Aromatic L-amino Acid Decarboxylase (AADC) Deficiency

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 17 min read
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Aromatic l-amino acid decarboxylase (AADC) deficiency is a very rare genetic autosomal recessive neurometabolic disorder that leads to a severe combined deficiency of serotonin, dopamine, norepinephrine, and epinephrine and decreased activity of aromatic l-amino acid decarboxylase, an enzyme involved in the building (synthesis) of neurotransmitters (dopamine and serotonin), which are responsible for the communication between neurons in the nervous system. Although affected individuals can appear...

Key Takeaways

  • This article explains Causes in simple medical language.
  • This article explains Symptoms in simple medical language.
  • This article explains Diagnosis in simple medical language.
  • This article explains Treatment  in simple medical language.
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Definition

Aromatic l-amino acid decarboxylase (AADC) deficiency is a very rare autosomal recessive neurometabolic disorder that leads to a combined deficiency of serotonin, dopamine, norepinephrine, and epinephrine and decreased activity of aromatic l-amino acid decarboxylase, an enzyme involved in the building (synthesis) of neurotransmitters (dopamine and serotonin), which are responsible for the communication between neurons in the nervous system. Although affected individuals can appear normal at birth, most will develop symptoms during the first months of life. AADC deficiency most commonly leads to decreased muscle tone (hypotonia), movement disorders including abnormal eyes movement (oculogyric crises), developmental delay, restricted growth (), and disruption of the part of the nervous system responsible for unconscious modulation of body functions such as heartbeat (autonomic nervous system). Medication is available to manage the symptoms, but the response to treatment greatly varies among affected individuals, and an optimal treatment regimen can be difficult to achieve. There is currently no cure for the disease, but gene therapy has shown potential to improve symptoms in trials.

Levels of evidence according to SIGN

Levels of evidence
1++ High-quality meta-analyses, systematic reviews of RCTs or RCTs with a very low risk of bias
1+ Well-conducted meta-analyses, systematic reviews, or RCTs with a low risk of bias
1- Meta-analyses, systematic reviews, or RCTs with a high risk of bias
2++ High-quality systematic reviews of case-control or cohort studies
High-quality case-control or cohort studies with a very low risk of confounding or bias and a high probability that the relationship is causal
2+ Well-conducted case-control or cohort studies with a low risk of confounding bias and a probability that the relationship is causal
2- Case-control or cohort studies with a high risk of confounding or bias and a significant risk that the relationship is not causal
3 Non-analytic studies, e.g. case reports, case series
4 Expert opinion

Causes

AADC deficiency is caused by mutations (changes) in a gene called DDC (which stands for DOPA decarboxylase, another name for AADC). An abnormal DDC gene leads to the production of a dysfunctional AADC enzyme that cannot accomplish its normal functions. Enzymes are a type of protein widely present in the body and their role is to facilitate and accelerate (catalyze) chemical reactions that have to take place for the body to function correctly. AADC catalyzes chemical reactions responsible for the formation (synthesis) of molecules called neurotransmitters that are essential for proper communication between neurons of the nervous system. The neurotransmitters affected by AADC deficiency are epinephrine and norepinephrine (products of dopamine and involved in the control of the sympathetic nervous system, the “fight or flight” branch of the autonomic nervous system), dopamine (involved in motor control, reward, and motivation), and serotonin (involved in sleep, memory, appetite, and mood). Serotonin is also required for the synthesis of melatonin, which is primarily involved in the regulation of the sleep-wake cycle. The deficiency of those neurotransmitters is responsible for the manifestations of AADC deficiency.

AADC deficiency is an autosomal recessive genetic disorder. This type of genetic disorder occurs when an individual inherits an abnormal gene from each parent. If an individual receives one normal gene and one abnormal gene for the disease, the person will be a carrier of the disease, but usually will not show symptoms. The risk for two carrier parents to both pass the abnormal gene and, therefore, have an affected child is 25% with each pregnancy. The risk to have a child who is a carrier, like the parents, is 50% with each pregnancy. The chance for a child to receive normal genes from both parents is 25%. The risk is the same for males and females.

