Rare/ not ALS: The Spinal muscular atrophy types (1-4) arise from an inherited lack of a material that protects the motor neuron. The type 3 (onset after age 1yr) has an estimated gene prevalence of of 1/375,000 in the population and incidence of 1-6/1,000,000 births. You need a defective gene from both parents to inherit this condition.Though weakness is common to ALS/SMA they are not related.
Answered 6/11/2015
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