Dual-Labeled Probes are the most common probe type for qPCR and are often referred to as hydrolysis probes.
A Dual-Labeled Probe is a single-stranded oligonucleotide labeled with two different dyes. A reporter dye is located at the 5’ end and a quencher molecule located at the 3’ end. The quencher molecule inhibits the natural fluorescence emission of the reporter by fluorescence resonance energy transfer (FRET). The illustration below depicts the mechanism.
The primer is elongated by the polymerase and the probe binds to the specific DNA template. Hydrolysis releases the reporter from the probe/target hybrid, causing an increase in fluorescence. The measured fluorescence signal is directly proportional to the amount of target DNA.
Our probes are provided in a format to simplify your experimental planning.
3Cyanine 3 alternative
5Cyanine 5 alternative
Beginning May 8, 2022, BHQ™ (Black Hole Quencher™) 1 and 2 will no longer be available as a modification to Custom DNA Oligos and Custom qPCR Probes. The replacements will be BXQ™ (Block All Quencher™) 1 and 2. Information about the BXQ dark quenchers will be added from time-to-time to key oligo landing pages up until the date of change. As these key landing pages are updated, this message will be updated to provide links to the new information. If you have any questions, please contact your local company representative.
Alternatively, to learn more about BXQ, please visit the manufacturer’s website: BXQ | AAT Bioquest.