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Parkinsonism, FXTAS, and FMR1 premutations
Mathias Toft1, Jan Aasly, Gina Bisceglio
1Department of Neuroscience, Mayo Clinic, Jacksonville, Florida, USA.
Movement Disorders : Official Journal of the Movement Disorder Society
|September 25, 2004
Summary
Fragile X-associated tremor/ataxia syndrome (FXTAS) can cause parkinsonism. This study found no association between expanded FMR1 gene repeats and Parkinson
Area of Science:
- Genetics
- Neurology
- Molecular Biology
Background:
- Late-onset neurological symptoms, including parkinsonism, have been observed in male carriers of fragile X mental retardation 1 (FMR1) gene premutation expansions, a condition known as fragile X-associated tremor/ataxia syndrome (FXTAS).
- Parkinson's disease (PD) is a neurodegenerative disorder characterized by motor symptoms similar to those seen in FXTAS.
Purpose of the Study:
- To investigate the potential association between expanded FMR1 gene alleles and the development of Parkinson's disease (PD).
- To determine if FMR1 gene CGG repeat size is a risk factor for PD in males presenting with parkinsonism.
Main Methods:
- Analysis of FMR1 gene CGG repeat size in 414 male patients diagnosed with parkinsonism, predominantly PD.
- Categorization of repeat sizes into intermediate (41-54 CGG repeats) and premutation (55-200 CGG repeats) ranges.
Main Results:
- No patients in the study cohort exhibited expanded FMR1 repeats within the premutation range associated with FXTAS.
- A small percentage of patients (1.2%) carried intermediate-size FMR1 alleles (41-54 CGG repeats).
Conclusions:
- The findings suggest that expansions within the FMR1 gene are not associated with Parkinson's disease in the studied cohort.
- Further research may be needed to clarify the role of intermediate FMR1 alleles in neurological disorders.