Mutations in the DDC gene cause AADC deficiency. The DDC gene provides instructions for making the AADC enzyme, which is important in the nervous system. This enzyme helps produce dopamine and serotonin from other molecules. Dopamine and serotonin are neurotransmitters, which are chemical messengers that transmit signals between nerve cells, both in the brain and (central nervous system) and in other parts of the body (peripheral nervous system).

Mutations in the DDC gene result in reduced activity of the AADC enzyme. Without enough of this enzyme, nerve cells produce less dopamine and serotonin. Dopamine and serotonin are necessary for normal nervous system function, and changes in the levels of these neurotransmitters contribute to the developmental delay, intellectual , abnormal movements, and autonomic dysfunction seen in people with AADC deficiency.

AADC deficiency is a very rare and complex disease with features that overlap with many other disorders (see above). A complete clinical evaluation and a high index of suspicion are required to make the diagnosis. The evaluation of a child with neurodevelopmental delay starts with a perinatal and developmental history and a complete physical examination. Although many tests, such as a , measurement of electrolyte levels, and of the brain are usually performed in the diagnostic workup of a child presenting with neurodevelopmental delay, the laboratory diagnosis of AADC deficiency is centered about four specific tests:

  • 1) A lumbar puncture is a procedure where a needle is placed in the spinal column of the patient to collect cerebrospinal fluid (CSF). The CSF is then analyzed to identify abnormal levels of certain substances (metabolites) involved in the molecular pathways of neurotransmitter synthesis. The synthesis of neurotransmitters involves a cascade of numerous chemical reactions. In patients with AADC deficiency, the cascade stops where AADC is usually required to catalyze the chemical reactions. As a result, in cases of enzyme deficiency, the metabolites “before” AADC in the chemical reaction cascade will be increased, and those “after” will be decreased.
  • 2) Measurement of a specific metabolite 3-O-methyl-dopa (3OMD) in plasma or dried blood spots, which will be increased in patients with the disease.
  • 3) Measurement of the activity level of the AADC enzyme in the blood (serum), which will be reduced in patients with the disease.
  • 4) Genetic testing that can identify disease-causing (pathogenic) mutations in the DDC gene.

Treatment 

Although there is currently no cure for AADC deficiency, numerous medications can help manage the symptoms. The optimal medication regimen greatly varies among affected individuals. There is limited scientific evidence for the efficacy of most treatment options due to the rarity of the disease. Each patient needs to have a personalized approach and should be followed by a pediatric neurologist and potentially many other physicians to assist in trials of medications to determine the best combination on a case-by-case basis. Some of the most commonly used treatments include medications to increase the concentration of dopamine in the nervous system (dopamine agonists) or to decrease its degradation (monoamine oxidase B [MAO-B] inhibitors). Vitamin B6 (pyridoxine) or its active form, pyridoxal phosphate (PLP), are often tried, as PLP normally assists AADC in its role as a cofactor and might therefore increase the residual activity of the enzyme. Other medications might be considered depending on the patient. For example, melatonin can be tried for sleep disturbances, and benzodiazepines (a class of medication that acts as central nervous system depressants), or anticholinergics (which counteract the activity of acetylcholine, a neurotransmitter) might help patients with oculogyric crises and other motor symptoms.

A key factor for the optimal management of AADC deficiency is to adopt a multidisciplinary approach to address the specific needs of the affected individual. Members of the team commonly include physiotherapists, speech therapists, dieticians, psychologists, social workers, and physiatrists (physicians specializing in rehabilitation).

Individuals will require physiotherapy, occupational therapy, and speech and language therapy. Some will need enteral feeding (for example, a gastrostomy or jejunostomy) due to difficulties with chewing and swallowing.

Various medications can help compensate for the missing neurotransmitters. Dopamine agonists such as rotigotine or pramipexole and monoamine oxidase inhibitors such as selegiline are commonly used. Individuals may also need to take a range of other medications to control dyskinesia, constipation, and other symptoms.[rx]

In July 2021, results of a small gene therapy phase I study reported observation of dopamine restoration on seven participants between 4 and 9 years old. As of May 2022, the gene therapy product eladocagene exuparvovec is recommended for approval by the European Commission.

