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Spinal muscular atrophy (SMA) is a rare genetic disorder caused by mutations in the SMN1 gene. These mutations lead to a deficiency of the survival motor neuron (SMN) protein, which results in the loss of specialized nerve cells in the spinal cord and brainstem such that information cannot be passed from the brain to the muscle. This leads to severe muscle weakness and loss of muscle control, as well as impaired breathing and swallowing in severe cases. As part of a collaborative alliance with Biogen, GTP is developing an AAV gene therapy approach to elicit long-term expression of SMN1 in motor neurons for the treatment of SMA.