Aicardi-Goutières syndrome (AGS) is the prototypical cerebral interferonopathy and individuals with AGS have increased levels of the cytokine interferon (IFN)-α in the CSF (34–36), progressive encephalopathy with cerebral atrophy (35, 37), calcification in the basal ganglia and thalami (35, 37, 38), microangiopathy (38), diffuse white matter disease (35, 37, 38) and clinical signs such as irritability, ataxia, epileptic seizures and increased mortality (39). The gene discussed is IFNA1; the disease is Ataxia.