Background: Gordon Holmes syndrome (GHS), characterized by cerebellar ataxia and hypogonadotropic hypogonadism (HH), has been related to recessive mutations in PNPLA6 gene. Aims of the study: Describe one Portuguese family with GHS due to compound heterozygosity of two new PNPLA6 variants. Methods: Report on the clinical presentation, diagnostic and genetic workup to reach GHS diagnosis. Results: The index case...