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Guo X, Huang M, Song C, Nie C, Zheng X, Zhou Z, Wang S, Huang X. MYH7 mutation is associated with mitral valve leaflet elongation in patients with obstructive hypertrophic cardiomyopathy. Heliyon 2024; 10:e34727. [PMID: 39130421 PMCID: PMC11315070 DOI: 10.1016/j.heliyon.2024.e34727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 06/20/2024] [Accepted: 07/15/2024] [Indexed: 08/13/2024] Open
Abstract
Mitral valve (MV) leaflet elongation is recognized as a primary phenotypic expression of hypertrophic cardiomyopathy (HCM) that contributes to obstruction. This study investigates the correlation between MV length and genotype mutations in the two predominant genes, myosin-binding protein C (MYBPC3), and the β-myosin heavy chain (MYH7) in patients with obstructive HCM (OHCM). Among the 402 OHCM patients, there were likely pathogenic or pathogenic variations in MYH7 (n = 94) and MYBPC3 (n = 76), along with a mutation-negative group (n = 212). Compared to genotype-negative patients, genotype-positive individuals exhibited elongated MV length, thicker interventricular septum, and increased instances of late gadolinium enhancement. Notably, MYH7 mutations were associated with a more severe disease trajectory than MYBPC3 mutations. After adjusting for potential confounders, multivariate linear regression analysis revealed that MYH7 gene mutations and left ventricular volume were independently associated with MV leaflet elongation. The study indicates that mutations in MYH7 and hemodynamics factors are significant risk factors for elongated MV leaflet. Consequently, regular assessment of MV length, especially in patients with MYH7 mutation and enlarged LV volume, is crucial for timely preoperative strategic planning and improved prognosis.
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Affiliation(s)
- Xinli Guo
- Department of Cardiology, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishilu, Beijing, 100037, China
| | - Manyun Huang
- Department of Heart Failure, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai, 200120, China
| | - Changpeng Song
- Department of Cardiology, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishilu, Beijing, 100037, China
| | - Changrong Nie
- Department of Cardiovascular Surgery, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishilu, Beijing, 100037, China
| | - Xinxin Zheng
- Department of Cardiology, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishilu, Beijing, 100037, China
| | - Zhou Zhou
- Department of Cardiology, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishilu, Beijing, 100037, China
| | - Shuiyun Wang
- Department of Cardiovascular Surgery, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishilu, Beijing, 100037, China
| | - Xiaohong Huang
- Department of Cardiology, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishilu, Beijing, 100037, China
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Schwegel N, Zach D, Peikert A, Santner V, Höller V, Gollmer J, Späth J, Riepl H, Rainer PP, Wallner M, Pilz S, Zirlik A, von Lewinski D, Ablasser K, Verheyen N, Kolesnik E. The Prognostic Value of Right Ventricular Function in Patients with Chronic Heart Failure-A Prospective Study. J Clin Med 2024; 13:1930. [PMID: 38610695 PMCID: PMC11012981 DOI: 10.3390/jcm13071930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2024] [Revised: 03/19/2024] [Accepted: 03/25/2024] [Indexed: 04/14/2024] Open
Abstract
Background: In patients with stable chronic heart failure with a reduced ejection fraction (HFrEF), left ventricular ejection fraction (LVEF) provides limited prognostic value, especially in patients with moderately to severely reduced LVEF. Echocardiographic parameters of right ventricular function may be associated with adverse clinical events in these patients. Therefore, we analyzed 164 patients with HFrEF in a prospective single-center cohort study to evaluate whether the parameters of right ventricular function are associated with worsening heart failure (WHF) hospitalizations, cardiovascular and all-cause deaths and combined endpoints. Methods: Echocardiographic cine loops were analyzed using vendor-independent post-processing software. Multivariate Cox regression analyses were performed, which were then adjusted for clinical characteristics and left ventricular functional parameters. Results: In these models, higher tricuspid annular plane systolic excursion (TAPSE) was significantly associated with lower rates of WHF hospitalizations (HR 0.880, 95%CI 0.800-0.968, p = 0.008), a composite endpoint of WHF hospitalizations and cardiovascular death (HR 0.878, 95%CI 0.800-0.964, p = 0.006), and a composite endpoint of WHF hospitalization and all-cause death (HR 0.918, 95%CI 0.853-0.988, p = 0.023). These associations were more pronounced in patients with LVEF ≤ 35%. Conclusions: In conclusion, in patients with HFrEF, TAPSE is an independent prognosticator for adverse clinical outcomes, warranting further studies to elucidate whether incorporating TAPSE into established risk scores improves their diagnostic accuracy.
