Dopa-Responsive Dystonia: Symptoms, Causes, Treatments

Author: Thomas C. Weiss
Published: 1 May 2015 - Updated: 22 Aug 2026
Publication Type: Informative

Table of Contents:
Synopsis - Definition - Overview - FAQs - Insights, Updates - Related Content

Synopsis

This information explains dopa-responsive dystonia (DRD), also called Segawa's disease, a hereditary movement disorder that usually appears in early childhood between the ages of five and eight and is marked by progressive difficulty with walking. Because leg spasticity and gait problems mimic cerebral palsy, children are frequently misdiagnosed, which matters greatly since untreated patients often require Achilles tendon surgery by age 21, while those correctly identified may regain full physical function on levodopa. The condition is extremely rare, affecting roughly one in two million people and appearing more often in females, and it stems from mutations in the GTP cyclohydrolase 1 gene or the tyrosine hydroxylase gene that reduce dopamine production in the basal ganglia. A hallmark clue is diurnal variation, with symptoms nearly absent after sleep and worsening through the day. Written by a researcher and editor with graduate qualifications and hands-on caregiving experience, this material offers a clear, well-organized reference that helps families, seniors, and people living with disabilities recognize the signs, understand the diagnostic path through levodopa trials and cerebrospinal fluid testing, and appreciate why an accurate diagnosis can change the course of a person's life.*

At a Glance

• 1 - DRD is more common in females than in males. Estimated European prevalence ranges from one in a million to one in 200,000.
• 2 - About 40 percent of people with DRD carry no mutation in the GTP-CH1 or hTH genes. This makes a detailed family history an essential part of reaching a diagnosis.
• 3 - Levodopa has restored function even in people symptomatic for as long as fifty years before treatment began. Possible side effects include nausea, fatigue, constipation, and light-headedness.
• 4 - Patients must stop taking levodopa at least a week before cerebrospinal fluid is collected by lumbar puncture. Depression can appear as a byproduct of dystonia, and treating it may improve movement symptoms rather than reflecting on the person.

Topic Definition

Dopa-Responsive Dystonia

Dopa-responsive dystonia is a hereditary neurological movement disorder in which reduced dopamine production in the basal ganglia leads to muscle stiffness, abnormal posture, and progressive trouble walking, usually beginning in early childhood. It results chiefly from mutations affecting the enzymes GTP cyclohydrolase or tyrosine hydroxylase, both needed to make dopamine, and it is named for its strong and often lasting response to levodopa, the medication that replenishes the missing neurotransmitter. The disorder is distinguished by a characteristic daily pattern in which symptoms are mild after sleep and grow heavier as the day goes on, a feature that helps separate it from similar conditions such as cerebral palsy and other early-onset dystonias.

Overview

What is Dopa-Responsive Dystonia?

Dopa-Responsive Dystonia or, 'DRD,' is a hereditary form of dystonia. It is characterized by progressive difficulty with walking. DRD symptoms might be similar to those of early-onset generalized dystonia. Dopamine-responsive dystonia, (Hereditary progressive dystonia with diurnal fluctuation, Segawa's disease, or Segawa's dystonia) - a genetic movement disorder which usually manifests itself during early childhood at around ages 5 to 8 years (variable start age). Symptoms include increased muscle tone (dystonia, such as clubfoot) and Parkinsonian features, typically absent in the morning or after rest but worsening during the day and with exertion. Children with DRD are often misdiagnosed as having cerebral palsy.

DRD Symptoms

DRD classically presents as a dystonic gait disorder in a person's early childhood. While symptoms commonly present around the age of seven, clinical observations in a number of families have made it evident that manifestations of DRD can appear at any age.

The most common complaint people with DRD have is difficulty with walking. Symptoms might seem to be minor, such as muscle cramps after exercise, or present later in a person's life in a form that more closely resembles Parkinson's disease. The features of parkinsonism that can occur include instability or lack of balance, slowness of movements, or hand tremors.

The symptoms of DRD are often worse later in the day and might increase with exertion. They are almost always better in the morning, after a person has slept.

DRD Causes

DRD is thought to be due to abnormal functioning of the basal ganglia, which are deep brain structures involved with the control of a person's movement. The basal ganglia assist with initiating and regulating movement. Exactly what goes wrong in a person's basal ganglia remains an unknown. An imbalance of dopamine, a neurotransmitter in the basal ganglia, might underlie several different forms of dystonia, yet more research needs to be conducted for an increased understanding of the brain mechanisms involved with dystonia.

