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Isolation of Atrial Myocytes from Adult Mice
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Ischemic Heart Disease Selectively Modifies the Right Atrial Appendage Transcriptome.

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  • 1Department of Pharmacology, Faculty of Medicine, University of Helsinki, Helsinki, Finland.

Frontiers in Cardiovascular Medicine
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Researchers identified specific RNA molecules in the heart

Keywords:
atrial appendagebiomarkerscardiovascular surgerychronic ischemic heart diseasedifferentially expressed genesischemia

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Area of Science:

  • Cardiovascular Biology
  • Molecular Cardiology
  • Genomics

Background:

  • Ischemic heart disease (IHD) diagnosis and severity assessment are often delayed.
  • Molecular alterations in the ischemic myocardium are not well understood.
  • Current diagnostic methods rely on clinical symptoms, imaging, and risk factors.

Purpose of the Study:

  • To identify signature RNAs in the atrial myocardium associated with IHD.
  • To evaluate the potential of these RNAs as biomarkers for disease severity and treatment outcomes.
  • To gain insight into IHD molecular mechanisms.

Main Methods:

  • Collected right atrial appendage (RAA) biopsies from IHD patients and non-IHD controls.
  • Performed RNA sequencing on RAA tissue.
  • Analyzed transcriptomes against healthy donor data (GTEx project).

Main Results:

  • IHD transcriptomes showed repressed RNA expression in cell-cell contacts and mitochondrial dysfunction pathways.
  • Specific genes (CSRNP3, FUT10, SHD, NAV2-AS4, hsa-mir-181) were significantly associated with coronary artery obstruction complexity.
  • These gene expression changes correlated with improved cardiac function after bypass surgery.

Conclusions:

  • Identified IHD-associated signature RNAs from the atrial myocardium.
  • These findings offer a molecular perspective on IHD pathogenesis.
  • Potential for developing novel biomarkers for early IHD detection and treatment.