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Affiliation(s)
- Nora Schwegel
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - David Zach
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - Alexander Peikert
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - Viktoria Santner
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - Viktoria Höller
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - Johannes Gollmer
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - Johannes Späth
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - Hermann Riepl
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - Peter P. Rainer
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
- Department of Medicine, St. Johann in Tirol General Hospital, 6380 St. Johann in Tirol, Austria
- BioTechMed Graz, 8010 Graz, Austria
| | - Markus Wallner
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - Stefan Pilz
- Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, 8036 Graz, Austria
| | - Andreas Zirlik
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - Dirk von Lewinski
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - Klemens Ablasser
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - Nicolas Verheyen
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
| | - Ewald Kolesnik
- Division of Cardiology, University Heart Center Graz, Medical University of Graz, 8036 Graz, Austria
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Gao Y, Peng L, Zhao C. MYH7 in cardiomyopathy and skeletal muscle myopathy. Mol Cell Biochem 2024; 479:393-417. [PMID: 37079208 DOI: 10.1007/s11010-023-04735-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 04/07/2023] [Indexed: 04/21/2023]
Abstract
Myosin heavy chain gene 7 (MYH7), a sarcomeric gene encoding the myosin heavy chain (myosin-7), has attracted considerable interest as a result of its fundamental functions in cardiac and skeletal muscle contraction and numerous nucleotide variations of MYH7 are closely related to cardiomyopathy and skeletal muscle myopathy. These disorders display significantly inter- and intra-familial variability, sometimes developing complex phenotypes, including both cardiomyopathy and skeletal myopathy. Here, we review the current understanding on MYH7 with the aim to better clarify how mutations in MYH7 affect the structure and physiologic function of sarcomere, thus resulting in cardiomyopathy and skeletal muscle myopathy. Importantly, the latest advances on diagnosis, research models in vivo and in vitro and therapy for precise clinical application have made great progress and have epoch-making significance. All the great advance is discussed here.
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Affiliation(s)
- Yuan Gao
- Department of Pediatrics, Qilu Hospital of Shandong University, Jinan, 250012, China
| | - Lu Peng
- Department of Pediatrics, Qilu Hospital of Shandong University, Jinan, 250012, China
| | - Cuifen Zhao
- Department of Pediatrics, Qilu Hospital of Shandong University, Jinan, 250012, China.
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Topriceanu CC, Pereira AC, Moon JC, Captur G, Ho CY. Meta-Analysis of Penetrance and Systematic Review on Transition to Disease in Genetic Hypertrophic Cardiomyopathy. Circulation 2024; 149:107-123. [PMID: 37929589 PMCID: PMC10775968 DOI: 10.1161/circulationaha.123.065987] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 10/27/2023] [Indexed: 11/07/2023]
Abstract
BACKGROUND Hypertrophic cardiomyopathy (HCM) is characterized by unexplained left ventricular hypertrophy and is classically caused by pathogenic or likely pathogenic variants (P/LP) in genes encoding sarcomere proteins. Not all subclinical variant carriers will manifest clinically overt disease because penetrance (proportion of sarcomere or sarcomere-related P/LP variant carriers who develop disease) is variable, age dependent, and not reliably predicted. METHODS A systematic search of the literature was performed. We used random-effects generalized linear mixed model meta-analyses to contrast the cross-sectional prevalence and penetrance of sarcomere or sarcomere-related genes in 2 different contexts: clinically-based studies on patients and families with HCM versus population or community-based studies. Longitudinal family/clinical studies were additionally analyzed to investigate the rate of phenotypic conversion from subclinical to overt HCM during follow-up. RESULTS In total, 455 full-text manuscripts and articles were assessed. In family/clinical studies, the prevalence of sarcomere variants in patients diagnosed with HCM was 34%. The penetrance across all genes in nonproband relatives carrying P/LP variants identified during cascade screening was 57% (95% CI, 52%-63%), and the mean age at HCM diagnosis was 38 years (95% CI, 36%-40%). Penetrance varied from ≈32% for MYL3 (myosin light chain 3) to ≈55% for MYBPC3 (myosin-binding protein C3), ≈60% for TNNT2 (troponin T2) and TNNI3 (troponin I3), and ≈65% for MYH7 (myosin heavy chain 7). Population-based genetic studies demonstrate that P/LP sarcomere variants are present in the background population but at a low prevalence of <1%. The penetrance of HCM in incidentally identified P/LP variant carriers was also substantially lower at ≈11%, ranging from 0% in Atherosclerosis Risk in Communities to 18% in UK Biobank. In longitudinal family studies, the pooled phenotypic conversion across all genes was 15% over an average of ≈8 years of follow-up, starting from a mean of ≈16 years of age. However, short-term gene-specific phenotypic conversion varied between ≈12% for MYBPC3 and ≈23% for MYH7. CONCLUSIONS The penetrance of P/LP variants is highly variable and influenced by currently undefined and context-dependent genetic and environmental factors. Additional longitudinal studies are needed to improve our understanding of true lifetime penetrance in families and in the community and to identify drivers of the transition from subclinical to overt HCM.
