Cardiac Ankyrin Repeat Protein Gene (ANKRD1) Mutations in Hypertrophic Cardiomyopathy

Takuro Arimura, J. Martijn Bos, Akinori Sato, Toru Kubo, Hiroshi Okamoto, Hirofumi Nishi, Haruhito Harada, Yoshinori Koga, Mousumi Moulik, Yoshinori L. Doi, Jeffrey A. Towbin, Michael J. Ackerman, Akinori Kimura

Research output: Contribution to journalArticle

108 Scopus citations

Abstract

Objectives: The purpose of this study was to explore a novel disease gene for hypertrophic cardiomyopathy (HCM) and to evaluate functional alterations caused by mutations. Background: Mutations in genes encoding myofilaments or Z-disc proteins of the cardiac sarcomere cause HCM, but the disease-causing mutations can be found in one-half of the patients, indicating that novel HCM-susceptibility genes await discovery. We studied a candidate gene, ankyrin repeat domain 1 (ANKRD1), encoding for the cardiac ankyrin repeat protein (CARP) that is a Z-disc component interacting with N2A domain of titin/connectin and N-terminal domain of myopalladin. Methods: We analyzed 384 HCM patients for mutations in ANKRD1 and in the N2A domain of titin/connectin gene (TTN). Interaction of CARP with titin/connectin or myopalladin was investigated using coimmunoprecipitation assay to demonstrate the functional alteration caused by ANKRD1 or TTN mutations. Functional abnormalities caused by the ANKRD1 mutations were also examined at the cellular level in neonatal rat cardiomyocytes. Results: Three ANKRD1 missense mutations, Pro52Ala, Thr123Met, and Ile280Val, were found in 3 patients. All mutations increased binding of CARP to both titin/connectin and myopalladin. In addition, TTN mutations, Arg8500His, and Arg8604Gln in the N2A domain were found in 2 patients, and these mutations increased binding of titin/connectin to CARP. Myc-tagged CARP showed that the mutations resulted in abnormal localization of CARP in cardiomyocytes. Conclusions: CARP abnormalities may be involved in the pathogenesis of HCM.

Original languageEnglish (US)
Pages (from-to)334-342
Number of pages9
JournalJournal of the American College of Cardiology
Volume54
Issue number4
DOIs
StatePublished - Jul 21 2009

Keywords

  • Z-disc
  • cardiac ankyrin repeat protein
  • hypertrophic cardiomyopathy
  • mutation
  • titin/connectin

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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    Arimura, T., Bos, J. M., Sato, A., Kubo, T., Okamoto, H., Nishi, H., Harada, H., Koga, Y., Moulik, M., Doi, Y. L., Towbin, J. A., Ackerman, M. J., & Kimura, A. (2009). Cardiac Ankyrin Repeat Protein Gene (ANKRD1) Mutations in Hypertrophic Cardiomyopathy. Journal of the American College of Cardiology, 54(4), 334-342. https://doi.org/10.1016/j.jacc.2008.12.082