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

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Item Type:Article
Title:Miyoshi myopathy and limb girdle muscular dystrophy R2 are the same disease
Creators Name:Moore, U. and Gordish, H. and Diaz-Manera, J. and James, M.K. and Mayhew, A.G. and Guglieri, M. and Torron, R.F. and Rufibach, L.E. and Feng, J. and Blamire, A.M. and Carlier, P.G. and Spuler, S. and Day, J.W. and Jones, K.J. and Bharucha-Goebel, D.X. and Salort-Campana, E. and Pestronk, A. and Walter, M.C. and Paradas, C. and Stojkovic, T. and Mori-Yoshimura, M. and Bravver, E. and Pegoraro, E. and Lowes, L.P. and Mendell, J.R. and Bushby, K. and Straub, V.
Abstract:This 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.
Keywords:Clinical Neurology Examination, Clinical Trials Methodology, Cohort Study, All Neuromuscular Disease, Muscle Disease
Source:Neuromuscular Disorders
Page Range:265-280
Date:April 2021
Official Publication:https://doi.org/10.1016/j.nmd.2021.01.009
PubMed:View item in PubMed

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