Human Molecular Genetics, Vol 7, 2135-2140, Copyright © 1998 by Oxford University Press
P Bonaldo, P Braghetta, M Zanetti, S Piccolo, D Volpin and GM Bressan
To gain insight into the function of type VI collagen, the col6a1 gene was
inactivated by targeted gene disruption in the mouse. The homozygous
mutants lacked collagen VI in the tissues and showed histological features
of myopathy such as fiber necrosis and phagocytosis and a pronounced
variation in the fiber diameter. Muscles also showed signs of stimulated
regeneration of fibers. Necrotic fibers were particularly frequent in the
diaphragm at all ages examined. Similar, although milder, alterations were
detected in heterozygous mutant mice, indicating haploinsufficiency of the
col6a1 gene function. The data led us to conclude that collagen VI is
necessary for maintenance of the integrity of muscle fibers and that the
col6a1 - deficient mouse can be considered an animal model of Bethlem
myopathy.
ARTICLES
Collagen VI deficiency induces early onset myopathy in the mouse: an animal model for Bethlem myopathy
Institute of Histology and Embryology, University of Padova, Via G. Colombo 3, 35100 Padova, Italy.
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