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Subtractive hybridization techniques for identifying differentially expressed and commonly expressed nucleic acid

  • US 5,935,788 A
  • Filed: 07/24/1997
  • Issued: 08/10/1999
  • Est. Priority Date: 06/25/1996
  • Status: Expired due to Fees
First Claim
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1. A method for detecting a target nucleic acid present in a first nucleic acid population (a first nucleic acid sample) and not in a second nucleic acid population (a second nucleic acid sample), said method comprising:

  • (a) separately fragmenting nucleic acid from said first nucleic acid sample and nucleic acid from said second nucleic acid sample with a sample fragmenting restriction endonuclease to create first nucleic acid sample fragments and second nucleic acid sample fragments, respectively;

    (b) ligating a pair of first nucleic acid adaptors onto said first nucleic acid sample fragments, each adaptor having a first restriction endonuclease recognition site that is cleaved by a first restriction endonuclease, and amplifying said first nucleic acid sample fragments with a primer having a sequence that is complementary to a sequence of said first nucleic acid adaptors;

    (c) ligating a pair of second nucleic acid adaptors onto said second nucleic acid sample fragments, each adaptor having a second restriction endonuclease recognition site which is cleaved by a second restriction endonuclease that recognizes all or a part of said first restriction endonuclease recognition site, but cleaves so that different ends are created between said first nucleic acid sample fragments and said second nucleic acid sample fragments, and amplifying said second nucleic acid sample fragments with a primer having a sequence that is complementary to a sequence of the second nucleic acid adaptors;

    (d) fragmenting said first nucleic acid sample fragments with said first restriction endonuclease and said second nucleic acid sample fragments with said second restriction endonuclease;

    then(e) combining said first nucleic acid sample fragments and said second nucleic acid sample fragments under hybridization conditions to form a hybridization mixture; and

    (f) isolating a homoduplex from said hybridization mixture, wherein the isolation of said homoduplex identifies target nucleic acid which is present in said first nucleic acid sample and not in said second nucleic acid sample.

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