Spinal muscular atrophy: A changing phenotype beyond the clinical trials.

Abstract excerpt

Spinal muscular atrophy is a monogenic, progressive motor neuron disorder caused by deletion or mutation in the SMN1 gene. A broad range of phenotypic severity, from very weak infants (Type 1) to ambulant children (type 3), is modified mainly by the number of copies of the "backup" SMN2 gene. Since the discovery of the role of both genes, basic research into the pathobiology of SMA, with in vitro and animal model...

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