Human Molecular Genetics, Vol 8, 2191-2198, Copyright © 1999 by Oxford University Press
G Sj#berg, CA Saavedra-Matiz, DR Rosen, EM Wijsman, K Borg, S H Horowitz and T Sejersen
In some myopathies of distal onset, the intermediate filament desmin is
abnormally accumulated in skeletal and cardiac muscle. We report the first
point mutation in desmin cosegregating with an autosomal dominant form of
desmin-related myopathy. The L345P desmin missense mutation occurs in a
large, six generation Ashkenazi Jewish family. The mutation is located in
an evolutionarily highly conserved position of the desmin coiled-coil rod
domain important for dimer formation. L345P desmin is incapable of forming
filamentous networks in transfected HeLa and SW13 cells. We conclude that
the L345P desmin missense mutation causes myopathy by interfering in a
dominant-negative manner with the dimerization-polymerization process of
intermediate filament assembly.
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A missense mutation in the desmin rod domain is associated with autosomal dominant distal myopathy, and exerts a dominant negative effect on filament formation
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