Related Experiment Video
Updated: Nov 16, 2025
Single Synapse Indicators of Glutamate Release and Uptake in Acute Brain Slices from Normal and Huntington Mice
Published on: March 11, 2020
D1R- and D2R-Medium-Sized Spiny Neurons Diversity: Insights Into Striatal Vulnerability to Huntington's Disease
Guendalina Bergonzoni1, Jessica Döring1, Marta Biagioli1
1NeuroEpigenetics Laboratory, Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, Trento, Italy.
Insights
Huntington's disease (HD) selectively damages specific medium-sized spiny neurons (MSNs) in the striatum. Understanding differences between D1R- and D2R-MSNs may reveal new therapeutic targets for HD.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Huntington's disease (HD) is a fatal neurodegenerative disorder.
- It stems from a CAG repeat expansion in the HD gene (HTT).
- Currently, no cure exists for HD, impacting motor and cognitive functions.
Purpose of the Study:
- Investigate the selective vulnerability of striatal medium-spiny neurons (MSNs) in HD.
- Explore the differential susceptibility of D1R-MSNs and D2R-MSNs to the HD mutation.
- Identify potential therapeutic avenues by understanding cell-type-specific gene dysregulation.
Main Methods:
- Comparative analysis of D1R- and D2R-MSN subpopulations.
- Review of existing literature on MSN morphology, electrophysiology, transcriptomics, and functionality.
- Discussion of cell-type-specific gene expression in the context of HD.
Main Results:
- Significant differences exist between D1R- and D2R-MSNs in the striatum.
- These disparities may explain their varied susceptibility to the HD mutation.
- Cellular distinctions include morphology, electrophysiology, transcriptomics, functionality, and localization.
Conclusions:
- Understanding cell type-specific gene dysregulation in the striatum is crucial for HD research.
- Targeting these differences could lead to novel therapeutic interventions for Huntington's disease.
- Further research into MSN subpopulations may improve treatment strategies and patient outcomes.
Abstract:
Huntington's disease (HD) is a devastating neurodegenerative disorder caused by an aberrant expansion of the CAG tract within the exon 1 of the HD gene, HTT. HD progressively impairs motor and cognitive capabilities, leading to a total loss of autonomy and ultimate death. Currently, no cure or effective treatment is available to halt the disease. Although the HTT gene is ubiquitously expressed, the striatum appears to be the most susceptible district to the HD mutation with Medium-sized Spiny Neurons (MSNs) (D1R and D2R) representing 95% of the striatal neuronal population. Why are striatal MSNs so vulnerable to the HD mutation? Particularly, why do D1R- and D2R-MSNs display different susceptibility to HD? Here, we highlight significant differences between D1R- and D2R-MSNs subpopulations, such as morphology, electrophysiology, transcriptomic, functionality, and localization in the striatum. We discuss possible reasons for their selective degeneration in the context of HD. Our review suggests that a better understanding of cell type-specific gene expression dysregulation within the striatum might reveal new paths to therapeutic intervention or prevention to ameliorate HD patients' life expectancy.
