TDP-43-mediated neuron loss in vivo requires RNA-binding activity.

• Main Authors: Aaron Voigt, David Herholz, Fabienne C Fiesel, Kavita Kaur, Daniel Müller, Peter Karsten, Stephanie S Weber, Philipp J Kahle, Till Marquardt, Jörg B Schulz
• Format: Article
• Language: English
• Published: Public Library of Science (PLoS) 2010-01-01
• Series: PLoS ONE
• Online Access: http://europepmc.org/articles/PMC2923622?pdf=render

Alteration and/or mutations of the ribonucleoprotein TDP-43 have been firmly linked to human neurodegenerative diseases, including amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD). The relative impacts of TDP-43 alteration, mutation, or inherent protein function on neural integrity, however, remain less clear--a situation confounded by conflicting reports based on transient and/or random-insertion transgenic expression. We therefore performed a stringent comparative investigation of impacts of these TDP-43 modifications on neural integrity in vivo. To achieve this, we systematically screened ALS/FTLD-associated and synthetic TDP-43 isoforms via same-site gene insertion and neural expression in Drosophila; followed by transposon-based motor neuron-specific transgenesis in a chick vertebrate system. Using this bi-systemic approach we uncovered a requirement of inherent TDP-43 RNA-binding function--but not ALS/FTLD-linked mutation, mislocalization, or truncation--for TDP-43-mediated neurotoxicity in vivo.