Abstract:
:Dilated cardiomyopathy (DCM) is the most prevalent form of primary cardiomyopathy in humans and is a leading cause of heart failure and sudden cardiac death. Genetic abnormalities have been demonstrated to be a major contributor to the development of DCM. However, DCM is a genetically heterogeneous disease, and the genetic basis underlying DCM in a significant proportion of patients remains unclear. In the current study, the coding exons and splicing junction sites of the T‑Box 20 (TBX20) gene, which encodes a T‑box transcription factor essential for cardiac morphogenesis and structural remodeling, were sequenced in 115 unrelated patients with idiopathic DCM, and a novel heterozygous mutation, p.E143X, was identified in one patient. Genetic analysis of the mutation carrier's pedigree indicated that the nonsense mutation was present in all the living family members with DCM, and also in a female patient with a congenital atrial septal defect. The mutation, which was predicted to generate a truncated protein with only the N‑terminus and a fraction of the T‑box domain remaining, was absent in 800 control chromosomes. Functional assays using a dual‑luciferase reporter assay system revealed that the truncated TBX20 protein had no transcriptional activity in contrast to its wild‑type counterpart. Furthermore, the mutation abolished the synergistic activation between TBX20 and NK2 homeobox 5, or between TBX20 and GATA binding protein 4. The observations of the current study expand the mutation spectrum of TBX20 associated with DCM and congenital heart disease (CHD), which provide novel insight into the molecular mechanisms underlying DCM and CHD, suggesting the potential implications for the effective and personalized treatment of these diseases.
journal_name
Mol Med Repjournal_title
Molecular medicine reportsauthors
Zhou YM,Dai XY,Huang RT,Xue S,Xu YJ,Qiu XB,Yang YQdoi
10.3892/mmr.2016.5609subject
Has Abstractpub_date
2016-10-01 00:00:00pages
3307-14issue
4eissn
1791-2997issn
1791-3004journal_volume
14pub_type
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