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Mutations in hnRNP A1 drive neurodegeneration and alternative RNA splicing of neuronal gene targets.
Neurobiol Dis
January 2025
Office of the Saskatchewan Multiple Sclerosis Clinical Research Chair, University of Saskatchewan, Saskatoon, SK S7K 0M7, Canada; Neurology Division, Department of Medicine, University of Saskatchewan, Saskatoon, SK S7N 0X8, Canada. Electronic address:
RNA binding protein dysfunction is a pathogenic feature of multiple neurological diseases, including multiple sclerosis (MS). Neurodegeneration (the loss of, or damage to neurons and axons) is the primary driver of disease progression in MS. Herein, we utilized a novel, neuron-specific model of neurodegeneration by transducing primary mouse neurons with mutant forms of the RNA binding protein heterogeneous nuclear ribonucleoprotein A1 (hnRNP A1) identified from MS patients, including one within the M9-nuclear localization sequence of hnRNP A1 (A1(P275S)) and a second in the prion-like domain of hnRNP A1 (A1(F263S)) to test the hypothesis that neuronal hnRNP A1 dysfunction drives neurodegeneration in MS.
View Article and Find Full Text PDFFunctional classification of tauopathy strains reveals the role of protofilament core residues.
Sci Adv
January 2025
Center for Alzheimer's and Neurodegenerative Diseases, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Distinct tau amyloid assemblies underlie diverse tauopathies but defy rapid classification. Cell and animal experiments indicate tau functions as a prion, as different strains propagated in cells cause unique, transmissible neuropathology after inoculation. Strain amplification requires compatibility of the monomer and amyloid template.
View Article and Find Full Text PDFCofactors facilitate bona fide prion misfolding in vitro but are not necessary for the infectivity of recombinant murine prions.
PLoS Pathog
January 2025
Center for Cooperative Research in Biosciences (CIC BioGUNE), Basque Research and Technology Alliance (BRTA), Derio, Spain.
Prion diseases, particularly sporadic cases, pose a challenge due to their complex nature and heterogeneity. The underlying mechanism of the spontaneous conversion from PrPC to PrPSc, the hallmark of prion diseases, remains elusive. To shed light on this process and the involvement of cofactors, we have developed an in vitro system that faithfully mimics spontaneous prion misfolding using minimal components.
View Article and Find Full Text PDFConnectome-based biophysical models of pathological protein spreading in neurodegenerative diseases.
PLoS Comput Biol
January 2025
Research Center for Social Computing and Information Retrieval, Harbin Institute of Technology, Harbin, China.
Neurodegenerative diseases are a group of disorders characterized by progressive degeneration or death of neurons. The complexity of clinical symptoms and irreversibility of disease progression significantly affects individual lives, leading to premature mortality. The prevalence of neurodegenerative diseases keeps increasing, yet the specific pathogenic mechanisms remain incompletely understood and effective treatment strategies are lacking.
View Article and Find Full Text PDFBrain-derived tau oligomer polymorphs: distinct aggregations, stability profiles, and biological activities.
Commun Biol
January 2025
Mitchell Center for Neurodegenerative Diseases, University of Texas Medical Branch, Galveston, TX, USA.
Aggregation of microtubule-associated tau protein is a distinct hallmark of several neurodegenerative disorders such as Alzheimer's disease (AD), dementia with Lewy bodies (DLB), and progressive supranuclear palsy (PSP). Tau oligomers are suggested to be the primary neurotoxic species that initiate aggregation and propagate prion-like structures. Furthermore, different diseases are shown to have distinct structural characteristics of aggregated tau, denoted as polymorphs.
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