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Expression profiling of human idiopathic dilated cardiomyopathy
Rafal Grzeskowiak1, Henning Witt, Mario Drungowski
1Max-Planck Institute for Molecular Genetics, Ihnestr. 73, 14195 Berlin, Germany.
Cardiovascular Research
|August 12, 2003
Summary
This study reveals global gene expression changes in dilated cardiomyopathy (DCM) patients, identifying novel DCM-associated transcripts involved in heart muscle function and signaling pathways. Findings offer insights into DCM pathophysiology and potential early disease markers.
Area of Science:
- Cardiovascular Biology
- Molecular Genetics
- Genomics
Background:
- Dilated cardiomyopathy (DCM) is a significant cause of heart failure.
- Understanding the molecular mechanisms underlying DCM is crucial for developing effective treatments.
Purpose of the Study:
- To conduct a large-scale genome-wide expression screen in human DCM patient myocardial biopsies.
- To identify and characterize deregulated genes and molecular processes associated with DCM pathophysiology.
Main Methods:
- Whole genome expression profiling using a cDNA library (30,336 clones) on myocardial biopsies from 10 DCM patients and 4 healthy donors.
- Hierarchical clustering and functional annotation of differentially expressed transcripts.
- Validation in MLP-deficient mouse models.
Main Results:
- Identified 364 differentially expressed, non-redundant transcripts with a false discovery rate <0.001.
- Discovered numerous known and novel DCM-associated transcripts, many upregulated in cardiomyocyte energetics, muscle contraction, and signaling.
- Functionally annotated and clustered 222 deregulated transcripts, providing insights into DCM pathophysiology.
Conclusions:
- This is the first genome-wide expression profile analysis of human DCM cardiac biopsies.
- Genes involved in intracellular signaling and muscle contraction may be associated with early stages of DCM.
- The study presents a comprehensive molecular portrait of human cardiomyopathy.