Abstract
Hypertrophic cardiomyopathy and dilated cardiomyopathy are two major clinical phenotypes of “idiopathic” cardiomyopathy. Recent molecular genetic analyses have now revealed that “idiopathic” cardiomyopathy is caused by mutations in genes for sarcomere components. We have recently reported several mutations in titin/connectin gene found in patients with hypertrophic cardiomyopathy or dilated cardiomyopathy. A hypertrophic cardiomyopathy-associated titin/connectin mutation (Arg740Leu) was found to increase the binding to actinin, while other dilated cardiomyopathy-associated titin/connectin mutations (Ala743Val and Val54Met) decreased the binding to actinin and Tcap/telethonin, respectively. We also reported several other mutations in the N2-B region of titin/connectin found in hypertrophic cardiomyopathy and dilated cardiomyopathy. Since the N2-B region expresses only in the heart, it was speculated that functional alterations due to the mutations cause cardiomyopathies. In this study, we investigated the functional changes caused by the N2-B region mutations by using yeast-two-hybrid assays. It was revealed that a hypertrophic cardiomyopathy-associated mutation (Ser3799Tyr) increased the binding to FHL2 protein, whereas a dilated cardiomyopathy-associated mutation (Gln4053ter) decreased the binding. In addition, another TTN mutation (Arg25618Gln) at the is2 region was found in familial DCM. Because FHL2 protein is known to tether metabolic enzymes to N2-B and is2 regions of titin/connectin, these observations suggest that altered recruitment of metabolic enzymes to the sarcomere may play a role in the pathogenesis of cardiomyopathies.
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Abbreviations
- DCM:
-
dilated cardiomyopathy
- FHL2:
-
four and half LIM protein 2
- HCM:
-
hypertrophic cardiomyopathy
- MLP:
-
muscle LIM protein
- Tcap:
-
titin-cap
- Y2H:
-
yeast two hybrid
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Acknowledgements
This work was supported in part by Grant-in-Aids for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan and a research grant from the Ministry of Health, Labor and Welfare, Japan and Mitsui Life Social Welfare Foundation. We are grateful to Drs H. Toshima, H. Nishi, Y. Koga, K. Matsuyama, T. Sakamoto, K. Kawai, K.␣Kawamura, R. Kusukawa, M. Nagano, Y.␣Nimura, R. Okada, T. Sugimoto, H. Tanaka, H. Yasuda, K. Fukuda, S. Ogawa, A. Matsumori, S. Sasayama, R. Nagai, and Y. Yazaki for their contributions in clinical evaluation and blood sampling from patients with HCM and DCM
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MATSUMOTO, Y., HAYASHI, T., INAGAKI, N. et al. Functional analysis of titin/connectin N2-B mutations found in cardiomyopathy. J Muscle Res Cell Motil 26, 367–374 (2005). https://doi.org/10.1007/s10974-005-9018-5
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DOI: https://doi.org/10.1007/s10974-005-9018-5