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Diagnostic and amplification methods using primers having thymine at 3' end to overcome primer-target mismatch at the 3' end

  • US 5,196,305 A
  • Filed: 09/12/1989
  • Issued: 03/23/1993
  • Est. Priority Date: 09/12/1989
  • Status: Expired due to Term
First Claim
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1. A method for amplifying at least one nucleic acid, said method comprising:

  • A. contacting a specimen comprising a nucleic acid with a primer composition,said primer composition consisting essentially of a primer which is complementary to a sequence of said nucleic acid in every position of said sequence except a single position at the 3'"'"' end of said primer, resulting in a single mismatch at said single position between said primer and said nucleic acid sequence,said primer having a nucleotide with a thymine base in the position of said mismatch, andB. substantially simultaneously, contacting said specimen with a DNA polymerase under conditions such that said nucleic acid is amplified in the resulting mixture by forming primer extension products, and denaturation of said primer extension products, said product formation and denaturation being carried out at least five times.

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