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Functional profiling of human atrial and ventricular gene expression
Andreas S Barth1, Sylvia Merk, Elisabeth Arnoldi
1Department of Medicine I, University Hospital Grosshadern, Ludwig-Maximilians-University, Marchioninistrasse 15, 81377, Munich, Germany. andreas.barth@med.uni-muenchen.de
Pflugers Archiv : European Journal of Physiology
|May 7, 2005
Summary
Human heart atria and ventricles have distinct gene expression patterns. Ventricular cells prioritize contraction and energy, while atrial cells focus on neurohumoral functions, revealing chamber specialization.
Area of Science:
- Cardiovascular Biology
- Molecular Cardiology
- Genomics
Background:
- Human atria and ventricles exhibit distinct ultrastructural and functional properties.
- Understanding the molecular basis of these chamber-specific differences is crucial for comprehending heart physiology and disease.
Purpose of the Study:
- To identify the transcriptional underpinnings of human atrial and ventricular specialization.
- To provide a comprehensive catalog of the human myocardial transcriptome.
Main Methods:
- Exploratory microarray analysis using the Affymetrix U133A+B platform.
- Analysis of 11,740 expressed transcripts in human heart tissue.
- Functional classification using Gene Ontology (GO) to identify chamber-specific gene expression patterns.
Main Results:
- Significant differences in gene expression were observed between atria and ventricles, with 3,300 and 2,974 transcripts showing higher expression in atria and ventricles, respectively.
- Ventricular myocytes preferentially express genes related to contractile function and energy metabolism.
- Atrial myocytes show specific transcriptional activity related to neurohumoral functions, and pathways associated with fibrosis and apoptosis are concentrated in the atria.
Conclusions:
- Transcriptional profiles reveal molecular insights into the distinct specialization of atrial and ventricular cardiomyocytes.
- These findings explain regional adaptations to physiological and pathophysiological conditions, including the higher susceptibility of atria to fibrosis and apoptosis.
- An evolutionarily conserved, chamber-specific gene expression pattern in mammalian myocardium is suggested by commonalities between human and murine transcriptomes.