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Huntington's disease: diagnosis and management
Thomas B Stoker1, Sarah L Mason2, Julia C Greenland2
1John van Geest Centre for Brain Repair, Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK tbs26@cantab.net.
Insights
Huntington's disease (HD) diagnosis relies on genetic testing for CAG repeat length. Early identification is crucial for managing this inherited neurodegenerative disorder and considering new therapies.
Area of Science:
- Neuroscience
- Genetics
- Neurology
Background:
- Huntington's disease (HD) is an inherited neurodegenerative disorder.
- It presents with characteristic neuropsychiatric, motor (chorea), and cognitive symptoms.
- Diagnosis is typically confirmed by identifying expanded CAG repeat lengths in the huntingtin gene.
Purpose of the Study:
- To highlight the diagnostic criteria and challenges in Huntington's disease.
- To emphasize the importance of genetic testing and considering differential diagnoses.
- To discuss the management of HD patients, especially in the context of emerging therapies.
Main Methods:
- Review of diagnostic criteria for Huntington's disease.
- Genetic testing for CAG repeat expansion in the huntingtin gene.
- Clinical assessment of neuropsychiatric, motor, and cognitive symptoms.
Main Results:
- Standard diagnosis involves genetic confirmation of CAG repeat expansion.
- Challenges exist in distinguishing asymptomatic carriers from early disease states.
- Mimicking conditions necessitate consideration, particularly with negative genetic tests.
Conclusions:
- Accurate diagnosis of Huntington's disease is essential, especially with new therapies in development.
- Multidisciplinary specialist clinics are optimal for patient management and genetic testing.
- Current treatments are primarily symptomatic for chorea and behavioral issues, with limited trial support.
Abstract:
Huntington's disease (HD) is an inherited neurodegenerative disease characterised by neuropsychiatric symptoms, a movement disorder (most commonly choreiform) and progressive cognitive impairment. The diagnosis is usually confirmed through identification of an increased CAG repeat length in the huntingtin gene in a patient with clinical features of the condition. Though diagnosis is usually straightforward, unusual presentations can occur, and it can be difficult to know when someone has transitioned from being an asymptomatic carrier into the disease state. This has become increasingly important recently, with several putative disease-modifying therapies entering trials. A growing number of conditions can mimic HD, including rare genetic causes, which must be considered in the event of a negative HD genetic test. Patients are best managed in specialist multidisciplinary clinics, including when considering genetic testing. Current treatments are symptomatic, and largely directed at the chorea and neurobehavioural problems, although supporting trial evidence for these is often limited.
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