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Wen XH, Han YL, Cao XS, Zhao W, Yan Z, Yan L, Wen JX, Hu ZD, Zheng WQ. Diagnostic value of nucleic acid amplification tests for tuberculous pleural effusion. Future Microbiol 2023; 18:971-983. [PMID: 37702019 DOI: 10.2217/fmb-2023-0025] [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] [Indexed: 09/14/2023] Open
Abstract
Diagnosing tuberculous pleural effusion (TPE) is challenging for pulmonologists and laboratory scientists. The gold standards for TPE diagnosis are pleural fluid Ziehl-Neelsen staining, Mycobacterium tuberculosis (Mtb) culture and pleural biopsy. These tools have limitations, including low sensitivity, long turnaround time and invasiveness. The nucleic acid amplification test (NAAT) is a rapid and minimally invasive tool for diagnosing TPE. This review summarizes the diagnostic accuracy of available NAATs for TPE, with a focus on the evidence from systematic reviews and meta-analyses. The NAATs summarized in this review include in-house NAATs, GeneXpert-MTB/RIF, GeneXpert-MTB/RIF Ultra, simultaneous amplification and testing-tuberculosis, FluoroType MTB and loop-mediated isothermal amplification.
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Affiliation(s)
- Xu-Hui Wen
- Department of Laboratory Medicine, the Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010010, China
- Department of Parasitology, Basic Medical Sciences College of Inner Mongolia Medical University, Hohhot, 010050, China
| | - Yu-Ling Han
- Department of Laboratory Medicine, the Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010010, China
- Department of Parasitology, Basic Medical Sciences College of Inner Mongolia Medical University, Hohhot, 010050, China
| | - Xi-Shan Cao
- Department of Laboratory Medicine, the Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010010, China
| | - Wen Zhao
- Department of Laboratory Medicine, the Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010010, China
| | - Zhi Yan
- Department of Laboratory Medicine, the Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010010, China
- Department of Parasitology, Basic Medical Sciences College of Inner Mongolia Medical University, Hohhot, 010050, China
| | - Li Yan
- Department of Respiratory & Critical Care Medicine, the Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010010, China
| | - Jian-Xun Wen
- Department of Medical Experiment Center, Basic Medical Sciences College of Inner Mongolia Medical University, Hohhot, 010050, China
| | - Zhi-De Hu
- Department of Laboratory Medicine, the Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010010, China
| | - Wen-Qi Zheng
- Department of Laboratory Medicine, the Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010010, China
- Department of Parasitology, Basic Medical Sciences College of Inner Mongolia Medical University, Hohhot, 010050, China
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2
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Innovations in Molecular Identification of Mycobacterium tuberculosis. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2022. [DOI: 10.22207/jpam.16.1.76] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Tuberculosis (TB) continues to be a significant public health concern on a global scale. Quick and precise identification of Mycobacterium tuberculosis (MTB) in symptomatic patients is pivotal for worldwide TB eradication initiatives. As an infectious disorder induced by MTB, it remains a critical threat to public health, particularly in poor countries, due to an inadequate diagnostic research laboratory. There is a need for a persistent incentive to reduce response time for effective diagnosis and control of TB infection, which is a benefit that molecular techniques provide over traditional methods. Although there is a tremendous overall prevalence of TB and a relatively poor probability of case identification worldwide. Common screening techniques have focused on tests that have many fundamental shortcomings. Due to the development of antibiotic-resistant Mycobacterium strains, TB is one of the leading contributors to fatalities. It is now possible to examine TB using molecular detection techniques, which are faster and more cost-effective than previous methods, such as standard culture procedures to test and verify antibiotic resistance in patients with TB. Whole genome sequencing (WGS), faster nucleic acid amplification tests, has made it easier to diagnose and treat TB more quickly. This article addresses the genetic approaches for detecting Mycobacterium tuberculosis complex (MTBC) in clinical specimens as well as antibiotic resistance in mycobacterium and discusses the practical limitations of using these methods.
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Ooi KH, Liu MM, Moo JR, Nimsamer P, Payungporn S, Kaewsapsak P, Tan MH. A Sensitive and Specific Fluorescent RT-LAMP Assay for SARS-CoV-2 Detection in Clinical Samples. ACS Synth Biol 2022; 11:448-463. [PMID: 34981924 DOI: 10.1021/acssynbio.1c00538] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The raging COVID-19 pandemic has created an unprecedented demand for frequent and widespread testing to limit viral transmission. Reverse transcription loop-mediated isothermal amplification (RT-LAMP) has emerged as a promising diagnostic platform for rapid detection of SARS-CoV-2, in part because it can be performed with simple instrumentation. However, isothermal amplification methods frequently yield spurious amplicons even in the absence of a template. Consequently, RT-LAMP assays can produce false positive results when they are based on generic intercalating dyes or pH-sensitive indicators. Here, we report the development of a sensitive RT-LAMP assay that leverages on a novel sequence-specific probe to guard against spurious amplicons. We show that our optimized fluorescent assay, termed LANTERN, takes only 30 min to complete and can be applied directly on swab or saliva samples. Furthermore, utilizing clinical RNA samples from 52 patients with COVID-19 infection and 21 healthy individuals, we demonstrate that our diagnostic test exhibits a specificity and positive predictive value of 95% with a sensitivity of 8 copies per reaction. Hence, our new probe-based RT-LAMP assay can serve as an inexpensive method for point-of-need diagnosis of COVID-19 and other infectious diseases.
