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Dramatic tissue-specific mutation length increases are an early molecular event in Huntington disease pathogenesis
Laura Kennedy1, Elizabeth Evans, Chiung-Mei Chen
1Division of Molecular Genetics, Faculty of Biomedical and Life Scienes, University of Glasgow, Anderson College Complex, 56 Dumbarton Road, Glasgow G11 6NU, UK.
Human Molecular Genetics
|October 23, 2003
Summary
Huntington disease (HD) involves CAG repeat expansions. Early in HD, striatal cells show significant CAG repeat length increases, suggesting a role in disease progression and selectivity.
Area of Science:
- Genetics
- Neuroscience
- Molecular Biology
Background:
- Huntington disease (HD) is a neurodegenerative disorder caused by CAG repeat expansions in the huntingtin gene.
- Mutant huntingtin protein leads to widespread expression, but neuropathology is most prominent in the striatum.
Purpose of the Study:
- To investigate somatic CAG repeat length changes in human striatal cells during early Huntington disease.
- To explore the influence of initial CAG repeat size on mutation variability and disease onset in mouse models.
Main Methods:
- Analysis of CAG repeat length in human striatal cells.
- Studies using knock-in Huntington disease mouse models.
Main Results:
- Dramatic increases in CAG repeat length (up to 1000 repeats) were observed in human striatal cells early in HD.
- Initial CAG repeat size influences age-dependent, expansion-biased mutation length variability and disease onset in mouse models.
Conclusions:
- Somatic CAG repeat expansion in striatal cells likely contributes to the progressive nature and cell-selective pathology of Huntington disease.
- Understanding these dynamic mutation changes is crucial for HD pathogenesis research.