Chinese Journal of Applied Chemistry ›› 2024, Vol. 41 ›› Issue (1): 109-117.DOI: 10.19894/j.issn.1000-0518.220401

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MicroRNA Sensing Based on Gold Nanoparticle Aggregation and Hybridization Chain Amplification

Yang SHU, Man YANG, Zhi-Hao LI, Jian-Hua WANG()   

  1. Research Center for Analytical Sciences,Department of Chemistry,College of Sciences,Northeastern University,Shenyang 110819,China
  • Received:2022-12-12 Accepted:2023-03-18 Published:2024-01-01 Online:2024-01-30
  • Contact: Jian-Hua WANG
  • About author:jianhuajrz@mail.neu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21974018)

Abstract:

MicroRNA (miRNA) is the marker for early diagnosis of cancer and plays a key role in physiological and pathological processes, therefore real-time and accurate monitoring of miRNA is of great significance. Currently, signal amplification/magnification strategies for miRNA assay are mostly dependent on the involvement of coenzymes. In this paper, a highly sensitive and specific miRNA detection method based on gold nanoparticle (AuNPs) aggregation and hybridization chain reaction (HCR) enzyme-free amplification is established. An assisted hairpin probe (HP) and two universal hairpin probes (H1/H2) are designed. Both of them are single-stranded DNA (ssDNA) with sticky ends, which could stabilize AuNPs in aqueous solution and effectively prevent salt-induced aggregation. The target miRNA hybridizes with the HP loop region, initiating HCR to trigger the formation of double-stranded DNA (dsDNA) polymers. The dsDNA polymer has no sticky ends and no ability to stabilize gold nanoparticles, resulting in salt-induced aggregation of AuNPs, and the change of gold-colloidal solution from wine red to blue. Thus, miRNA can be detected by spectrophotometry. This strategy does not rely on enzymatic reactions, separation processes, and chemical modifications, and operation is simple. By designing the HP loop sequence, the detection of different targets can be realized and show good versatility.

Key words: Gold nanoparticles, Hybridization chain reaction, Aggregation, Colorimetry

CLC Number: