TDP-43 toxic gain of function links ALS, FTD and Alzheimer's Disease through splicing dysregulation.

ABSTRACT: Loss of nuclear TDP-43 splicing activity is a common feature across neurodegenerative diseases including amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD), but its relevance to Alzheimer's disease (AD) remains unclear. Here, we show that TDP-43 pathology in AD is broadly associated with splicing abnormalities, including aberrant splicing of amyloid precursor protein (APP). TDP-43 drives the formation of elongated APP isoforms, disrupting alternative splicing across ALS, FTLD-TDP and AD, providing a compelling mechanism for a long-standing observation of APP isoform dysregulation. We further establish a mechanistic link between TDP-43, APP splicing, and Aβ pathology. Surprisingly, the disruption to alternative APP splicing is mediated by a toxic gain of cytopl

SUBMITTER: van Zuiden W 

PROVIDER: S-EPMC12247699 | biostudies-literature | 2025 May

REPOSITORIES: biostudies-literature