| 摘 要： | Objective To explore the mutational loci associated with the occurrence of dilated cardiomyopathy (DCM). Methods Six children with DCM and 3 healthy children were recruited through the " Children DCM Susceptibility Gene Research Project" for a prospective study from December 2019 to June 2021. Six patients were aged from 4 months to 14 years, including 5 girls and 1 boy. Three healthy children were aged between 3-13 years, including 2 girls and 1 boy. Whole exome sequencing was performed on the research subjects, and the pathogenic genes were identified by bioinformatics methods. At the same time, the venous blood of the first - degree relatives of the corresponding children was collected, and the region with gene mutations was subjected to next - generation sequencing. Results A total of 4 mutational loci that might be related to DCM were identified. Case 1 was found to have a c. 2011-3C > G mutation in the jounctophiilin - 2 (JPH2) gene. The c. 2011-3 C > G mutation was homozygous (GG) in the child, but heterozygous (CG) in the parents. This child also had a c. G49415A mutation in the titin (TTN) gene. This c. G49415A mutation was homozygous (AA) in the child, but heterozygous (GA) in the parents. Case 4 was found to have a c. G23033A mutation in the TTN gene. The c. G23033A mutation was heterozygous (GA) in both the subject and the father, but a wild type (GG) in the mother. Case 5 was found to have a c. 16975_16978del mutation in the TTN gene. The c. 16975_16978del mutation was heterozygous (TCTTC/T) in the child and the father, but a wild type (TCTTC/TCTTC) in the mother. Conclusions A total of 4 pathogenic gene loci related to the pathogenesis of DCM are identified in this study. The finding enriches the DCM disease gene spectrum and provides targets for the implementation of precision medicine. © 2022 ＣｈｉｎＪＡｐｐｌＣｌｉｎＰｅｄｉａｔ. All rights reserved.
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