Recommended drugs and doses for AADC deficiency

Class Drug Mechanism Dose recommendation Precaution/comments
FIRST-LINE TREATMENT AGENTS Vitamin B6 Pyridoxine (Vit B6) The cofactor, optimizes residual AADC activity Start: 100 mg/d in 2 doses
Max 200 mg/d		 It May be preferred over pyridoxal 5-phosphate because of cost and availability
Maintain for 1 year, then discontinue when in stable circumstances. If no deterioration, leave discontinued.
Chronic use in high doses can cause severe sensorimotor polyneuropathy
Side effects: generally well tolerated, sometimes nausea, vomiting.
Pyridoxal 5-Phosphate The cofactor, optimizes residual AADC activity Start:100 mg/d in 2 doses.
Max 200 mg/d		 Consider a trial of pyridoxine gives too many side effects or is not effective.
Chronic use in high doses can cause severe sensorimotor polyneuropathy
Dopamine agonists Pramipexole Non-ergot derived D2-agonist with a preference for D3 receptor subtype. Start 0.005 – 0.010 mg/kg/d of BASE in 1-3 divided doses, increase every 3-7* days by 0.005 mg/kg/d, max 0.075 mg/kg or 3.3 mg/d of BASE The distinction in salt and base content.
Take tablets with water, optional with food
High risk of drug-induced dyskinesias
Ropinirole Non-ergot derived D2-agonist with a preference for D3-receptor subtype. Suggestion: Start 0.25 mg/d
1 daily 2 h before bedtime; increase every 3-7* days to 0.5-4.0 mg/d in 3 divided doses, max 0.3 mg/kg/d or 24 mg/d		 Do not use in severe kidney failure
Take tablets with food
With very limited experience in AADC deficiency, physicians should extrapolate and titrate carefully. Probably high risk of drug-induced dyskinesias as in other dopamine agonists.
Rotigotine patch Non-ergot-derived D2 agonist with a preference for D3; also effect on D2, D1, and D5; and α2B and 5HT1A agonist. >12 years and >15 kg:
Start 2 mg/d; weekly increase by 2 mg, max 8 mg/d.		 No data available for use in children <12y/ <15 kg.
Do not cut patches.
Drug-induced dyskinesias require a lower dose and/ or slower increase
Skin reactions occur often (about 30 %).
Sulfite can lead to allergic reactions
Remove patch during MRI/ electro cardioversion (aluminum content)
Bromocriptine Ergot-derived D2-agonist with D1 receptor antagonist effect Start 0.1 mg/kg/d (max 1.25 mg/d); increase weekly by 0.1 mg/kg/d (max 1.25 mg/d) up to 0.5 mg/kg/d (max 30 mg/d) in 2-3 divided doses. Non-ergot-derived dopamine agonists are preferred
Take tablets with food
Small risk of fibrotic complications, consider cardiac screening before and during use.
Higher risk with a higher dose, dose restricted to 30 mg/d in adults. Maintain the lowest effective dose.
Pergolide or cabergoline Ergot-derived None Do not use it because of the higher risk of fibrotic complications
MAO-inhibitors Selegiline MAO-B inhibitor (non-selective in very high doses) Start 0.1 mg/kg/d in 2-3 divided doses. Increase every 2 weeks by 0.1 mg/kg/d up to 0.3 mg/kg/d or 10 mg/d Dose at breakfast and lunch, avoid night-time doses if insomnia is experienced.
Does sublingual preparations much lower
Tranylcypromine Non-selective MAO-A and -B inhibitor Start 0.1 mg/kg/d in 2 doses. Increase every 2 weeks by 0.1 mg/kg/d up to 0.5 mg/kg/d (max 30 mg) Dose at breakfast and lunch, and avoid night-time doses if insomnia is experienced.
The occurrence of the ‘cheese effect’ (hypertensive crises when foods with high content of tyramine are ingested) is very unlikely in patients with AADC deficiency due to their low levels of dopamine, norepinephrine, and epinephrine.
ADDITIONAL SYMPTOMATIC TREATMENT Anticholinergics
(dystonia/ autonomic symptoms)		 Trihexyphenidyl Anticholinergic agents, restores neurotransmitter disbalance <15 kg: start 0.5-1 mg/d in 1 dose; increase every 3-7* days by 1 mg/d in 2-4 doses/d
>15 kg: start 2 mg/d in 2 doses; increase every 3-7* days by2mg/d in 2-4 divided doses.
Effective dose highly variable (6-60 mg)
Maximum dose: <10 kg 30 mg/d; >10 kg 60 mg/d		 In general, the younger, the better tolerated; dosages often exceed recommended dose for adults (15 mg/d).