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Affiliation(s)
- Kean Hean Ooi
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 637459 Singapore
- Genome Institute of Singapore, Agency for Science Technology and Research, 138672 Singapore
| | - Mengying Mandy Liu
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 637459 Singapore
- Genome Institute of Singapore, Agency for Science Technology and Research, 138672 Singapore
| | - Jia Rong Moo
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 637459 Singapore
- School of Biological Sciences, Nanyang Technological University, 637551 Singapore
| | - Pattaraporn Nimsamer
- Research Unit of Systems Microbiology, Department of Biochemistry, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Sunchai Payungporn
- Research Unit of Systems Microbiology, Department of Biochemistry, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Pornchai Kaewsapsak
- Research Unit of Systems Microbiology, Department of Biochemistry, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Meng How Tan
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 637459 Singapore
- Genome Institute of Singapore, Agency for Science Technology and Research, 138672 Singapore
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4
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Bai C, Klimkowski P, Jin C, Kuchlyan J, El-Sagheer AH, Brown T. A new phosphoramidite enables orthogonal double labelling to form combination oligonucleotide probes. Org Biomol Chem 2022; 20:8618-8622. [DOI: 10.1039/d2ob01899c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A novel phosphoramidite (AP-C3 dT) containing an alkyne and amine has been synthesized, enabling orthogonal labelling for combination oligonucleotides probes.
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Affiliation(s)
- Chunsen Bai
- Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
| | - Piotr Klimkowski
- Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
| | - Cheng Jin
- Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
| | - Jagannath Kuchlyan
- Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
| | - Afaf H. El-Sagheer
- Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
- Chemistry Branch, Department of Science and Mathematics, Faculty of Petroleum and Mining Engineering, Suez University, Suez 43721, Egypt
| | - Tom Brown
- Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
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Sijen T, Harbison S. On the Identification of Body Fluids and Tissues: A Crucial Link in the Investigation and Solution of Crime. Genes (Basel) 2021; 12:1728. [PMID: 34828334 PMCID: PMC8617621 DOI: 10.3390/genes12111728] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 10/26/2021] [Accepted: 10/26/2021] [Indexed: 12/13/2022] Open
Abstract
Body fluid and body tissue identification are important in forensic science as they can provide key evidence in a criminal investigation and may assist the court in reaching conclusions. Establishing a link between identifying the fluid or tissue and the DNA profile adds further weight to this evidence. Many forensic laboratories retain techniques for the identification of biological fluids that have been widely used for some time. More recently, many different biomarkers and technologies have been proposed for identification of body fluids and tissues of forensic relevance some of which are now used in forensic casework. Here, we summarize the role of body fluid/ tissue identification in the evaluation of forensic evidence, describe how such evidence is detected at the crime scene and in the laboratory, elaborate different technologies available to do this, and reflect real life experiences. We explain how, by including this information, crucial links can be made to aid in the investigation and solution of crime.
