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Multiple sclerosis: the environment and causation.
Gavin Giovannoni1, George Ebers
1Institute of Cell and Molecular Science, Queen Mary University London, London, UK. g.giovannoni@qmul.ac.uk
Current Opinion in Neurology
|May 15, 2007
Summary
Multiple sclerosis (MS) risk involves genetic susceptibility interacting with environmental factors at a population level. Research highlights human leucocyte antigen (HLA) associations and environmental influences like vitamin D, Epstein-Barr virus, and smoking.
Area of Science:
- Neuroimmunology
- Genetic Epidemiology
- Environmental Health
Background:
- Multiple sclerosis (MS) is a complex neurological disorder with a multifactorial etiology.
- Understanding the interplay between genetic predisposition and environmental exposures is crucial for MS research.
Purpose of the Study:
- To review current understanding of multiple sclerosis (MS) aetiology.
- To examine the interaction between genetic susceptibility and environmental risk factors at the population level.
- To discuss contemporary causation theories for MS.
Main Methods:
- Review of current scientific literature on MS aetiology.
- Analysis of findings from large-scale genomic and genetic epidemiological studies.
- Application of modified Bradford Hill's criteria for causation.
Main Results:
- Genome-wide studies confirm strong associations with human leucocyte antigen (HLA) class II alleles (DRB1 and DQB).
- No evidence of non-genetic transmissibility within families suggests macroenvironmental influences on MS risk.
- Environmental factors under renewed investigation include vitamin D status, Epstein-Barr virus infection, and smoking.
Conclusions:
- Multiple sclerosis (MS) arises from a complex interaction between genetic and environmental factors.
- Causation theories for MS must align with the disease's underlying biology.
- Modified Bradford Hill's criteria offer a framework for establishing MS causation.
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