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Neurology. 2016 Jul 5;87(1):71-6. doi: 10.1212/WNL.0000000000002800. Epub 2016 Jun 8.

The genetic basis of undiagnosed muscular dystrophies and myopathies: Results from 504 patients.

Author information

1
From the Dipartimento di Biochimica Biofisica e Patologia Generale (M.S., G.D.F., A. Torella, A.G., T.G., F.D.V.B., G.E., G.P., V.N.), Seconda Università di Napoli; Telethon Institute of Genetics and Medicine (M.S., G.D.F., A. Torella, M. Mutarelli, V.S.M., A.G., T.G., G.E., V.N.), Pozzuoli; U.O.C. Neurologia Pediatrica e Malattie Muscolari (C.F., C.M., C.B.), IRCCS Istituto Giannina Gaslini, Genova; Centro Dino Ferrari, Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti (F.M., D.R., G.P.C.), and Neuromuscular and Rare Disease Unit, Dipartimento di Neuroscienze (M. Moggio), Università degli Studi di Milano, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milan; Dipartimento di Neuroscienze (M. Fanin, E.P.), Università di Padova; Dipartimento di Neuroscienze e Scienze Riproduttive ed Odontostomatologiche (L.R., L.S.), Università degli Studi di Napoli "Federico II," Napoli; Dipartimento di Medicina Clinica e Sperimentale (G.R., G.S.), Università degli Studi di Pisa; Medicina Molecolare (G.A., F.M.S.), IRCCS Fondazione Stella Maris, Pisa; Dipartimento di Medicina Sperimentale (L. Passamano, P.D., R.P., L. Politano) and Dipartimento di Scienze Mediche, Chirurgiche, Neurologiche, Metaboliche, e dell'Invecchiamento (O.F., S.S., G.D.I.), Seconda Università di Napoli; Dipartimento di Neuroscienze (A.R., M. Mora, L.M.), Istituto Besta, Milano; Don Carlo Gnocchi ONLUS Foundation (G.T.), Milano; Dipartimento di Neuroscienze (A.D., E.B.), IRCCS Ospedale Pediatrico Bambino Gesù, Roma, Italy; Center for Medical Genetics (S.J., K.C.) and Department of Neurology (J.D.B.), Ghent University Hospital, Belgium; Dipartimento di Neuroscienze (O.M., C.R., S.M., A. Toscano), Università degli Studi di Messina, Italy; Folkhälsan Institute of Genetics (A.E., P.H., B.U.), University of Helsinki, Finland; Section for Neuromuscular Diseases and Neuropathies (M. Filosto), Unit of Clinical Neurology, University Hospital 'Spedali Civili,' Brescia, Italy; Neuromusc

Abstract

OBJECTIVE:

To apply next-generation sequencing (NGS) for the investigation of the genetic basis of undiagnosed muscular dystrophies and myopathies in a very large cohort of patients.

METHODS:

We applied an NGS-based platform named MotorPlex to our diagnostic workflow to test muscle disease genes with a high sensitivity and specificity for small DNA variants. We analyzed 504 undiagnosed patients mostly referred as being affected by limb-girdle muscular dystrophy or congenital myopathy.

RESULTS:

MotorPlex provided a complete molecular diagnosis in 218 cases (43.3%). A further 160 patients (31.7%) showed as yet unproven candidate variants. Pathogenic variants were found in 47 of 93 genes, and in more than 30% of cases, the phenotype was nonconventional, broadening the spectrum of disease presentation in at least 10 genes.

CONCLUSIONS:

Our large DNA study of patients with undiagnosed myopathy is an example of the ongoing revolution in molecular diagnostics, highlighting the advantages in using NGS as a first-tier approach for heterogeneous genetic conditions.

PMID:
27281536
PMCID:
PMC4932234
DOI:
10.1212/WNL.0000000000002800
[Indexed for MEDLINE]
Free PMC Article

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