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Affiliation(s)
- Titia Sijen
- Division Human Biological Traces, Netherlands Forensic Institute, Laan van Ypenburg 6, 2497 GB The Hague, The Netherlands
- Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - SallyAnn Harbison
- Institute of Environmental Science and Research Limited, Private Bag 92021, Auckland 1142, New Zealand;
- Department of Statistics, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Mampunye L, van der Merwe NC, Grant KA, Peeters AV, Torrorey-Sawe R, French DJ, Moremi KE, Kidd M, van Eeden PC, Pienaar FM, Kotze MJ. Pioneering BRCA1/2 Point-Of-Care Testing for Integration of Germline and Tumor Genetics in Breast Cancer Risk Management: A Vision for the Future of Translational Pharmacogenomics. Front Oncol 2021; 11:619817. [PMID: 34660253 PMCID: PMC8513538 DOI: 10.3389/fonc.2021.619817] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Accepted: 08/31/2021] [Indexed: 11/13/2022] Open
Abstract
Research performed in South African (SA) breast, ovarian and prostate cancer patients resulted in the development of a rapid BRCA point-of-care (POC) assay designed as a time- and cost-effective alternative to laboratory-based technologies currently used for first-tier germline DNA testing. In this study the performance of the new assay was evaluated for use on a portable screening device (ParaDNA), with the long-term goal to enable rollout at POC as an inventive step to meet the World Health Organization’s sustainable development goals for Africa. DNA samples for germline testing were obtained retrospectively from 50 patients with early-stage hormone receptor-positive breast cancer referred for genomic tumor profiling (MammaPrint). Currently, SA patients with the luminal-type breast cancer are not routinely selected for BRCA1/2 testing as is the case for triple-negative disease. An initial evaluation involved the use of multiple control samples representing each of the pathogenic founder/recurrent variants included in the BRCA 1.0 POC Research Assay. Comparison with a validated laboratory-based first-tier real-time polymerase chain reaction (PCR) assay demonstrated 100% concordance. Clinical utility was evident in five patients with the founder BRCA2 c.7934delG variant, identified at the 10% (5/50) threshold considered cost-effective for BRCA1/2 testing. BRCA2 c.7934delG carrier status was associated with a significantly younger age (p=0.03) at diagnosis of breast cancer compared to non-carriers. In three of the BRCA2 c.7934delG carriers a high-risk MammaPrint 70-gene profile was noted, indicating a significantly increased risk for both secondary cancers and breast cancer recurrence. Initiating germline DNA testing at the POC for clinical interpretation early in the treatment planning process, will increase access to the most common pathogenic BRCA1/2 variants identified in SA and reduce loss to follow-up for timely gene-targeted risk reduction intervention. The ease of using cheek swabs/saliva in future for result generation within approximately one hour assay time, coupled with low cost and a high BRCA1/2 founder variant detection rate, will improve access to genomic medicine in Africa. Application of translational pharmacogenomics across ethnic groups, irrespective of age, family history, tumor subtype or recurrence risk profile, is imperative to sustainably implement preventative healthcare and improve clinical outcome in resource-constrained clinical settings.
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Affiliation(s)
- Lwando Mampunye
- Division of Chemical Pathology, Department of Pathology, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.,Department of Biomedical Sciences, Faculty of Health and Wellness, Cape Peninsula University of Technology, Cape Town, South Africa
| | - Nerina C van der Merwe
- Division of Human Genetics, National Health Laboratory Service, Universitas Hospital, Bloemfontein, South Africa.,Division of Human Genetics, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa
| | - Kathleen A Grant
- Department of Biomedical Sciences, Faculty of Health and Wellness, Cape Peninsula University of Technology, Cape Town, South Africa
| | - Armand V Peeters
- Division of Chemical Pathology, Department of Pathology, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - Rispah Torrorey-Sawe
- Division of Chemical Pathology, Department of Pathology, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.,Immunology Department, School of Medicine, College of Health Sciences, Moi University, Eldoret, Kenya
| | - David J French
- Division of Health Science and Innovation, LGC Limited, Teddington, United Kingdom
| | - Kelebogile E Moremi
- Division of Chemical Pathology, Department of Pathology, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - Martin Kidd
- Centre for Statistical Consultation, University of Stellenbosch, Stellenbosch, South Africa
| | | | | | - Maritha J Kotze
- Division of Chemical Pathology, Department of Pathology, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.,Division of Chemical Pathology, National Health Laboratory Service, Tygerberg Hospital, Cape Town, South Africa
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Kim YT, Moon J, Hong IS. Simultaneous Detection of Multiple Pathogenic Targets with Stem-Tagged Primer Sets. Chembiochem 2020; 21:1116-1120. [PMID: 31705704 DOI: 10.1002/cbic.201900668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Indexed: 11/07/2022]
Abstract
Simultaneous multiple gene detection is indispensable for the detection of various genes in a small sample obtained by an invasive method. A typical detection method is probe-based fluorescence melting curve analysis by means of real-time PCR. It is very limited because, for each target, a probe sequence with at least a different Tm must be designed. To overcome this limitation, we developed a simultaneous multiple gene detection method based on a giant amplicon molecular beacon. PCR was performed by attaching stem sequences with different Tm values to each primer set, and the melting Tm was measured by hybridizing the stem sequences at both ends of the amplified amplicon; this generated well-separated Tm signals. The important point here is that the stem sequence that produces the Tm signal is an arbitrarily selectable sequence unrelated to the target gene. Because it is arbitrarily selectable, the desired Tm can be freely adjusted. As a result, we succeeded in the simultaneous detection of four samples with the use of only one fluorophore. Theoretically, a combination of five fluorophores could detect more than 20 multiple genes simultaneously.
