Genetic Screening and Double Mutation in Japanese Patients With Hypertrophic Cardiomyopathy

• Kubo Toru

  Department of Medicine and Geriatrics, Kochi Medical School

• Kitaoka Hiroaki

  Department of Medicine and Geriatrics, Kochi Medical School

• Okawa Makoto

  Department of Medicine and Geriatrics, Kochi Medical School

• Baba Yuichi

  Department of Medicine and Geriatrics, Kochi Medical School

• Hirota Takayoshi

  Department of Medicine and Geriatrics, Kochi Medical School

• Hayato Kayo

  Department of Medicine and Geriatrics, Kochi Medical School

• Yamasaki Naohito

  Department of Medicine and Geriatrics, Kochi Medical School

• Matsumura Yoshihisa

  Department of Medicine and Geriatrics, Kochi Medical School

• Otsuka Haruna

  Department of Molecular Pathogenesis, Medical Research Institute, Tokyo Medical and Dental University

• Arimura Takuro

  Department of Molecular Pathogenesis, Medical Research Institute, Tokyo Medical and Dental University

• Kimura Akinori

  Department of Molecular Pathogenesis, Medical Research Institute, Tokyo Medical and Dental University

• Doi Yoshinori L.

  Department of Medicine and Geriatrics, Kochi Medical School

Abstract

Background: Hypertrophic cardiomyopathy (HCM) is a primary myocardial disorder with an autosomal-dominant pattern of inheritance mainly caused by single heterozygous mutations in sarcomere genes. Although multiple gene mutations have recently been reported in Western countries, clinical implications of multiple mutations in Japanese subjects are not clear. Methods and Results: A comprehensive genetic analysis of 5 sarcomere genes (cardiac β-myosin heavy chain gene [MYH7], cardiac myosin-binding protein C gene [MYBPC3], cardiac troponin T gene [TNNT2], α-tropomyosin gene [TPM1] and cardiac troponin I gene [TNNI3]) was performed in 93 unrelated patients and 14 mutations were identified in 28 patients. Twenty-six patients had single heterozygosity (20 in MYBPC3, 4 in MYH7, 1 in TNNT2, 1 in TNNI3), whereas 2 proband patients with familial HCM had double heterozygosity: 1 with P106fs in MYBPC3 and R869C in MYH7 and 1 with R945fs in MYBPC3 and E1049D in MYH7. From the results of the family survey and the previous literature on HCM mutations, P106fs, R945fs and R869C seemed to be pathological mutations and E1049D might be a rare polymorphism. The proband patient with P106fs and R869C double mutation was diagnosed as having HCM at an earlier age (28 years of age) than her relatives with single mutation, and had greater wall thickness with left ventricular outflow obstruction. Conclusions: One double mutation was identified in a Japanese cohort of HCM patients. Further studies are needed to clarify the clinical significance of multiple mutations including phenotypic severity. (Circ J 2011; 75: 2654-2659)<br>

Journal

• Circulation Journal

  Circulation Journal 75 (11), 2654-2659, 2011

  The Japanese Circulation Society

Keywords

• Double mutation
• Genetic screening
• Hypertrophic cardiomyopathy
• Sarcomere protein genes

Details

• CRID: 1390282680081031296
• NII Article ID: 10030032426
• NII Book ID: AA11591968
• DOI: 10.1253/circj.cj-10-1314
• COI: 1:CAS:528:DC%2BC3MXhsFamtr7P
• ISSN: 13474820
• ISSN: 13469843
• PubMed: 21799269
• Web Site: http://www.jstage.jst.go.jp/article/circj/75/11/75_CJ-10-1314/_pdf
• Web Site: https://search.jamas.or.jp/link/ui/2012169913
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • PubMed
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed