Related Experiment Videos
Global gene expression profiling of end-stage dilated cardiomyopathy using a human cardiovascular-based cDNA
J David Barrans1, Paul D Allen, Dimitrios Stamatiou
1Cardiovascular Genome Unit, the Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.
The American Journal of Pathology
|June 12, 2002
Summary
This study reveals key gene expression changes in dilated cardiomyopathy (DCM) heart failure. Researchers identified over 100 differentially expressed transcripts, including novel cardiac-enriched genes, offering a molecular profile of DCM.
Area of Science:
- Cardiovascular Biology
- Molecular Genetics
- Genomics
Background:
- End-stage heart failure, specifically dilated cardiomyopathy (DCM), presents a significant clinical challenge.
- Understanding the molecular underpinnings of DCM is crucial for developing targeted therapies.
Purpose of the Study:
- To generate a comprehensive genomic profile of end-stage dilated cardiomyopathy (DCM).
- To identify differentially expressed genes in failing human hearts compared to non-failing controls.
Main Methods:
- Utilized a custom-built human cardiovascular cDNA microarray (CardioChip) with 10,848 elements.
- Performed gene expression analysis on RNA extracted from left ventricular free walls of DCM patients and non-failing hearts.
- Employed quantitative real-time reverse transcriptase-polymerase chain reaction (qRT-PCR) for verification.
Main Results:
- Identified over 100 transcripts consistently differentially expressed in DCM hearts ( >1.5-fold change, P < 0.05).
- Observed significant up-regulation of atrial natriuretic peptide, sarcomeric proteins, cytoskeletal proteins, stress response proteins, and transcription/translation regulators.
- Noted down-regulation of cell-signaling mediators, particularly those in calcium (Ca2+) pathways.
- Discovered co-expression of several novel, cardiac-enriched expressed sequence tags.
Conclusions:
- Provides a preliminary molecular portrait of dilated cardiomyopathy using a large, heart-specific microarray.
- Highlights the potential of novel cardiac-enriched transcripts for future research in heart failure.
- Suggests dysregulation of calcium signaling pathways as a key feature in DCM pathogenesis.