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  4. Amplification curve analysis: Data-driven multiplexing using real-time digital PCR
 
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Amplification curve analysis: Data-driven multiplexing using real-time digital PCR
File(s)
ac-2020-02253x.R2_Proof_hi.pdf (5.64 MB)
Accepted version
Author(s)
Moniri, Ahmad
Miglietta, Luca
Malpartida Cardenas, Kenny
Pennisi, Ivana
Cacho Soblechero, Miguel
more
Type
Journal Article
Abstract
Information about the kinetics of PCR reactions are encoded in the amplification curve. However, in digital PCR (dPCR), this information is typically neglected by collapsing each amplification curve into a binary output (positive/negative). Here, we demonstrate that the large volume of raw data obtained from realtime dPCR instruments can be exploited to perform data-driven multiplexing in a single fluorescent channel using machine learning methods, by virtue of the information in the amplification curve. This new approach, referred to as amplification curve analysis (ACA), was shown using an intercalating dye (EvaGreen), reducing the cost and complexity of the assay and enabling the use of melting curve analysis for validation. As a case study, we multiplexed 3 carbapenem-resistant genes to show the impact of this approach on global challenges such as antimicrobial resistance. In the presence of single targets, we report a classification accuracy of 99.1% (N = 16188) which represents a 19.7% increase compared to multiplexing based on the final fluorescent intensity. Considering all combinations of amplification events (including coamplifications), the accuracy was shown to be 92.9% (N = 10383). To support the analysis, we derived a formula to estimate the occurrence of co-amplification in dPCR based on multivariate Poisson statistics, and suggest reducing the digital occupancy in the case of multiple targets in the same digital panel. The ACA approach takes a step towards maximizing the capabilities of existing real-time dPCR instruments and chemistries, by extracting more information from data to enable data-driven multiplexing with high accuracy. Furthermore, we expect that combining this method with existing probe-based assays will increase multiplexing capabilities significantly. We envision that once emerging point-of-care technologies can reliably capture real-time data from isothermal chemistries, the ACA method will facilitate the implementation of dPCR outside of the lab.
Date Issued
2020-09-18
Date Acceptance
2020-09-03
Citation
Analytical Chemistry, 2020, 92 (19), pp.13134-13143
URI
http://hdl.handle.net/10044/1/82118
URL
https://pubs.acs.org/doi/10.1021/acs.analchem.0c02253
DOI
https://www.dx.doi.org/10.1021/acs.analchem.0c02253
ISSN
0003-2700
Publisher
American Chemical Society
Start Page
13134
End Page
13143
Journal / Book Title
Analytical Chemistry
Volume
92
Issue
19
Copyright Statement
© 2020 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Anal. Chem., after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.analchem.0c02253
Sponsor
Imperial College Healthcare NHS Trust- BRC Funding
National Institute for Health Research
National Institute for Health Research
Identifier
https://pubs.acs.org/doi/10.1021/acs.analchem.0c02253
Grant Number
RDA02
HPRU-2012-10047
HPRU-2012-10047
Subjects
0301 Analytical Chemistry
0399 Other Chemical Sciences
Analytical Chemistry
Publication Status
Published
Date Publish Online
2020-09-18
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