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Cloning differentially expressed mRNAs
J S Wan1, S J Sharp, G M Poirier
1R. W. Johnson Pharmaceutical Research Institute, San Diego, CA 92121, USA.
Nature Biotechnology
|December 1, 1996
Summary
Differential gene expression analysis using electronic subtraction (ES), subtractive hybridization (SH), and differential display (DD) methods was compared. Differential display (DD) is the preferred method for identifying differentially expressed mRNAs, regardless of abundance.
Area of Science:
- Molecular Biology
- Genomics
- Gene Expression Analysis
Background:
- Differential gene expression is crucial in biological processes like development and injury.
- Current methods for identifying differentially expressed genes, such as electronic subtraction (ES), subtractive hybridization (SH), and differential display (DD), lack rigorous quantitative comparison.
- The quantitative aspects of these gene expression analysis techniques remain largely speculative.
Purpose of the Study:
- To quantitatively compare the efficacy of electronic subtraction (ES), subtractive hybridization (SH), and differential display (DD) for identifying differentially expressed mRNAs.
- To determine the optimal method for comprehensive gene expression profiling.
Main Methods:
- Comparison of three distinct methods for detecting differential gene expression: electronic subtraction (ES), subtractive hybridization (SH), and differential display (DD).
- Application of these methods to HeLa cells treated with interferon-gamma to identify differentially expressed mRNAs.
- Analysis of data generated by each method, focusing on the number of unique mRNAs identified, redundancy, and dependence on mRNA abundance or primers.
Main Results:
- Electronic subtraction (ES) identified only seven abundant mRNAs, yielding digital, reusable data but missing rare transcripts.
- Subtractive hybridization (SH) identified 33 unique mRNAs with redundancy dependent on mRNA abundance.
- Differential display (DD) identified 23 unique mRNAs, demonstrating redundancy dependent on primers, and is independent of mRNA prevalence.
Conclusions:
- Differential display (DD) is the method of choice for identifying differentially expressed mRNAs due to its ability to detect both abundant and rare transcripts.
- DD requires minimal RNA input, simultaneously detects mRNA increases and decreases, and provides rapid results.
- The study highlights DD's superiority in comprehensive gene expression analysis compared to ES and SH.