Nucleic Acids Research, 1995, Vol. 23, No. 15 2954-2958
© 1995
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Identification of differentialy expressed genes by restirction endonuclease-based gene expression fingerprinting
1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences Vavilov Str. 32, 117 984 Moscow, Russia 2New York Blood Center 310 East 67 Street, New York, NY 10021, USA
*To Whom correspondence should be addressed at: The Engelhardt Institute of Molecular Biology, Moscow, Russia
Received April 7, 1995. Accepted June 30, 1995.
A novel method for identification of differentially expressed genes has been developed. It is based on the consecutive restriction digestions of 3' terminal cDNA fragments to produce a fingerprint of gene expression. cDNA molecules are synthesized using a biotinylated oligo(dT) primer, digested with a frequently cutting restriction endonuclease and the 3'-terminal restriction fragments are isolated using streptavidin microbeads. After amplification by PCR, cDNA fragments are Immobilized again on streptavidin beads, radiolabeled and treated sequentially with a set of restriction endonucleases. The products of individual enzymatic reactions from two or more different RNA populations are resolved by polyacrylamide gel electrophoresis and compared to reveal differentially expressed genes. This strategy enabled us to identify and clone the fragments of five genes expressed differentially In murine thymus and spleen. One of the genes was found to encode terminal deoxynucleotidyl transferase; others are apparently previously unknown genes
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