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Basic Science and Pathogenesis.

Daniel W Fisher1, Caitlyn Schaffer1, Christian Battaglia1

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Aging surprisingly protected against ALS-like symptoms in a novel mouse model. This study developed a new tool for studying TDP-43 proteinopathies and aging, revealing unexpected age-related resilience.

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Area of Science:

  • Neuroscience
  • Aging Research
  • Genetics

Background:

  • Aging is the primary risk factor for neurodegenerative diseases such as ALS.
  • The role of aging in protein aggregation and neurodegeneration remains unclear.
  • Investigating how aging processes influence disease pathogenicity is crucial.

Purpose of the Study:

  • To develop a novel mouse model for studying TDP-43 proteinopathies and ALS.
  • To investigate the impact of aging on the development of ALS-like phenotypes.
  • To explore the temporal and dosage effects of TDP-43 overexpression.

Main Methods:

  • Developed an AAV-based mouse model (AAV-hTDP43) for neuron-specific TDP-43 overexpression.
  • Administered viral vectors to young and old mice, monitoring weight, neuromuscular score, and tremors.
  • Conducted behavioral tests (open field, Y-maze, rotarod) and analyzed CNS tissue for pathology.

Main Results:

  • Overexpression of hTDP-43 in young mice induced ALS-like symptoms, including motor deficits and mortality, which were dose-dependent.
  • Surprisingly, old mice exhibited significantly less severe weight loss, neuromuscular impairment, and mortality compared to young mice.
  • Viral infectivity was similar in young and old mice, ruling out age-related differences in viral uptake.

Conclusions:

  • A novel, temporally controlled mouse model for TDP-43 proteinopathies was successfully developed.
  • Aging demonstrated a protective effect against the acute TDP-43-induced ALS-like phenotype.
  • Further research is needed to elucidate the mechanisms underlying this age-related resilience.