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Journal Article
Research Support, Non-U.S. Gov't
Transgenic small interfering RNA halts amyotrophic lateral sclerosis in a mouse model.
Journal of Biological Chemistry 2005 December 31
Many autosomal dominant diseases such as familial amyotrophic lateral sclerosis (ALS) with copper/zinc superoxide dismutase (SOD1) mutation may be induced by missense point mutations that result in the production of proteins with toxic properties. Reduction in the encoding of proteins from such mutated genes can therefore be expected to improve the disease phenotype. The duplex of 21-nucleotide RNA, known as small interfering RNA (siRNA), has recently emerged as a powerful gene silencing tool. We made transgenic (Tg) mice with modified siRNA, which had multiple mismatch alternations within the sense strand, to prevent the "shutdown phenomenon" of transgenic siRNA. Consequently, the in vivo knockdown effect of siRNA on SOD1 expression did not diminish over four generations. When we crossed these anti-SOD1 siRNA Tg mice with SOD1G93A Tg mice, a model for ALS, siRNA prevented the development of disease by inhibiting mutant G93A SOD1 production in the central nervous system. Our findings clearly proved the principle that siRNA-mediated gene silencing can stop the development of familial ALS with SOD1 mutation.
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