Behaviour changes in a transgenic model of Huntington's disease

Area of Science:

• Neuroscience
• Genetics
• Animal Models

Background:

• Huntington's disease (HD) is an autosomal dominant inherited neurodegenerative disorder.
• It stems from an expanded polyglutamine region in the huntingtin protein, with its precise function remaining unclear.
• Transgenic mice expressing an N-terminal huntingtin fragment with 82 glutamines model HD's progressive nature.

Purpose of the Study:

• To longitudinally assess behavioral changes in a transgenic mouse model of Huntington's disease.
• To evaluate motor performance and anxiety levels using open-field and elevated-plus-maze tests.
• To determine the suitability of these tests for tracking HD progression and therapeutic intervention efficacy.

Main Methods:

• Utilized transgenic mice expressing the N-terminal of huntingtin with 82 glutamines.
• Conducted longitudinal behavioral assessments using open-field and elevated-plus-maze tests.
• Monitored motor performance (distance, velocity, exploration) and anxiety levels over time.

Main Results:

• Motor performance significantly deteriorated by 12 weeks of age in transgenic mice.
• Progressive decline observed in total distance covered, mean velocity, and exploratory behavior.
• No significant difference in anxiety levels was detected between transgenic mice and littermate controls.

Conclusions:

• The tested behavioral paradigms are effective for monitoring Huntington's disease progression in this mouse model.
• Motor deterioration observed aligns with other HD models, but anxiety levels differ.
• These findings support the utility of these tests for future Huntington's disease therapeutic studies.