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High specificity primers, amplification methods and kits

  • US 6,365,729 B1
  • Filed: 07/12/2001
  • Issued: 04/02/2002
  • Est. Priority Date: 05/24/1999
  • Status: Expired due to Term
First Claim
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1. A hairpin oligonucleotide primer for extension by a DNA polymerase comprising a 3′

  • arm sequence, a 5′

    arm sequence and a single-stranded loop sequence separating said arm sequences, said 3′

    arm sequence and said loop sequence both being perfectly complementary to a selected priming region of a target nucleic acid strand, and said arm sequences having sufficient complementarily to one another to form a double-stranded stem hybrid in the absence of the target strand, wherein said primer hybridizes to said target strand, overcoming the stem hybrid, wherein said stem hybrid is sufficiently strong that hybridization of the loop sequence to a sequence of the length of the loop and perfectly complementary to the loop sequence does not cause dissociation of the stem, and wherein said 3′

    arm sequence contains insufficient nucleotides that are not complementary to said 5′

    arm sequence to nucleate hybridization of the primer to the target.

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