of the Study:
- To investigate the role of the X-chromosome in multiple sclerosis susceptibility.
- To determine if X-linked genetic factors contribute to MS inheritance.
- To explore parent-of-origin effects on the X-chromosome in MS.
Main Methods:
- Genotyping of 726 relative pairs (552 affected sib-pairs) and 195 aunt-uncle/niece-nephew (AUNN) pairs using X-chromosome microsatellite markers.
- Analysis of parent-of-origin effects by stratifying AUNN families by maternal and paternal transmission.
- Exclusion analysis using lambda (λ) thresholds and LOD scores to assess linkage.
Main Results:
- Exclusion of X-linked susceptibility loci with lambda (λ) values of 1.9 for sib-pairs and AUNN pairs, and 1.6 for the combined dataset.
- No significant linkage was detected in either dataset, even when stratified by HLA-DRB1*15 allele status or transmission direction.
- The X-chromosome was unlikely to harbor an independent MS susceptibility locus or one interacting with the HLA region.
Conclusions:
- The X-chromosome is unlikely to contain a major independent susceptibility locus for multiple sclerosis.
- Complex genetic interactions, potentially including epigenetic factors or balanced polymorphisms, may influence MS inheritance.
- Further research is needed to elucidate the complex genetic architecture of multiple sclerosis.
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