MicroRNA (miRNA) 是重要的非编码 RNA 实体，通过与靶 mRNA 结合，导致 mRNA 降解或抑制其翻译，从而影响基因表达和功能。 miRNA广泛参与细胞分化、发育、代谢、凋亡等多种生物过程。此外，miRNA 与许多疾病相关，包括癌症。然而，传统的检测技术往往存在灵敏度低等缺点，因此我们需要开发一种快速高效的检测策略来准确检测miRNA。我们开发了一种创新的均相电化学发光（ECL）生物传感器。该生物传感器采用 CRISPR/Cas12a 基因编辑技术，可准确、高效地检测 microRNA (miRNA)。与传统技术相比，该生物传感器采用独特的均质检测形式，消除了繁琐的探针固定步骤，大大简化了检测过程。通过使用两种扩增技术 - 等温扩增和 T7 RNA 聚合酶扩增 - 生物传感器提高了测定的灵敏度和特异性，在测定中提供出色的检测性能。这使得直接评估各种生物样品（例如细胞裂解物和稀释的人血清）中的 miRNA 成为可能。实验结果令人信服地证明了该生物传感器的非凡性能，包括其极低的检测限（1.27 aM）、高灵敏度、重现性和稳定性。我们构建的传感器在区分癌性和非癌性细胞系方面的应用凸显了其在早期癌症方面的潜力检测和监控。这种创新方法代表了 miRNA 检测领域的重大进步，提供了一种用户友好、经济高效且灵敏的解决方案，对临床诊断和患者护理（特别是在床旁护理环境）具有广泛影响。版权所有 © 2024 Elsevier B.V.保留所有权利。

MicroRNAs (miRNAs) are important non-coding RNA entities that affect gene expression and function by binding to target mRNAs, leading to degradation of the mRNAs or inhibiting their translation. MiRNAs are widely involved in a variety of biological processes, such as cell differentiation, development, metabolism, and apoptosis. In addition, miRNAs are associated with many diseases, including cancer. However, conventional detection techniques often suffer from shortcomings such as low sensitivity, so we need to develop a rapid and efficient detection strategy for accurate detection of miRNAs.We have developed an innovative homogeneous electrochemiluminescence (ECL) biosensor. This biosensor employs CRISPR/Cas12a gene editing technology for accurate and efficient detection of microRNA (miRNA). Compared to conventional technologies, this biosensor employs a unique homogeneous detection format that eliminates laborious probe fixation steps and greatly simplifies the detection process. By using two amplification techniques - isothermal amplification and T7 RNA polymerase amplification - the biosensor improves the sensitivity and specificity of the assay, providing excellent detection performance in the assay. This makes it possible to evaluate miRNA directly from a variety of biological samples such as cell lysates and diluted human serum. Experimental results convincingly demonstrate the extraordinary performance of this biosensor, including its extremely low detection limit of 1.27 aM, high sensitivity, reproducibility and stability.The application of our constructed sensor in distinguishing between cancerous and non-cancerous cell lines highlights its potential for early cancer detection and monitoring. This innovative approach represents a major advancement in the field of miRNA detection, providing a user-friendly, cost-effective, and sensitive solution with broad implications for clinical diagnosis and patient care, especially in point-of-care settings.Copyright © 2024 Elsevier B.V. All rights reserved.