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Recently, there has been remarkable progress in understanding inherited forms of ALS in which well defined mutations are known to cause the disease. Rodent models in which the superoxide dismutase-1 (SOD1) mutation is overexpressed recapitulate hallmark signs of ALS in patients. Early anatomical changes in mouse models of fALS are seen in the neuromuscular junctions (NMJs) and lower motor neurons, and selective reduction of toxic mutant SOD1 in the spinal cord and muscle of these models has beneficial effects. Therefore, much of ALS research has focused on spinal motor neuron and NMJ aspects of the disease. Here we show that, in the SOD1<jats:sup>G93A<\/jats:sup>rat model of ALS, spinal motor neuron loss occurs presymptomatically and before degeneration of ventral root axons and denervation of NMJs. Although overt cell death of corticospinal motor neurons does not occur until disease endpoint, we wanted to establish whether the upper motor neuron might still play a critical role in disease progression. Surprisingly, the knockdown of mutant SOD1 in only the motor cortex of presymptomatic SOD1<jats:sup>G93A<\/jats:sup>rats through targeted delivery of AAV9\u2013SOD1\u2013shRNA resulted in a significant delay of disease onset, expansion of lifespan, enhanced survival of spinal motor neurons, and maintenance of NMJs. This datum suggests an early dysfunction and thus an important role of the upper motor neuron in this animal model of ALS and perhaps patients with the disease.<\/jats:p>","DOI":"10.1523\/jneurosci.2037-14.2014","type":"journal-article","created":{"date-parts":[[2014,11,19]],"date-time":"2014-11-19T17:23:24Z","timestamp":1416417804000},"page":"15587-15600","source":"Crossref","is-referenced-by-count":136,"title":["Delayed Disease Onset and Extended Survival in the SOD1<sup>G93A<\/sup>Rat Model of Amyotrophic Lateral Sclerosis after Suppression of Mutant SOD1 in the Motor Cortex"],"prefix":"10.1523","volume":"34","author":[{"given":"Gretchen 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