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A rapid and simple PCR-based method for isolation of cDNAs from differentially expressed genes
1Department of Biochemistry and Molecular Biology, Jefferson Institute of Molecular Medicine, Jefferson Medical College, Thomas Jefferson University, Philadelphia, PA 19107.
Nucleic Acids Research
|September 25, 1994
Summary
This study introduces a simple, two-step PCR protocol to detect and isolate cDNA fragments from differentially expressed genes. This method efficiently identifies gene expression changes and aids in cloning and sequencing efforts.
Area of Science:
- Molecular Biology
- Genomics
- Gene Expression Analysis
Background:
- Previous methods for detecting differentially expressed mRNAs involved arbitrarily primed reverse transcription PCR (RT-PCR).
- These techniques focused on amplifying cDNA fragments from specific mRNA subsets.
Purpose of the Study:
- To develop a simple, rapid, and efficient PCR-based protocol for detecting and isolating cDNA fragments from differentially expressed genes.
- To enable direct use of amplified fragments for cloning, sequencing, and Northern blot analysis.
Main Methods:
- A two-step protocol involving reverse transcription with a degenerated 6-mer oligonucleotide primer.
- PCR amplification of internal cDNA regions using arbitrary, defined primers.
- Agarose gel electrophoresis for fragment display and subsequent excision for downstream applications.
Main Results:
- Successfully detected and isolated cDNA fragments up to 3000 base pairs.
- Obtained over 170 discrete cDNA fragments from a single tissue by repeating PCR amplification with different primer sets.
- Defined 3600 base pairs of a novel brain-specific mRNA using the developed procedure.
Conclusions:
- The described PCR protocol offers a straightforward and rapid method for identifying and isolating differentially expressed gene fragments.
- The technique facilitates subsequent molecular analyses, including cloning and sequencing.
- This approach enhances the study of gene expression and the characterization of novel transcripts.