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Androgen receptor mutation in Kennedy's disease
K H Fischbeck1, A Lieberman, C K Bailey
1Neurogenetics Branch, National Institute of Neurological Diseases and Stroke, National Institutes of Health, Bethesda, MD 20892, USA.
Summary
Kennedy's disease, a neurodegenerative disorder, results from a mutation in the androgen receptor gene. Research shows this mutation causes a toxic gain of function, leading to motor neuron disease.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Kennedy's disease is an X-linked motor neuron disease.
- It is caused by an expanded polyglutamine repeat in the androgen receptor gene.
- The mutation leads to a toxic gain of function, similar to other polyglutamine expansion diseases.
Purpose of the Study:
- To investigate the molecular mechanisms underlying Kennedy's disease.
- To explore the toxic gain of function caused by androgen receptor gene mutations.
- To establish and utilize model systems for studying the disease.
Main Methods:
- Utilizing transgenic animal models.
- Employing neuronal cell culture systems.
- Analyzing autopsy samples from patients.
Main Results:
- The neurodegenerative phenotype of Kennedy's disease was successfully reproduced in model systems.
- Nuclear inclusions of mutant androgen receptor protein were observed in these models.
- Similar inclusions were identified in autopsy samples from patients.
Conclusions:
- The expanded polyglutamine repeat in the androgen receptor is the primary cause of Kennedy's disease.
- A toxic gain of function mechanism is implicated in the disease pathogenesis.
- Model systems are valuable tools for studying Kennedy's disease and developing potential therapies.