Striking phenotypic variability in two familial cases of myosin storage myopathy with a MYH7 Leu1793pro mutation

Neuromuscular Disorders : NMD
Emmanuelle Uro-CosteMarie-Bernadette Delisle

Abstract

Myosin Storage Myopathies (MSM) have emerged as a new group of inherited myopathies with heterogenous clinical severity and age of onset. We have identified in a woman and her daughter, a pLeu1793Pro mutation in MYH7. This mutation has already been reported to be associated with MSM presenting as neonatal hypotony. Our index case complained of proximal muscle weakness at age 30. Her daughter presented at birth with a cardiomyopathy without any skeletal muscle involvement. This report underlines the clinical variability of MSM even with a given mutation or in a same family.

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Citations

Aug 25, 2012·Acta Neuropathologica·Homa Tajsharghi, Anders Oldfors
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Jan 27, 2017·PloS One·Martin Dahl-HalvarssonHoma Tajsharghi
Mar 16, 2019·Journal of Neurology·Helle PetriJohn Vissing

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