Longitudinal diffusion tensor magnetic resonance imaging analysis at the cohort level reveals disturbed cortical and callosal microstructure with spared corticospinal tract in the TDP-43 G298S ALS mouse model

Hans Peter Müller, David Brenner, Francesco Roselli, Diana Wiesner, Alireza Abaei, Martin Gorges, Karin M. Danzer, Albert C. Ludolph, William Tsao, Philip C. Wong, Volker Rasche, Jochen H. Weishaupt, Jan Kassubek

Research output: Contribution to journalArticlepeer-review

Abstract

Background: In vivo diffusion tensor imaging (DTI) of the mouse brain was used to identify TDP-43 associated alterations in a mouse model for amyotrophic lateral sclerosis (ALS). Methods: Ten mice with TDP-43 G298S overexpression under control of the Thy1.2 promoter and 10 wild type (wt) underwent longitudinal DTI scans at 11.7 T, including one baseline and one follow-up scan with an interval of about 5 months. Whole brain-based spatial statistics (WBSS) of DTI-based parameter maps was used to identify longitudinal alterations of TDP-43 G298S mice compared to wt at the cohort level. Results were supplemented by tractwise fractional anisotropy statistics (TFAS) and histological evaluation of motor cortex for signs of neuronal loss. Results: Alterations at the cohort level in TDP-43 G298S mice were observed cross-sectionally and longitudinally in motor areas M1/M2 and in transcallosal fibers but not in the corticospinal tract. Neuronal loss in layer V of motor cortex was detected in TDP-43 G298S at the later (but not at the earlier) timepoint compared to wt. Conclusion: DTI mapping of TDP-43 G298S mice demonstrated progression in motor areas M1/M2. WBSS and TFAS are useful techniques to localize TDP-43 G298S associated alterations over time in this ALS mouse model, as a biological marker.

Original languageEnglish (US)
Article number27
JournalTranslational Neurodegeneration
Volume8
Issue number1
DOIs
StatePublished - Aug 30 2019

Keywords

  • Amyotrophic lateral sclerosis
  • Diffusion tensor imaging
  • Fiber tracking
  • Mouse brain
  • Mutant TDP-43

ASJC Scopus subject areas

  • Clinical Neurology
  • Cognitive Neuroscience
  • Cellular and Molecular Neuroscience

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