Gerstmann-Sträussler-Scheinker syndrome (GSSS) is an autosomal dominant inherited, very rare type of human spongiform encephalopathy. As in the familial form of Creutzfeldt-Jacob disease, pathogenic variants in the gene encoding the prion protein (PRNP) are causative for the disease. To date, several variants have been described, of which Pro102Leu is the most common. Initial manifestations of the disease usually occur between the 3rd and 5th decade of life. The main clinical symptoms are cerebellar dysfunction with cerebellar ataxia, dysarthria, nystagmus, gait ataxia and at later stages development of dementia. The neurological symptoms are a result of the accumulation of amyloid plaques in the brain, particularly in the cerebellum region. The average survival rate after diagnosis is about 5 years.
Mercer et al. 2018, PLOS Pathogens 14:e1006826 / Pirisinu et al. 2016 Sci Rep 6:20443 / Cagnoli et al. 2008, Mov Disord 23:1468 / De Michele et al. 2003, Can J Neurol Sci 30:233 / Parchi et al. 1998, Proc Natl Acad Sci 95:8322 / Young et al. 1997, Brain Res Mol Brain Res 44:147 / Hsiao et al. 1992, Nat Genet 1:68