What is Chorea-Acanthocytosis?
Chorea-Acanthocytosis Explained: Genetics, Symptoms & Care Strategies
Chorea-acanthocytosis is a rare inherited condition that disrupts normal body functions. It mainly affects physical and neurological health, leading to challenges in everyday activities and potentially disrupting quality of life. Chorea‑acanthocytosis is extremely rare, with prevalence estimated at <1 per 1,000,000 worldwide.
Beyond the physical symptoms, the disorder can also impact emotional health and social relationships, as movement and coordination difficulties may interfere with daily interactions. Thus, it is crucial to understand its causes and symptoms for early detection and proper treatment.
Keep reading to learn the types of chorea-acanthocytosis, its causes, symptoms and other relevant details.
Genetic Classification of Chorea‑Acanthocytosis
Chorea‑acanthocytosis is a distinct autosomal recessive neurodegenerative disorder caused by VPS13A mutations. It is part of a broader group called neuroacanthocytosis syndromes, which also includes McLeod syndrome and Huntington disease–like 2, but these are separate conditions with different genetic causes.
What are the Causes of Chorea-Acanthocytosis?
Chorea‑acanthocytosis is caused exclusively by autosomal recessive mutations in the VPS13A gene.
Below are the other listed conditions are causes of secondary chorea‑acanthocytosis:
| Causes | Examples |
| Autosomal recessive mutations | Autosomal recessive mutations in VPS13A. |
| Neurologic Conditions | Stroke causes secondary chorea |
| Toxins | Alcohol intoxication, mercury, and carbon monoxide poisoning causes of secondary chorea |
| Drugs and Medications | Amphetamine, cocaine, levodopa (used for Parkinson’s disease), neuroleptics, antihistamines, oral birth control, tricyclics |
| Infectious Causes | Endocarditis, HIV (human immunodeficiency virus), rheumatic fever, Lyme disease, toxoplasmosis, syphilis, subacute sclerosing panencephalitis |
| Endocrine and Metabolic Conditions | Hyperthyroidism, hypomagnesemia, hypoglycemia, kernicterus |
| Malignant Causes | Brain tumor |
| Vascular Conditions | Multiple sclerosis, Behçet’s disease, systemic lupus erythematosus, Churg-Strauss, polycythemia |
What are the Symptoms of Chorea-Acanthocytosis?
Chorea-acanthocytosis usually appears with a mix of movement issues and abnormalities in blood cells. Common symptoms include:
- Involuntary jerky movements (chorea)
- Limb spasms
- Muscle weakness (myopathy)
- Cognitive impairment (problems with learning, memory, and information processing)
- Peripheral neuropathy (numbness, reduced sensation, and weakness in arms and legs)
- Involuntary muscle contractions (dystonia) affecting limbs, face, mouth, tongue, and throat
- Vocal tics such as grunting and involuntary belching
- Seizures (affecting nearly half of individuals)
- Self-injurious behaviours like biting the tongue, lips, and the inside of the mouth
- Difficulty chewing and swallowing due to tongue and throat spasms
- Speech difficulties, which may progress to complete inability to speak
- Obsessive-compulsive behaviours (OCD)
- Poor impulse control and difficulty with self-care
- Behavioural and personality changes
What are the Treatments for Chorea-Acanthocytosis?
The treatment of chorea-acanthocytosis focuses on managing symptoms and improving the patient’s overall well-being through a comprehensive care approach. Listed below are some of the standard treatment options:
1. Medications
Certain medications may be prescribed to help control involuntary movements linked to chorea-acanthocytosis. Several medications may help manage the movement symptoms of chorea-acanthocytosis and pharmacologic treatment is symptomatic only; no therapies have been proven to alter disease progression in chorea‑acanthocytosis. These include:
- Dopamine Receptor Blockers: Haloperidol, fluphenazine, olanzapine, quetiapine, and risperidone. Although primarily used as antipsychotics, these drugs can help reduce chorea symptoms and may be prescribed off-label.
- Dopamine-Depleting Agents: Reserpine and tetrabenazine work by reducing dopamine levels in the brain, which helps manage involuntary movements.
- Benzodiazepines: Clonazepam may also be used to help lessen chorea.
2. Physical Therapy
Physical therapy can help strengthen muscles, improve coordination and balance, and reduce the likelihood of falls.
3. Speech Therapy
Speech therapy plays a key role in addressing speech difficulties and problems with swallowing that some individuals may experience.
4. Psychological Support
Counselling and psychological therapy can offer emotional support to both patients and their families, helping them cope with the mental and emotional effects of the disorder.
5. Nutritional Support
Maintaining adequate nutrition and hydration is vital for managing symptoms and promoting general health.
What are the Complications of Chorea-Acanthocytosis?
As chorea-acanthocytosis progresses, it can lead to serious complications in some individuals, including:
- Loss of the ability to walk independently, often resulting in being confined to a wheelchair or bedridden.
- Severe injuries to the lips and tongue caused by uncontrollable biting.
- Complete loss of speech or the inability to speak.
- Dementia is an ongoing decline in memory and cognitive abilities.
Chorea-acanthocytosis is a complex, rare disorder that affects many aspects of a person’s physical, neurological, and emotional health. Early diagnosis and comprehensive care can help manage symptoms and improve quality of life.
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