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

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 pr...

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Authors: Moore, Ursula|||0000-0002-0643-5596, Gordish-Dressman, Heather|||0000-0002-2330-5427, Diaz-Manera, Jordi|||0000-0003-2941-7988, James, Meredith K.|||0000-0001-8078-7744, Mayhew, Anna G.|||0000-0001-7085-9011, Guglieri, Michela|||0000-0002-8455-0637, Fernandez-Torron, Roberto|||0000-0002-2202-8165, Rufibach, Laura E.|||0000-0001-8208-0574, Feng, Jia, Blamire, Andrew|||0000-0002-8749-1257, Carlier, Pierre G.|||0000-0002-2315-6927, Spuler, Simone|||0000-0002-0155-1117, Day, John W.|||0000-0002-0086-9529, Jones, Kristi J., Bharucha-Goebel, Diana|||0000-0002-7437-0982, Salort-Campana, Emmanuelle|||0000-0002-1846-3017, Pestronk, Alan|||0000-0002-8991-5770, Walter, Maggie C.|||0000-0002-7611-4827, Paradas, Carmen|||0000-0002-6917-2236, Stojkovic, Tanya|||0000-0002-4054-2838, Mori-Yoshimura, Madoka|||0000-0003-4312-9114, Bravver, Elena, Pegoraro, Elena|||0000-0002-7740-4156, Lowes, Linda P.|||0000-0003-4206-0557, Mendell, Jerry R.|||0000-0002-2691-0200, Bushby, Kate|||0000-0001-8818-4008, Straub, Volker|||0000-0001-9046-3540
Format: article
Publication Date:2021
Country:España
Institution:Universitat Autònoma de Barcelona
Repository:Dipòsit Digital de Documents de la UAB
Language:English
OAI Identifier:oai:ddd.uab.cat:272088
Online Access:https://ddd.uab.cat/record/272088
https://dx.doi.org/urn:doi:10.1016/j.nmd.2021.01.009
Access Level:Open access
Keyword:Clinical neurology examination
Clinical trials methodology
Cohort study
All neuromuscular disease
Muscle disease
Description
Summary: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.

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