The Survival of Motor Neuron (SMN) Protein Interacts with the mRNA-Binding Protein HuD and Regulates Localization of Poly(A) mRNA in Primary Motor Neuron Axons
Open accessAbstract
Spinal muscular atrophy (SMA) results from reduced levels of the survival of motor neuron (SMN) protein, which has a well characterized function in spliceosomal small nuclear ribonucleoprotein assembly. Currently, it is not understood how deficiency of a housekeeping protein leads to the selective degeneration of spinal cord motor neurons. Numerous studies have shown that SMN is present in neuronal processes and has many interaction partners, including mRNA-binding proteins, suggesting a potential noncanonical role in axonal mRNA metabolism. In this study, we have established a novel technological approach using bimolecular fluorescence complementation (BiFC) and quantitative image analysis to characterize SMN-protein interactions in primary motor neurons. Consistent with biochemical studies on the SMN complex, BiFC analysis revealed that SMN dimerizes and interacts with Gemin2 in nuclear gems and axonal granules. In addition, using pull down assays, immunofluorescence, cell transfection, and BiFC, we characterized a novel interaction between SMN and the neuronal mRNA-binding protein HuD, which was dependent on the Tudor domain of SMN. A missense mutation in the SMN Tudor domain, which is known to cause SMA, impaired the interaction with HuD, but did not affect SMN axonal localization or self-association. Furthermore, time-lapse microscopy revealed SMN cotransport with HuD in live motor neurons. Importantly, SMN knockdown in primary motor neurons resulted in a specific reduction of both HuD protein and poly(A) mRNA levels in the axonal compartment. These findings reveal a noncanonical role for SMN whereby its interaction with mRNA-binding proteins may facilitate the localization of associated poly(A) mRNAs into axons.
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HuD interacts with SMN protein in axonal compartments of neurons.
“A series of cell imaging and biochemical experiments in three independent studies demonstrated that HuD interacts with SMN protein in axonal compartments of neurons (Hubers et al. 2010; Akten et al. 2011; Fallini et al. 2011).”
From Emerging complexity of the HuD/ELAVl4 gene; implications for neuronal development, function, and dysfunction (2013) · cites this paper as Fallini et al. 2011
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- Authors
- Fallini, C., Zhang, H., Su, Y., Silani, V., Singer, R. H., Rossoll, W., & Bassell, G. J.
- Affiliations
- Emory University (US)
- Albert Einstein College of Medicine (US)
- University of Milan (IT)
- Corresponding author
- Rossoll, Wilfried
- Bassell, Gary J.
- ORCID
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 2011-03-09
- Volume
- 31
- Issue
- 10
- Pages
- 3914-3925
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- PMC
- PMC3070748
- OpenAlex
- W2056116259
- Cited by
- 221
- References
- 73
- Citations by year
- 2026: 10 · 2025: 3 · 2024: 7 · 2023: 14 · 2022: 14 · 2021: 13 · 2020: 21 · 2019: 7 · 2018: 14 · 2017: 23 · 2016: 19 · 2015: 8 · 2014: 18 · 2013: 24 · 2012: 18
- FWCI
- 11.04
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Journal of Neuroscience Nursing
- Funders
- Spinal Muscular Atrophy Foundation
- Emory University (P30NS055077)
- National Institutes of Health (NS066030)
- National Institute of General Medical Sciences (R01GM084364)
- National Institute of Neurological Disorders and Stroke (R21NS066030, P30NS055077, NS066030)
- Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01HD055835, HD055835)
- Topics
- Health Sciences › Medicine › Genetics › Neurogenetic and Muscular Disorders Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
- Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
- Keywords
- survival motor neuron protein, HUD, spinal muscular atrophy, poly(A)+ mRNA, mRNA-binding proteins, Tudor domain, Gemin2, motor neurons, axonal transport
- MeSH terms
- ELAV-Like Protein 4, Animals, Axons, Chick Embryo, Fluorescent Antibody Technique, Hippocampus, Humans, Motor Neurons, Poly A, Blotting, Western, Prosencephalon, In Situ Hybridization, Fluorescence, Poly(A)-Binding Proteins, Immunoprecipitation, Mice, Rats, ELAV Proteins, SMN Complex Proteins, HEK293 Cells
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