A functionalized magnetic nanoparticle regulated CRISPR-Cas12a sensor for the ultrasensitive detection of alpha-fetoprotein. Issue 14 (14th June 2022)

• Record Type: Journal Article
• Authors: Liu, Ya; Chen, Yan; Zhang, Yue; Zhong, Qi; Zhu, Xiaoli; Wu, Qi
• Is Part Of: Analyst. Volume 147:Issue 14(2022)
• Page Start: 3186
• Page End: 3192
• Publication Date: 2022-06-14
• Subjects: Chemistry, Analytic -- Periodicals; 543
• DOI: 10.1039/d2an00697a
• Languages: English
• ISSNs: 0003-2654

Abstract

Abstract : We report a functionalized magnetic bead separation platform based on the switching aptamer triggered hybridization chain reaction (SAT-HCR) and the CRISPR-Cas12a sensor for the detection of alpha-fetoprotein (AFP) in the serum of hepatoblastoma patients. Abstract : Alpha-fetoprotein (AFP) is an important clinical tumor marker of hepatoblastoma, and the concentration of AFP in serum is closely related to the staging of hepatoblastoma. We report a magnetic bead separation platform based on a switching aptamer triggered hybridization chain reaction (SAT-HCR) and the CRISPR-Cas12a sensor for the in vitro detection of AFP. AFP aptamer, as an easily regulated nucleic acid strand, is responsible for binding to AFP into nucleic acid detection, while HCR-CRISPR-Cas12a, regulated by functionalized magnetic nanoparticles, is responsible for highly specific nucleic acid signal amplification. Under the optimal conditions, the fluorescence intensity was proportional to the concentration of AFP in the range of 0.5–10 4 ng mL −1 and the limit of detection was 0.170 ng mL −1 . In addition, we have successfully applied this biosensor to detect AFP in clinical samples from patients with hepatoblastoma, with greater sensitivity relative to ELISA. Our proposed method showed great potential application in clinical diagnosis and pharmaceutical-related fields with the properties of high sensitivity, low cost and high selectivity.