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Temporal genomics of vein bypass grafting through oligonucleotide microarray analysis
Jeffrey A Kalish1, David J Willis, Cheng Li
1Department of Surgery, Division of Vascular Surgery, Beth Israel Deacones Medical Center, Boston, MA 02115, USA. jkalish@bidmc.harvard.edu
Journal of Vascular Surgery
|February 26, 2004
Summary
This study used microarray analysis to identify gene expression changes in vein grafts over time. Findings reveal temporal gene alterations crucial for understanding vein graft remodeling and intimal hyperplasia.
Area of Science:
- Vascular surgery
- Molecular biology
- Genomics
Background:
- Autologous veins are preferred for small artery reconstruction.
- Vein grafts undergo significant remodeling post-implantation.
- Understanding gene expression changes is key to improving graft outcomes.
Purpose of the Study:
- To identify temporal gene expression patterns in canine vein grafts compared to control veins.
- To analyze differential gene expression using microarray analysis.
- To validate findings with quantitative reverse transcriptase polymerase chain reaction (qRT-PCR) and immunohistochemistry.
Main Methods:
- Cephalic vein grafts in canines were harvested at 1, 7, 14, and 30 days post-implantation.
- Microarray analysis (Affymetrix U133A GeneChips) assessed gene expression of approximately 15,000 genes.
- Statistical analysis, qRT-PCR, and immunohistochemistry were employed for data analysis and validation.
Main Results:
- 49 genes were consistently upregulated and 31 genes downregulated across time points.
- Microarray data was validated using qRT-PCR for mRNA and immunohistochemistry for protein expression.
- Hierarchical clustering identified additional genes with similar temporal or functional patterns.
Conclusions:
- This study is the first to employ microarray analysis with qRT-PCR validation to identify gene alterations in vein grafts.
- Oligonucleotide microarrays and hierarchical clustering are effective tools for generating research hypotheses.
- Identifying the temporal sequence of gene expression offers insights into vein graft remodeling and intimal hyperplasia pathways.