Cited by 113RNA Research and SplicingAmyotrophic Lateral Sclerosis ResearchMyasthenia Gravis and Thymoma

Rescuing Z + agrin splicing in Nova null mice restores synapse formation and unmasks a physiologic defect in motor neuron firing

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Ruggiu, Matteo, Herbst, Ruth, Kim, Natalie, Jevsek, Marko, Fak, John J., Mann, Mary Anne, Fischbach, Gerald, Burden, Steven J. +1 more·2009·Proceedings of the National Academy of Sciences

Abstract

Synapse formation at the neuromuscular junction (NMJ) requires an alternatively spliced variant of agrin (Z + agrin) that is produced only by neurons. Here, we show that Nova1 and Nova2, neuron-specific splicing factors identified as targets in autoimmune motor disease, are essential regulators of Z + agrin. Nova1 / Nova2 double knockout mice are paralyzed and fail to cluster AChRs at the NMJ, and breeding them with transgenic mice constitutively expressing Z + agrin in motor neurons rescued AChR clustering. Surprisingly, however, these rescued mice remained paralyzed, while electrophysiologic studies demonstrated that the motor axon and synapse were functional-spontaneous and evoked recordings revealed synaptic transmission and muscle contraction. These results point to a proximal defect in motor neuron firing in the absence of Nova and reveal a previously unsuspected role for RNA regulation in the physiologic activation of motor neurons.

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Crossref · 10.1073/pnas.0813112106

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48 of 48 references verified0 citation errors · 0 not checkable

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  • The paralysis phenotype and early mortality are unchanged by the Z+ Agrn transgene, indicating contributions of additional NOVA targets.

    “The paralysis phenotype and early mortality are unchanged by the transgene, indicating the contributions of additional NOVA targets, possibly in other brain regions.”

    From The neurogenetics of alternative splicing (2016) · cites this paper as [73]

  • Restoring Z+ Agrn expression in dKO motor neurons via a transgene rescues AChR clustering, nerve terminal apposition, NMJ morphology and muscle responses to stimuli.

    “restoring Z+ Agrn expression in dKO motor neurons via a transgene rescues AchR clustering, nerve terminal apposition, NMJ morphology and muscle responses to stimuli73.”

    From The neurogenetics of alternative splicing (2016) · cites this paper as [73]

  • Nova1/2 dKO mice, but not single-knockout mice, show fewer acetylcholine receptor clusters and a loss of apposition between AChR clusters and phrenic nerve terminals.

    “the dKO mice, but not the single-knockout mice, show fewer acetylcholine receptor (AChR) clusters and a loss of apposition between AChR clusters and phrenic nerve terminals”

    From The neurogenetics of alternative splicing (2016) · cites this paper as [73]

  • Nova1/2 dKO mice are born paralysed and die from respiratory failure indicative of NMJ defects.

    “Nova1/2 dKO mice are born paralysed and die from respiratory failure indicative of NMJ defects73.”

    From The neurogenetics of alternative splicing (2016) · cites this paper as [73]

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Authors
Ruggiu, M., Herbst, R., Kim, N., Jevsek, M., Fak, J. J., Mann, M. A., Fischbach, G., Burden, S. J., & Darnell, R. B.
Affiliations
  • Howard Hughes Medical Institute (US)
  • NYU Langone Health (US)
  • Molecular Neurobiology Program, Helen and Martin S. Kimmel Center for Biology and Medicine, Skirball Institute of Biomolecular Medicine, New York University Medical School, 540 First Avenue, New York, NY 10016; and
  • Laboratory of Molecular Neuro-Oncology,
  • Columbia University (US)
Corresponding author
Darnell, Robert B.
Venue
Proceedings of the National Academy of Sciences
Published
2009-03-03
Volume
106
Issue
9
Pages
3513-3518
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2131636181
Cited by
113
References
48
Citations by year
2026: 1 · 2025: 3 · 2024: 6 · 2023: 7 · 2022: 8 · 2021: 2 · 2020: 4 · 2019: 5 · 2018: 9 · 2017: 8 · 2016: 10 · 2015: 7 · 2014: 6 · 2013: 9 · 2012: 7
FWCI
3.63
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Howard Hughes Medical Institute
  • National Institutes of Health (R01 NS34389, NS34389)
  • National Institute of Neurological Disorders and Stroke (R01NS040955, R01 NS34389, R01NS034389, NS40955, R01NS036193)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Health Sciences › Medicine › Neurology › Myasthenia Gravis and Thymoma
Keywords
NOVA1, NOVA2, alternative splicing, neuromuscular junction, synaptogenesis, acetylcholine receptor clustering, RNA regulation, synaptic transmission
MeSH terms
Neuro-Oncological Ventral Antigen, Amino Acid Sequence, Animals, Antigens, Neoplasm, Electrophysiology, Embryo, Mammalian, Gene Expression Regulation, Molecular Sequence Data, Nerve Tissue Proteins, Synapses, Motor Neuron Disease, RNA-Binding Proteins, Alternative Splicing, Agrin, Mice, Knockout, Protein Isoforms, Mice

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