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Centronuclear myopathy 2

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Prevalence of clinical parameters (%)

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List of symptoms

Symptom/sign Organ system Percent affected Pubmed id Added on(yyyy-mm-dd) Edit/add reference
Central nuclei in myotubes skeletal 100 % 17676042 2013-07-11
Muscle weakness skeletal 100 % 17676042 2013-07-11
Ptosis skeletal 50 % 17676042 2013-07-11
Contracture skeletal 50 % 17676042 2013-07-11
Ophthalmoplegia skeletal 25 % 17676042 2013-07-11

List of references:

Mutations in amphiphysin 2 (BIN1) disrupt interaction with dynamin 2 and cause autosomal recessive centronuclear myopathy.
Anne-Sophie Nicot, Anne Toussaint, Valérie Tosch, Christine Kretz, Carina Wallgren-Pettersson, Erik Iwarsson, Helen Kingston, Jean-Marie Garnier, Valérie Biancalana, Anders Oldfors, Jean-Louis Mandel, Jocelyn Laporte,

Centronuclear myopathies are characterized by muscle weakness and abnormal centralization of nuclei in muscle fibers not secondary to regeneration. The severe neonatal X-linked form (myotubular myopathy) is due to mutations in the phosphoinositide phosphatase myotubularin (MTM1), whereas mutations in dynamin 2 (DNM2) have been found in some autosomal dominant cases. By direct sequencing of functional candidate genes, we identified homozygous mutations in amphiphysin 2 (BIN1) in three families with autosomal recessive inheritance. Two missense mutations affecting the BAR (Bin1/amphiphysin/RVS167) domain disrupt its membrane tubulation properties in transfected cells, and a partial truncation of the C-terminal SH3 domain abrogates the interaction with DNM2 and its recruitment to the membrane tubules. Our results suggest that mutations in BIN1 cause centronuclear myopathy by interfering with remodeling of T tubules and/or endocytic membranes, and that the functional interaction between BIN1 and DNM2 is necessary for normal muscle function and positioning of nuclei.

Nature genetics - Sep 2007

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