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Affiliation(s)
- Yong-Tae Kim
- Department of Chemistry, College of Natural Science, Kongju National University, 56, Gongjudaehak-ro, Gongju-si, Chungnam, 32588, Republic of Korea
| | - Junhye Moon
- Research Institute, Sejong Medical Co. Ltd., 11, Sinchon 2-ro, Paju-si, Gyeonggi-do, 10880, Republic of Korea
| | - In Seok Hong
- Department of Chemistry, College of Natural Science, Kongju National University, 56, Gongjudaehak-ro, Gongju-si, Chungnam, 32588, Republic of Korea
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8
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Li M, Tao R, Zhou W, Li Y, Meng M, Zhang Y, Yu L, Chen L, Bian Y, Li C. Validation studies of the ParaDNA ® Intelligence System with artificial evidence items. Forensic Sci Res 2019; 6:84-91. [PMID: 34007520 PMCID: PMC8110186 DOI: 10.1080/20961790.2019.1665159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Short tandem repeat (STR) profiling is one of the mostly used systems for forensic applications. In certain circumstances, STR profiling is time-consuming and costly, which potentially leads to delays in criminal investigations. LGC (Laboratory of the Government Chemist, UK) Forensics has developed a robust STR profiling platform called the ParaDNA® Intelligence Test System which can provide early tactical intelligence and aid investigators in making informed decisions on sample prioritization for detection. Here, we validated the ParaDNA intelligence test for its application in forensic cases using a range of mock evidence items following guidelines set by the Scientific Working Group on DNA Analysis Methods (SWGDAM). Specifically, we tested the sensitivity and accuracy of the ParaDNA intelligence test, as well as the success rates for detecting mock samples and for use in case scenarios. Our findings demonstrate that the ParaDNA intelligence test generates useful DNA profiles, especially for samples such as blood, saliva, and semen that contain ample DNA, indicating the benefits of including ParaDNA as a prior step in forensic STR profiling pipelines.
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Affiliation(s)
- Min Li
- Institute of Forensic Medicine, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, China.,Shanghai Key Laboratory of Forensic Medicine, Shanghai Forensic Service Platform, Academy of Forensic Sciences, Ministry of Justice, P.R. China, Shanghai, China
| | - Ruiyang Tao
- Institute of Forensic Medicine, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, China.,Shanghai Key Laboratory of Forensic Medicine, Shanghai Forensic Service Platform, Academy of Forensic Sciences, Ministry of Justice, P.R. China, Shanghai, China
| | - Wei Zhou
- The Jackson Laboratory for Genomic Medicine, Farmington, CT, USA
| | - Yanan Li
- Shanghai Key Laboratory of Forensic Medicine, Shanghai Forensic Service Platform, Academy of Forensic Sciences, Ministry of Justice, P.R. China, Shanghai, China.,Department of Forensic Medical, School of Basic Medical Sciences, Inner Mongolia Medical University, Hohhot, China
| | - Meng Meng
- Shanghai Key Laboratory of Forensic Medicine, Shanghai Forensic Service Platform, Academy of Forensic Sciences, Ministry of Justice, P.R. China, Shanghai, China.,Department of Histology and Embryology, Harbin Medical University, Harbin, China
| | - Yilun Zhang
- Shanghai Key Laboratory of Forensic Medicine, Shanghai Forensic Service Platform, Academy of Forensic Sciences, Ministry of Justice, P.R. China, Shanghai, China.,School of Basic Medicine, Baotou Medical College, Baotou, China
| | - Linsheng Yu
- Department of Forensic Medicine, School of Basic Medical Science, Wenzhou Medical University, Wenzhou, China
| | - Liqin Chen
- School of Basic Medicine, Inner Mongolia Medical University, Hohhot, China
| | - Yingnan Bian
- Shanghai Key Laboratory of Forensic Medicine, Shanghai Forensic Service Platform, Academy of Forensic Sciences, Ministry of Justice, P.R. China, Shanghai, China.,Zhejiang Provincial Key Laboratory of Medical Genetics, Key Laboratory of Laboratory Medicine, Ministry of Education, China, School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Chengtao Li
- Institute of Forensic Medicine, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, China.,Shanghai Key Laboratory of Forensic Medicine, Shanghai Forensic Service Platform, Academy of Forensic Sciences, Ministry of Justice, P.R. China, Shanghai, China
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9
