Method of sequencing DNA based on the detection of the release of pyrophosphate and enzymatic nucleotide degradation
First Claim
1. A method of identifying a base at a target position in a sample DNA sequence comprising providing a sample DNA sequence and an extension primer, which hybridizes to the sample DNA immediately adjacent to the target position and subjecting the sample DNA and extension primer to a polymerase reaction in the presence of a deoxynucleotide or dideoxynucleotide whereby the deoxynucleotide or dideoxynucleotide will only become incorporated and release pyrophosphate (PPi) if it is complementary to the base in the target position, and detecting any release of PPi enzymically, different deoxynucleotides or dideoxynucleotides being added either to separate aliquots of sample-primer mixture or successively to the sample-primer mixture and subjected to the polymerase reaction to indicate which deoxynucleotide or dideoxynucleotide is incorporated, wherein a nucleotide-degrading enzyme is included during the polymerase reaction step, such that unincorporated nucleotides are degraded, and whereby any release of PPi is indicative of incorporation of deoxynucleotide or dideoxynucleotide and the identification of a base complementary thereto.
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Abstract
The present invention relates to a method of sequencing DNA, based on the detection of base incorporation by the release of pyrophosphate (PPi) and simultaneous enzymatic nucleotide degradation.
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Citations
17 Claims
- 1. A method of identifying a base at a target position in a sample DNA sequence comprising providing a sample DNA sequence and an extension primer, which hybridizes to the sample DNA immediately adjacent to the target position and subjecting the sample DNA and extension primer to a polymerase reaction in the presence of a deoxynucleotide or dideoxynucleotide whereby the deoxynucleotide or dideoxynucleotide will only become incorporated and release pyrophosphate (PPi) if it is complementary to the base in the target position, and detecting any release of PPi enzymically, different deoxynucleotides or dideoxynucleotides being added either to separate aliquots of sample-primer mixture or successively to the sample-primer mixture and subjected to the polymerase reaction to indicate which deoxynucleotide or dideoxynucleotide is incorporated, wherein a nucleotide-degrading enzyme is included during the polymerase reaction step, such that unincorporated nucleotides are degraded, and whereby any release of PPi is indicative of incorporation of deoxynucleotide or dideoxynucleotide and the identification of a base complementary thereto.
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17. A method of identifying a base at a target position in a sample DNA sequence comprising arranging a multiplicity of DNA sequences in array format on a solid surface, providing to each sample an extension primer, which hybridizes to the sample DNA immediately adjacent to the target position and subjecting the sample DNA and extension primer to a polymerase reaction in the presence of a deoxynucleotide or dideoxynucleotide whereby the deoxynucleotide or dideoxynucleotide will only become incorporated and release pyrophosphate (PPi) if it is complementary to the base in the target position and detecting any release of PPi enzymically, different deoxynucleotides or dideoxynucleotides being added either to separate aliquots of sample-primer mixture or successively to the same sample-primer mixture and subjected to the polymerase reaction to indicate which deoxynucleotide or dideoxynucleotide is incorporated whereby a nucleotide-degrading enzyme is included during the polymerase reaction step such that unincorporated nucleotides are degraded, and whereby any release of PPi is indicative of incorporation of deoxynucleotide or dideoxynucleotide and the identification of a base complementary thereto.
Specification