High-Resolution Melt PCR Analysis System

What is the High-Resolution Melt PCR Analysis System?

A real-time PCR platform with precise thermal control and saturating fluorescent dyes that resolves small melting temperature differences, allowing small sequence variants and genotypes to be distinguished without labelled probes or DNA sequencing.

Overview

High-resolution melt analysis extends real-time PCR by measuring fluorescence continuously while the temperature rises, typically from 60 to 95 °C at 0.02 to 0.1 °C per step. A saturating dye such as a third-generation intercalating dye avoids the dye redistribution that blurs curves, and the block or a separate optical module must hold temperature within a few hundredths of a degree. Software normalises curves, subtracts background and groups samples by melting profile, showing difference plots that reveal heteroduplexes from heterozygous samples. Short amplicons of 40 to 120 base pairs improve discrimination. The technique identifies single nucleotide variants, insertions, deletions and methylation differences after bisulfite treatment, and it is used for genotyping, mutation scanning and species identification.

How does it work?

PCR copies a target sequence with a thermostable DNA polymerase such as Taq, two primers that flank the target, deoxynucleoside triphosphates and a buffer. A thermal block cycles the reaction from about 95 °C, where double-stranded DNA separates, to 50 to 65 °C for primer annealing, then 72 °C for extension. Repeating 25 to 45 cycles doubles the product each round, so amplification is exponential while reagents last. Endpoint cyclers read the product afterwards on a gel or capillary system, while real-time instruments measure fluorescence each cycle using an intercalating dye or a hydrolysis probe, and the cycle threshold reflects the starting template amount. Quantitative results need a standard curve or reference gene, and melting curve analysis checks product specificity or detects sequence variants by high-resolution melting. Reverse transcription adds a step for RNA targets.

What are the key features?

• Continuous fluorescence measurement during controlled heating.
• Temperature resolution of 0.02 to 0.1 °C per step.
• Saturating dyes to avoid dye redistribution artefacts.
• Normalisation and difference-plot analysis software.
• Short amplicon design of 40 to 120 base pairs.
• Genotyping without probes or sequencing.

What are the technical specifications?

A typical high-resolution melt pcr analysis system configuration offers melting temperature range of 60-95 °C, temperature resolution of 0.02-0.1 °C per step, ramp rate during melt of 0.01-0.3 °C per second, optical channels of 2-4 channels, dye compatibility of Saturating intercalating dyes, probe chemistries and amplicon length of 40-120 bp recommended. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The High-Resolution Melt PCR Analysis System is used in single nucleotide variant genotyping, mutation scanning in plant and animal breeding, species and strain identification and methylation analysis after bisulfite treatment. Across the wider PCR class, laboratories also deploy it for gene expression analysis and transcript quantification, pathogen detection in clinical and food samples and genotyping and mutation screening.

Which standards and certifications apply?

Relevant standards and methods include ISO 13485 manufacturing, MIQE guidelines, CLSI MM03-A2, CLSI MM06-A2, IEC 61010-1 and IVDR (EU) 2017/746. Certification candidates for this model are CE, ISO 13485 manufacturing and IEC 61010-1 test report; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Keep pre-amplification and post-amplification work in separate areas with dedicated pipettes and filter tips, because carryover of amplicon is the main cause of false positives. Clean surfaces and equipment with fresh hypochlorite or a validated decontaminant, use UV where available and change gloves often. Calibrate block temperature and optical channels annually with a reference thermometer and dye plate, and check uniformity across the block. Verify performance with positive and negative controls and a standard curve in every run, and record Ct, efficiency and melt temperatures. Store primers and probes in small aliquots at the recommended temperature to avoid repeated freeze-thaw cycles, and protect fluorescent probes from light.

How do I select the right High-Resolution Melt PCR Analysis System?

Select this platform when variant discrimination is needed without the cost of labelled probes, or when a closed-tube screen precedes sequencing. Check temperature resolution during melting, dye compatibility and the analysis software, since curve normalisation determines whether small differences can be separated. Confirm that the assay design can use short amplicons and that controls for each genotype are available.

How does it compare with other PCR variants?

Decide first whether you need qualitative detection, relative or absolute quantification, or sequence variant discrimination, because that separates endpoint cyclers from real-time and melt systems. Next, set the number of optical channels, since multiplex panels need two to six channels and matching filter sets. Throughput follows the plate format: 96 wells suits most laboratories, while 384-well plates and automation fit high-volume screening. Check block type, maximum ramp rate, temperature uniformity and gradient capability, which help with new primer sets. For field work, consider size, power options and tolerance of ambient temperature. Confirm analysis software, export formats, primer and probe support, and the validation documentation your quality system requires.