The maximum dose is dictated by side effects: e.g. dry mouth, dry eyes, blurred vision (mydriasis), urine retention, constipation. Sedation in high doses.
Benztropine Centrally acting anticholinergic agent. Also dopaminergic effect by inhibiting presynaptic reuptake Start 1 mg in 2 divided doses, increase weekly up to 4 mg/d Anticholinergic side effects: e.g. dry mouth, dry eyes, blurred vision (mydriasis), urine retention, obstipation. Sedation in high doses.
Nasal congestion Oxymetazoline or xylometazoline nosedrops α-adrenergic agonist leading to local vasoconstriction Use general dose guidelines for age, try to use the lowest available dose in chronic use Try to include intermittent weeks without treatment to prevent habituation
Hypertensive crises if used concomitantly with MAO-inhibitors are very unlikely in patients with AADC deficiency due to their levels of dopamine, norepinephrine, and epinephrine
Sleeping problems Melatonin Regulates onset of sleep and day/night cycling Start 3 mg/d, given 4 h before the onset of sleep. Max dose 5-8 mg/d Transient night terrors on initial treatment can occur (personal experience)
Availability differs between countries.
Irritability/ sleep disturbance Clonidine Centrally acting antihypertensive drug; imidazoline (I1-) and α2-agonist Start 0.1 mg/d ante Noctum, increase to max 3 mg/d ante Noctum Monitor blood pressure in a higher dose
Sedative, therefore gives AN
SPECIAL CASES ONLY L-Dopa binding site variant L-Dopa without carbidopa Substrate for AADC to form dopamine; effective in certain binding site variants Start 0.5-1 mg/kg/d in 3 divided doses, increase 2 weekly by 1 mg/kg to 5 mg/kg/d. Only if clinical effective, further increase to max 15 mg/kg/d Start as a first-line treatment only if known binding site variant.
Otherwise, consider a third-line treatment trial for 2 months (or less if deterioration) when in a stable clinical situation.
Monitor CSF during treatment, including 5-MTHF
Low 5-MTHF in CSF Folinic acid (calcium folinate) Methylation of excessive amounts of L-Dopa in AADCD may cause depletion of methyl donors. 1-2 mg/kg/d, max 20 mg/ d Only supply if 5-MTHF is low in CSF
Monitor 5-MTHF in CSF during treatment with L-Dopa

Investigational Therapies

Current research and clinical trials in AADC deficiency are mostly focused on gene therapy, which aims to replace the non-working gene. This is performed using a virus as a vector. Viruses can insert part of their genetic material into human cells and use the human cellular machinery to replicate. If the virus is genetically engineered so that the genetic material it inserts in human cells contains the functional DDC gene, a more functional AADC enzyme could be produced. Researchers have developed such viruses and injected them into specific regions of the brain of children with AADC deficiency. The results have been promising and many patients improved, but additional research is needed before this therapy is approved for clinical use.

References

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What to tell the doctor

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Safe first steps

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  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
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Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Orthopedic / spine specialist, physical medicine doctor, or qualified clinician
Tests to discuss with doctor
  • Neurological examination for leg power, sensation, reflexes, and straight leg raise
  • X-ray only if injury, deformity, long-lasting pain, or doctor suspects bone problem
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Questions to ask
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Care roadmap for: Aromatic L-amino Acid Decarboxylase (AADC) Deficiency

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Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
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Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

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