Journal
NEUROLOGIC CLINICS
Volume 33, Issue 4, Pages 877-+Publisher
W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1016/j.ncl.2015.07.009
Keywords
ALS; Epidemiology; Environmental risk factors; Smoking; Gender; Military service; Oxidative stress
Categories
Funding
- National Institutes of Health [UL1 TR000002, R01 ES 016848-01A2, KL2 TR000134]
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The causes of amyotrophic lateral sclerosis (ALS) are largely unknown, and may always be multiple, including environmental factors. Monogenetic determinants of ALS are involved in roughly 20% of all cases (including 10% familial cases). Less well understood multigenetic causes may contribute to another 20% to 80%. Environmental factors likely play a role in the development of ALS in susceptible individuals, but proved causation remains elusive. This article discusses the possible factors of male gender (males are selectively exposed to different influences, or genetically predisposed to be susceptible), smoking, military service, exercise, electrical exposure, heavy metals, agricultural chemicals, and geographic clusters.
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