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The Role of Molecular Techniques for the Detection of Mycobacterium Tuberculosis Complex in Paraffin-embedded Biopsies. Appl Immunohistochem Mol Morphol 2019; 27:77-80. [DOI: 10.1097/pai.0000000000000533] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Liu Z, Zhang C, Shen H, Sun J, Zhang J. Duplex fluorescence melting curve analysis as a new tool for rapid detection and differentiation of genotype I, II and Bartha-K61 vaccine strains of pseudorabies virus. BMC Vet Res 2018; 14:372. [PMID: 30486818 PMCID: PMC6264625 DOI: 10.1186/s12917-018-1697-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 11/13/2018] [Indexed: 12/21/2022] Open
Abstract
Background Recently, pseudorabies (PR) outbreaks have been reported in a large number of swine herds vaccinated with the Bartha-K61 vaccine in China, the current pseudorabies virus (PRV) belonging to Genotype II is differential genetically from Bartha-K61 vaccine belonging to Genotype I. Furthermore, it has been proved that the Bartha-K61 vaccine cannot provide sufficient protection against the current PRVs in China. Therefore, the accurate and rapid identification of PRVs is essential. The objective of this study is to develop a duplex fluorescence melting curve analysis (FMCA) capable of rapid, simple, high-throughput differentiation of Chinese, European/American and Bartha-K61 vaccine strains of PRV. Results Primers 6F/6R and probes P1/P2, combined with three recombinant plasmids p-B (Bartha-K61), p-N (Genotype I), and p-H (Genotype II), were used to establish the Bicolor FMCA. FAM Tm values (probe P1) and HEX (probe P2) channels of p-B were used as reference values. Tm differences (ΔTm) between detected samples and reference plasmid p-B were calculated in each channel. Bartha-K61 vaccine samples had ΔTm values of ±1 °C in both FAM and HEX channels, Genotype I samples had ΔTm values of ±1 °C in the FAM channel and 4.38 ± 1 °C in the HEX channel, and Genotype II samples had ΔTm values of 6.52 ± 1 °C in the FAM channel and 4.38 ± 1 °C in the HEX channel. The minimum detection limit of the duplex FMCA was approximately 1 × 100 copies per reaction for p-B, p-N, and p-H. The duplex FMCA technique was used to detect and different 198 suspected clinical samples, of which 18 (9%) were positive for Genotype II strains and eight (4%) were positive for Bartha-K61 vaccine strains, and the results were compared with sequencing and phylogenetic analyses, which confirmed that the Bicolor FMCA worked correctly for all samples. Conclusions In this study, we developed a duplex FMCA of dual-labeled, self-quenched probes that was performed for rapid detection and differentiation of Genotype I, II and Bartha-K61 vaccine strains of PRV. The duplex FMCA was rapid, simple, and high-throughput, and will likely prove useful for molecular epidemiological investigations and pathogen surveillance of PRV. Electronic supplementary material The online version of this article (10.1186/s12917-018-1697-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Zhicheng Liu
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province,Ministry of Agriculture, P.R.China, Guangzhou, 510640, Guangdong, China
| | - Chunhong Zhang
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province,Ministry of Agriculture, P.R.China, Guangzhou, 510640, Guangdong, China
| | - Haiyan Shen
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province,Ministry of Agriculture, P.R.China, Guangzhou, 510640, Guangdong, China
| | - Junying Sun
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province,Ministry of Agriculture, P.R.China, Guangzhou, 510640, Guangdong, China
| | - Jianfeng Zhang
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province,Ministry of Agriculture, P.R.China, Guangzhou, 510640, Guangdong, China.
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11
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"The acid test"-validation of the ParaDNA® Body Fluid ID Test for routine forensic casework. Int J Legal Med 2018; 133:751-757. [PMID: 30460509 DOI: 10.1007/s00414-018-1971-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 11/12/2018] [Indexed: 01/18/2023]
Abstract
The identification of the cellular origin and composition of crime scene-related traces can provide crucial insight into a crime scene reconstruction. In the last decade, especially mRNA-based body fluid and tissue identification (BFI) has been vigorously examined. Besides capillary electrophoretic (CE) and real-time quantitative PCR (RT-qPCR)-based approaches for mRNA detection, melt curve analysis bears potential as a simple-to-use method for BFI. The ParaDNA® Body Fluid ID Test relies on HyBeacon® probes and was developed as a rapid test for mRNA-based BFI of six different body fluids: vaginal fluid, seminal fluid, sperm cells, saliva, menstrual, and peripheral blood. The herein presented work was performed as an "acid test" of the system and should clarify whether the approach matches the requirements of forensic routine casework in German police departments. Tested samples consisted of single source as well as of mixed samples.
