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Nemaline myopathy with minicores caused by mutation of the CFL2 gene encoding the skeletal muscle actin-binding protein, cofilin-2.

Agrawal P.B., Greenleaf R.S., Tomczak K.K., Lehtokari V.-L., Wallgren-Pettersson C., Wallefeld W., Laing N.G., Darras B.T., Maciver S.K., Dormitzer P.R., Beggs A.H.

Nemaline myopathy (NM) is a congenital myopathy characterized by muscle weakness and nemaline bodies in affected myofibers. Five NM genes, all encoding components of the sarcomeric thin filament, are known. We report identification of a sixth gene, CFL2, encoding the actin-binding protein muscle cofilin-2, which is mutated in two siblings with congenital myopathy. The proband's muscle contained characteristic nemaline bodies, as well as occasional fibers with minicores, concentric laminated bodies, and areas of F-actin accumulation. Her affected sister's muscle was reported to exhibit nonspecific myopathic changes. Cofilin-2 levels were significantly lower in the proband's muscle, and the mutant protein was less soluble when expressed in Escherichia coli, suggesting that deficiency of cofilin-2 may result in reduced depolymerization of actin filaments, causing their accumulation in nemaline bodies, minicores, and, possibly, concentric laminated bodies.

Am. J. Hum. Genet. 80:162-167(2007) [PubMed] [Europe PMC]

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