Pathogenic huntingtin repeat expansions in patients with frontotemporal dementia and amyotrophic lateral sclerosis

We examined the role of repeat expansions in the pathogenesis of frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS) by analyzing whole-genome sequence data from 2,442 FTD/ALS patients, 2,599 Lewy body dementia (LBD) patients, and 3,158 neurologically healthy subjects. Pathogenic e...

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Detalhes bibliográficos
Autores: Dewan, Ramita, Chia, Ruth, Ding, Jinhui, Hickman, Richard A., Stein, Thor D., Abramzon, Yevgeniya, Ahmed, Sarah, Sabir, Marya S., Portley, Makayla K., Tucci, Arianna, Ibañez, Kristina, Shankaracharya, F.N.U., Keagle, Pamela, Rossi, Giacomina, Caroppo, Paola, Tagliavini, Fabrizio, Waldo, Maria L., Johansson, Per M., Nilsson, Christer F., Infante Ceberio, Jon|||0000-0003-4025-4606
Formato: artículo
Fecha de publicación:2021
País:España
Recursos:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/24038
Acesso em linha:http://hdl.handle.net/10902/24038
Access Level:acceso abierto
Palavra-chave:Amyotrophic lateral sclerosis
Frontotemporal dementia
Lewy body dementia
Huntington’s disease
Whole-genome sequencing
Huntingtin
Repeat expansions
Descrição
Resumo:We examined the role of repeat expansions in the pathogenesis of frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS) by analyzing whole-genome sequence data from 2,442 FTD/ALS patients, 2,599 Lewy body dementia (LBD) patients, and 3,158 neurologically healthy subjects. Pathogenic expansions (range: 40 to 64 CAG repeats) in the huntingtin (HTT) gene were found in three (0.12%) patients diagnosed with pure FTD/ALS syndromes, but were not present in the LBD or healthy cohorts. We replicated our findings in an independent collection of 3,674 FTD/ALS patients. Postmortem evaluations of two patients revealed the classical TDP-43 pathology of FTD/ALS, as well as huntingtin-positive, ubiquitin-positive aggregates in the frontal cortex. The neostriatal atrophy that pathologically defines Huntington?s disease was absent in both cases. Our findings reveal an etiological relationship between HTT repeat expansions and FTD/ALS syndromes, and indicate that genetic screening of FTD/ALS patients for HTT repeat expansions should be considered.

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