This study was supported by grants from the National Natural Science Foundation of China (No. 81050034) and from the Foundation of Capital Institute of Pediatrics (No.10-B09).
Background Infantile proximal spinal muscular atrophy (SMA) is a common autosomal recessive neuromuscular disorder. Approximately 90-95% cases of SMA result from homozygous deletion of survival motor neuron gene 1(...