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12
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Blackman S, Stafford-Allen B, Hanson EK, Panasiuk M, Brooker AL, Rendell P, Ballantyne J, Wells S. Developmental validation of the ParaDNA® Body Fluid ID System—A rapid multiplex mRNA-profiling system for the forensic identification of body fluids. Forensic Sci Int Genet 2018; 37:151-161. [DOI: 10.1016/j.fsigen.2018.08.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 06/01/2018] [Accepted: 08/22/2018] [Indexed: 11/28/2022]
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13
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Xiao R, Zhou H, Chen CM, Cheng H, Li H, Xie J, Zhao H, Han Q, Diao X. Transcriptional responses of Acropora hyacinthus embryo under the benzo(a)pyrene stress by deep sequencing. CHEMOSPHERE 2018; 206:387-397. [PMID: 29754063 DOI: 10.1016/j.chemosphere.2018.04.149] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 04/20/2018] [Accepted: 04/23/2018] [Indexed: 06/08/2023]
Abstract
Coral embryos are a critical and sensitive period for the early growth and development of coral. Benzo(a)pyrene (BaP) is widely distributed in the ocean and has strong toxicity, but there is little information on the toxic effects to coral embryos exposed to this widespread environmental contaminant. Thus, in this study, we utilized the Illumina Hiseq™ 4000 platform to explore the gene response of Acropora hyacinthus embryos under the BaP stress. A total of 130,042 Unigenes were obtained and analyzed, and approximately 37.67% of those matched with sequences from four different species. In total, 2606 Unigenes were up-regulated, and 3872 Unigenes were down-regulated. After Gene Ontology (GO) annotation, the results show that the "cellular process" and "metabolic process" were leading in the category of biological processes, which the "binding" and "catalytic activity" were the most abundant subcategories in molecular function. Based on the Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis, the most differentially expressed genes (DEGs) were enriched, as well as down-regulated in the pathways of oxidative phosphorylation, metabolism of xenobiotics, immune-related genes, apoptosis and human disease genes. At the same time, 388,197 of Single-nucleotide Polymorphisms (SNPs) and 6164 of Simple Sequence Repeats (SSRs) were obtained, which can be served as the richer and more valuable SSRs molecular markers in the future. The results of this study can help to better understand the toxicological mechanism of coral embryo exposed to BaP, and it is also essential for the protection and restoration of coral reef ecosystem in the future.
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Affiliation(s)
- Rong Xiao
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
| | - Hailong Zhou
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China.
| | - Chien-Min Chen
- Department of Environmental Resources Management, Chia Nan University of Pharmacy & Science, Tainan, Taiwan, China
| | - Huamin Cheng
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
| | - Hongwu Li
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; College of Ocean, Hainan University, Haikou 570228, China
| | - Jia Xie
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; College of Ocean, Hainan University, Haikou 570228, China
| | - Hongwei Zhao
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
| | - Qian Han
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
| | - Xiaoping Diao
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China; Ministry of Education Key Laboratory of Tropical Island Ecology, Hainan Normal University, Haikou, 571158, China.
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14
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Eddabra R, Ait Benhassou H. Rapid molecular assays for detection of tuberculosis. Pneumonia (Nathan) 2018; 10:4. [PMID: 29876241 PMCID: PMC5968606 DOI: 10.1186/s41479-018-0049-2] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 05/14/2018] [Indexed: 01/01/2023] Open
Abstract
Tuberculosis (TB) is an infectious disease that remains an important public health problem at the global level. It is one of the main causes of morbidity and mortality, due to the emergence of antibiotic resistant Mycobacterium strains and HIV co-infection. Over the past decade, important progress has been made for better control of the disease. While microscopy and culture continue to be indispensible for laboratory diagnosis of tuberculosis, the range of several molecular diagnostic tests, including the nucleic acid amplification test (NAAT) and whole-genome sequencing (WGS), have expanded tremendously. They are becoming more accessible not only for detection and identification of Mycobacterium tuberculosis complex in clinical specimens, but now extend to diagnosing multi-drug resistant strains. Molecular diagnostic tests provide timely results useful for high-quality patient care, low contamination risk, and ease of performance and speed. This review focuses on the current diagnostic tests in use, including emerging technologies used for detection of tuberculosis in clinical specimens. The sensitivity and specificity of these tests have also been taken into consideration.
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Affiliation(s)
- Rkia Eddabra
- Higher Institute of Nursing Professions and Health Techniques, Avenue Colonnel Major Habbouha Oueld Laâbid. Madinat Al Wahda I, Laayoune, Morocco
| | - Hassan Ait Benhassou
- Medical Biotechnology Center, Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Rabat Design Center, Avenue Mohamed El Jazouli - Madinat Al Irfane, 10100 Rabat, Morocco
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15
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Hwang GT. Single-Labeled Oligonucleotides Showing Fluorescence Changes Upon Hybridization with Target Nucleic Acids. Molecules 2018; 23:E124. [PMID: 29316733 PMCID: PMC6017082 DOI: 10.3390/molecules23010124] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 01/05/2018] [Accepted: 01/08/2018] [Indexed: 12/12/2022] Open
Abstract
Sequence-specific detection of nucleic acids has been intensively studied in the field of molecular diagnostics. In particular, the detection and analysis of single-nucleotide polymorphisms (SNPs) is crucial for the identification of disease-causing genes and diagnosis of diseases. Sequence-specific hybridization probes, such as molecular beacons bearing the fluorophore and quencher at both ends of the stem, have been developed to enable DNA mutation detection. Interestingly, DNA mutations can be detected using fluorescently labeled oligonucleotide probes with only one fluorophore. This review summarizes recent research on single-labeled oligonucleotide probes that exhibit fluorescence changes after encountering target nucleic acids, such as guanine-quenching probes, cyanine-containing probes, probes containing a fluorophore-labeled base, and microenvironment-sensitive probes.
