Molecular Diagnostic Techniques for Nucleic Acid Detection

Molecular diagnostics for nucleic acid detection encompass a suite of technologies designed to identify and quantify specific DNA or RNA sequences with high sensitivity and specificity. Central approaches include polymerase chain reaction (PCR) and its quantitative variant (qPCR), which rely on thermal cycling to amplify target sequences, as well as isothermal amplification methods such as loop‐mediated isothermal amplification (LAMP) and recombinase polymerase amplification (RPA), which operate at a constant temperature to simplify instrumentation. Recent innovations have extended conventional workflows by integrating microfluidic sample preparation, nanoporous enrichment materials and digital quantification platforms to reduce turnaround times and to enhance point‐of‐care applicability. Emerging PCR‐free strategies exploit nanostructure‐induced fluid dynamics and luminescence resonance energy transfer to detect nucleic acids directly, while CRISPR‐based detection harnesses guide RNAs and nucleases for sequence‐specific read‐outs. Together, these advances have broad implications for infectious disease surveillance, personalised oncology assays, environmental monitoring and decentralised testing in low‐resource settings.

Research from Nature Portfolio

Recent studies have introduced a nanoscale enrichment platform featuring biporous silica nanofilms within a microfluidic chip that generates a controlled nanovortex, markedly increasing surface area and capture efficiency for pathogen and nucleic acid isolation. This design achieves a 100-fold lower limit of detection compared with conventional extraction methods and supports PCR-free detection when coupled with a luminescence resonance energy transfer assay. In another key development, droplet digital PCR technology has been benchmarked against quantitative PCR for low-abundance targets. The comparative analysis demonstrated that digital partitioning yields superior precision, reproducibility and statistical confidence for samples containing sparse nucleic acid copies, and provided a methodological framework to guide the choice between digital and quantitative platforms in various diagnostic contexts.

Molecular Diagnostic Techniques for Nucleic Acid Detection publication trend

The graph below shows the total number of articles in molecular diagnostic techniques for nucleic acid detection across all publications each year (not limited to Nature Index journals).

Technical terms

Polymerase Chain Reaction (PCR): A method that uses thermal cycling to amplify specific DNA sequences exponentially.

Loop-mediated Isothermal Amplification (LAMP): An amplification technique operating at a single temperature via strand-displacing DNA polymerase and multiple primers.

Recombinase Polymerase Amplification (RPA): A rapid isothermal method that employs recombinase proteins to target primers and facilitate strand displacement.

Digital PCR (dPCR): A partition-based PCR approach that quantifies nucleic acids by counting positive reactions in discrete microreactors.

Microfluidics: The manipulation of small volumes of fluids in channels with dimensions of tens to hundreds of micrometres, enabling integrated sample processing.

Limit of Detection (LoD): The smallest concentration of a target analyte that can be reliably distinguished from background noise.

References

1. Biporous silica nanostructure-induced nanovortex in microfluidics for nucleic acid enrichment, isolation, and PCR-free detection. Nature Communications (2024).
2. Droplet Digital PCR versus qPCR for gene expression analysis with low abundant targets: from variable nonsense to publication quality data. Scientific Reports (2017).
3. Multiplexed Ultrasensitive Sample‐to‐Answer RT‐LAMP Chip for the Identification of SARS‐CoV‐2 and Influenza Viruses. Advanced Materials (2023).
4. Microfluidics for Rapid Detection of Live Pathogens. Advanced Functional Materials (2023).
5. Review: a comprehensive summary of a decade development of the recombinase polymerase amplification. Analyst (2018).