Background: Mutant transactive response DNA-binding protein (TDP-43) is closely
correlated to the inherited form of amyotrophic lateral sclerosis (ALS). TDP-43 transgenic rats can
reproduce the core phenotype of ALS and constitutive expression of TDP-43 caused postnatal
Objective: The study aimed to understand whether neurologic deficiency caused by mutant TDP-
43 is dependent on its temporal expression.
Method: Transgenic rats were established that express mutant human TDP-43 (M337V substitution)
in neurons, then a Tet-off system was used to regulate its expression.
Results: TDP-43 mutant transgenic rats developed significant weakness after the transgene was
activated. Rats with expression of mutant TDP-43 at 30 days showed a more aggressive phenotype.
More severe pathological changes in neurogenic atrophy were observed in these rats.
Conclusion: Temporal expression of mutant TDP-43 in neurons promoted serious phenotype in
rats. The dysfunction of TDP-43 had a profound impact on the development of motor neurons and