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Affiliation(s)
- Constantin-Cristian Topriceanu
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (C.-C.T., A.C.P., C.Y.H.). UCL Institute of Cardiovascular Science (C.-C.T., J.C.M., G.C.) and UCL MRC Unit for Lifelong Health and Ageing (G.C.), University College London, UK. Cardiac MRI Unit, Barts Heart Centre, West Smithfield, London, UK (C.-C.T., J.C.M.). The Royal Free Hospital, Centre for Inherited Heart Muscle Conditions, Cardiology Department, Hampstead, London, UK (G.C.)
| | - Alexandre C. Pereira
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (C.-C.T., A.C.P., C.Y.H.). UCL Institute of Cardiovascular Science (C.-C.T., J.C.M., G.C.) and UCL MRC Unit for Lifelong Health and Ageing (G.C.), University College London, UK. Cardiac MRI Unit, Barts Heart Centre, West Smithfield, London, UK (C.-C.T., J.C.M.). The Royal Free Hospital, Centre for Inherited Heart Muscle Conditions, Cardiology Department, Hampstead, London, UK (G.C.)
| | - James C. Moon
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (C.-C.T., A.C.P., C.Y.H.). UCL Institute of Cardiovascular Science (C.-C.T., J.C.M., G.C.) and UCL MRC Unit for Lifelong Health and Ageing (G.C.), University College London, UK. Cardiac MRI Unit, Barts Heart Centre, West Smithfield, London, UK (C.-C.T., J.C.M.). The Royal Free Hospital, Centre for Inherited Heart Muscle Conditions, Cardiology Department, Hampstead, London, UK (G.C.)
| | - Gabriella Captur
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (C.-C.T., A.C.P., C.Y.H.). UCL Institute of Cardiovascular Science (C.-C.T., J.C.M., G.C.) and UCL MRC Unit for Lifelong Health and Ageing (G.C.), University College London, UK. Cardiac MRI Unit, Barts Heart Centre, West Smithfield, London, UK (C.-C.T., J.C.M.). The Royal Free Hospital, Centre for Inherited Heart Muscle Conditions, Cardiology Department, Hampstead, London, UK (G.C.)
| | - Carolyn Y. Ho
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (C.-C.T., A.C.P., C.Y.H.). UCL Institute of Cardiovascular Science (C.-C.T., J.C.M., G.C.) and UCL MRC Unit for Lifelong Health and Ageing (G.C.), University College London, UK. Cardiac MRI Unit, Barts Heart Centre, West Smithfield, London, UK (C.-C.T., J.C.M.). The Royal Free Hospital, Centre for Inherited Heart Muscle Conditions, Cardiology Department, Hampstead, London, UK (G.C.)
