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16.04.2019 | Original Article | Ausgabe 5/2019

Pediatric Cardiology 5/2019

Whole-Exome Sequencing Reveals Novel Genetic Variation for Dilated Cardiomyopathy in Pediatric Chinese Patients

Pediatric Cardiology > Ausgabe 5/2019
Genyin Dai, Zhening Pu, Xueying Cheng, Jie Yin, Jun Chen, Ting Xu, Han Zhang, Zewei Li, Xuan Chen, Jinlong Chen, Yuming Qin, Shiwei Yang
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The online version of this article (https://​doi.​org/​10.​1007/​s00246-019-02096-1) contains supplementary material, which is available to authorized users.
Genyin Dai, Zhening Pu, and Xueying Cheng are equally contributed to this work.

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Dilated cardiomyopathy (DCM) is characterized by left or bilateral ventricular dilation and systolic dysfunction without rational conditions, which can lead to progressive heart failure and sudden cardiac death. Most of the pathogenic genes have been reported in adult population by locus mapping in familial cases and animal model studies. However, it still remains challenging to decipher the role of genetics in the etiology of pediatric DCM. We applied whole-exome sequencing (WES) for 30 sporadic pediatric DCM subjects and 100 non-DCM local controls. We identified the pathogenic mutations using bioinformatics tools based on genomic strategies synergistically and confirmed mutations by Sanger sequencing. We identified compound heterozygous nonsense mutations in DSP (c.3799C > T, p.R1267X; c.4444G > T, p.E1482X). In sporadic cases, the two heterozygous mutations in XIRP2 were identified. Then we performed an exome-wide association study with 30 case and 100 control subjects. Interestingly, we could not identify TTN truncating variants in all cases. Collectively, we observed a significant risk signal between carriers of TTN deleterious missense variants and DCM risk (odds ratio 4.0, 95% confidence interval 1.1–22.2, p = 3.12 × 10−2). Our observations expanded the spectrum of mutations and were valuable in the pre- and postnatal screening and genetic diagnosis for DCM.

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