Stabilized nucleic acid dark quencher-fluorophore probes
The present invention provides a new class of solids supports for synthesis of modified oligomers of nucleic acids, and nucleic acid probes that have a format expediently synthesized on the new supports. Exemplary solid supports include at least one quencher bound through a linker to the solid support. Various exemplary embodiments include a moiety that stabilizes a duplex, triplex or higher order aggregation (e.g., hybridization) of nucleic acids of which the oligomer of the invention is a component. Other components of the solid support include moieties that stabilize aggregations of nucleic acids, e.g., intercalators, minor groove binding moieties, bases modified with a stabilizing moiety (e.g., alkynyl moieties, and fluoroalkyl moieties), and conformational stabilizing moieties, such as those described in commonly owned U.S. Patent Application Publication No. 2007/0059752.
1. A nucleic acid oligomer comprising at least one base, having a formula selected from:
wherein
R 10 is an alkynyl moiety; and
a quencher of fluorescence energy comprising at least three residues, each independently selected from substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl and combinations thereof, wherein at least two of said residues are covalently linked via an exocyclic diazo bond; and
wherein said quencher is attached at the 3 ′end or the 5′end of said nucleic acid oligomer.
2. The nucleic acid oligomer according to claim 1 , wherein said quencher is of a structure according to Formula V:
wherein
R 1 , R 2 and R 3 are members independently selected from substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl;
X and Y are members independently selected from a reactive functional group and a linkage fragment covalently binding said quencher to the nucleic acid oligomer, with the proviso that at least one of X and Y is said linkage fragment;
m is an integer from 0 to 5, such that when m is greater than 1, the X groups are the same or different; and
v is an integer from 1 to 10.
3. The nucleic acid oligomer according to claim 2 , wherein v is 1.
4. The nucleic acid oligomer according to claims 2 , wherein said linkage fragment is NH or NR t , wherein R t is selected from substituted or unsubstituted alkyl and substituted or unsubstituted heteroalkyl.
5. The nucleic acid oligomer according to claim 1 , wherein said quencher is of a structure according to Formula VI:
wherein
R 5 , R 6 and R 7 are members independently selected from —NR′R″, substituted or unsubstituted aryl, nitro, substituted or unsubstituted C 1 -C 6 alkyl, and substituted or unsubstituted C 1 -C 6 alkoxy,
wherein R′ and R″ are independently selected from H and substituted or unsubstituted C 1 -C 6 alkyl;
X and Y are members independently selected from a reactive functional group and a linkage fragment covalently binding said quencher to the nucleic acid oligomer, with the proviso that at least one of X and Y is said linkage fragment;
n is an integer from 0 to 1;
a is an integer from 0 to 4, such that when a is greater than 1, the R 5 groups are the same or different;
b is an integer from 0 to 4, such that when (v x b) is greater than 1, the R 6 groups are the same or different;
c is an integer from 0 to 5, such that when c is greater than 1, the R 7 groups are the same or different; and
v is an integer from 1 to 10, such that when v is greater than 1, the value of b on each of the v phenyl rings is the same or different.
6. The nucleic acid oligomer according to claim 5 , wherein v is 1.
7. The nucleic acid oligomer according to claim 6 , wherein said quencher has a structure selected from:
wherein X 5 is a linkage fragment covalently binding said quencher to the nucleic acid oligomer.
8. The nucleic acid oligomer according to claim 5 , wherein said linkage fragment is NH or NR t , wherein R t is selected from substituted or unsubstituted alkyl and substituted or unsubstituted heteroalkyl.
