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Wittwer CT, Hemmert AC, Kent JO, Rejali NA. DNA melting analysis. Mol Aspects Med 2024; 97:101268. [PMID: 38489863 DOI: 10.1016/j.mam.2024.101268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 02/19/2024] [Accepted: 03/11/2024] [Indexed: 03/17/2024]
Abstract
Melting is a fundamental property of DNA that can be monitored by absorbance or fluorescence. PCR conveniently produces enough DNA to be directly monitored on real-time instruments with fluorescently labeled probes or dyes. Dyes monitor the entire PCR product, while probes focus on a specific locus within the amplicon. Advances in amplicon melting include high resolution instruments, saturating DNA dyes that better reveal multiple products, prediction programs for domain melting, barcode taxonomic identification, high speed microfluidic melting, and highly parallel digital melting. Most single base variants and small insertions or deletions can be genotyped by high resolution amplicon melting. High resolution melting also enables heterozygote scanning for any variant within a PCR product. A web application (uMelt, http://www.dna-utah.org) predicts amplicon melting curves with multiple domains, a useful tool for verifying intended products. Additional applications include methylation assessment, copy number determination and verification of sequence identity. When amplicon melting does not provide sufficient detail, unlabeled probes or snapback primers can be used instead of covalently labeled probes. DNA melting is a simple, inexpensive, and powerful tool with many research applications that is beginning to make its mark in clinical diagnostics.
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Affiliation(s)
- Carl T Wittwer
- Department of Pathology, University of Utah, Salt Lake City, UT, USA.
| | | | - Jana O Kent
- Department of Pathology, University of Utah, Salt Lake City, UT, USA
| | - Nick A Rejali
- Department of Pathology, University of Utah, Salt Lake City, UT, USA
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Wittwer CT. Rapid Cycle and Extreme Polymerase Chain Reaction. Methods Mol Biol 2023; 2621:257-266. [PMID: 37041449 DOI: 10.1007/978-1-0716-2950-5_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
Rapid cycle polymerase chain reaction (PCR) amplifies DNA in 10-30 min, while extreme PCR is complete in less than 1 min. These methods do not sacrifice quality for speed; sensitivity, specificity, and yield are equivalent or better than conventional PCR. What is required (and not widely available) is rapid, accurate control of reaction temperature during cycling. Specificity improves with cycling speed, and efficiency can be maintained by increasing polymerase and primer concentrations. Speed is aided by simplicity, dyes that stain double-stranded DNA are less expensive than probes, and one of the simplest polymerases, the deletion mutant KlenTaq, is used throughout. Rapid amplification can be coupled with endpoint melting analysis to verify product identity. Instead of commercial master mixes, detailed formulations for reagents and master mixes compatible with rapid cycle and extreme PCR are described.
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Zhang L, Liu D, Li B, Xie J, Liu J, Zhang Z. Single nucleotide polymorphism genotyping of ALDH2 gene based on asymmetric PCR and fluorescent probe-mediated melting curves. Anal Biochem 2021; 642:114509. [PMID: 34864041 DOI: 10.1016/j.ab.2021.114509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 11/25/2021] [Accepted: 11/27/2021] [Indexed: 11/15/2022]
Abstract
Detection of single nucleotide polymorphisms (SNPs) is of great value in precision medicine. The polymorphism of the aldehyde dehydrogenase 2 (ALDH2) gene is caused by a G1510A transition, resulting in the substitution of glutamic acid by lysine at position 487. People of different ALDH2 genotypes show different susceptibility to cancer, metabolic diseases, etc. SNP analysis based on fluorescent probe-mediated melting curves is a relatively efficient and cost-effective method. Genomic DNA extracted from 100 whole blood samples was subjected to polymorphisms mutational analysis using asymmetric PCR and probe-mediated melting curves. Then a certain number of samples from each genotype were randomly selected for direct sequencing verification. The new assay can be performed in 2 h without post-PCR processing such as gel electrophoresis and validated by direct sequencing in a blind study with 100% concordance. Moreover, comparing the detection of polymorphisms of ALDH2 with the clinics, and an overall agreement of 100% (100/100) was demonstrated. Our study has shown a high level of concordance between DNA sequencing, which is suitable for the detection of clinical specimens. Based on the concept of probe-mediated melting curves, we further developed this platform as a universal strategy for the detection of polymorphisms related to folate metabolism.
