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

Aicardi-Goutières syndrome

Aicardi-Goutières syndrome is a rare, inflammatory disorder that primarily affects the brain, immune system, and skin, often mimicking a congenital viral infection.

Overview

Aicardi-Goutières syndrome is divided into early-onset (classic) and later-onset forms. It is characterized by severe neurological dysfunction, immune system activation, and skin lesions. Because it triggers an inflammatory response similar to a viral infection without an actual infection present, it is often called a "mimic of congenital infection."

Symptoms

  • Neurological: Severe brain dysfunction (encephalopathy), developmental regression, seizures, loss of white matter (leukodystrophy), brain calcification, and microcephaly (abnormally small head).
  • Physical: Muscle stiffness (spasticity), involuntary muscle tensing (dystonia), and weak muscle tone (hypotonia).
  • Systemic: Irritability, poor feeding, intermittent fevers (sterile pyrexias), and potential enlargement of the liver and spleen.
  • Skin: Chilblains—painful, itchy, red, and puffy lesions on the fingers, toes, nose, and ears, often worsened by cold.

Causes

The syndrome is caused by variants in several genes (including TREX1, RNASEH2A/B/C, SAMHD1, IFIH1, ADAR, RNU7-1, and LSM11). These genes are responsible for breaking down unneeded DNA and RNA or regulating immune responses. When these genes malfunction, cells accumulate DNA/RNA fragments that the body mistakes for viral invaders. This triggers an abnormal activation of interferon proteins, leading to inflammation and damage to the brain and other tissues. Consequently, the condition is classified as an interferonopathy.

Inheritance

Most cases are inherited in an autosomal recessive pattern, requiring two mutated gene copies. However, when caused by variants in the IFIH1 gene or specific variants in TREX1 or ADAR, the condition is inherited in an autosomal dominant pattern, where one copy of the altered gene is sufficient to cause the disorder.

Frequently Asked Questions

Severe seizures that do not respond to first‑line antiepileptic drugs, sudden worsening of breathing or oxygen saturation, high fever with no clear source, and signs of increased intracranial pressure (such as bulging fontanelle, vomiting, or altered consciousness) are all red flags. In these situations, the child should be taken to the emergency department for rapid evaluation, seizure control, and possible imaging or lumbar puncture to rule out infection or other complications.
clinician will look for a combination of neurological and systemic findings that appear within the first weeks of life. These include a markedly small head size (microcephaly), poor feeding or failure to thrive, irritability with intermittent fevers that are not linked to a bacterial infection, and skin lesions such as painful, itchy red bumps on the fingers or toes (chilblain‑like lesions). If a newborn also shows abnormal brain imaging—such as calcifications in the basal ganglia or white‑matter loss—these findings together raise suspicion for Aicardi‑Goutières syndrome and prompt genetic testing.
While there is no cure, supportive care can improve quality of life. A high‑calorie, nutrient‑dense diet helps counter growth failure; a diet low in simple sugars may reduce inflammatory triggers. Regular physiotherapy and occupational therapy can maintain muscle tone and improve motor skills. Some families find benefit from anti‑inflammatory medications (e.g., corticosteroids or interferon‑blocking agents) under specialist guidance, but these require close monitoring for side effects.
Most cases are autosomal recessive, meaning both parents carry one mutated allele. Couples with an affected child have a 25 % chance of having another affected child with each pregnancy. If the mutation is in a gene that can be inherited dominantly (e.g., IFIH1), the risk is higher. Genetic counseling can provide carrier testing for both parents, discuss prenatal testing (chorionic villus sampling or amniocentesis) or pre‑implantation genetic diagnosis if the couple wishes to avoid affected pregnancies.
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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