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 comprising:

• a) contacting a plurality of the nucleic acids with (i) at least four different dideoxynucleotide analogues, each having the structure:
• wherein F is a fluorophore, L is a cleavable linker, the base is adenine, guanine, cytosine, uracil or thymine, wherein the fluorophore attached through the cleavable 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 dideoxynucleotide analogues differs from the remaining three dideoxynucleotide analogues by having a different base, (ii) at least four deoxynucleotide 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 deoxynucleotide analogues differs from the remaining three deoxynucleotide analogues by having a different base, (iii) a nucleic acid polymerase and (iv) a plurality of nucleic acid primers which can each hybridize with a nucleic acid of the plurality of nucleic acids,
• under conditions permitting (a) one of the four dideoxynucleotide 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 nucleic acid primers and thereby extend the 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 nucleic acid primers and thereby extend that primer;
• b) identifying the fluorophore of the dideoxynucleotide analogue which has formed the phosphodiester bond, thereby identifying the consecutive nucleotide;
• c) cleaving the cleavable linker attaching the fluorophore of the dideoxynucleotide analogue which has formed the phosphodiester bond and cleaving the cleavable chemical group from the deoxynucleotide analogue which has formed the phosphodiester bond;
• d) iteratively repeating steps a) through c) for each of the consecutive nucleotide residues to be identified until a 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 primers so that they de-hybridize from the plurality of nucleic acids;
• g) 1) contacting the plurality of nucleic acids from steps a) through f) with (i) at least four different deoxynucleotide triphosphate (dNTP) analogues, each comprising a base chosen from adenine, thymine, cytosine, uracil, inosine, or 5-nitroindole each differing from a deoxynucleotide triphosphate by having a cleavable chemical group attached to the 3′ O-atom of the dNTP analogue, (ii) a nucleic acid polymerase and (iii) a plurality of second nucleic acid primers which can each hybridize with a nucleic acid of the plurality of nucleic acids, under conditions permitting one of the four dNTP 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 second nucleic acid primers and thereby extend that second primer, and
• cleaving the chemical group from the 3′ O-atom of the dNTP analogue which has formed the phosphodiester bond so as to thereby permit incorporation of a further dNTP analogue into the extended second nucleic acid primer;
• or
• 2) (I) contacting the plurality of nucleic acids from steps a) through f) with (i) three different types of deoxynucleotide triphosphate, (ii) a nucleic acid polymerase and (iii) a plurality of second nucleic acid primers which can each hybridize with a nucleic acid of the plurality of nucleic acids, under conditions permitting one of the three deoxynucleotide triphosphates 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 the second nucleic acid primer, and
• (II) contacting the plurality of nucleic acids with (i) three different types of deoxynucleotide triphosphate, wherein at least one of the types of deoxynucleotide triphosphate is not used in step (I), under conditions permitting one of the three deoxynucleotide triphosphates that is complementary to the 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 further extend the second nucleic acid primer;
• or
• 3) contacting the plurality of nucleic acids from steps a) through f) with (i) three different types of deoxynucleotide triphosphates, (ii) a deoxynucleotide triphosphate analogue, differing from a deoxynucleotide triphosphate by having a cleavable chemical group attached to the 3′ O-atom of the deoxynucleotide triphosphate analogue and differing from the three different types of deoxynucleotide triphosphates by having a different base therefrom, (iii) a nucleic acid polymerase and (iv) a plurality of second nucleic acid primers which can each hybridize with a nucleic acid of the plurality of nucleic acids, under conditions permitting one of the three deoxynucleotide triphosphates or the deoxynucleotide triphosphate analogue 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 nucleic acid primer, and
• cleaving the cleavable chemical group from the 3′ O-atom group;
• h) iteratively repeating step g) until the plurality of second nucleic acid primers are extended up to and including a residue corresponding to the final consecutive nucleotide residue identified in step e);
• i) contacting the plurality of extended second primers with (i) at least four different dideoxynucleotide analogues, each having the structure:
• wherein F is a fluorophore, L is a cleavable linker, the base is adenine, guanine, cytosine, uracil or thymine, wherein the fluorophore attached through the cleavable 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 dideoxynucleotide analogues differs from the remaining three dideoxynucleotide analogues by having a different base, (ii) at least four deoxynucleotide 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 deoxynucleotide analogues differs from the remaining three deoxynucleotide analogues by having a different base, and (iii) a nucleic acid polymerase,
• under conditions permitting (a) one of the four dideoxynucleotide 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 the second primer and (b) one of the four deoxynucleotide 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;
• j) identifying the fluorophore of the dideoxynucleotide analogue which has formed the phosphodiester bond, thereby identifying the consecutive nucleotide;
• k) cleaving the linker attaching the fluorophore of the dideoxynucleotide analogue which has formed the phosphodiester bond and cleaving the cleavable chemical group from the dNTP which has formed the phosphodiester bond;
• l) iteratively repeating steps i) through k) for each of the consecutive nucleotide residues to be identified until the final consecutive nucleotide residue is to be identified;
• m) repeating steps i) and j) 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.