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Affiliation(s)
- Limei Zhang
- Department of Laboratory Medicine, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, PR China
| | - Dan Liu
- Department of Clinical Laboratory, Zigong Fourth People' Hospital, Zigong, 643099, PR China
| | - Baolin Li
- Department of Laboratory Medicine, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, PR China
| | - Jingling Xie
- Department of Laboratory Medicine, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, PR China
| | - Jinbo Liu
- Department of Laboratory Medicine, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, PR China.
| | - Zhang Zhang
- Department of Laboratory Medicine, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, PR China; Key Laboratory of Laboratory Medical Diagnostics of Education, Department of Laboratory Medicine, Chongqing Medical University, Chongqing, 400010, PR China.
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Rejali NA, Ye FD, Zuiter AM, Keller CC, Wittwer CT. Nearest-neighbour transition-state analysis for nucleic acid kinetics. Nucleic Acids Res 2021; 49:4574-4585. [PMID: 33823552 PMCID: PMC8096236 DOI: 10.1093/nar/gkab205] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 02/24/2021] [Accepted: 03/13/2021] [Indexed: 11/13/2022] Open
Abstract
We used stopped-flow to monitor hypochromicity for 43 oligonucleotide duplexes to study nucleic acid kinetics and extract transition-state parameters for association and dissociation. Reactions were performed in 1.0 M NaCl (for literature comparisons) and 2.2 mM MgCl2 (PCR conditions). Dissociation kinetics depended on sequence, increased exponentially with temperature, and transition-state parameters inversely correlated to thermodynamic parameters (r = -0.99). Association had no consistent enthalpic component, varied little with temperature or sequence, and poorly correlated to thermodynamic parameters (r = 0.28). Average association rates decreased 78% in MgCl2 compared to NaCl while dissociation was relatively insensitive to ionic conditions. A nearest-neighbour kinetic model for dissociation predicted rate constants within 3-fold of literature values (n = 11). However, a nearest-neighbour model for association appeared overparameterized and inadequate for predictions. Kinetic predictions were used to simulate published high-speed (<1 min) melting analysis and extreme (<2 min) PCR experiments. Melting simulations predicted apparent melting temperatures increase on average 2.4°C when temperature ramp rates increased from 0.1 to 32°C/s, compared to 2.8°C reported in the literature. PCR simulations revealed that denaturation kinetics are dependent on the thermocycling profile. Simulations overestimated annealing efficiencies at shorter annealing times and suggested that polymerase interactions contribute to primer-template complex stability at extension temperatures.
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Affiliation(s)
- Nick A Rejali
- Department of Pathology, University of Utah, Salt Lake City, UT 84132, USA
| | - Felix D Ye
- Department of Pathology, University of Utah, Salt Lake City, UT 84132, USA
| | - Aisha M Zuiter
- Department of Pathology, University of Utah, Salt Lake City, UT 84132, USA
| | - Caroline C Keller
- Department of Pathology, University of Utah, Salt Lake City, UT 84132, USA
| | - Carl T Wittwer
- Department of Pathology, University of Utah, Salt Lake City, UT 84132, USA
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Zhang K, Deng R, Gao H, Teng X, Li J. Lighting up single-nucleotide variation in situ in single cells and tissues. Chem Soc Rev 2020; 49:1932-1954. [PMID: 32108196 DOI: 10.1039/c9cs00438f] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The ability to 'see' genetic information directly in single cells can provide invaluable insights into complex biological systems. In this review, we discuss recent advances of in situ imaging technologies for visualizing the subtlest sequence alteration, single-nucleotide variation (SNV), at single-cell level. The mechanism of recently developed methods for SNV discrimination are summarized in detail. With recent developments, single-cell SNV imaging methods have opened a new door for studying the heterogenous and stochastic genetic information in individual cells. Furthermore, SNV imaging can be used on morphologically preserved tissue, which can provide information on histological context for gene expression profiling in basic research and genetic diagnosis. Moreover, the ability to visualize SNVs in situ can be further developed into in situ sequencing technology. We expect this review to inspire more research work into in situ SNV imaging technologies for investigating cellular phenotypes and gene regulation at single-nucleotide resolution, and developing new clinical and biomedical applications.
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Affiliation(s)
- Kaixiang Zhang
- Department of Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Tsinghua University, Beijing 100084, China. and School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, China
| | - Ruijie Deng
- Department of Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Tsinghua University, Beijing 100084, China.
| | - Hua Gao
- Department of Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Tsinghua University, Beijing 100084, China. and Department of Pathogeny Biology, Medical College, Zhengzhou University, Zhengzhou 450001, China
| | - Xucong Teng
- Department of Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Tsinghua University, Beijing 100084, China.
| | - Jinghong Li
- Department of Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Tsinghua University, Beijing 100084, China.
