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Updated: Jul 24, 2026
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Immunohistochemical Visualization of Hippocampal Neuron Activity After Spatial Learning in a Mouse Model of Neurodevelopmental Disorders
Published on: May 12, 2015
Selective discrimination learning impairments in mice expressing the human Huntington's disease mutation
L A Lione1, R J Carter, M J Hunt
1Department of Pharmacology, Cambridge Centre for Brain Repair, University of Cambridge, United Kingdom.
Summary
Huntington's disease (HD) mouse models show early cognitive decline before motor symptoms. R6/2 mice exhibit progressive learning impairments, mirroring human HD cognitive deficits.
Area of Science:
- Neuroscience
- Genetics
- Behavioral Science
Background:
- Huntington's disease (HD) is characterized by progressive cognitive decline.
- Early cognitive impairment precedes motor symptoms in human HD patients.
- Transgenic mouse models are crucial for studying HD pathogenesis and testing therapies.
Purpose of the Study:
- To investigate the cognitive performance of R6/2 mice, a model for Huntington's disease.
- To characterize the onset and progression of learning deficits in R6/2 mice.
- To evaluate the utility of R6/2 mice for studying trinucleotide repeat disorders and therapeutic strategies.
Main Methods:
- Behavioral testing of R6/2 transgenic mice and wild-type littermates (3-14.5 weeks of age).
- Utilized four cognitive tasks: Morris water maze, visual cliff avoidance, two-choice swim tank, and T-maze.
- Assessed learning and memory deficits at different ages to track disease progression.
Main Results:
- R6/2 mice exhibited progressive learning impairments in all four cognitive tasks between 3.5 and 8 weeks of age.
- Cognitive deficits appeared before the onset of overt motor symptoms (around 8 weeks).
- The age of onset and progression varied across tasks, reflecting specific neural circuit involvement (frontostriatal and hippocampal).
Conclusions:
- R6/2 mice display progressive learning deficits analogous to human Huntington's disease cognitive impairments.
- These mice serve as a valuable model for understanding cognitive dysfunction in trinucleotide repeat disorders.
- The R6/2 model provides a framework for evaluating the efficacy of potential therapeutic interventions for HD.
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