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Updated: Mar 9, 2026
A Simple Composite Phenotype Scoring System for Evaluating Mouse Models of Cerebellar Ataxia
Published on: May 21, 2010
Motor Dysfunctions and Neuropathology in Mouse Models of Spinocerebellar Ataxia Type 2: A Comprehensive Review
João M Da Conceição Alves-Cruzeiro1, Liliana Mendonça1, Luís Pereira de Almeida2
1Center for Neuroscience and Cell Biology, University of Coimbra Coimbra, Portugal.
Abstract:
Spinocerebellar ataxia type 2 (SCA2) is an autosomal dominant ataxia caused by an expansion of CAG repeats in the exon 1 of the gene ATXN2, conferring a gain of toxic function that triggers the appearance of the disease phenotype. SCA2 is characterized by several symptoms including progressive gait ataxia and dysarthria, slow saccadic eye movements, sleep disturbances, cognitive impairments, and psychological dysfunctions such as insomnia and depression, among others. The available treatments rely on palliative care, which mitigate some of the major symptoms but ultimately fail to block the disease progression. This persistent lack of effective therapies led to the development of several models in yeast, C. elegans, D. melanogaster, and mice to serve as platforms for testing new therapeutic strategies and to accelerate the research on the complex disease mechanisms. In this work, we review 4 transgenic and 1 knock-in mouse that exhibit a SCA2-related phenotype and discuss their usefulness in addressing different scientific problems. The knock-in mice are extremely faithful to the human disease, with late onset of symptoms and physiological levels of mutant ataxin-2, while the other transgenic possess robust and well-characterized motor impairments and neuropathological features. Furthermore, a new BAC model of SCA2 shows promise to study the recently explored role of non-coding RNAs as a major pathogenic mechanism in this devastating disorder. Focusing on specific aspects of the behavior and neuropathology, as well as technical aspects, we provide a highly practical description and comparison of all the models with the purpose of creating a useful resource for SCA2 researchers worldwide.
Insights
Researchers reviewed mouse models for spinocerebellar ataxia type 2 (SCA2), a genetic neurodegenerative disorder. These models aid in understanding SCA2 mechanisms and testing new therapies for this debilitating condition.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Spinocerebellar ataxia type 2 (SCA2) is a neurodegenerative disorder caused by expanded CAG repeats in the ATXN2 gene, leading to toxic gain-of-function.
- Current treatments for SCA2 are palliative, highlighting the urgent need for disease-modifying therapies.
- Animal models are crucial for dissecting SCA2 pathogenesis and evaluating therapeutic strategies.
Approach:
- This review analyzes four transgenic and one knock-in mouse models of SCA2.
- The models are evaluated based on their fidelity to human disease phenotypes, including late-onset symptoms and physiological mutant ataxin-2 levels.
- The utility of a new BAC model for studying non-coding RNA roles in SCA2 is also discussed.
Key Points:
- Knock-in mice offer high fidelity to human SCA2, exhibiting late-onset symptoms.
- Transgenic models provide robust motor impairments and neuropathological features.
- A novel BAC model shows potential for investigating non-coding RNA involvement in SCA2.
Conclusions:
- A comprehensive comparison of available SCA2 mouse models is provided.
- This resource aims to guide researchers in selecting appropriate models for specific scientific questions.
- The reviewed models are essential for advancing research into SCA2 mechanisms and developing effective treatments.