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Ruijter JM, Ruiz-Villalba A, van den Hoff AJJ, Gunst QD, Wittwer CT, van den Hoff MJB. Removal of artifact bias from qPCR results using DNA melting curve analysis. FASEB J 2019; 33:14542-14555. [PMID: 31682470 DOI: 10.1096/fj.201901604r] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Quantitative PCR (qPCR) allows the precise measurement of DNA concentrations and is generally considered to be straightforward and trouble free. However, analyses using validated Sybr Green I-based assays regularly amplify both the correct product and an artifact. Amplification of more than 1 product can be recognized when melting curve analysis is performed after the qPCR. Currently, such reactions need to be excluded from further analysis because the quantification result is considered meaningless. However, when the fraction of the fluorescence associated with the correct product can be determined, the quantitative result of the qPCR analysis can be corrected. The main assumptions of this correction model are: 1) the melting peak of the correct product can be identified, 2) the PCR efficiencies of all amplified products are similar, 3) the relative size of the melting peaks reflects the relative concentrations of the products, and 4) the relative concentrations do not change as the reaction reaches plateau. These assumptions were validated in a series of model experiments. The results show that the quantitative results can be corrected. Implementation of a correction for the presence of artifact amplification in the analysis of qPCR data leads to more reliable quantitative results in qPCR experiments.-Ruijter, J. M., Ruiz-Villalba, A., van den Hoff, A. J. J., Gunst, Q. D., Wittwer, C. T., van den Hoff, M. J. B. Removal of artifact bias from qPCR results using DNA melting curve analysis.
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Affiliation(s)
- Jan M Ruijter
- Department of Medical Biology, Amsterdam University Medical Centers, Academic Medical Center (AMC), Amsterdam, The Netherlands
| | - Adrian Ruiz-Villalba
- Department of Medical Biology, Amsterdam University Medical Centers, Academic Medical Center (AMC), Amsterdam, The Netherlands.,Centre for Applied Medical Research (CIMA), University of Navarra, Pamplona, Spain; and
| | - Axel J J van den Hoff
- Department of Medical Biology, Amsterdam University Medical Centers, Academic Medical Center (AMC), Amsterdam, The Netherlands
| | - Quinn D Gunst
- Department of Medical Biology, Amsterdam University Medical Centers, Academic Medical Center (AMC), Amsterdam, The Netherlands
| | - Carl T Wittwer
- Department of Pathology, University of Utah Medical School, Salt Lake City, Utah, USA
| | - Maurice J B van den Hoff
- Department of Medical Biology, Amsterdam University Medical Centers, Academic Medical Center (AMC), Amsterdam, The Netherlands
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Abstract
Advances in nucleic acid sequencing and genotyping technologies have facilitated the discovery of an increasing number of single-nucleotide variations (SNVs) associated with disease onset, progression, and response to therapy. The reliable detection of such disease-specific SNVs can ensure timely and effective therapeutic action, enabling precision medicine. This has driven extensive efforts in recent years to develop novel methods for the fast and cost-effective analysis of targeted SNVs. In this Review, we highlight the most recent and significant advances made toward the development of such methodologies.
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Affiliation(s)
- Alireza Abi
- Department of Chemistry, Faculty of Sciences, Shiraz University, Shiraz 7194684795, Iran
| | - Afsaneh Safavi
- Department of Chemistry, Faculty of Sciences, Shiraz University, Shiraz 7194684795, Iran
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The kinetic requirements of extreme qPCR. BIOMOLECULAR DETECTION AND QUANTIFICATION 2019; 17:100081. [PMID: 31285997 PMCID: PMC6591793 DOI: 10.1016/j.bdq.2019.100081] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 01/31/2019] [Accepted: 02/07/2019] [Indexed: 01/02/2023]
Abstract
The kinetic requirements of quantitative PCR were experimentally dissected into the stages of DNA denaturation, primer annealing, and polymerase extension. The temperature/time conditions for 2 stages were kept optimal, while the other was limited until the amplification efficiency decreased as measured by an increase in quantification cycle (Cq). Extension was studied in a commercial capillary LightCycler®. Using a rapid deletion mutant of Taq (KlenTaq™), about 1 s was required for every 70 bp of product length. To study annealing and denaturation times of <1 s, a custom “extreme” PCR instrument with 3 temperatures was used along with increased primer and polymerase concentrations. Actual sample temperatures and times were measured rather than programmed or predicted. For denaturation, 200–500 ms above the denaturation threshold was necessary for maximal efficiency. For annealing, 300-1000 ms below the annealing threshold was required. Temperature thresholds were set at 98% primer annealing or PCR product denaturation as determined experimentally by melting curves. Progressing from rapid cycle PCR to extreme PCR decreased cycling times by 10–60 fold. If temperatures are controlled accurately and flexibility in reagents is allowed, PCR of short products can be performed in less than 15 s. We also put PCR in context to other emerging methods and consider its relevance to the evolution of molecular diagnostics.
