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Targeted panel sequencing in pediatric primary cardiomyopathy supports a critical role of TNNI3

  • The underlying genetic mechanisms and early pathological events of children with primary cardiomyopathy (CMP) are insufficiently characterized. In this study, we aimed to characterize the mutational spectrum of primary CMP in a large cohort of patients ≤18 years referred to a tertiary center. Eighty unrelated index patients with pediatric primary CMP underwent genetic testing with a panel-based next-generation sequencing approach of 89 genes. At least one pathogenic or probably pathogenic variant was identified in 30/80 (38%) index patients. In all CMP subgroups, patients carried most frequently variants of interest in sarcomere genes suggesting them as a major contributor in pediatric primary CMP. In MYH7, MYBPC3, and TNNI3, we identified 18 pathogenic/probably pathogenic variants (MYH7 n = 7, MYBPC3 n = 6, TNNI3 n = 5, including one homozygous (TNNI3 c.24+2T>A) truncating variant. Protein and transcript level analysis on heart biopsies from individuals with homozygous mutation of TNNI3 revealed that the TNNI3 protein is absent and associated with upregulation of the fetal isoform TNNI1. The present study further supports the clinical importance of sarcomeric mutation-not only in adult-but also in pediatric primary CMP. TNNI3 is the third most important disease gene in this cohort and complete loss of TNNI3 leads to severe pediatric CMP.

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Author:Jirko Kühnisch, Christopher Herbst, Nadya Al-Wakeel-Marquard, Josephine Dartsch, Manuel Holtgrewe, Anwar Baban, Giulia Mearini, Juliane Hardt, Konstantinos Kolokotronis, Brenda Gerull, Lucie Carrier, Dieter Beule, Stephan Schubert, Daniel Messroghli, Franziska Degener, Felix Berger, Sabine Klaassen
DOI original:https://doi.org/10.1111/cge.13645
Parent Title (English):Clinical genetics
Document Type:Article
Year of Completion:2019
Publishing Institution:Hochschule Hannover
Release Date:2020/10/26
Tag:TNNI3; cardiomyopathy; genetics; pediatrics; sarcomere
GND Keyword:Herzmuskelkrankheit; Kinderheilkunde; Genetik
First Page:549
Last Page:559
Link to catalogue:1757582754
Institutes:Fakultät III - Medien, Information und Design
DDC classes:610 Medizin, Gesundheit
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International