The Nobel Prize and the Genetic Revolution: How Raman Spectroscopy Unlocks a New Era in miRNA Detection

2025-01-14

Figure 1: Nobel Prize in Physiology or Medicine 2024 Announced on October 7th

Their research addressed a fundamental question: why do all the cells in the same organism, despite having identical chromosomes, differentiate into various types (e.g., muscle cells and nerve cells) with distinct physiological functions? The answer lies in how genetic information is regulated, with miRNA playing a crucial role. The principles discovered by the scientists have opened new avenues for understanding the functions of living organisms and how they develop.

Figure 2: miRNA Regulation of Cell Differentiation and Physiological Function

miRNA regulates gene expression to maintain normal cell function, and its dysregulation can lead to serious health issues. As a result, miRNA has become a focus of basic research and a potential tool for precision medicine. With deeper research, early detection of changes in miRNA expression has become critical for disease screening and personalized healthcare. However, due to the small size, low concentration, and complex structure of miRNA molecules, traditional detection methods struggle to achieve high sensitivity and label-free detection.

Raman spectroscopy, particularly Surface-Enhanced Raman Spectroscopy (SERS), has shown immense potential in this area. By enhancing Raman signals on metal nanostructures, SERS can detect miRNA molecules at extremely low concentrations, even enabling single-molecule detection. This breakthrough offers new opportunities for early disease screening, especially in areas such as cancer, where early and precise intervention is crucial. In addition to high sensitivity, SERS is label-free and non-destructive, allowing direct detection of miRNA without altering the molecular structure.

A 2017 article published in Advanced Materials (Impact Factor 27.4) introduced an innovative strategy based on chiral nanostructures to simultaneously detect miRNA and surface glycoproteins in live cells. This method demonstrated the potential for cancer screening, utilizing SERS for highly sensitive miRNA detection.

Figure 3: Surface-Enhanced Raman Spectroscopy for Detecting Cancer Biomarker miR-21

The research team created a nanostructure composed of graphene oxide (GO) and Au nanoparticles (Au NPs), linked by specific DNA strands. When target miRNA (such as miR-21) is present, it binds to the probe on the nanostructure, triggering a structural change that alters the Raman signal. This strategy allows real-time detection of miRNA and protein biomarkers in live cells. Experimental results confirmed the effectiveness of this strategy in live cells, particularly in breast cancer cells (MCF-7), where successful detection of miR-21 was achieved. The experiments showed a good linear relationship between SERS signals and miR-21 concentration, with a detection range of 0.07–13.68 amol/ng. Similar results were obtained in other cell lines such as HeLa and primary uterine fibroblasts.

This research provides a new approach for early cancer screening, combining the ultra-high sensitivity of SERS with multi-target detection capabilities. In the future, it could be used in broader clinical applications, such as miRNA detection in personalized medicine and designing targeted therapies in cancer treatment. Additionally, the method has low cytotoxicity, making it suitable for long-term live-cell experiments, laying the foundation for future clinical applications.

Advantages of SERS in Early Screening:

1.Ultra-high Sensitivity: Through the surface-enhancement effect of metal nanoparticles, SERS significantly amplifies weak Raman signals, making it suitable for detecting low-concentration miRNA.

2.Label-Free Detection: Unlike traditional methods like PCR, SERS does not require fluorescent or chemical labeling of miRNA, avoiding structural changes during the labeling process.

3.Multi-Target Detection: SERS can detect multiple miRNA molecules simultaneously, providing richer molecular information and making it ideal for complex biological sample analysis.

4.Real-Time, Rapid Detection: SERS enables real-time monitoring of miRNA molecular changes, helping scientists capture early gene expression changes related to diseases, which is crucial for early screening.

To achieve high-sensitivity miRNA detection, a powerful confocal Raman spectrometer is essential. The ATR8800 Confocal Raman Imaging Spectrometer from Optosky is equipped with ultra-high sensitivity, capable of detecting the 3rd Raman peak of monocrystalline silicon(SNR >30:1), helping you push the limits of detection in scientific research.