A member asked:

Is sma type ii a congenital affliction?

A doctor has provided 1 answer

Yes: Spinal muscular atrophy (sma) is caused by a mutation in the survival motor neuron gene 1 (smn1). Most of the time, parents are unaffected and the mutation newly appears in the affected child.

Answered 9/29/2016

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What are the genetics of sma?

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