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Zhou N, Weng H, Zhao W, Tang L, Ge Z, Tian F, Meng F, Pan C, Shu X. Gene-echocardiography: refining genotype-phenotype correlations in hypertrophic cardiomyopathy. Eur Heart J Cardiovasc Imaging 2023; 25:127-135. [PMID: 37561025 DOI: 10.1093/ehjci/jead200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 07/30/2023] [Accepted: 08/03/2023] [Indexed: 08/11/2023] Open
Abstract
AIMS This study aims to clarify the association between hypertrophic patterns and genetic variants in hypertrophic cardiomyopathy (HCM) patients, contributing to the advancement of personalized management strategies for HCM. METHODS AND RESULTS A comprehensive evaluation of genetic mutations was conducted in 392 HCM-affected families using Whole Exome Sequencing. Concurrently, relevant echocardiographic data from these individuals were collected. Our study revealed an increased susceptibility to enhanced septal and interventricular septal thickness in HCM patients harbouring gene mutations compared with those without. Mid-septal hypertrophy was found to be associated predominantly with myosin binding protein C3 (MYBPC3) variants, while a higher septum-to-posterior wall ratio correlated with myosin heavy chain 7 (MYH7) variants. Mutations in MYH7, MYBPC3, and other sarcomeric or myofilament genes (troponin I3 [TNNI3], tropomyosin 1 [TPM1], and troponin T2 [TNNT2]) showed a relationship with increased hypertrophy in the anterior wall, interventricular septum, and lateral wall of the left ventricle. In contrast, alpha kinase 3 (ALPK3)-associated hypertrophy chiefly presented in the apical region, while hypertrophy related to titin (TTN) and obscurin (OBSCN) mutations exhibited a uniform distribution across the myocardium. Hypertrophic patterns varied with the type and category of gene mutations, offering valuable diagnostic insights. CONCLUSION Our findings underscore a strong link between hypertrophic patterns and genetic variants in HCM, providing a foundation for more accurate genetic testing and personalized management of HCM patients. The novel concept of 'gene-echocardiography' may enhance the precision and efficiency of genetic counselling and testing in HCM.
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Affiliation(s)
- Nianwei Zhou
- Department of Echocardiography, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Disease, Shanghai Institute of Medical Imaging, Fenglin Road 180, Xuhui District, Shanghai 200032, China
| | - Haobo Weng
- Department of Echocardiography, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Disease, Shanghai Institute of Medical Imaging, Fenglin Road 180, Xuhui District, Shanghai 200032, China
| | - Weipeng Zhao
- Department of Echocardiography, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Disease, Shanghai Institute of Medical Imaging, Fenglin Road 180, Xuhui District, Shanghai 200032, China
| | - Lu Tang
- Department of Echocardiography, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Disease, Shanghai Institute of Medical Imaging, Fenglin Road 180, Xuhui District, Shanghai 200032, China
| | - Zhendan Ge
- Department of Echocardiography, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Disease, Shanghai Institute of Medical Imaging, Fenglin Road 180, Xuhui District, Shanghai 200032, China
| | - Fangyan Tian
- Department of Echocardiography, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Disease, Shanghai Institute of Medical Imaging, Fenglin Road 180, Xuhui District, Shanghai 200032, China
| | - Fangmin Meng
- Department of Echocardiography, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Disease, Shanghai Institute of Medical Imaging, Fenglin Road 180, Xuhui District, Shanghai 200032, China
| | - Cuizhen Pan
- Department of Echocardiography, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Disease, Shanghai Institute of Medical Imaging, Fenglin Road 180, Xuhui District, Shanghai 200032, China
| | - Xianhong Shu
- Department of Echocardiography, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Disease, Shanghai Institute of Medical Imaging, Fenglin Road 180, Xuhui District, Shanghai 200032, China
- Department of Echocardiography, Shanghai Xuhui District Central Hospital, Huaihai Middle Road 966, Xuhui District, Shanghai, China
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Li W, Xing C, Bao L, Han S, Luo T, Wang Z, Fan H. Comprehensive analysis of RNA m6A methylation in pressure overload-induced cardiac hypertrophy. BMC Genomics 2022; 23:576. [PMID: 35953789 PMCID: PMC9373449 DOI: 10.1186/s12864-022-08833-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 08/05/2022] [Indexed: 11/30/2022] Open
Abstract
Aim To analyze and compare the mRNA N6-methyladenosine modifications in transverse aortic constriction induced mice hearts and normal mice hearts. Materials and methods Colorimetric quantification was used to probe the changes in m6A modifications in the total RNA. The expression of m6A-related enzymes was analyzed via qRT-PCR and western blotting. RNA-seq and MeRIP-seq were performed to identify genes with differences in m6A modifications or expression in the transcriptome profile. Results Compared with the control group, the TAC group exhibited higher m6A methylation levels. FTO and WTAP were downregulated after TAC, while METTL3 was significantly downregulated at the protein level. MeRIP-seq revealed that 1179 m6A peaks were upmethylated and 733 m6A peaks were downmethylated, and biological analysis of these genes exhibited a strong relationship with heart function. Conclusion Our findings provide novel information regarding m6A modification and gene expression changes in cardiac hypertrophy, which may be fundamental for further research. Supplementary Information The online version contains supplementary material available at 10.1186/s12864-022-08833-w.
