Ruparelia, A.A., Zhao, M., Currie, P.D., and Bryson-Richardson, R.J. (2012) Characterization and Investigation of zebrafish models of Filamin related myofibrillar myopathy. Human molecular genetics. 21(18):4073-4083.
Myofibrillar myopathies are a group of muscle disorders characterized by the disintegration of skeletal muscle fibers and
formation of sarcomeric protein aggregates. All the proteins known to be involved in myofibrillar myopathies localize to a
region of the sarcomere known as the Z-disk, the site at which defects are first observed. Given the common cellular phenotype
observed in this group of disorders it is thought that there is a common mechanism of pathology. Mutations in Filamin C, which
has several proposed roles in the development and function of skeletal muscle, can result in Filamin related myofibrillar
myopathy. The lack of a suitable animal model system has limited investigation into the mechanism of pathology in this disease
and the role of Filamin C in muscle development. Here we characterize stretched out (sot), a zebrafish filamin Cb mutant, together with targeted knockdown of zebrafish filamin Ca, revealing fiber dissolution and formation of protein aggregates strikingly similar to those seen in Filamin related myofibrillar
myopathies. Through knockdown of both zebrafish Filamin C homologues we demonstrate that Filamin C is not required for fiber
specification and that fiber damage is a consequence of muscle activity. The remarkable similarities in the myopathology between
our models and Filamin related myofibrillar myopathy makes them suitable for the study of these diseases and provides unique
opportunities for the investigation of the function of Filamin C in muscle and development of therapies.