A possible explanation of<unk>  must include processes involved in the development of both Familial and Sporadic forms of ALS. The most commonly accepted view suggests that the disorder is the likely result of a complex interplay between genetic and environmental factors. Other theories also suggest that the pathogenesis of ALS is a multistep process. In the Case of Familial ALS pathological genes causing disease are present from birth however accumulation of disease-causing proteins might take time to build up and exposure to environmental toxins might trigger the multistep process.  However, in most cases,<unk><unk>  Sclerosis is a Sporadic form in which a small impact of genetic factors with a major contribution from environmental factors. Therefore, the most common explanation for ALS pathophysiology is a two-step process of exposure to genetic risk factors and environmental triggers that triggers the downstream cascade pathway.
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