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A Simple Composite Phenotype Scoring System for Evaluating Mouse Models of Cerebellar Ataxia
Published on: May 21, 2010
SCA Functional Index: a useful compound performance measure for spinocerebellar ataxia
T Schmitz-Hübsch1, P Giunti, D A Stephenson
1Department of Neurology, University Hospital of Bonn, Sigmund-Freud-Str 25, D-53105 Bonn, Germany. tanja.schmitz-huebsch@ukb.uni-bonn.de
Neurology
|August 13, 2008
Summary
Functional measures like the 8-meter walk test and 9-hole peg test, along with a new composite index (SCAFI), effectively assess spinocerebellar ataxia (SCA) progression. SCAFI demonstrated stronger correlations and fewer floor effects than individual tests.
Area of Science:
- Neurology
- Clinical Assessment
- Ataxia Research
Background:
- Spinocerebellar ataxia (SCA) encompasses a group of progressive neurodegenerative disorders.
- Accurate functional measures are crucial for tracking disease progression and evaluating therapeutic interventions in SCA patients.
Purpose of the Study:
- To evaluate the utility of three functional measures: 8-meter walking time (8MW), 9-hole peg test (9HPT), and PATA repetition rate.
- To develop and validate a composite functional index (SCAFI) for assessing SCA patients.
Main Methods:
- A multicenter trial involving 412 patients with autosomal dominant SCA (genotypes 1, 2, 3, and 6).
- Assessment of 8MW, 9HPT, and PATA repetition rate, with subsequent transformation to create the SCAFI.
- Correlation analysis of subtest and SCAFI Z-scores with the Scale for the Assessment and Rating of Ataxia (SARA), Unified Huntington's disease Rating Scale functional assessment, and disease duration.
Main Results:
- Performance times for 8MW and 9HPT were skewed, while PATA rate was normally distributed; learning effects were minimal.
- The composite SCAFI showed stronger correlations with SARA, functional assessment, and disease duration compared to individual measures.
- SCAFI demonstrated a linear decline across disease severity, avoiding the floor effects observed with 8MW and 9HPT.
Conclusions:
- The proposed functional measures, particularly the composite SCAFI, possess favorable properties for assessing SCA patients.
- SCAFI offers a robust and sensitive tool for monitoring disease progression in spinocerebellar ataxia.
