We present a undescribed condition in a girl who died at 8 years of hypertrophic cardiomyopathy. Muscle and endomyocardial biopsies disclosed a selective loss of thick filaments ultrastructurally. In muscle biopsy histochemical abnormalities of myofibrillar AT-Pase were confined to type 1 fibres. Gel electrophoresis of muscle homogenate showed no qualitative abnormalities of slow and fast myosin heavy chains (MHC) and light chains, and the amount of the different myosin isozymes was in agreement with histochemical myofibrillar ATPase findings. The pathogenetic mechanisms have not been elucidated in this case but we suspect an abnormality of the β-cardiac MHC gene, the only gene expressed in the heart and in type 1 skeletal muscle fibres.
|Number of pages||5|
|Journal||Virchows Archiv A Pathological Anatomy and Histopathology|
|Publication status||Published - Jul 1993|
- Slow myosin heavy chain
ASJC Scopus subject areas
- Pathology and Forensic Medicine