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Affiliation(s)
- Gil Tae Hwang
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Korea.
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16
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Stafford-Allen B, Dawnay N, Hanson EK, Ball G, Gupta A, Blackman S, French DJ, Duxbury N, Ballantyne J, Wells S. Development of HyBeacon ® probes for specific mRNA detection using body fluids as a model system. Mol Cell Probes 2017; 38:51-59. [PMID: 29175285 DOI: 10.1016/j.mcp.2017.11.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 11/10/2017] [Accepted: 11/20/2017] [Indexed: 12/12/2022]
Abstract
HyBeacons are linear oligonucleotides which incorporate fluorescent dyes covalently linked to internal nucleotides. They have previously been used with PCR and isothermal amplification to interrogate SNPs and STRs in fields as diverse as clinical diagnostics, food authentication, and forensic DNA profiling. This work explores their use for the identification of expressed gene sequences through mRNA profiling. The use of mRNA is becoming increasingly common in forensic casework to identify body fluids on evidence items, as it offers higher specificity and fewer false positives than current chemical presumptive testing methods. The work presented here details the development of a single-step one-tube RT-PCR assay to detect the presence of body fluids of forensic interest (saliva, blood, seminal fluid, vaginal fluid and menstrual blood) using HyBeacon® probes and melt curve analysis. Each assay shows a high degree of specificity to the target body fluid mRNA suggesting there is no requirement to remove genomic DNA prior to analysis. Of the five assays developed, four were able to detect between 10 and 100 copies of target cDNA, the fifth 1000 copies of target. The results presented here demonstrate that such an approach can be optimised for non-expert users and further areas of work are discussed.
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Affiliation(s)
- Beccy Stafford-Allen
- Product Development Group, LGC Ltd, Culham Science Centre, Abingdon, OX14 3ED, UK.
| | - Nick Dawnay
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool, L3 3AF, UK
| | - Erin K Hanson
- National Center for Forensic Science, PO Box 162367, Orlando, FL, 32816-2367, USA
| | - Glyn Ball
- Product Development Group, LGC Ltd, Culham Science Centre, Abingdon, OX14 3ED, UK
| | - Ambika Gupta
- Department of Pharmacy and Forensic Science, King's College London, Faculty of Life Sciences and Medicine, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK
| | - Stephen Blackman
- Product Development Group, LGC Ltd, Culham Science Centre, Abingdon, OX14 3ED, UK
| | - David J French
- Product Development Group, LGC Ltd, Queens Road, Teddington, TW11 0LY, UK
| | - Nicola Duxbury
- Product Development Group, LGC Ltd, Culham Science Centre, Abingdon, OX14 3ED, UK
| | - Jack Ballantyne
- National Center for Forensic Science, PO Box 162367, Orlando, FL, 32816-2367, USA; Department of Chemistry, University of Central Florida, PO Box 162366, Orlando, FL, 32816-2366, USA
| | - Simon Wells
- Product Development Group, LGC Ltd, Culham Science Centre, Abingdon, OX14 3ED, UK
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17
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Pyrrolidinyl peptide nucleic acid terminally labeled with fluorophore and end-stacking quencher as a probe for highly specific DNA sequence discrimination. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.10.040] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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18
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Qiu J, Wilson A, El-Sagheer AH, Brown T. Combination probes with intercalating anchors and proximal fluorophores for DNA and RNA detection. Nucleic Acids Res 2016; 44:e138. [PMID: 27369379 PMCID: PMC5041472 DOI: 10.1093/nar/gkw579] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 06/16/2016] [Indexed: 12/20/2022] Open
Abstract
A new class of modified oligonucleotides (combination probes) has been designed and synthesised for use in genetic analysis and RNA detection. Their chemical structure combines an intercalating anchor with a reporter fluorophore on the same thymine nucleobase. The intercalator (thiazole orange or benzothiazole orange) provides an anchor, which upon hybridisation of the probe to its target becomes fluorescent and simultaneously stabilizes the duplex. The anchor is able to communicate via FRET to a proximal reporter dye (e.g. ROX, HEX, ATTO647N, FAM) whose fluorescence signal can be monitored on a range of analytical devices. Direct excitation of the reporter dye provides an alternative signalling mechanism. In both signalling modes, fluorescence in the unhybridised probe is switched off by collisional quenching between adjacent intercalator and reporter dyes. Single nucleotide polymorphisms in DNA and RNA targets are identified by differences in the duplex melting temperature, and the use of short hybridization probes, made possible by the stabilisation provided by the intercalator, enhances mismatch discrimination. Unlike other fluorogenic probe systems, placing the fluorophore and quencher on the same nucleobase facilitates the design of short probes containing multiple modifications. The ability to detect both DNA and RNA sequences suggests applications in cellular imaging and diagnostics.
