Abstract
Spinal muscular atrophy (SMA) is an autosomal recessive disease of childhood due to loss of the telomeric survival motor neuron gene, SMN1 . The general functions of the main SMN1 protein product, full-length SMN (FL-SMN), do not explain the selective motoneuronal loss of SMA. We identified axonal-SMN (a-SMN), an alternatively spliced SMN form, preferentially encoded by the SMN1 gene in humans. The a-SMN transcript and protein are down-regulated during early development in different tissues. In the spinal cord, the a-SMN protein is selectively expressed in motor neurons and mainly localized in axons. Forced expression of a-SMN stimulates motor neuron axonogenesis in a time-dependent fashion and induces axonal-like growth in non-neuronal cells. Exons 2b and 3 are essential for the axonogenic effects. This discovery indicates an unexpected complexity of the SMN gene system and may help in understanding the pathogenesis of SMA.
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Dates
Type | When |
---|---|
Created | 18 years, 6 months ago (Feb. 2, 2007, 1:37 p.m.) |
Deposited | 3 years, 4 months ago (April 12, 2022, 2:50 p.m.) |
Indexed | 1 year ago (Aug. 10, 2024, 12:33 p.m.) |
Issued | 18 years, 6 months ago (Feb. 6, 2007) |
Published | 18 years, 6 months ago (Feb. 6, 2007) |
Published Online | 18 years, 6 months ago (Feb. 6, 2007) |
Published Print | 18 years, 6 months ago (Feb. 6, 2007) |
@article{Setola_2007, title={Axonal-SMN (a-SMN), a protein isoform of the survival motor neuron gene, is specifically involved in axonogenesis}, volume={104}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.0610660104}, DOI={10.1073/pnas.0610660104}, number={6}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Setola, Veronica and Terao, Mineko and Locatelli, Denise and Bassanini, Stefania and Garattini, Enrico and Battaglia, Giorgio}, year={2007}, month=feb, pages={1959–1964} }