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Method for the uncoupled, direct, exponential amplification and sequence of DNA molecules with the addition of a second thermostable DNA polymerase and its application

  • US 6,225,092 B1
  • Filed: 12/16/1997
  • Issued: 05/01/2001
  • Est. Priority Date: 12/20/1996
  • Status: Expired due to Fees
First Claim
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1. A method for sequencing at least a portion of a nucleic acid molecule involving simultaneously amplifying the nucleic acid molecule and generating full length and truncated copies of the nucleic acid molecule for sequencing, comprising the steps of(a) subjecting a mixture in a single step to DNA amplification and generation of full length and truncated copies by subjecting the mixture to a thermocycling reaction, the thermocycling reaction comprises heat denaturation, annealing and synthesis, wherein said mixture comprises said nucleic acid molecule, a buffer solution, a first primer which is able to hybridize with a strand of said nucleic acid molecule, a second primer which is able to hybridize with a strand of said nucleic acid molecule complementary to the strand with which the first primer is able to hybridize, wherein at least one of the first and second primers is labelled, deoxynucleotides or deoxynucleotide derivatives, wherein said deoxynucleotide derivatives are able to be incorporated by a thermostable DNA polymerase into growing DNA molecules in place of one of dATP, dGTP, dTTP or dCTP, at least one dideoxynucleotide or another terminating nucleotide, and at least two thermostable DNA polymerases, wherein said at least two thermostable DNA polymerases are at least a first thermostable DNA polymerase and a second thermostable DNA polymerase, which second thermostable DNA polymerase has a reduced ability to incorporate said dideoxynucleotide or another terminating nucleotide compared with said first thermostable DNA polymerase, wherein a ratio of the amount, in unit, of said second thermostable DNA polymerase to the amount, in unit, of said first thermostable DNA polymerase is 1:

  • X, wherein X is at least 16, to generate full-length and truncated copies of said nucleic acid molecule, wherein the full-length copies have a length equal to that of at least a portion of said nucleic acid molecule spanning the binding sites of the first and second primers;

    (b) making a sequence ladder using at least said truncated copies; and

    thereafter (c) reading the sequence ladder to obtain the sequence of said at least a portion of said nucleic acid molecule.

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