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Purpose of review: The aim of this communication is to provide an up-to-date overview of myofibrillar myopathies (MFMs).

Recent findings: The most important recent advance in the MFMs has been the identification of mutation in Bag3 (Bcl-2-associated athanogene-3) as a new cause of MFM. Although, the typical clinical manifestations of MFMs are slowly progressive weakness, the patients with Bag3opathy may have had a rapidly progressive and more severe phenotype.

Summary: Several MFM disease genes have recently been recognized. The identified disease proteins (desmin, [alpha]B-crystallin, myotilin, Zasp, filamin C, and Bag3) interact with components or with chaperones of the Z-disk. In each case the molecular defect leads to a largely stereotyped cascade of structural perturbation of the muscle fiber architecture.

(C) 2010 Lippincott Williams & Wilkins, Inc.