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Published online 17 November 2003. doi:10.1083/jcb.200304128
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© The Rockefeller University Press, 0021-9525/2003/11/801 $8.00
The Journal of Cell Biology, Volume 163, Number 4, 801-812


Article

Smn, the spinal muscular atrophy–determining gene product, modulates axon growth and localization of ß-actin mRNA in growth cones of motoneurons



Wilfried Rossoll1, Sibylle Jablonka1, Catia Andreassi1, Ann-Kathrin Kröning1, Kathrin Karle1, Umrao R. Monani2 and Michael Sendtner1

1 Institute for Clinical Neurobiology, University of Wuerzburg, 97080 Wuerzburg, Germany
2 Department of Molecular and Cellular Biochemistry, The Ohio State University, Columbus, OH 43210

Address correspondence to Michael Sendtner, Institute for Clinical Neurobiology, Josef-Schneider-Str. 11, 97080 Wuerzburg, Germany. Tel.: (49) 931-201-49767. Fax: (49) 931-201-49788. email: sendtner{at}mail.uni-wuerzburg.de

Spinal muscular atrophy (SMA), a common autosomal recessive form of motoneuron disease in infants and young adults, is caused by mutations in the survival motoneuron 1 (SMN1) gene. The corresponding gene product is part of a multiprotein complex involved in the assembly of spliceosomal small nuclear ribonucleoprotein complexes. It is still not understood why reduced levels of the ubiquitously expressed SMN protein specifically cause motoneuron degeneration. Here, we show that motoneurons isolated from an SMA mouse model exhibit normal survival, but reduced axon growth. Overexpression of Smn or its binding partner, heterogeneous nuclear ribonucleoprotein (hnRNP) R, promotes neurite growth in differentiating PC12 cells. Reduced axon growth in Smn-deficient motoneurons correlates with reduced ß-actin protein and mRNA staining in distal axons and growth cones. We also show that hnRNP R associates with the 3' UTR of ß-actin mRNA. Together, these data suggest that a complex of Smn with its binding partner hnRNP R interacts with ß-actin mRNA and translocates to axons and growth cones of motoneurons.

Key Words: SMA; SMN; RNA transport; ß-actin; hnRNP R


W. Rossoll and S. Jablonka contributed equally to this paper.

The online version of this article includes supplemental material.

Abbreviations used in this paper: hnRNP, heterogeneous nuclear ribonucleoprotein; phospho-tau, phosphorylated tau protein; RRM, RNA recognition motif; SMA, spinal muscular atrophy; SMN, survival motoneuron; snRNPs, small nuclear ribonucleoproteins.


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