| First Author | Vydyanath A | Year | 2012 |
| Journal | J Muscle Res Cell Motil | Volume | 33 |
| Issue | 1 | Pages | 61-74 |
| PubMed ID | 22415774 | Mgi Jnum | J:308091 |
| Mgi Id | MGI:6725934 | Doi | 10.1007/s10974-012-9286-9 |
| Citation | Vydyanath A, et al. (2012) Axial distribution of myosin binding protein-C is unaffected by mutations in human cardiac and skeletal muscle. J Muscle Res Cell Motil 33(1):61-74 |
| abstractText | Myosin binding protein-C (MyBP-C), a major thick filament associated sarcomeric protein, plays an important functional and structural role in regulating sarcomere assembly and crossbridge formation. Missing or aberrant MyBP-C proteins (both cardiac and skeletal) have been shown to cause both cardiac and skeletal myopathies, thereby emphasising its importance for the normal functioning of the sarcomere. Mutations in cardiac MyBP-C are a major cause of hypertrophic cardiomyopathy (HCM), while mutations in skeletal MyBP-C have been implicated in a disease of skeletal muscle-distal arthrogryposis type 1 (DA-1). Here we report the first detailed electron microscopy studies on human cardiac and skeletal tissues carrying MyBP-C gene mutations, using samples obtained from HCM and DA-1 patients. We have used established image averaging methods to identify and study the axial distribution of MyBP-C on the thick filament by averaging profile plots of the A-band of the sarcomere from electron micrographs of human cardiac and skeletal myopathy specimens. Due to the difficulty of obtaining normal human tissue, we compared the distribution to the A-band structure in normal frog skeletal, rat cardiac muscle and in cardiac muscle of MyBP-C-deficient mice. Very similar overall profile averages were obtained from the C-zones in cardiac HCM samples and skeletal DA-1 samples with MyBP-C gene mutations, suggesting that mutations in MyBP-C do not alter its mean axial distribution along the thick filament. |
