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Miyoshi myopathy and limb girdle muscular dystrophy R2 are the same disease

Lookup NU author(s): Dr Ursula Moore, Meredith James, Dr Anna Mayhew, Dr Michela Guglieri, Roberto Fernandez-Torron, Professor Andrew Blamire, Emerita Professor Katherine Bushby, Professor Volker Straub

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

© 2021 The AuthorsThis study aims to determine clinically relevant phenotypic differences between the two most common phenotypic classifications in dysferlinopathy, limb girdle muscular dystrophy R2 (LGMDR2) and Miyoshi myopathy (MMD1). LGMDR2 and MMD1 are reported to involve different muscles, with LGMDR2 showing predominant limb girdle weakness and MMD1 showing predominant distal lower limb weakness. We used heatmaps, regression analysis and principle component analysis of functional and Magnetic Resonance Imaging data to perform a cross-sectional review of the pattern of muscle involvement in 168 patients from the Jain Foundation's international Clinical Outcomes Study for Dysferlinopathy. We demonstrated that there is no clinically relevant difference in proximal vs distal involvement between diagnosis. There is a continuum of distal involvement at any given degree of proximal involvement and patients do not fall into discrete distally or proximally affected groups. There appeared to be geographical preference for a particular diagnosis, with MMD1 being more common in Japan and LGMDR2 in Europe and the USA. We conclude that the dysferlinopathies do not form two distinct phenotypic groups and therefore should not be split into separate cohorts of LGMDR2 and MM for the purposes of clinical management, enrolment in clinical trials or access to subsequent treatments.


Publication metadata

Author(s): Moore U, Gordish H, Diaz-Manera J, James MK, Mayhew AG, Guglieri M, Fernandez-Torron R, Rufibach LE, Feng J, Blamire AM, Carlier PG, Spuler S, Day JW, Jones KJ, Bharucha-Goebel DX, Salort-Campana E, Pestronk A, Walter MC, Paradas C, Stojkovic T, Mori-Yoshimura M, Bravver E, Pegoraro E, Lowes LP, Mendell JR, Bushby K, Straub V

Publication type: Article

Publication status: Published

Journal: Neuromuscular Disorders

Year: 2021

Volume: 31

Issue: 4

Pages: 265-280

Print publication date: 01/04/2021

Online publication date: 21/01/2021

Acceptance date: 18/01/2021

Date deposited: 08/04/2021

ISSN (print): 0960-8966

ISSN (electronic): 1873-2364

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.nmd.2021.01.009

DOI: 10.1016/j.nmd.2021.01.009


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