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Epidemiology of ALS

¹Division of Epidemiology, Stanford University School of Medicine, CA 94305-5092, USA.

Clinical Neuroscience (New York, N.Y.)

|January 1, 1995

Summary

Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease primarily affecting adults, with risk increasing with age and affecting men more than women. While genetics play a role in familial cases, environmental factors and toxicants may contribute to sporadic ALS.

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Area of Science:

Neuroscience
Genetics
Epidemiology

Background:

Amyotrophic lateral sclerosis (ALS) is an adult-onset neurodegenerative disorder with unknown causes.
ALS incidence rises with age, and men are more frequently affected than women.
Genetic susceptibility is a key risk factor, implicated in approximately 10% of familial ALS cases.

Purpose of the Study:

To review the known risk factors and potential etiologies of Amyotrophic Lateral Sclerosis (ALS).
To explore the interplay between genetic predisposition and environmental influences in ALS development.
To summarize current understanding of ALS pathogenesis based on genetic and epidemiological evidence.

Main Methods:

Review of genetic linkage studies identifying mutations in genes like superoxide dismutase.
Analysis of epidemiological studies investigating occupational exposures and environmental toxicants.
Examination of evidence for other potential risk factors such as physical trauma and exertion.

Main Results:

A mutant form of the Cu/Zn superoxide dismutase gene is implicated in 15-20% of familial ALS.
Associations exist between sporadic ALS and occupational toxicant exposure.
Evidence for roles of physical trauma, electrical shock, and vigorous exertion in ALS etiology is inconsistent.

Conclusions:

While genetic factors are established in familial ALS, the etiology of sporadic ALS likely involves environmental toxicants acting on a susceptible background.
Further research is needed to elucidate the specific mechanisms linking environmental exposures and genetic susceptibility to ALS.
Understanding these factors is crucial for developing effective prevention and treatment strategies for ALS.

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