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Dysequilibrium syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Dysequilibrium syndrome

Dysequilibrium syndrome (DES) is a group of disorders characterized by abnormal brain development, leading to intellectual disabilities and balance and coordination problems.

Overview

Dysequilibrium syndrome (DES) is a group of disorders characterized by abnormal brain development, which causes intellectual disabilities and problems with balance and coordination (ataxia). The specific signs and symptoms and the severity of the condition can vary among affected individuals.

In people with DES, the part of the brain that coordinates movement (cerebellum) may be unusually small and underdeveloped (cerebellar hypoplasia). This can lead to ataxia that is present from birth and typically does not worsen over time. Additional brain abnormalities may include further loss of tissue (atrophy) in the cerebellum, fewer folds and grooves (gyri) on the surface of the brain, and a small brainstem.

Children with DES may have low muscle tone (hypotonia) and delayed development of motor skills such as walking. Additional features may include intellectual disabilities, rapid involuntary eye movements (nystagmus), eyes that do not look in the same direction (strabismus), difficulty speaking (dysarthria), flat feet (pes planus), seizures, and short stature.

Frequency

The exact prevalence of DES is unknown, but more than 75 cases have been reported in the medical literature.

Causes

Variants in one of several genes cause DES. There are at least four types of DES, each with a different genetic cause. Variants in the VLDLR gene cause a form of DES called type 1, also sometimes called VLDLR-related cerebellar hypoplasia. This is the most common form of DES.

The VLDLR gene provides instructions for making a protein called a very low-density lipoprotein (VLDL) receptor. This protein plays a critical role in guiding developing nerve cells to the appropriate locations in the brain. Many variants in the VLDLR gene prevent cells from producing any functional VLDL receptor protein, which impairs brain development.

Genes Associated with Dysequilibrium Syndrome

  • VLDLR
  • ATP8A2
  • CA8
  • WDR81

Inheritance

DES is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell must have a variant to cause the disorder. The parents of an individual with an autosomal recessive condition each carry one copy of the altered gene, but they typically do not show signs and symptoms of the condition.

Other Names for This Condition

  • CAMRQ
  • CAMRQ syndrome
  • Cerebellar ataxia, impaired intellectual development, and dysequilibrium syndrome
  • Cerebellar ataxia-intellectual disability-dysequilibrium syndrome
  • DES
  • Non-progressive cerebellar ataxia-intellectual disability syndrome

Frequently Asked Questions

The prognosis for DES varies by severity and specific genetic subtype, but a key feature is that the ataxia is typically static, meaning it does not progressively worsen over time. While children may have significant delays in walking and coordination in early childhood, many achieve independent ambulation, though often with a wide-based, unsteady gait. Intellectual disability ranges from mild to severe, and speech delays are common. Unlike neurodegenerative disorders, the brain structure abnormalities in DES are present from birth and do not deteriorate. However, secondary complications such as scoliosis or joint contractures may develop due to long-term muscle imbalance, requiring ongoing orthopedic monitoring.
Diagnosis typically begins with a clinical evaluation of developmental delays, ataxia, and hypotonia. Brain imaging, specifically MRI, is essential to identify characteristic structural abnormalities such as cerebellar hypoplasia (underdeveloped cerebellum), a small brainstem, or reduced gyration on the brain surface. Because DES is a genetic condition, diagnosis is confirmed through genetic testing. This usually involves whole exome sequencing or a targeted gene panel to identify variants in genes such as VLDLR, GPR56, or others associated with DES subtypes. Genetic confirmation is crucial not only for diagnosis but also for providing accurate recurrence risk information for the family and ruling out other conditions with similar symptoms.
Management is multidisciplinary and focuses on maximizing functional independence. Physical therapy is the cornerstone of treatment, emphasizing balance training, core strengthening, and gait training to improve stability and reduce fall risk. Occupational therapy helps with fine motor skills and adaptive equipment for daily activities. Speech therapy is critical for addressing dysarthria (difficulty speaking) and feeding difficulties. For cognitive challenges, special education services and behavioral interventions are tailored to the individual's intellectual level. While there is no cure for the underlying genetic defect, early and consistent intervention significantly improves quality of life and functional outcomes.
There is no specific diet proven to alter the course of dysequilibrium syndrome. However, nutritional support is important due to potential feeding difficulties caused by dysarthria and hypotonia. Infants and young children may require thickened liquids or modified textures to prevent aspiration. Ensuring adequate caloric intake is vital for growth, especially in children with severe developmental delays. Regular monitoring of growth parameters and bone health is recommended, as limited mobility can increase the risk of osteopenia. A dietitian can help tailor nutritional plans to address any swallowing issues or growth concerns specific to the individual.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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