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Published on: August 8, 2022
Novel CLN3 mutation causing autophagic vacuolar myopathy
Andrea Cortese1, Arianna Tucci2, Giovanni Piccolo2
1From the IRCCS National Institute of Neurology C. Mondino Foundation (A.C., G.P., C.A.G., E.M., C.C., G. Grieco, I.R., A.M.), Pavia, Italy; Department of Molecular Neuroscience, Reta Lila Weston Research Laboratories and MRC Centre for Neuromuscular Diseases (A.T., A.P., J.H.), and Department of Neurodegenerative Disease (P.F.), UCL Institute of Neurology, London, UK; Neuromuscular Unit (P.C., L.N., V.L., M.R., R.V., G.F., M.M.), Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Dino Ferrari Centre, Università di Milano, Italy; Neurology Unit (G. Grampa), Saronno Hospital, Italy; MRC Laboratory for Molecular Cell Biology (S.E.M.), Department of Genetics, Evolution and Environment, and UCL Institute of Child Health, University College London, UK; and Department of Neurological Sciences (A.M.), University of Pavia, Italy. andrea.cortese@mondino.it.
Genetic analysis identified a novel CLN3 mutation in two brothers with a rare syndrome including autophagic vacuolar myopathy and cardiomyopathy. This finding expands the known clinical spectrum of CLN3 disease.
Area of Science:
- Genetics
- Neurology
- Cardiology
Background:
- Autophagic vacuolar myopathy (AVM) is a rare neuromuscular disorder.
- Complex syndromes involving myopathy, cardiomyopathy, retinal degeneration, and epilepsy require precise genetic diagnosis.
Observation:
- Two brothers presented with a unique phenotype: visual failure, epilepsy, hypertrophic cardiomyopathy, and mild cognitive impairment.
- Muscle biopsies showed characteristic features of AVM with autophagic vacuoles.
Findings:
- Homozygosity mapping and exome sequencing identified a novel p.Gly165Glu mutation in the CLN3 gene.
- This mutation was found to be the genetic cause of the observed complex syndrome.
Implications:
- This study broadens the recognized clinical presentation of CLN3 disease.
- Genetic testing for CLN3 mutations is recommended for patients with AVM and related symptoms.
- Understanding the genetic basis of such syndromes aids in diagnosis and potential therapeutic strategies.
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