Abstract
A new biosensing method is presented to detect gene mutation by integrating the MutS protein from bacteria with a fiber optic particle plasmon resonance (FOPPR) sensing system. In this method, the MutS protein is conjugated with gold nanoparticles (AuNPs) deposited on an optical fiber core surface. The target double-stranded DNA containing an A and C mismatched base pair in a sample can be captured by the MutS protein, causing increased absorption of green light launching into the fiber and hence a decrease in transmitted light intensity through the fiber. As the signal change is enhanced through consecutive total internal reflections along the fiber, the limit of detection for an AC mismatch heteroduplex DNA can be as low as 0.49 nM. Because a microfluidic chip is used to contain the optical fiber, the narrow channel width allows an analysis time as short as 15 min. Furthermore, the label-free and real-time nature of the FOPPR sensing system enables determination of binding affinity and kinetics between MutS and single-base mismatched DNA. The method has been validated using a heterozygous PCR sample from a patient to determine the allelic fraction. The obtained allelic fraction of 0.474 reasonably agrees with the expected allelic fraction of 0.5. Therefore, the MutS-functionalized FOPPR sensor may potentially provide a convenient quantitative tool to detect single nucleotide polymorphisms in biological samples with a short analysis time at the point-of-care sites.
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All data generated and analyses during this study are included in this published article and its supplementary material file.
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04 May 2021
A Correction to this paper has been published: https://doi.org/10.1007/s00216-021-03353-0
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Funding
This work was supported by the Ministry of Science and Technology of Taiwan (Grants MOST 105-2113-M-194-009-MY3 and MOST 107-2119-M-194-001) and Center for Nano Bio-Detection from the Featured Research Areas College Development Plan of National Chung Cheng University.
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Conceptualization: Lai-Kwan Chau, Tze-Ta Huang. Methodology: Lai-Kwan Chau, Tze-Ta Huang. Resources: Pao-Lin Kuo. Investigation: Loan Thi Ngo, Wei-Kai Wang. Formal analysis: Loan Thi Ngo, Yen-Ta Tseng, Ting-Chou Chang. Writing-original draft: Loan Thi Ngo, Yen-Ta Tseng. Writing-review and editing: Lai-Kwan Chau, Tze-Ta Huang. Funding acquisition: Lai-Kwan Chau.
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Ngo, L.T., Wang, WK., Tseng, YT. et al. MutS protein-based fiber optic particle plasmon resonance biosensor for detecting single nucleotide polymorphisms. Anal Bioanal Chem 413, 3329–3337 (2021). https://doi.org/10.1007/s00216-021-03271-1
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DOI: https://doi.org/10.1007/s00216-021-03271-1