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Dopamine transporter deficiency syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Conditions

Dopamine transporter deficiency syndrome

Dopamine transporter deficiency syndrome is a rare, progressive movement disorder characterized by infantile-onset parkinsonism-dystonia. It is caused by genetic mutations that disrupt dopamine signaling in the brain, leading to severe motor and neurological challenges.

Overview

Dopamine transporter deficiency syndrome is a rare movement disorder. The condition is also known as infantile parkinsonism-dystonia because the problems with movement usually start in infancy and worsen over time. However, the features of the condition sometimes do not appear until childhood or later.

Symptoms

People with dopamine transporter deficiency syndrome develop a pattern of involuntary, sustained muscle contractions known as dystonia. The dystonia is widespread (generalized), affecting many different muscles. The continuous muscle cramping and spasms cause difficulty with basic activities, including:

  • Speaking
  • Eating
  • Drinking
  • Picking up objects
  • Walking

As the condition worsens, affected individuals develop parkinsonism, which is a group of movement abnormalities including:

  • Tremors
  • Unusually slow movement (bradykinesia)
  • Rigidity
  • An inability to hold the body upright and balanced (postural instability)

Other signs and symptoms that can develop include:

  • Abnormal eye movements
  • Reduced facial expression (hypomimia)
  • Disturbed sleep
  • Frequent episodes of pneumonia
  • Problems with digestion, including a backflow of acidic stomach contents into the esophagus (gastroesophageal reflux) and constipation

People with dopamine transporter deficiency syndrome may have a shortened lifespan, although the long-term effects of this condition are not fully understood. Children with this condition have died from pneumonia and breathing problems. When the first signs and symptoms appear later in life, affected individuals may survive into adulthood.

Frequency

Dopamine transporter deficiency syndrome appears to be a rare disease; only about 20 affected individuals have been described in the medical literature. Researchers believe that the condition is probably underdiagnosed because its signs and symptoms overlap with cerebral palsy and other movement disorders.

Causes & Risk Factors

Dopamine transporter deficiency syndrome is caused by mutations in the SLC6A3 gene. This gene provides instructions for making a protein called the dopamine transporter. This protein is embedded in the membrane of certain nerve cells (neurons) in the brain, where it transports a molecule called dopamine into the cell. Dopamine is a chemical messenger (neurotransmitter) that relays signals from one neuron to another. Dopamine has many important functions, including playing complex roles in thought (cognition), motivation, behavior, and control of movement.

Mutations in the SLC6A3 gene impair or eliminate the function of the dopamine transporter. The resulting shortage (deficiency) of functional transporter disrupts dopamine signaling in the brain. Although dopamine has a critical role in controlling movement, it is unclear how altered dopamine signaling causes the specific movement abnormalities found in people with dopamine transporter deficiency syndrome.

Studies suggest that the age at which signs and symptoms appear is related to how severely the function of the dopamine transporter is affected. Affected individuals who develop movement problems starting in infancy most often have transporter activity that is less than 5 percent of normal. Those whose movement problems appear in childhood or later tend to have somewhat higher levels of transporter activity, although they are still lower than normal. Researchers speculate that higher levels of transporter activity may delay the onset of the disease in these individuals.

Inheritance

This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

Other Names for This Condition

  • DTDS
  • Infantile parkinsonism-dystonia
  • Parkinsonism-dystonia, infantile
  • PKDYS

Frequently Asked Questions

Yes, dopamine transporter deficiency syndrome is an inherited condition caused by genetic mutations that disrupt dopamine signaling in the brain. It is typically inherited in an autosomal recessive pattern, meaning a child must inherit two copies of the mutated gene (one from each parent) to develop the disorder. For families with an affected child, genetic counseling is highly recommended to understand the inheritance pattern, assess the risk of recurrence in future pregnancies, and discuss options for genetic testing for family members or prenatal diagnosis.
The earliest signs of dopamine transporter deficiency syndrome typically appear in infancy, often presenting as generalized dystonia, which involves involuntary, sustained muscle contractions and spasms affecting many different muscles. Parents might notice difficulty with basic activities such as feeding, speaking, or picking up objects, along with unusual eye movements or reduced facial expression. Given the progressive nature of the condition, immediate medical evaluation is crucial if an infant shows these severe and worsening movement abnormalities.
The main treatment goals for dopamine transporter deficiency syndrome are to manage symptoms, improve quality of life, and prevent complications, as there is currently no cure. Supportive therapies include physical, occupational, and speech therapy to help maintain motor skills, improve communication, and assist with feeding. Medications may be used to address specific symptoms like dystonia or parkinsonism, though responses can vary. Nutritional support and management of gastrointestinal issues are also critical.
The most serious complications of dopamine transporter deficiency syndrome often involve the respiratory and digestive systems. Frequent episodes of pneumonia and other breathing problems are a major concern, especially in children, and can be life-threatening. Digestive issues like gastroesophageal reflux and constipation are also common. Monitoring involves regular medical check-ups, respiratory assessments, and nutritional evaluations. Prevention strategies include vigilant management of swallowing difficulties to prevent aspiration, prompt treatment of respiratory infections, and dietary or medication interventions for digestive problems.
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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