Spinal muscular atrophy: The role of SMN in axonal mRNA regulation

Claudia Fallini, Gary J. Bassell, Wilfried Rossoll

Research output: Contribution to journalReview articlepeer-review

127 Scopus citations


Spinal muscular atrophy (SMA) is a neurodegenerative disease caused by homozygous mutations or deletions in the survival of motor neuron (SMN1) gene, encoding the ubiquitously expressed SMN protein. SMN associates with different proteins (Gemins 2-8, Unrip) to form a multimeric complex involved in the assembly of small nuclear ribonucleoprotein complexes (snRNPs). Since this activity is essential for the survival of all cell types, it still remains unclear why motor neurons are selectively vulnerable to low levels of SMN protein. Aside from its housekeeping role in the assembly of snRNPs, additional functions of SMN have been proposed. The well-documented localization of SMN in axonal transport granules and its interaction with numerous mRNA-binding proteins not involved in splicing regulation suggest a role in axonal RNA metabolism. This review will focus on the neuropathological and experimental evidence supporting a role for SMN in regulating the assembly, localization, or stability of axonal messenger ribonucleoprotein complexes (mRNPs). Furthermore, how defects in this non-canonical SMN function may contribute to the motor neuron pathology observed in SMA will be discussed. This article is part of a Special Issue entitled RNA-Binding Proteins.

Original languageEnglish (US)
Pages (from-to)81-92
Number of pages12
JournalBrain Research
StatePublished - Jun 26 2012


  • Axonal outgrowth
  • Axonal transport
  • Local translation
  • Motoneuron disease
  • Motor neuron disease
  • RNA transport
  • SMA
  • SMN
  • Spinal muscular atrophy
  • Survival motor neuron

ASJC Scopus subject areas

  • General Neuroscience
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology


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