Reagents and methods of PCR
First Claim
1. A reaction mixture for a primer-dependent DNA amplification reaction including primer extension by a DNA polymerase for amplifying at least one DNA target sequence, said reaction mixture comprising:
- (a) at least one primer pair;
(b) a DNA polymerase;
(c) dNTPs; and
(d) at least one double-stranded oligonucleotide additive;
(i) comprising two separate strands, each of the strands 6-50 nucleotides long;
(ii) that is at least fifty percent double-stranded at 32°
C.; and
(iii) that has a terminal region on each end of its two separate strands and includes 1-4 modifying groups, each covalently attached to a different terminal region, said modifying groups being polycyclic moieties that do not have bulky portions that are non-planar,wherein said at least one double-stranded oligonucleotide additive is present in the reaction mixture at a concentration sufficient to suppress mispriming of an amplification reaction performed using the reaction mixture.
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Accused Products
Abstract
Modified double-stranded oligonucleotides that have terminal regions on each of their strands, that have a hybrid length of 6-50 nucleotides long, that have a melting temperature Tm of at least 32° C., and that include 2-4 modifying groups, each covalently attached to a different terminal region, preferably to a terminal nucleotide, said modifying groups being polycyclic substituents that do not have bulky portions that are non-planar, said modified oligonucleotide being capable of binding to the 5′ exonuclease domains of DNA polymerases and, when included in a PCR or other primer-dependent DNA amplification reaction at a concentration, generally not more than 2000 nM, that is effective for at least one of the functions of suppressing mispriming, increasing polymerase selectivity against 3′ terminal mismatches. Increasing polymerase selectivity against AT-rich 3′ ends, reducing scatter among replicates, suppressing polymerase 5′ exonuclease activity, and inhibiting polymerase activity; as well as amplification reaction mixtures containing such modified double-stranded oligonucleotides, and amplification reactions, amplification assays and kits that include such modified double-stranded oligonucleotides.
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Citations
20 Claims
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1. A reaction mixture for a primer-dependent DNA amplification reaction including primer extension by a DNA polymerase for amplifying at least one DNA target sequence, said reaction mixture comprising:
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(a) at least one primer pair; (b) a DNA polymerase; (c) dNTPs; and (d) at least one double-stranded oligonucleotide additive; (i) comprising two separate strands, each of the strands 6-50 nucleotides long; (ii) that is at least fifty percent double-stranded at 32°
C.; and(iii) that has a terminal region on each end of its two separate strands and includes 1-4 modifying groups, each covalently attached to a different terminal region, said modifying groups being polycyclic moieties that do not have bulky portions that are non-planar, wherein said at least one double-stranded oligonucleotide additive is present in the reaction mixture at a concentration sufficient to suppress mispriming of an amplification reaction performed using the reaction mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A modified double-stranded oligonucleotide comprising two separate strands, each of the strands 6-50 nucleotides long, that is at least fifty percent double-stranded at 32°
- C., that has a terminal region on each end of its two separate strands, and that includes 2-4 modifying groups, each covalently attached to a different terminal region, said modifying groups being polycyclic moieties that do not have bulky portions that are non-planar, said modified oligonucleotide being capable of inhibiting the 5′
exonuclease domains of DNA polymerases. - View Dependent Claims (19, 20)
- C., that has a terminal region on each end of its two separate strands, and that includes 2-4 modifying groups, each covalently attached to a different terminal region, said modifying groups being polycyclic moieties that do not have bulky portions that are non-planar, said modified oligonucleotide being capable of inhibiting the 5′
Specification