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

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...

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Autores principales: Rossoll, Wilfried, Jablonka, Sibylle, Andreassi, Catia, Kröning, Ann-Kathrin, Karle, Kathrin, Monani, Umrao R., Sendtner, Michael
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 2003
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2173668/
https://www.ncbi.nlm.nih.gov/pubmed/14623865
http://dx.doi.org/10.1083/jcb.200304128
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author Rossoll, Wilfried
Jablonka, Sibylle
Andreassi, Catia
Kröning, Ann-Kathrin
Karle, Kathrin
Monani, Umrao R.
Sendtner, Michael
author_facet Rossoll, Wilfried
Jablonka, Sibylle
Andreassi, Catia
Kröning, Ann-Kathrin
Karle, Kathrin
Monani, Umrao R.
Sendtner, Michael
author_sort Rossoll, Wilfried
collection PubMed
description 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 β-actin protein and mRNA staining in distal axons and growth cones. We also show that hnRNP R associates with the 3′ UTR of β-actin mRNA. Together, these data suggest that a complex of Smn with its binding partner hnRNP R interacts with β-actin mRNA and translocates to axons and growth cones of motoneurons.
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spelling pubmed-21736682008-05-01 Smn, the spinal muscular atrophy–determining gene product, modulates axon growth and localization of β-actin mRNA in growth cones of motoneurons Rossoll, Wilfried Jablonka, Sibylle Andreassi, Catia Kröning, Ann-Kathrin Karle, Kathrin Monani, Umrao R. Sendtner, Michael J Cell Biol Article 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 β-actin protein and mRNA staining in distal axons and growth cones. We also show that hnRNP R associates with the 3′ UTR of β-actin mRNA. Together, these data suggest that a complex of Smn with its binding partner hnRNP R interacts with β-actin mRNA and translocates to axons and growth cones of motoneurons. The Rockefeller University Press 2003-11-24 /pmc/articles/PMC2173668/ /pubmed/14623865 http://dx.doi.org/10.1083/jcb.200304128 Text en Copyright © 2003, The Rockefeller University Press This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Article
Rossoll, Wilfried
Jablonka, Sibylle
Andreassi, Catia
Kröning, Ann-Kathrin
Karle, Kathrin
Monani, Umrao R.
Sendtner, Michael
Smn, the spinal muscular atrophy–determining gene product, modulates axon growth and localization of β-actin mRNA in growth cones of motoneurons
title Smn, the spinal muscular atrophy–determining gene product, modulates axon growth and localization of β-actin mRNA in growth cones of motoneurons
title_full Smn, the spinal muscular atrophy–determining gene product, modulates axon growth and localization of β-actin mRNA in growth cones of motoneurons
title_fullStr Smn, the spinal muscular atrophy–determining gene product, modulates axon growth and localization of β-actin mRNA in growth cones of motoneurons
title_full_unstemmed Smn, the spinal muscular atrophy–determining gene product, modulates axon growth and localization of β-actin mRNA in growth cones of motoneurons
title_short Smn, the spinal muscular atrophy–determining gene product, modulates axon growth and localization of β-actin mRNA in growth cones of motoneurons
title_sort smn, the spinal muscular atrophy–determining gene product, modulates axon growth and localization of β-actin mrna in growth cones of motoneurons
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2173668/
https://www.ncbi.nlm.nih.gov/pubmed/14623865
http://dx.doi.org/10.1083/jcb.200304128
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