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Machine learning modeling identifies hypertrophic cardiomyopathy subtypes with genetic signature

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Abstract

Previous studies have revealed that patients with hypertrophic cardiomyopathy (HCM) exhibit differences in symptom severity and prognosis, indicating potential HCM subtypes among these patients. Here, 793 patients with HCM were recruited at an average follow-up of 32.78 ± 27.58 months to identify potential HCM subtypes by performing consensus clustering on the basis of their echocardiography features. Furthermore, we proposed a systematic method for illustrating the relationship between the phenotype and genotype of each HCM subtype by using machine learning modeling and interactome network detection techniques based on whole-exome sequencing data. Another independent cohort that consisted of 414 patients with HCM was recruited to replicate the findings. Consequently, two subtypes characterized by different clinical outcomes were identified in HCM. Patients with subtype 2 presented asymmetric septal hypertrophy associated with a stable course, while those with subtype 1 displayed left ventricular systolic dysfunction and aggressive progression. Machine learning modeling based on personal whole-exome data identified 46 genes with mutation burden that could accurately predict subtype propensities. Furthermore, the patients in another cohort predicted as subtype 1 by the 46-gene model presented increased left ventricular end-diastolic diameter and reduced left ventricular ejection fraction. By employing echocardiography and genetic screening for the 46 genes, HCM can be classified into two subtypes with distinct clinical outcomes.

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Acknowledgements

We gratefully acknowledge all the participants and funding sources. This study was funded by the National Key R&D Program of China (No. 2017YFC0909400), the National Natural Science Foundation of China (Nos. 91439203, 91839302, and 81700413), Shanghai Municipal Science and Technology Major Project (No. 2017SHZDZX01), and the Fundamental Research Funds for the Central Universities, HUST (No. 2016JCTD117).

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Correspondence to Zhongsheng Sun or Dao Wen Wang.

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Jiaqi Dai, Tao Wang, Ke Xu, Yang Sun, Zongzhe Li, Peng Chen, Hong Wang, Dongyang Wu, Yanghui Chen, Lei Xiao, Hao Liu, Haoran Wei, Rui Li, Liyuan Peng, Ting Yu, Yan Wang, Zhongsheng Sun, and Dao Wen Wang declare no conflict of interest. All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000. Informed consent was obtained from all the patients for being included in the study.

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Dai, J., Wang, T., Xu, K. et al. Machine learning modeling identifies hypertrophic cardiomyopathy subtypes with genetic signature. Front. Med. 17, 768–780 (2023). https://doi.org/10.1007/s11684-023-0982-1

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