Onasemnogene abeparvovec, sold under the brand name Zolgensma among others, is a gene therapy used to treat spinal muscular atrophy, a disease causing muscle function loss in children. It involves a one-time infusion of the medication into a vein. It works by providing a new copy of the survival of motor neuron (SMN) gene that produces the SMN protein.
Spinal muscular atrophy stems from a mutation in the survival motor neuron 1 (SMN1) gene, causing survival of motor neuron protein deficiency vital for motor neuron survival. Onasemnogene abeparvovec, a biologic medication utilizing adeno-associated virus (AAV9) virus capsids containing an SMN1 transgene, is administered to motor neurons, boosting SMN protein levels. Common side effects include vomiting and elevated liver enzymes, while more severe reactions involve liver issues and low platelet count.