Simultaneous Detection of Multiple Pathogenic Targets with Stem-Tagged Primer Sets

Area of Science:

• Molecular Biology
• Biotechnology
• Genetics

Background:

• Simultaneous multiple gene detection is crucial for analyzing limited biological samples, often obtained invasively.
• Current probe-based fluorescence melting curve analysis via real-time PCR is restricted by the need for unique probe sequences with distinct melting temperatures (Tm) for each target gene.

Purpose of the Study:

• To develop an advanced method for simultaneous multiple gene detection that overcomes the limitations of existing techniques.
• To enable the detection of numerous genes from small sample volumes using a novel molecular beacon approach.

Main Methods:

• Developed a simultaneous multiple gene detection method utilizing a giant amplicon molecular beacon.
• Implemented Polymerase Chain Reaction (PCR) with stem sequences of varying melting temperatures (Tm) attached to each primer set.
• Measured melting Tm by hybridizing stem sequences at both ends of the amplified amplicon, generating distinct Tm signals.

Main Results:

• Successfully achieved simultaneous detection of four samples using only a single fluorophore.
• Demonstrated that the stem sequences, which generate Tm signals, are arbitrarily selectable and unrelated to the target gene, allowing for adjustable Tm.
• Theoretically, a combination of five fluorophores could facilitate simultaneous detection of over 20 multiple genes.

Conclusions:

• The developed giant amplicon molecular beacon method offers a flexible and efficient approach for simultaneous multiple gene detection.
• This technique significantly expands the capacity for multiplex gene analysis, particularly from limited sample quantities.
• The arbitrary selection of stem sequences provides precise control over Tm values, enhancing multiplexing capabilities.