[Genetic background of corticobasal syndrome]

Corticobasal syndrome (CBS) is associated with different pathologies including FTLD-tau (corticobasal degeneration; CBD, progressive supranuclear palsy, and Pick disease), FTLD-TDP, Alzheimer disease, Creutzfeldt-Jakob disease, and Parkinson disease/dementia with Lewy bodies. Genetic causes of CBS are also various reflecting diverse pathology. In familial and sporadic FTLD, MAPT, GRN and C9ORF72 mutations are three major causes of the disease. A part of patients harboring these mutations could exhibit CBS. In addition, the patients with TARDBP, FUS, LRRK2 or CSF1R mutations also have potential to exhibit CBS. In sporadic cases, H1 haplotype of MAPT is known to be associated with FTLD-tau, including CBS/CBD. Despite major advances in recent years, the majority of familial and sporadic CBS cases are genetically unsolved. In particular, little is known about both familial and sporadic cases of CBS in Japanese. Further studies are needed to unveil the genetic background of CBS.