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

Perry Syndrome

Perry syndrome is a rare, life-threatening neurological condition characterized by a severe combination of parkinsonism, psychiatric changes, unexplained weight loss, and hypoventilation.

Overview

Perry syndrome is a progressive brain disease characterized by four core features: movement disorders (parkinsonism), psychological changes, marked weight loss, and abnormally shallow breathing (hypoventilation). The signs and symptoms typically emerge when an individual is in their forties or fifties.

Symptoms

Movement abnormalities and psychiatric symptoms generally appear first, followed later by respiratory complications:

  • Parkinsonism: Motor impairments including tremors, muscle stiffness, and abnormally slow movement (bradykinesia).
  • Psychiatric Symptoms: Behavioral and personality shifts, prominent depression, apathy (loss of enthusiasm and interest), withdrawal from family and friends, and suicidal thoughts.
  • Weight Loss: Severe, unexplained weight loss occurring early in the progression of the disease.
  • Hypoventilation: Abnormally slow or shallow breathing, occurring predominantly during sleep. This causes frequent nighttime awakenings and progressively worsens, resulting in a dangerous lack of oxygen and respiratory failure.

Prognosis & Frequency

Perry syndrome is extremely rare, with approximately 50 affected individuals documented worldwide. The disorder progresses rapidly; affected individuals generally survive for about 5 years after the onset of symptoms. The most common causes of death are respiratory failure, pneumonia, or suicide.

Causes & Genetics

Perry syndrome is caused by mutations in the DCTN1 gene. This gene encodes dynactin-1, a structural protein that interacts with cellular tracks called microtubules to move essential substances within cells, operating much like a cellular conveyor belt.

Mutations alter the physical structure of dynactin-1, impairing its ability to bind properly to microtubules. This transport failure disrupts cellular maintenance, causing nerve cells (neurons) to malfunction and die. The progressive death of neurons within brain regions governing movement, emotion, and respiration directly produces the clinical symptoms of Perry syndrome.

Inheritance

Perry syndrome follows an autosomal dominant pattern of inheritance:

  • A mutation in a single copy of the DCTN1 gene in each cell is sufficient to cause the disorder.
  • Most individuals inherit the variant from an affected parent.
  • Some cases occur due to new (de novo) mutations in individuals with no prior family history of the disease.

Other Names for This Condition

  • Parkinsonism with alveolar hypoventilation and mental depression

Frequently Asked Questions

Severe depression, emotional withdrawal, and apathy are core biological features of the disease rather than mere emotional reactions to diagnosis. Patients carry an exceptionally high risk of suicide, which often occurs early in the disease course. Clinicians and caregivers must implement continuous suicide risk assessments, initiate aggressive antidepressant and psychiatric care, and maintain close supervision to safeguard the patient.
Perry syndrome is inherited in an autosomal dominant manner, meaning an affected individual has a 50 percent chance of passing the altered DCTN1 gene to each biological child regardless of sex. First-degree relatives should receive genetic counseling to discuss predictive testing, family planning options, and early clinical screening.
Patients need early and routine respiratory evaluations, including baseline pulmonary function tests, nocturnal polysomnography (sleep studies), and regular blood gas monitoring to detect nocturnal hypoventilation and hypercapnia before daytime symptoms appear. Because respiratory failure can develop precipitously, prompt initiation of non-invasive positive pressure ventilation (such as BiPAP) during sleep is essential, and advanced directives regarding tracheostomy and invasive mechanical ventilation should be discussed early.
While both conditions feature parkinsonian signs such as tremor, rigidity, and bradykinesia, Perry syndrome typically presents with prominent early psychiatric changes (severe apathy and depression), unexplained rapid weight loss, and hypoventilation, particularly during sleep. Unlike classic Parkinson's disease, motor symptoms in Perry syndrome often show a poor or short-lived response to levodopa therapy, the disease progresses much more rapidly, and it follows an autosomal dominant inheritance pattern caused by DCTN1 mutations.
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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