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Affiliation(s)
- Weidong Li
- Department of Physiology and Neurobiology, School of Basic Medical Sciences, Zhengzhou University, No.100 Kexuedadao Road, Zhengzhou, 450000, China
| | - Chenxv Xing
- Department of Physiology and Neurobiology, School of Basic Medical Sciences, Zhengzhou University, No.100 Kexuedadao Road, Zhengzhou, 450000, China
| | - Limeng Bao
- Department of Physiology and Neurobiology, School of Basic Medical Sciences, Zhengzhou University, No.100 Kexuedadao Road, Zhengzhou, 450000, China
| | - Shengna Han
- Department of Pharmacology, School of Basic Medical Sciences, Zhengzhou University, No.100 Kexuedadao Road, Zhengzhou, 450000, China
| | - Tianxia Luo
- Department of Physiology, School of Medicine, Henan University of Chinese Medicine, No.156 Jinshui Road, Zhengzhou, 450052, China
| | - Zhiju Wang
- Department of Physiology and Neurobiology, School of Basic Medical Sciences, Zhengzhou University, No.100 Kexuedadao Road, Zhengzhou, 450000, China
| | - Hongkun Fan
- Department of Physiology and Neurobiology, School of Basic Medical Sciences, Zhengzhou University, No.100 Kexuedadao Road, Zhengzhou, 450000, China.
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Rodríguez-López R, García-Planells J, Martínez-Matilla M, Pérez-García C, García Banacloy A, Guzmán Luján C, Zomeño Alcalá O, Belchi Navarro J, Martínez-León J, Salguero-Bodes R. Homozygous Pro1066Arg MYBPC3 Pathogenic Variant in a 26Mb Region of Homozygosity Associated with Severe Hypertrophic Cardiomyopathy in a Patient of an Apparent Non-Consanguineous Family. LIFE (BASEL, SWITZERLAND) 2022; 12:life12071035. [PMID: 35888124 PMCID: PMC9316903 DOI: 10.3390/life12071035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 06/30/2022] [Accepted: 07/05/2022] [Indexed: 11/16/2022]
Abstract
MYPBC3 and MYH7 are the most frequently mutated genes in patients with hereditary HCM. Homozygous and compound heterozygous genotypes generate the most severe phenotypes. A 35-year-old woman who was a homozygous carrier of the p.(Pro1066Arg) variant in the MYBPC3 gene, developed HCM phenocopy associated with left ventricular noncompaction and various degrees of conduction disease. Her father, a double heterozygote for this variant in MYBPC3 combined with the variant p.(Gly1931Cys) in the MYH7 gene, was affected by HCM. The variant in MYBPC3 in the heterozygosis-produced phenotype was neither in the mother nor in her only sister. Familial segregation analysis showed that the homozygous genotype p.(Pro1066Arg) was located in a region of 26 Mb loss of heterozygosity due to some consanguinity in the parents. These findings describe the pathogenicity of this variant, supporting the hypothesis of cumulative variants in cardiomyopathies, as well as the modulatory effect of the phenotype by other genes such as MYH7. Advancing HPO phenotyping promoted by the Human Phenotype Ontology, the gene-disease correlation, and vice versa, is evidence for the phenotypic heterogeneity of familial heart disease. The progressive establishment of phenotypic characteristics over time also complicates the clinical description.
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Affiliation(s)
- Raquel Rodríguez-López
- Laboratory of Molecular Genetics, Clinical Analysis Service, Consortium General University Hospital, 46014 Valencia, Spain; (C.G.L.); (O.Z.A.)
- Correspondence: ; Tel.: +34-963-131-800-437-317; Fax: +34-963-131-979
| | | | | | | | - Amor García Banacloy
- Department of Surgery, Faculty of Medicine, University of Valencia, 46010 Valencia, Spain;
| | - Carola Guzmán Luján
- Laboratory of Molecular Genetics, Clinical Analysis Service, Consortium General University Hospital, 46014 Valencia, Spain; (C.G.L.); (O.Z.A.)
| | - Otilia Zomeño Alcalá
- Laboratory of Molecular Genetics, Clinical Analysis Service, Consortium General University Hospital, 46014 Valencia, Spain; (C.G.L.); (O.Z.A.)
| | | | | | - Rafael Salguero-Bodes
- Cardiology Department and Research Institute Hospital Universitario, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain;
- Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares (CIBERCV), Carlos III Health Institute, 28029 Madrid, Spain
- Medicine Department, Faculty of Medicine, Complutense University of Madrid, 28040 Madrid, Spain
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