Spinal muscular atrophy (SMA) is a genetic disease that affects about 1 in 10,000 babies. The neurodegenerative disease is usually diagnosed between the ages of 6 months and 2 years old. Four different types of SMA exist with type 1 as the most severe with poor prognosis, to type 4 which is an adult form of the disease.
In this video from the DNA Learning Center shared in July 2012, Dr. Darryl De Vivo explains disease progression for the different types of SMA.
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