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Makrigiorgos GM. Extreme PCR Meets High-Speed Melting: A Step Closer to Molecular Diagnostics "While You Wait". Clin Chem 2018; 65:217-219. [PMID: 30530717 DOI: 10.1373/clinchem.2018.298356] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 11/20/2018] [Indexed: 12/19/2022]
Affiliation(s)
- G Mike Makrigiorgos
- Department of Radiation Oncology, Dana-Farber Cancer Institute and Brigham and Women's Hospital, Harvard Medical School, Boston, MA.
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Myrick JT, Pryor RJ, Palais RA, Ison SJ, Sanford L, Dwight ZL, Huuskonen JJ, Sundberg SO, Wittwer CT. Integrated Extreme Real-Time PCR and High-Speed Melting Analysis in 52 to 87 Seconds. Clin Chem 2018; 65:263-271. [PMID: 30459167 DOI: 10.1373/clinchem.2018.296608] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Accepted: 10/15/2018] [Indexed: 11/06/2022]
Abstract
BACKGROUND Extreme PCR in <30 s and high-speed melting of PCR products in <5 s are recent advances in the turnaround time of DNA analysis. Previously, these steps had been performed on different specialized instruments. Integration of both extreme PCR and high-speed melting with real-time fluorescence monitoring for detection and genotyping is presented here. METHODS A microfluidic platform was enhanced for speed using cycle times as fast as 1.05 s between 66.4 °C and 93.7 °C, with end point melting rates of 8 °C/s. Primer and polymerase concentrations were increased to allow short cycle times. Synthetic sequences were used to amplify fragments of hepatitis B virus (70 bp) and Clostridium difficile (83 bp) by real-time PCR and high-speed melting on the same instrument. A blinded genotyping study of 30 human genomic samples at F2 c.*97, F5 c.1601, MTHFR c.665, and MTHFR c.1286 was also performed. RESULTS Standard rapid-cycle PCR chemistry did not produce any product when total cycling times were reduced to <1 min. However, efficient amplification was possible with increased primer (5 μmol/L) and polymerase (0.45 U/μL) concentrations. Infectious targets were amplified and identified in 52 to 71 s. Real-time PCR and genotyping of single-nucleotide variants from human DNA was achieved in 75 to 87 s and was 100% concordant to known genotypes. CONCLUSIONS Extreme PCR with high-speed melting can be performed in about 1 min. The integration of extreme PCR and high-speed melting shows that future molecular assays at the point of care for identification, quantification, and variant typing are feasible.
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Affiliation(s)
| | - Robert J Pryor
- Department of Pathology, University of Utah Health Sciences Center, Salt Lake City, UT
| | - Robert A Palais
- Department of Pathology, University of Utah Health Sciences Center, Salt Lake City, UT.,Department of Mathematics, Utah Valley University, Orem, UT
| | | | | | - Zachary L Dwight
- Department of Pathology, University of Utah Health Sciences Center, Salt Lake City, UT
| | | | - Scott O Sundberg
- Canon Virginia, Inc., Newport News, VA.,Canon US Life Sciences, Inc., Rockville, MD
| | - Carl T Wittwer
- Department of Pathology, University of Utah Health Sciences Center, Salt Lake City, UT;
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Cai Q, Fauvart M, Wiederkehr RS, Jones B, Cools P, Goos P, Vaneechoutte M, Stakenborg T. Ultra-fast, sensitive and quantitative on-chip detection of group B streptococci in clinical samples. Talanta 2018; 192:220-225. [PMID: 30348381 DOI: 10.1016/j.talanta.2018.09.041] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 09/04/2018] [Accepted: 09/11/2018] [Indexed: 12/29/2022]
Abstract
PCR enables sensitive and specific detection of infectious disease agents, but application in point-of-care diagnostic testing remains scarce. A compact tool that runs PCR assays in less than a few minutes and that relies on mass-producible, disposable reactors could revolutionize while-you-wait molecular testing. We here exploit well-established semiconductor manufacturing processes to produce silicon ultra-fast quantitative PCR (UF-qPCR) chips that can run PCR protocols with limited assay optimization. A total of 110 clinical samples were analyzed for the detection of group B streptococci using both a validated benchtop and an on-chip qPCR assay. For the on-chip assay, the total reaction time was reduced after optimization to less than 5 min. The standard curve, spanning a concentration range of 5 log units, yielded a PCR efficiency of 94%. The sensitivity obtained was 96% (96/100; CI: 90-98%) and the specificity 70% (7/10; CI: 40-90%). We show that if melting analyses would be integrated, the obtained sensitivity would drop slightly to 93% (CI: 86-96%), while the specificity would increase to 100% (CI: 72% - 100%). In comparison to the benchtop reference qPCR assay performed on a LightCycler©96, the on-chip assay demonstrated a highly significant qualitative (Spearman's rank correlation) and quantitative (linear regression) correlation. Using a mass-producible qPCR chip and limited assay optimization, we were able to develop a validated qPCR protocol that can be carried out in less than five minutes. The analytical performance of the microchip-based UF-qPCR system was shown to match that of a benchtop assay. This is the first report to provide UF-qPCR validation using clinical samples. We demonstrate that qPCR-based while-you-wait testing is feasible without jeopardizing assay performance.
