Super-assembly of integrated gold magnetic assay with loop-mediated isothermal amplification for point-of-care testing

Jianping Liang; Jie Zeng; Xiaojuan Huang; Tengteng Zhu; Yonglong Gong; Chen Dong; Xiangrong Wang; Lingzhi Zhao; Lei Xie; Kang Liang; Qiongxiang Tan; Yali Cui; Biao Kong; Wenli Hui

doi:10.1007/s12274-022-4692-9

Super-assembly of integrated gold magnetic assay with loop-mediated isothermal amplification for point-of-care testing

Nano Res. 2023;16(1):1242-1251. doi: 10.1007/s12274-022-4692-9. Epub 2022 Aug 4.

Authors

Jianping Liang^#¹, Jie Zeng^#², Xiaojuan Huang¹, Tengteng Zhu¹, Yonglong Gong¹, Chen Dong¹, Xiangrong Wang^{1

3}, Lingzhi Zhao¹, Lei Xie², Kang Liang⁴, Qiongxiang Tan¹, Yali Cui^{1

5}, Biao Kong², Wenli Hui^{1

6}

Affiliations

¹ The College of life science, Northwest University, Xi'an, 710069 China.
² Department of Chemistry, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438 China.
³ Provincial Key Laboratory of Biotechnology of Shaanxi Province, Northwest University, Xi'an, 710069 China.
⁴ School of Chemical Engineering, Graduate School of Biomedical Engineering, and Australian Centre for NanoMedicine, University of New South Wales, Sydney, NSW 2052 Australia.
⁵ Shaanxi Provincial Engineering Research Center for Nano-Biomedical Detection, Xi'an, 710077 China.
⁶ Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Northwest University, Xi'an, 710069 China.

^# Contributed equally.

Abstract

With the increasing global threat of various diseases and infections, it is essential to develop a fast, low-cost, and easy-to-use point-of-care testing (POCT) system for inspections at all levels of medical institutions and self-examination at home. In this work, gold magnetic nanoparticles (GMNPs) are used as the key material, and a rapid visual detection method is designed through integrating loop-mediated isothermal amplification (LAMP) and lateral flow assay (LFA) biosensor for detecting a variety of analytes which includes whole blood, buccal swabs, and DNA. It is worth to note that the proposed method does not need DNA extraction. Furthermore, uracil DNA glycosylase (UDG) is employed to eliminate carrier contamination for preventing false positive results. The whole detection process can be finished within 25 min. The accuracy of detection is measured by assessing the polymorphisms of the methylenetetrahydrofolate reductase (MTHFR) C677T. The detection limit of the newly developed extraction-free detection system for MTHFR C677T is 0.16 ng/μL. A preliminary clinical study of the proposed method is carried out by analyzing 600 clinical samples (including 200 whole blood samples, 100 buccal swabs, and 300 genomic DNA samples). The results indicate that the proposed method is 100% consistent with the sequencing results which provides a new choice for POCT and shows a broad application prospect in all levels of medical clinics and at home.

Electronic supplementary material: Supplementary material (details for MTHFR C677T primer sequences, the cell count results of samples at different dilution ratios, genotyping results and frequency samples, a Hardy-Weinberg equilibrium test, the sensitivity of the system, detection results of multiple samples, and optimization of the system) is available in the online version of this article at 10.1007/s12274-022-4692-9.

Keywords: free extraction; gold magnetic nanoparticles; lateral flow assay system; loop-mediated isothermal amplification; single-nucleotide polymorphisms genotyping.