摘要:
Minor groove binder phosphoramidites having the formula M-L-PA, wherein M is a minor groove binder comprising a protected heteroaromatic amine, L is a linker, and PA is a phosphoramidite group, have been synthesized. Preferred methods of synthesis include synthesizing a minor groove binder intermediate containing a transiently protected hydroxyl group, protecting heteroaromatic amines of the corresponding minor groove binder intermediate as carbamate intermediates, reacting the carbamate intermediate to remove the transient protecting group to yield carbamate-protected minor groove binder agent as an intermediate with a free hydroxyl group, and converting the intermediate with a free hydroxyl group to the desired minor groove binder phosphoramidite. These minor groove binder phosphoramidites are useful in the preparation of oligonucleotide conjugates, particularly those for use as probes and primers. In preferred methods, an oligonucleotide sequence is synthesized using nucleoside phosphoramidites and the minor groove binder phosphoramidite is incorporated into the oligonucleotide sequence to form a protected oligonucleotide-minor groove binder conjugate. Then, deprotection produces the oligonucleotide-minor groove binder.
摘要:
3-alkynyl inosine analogs and their uses as universal bases are provided. The inosine analogues can be incorporated into nucleic acid primers and probes. They do not significantly destabilize nucleic acid duplexes. As a result, the novel nucleic acid primers and probes incorporating the inosine analogues can be used in a variety of methods. The analogs function unexpectedly well as universal bases. Not only do they stabilize duplexes substantially more than hypoxanthine opposite A, C, T, and G but they are also recognized in primers by polymerases, allowing efficient amplification.
摘要:
Compositions and methods for inhibiting the actions of non-coding RNAs such as miRNAs and piRNAs are provided. The compositions comprise single or double stranded oligonucleotides conjugated with Minor Groove Binders (“MGBs”). The oligonucleotides can vary in length, can contain nucleotides having one or more modifications, and have regions that are substantially complementary to one or more mature miRNAs or piRNAs.
摘要:
The present invention relates to a hyperthermostable endonuclease IV substrate probe to be used in nucleic acid assay methods which can be carried out using hyperthermostable enzymes, including detection of target nucleic acids, and detection of nucleic acid polymorphism.
摘要:
Methods, primers and probes are provided for the isothermal amplification and detection, without denaturation, of double stranded nucleic acid targets for polymerase strand displacement amplification (“iSDA”). The methods and compositions disclosed are highly specific for nucleic acid targets with high sensitivity, specificity and speed that allow detection of clinical relevant target levels. The methods and compositions can easily be used to amplify or detect nucleic acid targets in biological samples.
摘要:
Conjugates between a minor groove binding molecule, such as the trimer of 1,2-dihydro-(3H)-pyrrolo[3,2-e]indole-7-carboxylate (CDPI3), and an oligonucleotide form unusually stable hybrids with complementary target sequences, in which the tethered CDPI3 group resides in the minor groove of the duplex. These conjugates can be used as probes and primers. Due to their unusually high binding affinity, conjugates as short as 8-mers can be used as amplification primers with high specificity and efficiency. MGB conjugation also increases the discriminatory power of short oligonucleotides, providing enhanced detection of nucleotide sequence mismatches by short oligonucleotides. The MGB-conjugated probes and primers described herein facilitate various analytic and diagnostic procedures, such as amplification reactions, PCR, detection of single-nucleotide polymorphisms, gene hunting, differential display, fluorescence energy transfer, hydrolyzable probe assays and others; by allowing the use of shorter oligonucleotides, which have higher specificity and better discriminatory power.
摘要:
Oligonucleotide probes containing two labels are provided and are useful in hybridization assays. The probes can also contain a minor groove binding group.
摘要:
The present invention provides a negatively charged minor groove binding compound, oligonucleotide conjugates comprising the same, and methods for using the same. The negatively charged minor groove binding compounds of the present invention comprises an acidic moiety that is capable of being ionized under physiological conditions. In particular, the negatively charged minor groove binding compound of the present invention comprises a binding moiety that binds preferentially into a minor groove of a double, triple or higher stranded DNA, RNA, PNA or hybrids thereof. The binding moiety comprises at least one aryl moiety and an acidic moiety which is covalently attached to a phenyl portion of the aryl moiety or to a heteroatom of a heteroaryl portion of the aryl moiety.
摘要:
Minor groove binder-oligonucleotide probes are provided along with methods for their use wherein the probes have an attached fluorophore which, in an unhybridized form exhibits very low background signal.
摘要:
Software systems and methods for predicting the melting temperature (Tm) and other characteristics of oligonucleotides, including modified oligonucleotides. Modified oligonucleotides are provided containing bases selected from unsubstituted and 3-substituted pyrazolo[3,4-d]pyrimidines and 5-substituted pyrimidines, and optionally have attached minor groove binders and reporter groups.