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• W1867780591 abstract "The human SMN2 transgenic mice are well-established models of spinal muscular atrophy (SMA). While the severe type I mouse model has a rapidly progressive condition mimicking type I SMA in humans, the mild type III mice do not faithfully recapitulate chronic SMA variants affecting children. A SMA mouse model that clinically mimics the features of type II and III SMA in human is therefore needed. In this study, we generated intermediately affected SMA mice by delivering low-dose morpholino oligomer (PMO25) into the existing severe SMA mice. We show that a single low-dose administration of PMO25 moderately extended the survival of severe type I SMA mice. The neuromuscular pathology is also modestly but significantly improved in these mice. A second administration of PMO25 at postnatal day 5 (PND5) demonstrated an additive effect on survival. Additional systemic administration of low-dose PMO25 at 2-week intervals suppressed the occurrence of distal necrosis beyond postnatal day 100, and induced more complete phenotypic rescue than a single bolus high-dose injection at PND0. Our study demonstrates that survival of motor neuron (SMN) is required early at a critical threshold to prevent symptoms and suggests that subsequent systemic administration of low-dose PMO25 in SMA mice can provide therapeutic benefit and phenotypic rescue, presumably via peripheral SMN restoration. Our work also provides additional insight into the time window of response to administration of antisense oligonucleotides to SMA mice with an intermediate phenotype. This information is crucial at a time when a number of therapeutic interventions are in clinical trials in SMA patients." @default.
• W1867780591 created "2016-06-24" @default.
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• W1867780591 date "2015-08-11" @default.
• W1867780591 modified "2023-10-13" @default.
• W1867780591 title "Repeated low doses of morpholino antisense oligomer: an intermediate mouse model of spinal muscular atrophy to explore the window of therapeutic response" @default.
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• W1867780591 doi "https://doi.org/10.1093/hmg/ddv329" @default.
• W1867780591 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4614699" @default.
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