RNase H-based assays utilizing modified RNA monomers
First Claim
Patent Images
1. A method of amplifying a target DNA sequence, the method comprising the steps of:
- (a) providing a reaction mixture at a starting temperature at or below 40°
C. wherein the reaction mixture comprises;
(i) a first oligonucleotide primer having a cleavage domain positioned 5′
of a blocking group, the blocking group linked at or near the end of the 3′
-end of the oligonucleotide primer, wherein the blocking group prevents primer extension and/or PCR,(ii) a sample nucleic acid that may or may not have the target sequence,(iii) a cleaving enzyme, wherein the cleaving enzyme is an RNase H2 enzyme,(iv) a polymerase, and(v) optionally, a second oligonucleotide primer in reverse orientation to support PCR;
(b) elevating the temperature of the reaction mixture to at or above 50°
C. to increase the activity of the RNase H2 enzyme;
(c) hybridizing the blocked oligonucleotide primer to the target DNA sequence to form a double-stranded substrate;
(d) cleaving the hybridized oligonucleotide primer with the cleaving enzyme at a point within or adjacent to the cleavage domain to remove the blocking group from the oligonucleotide primer; and
(e) extending the oligonucleotide primer with the polymerase,wherein the RNase H2 enzyme has, at the starting temperature, less than about 16% of the activity that the RNase H2 enzyme has at the elevated temperature in step (b).
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides methods of cleaving a nucleic acid strand to initiate, assist, monitor or perform biological assays.
58 Citations
11 Claims
-
1. A method of amplifying a target DNA sequence, the method comprising the steps of:
-
(a) providing a reaction mixture at a starting temperature at or below 40°
C. wherein the reaction mixture comprises;(i) a first oligonucleotide primer having a cleavage domain positioned 5′
of a blocking group, the blocking group linked at or near the end of the 3′
-end of the oligonucleotide primer, wherein the blocking group prevents primer extension and/or PCR,(ii) a sample nucleic acid that may or may not have the target sequence, (iii) a cleaving enzyme, wherein the cleaving enzyme is an RNase H2 enzyme, (iv) a polymerase, and (v) optionally, a second oligonucleotide primer in reverse orientation to support PCR; (b) elevating the temperature of the reaction mixture to at or above 50°
C. to increase the activity of the RNase H2 enzyme;(c) hybridizing the blocked oligonucleotide primer to the target DNA sequence to form a double-stranded substrate; (d) cleaving the hybridized oligonucleotide primer with the cleaving enzyme at a point within or adjacent to the cleavage domain to remove the blocking group from the oligonucleotide primer; and (e) extending the oligonucleotide primer with the polymerase, wherein the RNase H2 enzyme has, at the starting temperature, less than about 16% of the activity that the RNase H2 enzyme has at the elevated temperature in step (b). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification