Analysis of C9orf72 repeat expansions in a large international cohort of dementia with Lewy bodies.
Kun-Rodrigues C., Ross OA., Orme T., Shepherd C., Parkkinen L., Darwent L., Hernandez D., Ansorge O., Clark LN., Honig LS., Marder K., Lemstra A., Scheltens P., van der Flier W., Louwersheimer E., Holstege H., Rogaeva E., St George-Hyslop P., Londos E., Zetterberg H., Barber I., Braae A., Brown K., Morgan K., Maetzler W., Berg D., Troakes C., Al-Sarraj S., Lashley T., Holton J., Compta Y., Van Deerlin V., Trojanowski JQ., Serrano GE., Beach TG., Clarimon J., Lleó A., Morenas-Rodríguez E., Lesage S., Galasko D., Masliah E., Santana I., Diez M., Pastor P., Tienari PJ., Myllykangas L., Oinas M., Revesz T., Lees A., Boeve BF., Petersen RC., Ferman TJ., Escott-Price V., Graff-Radford N., Cairns NJ., Morris JC., Stone DJ., Pickering-Brown S., Mann D., Dickson DW., Halliday GM., Singleton A., Guerreiro R., Bras J.
C9orf72 repeat expansions are a common cause of amyotrophic lateral sclerosis and frontotemporal dementia. To date, no large-scale study of dementia with Lewy bodies (DLB) has been undertaken to assess the role of C9orf72 repeat expansions in the disease. Here, we investigated the prevalence of C9orf72 repeat expansions in a large cohort of DLB cases and identified no pathogenic repeat expansions in neuropathologically or clinically defined cases, showing that C9orf72 repeat expansions are not causally associated with DLB.