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Improved subtractive suppression hybridization combined with high density cDNA array screening identifies
Csaba Kiss1, Jun Nishikawa, Andreas Dieckmann
1Microbiology and Tumor Biology Center (MTC), Karolinska Institute, Nobels vag 16, S-17177, Stockholm, Sweden.
Journal of Virological Methods
|December 31, 2002
Summary
This study improved suppression subtractive hybridization (SSH) for isolating differentially expressed genes. The enhanced method identified several Epstein-Barr virus (EBV) genes in a Burkitt
Area of Science:
- Molecular Biology
- Genomics
- Cancer Research
Background:
- Suppression subtractive hybridization (SSH) is a technique for identifying differentially expressed genes.
- The efficiency of SSH relies on restriction enzyme digestion and adapter ligation.
- Improving SSH efficiency is crucial for accurate gene expression analysis.
Purpose of the Study:
- To enhance the efficiency of the suppression subtractive hybridization (SSH) protocol.
- To identify differentially expressed genes between EBV-infected and EBV-negative Akata(-) Burkitt's lymphoma cell lines.
- To optimize cDNA array hybridization for quantitative gene expression analysis.
Main Methods:
- Modified SSH protocol incorporating magnetic bead-based separation after adapter ligation.
- Comparison of EBV(NEO) infected Akata(-) Burkitt's lymphoma cells with EBV(-) Akata(-) cells.
- Sequencing of 44 differentially expressed cDNA clones and optimization of high-density nylon cDNA array hybridization.
Main Results:
- The modified SSH protocol successfully isolated differentially expressed genes.
- Sequencing identified 44 unique cDNA clones, with 20 showing >3-fold expression difference.
- Seven of the 20 highly differentially expressed genes were identified as EBV genes.
- Optimized cDNA array hybridization demonstrated reproducible spotting for parallel filter comparisons.
Conclusions:
- The improved SSH protocol enhances subtraction efficiency.
- This method effectively identifies differentially expressed genes, including viral genes.
- Optimized array hybridization provides a reliable platform for quantitative gene expression studies.