DNA sequencing with non-fluorescent nucleotide reversible terminators and cleavable label modified nucleotide terminators

A method for determining the identity of each of a series of consecutive nucleotide residues in a nucleic acid template comprising:

• a) contacting a plurality of the nucleic acids with (i) at least four different dideoxynucleotide triphosphate (ddNTP) analogues, each having the structure:
• wherein F is a fluorophore, Base is a base which is adenine, guanine, cytosine, uracil or thymine, wherein the fluorophore attached through a linker to each type of base differs in its emission or excitation spectra from a fluorophore attached to each of the remaining types of bases, and each of the four ddNTP analogues differs from the remaining three ddNTP analogues by having a different base, wherein L is a cleavable linker molecule,
• (ii) at least four deoxynucleotide triphosphate (dNTP) analogues having the structure:
• wherein B is a base and is adenine, guanine, cytosine, uracil, or thymine, and wherein R′ is a cleavable chemical group, wherein each of the four dNTP analogues differs from the remaining three dNTP analogues by having a different base,
• (iii) a nucleic acid polymerase and
• (iv) a plurality of a first nucleic acid primer which can each hybridize with a separate one of each of the plurality of nucleic acids,
• under conditions permitting (A) one of the four ddNTP analogues that is complementary to the consecutive nucleotide residue to be identified to form a phosphodiester bond with the 3′ end of one of the first nucleic acid primers and thereby extend that primer and (B) one of the four dNTP analogues that is complementary to a consecutive nucleotide residue to be identified to form a phosphodiester bond with the 3′ end of another one of the first nucleic acid primers and thereby extend that primer;
• b) identifying the fluorophore of the ddNTP analogue which has formed the phosphodiester bond, thereby identifying the consecutive nucleotide;
• c) cleaving the linker attaching the fluorophore of the ddNTP analogue which has formed the phosphodiester bond and cleaving the cleavable chemical group from the dNTP which has formed the phosphodiester bond;
• d) iteratively repeating steps a) through c) for each of the consecutive nucleotide residues to be identified until the final consecutive nucleotide residue is to be identified;
• e) repeating steps a) and b) to identify the final consecutive nucleotide residue,
• f) denaturing the extended first nucleic acid primers so that they de-hybridize them from the plurality of nucleic acid templates;
• g) contacting the plurality of nucleic acids with (i) three different types of deoxynucleotide triphosphates (dNTPs), (ii) a nucleic acid polymerase and (iii) a first substrate of the polymerase, wherein the substrate can be recognized but not incorporated into the growing DNA strand by the polymerase, wherein the substrate is complementary to a nucleotide residue that is different from each of the nucleotide residues that the three dNTPs are complementary to, respectively, and (iv) a plurality of a second nucleic acid primer which can each hybridize with a separate one of the plurality of nucleic acid templates, under conditions permitting one of the three dNTP that is complementary to the consecutive nucleotide residue to be identified to form a phosphodiester bond with the 3′ end of one of the second nucleic acid primers and thereby extend that second primer;
• h) contacting the plurality of the nucleic acid template with (i) three different types of deoxynucleotide triphosphates, wherein at least one type of the deoxynucleotide triphosphates is not used in step g), and (ii) a second substrate of the polymerase, wherein the substrate can be recognized but not incorporated to the growing DNA strand by the polymerase, wherein the substrate is complementary to a nucleotide residue that is different from each of the nucleotide residues that the three dNTPs are complementary to, respectively, under conditions permitting one of the three dNTPs that is complementary to the consecutive nucleotide residue to be identified to form a phosphodiester bond with the 3′ end of one of the plurality of the extended second nucleic acid primer and thereby extend that primer;
• i) iteratively repeating steps g) and h) until the second nucleic acid primer is extended up to and including a residue corresponding to the final consecutive nucleotide residue identified in step e);
• j) contacting the plurality of extended second nucleic acid primers with (i) at least four different dideoxynucleotide triphosphate (ddNTP) analogues, each having the structure:
• wherein F is a fluorophore, Base is a base which is adenine, guanine, cytosine, uracil or thymine, wherein the fluorophore attached through a linker to each type of base differs in its emission or excitation spectra from a fluorophore attached to each of the remaining types of bases, and each of the four ddNTP analogues differs from the remaining three ddNTP analogues by having a different base, wherein L is a cleavable linker molecule,
• (ii) at least four deoxynucleotide triphosphate (dNTP) analogues having the structure:
• wherein B is a base and is adenine, guanine, cytosine, uracil, or thymine, and wherein R′ is a cleavable chemical group, wherein each of the four dNTP analogues differs from the remaining three dNTP analogues by having a different base, and
• (iii) a nucleic acid polymerase,
• under conditions permitting (A) one of the four ddNTP analogues that is complementary to the next consecutive nucleotide residue to be identified to form a phosphodiester bond with the 3′ end of one of the extended second nucleic acid primers and thereby extend that second nucleic acid primer and (B) one of the four dNTP analogues that is complementary to a consecutive nucleotide residue to be identified to form a phosphodiester bond with the 3′ end of another one of the extended second nucleic acid primers and thereby extend that second primer;
• k) identifying the fluorophore of the ddNTP analogue which has formed the phosphodiester bond, thereby identifying the consecutive nucleotide;
• l) cleaving the linker attaching the fluorophore of the ddNTP analogue which has formed the phosphodiester bond and cleaving the cleavable chemical group from the dNTP which has formed the phosphodiester bond;
• m) iteratively repeating steps j) through l) for each of the consecutive nucleotide residues to be identified until the final consecutive nucleotide residue is to be identified;
• n) repeating steps j) and k) to identify the final consecutive nucleotide residue,
• so as to thereby determine the identity of each of the series of consecutive nucleotide residues in the nucleic acid.