Human Molecular Genetics, 2000, Vol. 9, No. 3 341-346
© 2000 Oxford University Press
Reduced survival motor neuron (Smn) gene dose in mice leads to motor neuron degeneration: an animal model for spinal muscular atrophy type III
Klinische Forschergruppe Neuroregeneration, Department of Neurology, University of Würzburg, Josef-Schneider Strasse 11, D-97080 Würzburg, Germany
Spinal muscular atrophy (SMA) is caused by deletion or specific mutations of the telomeric survival motor neuron (SMN) gene on human chromosome 5. The human SMN gene, in contrast to the Smn gene in mouse, is duplicated and the centromeric copy on chromosome 5 codes for transcripts which preferentially lead to C-terminally truncated SMN protein. Here we show that a 46% reduction of Smn protein levels in the spinal cord of Smn heterozygous mice leads to a marked loss of the cytoplasmic Smn pool and motor neuron degeneration resembling spinal muscular atrophy type 3. Smn heterozygous mice described here thus represent a model for the human disease. These mice could allow screening for SMA therapies and help in gaining further understanding of the pathophysiological events leading to motor neuron degeneration in SMA.
+ Present address: Deutsche Klinik für Diagnostik GmbH, Postfach 21 49, D-65011 Wiesbaden, Germany
§ Present address: Medizinische Klinik IV, Universität Erlangen-Nürnberg, Nephrologisches Forschungslabor, Loschgestrasse 8, D-91054 Erlangen, Germany
¶ To whom correspondence should be addressed. Tel: +49 931 201 5767; Fax: +49 931 201 2697; Email: sendtner@mail.uni-wuerzburg.de
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