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Role of cardiac TBX20 in dilated cardiomyopathy

Anupam Mittal1, Rajni Sharma2, Rishikesh Prasad2

  • 1Department of Cardiology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.

Molecular and Cellular Biochemistry
|February 20, 2016
PubMed

Insights

Transcription factor TBX20 is elevated in dilated cardiomyopathy (DCM) patients and an animal model, correlating with impaired heart function. This suggests TBX20 plays a role in DCM development.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Genetics

Background:

  • Dilated cardiomyopathy (DCM) is a major cause of heart failure and sudden cardiac death globally.
  • The transcription factor TBX20 is vital for cardiac development and adult heart maintenance.
  • Emerging evidence suggests TBX20 involvement in the mechanisms underlying DCM.

Purpose of the Study:

  • To investigate TBX20 expression levels in idiopathic DCM patients and an experimental rat model.
  • To assess the correlation between TBX20 expression and left ventricular (LV) function indices.
  • To explore the potential roles of DNA promoter methylation and copy number variations (CNVs) in regulating TBX20 expression in DCM.

Main Methods:

  • Endomyocardial biopsies (EMBs) were collected from idiopathic DCM patients (n=30) and control subjects with ventricular septal defect (VSD, n=14).
  • A rat model of DCM was induced via right renal artery ligation (RAL).
  • Cardiac TBX20 mRNA levels were quantified using real-time PCR; DNA methylation and CNVs were also analyzed.

Main Results:

  • Cardiac TBX20 mRNA levels were significantly elevated (8.9-fold, p < 0.001) in IDCM patients and RAL rats compared to controls.
  • TBX20 expression demonstrated a significant negative correlation with left ventricular ejection fraction (LVEF) (r = -0.71, p < 0.001).
  • A positive correlation was found between TBX20 expression and left ventricular end-systolic volume (r = 0.39, p = 0.038); no significant differences in TBX20 CNVs or promoter methylation were observed.

Conclusions:

  • The study indicates significantly increased cardiac TBX20 mRNA levels in both human DCM and an experimental model.
  • Elevated TBX20 expression is associated with impaired LV function, specifically reduced LVEF and increased LV end-systolic volume.
  • These findings suggest a potential role for TBX20 in the pathophysiology of dilated cardiomyopathy, independent of promoter methylation or CNVs.
Keywords:
Dilated cardiomyopathyHeart failureLVEF and gene expressionTBX20

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