Maintenance of RNA homeostasis involves a dynamic balance between RNA synthesis and turnover. This balance is critical for transcriptionally active cells such as neurons, as disruptions to any individual component can lead to RNA misprocessing and cell death. Our preliminary evidence indicates that deficiencies in RNA decay represent a fundamental and heretofore unrecognized mechanism driving neuronal dysfunction and death in the neurodegenerative diseases amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD). Our goals with this proposal are to elucidate the role of RNA decay in the pathogenesis of ALS and FTLD, and investigate a unique and promising therapeutic strategy affecting RNA decay. Based upon the results of initial studies, we propose that in ALS and the most common subtype of FTLD, characterized by neuronal deposits of the RNA binding protein TDP43, RNA homeostasis is disrupted by an inappropriate interaction between TDP43 and the RNA helicase UPF1, ultimately resulting in neurodegeneration. We will test this model by i) determining the impact of the TDP43-UPF1 interaction on neuronal survival and RNA decay, ii) evaluating if deficient RNA decay is sufficient and/or necessary for pathologic TDP43 deposition in neurons, and iii) assessing whether UPF1 expression improves neuronal survival by restoring TDP43 and RNA homeostasis. We will pursue these aims using a combination of longitudinal single-cell microscopy of human neurons derived from ALS and FTLD patients, CRISPR/Cas9 genome editing and high-throughput sequencing of pulse-labeled RNA. The multifaceted approach proposed here promises to uncover key pathways controlling neuronal survival in healthy cells and in those affected by ALS and FTLD, and will bring us one step closer to achieving our long-term goal of developing an effective treatment for these and other relentlessly progressive neurodegenerative disorders.
This proposal focuses on the contribution of RNA decay to neuronal dysfunction and death in the neurodegenerative diseases amyotrophic lateral sclerosis and frontotemporal lobar degeneration. The investigations described here will uncover essential connections between the RNA binding protein TDP43, RNA decay and neurodegeneration that can be leveraged into novel therapeutic strategies. We will also elucidate the mechanism of action of UPF1, a potent neuroprotective agent that has shown promise in disease models.
|Tank, E M; Figueroa-Romero, C; Hinder, L M et al. (2018) Abnormal RNA stability in amyotrophic lateral sclerosis. Nat Commun 9:2845|
|Park, Sei-Kyoung; Arslan, Fatih; Kanneganti, Vydehi et al. (2018) Overexpression of a conserved HSP40 chaperone reduces toxicity of several neurodegenerative disease proteins. Prion 12:16-22|
|Archbold, Hilary C; Jackson, Kasey L; Arora, Ayush et al. (2018) TDP43 nuclear export and neurodegeneration in models of amyotrophic lateral sclerosis and frontotemporal dementia. Sci Rep 8:4606|
|Weskamp, Kaitlin; Barmada, Sami J (2018) TDP43 and RNA instability in amyotrophic lateral sclerosis. Brain Res 1693:67-74|
|Malik, Ahmed M; Miguez, Roberto A; Li, Xingli et al. (2018) Matrin 3-dependent neurotoxicity is modified by nucleic acid binding and nucleocytoplasmic localization. Elife 7:|
|Weskamp, Kaitlin; Barmada, Sami J (2018) RNA Degradation in Neurodegenerative Disease. Adv Neurobiol 20:103-142|
|Wang, Bo; Zeng, Li; Merillat, Sean A et al. (2018) The ubiquitin conjugating enzyme Ube2W regulates solubility of the Huntington's disease protein, huntingtin. Neurobiol Dis 109:127-136|
|Green, Katelyn M; Glineburg, M Rebecca; Kearse, Michael G et al. (2017) RAN translation at C9orf72-associated repeat expansions is selectively enhanced by the integrated stress response. Nat Commun 8:2005|
|Park, Sei-Kyoung; Hong, Joo Y; Arslan, Fatih et al. (2017) Overexpression of the essential Sis1 chaperone reduces TDP-43 effects on toxicity and proteolysis. PLoS Genet 13:e1006805|
|Gupta, Rahul; Lan, Matthews; Mojsilovic-Petrovic, Jelena et al. (2017) The Proline/Arginine Dipeptide from Hexanucleotide Repeat Expanded C9ORF72 Inhibits the Proteasome. eNeuro 4:|
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