Locomotor differences in mice expressing wild-type human α-synuclein.

Area of Science:

• Neuroscience
• Genetics
• Animal Models

Background:

• Parkinson's disease (PD) is a progressive neurodegenerative disorder characterized by dopaminergic neuron loss, dopamine depletion, and Lewy body formation.
• Alpha-synuclein (α-Syn) protein is the primary component of Lewy bodies, making SNCA gene-expressing mouse models valuable for PD research.
• Understanding presymptomatic changes is crucial for developing early interventions for synucleinopathies.

Purpose of the Study:

• To assess the behavioral and motor characteristics of a mouse model (M20) expressing the human wild-type SNCA/α-Syn gene.
• To investigate the role of α-Syn in motor coordination and species-specific behaviors in a presymptomatic synucleinopathy model.

Main Methods:

• Evaluation of locomotor behavior and home cage activity in M20 mice and their wild-type littermate controls.
• Assessment of motor functions including grip endurance, elevated beam traversal, vertical pole descent, and accelerated rod performance.
• Analysis of complex behavioral tasks such as burrowing and nest building.

Main Results:

• M20 mice exhibited abnormal locomotor activity and reduced home cage engagement compared to controls.
• Task-specific motor deficits were observed, including reduced grip endurance and slower elevated beam traversal, but faster vertical pole descent and longer accelerated rod retention.
• Impairments in burrowing and nest building activities were evident in M20 mice.

Conclusions:

• The M20 mouse model displays a range of behavioral and motor alterations relevant to synucleinopathies.
• Alpha-synuclein expression appears to influence motor coordination and the motivation for species-specific behaviors.
• This model offers insights into presymptomatic changes associated with α-Syn accumulation.