High-Resolution Melting Analysis in Genomic Characterization

High-Resolution Melting (HRM) analysis is a post-PCR technique that distinguishes nucleic acid variants by measuring the precise temperature at which double-stranded DNA fragments dissociate into single strands. In a closed-tube format, DNA is amplified in the presence of a fluorescent intercalating dye, and the fluorescence decline during a controlled temperature ramp provides a unique melting profile for each sequence. By comparing these profiles, HRM can detect single-nucleotide polymorphisms, small insertions or deletions and epigenetic modifications without the need for probes or sequencing. The method is rapid, cost-effective and amenable to high-throughput workflows. It has found applications in clinical diagnostics for mutation scanning, in biodiversity and forensic science for species identification, and in research settings for epigenetic and genotyping studies. The global significance of HRM lies in its ability to accelerate variant detection in resource-limited laboratories while maintaining sensitivity and specificity comparable to more resource-intensive methods. Practical considerations such as DNA template quality, amplicon design and instrument calibration are critical for robust performance and reproducible inter-laboratory results.

Research from Nature Portfolio

Recent studies have refined HRM-based genotyping techniques to enhance specificity and broaden application scope. One approach combines modified allele-specific PCR with quantitative PCR and HRM readout to detect single-nucleotide variants with high analytical sensitivity. By introducing an engineered mismatch in primers and utilising dye-based qPCR, researchers achieved robust discrimination across a panel of common cancer-associated mutations, enabling rapid assay design and validation without labelled probes. In another advance, HRM was integrated into a three-gene mitochondrial assay to differentiate legal and illicit wildlife by their unique melting signatures. This low-cost method targets conserved regions of cytochrome oxidase I, cytochrome b and 16S rRNA genes to pre-screen large numbers of bushmeat samples in forensic pipelines, demonstrating clear species-level resolution in high-throughput settings.

High-Resolution Melting Analysis in Genomic Characterization publication trend

The graph below shows the total number of articles in high-resolution melting analysis in genomic characterization across all publications each year (not limited to Nature Index journals).

Technical terms

High-Resolution Melting (HRM): A technique that monitors fluorescence changes during controlled DNA denaturation to distinguish sequence variants.

Amplicon: A DNA fragment produced by polymerase chain reaction, defined by its specific primer pair.

Single-Nucleotide Polymorphism (SNP): A single-base variation in a DNA sequence among individuals of a species.

Quantitative PCR (qPCR): A method to amplify and simultaneously quantify target DNA using fluorescent reporters.

Intercalating Dye: A fluorescent molecule that binds double-stranded DNA and releases fluorescence upon denaturation.

References

1. High Resolution Melting (HRM) for High-Throughput Genotyping—Limitations and Caveats in Practical Case Studies. International Journal of Molecular Sciences (2017).
2. Cost-effective and robust genotyping using double-mismatch allele-specific quantitative PCR. Scientific Reports (2019).
3. Three-gene PCR and high-resolution melting analysis for differentiating vertebrate species mitochondrial DNA for biodiversity research and complementing forensic surveillance. Scientific Reports (2020).
4. Distinguishing venomous jellyfish species via high resolution melting analysis. Frontiers in Marine Science (2022).
5. Statistical methods for discrimination of STR genotypes using high resolution melt curve data. International Journal of Legal Medicine (2024).