3'-oh unblocked nucleotides and nucleosides base mdified with non-cleavable, terminating groups and methods for their use in dna sequencing

Abstract

Provided are novel nucleotides, nucleoside, and their derivatives described herein, that can be used in DNA sequencing technology and other types of DNA analysis. In one embodiment, the nucleotide or nucleoside with an unprotected 3′-OH group is derivatized at the nucleobase to include a fluorescent dye attached via a linker to a non-cleavable terminating group. The non-cleavable-fluorescent group is designed to terminate DNA synthesis so that DNA oligomers can be sequenced efficiently in a parallel format. These reagents and methods will lead to more accurate identification of polymorphisms and other valuable genetic information.

1 . A compound according to the following formula or salt thereof: 
       
         
           
           
               
               
           
         
         wherein R 1  is H, monophosphate, diphosphate, triphosphate, or alpha-thio-triphosphate, 
         R 2  is H or OH, 
         base is cytosine, uracil, thymine, adenine, guanine, or a naturally occurring derivative thereof, 
         non-cleavable terminating moiety is a group imparting polymerase termination properties to the compound, 
         linker is a bifunctional group, and 
         dye is a fluorophore. 
       
     
     
         2 . The compound of  claim 1 , wherein the non-cleavable terminating moiety is attached to the base through a linkage selected from the group consisting of benzyl amine, benzyl ether, carbamate, carbonate, 2-(o-nitrophenyl)ethyl carbamate, and 2-(o-nitrophenyl)ethyl carbonate. 
     
     
         3 . A compound selected from the group of formulas or salts thereof consisting of: 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         wherein R 1 ═H, monophosphate, diphosphate, triphosphate, or alpha-thio-triphosphate, 
         R 2 ═H or OH, 
         R 3  and R 4  are each independently selected from the group consisting of H, a C 1 -C 12  straight chain or branched alkyl, a C 2 -C 12  straight chain or branched alkenyl or polyenyl, a C 2 -C 12  straight chain or branched alkynyl or polyalkynyl, and an aromatic group, 
         R 5 , R 6 , and R 7 , are each independently selected from the group H, OCH 3 , NO 2 , CN, a halide, a C 1 -C 12  straight chain or branched alkyl, a C 2 -C 12  straight chain or branched alkenyl or polyenyl, a C 2 -C 12  straight chain or branched alkynyl or polyalkynyl, and an aromatic group, and/or with the proviso that one of R 5 , R 6  and R 7  is a linker group of the general structure —C≡CCH 2 NH 2 , 
       
       
         
           
           
               
               
           
         
         wherein X═CH 2 , CH═CH, O, S, or NH, 
         Y═CH 2 , O, or NH, 
         n=an integer from 0-12; 
         m=an integer from 0-12, 
         Dye=a fluorophore, 
         and R 8  and R 9  are as defined above for R 5 , R 6 , and R 7 , with the proviso that R 8  and R 9  are not NO 2 . 
       
     
     
         4 . The compound of  claim 3 , wherein R 3  and R 4  are each independently selected from the group consisting of H, —CH 3 , —CH 2 CH 3 , —CH 2 CH 2 CH 3 , isopropyl, tert-butyl, and phenyl. 
     
     
         5 . The compound of  claim 3 , wherein R 3  and R 4  are each independently selected from the group consisting of H, alkyl and aromatic groups optionally containing at least one heteroatom in the alkyl or aromatic groups, and further wherein the aromatic group may optionally be an aryl or polycyclic group. 
     
     
         6 . The compound of  claim 3 , wherein R 5 , R 7 , R 8 , and R 9  are each H. 
     
     
         7 - 8 . (canceled) 
     
     
         9 . A method of determining the sequence of a target nucleic acid comprising
 (i) adding a target nucleic acid to a Sanger or Sanger-type sequencing apparatus,   (ii) adding one or more compounds according to  claim 1  to the sequencing apparatus, with the proviso that where more than one type of base is present, each base is attached to a different fluorophore;   (iii) adding a complementary primer and a polymerase enzyme,   (iv) performing a polymerase reaction to incorporate at least one of the compounds of step (ii) into a growing nucleic acid strand, and   (v) analyzing the result of the Sanger sequencing reaction with fluorescence sequencing instrumentation or by pulsed multiline excitation fluorescence,   wherein steps (i)-(iii) can be performed in any order.   
     
     
         10 . The method according to  claim 9 , wherein incorporation of at least one compound according to step (iv) is followed by termination of strand growth at an efficiency of from about 90% to about 100%. 
     
     
         11 . The method according to  claim 9 , wherein the incorporation of at least one compound according to step (iv) occurs at about 70% to about 100% of the efficiency of incorporation of a native substrate with the same base in the polymerase reaction. 
     
     
         12 . The method according to  claim 11 , wherein the incorporation efficiency occurs at about 85% to about 100%. 
     
     
         13 . The method according to  claim 9 , wherein the polymerase is selected from the group consisting of reverse transcriptase, terminal transferase, and DNA polymerase. 
     
     
         14 - 15 . (canceled) 
     
     
         16 . A method of incorporating a non-naturally occurring component into a nucleic acid comprising:
 (i) adding a target nucleic acid to a sequencing apparatus;   (ii) adding one or more compounds according to  claim 1  to the sequencing apparatus, with the proviso that where more than one type of base is present, each base is attached to a different fluorophore;   (iii) adding a polymerase enzyme; and   (iv) performing a polymerase reaction to incorporate at least one of the compounds of step (ii) into a growing nucleic acid strand,   wherein steps (i)-(iii) can be performed in any order.   
     
     
         17 . The method according to  claim 16 , further comprising
 (v) analyzing the result of the polymerase chain reaction for incorporation of at least one compound from step (ii).   
     
     
         18 . The method according to  claim 16 , wherein incorporation of at least one compound according to step (iv) is followed by termination of strand growth at an efficiency of from about 90% to about 100%. 
     
     
         19 . The method according to  claim 16 , wherein the incorporation of at least one compound according to step (iv) occurs at about 70% to about 100% of the efficiency of incorporation of native substrate with the same base in the polymerase reaction. 
     
     
         20 . A method of terminating nucleic acid synthesis comprising the step of placing a compound according to  claim 1  in the environment of a polymerase and allowing incorporation of the compound into a nucleic acid. 
     
     
         21 . The method according to  claim 20  wherein the efficiency of termination upon incorporation of the compound ranges from about 90% to about 100%. 
     
     
         22 . The method according to  claim 20  wherein the efficiency of incorporation of the compound ranges from about 70% to about 100% compared to the efficiency of incorporation of a naturally-occurring nucleotide or nucleoside with the same base. 
     
     
         23 . A method of performing Sanger or Sanger-type sequencing comprising addition of a compound according to  claim 1  to a Sanger or Sanger-type sequencing method. 
     
     
         24 . A method of performing mini-sequencing or minisequencing-type sequencing comprising addition of a compound according to  claim 1  to a mini-sequencing or minisequencing-type sequencing method.