摘要:
A single stranded nucleic acid biosensor for S-adenosylhomocysteine (SAH) is provided. The single stranded nucleic acid may include a SAH-binding riboswitch domain comprising a P2′ stem and a contiguous Spinach aptamer domain terminated at a P2 stem that is operably connected to the P2′ stem of the SAH-binding riboswitch domain via a P2/P2′ stem comprising 5 base pairs or less. The SAH biosensor may further include a signaling chromophore specifically bound to the Spinach aptamer domain, where the sensor is configured to fluorescently activate the signaling chromophore upon specific binding of SAH to the SAH-binding riboswitch domain. Also provided are methods in which the subject SAH biosensors fmd use including methods for determining the level of SAH in a sample and methods for determining the level of methyltransferase activity in a cell. Nucleic acid constructs for the single stranded nucleic acid and host cells including the same are also provided.
摘要:
The present invention provides novel primers and methods for the detection of specific nucleic acid sequences. The primers and methods of the invention are useful in a wide variety of molecular biology applications and are particularly useful in allele specific PCR.
摘要:
The present invention provides a nucleic acid probe that can achieve high detection sensitivity and high specificity in mutation detection, mismatch detection, etc. by the PCR method, a method for designing such a nucleic acid probe, and a method for detecting a target sequence. The nucleic acid probe includes a nucleic acid molecule, and the nucleic acid molecule includes a plurality of fluorescent dye moieties that exhibit an excitonic effect. At least two of the fluorescent dye moieties that exhibit an excitonic effect are bound to the same base or two adjacent bases in the nucleic acid molecule with each fluorescent dye moiety being bound via a linker (a linking atom or a linking atomic group). The extension-side end of the nucleic acid molecule is chemically modified, thereby preventing an extension reaction of the nucleic acid molecule.
摘要:
An analyte [25] in a matrix is sensed using a sensing device having a detection probe [21] conjugated to a mediator-receptor [22] that is not a binder for the analyte. The sensor device is provided with mediators [23] conjugated to analyte-receptors [24], where the mediators are selected to bind to the mediator-receptors, and where the analyte-receptors are selected to bind to the analyte. In some embodiments, the mediators are bound to the detection probe by a tether molecule, or tether molecule fragment, or tether domain. In other embodiments, the mediators are not bound to the detection probe. The presence of the analyte is detected by optically or electrically detecting changes of distance between the mediators and the mediator-receptor, indicative of association and/or dissociation events between mediators and mediator-receptor, the characteristics of which are affected by whether the analyte is bound to the analyte-receptor.
摘要:
The invention relates to a method for analysis of the AT/GC ratio of DNA by stretching the DNA in nanochannels and performing melting mapping of the AT/GC ratio along the DNA molecule.
摘要:
The invention provides comprehensive and comparative flow cytometry-based methods for characterizing the state of a biological system by determining cell phenotypes and associated gene expression profiles.
摘要:
The invention relates to a method for analysis of the AT/GC ratio of DNA by stretching the DNA in nanochannels and performing melting mapping of the AT/GC ratio along the DNA molecule.
摘要:
A primer and method for amplification of a target nucleic acid, the primer adapted to conform into a conformation that dissociates from a complementary strand of DNA duplex. The conformation may have a free energy with more favorable thermodynamics than a corresponding DNA duplex, such as a B-DNA duplex. The dissociation may occur during an extension step of an amplification method, such as polymerase chain reaction. The method can proceed isothermally, and the primers may include intrinsic fluorescence.
摘要:
The disclosure relates to novel probes for use in LAMP detection methods. The probes contain a single fluorophore label bound to an internal cytosine residue of the probe. The probes are particularly useful in the detection of chlamydia and gonorrhea infections in a patient.