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Evidence for a dominant negative disease mechanism in cap myopathy due to TPM3.

Leigh Waddell 1, 2 Michaela Kreissl 1 Andrew Kornberg 3 Paul Kennedy 4 Catriona Mclean 4, 5 Annick Labarre-Vila 6 Nicole Monnier 7, 8 Kathryn North 1, 2 Nigel Clarke 1, 2, *
* Corresponding author
1 Institute for Neuroscience and Muscle Research
2 Discipline of Paediatrics and Child Health
3 Department of Neurology
4 State Neuropathology Service, Department of Pathology
5 Department of Anatomical Pathology
6 Centre de Reference des Maladies Neuromusculaires
7 GIN - Grenoble Institut des Neurosciences
8 Laboratoire de biochimie et génétique moléculaire
Abstract : We report a third patient with typical cap myopathy due to a heterozygous TPM3 mutation, confirming the importance of this causal association. The p.R168C TPM3 mutation we identified has been reported in two previous patients. The histological changes associated with this mutation vary widely from typical cap myopathy with near complete type 1 predominance (two patients), to typical congenital fibre-type disproportion without protein inclusions (one patient). We performed 2D-gel electrophoresis using muscle biopsies from two patients with the p.R168C mutation and show that mutant protein accounts for around 50% of alpha-tropomyosin(slow) in sarcomeres, consistent with a dominant negative mechanism of disease pathogenesis.
Keywords : TPM3 Cap myopathy Congenital fibre-type disproportion Dominant negative disease
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Submitted on : Wednesday, July 13, 2011 - 1:13:41 PM
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Leigh Waddell, Michaela Kreissl, Andrew Kornberg, Paul Kennedy, Catriona Mclean, et al.. Evidence for a dominant negative disease mechanism in cap myopathy due to TPM3.. Neuromuscul Disord, 2010, 20 (7), pp.464-6. ⟨10.1016/j.nmd.2010.05.012⟩. ⟨inserm-00589053⟩

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