1. Characterization of HTT inclusion size, location, and timing in the zQ175 mouse model of Huntington's disease: an in vivo high-content imaging study.
- Author
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Carty N, Berson N, Tillack K, Thiede C, Scholz D, Kottig K, Sedaghat Y, Gabrysiak C, Yohrling G, von der Kammer H, Ebneth A, Mack V, Munoz-Sanjuan I, and Kwak S
- Subjects
- Animals, Cerebral Cortex metabolism, Corpus Striatum metabolism, Disease Models, Animal, Fluorescent Antibody Technique, Gene Knockdown Techniques, Heterozygote, Huntingtin Protein, Huntington Disease pathology, Intranuclear Inclusion Bodies, Mice, Mice, Transgenic, Phenotype, Protein Aggregation, Pathological, Protein Transport, Huntington Disease genetics, Huntington Disease metabolism, Inclusion Bodies, Nerve Tissue Proteins genetics, Nerve Tissue Proteins metabolism, Nuclear Proteins genetics, Nuclear Proteins metabolism
- Abstract
Huntington's disease (HD) is an autosomal dominant neurodegenerative disorder caused by a CAG trinucleotide repeat expansion in the huntingtin gene. Major pathological hallmarks of HD include inclusions of mutant huntingtin (mHTT) protein, loss of neurons predominantly in the caudate nucleus, and atrophy of multiple brain regions. However, the early sequence of histological events that manifest in region- and cell-specific manner has not been well characterized. Here we use a high-content histological approach to precisely monitor changes in HTT expression and characterize deposition dynamics of mHTT protein inclusion bodies in the recently characterized zQ175 knock-in mouse line. We carried out an automated multi-parameter quantitative analysis of individual cortical and striatal cells in tissue slices from mice aged 2-12 months and confirmed biochemical reports of an age-associated increase in mHTT inclusions in this model. We also found distinct regional and subregional dynamics for inclusion number, size and distribution with subcellular resolution. We used viral-mediated suppression of total HTT in the striatum of zQ175 mice as an example of a therapeutically-relevant but heterogeneously transducing strategy to demonstrate successful application of this platform to quantitatively assess target engagement and outcome on a cellular basis.
- Published
- 2015
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