Two genes responsible for DRD have been identified. One gene codes for the production of an enzyme called, 'GTP cyclohydrolase,' and another codes for an enzyme called, 'tyrosine hydroxylase.'

Both enzymes contribute to the production of dopamine. When these genes are affected so they are unable to fully accomplish the job of producing dopamine and the levels of dopamine in a person's body are reduced - people start to have issues with movement.

The most commonly identified form is termed,' dopa-responsive dystonia,' which is a dominantly inherited condition caused by mutations in the GTP cyclohydrolase 1 gene (GTP-CH1). Another common form of DRD is caused by a mutation in the recessively inherited tyrosine hydroxylase gene (hTH). Approximately 40% of people with DRD do not present a mutation in the GTP-CH1 or the hTH genes.

Other known inherited metabolic conditions may cause DRD, to include autosomal recessive deficiencies of GTP-CH1 and aromatic L-amino acid decarboxylase and additional defects of tetrahydrobiopterin metabolism. These recessively inherited conditions often times affect cognitive function, which is not associated with the dominantly inherited DRD. If; however, the symptoms of dominantly inherited DRD affect a person's speech - a cognitive issue might be presumed even though in reality the person's cognitive function is average.

Dr. Masaya Segawa from Japan first described this condition as, "hereditary progressive dystonia with marked diurnal variation." 'Dopa-Responsive Dystonia (DRD),' is the term used to describe the dystonias that respond to levodopa and is used widely in journals.

Diagnosing DRD

A diagnosis of DRD is not made by one single, definitive test. Instead, it is achieved by a series of clinical observations and specific biochemical assessments. Defining the exact etiology or cause might not be possible. A therapeutic trial with levodopa is still the most practical initial approach to achieving a diagnosis of DRD. Dystonia; however, that responds to levodopa might result from multiple conditions.

Not every person with DRD responds promptly to levodopa. Even an adverse reaction might help illuminate the etiology and prompt further testing. In addition, not all people who are carriers present with symptoms. A detailed family history is an important element of diagnosis.

Getting a cerebrospinal fluid sample through lumbar puncture is an important part of diagnosing DRD. It might be the easiest way to achieve a preliminary diagnosis and distinguish among the metabolic conditions mentioned. There is still a chance the cerebrospinal test will not provide a definitive diagnosis. It is critical that the person cease taking levodopa at least a week prior to the collection of cerebrospinal fluid. DRD also should be distinguished from other disorders with symptoms that are similar including:

• Cerebral palsy
• Spastic paraplegia
• Early-onset generalized dystonia
• Disorders that cause childhood-onset parkinsonism

A child diagnosed with early-onset generalized dystonia often times receives a trial prescription of levodopa to rule out DRD. A number of symptoms of DRD may mimic cerebral palsy (CP). Leg spasticity inhibiting a person's ability to walk happens in both disorders, yet DRD has several characteristics that set it apart from CP and other forms of neurological disorders. Most noticeable are the diurnal variation of symptoms and the hereditary aspects of DRD. CP usually results from a brain injury prior to or during birth and rarely runs in families. People and their family members should understand that diagnosing DRD can be challenging, yet these are steps toward differentiating among the various forms of dystonia that respond to lovodopa.

Treating DRD

Treatment for dystonia is designed to help decrease the symptoms of pain, spasms, as well as functions and disturbed postures. Most therapies are symptomatic, trying to cover up or release the dystonic spasms. No one strategy will be appropriate for every person.

The symptoms of DRD can usually be treated effectively with levodopa. In many instances, full physical functionality is restored. Levodopa responsiveness has been reported to be effective in those who have been symptomatic as long as fifty years before treatment. Stable response after years of continuous treatments has been reported as well. Side-effects of the medication might include:

• Nausea
• Fatigue
• Constipation
• Light-headedness

Support for People with DRD

Dystonia and its emotional offshoots affect every aspect of a person's life. It affects how the person thinks, acts, as well as how they cope. By educating yourself with information, you have taken the first step towards dealing with dystonia. Stress is an inevitable part of human life and while it plainly does not cause dystonia it may aggravate dystonia symptoms. Stress-reduction programs such as meditation, relaxation techniques, or writing in a journal can be helpful.

