Cross-reactive hybridization probe for detecting HIV-1 and HIV-2 nucleic acids in the P31 gene sequence
Cross-reacting hybridization probe for detecting HIV-1 and HIV-2 nucleic acids. The probe advantageously exhibited uniformly high signal-to-noise ratios when hybridized to HIV-1 and HIV-2 target nucleic acids. The probe can be used, for example, in screening applications for detecting donated blood contaminated with either of the two analytes.
1. A hybridization assay probe for detecting HIV-1 and HIV-2 nucleic acids, up to 60 bases in length, comprising a probe sequence of a target-complementary sequence of bases, wherein said target-complementary sequence of bases consists of SEQ ID NO:25 or the complement thereof, allowing for the presence of RNA and DNA equivalent bases.
2. The hybridization assay probe of claim 1 , wherein said target-complementary sequence of bases is contained in the structure of a molecular beacon.
3. The hybridization assay probe of claim 1 , wherein said target-complementary sequence of bases comprises at least one ribonucleoside having a 2′-O-methyl substitution to a ribofuranosyl moiety.
4. The hybridization assay probe of claim 1 , further comprising a detectable label selected from the group consisting of a chemiluminescent label, and a fluorescent label.
5. The hybridization assay probe of claim 4 , wherein the detectable label is joined to the probe by a non-nucleotide linker.
6. The hybridization assay probe of claim 4 , wherein the detectable label is a chemiluminescent label.
7. The hybridization assay probe of claim 1 , wherein said hybridization assay probe is hybridized to an in vitro synthesized HIV-1 or HIV-2 nucleic acid amplification product to form a hybridization complex.
8. The hybridization assay probe of claim 7 , wherein said hybridization probe present in said hybridization complex emits detectable signal.
9. A kit for detecting HIV-1 and HIV-2, comprising in packaged combination:
a probe in accordance with claim 1 ; and
a pair of primers for amplifying HIV-1 nucleic acids and HIV-2 nucleic acids in the p31 gene sequence.
10. The kit of claim 9 , wherein said pair of primers is a pair of cross-reactive primers that comprises
a first primer sequence that consists of SEQ ID NO:14, optionally comprising an upstream sequence that is not complementary to either HIV-1 or HIV-2 nucleic acid; and
a second primer sequence that consists of SEQ ID NO:7, optionally comprising an upstream sequence that is not complementary to either HIV-1 or HIV-2 nucleic acid.
11. The kit of claim 9 , further comprising primers and probes for amplifying and detecting HCV and HBV.
12. A method for determining that a test sample contains at least one of HIV-1 nucleic acid and HIV-2 nucleic acid, comprising the steps of:
(a) contacting any nucleic acids that may be contained in the test sample with a hybridization probe according to claim 1 ; and
(b) detecting formation of any hybridization duplexes comprising the hybridization probe and said any nucleic acids that may be contained in the test sample as an indication that the test sample contains at least one of HIV-1 nucleic acid and HIV-2 nucleic acid.
13. The method of claim 12 , wherein contacting step (a) further comprises contacting said any nucleic acids that may be contained in the test sample with a second hybridization probe, said second hybridization probe yielding a detectable signal following contact with nucleic acids of HIV-1, but not yielding a detectable signal following contact with nucleic acids of HIV-2.
14. The method of claim 12 , wherein contacting step (a) further comprises contacting said any nucleic acids that may be contained in the test sample with a hybridization probe that yields a detectable signal following contact with an HCV nucleic acid.
15. The method of claim 12 , wherein contacting step (a) further comprises contacting said any nucleic acids that may be contained in the test sample with a hybridization probe that yields a detectable signal following contact with an HBV nucleic acid.