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Lookup NU author(s): Dr Neil Rajan
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Oxford University Press , 2020.
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© The Author(s) (2020). Published by Oxford University Press on behalf of the Guarantors of Brain. All rights reserved. For permissions, please email: firstname.lastname@example.org.Frontotemporal dementia and amyotrophic lateral sclerosis are clinically and pathologically overlapping disorders with shared genetic causes. We previously identified a disease locus on chromosome 16p12.1-q12.2 with genome-wide significant linkage in a large European Australian family with autosomal dominant inheritance of frontotemporal dementia and amyotrophic lateral sclerosis and no mutation in known amyotrophic lateral sclerosis or dementia genes. Here we demonstrate the segregation of a novel missense variant in CYLD (c.2155A>G, p.M719V) within the linkage region as the genetic cause of disease in this family. Immunohistochemical analysis of brain tissue from two CYLD p.M719V mutation carriers showed widespread glial CYLD immunoreactivity. Primary mouse neurons transfected with CYLDM719V exhibited increased cytoplasmic localization of TDP-43 and shortened axons. CYLD encodes a lysine 63 deubiquitinase and CYLD cutaneous syndrome, a skin tumour disorder, is caused by mutations that lead to reduced deubiquitinase activity. In contrast with CYLD cutaneous syndrome-causative mutations, CYLDM719V exhibited significantly increased lysine 63 deubiquitinase activity relative to the wild-type enzyme (paired Wilcoxon signed-rank test P = 0.005). Overexpression of CYLDM719V in HEK293 cells led to more potent inhibition of the cell signalling molecule NF-κB and impairment of autophagosome fusion to lysosomes, a key process in autophagy. Although CYLD mutations appear to be rare, CYLD's interaction with at least three other proteins encoded by frontotemporal dementia and/or amyotrophic lateral sclerosis genes (TBK1, OPTN and SQSTM1) suggests that it may play a central role in the pathogenesis of these disorders. Mutations in several frontotemporal dementia and amyotrophic lateral sclerosis genes, including TBK1, OPTN and SQSTM1, result in a loss of autophagy function. We show here that increased CYLD activity also reduces autophagy function, highlighting the importance of autophagy regulation in the pathogenesis of frontotemporal dementia and amyotrophic lateral sclerosis.
Author(s): Dobson-Stone C, Hallupp M, Shahheydari H, Ragagnin AMG, Chatterton Z, Carew-Jones F, Shepherd CE, Stefen H, Paric E, Fath T, Thompson EM, Blumbergs P, Short CL, Field CD, Panegyres PK, Hecker J, Nicholson G, Shaw AD, Fullerton JM, Luty AA, Schofield PR, Brooks WS, Rajan N, Bennett MF, Bahlo M, Landers JE, Piguet O, Hodges JR, Halliday GM, Topp SD, Smith BN, Shaw CE, McCann E, Fifita JA, Williams KL, Atkin JD, Blair IP, Kwok JB
Publication type: Article
Publication status: Published
Journal: Brain: A Journal of Neurology
Print publication date: 01/03/2020
Online publication date: 23/03/2020
Acceptance date: 17/12/2019
Date deposited: 26/04/2020
ISSN (print): 0006-8950
ISSN (electronic): 1460-2156
Publisher: Oxford University Press
PubMed id: 32185393
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