At times, depression can be a, 'byproduct,' of dystonia. Depression can aggravate symptoms and make them worse, but often times - treating depression may result in an improvement of dystonia. It is important to remember that depression is a disorder, it is treatable and is not a reflection of the person.

Many people are experiencing similar symptoms. Reassurance from family members, friends, or others who have dystonia is helpful. Sharing experiences at support group meetings offers camaraderie, encouragement and the latest information regarding new treatments and medical advances.

Dopa-Responsive Dystonia Facts

• Due to commonly being misdiagnosed, it is common for the disease to remain untreated. When left untreated, patients often need achilles tendon surgery by the age of 21
• DRD must be distinguished from other disorders with similar symptoms including cerebral palsy, early-onset generalized dystonia, spastic paraplegia, and disorders which cause childhood-onset parkinsonism.
• DRD can be inherited in an autosomal dominant or autosomal recessive manner, depending on the subtype. It can also occur due to de novo mutations.
• Many patients experience improvements with sleep and are relatively free of symptoms in the morning, developing increasingly severe symptoms as the day progresses.
• As this form of dystonia may be genetic, some people find it helpful to speak to a genetic counselor regarding the genetic issues and what this may mean for you and your family.
• This condition is very rare, only affecting one in two million people. It is more common in females that in males. There are several hundred cases in the United States, 25 known cases in the United Kingdom, and less than that in Australia and New Zealand.
• The estimated European prevalence of DRD ranges from 1/1,000,000-1/200,000.

Frequently Asked Questions

NOTE: Researched FAQs by Disabled World (DW)

Is dopa-responsive dystonia the same as Parkinsons disease

No, they are separate conditions, though DRD can produce parkinsonian features such as tremor, slowness, and balance problems, which is one reason it can be mistaken for early Parkinsons in some patients.

Can dopa-responsive dystonia be cured

There is no cure, but symptoms can often be controlled so well with levodopa that many people regain full or near-full physical function for years at a time.

At what age do symptoms usually begin

Symptoms most often appear in early childhood around age seven, although onset can occur at almost any age depending on the individual and family.

Is genetic testing available for families

Testing can identify mutations in the GTP-CH1 and tyrosine hydroxylase genes, and speaking with a genetic counselor can help families understand inheritance patterns and risk.

How is dopa-responsive dystonia inherited

It can pass down in an autosomal dominant or autosomal recessive pattern depending on the subtype, and it can also arise from new de novo mutations with no family history.

Why is dopa-responsive dystonia so often misdiagnosed

Its leg spasticity and walking difficulty closely resemble cerebral palsy, so without attention to the daily symptom rhythm and family history it is easy to confuse the two.

Does stress make dopa-responsive dystonia worse

Stress does not cause the disorder but may aggravate symptoms, so relaxation techniques, meditation, and journaling are sometimes recommended as supportive measures.

How rare is dopa-responsive dystonia

It is very rare, affecting roughly one in two million people, with only several hundred known cases in the United States and far fewer elsewhere.

Insights, Analysis, and Developments

Editorial Note: What sets dopa-responsive dystonia apart from the conditions it resembles is how dramatically it can respond to the right medication, a rarity among movement disorders where most therapies only mask symptoms. The recessively inherited metabolic forms can affect cognition, yet the dominantly inherited variety leaves cognitive function intact, even when speech difficulties create a misleading impression otherwise. Dr. Masaya Segawa of Japan first described the disorder as hereditary progressive dystonia with marked diurnal variation, and that daily rhythm of symptoms, worse with exertion and eased by rest, remains one of the clearest signals clinicians rely on to tell DRD apart from cerebral palsy and early-onset generalized dystonia. For families weighing what a genetic diagnosis means across generations, speaking with a genetic counselor is often a practical next step, and support groups can supply both camaraderie and current news on emerging treatments.*

Author Credentials: Thomas C. Weiss is a researcher and editor for Disabled World. Thomas attended college and university courses earning a Masters, Bachelors and two Associate degrees, as well as pursing Disability Studies. As a CNA Thomas has providing care for people with all forms of disabilities. Explore Thomas' complete biography for comprehensive insights into his background, expertise, and accomplishments.

* Editorial additions by Ian C. Langtree.