Aicardi-Goutieres Syndrome 1

**Semantic type:** Disease or Syndrome

**Definition:** A heritable condition, caused by mutation(s) in the TREX1 gene, encoding three-prime repair exonuclease 1. Clinical features and onset may vary significantly, but is characterized in its most severe form by cerebral atrophy, leukodystrophy, intracranial calcifications, chronic cerebrospinal fluid (CSF) lymphocytosis, and increased concentrations of CSF alpha-interferon.

**Synonyms:** - AGS1 - Cree Encephalitis - Encephalopathy, Familial Infantile, with Intracranial Calcification and Chronic Cerebrospinal Fluid Lymphocytosis - Pseudotoxoplasmosis Syndrome