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Role of the repeat expansion size in predicting age of onset and severity in RFC1 disease

Lookup NU author(s): Dr James Miller

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© The Author(s) 2024. Published by Oxford University Press on behalf of the Guarantors of Brain. RFC1 disease, caused by biallelic repeat expansion in RFC1, is clinically heterogeneous in terms of age of onset, disease progression and phenotype. We investigated the role of the repeat size in influencing clinical variables in RFC1 disease. We also assessed the presence and role of meiotic and somatic instability of the repeat. In this study, we identified 553 patients carrying biallelic RFC1 expansions and measured the repeat expansion size in 392 cases. Pearson's coefficient was calculated to assess the correlation between the repeat size and age at disease onset. A Cox model with robust cluster standard errors was adopted to describe the effect of repeat size on age at disease onset, on age at onset of each individual symptoms, and on disease progression. A quasi-Poisson regression model was used to analyse the relationship between phenotype and repeat size. We performed multivariate linear regression to assess the association of the repeat size with the degree of cerebellar atrophy. Meiotic stability was assessed by Southern blotting on first-degree relatives of 27 probands. Finally, somatic instability was investigated by optical genome mapping on cerebellar and frontal cortex and unaffected peripheral tissue from four post-mortem cases. A larger repeat size of both smaller and larger allele was associated with an earlier age at neurological onset [smaller allele hazard ratio (HR) = 2.06, P < 0.001; larger allele HR = 1.53, P < 0.001] and with a higher hazard of developing disabling symptoms, such as dysarthria or dysphagia (smaller allele HR = 3.40, P < 0.001; larger allele HR = 1.71, P = 0.002) or loss of independent walking (smaller allele HR = 2.78, P < 0.001; larger allele HR = 1.60; P < 0.001) earlier in disease course. Patients with more complex phenotypes carried larger expansions [smaller allele: complex neuropathy rate ratio (RR) = 1.30, P = 0.003; cerebellar ataxia, neuropathy and vestibular areflexia syndrome (CANVAS) RR = 1.34, P < 0.001; larger allele: complex neuropathy RR = 1.33, P = 0.008; CANVAS RR = 1.31, P = 0.009]. Furthermore, larger repeat expansions in the smaller allele were associated with more pronounced cerebellar vermis atrophy (lobules I-V β = -1.06, P < 0.001; lobules VI-VII β = -0.34, P = 0.005). The repeat did not show significant instability during vertical transmission and across different tissues and brain regions. RFC1 repeat size, particularly of the smaller allele, is one of the determinants of variability in RFC1 disease and represents a key prognostic factor to predict disease onset, phenotype and severity. Assessing the repeat size is warranted as part of the diagnostic test for RFC1 expansion.


Publication metadata

Author(s): Curro R, Dominik N, Facchini S, Vegezzi E, Sullivan R, Galassi Deforie V, Fernandez-Eulate G, Traschutz A, Rossi S, Garibaldi M, Kwarciany M, Taroni F, Brusco A, Good J-M, Cavalcanti F, Hammans S, Ravenscroft G, Roxburgh RH, Parolin Schnekenberg R, Rugginini B, Abati E, Manini A, Quartesan I, Ghia A, Lopez de Munain A, Manganelli F, Kennerson M, Santorelli FM, Infante J, Marques W, Jokela M, Murphy SM, Mandich P, Fabrizi GM, Briani C, Gosal D, Pareyson D, Ferrari A, Prados F, Yousry T, Khurana V, Kuo S-H, Miller J, Troakes C, Jaunmuktane Z, Giunti P, Hartmann A, Basak N, Synofzik M, Stojkovic T, Hadjivassiliou M, Reilly MM, Houlden H, Cortese A

Publication type: Article

Publication status: Published

Journal: Brain

Year: 2024

Volume: 147

Issue: 5

Pages: 1887-1898

Print publication date: 01/05/2024

Online publication date: 09/01/2024

Acceptance date: 10/12/2023

Date deposited: 20/05/2024

ISSN (print): 0006-8950

ISSN (electronic): 1460-2156

Publisher: Oxford University Press

URL: https://doi.org/10.1093/brain/awad436

DOI: 10.1093/brain/awad436

Data Access Statement: With publication, de-identified data collected for the study, including individual participant data and a data dictionary defining each field in the set, can be made available to interested parties on reasonable request, and if in line with privacy regulations. Data can be requested at least 18 months after publication of this manuscript by sending an e-mail to the corresponding author.

PubMed id: 38193360


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Funding

Funder referenceFunder name
1751723
2019-1836
F53D23002330006 - 20229MMHXP
Fondazione Cariplo
Fondazione Regionale per la Ricerca Biomedica (Regione Lombardia)
Inherited Neuropathy Consortium
MR/T001712/1
Medical Research Council
PRIN

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