9. The nucleic acid oligomer according to claim 1 , wherein said quencher is of a structure according to Formula (II)
wherein
R 1 , R 2 and R 3 are members independently selected from substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl;
wherein a member selected from R 1 , R 2 and R 3 includes a structure according to Formula IV:
wherein R 4 is a member selected from alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl and substituted heteroaryl;
X, Y and Y′ are members independently selected from a reactive functional group and a linkage fragment covalently binding said quencher to the nucleic acid oligomer, with the proviso that at least one of X, Y and Y′ is said linkage fragment;
f is an integer from 0 to 4, such that when (f x s) is greater than 1, the Y′ groups are the same or different;
m is an integer from 0 to 5, such that when m is greater than 1, the X groups are the same or different;
n is an integer from 0 to 6, such that when (n x t) is greater than 1, the Y groups are the same or different;
s is an integer from 0 to 6, such that when s is greater than 1 the R 3 groups are the same or different; and
t is an integer from 1 to 6, such that when t is greater than 1 the R 2 groups are the same or different, and when t is 1 and s is 0, a member selected from R 1 , R 2 and combinations thereof is a member selected from substituted or unsubstituted polycyclic aryl and substituted or unsubstituted polycyclic heteroaryl groups.
10. The nucleic acid oligomer according to claim 9 , wherein said quencher is of a structure according to Formula (III):
11. The nucleic acid oligomer according to claim 9 , wherein said quencher has the structure:
wherein
X 5 and X 6 are members independently selected from H, a reactive functional group and a linkage fragment covalently binding said quencher to the nucleic acid oligomer, with the proviso that at least one of X 5 and X 6 is said linkage fragment.
12. The nucleic acid oligomer according to claim 9 , wherein said linkage fragment is NH or NR t , wherein R t is selected from substituted or unsubstituted alkyl and substituted or unsubstituted heteroalkyl.
13. The nucleic acid oligomer according to claim 1 , wherein said nucleic acid oligomer is a probe.
14. The nucleic acid oligomer according to claim 13 , wherein said probe is selected from molecular beacons, conformationally assisted probes, light up probes, and invader detection probes.
15. The nucleic acid oligomer according to claim 1 , wherein said alkynyl moiety is selected from the group consisting of: ethynyl, 1-propynyl, 1-butynyl, 1-pentynyl, 1,3-pentadiynyl, phenylethynyl, phenylethynyl, pyridine-ethynyl, pyrimidine-ethynyl, triazine-ethynyl, thiophene-ethynyl, thiazole-ethynyl, imidazole-ethynyl and substituted or unsubstituted C 1 -C 10 alkynyl groups.
16. The nucleic acid oligomer according to claim 15 , wherein the substituents for the C 1 -C 10 alkynyl groups are selected from the group consisting of: 2-, 3-, and 4-pyridinyl; triazine; 2-, 4- and 5-pyrimidinyl; 2-, 4- and 5-thiazolyl; 1-methyl-2-imidazolyl; 2- and 4-imidazolyl; 2-, 4- and 5-oxazolyl; 3-pyridinyl; 4-pyridinyl; 2-pyridinyl; 2- and 3-thienyl; 2- and 3-furanyl; 2- and 3-pyrrolyl; propenyl (—CH═CH—CH 3 ); vinyl; and —C≡C—Z′ where Z′ is hydrogen (H) or C 1 -C 10 alkyl, C 1 -C 10 alkyl with 1 to 6 halogen atoms; or C 1 -C 10 heteroalkyl having 1 to 3 heteroatoms selected from the group consisting of O, N and S.
17. The nucleic acid oligomer according to claim 15 , wherein said alkynyl moiety is 1-propynyl.
18. The nucleic acid oligomer according to claim 1 , further comprising a fluorophore.
19. The nucleic acid oligomer according to claim 1 contains 8 to 30nucleomonomers.
20. A method for detecting or quantifying one or more target nucleic acid molecules, said method comprising:
(a) providing a sample;
(b) contacting the sample with a composition comprising the oligomer according to claim 1 under conditions that allow hybridization of said oligomer to said target nucleic acid molecules; and
(c) detecting or quantifying one or more target nucleic acid molecules of the sample that have hybridized to one or more said oligomer.