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Affiliation(s)
- Qing Cai
- Imec, Kapeldreef 75, B-3001 Leuven, Belgium
| | | | | | | | - Piet Cools
- Laboratory for Bacteriology Research, Department of Clinical Chemistry, Microbiology and Immunology, Ghent University, Heymanslaan 10 185, Entrance 38 (MRB2), 9000 Gent, Belgium
| | - Peter Goos
- Division of Mechatronics, Biostatistics and Sensors (MeBioS), KU Leuven Kasteelpark Arenberg 30 - bus 2456, 3001 Leuven, Belgium; Department of Engineering Management, University of Antwerp, 2000 Antwerpen, Belgium
| | - Mario Vaneechoutte
- Laboratory for Bacteriology Research, Department of Clinical Chemistry, Microbiology and Immunology, Ghent University, Heymanslaan 10 185, Entrance 38 (MRB2), 9000 Gent, Belgium
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Wang P, Kricka LJ. Current and Emerging Trends in Point-of-Care Technology and Strategies for Clinical Validation and Implementation. Clin Chem 2018; 64:1439-1452. [PMID: 29884677 DOI: 10.1373/clinchem.2018.287052] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 05/11/2018] [Indexed: 12/14/2022]
Abstract
BACKGROUND Point-of-care technology (POCT) provides actionable information at the site of care to allow rapid clinical decision-making. With healthcare emphasis shifting toward precision medicine, population health, and chronic disease management, the potential impact of POCT continues to grow, and several prominent POCT trends have emerged or strengthened in the last decade. CONTENT This review summarizes current and emerging trends in POCT, including technologies approved or cleared by the Food and Drug Administration or in development. Technologies included have either impacted existing clinical diagnostics applications (e.g., continuous monitoring and targeted nucleic acid testing) or are likely to impact diagnostics delivery in the near future. The focus is limited to in vitro diagnostics applications, although in some sections, technologies beyond in vitro diagnostics are also included given the commonalities (e.g., ultrasound plug-ins for smart phones). For technologies in development (e.g., wearables, noninvasive testing, mass spectrometry and nuclear magnetic resonance, paper-based diagnostics, nanopore-based devices, and digital microfluidics), we also discuss their potential clinical applications and provide perspectives on strategies beyond technological and analytical proof of concept, with the end goal of clinical implementation and impact. SUMMARY The field of POCT has witnessed strong growth over the past decade, as evidenced by new clinical or consumer products or research and development directions. Combined with the appropriate strategies for clinical needs assessment, validation, and implementation, these and future POCTs may significantly impact care delivery and associated outcomes and costs.
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Affiliation(s)
- Ping Wang
- William Pepper Laboratory, University of Pennsylvania Heath System, and the Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA.
| | - Larry J Kricka
- William Pepper Laboratory, University of Pennsylvania Heath System, and the Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
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Li M, Palais R, Zhou L, Wittwer C. Quantifying variant differences in DNA melting curves: Effects of length, melting rate, and curve overlay. Anal Biochem 2017; 539:90-95. [DOI: 10.1016/j.ab.2017.10.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2017] [Revised: 10/12/2017] [Accepted: 10/19/2017] [Indexed: 11/30/2022]
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