Plastin 3 is a protective modifier of autosomal recessive spinal muscular atrophy

Gabriela E. Oprea, Sandra Kröber, Michelle L. McWhorter, Wilfried Rossoll, Stefan Müller, Michael Krawczak, Gary J. Bassell, Christine E. Beattie, Brunhilde Wirth

Research output: Contribution to journalArticlepeer-review

340 Scopus citations


Homozygous deletion of the survival motor neuron 1 gene (SMN1) causes spinal muscular atrophy (SMA), the most frequent genetic cause of early childhood lethality. In rare instances, however, individuals are asymptomatic despite carrying the same SMN1 mutations as their affected siblings, thereby suggesting the influence of modifier genes. We discovered that unaffected SMN1-deleted females exhibit significantly higher expression of plastin 3 (PLS3) than their SMA-affected counterparts. We demonstrated that PLS3 is important for axonogenesis through increasing the F-actin level. Overexpression of PLS3 rescued the axon length and outgrowth defects associated with SMN down-regulation in motor neurons of SMA mouse embryos and in zebrafish. Our study suggests that defects in axonogenesis are the major cause of SMA, thereby opening new therapeutic options for SMA and similar neuromuscular diseases.

Original languageEnglish (US)
Pages (from-to)524-527
Number of pages4
Issue number5875
StatePublished - Apr 25 2008

ASJC Scopus subject areas

  • General


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