TY - JOUR T1 - Motivational, proteostatic and transcriptional deficits precede synapse loss, gliosis and neurodegeneration in the B6.<em>Htt</em><sup><em>Q111/+</em></sup> model of Huntington’s disease JF - bioRxiv DO - 10.1101/081109 SP - 081109 AU - Robert M. Bragg AU - Sydney R. Coffey AU - Rory M. Weston AU - Seth A. Ament AU - Jeffrey P. Cantle AU - Shawn Minnig AU - Cory C. Funk AU - Dominic D. Shuttleworth AU - Emily L. Woods AU - Bonnie R. Sullivan AU - Lindsey Jones AU - Anne Glickenhaus AU - John S. Anderson AU - Michael D. Anderson AU - Stephen B. Dunnett AU - Vanessa C. Wheeler AU - Marcy E. MacDonald AU - Simon P. Brooks AU - Nathan D. Price AU - Jeffrey B. Carroll Y1 - 2016/01/01 UR - http://biorxiv.org/content/early/2016/10/14/081109.abstract N2 - We investigated the appearance and progression of disease-relevant signs in the B6.HttQ111/+ mouse, a genetically precise model of the mutation that causes Huntington’s disease (HD). We find that B6.HttQ111/+ mice are healthy, show no overt signs of central or peripheral inflammation, and no gross motor impairment as late as 12 months of age. Behaviorally, we find that 4-9 month old B6.HttQ111/+ mice have normal activity levels and show no clear signs of anxiety or depression, but do show clear signs of reduced motivation. The neuronal density, neuronal size, synaptic density and number of glia is normal in B6.HttQ111/+ striatum, the most vulnerable brain region in HD, up to 12 months of age. Despite this preservation of the synaptic and cellular composition of the striatum, we observe clear progressive, striatal-specific, transcriptional dysregulation and accumulation of neuronal intranuclear inclusions (NIIs). Simulation studies suggest these molecular endpoints are sufficiently robust for future preclinical studies, and that B6.HttQ111/+ mice are a useful tool for modeling disease-modifying or neuroprotective strategies for disease processes before the onset of overt phenotypes. ER -