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Affiliation(s)
- Jieqiong Qiu
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK
| | - Adam Wilson
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK
| | - Afaf H El-Sagheer
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK Chemistry Branch, Department of Science and Mathematics, Faculty of Petroleum and Mining Engineering, Suez University, Suez, 43721, Egypt
| | - Tom Brown
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK
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19
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Dawnay N, Hughes R, Court DS, Duxbury N. Species detection using HyBeacon(®) probe technology: Working towards rapid onsite testing in non-human forensic and food authentication applications. Forensic Sci Int Genet 2015; 20:103-111. [PMID: 26561743 DOI: 10.1016/j.fsigen.2015.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 10/05/2015] [Accepted: 10/15/2015] [Indexed: 10/22/2022]
Abstract
Identifying individual species or determining species' composition in an unknown sample is important for a variety of forensic applications. Food authentication, monitoring illegal trade in endangered species, forensic entomology, sexual assault case work and counter terrorism are just some of the fields that can require the detection of the biological species present. Traditional laboratory based approaches employ a wide variety of tools and technologies and exploit a number of different species specific traits including morphology, molecular differences and immuno-chemical analyses. A large number of these approaches require laboratory based apparatus and results can take a number of days to be returned to investigating authorities. Having a presumptive test for rapid identification could lead to savings in terms of cost and time and allow sample prioritisation if confirmatory testing in a laboratory is required later. This model study describes the development of an assay using a single HyBeacon(®) probe and melt curve analyses allowing rapid screening and authentication of food products labelled as Atlantic cod (Gadus morhua). Exploiting melt curve detection of species specific SNP sites on the COI gene the test allows detection of a target species (Atlantic cod) and closely related species which may be used as substitutes. The assay has been designed for use with the Field Portable ParaDNA system, a molecular detection platform for non-expert users. The entire process from sampling to result takes approximately 75min. Validation studies were performed on both single source genomic DNA, mixed genomic DNA and commercial samples. Data suggests the assay has a lower limit of detection of 31 pg DNA. The specificity of the assay to Atlantic cod was measured by testing highly processed food samples including frozen, defrosted and cooked fish fillets as well as fish fingers, battered fish fillet and fish pie. Ninety-six (92.7%) of all Atlantic cod food products, tested, provided a correct single species result with the remaining samples erroneously identified as containing non-target species. The data shows that the assay was quick to design and characterise and is also capable of yielding results that would be beneficial in a variety of fields, not least the authentication of food.
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Affiliation(s)
- Nick Dawnay
- Product Development Group, LGC Forensics, Culham Science Centre, Abingdon OX14 3ED, UK; School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UK.
| | - Rebecca Hughes
- Department of Pharmacy and Forensic Science, King's College London, Faculty of Life Sciences and Medicine, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
| | - Denise Syndercombe Court
- Department of Pharmacy and Forensic Science, King's College London, Faculty of Life Sciences and Medicine, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
| | - Nicola Duxbury
- Product Development Group, LGC Forensics, Culham Science Centre, Abingdon OX14 3ED, UK
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20
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Papadopoulou E, Meneghello M, Marafini P, Johnson RP, Brown T, Bartlett PN. The effect of temperature on electrochemically driven denaturation monitored by SERS. Bioelectrochemistry 2015; 106:353-8. [PMID: 26145815 DOI: 10.1016/j.bioelechem.2015.06.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 05/11/2015] [Accepted: 06/21/2015] [Indexed: 10/23/2022]
Abstract
Scanning the electrochemical potential negative results in the gradual denaturation of dsDNA immobilised at a nanostructure gold electrode, the DNA melting is monitored by SERS. We demonstrate the effect of the experimental temperature on the electrochemically driven melting (E-melting) by carrying out experiments between 10 and 28 °C using two DNA duplexes (20 and 21 base pairs). Significant temperature dependence for both the melting potentials, Em, and the steepness of the melting curves was found over the range 10 to 18 °C. Above 18 °C the results were found to be independent of temperature. The relative temperature insensitivity of the melting potentials above 18 °C is advantageous for the application of the electrochemically driven melting technique because precise temperature control is not necessary for measurements that are carried out around room temperature. Conversely temperature dependence below 18 °C offers a way to improve discrimination for highly similar DNA sequences.
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Affiliation(s)
| | - Marta Meneghello
- Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK
| | - Pietro Marafini
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford OX1 3TA, UK
| | - Robert P Johnson
- Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK
| | - Tom Brown
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford OX1 3TA, UK
| | - Philip N Bartlett
- Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK.
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21
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Blackman S, Dawnay N, Ball G, Stafford-Allen B, Tribble N, Rendell P, Neary K, Hanson EK, Ballantyne J, Kallifatidis B, Mendel J, Mills DK, Wells S. Developmental validation of the ParaDNA ® Intelligence System—A novel approach to DNA profiling. Forensic Sci Int Genet 2015; 17:137-148. [DOI: 10.1016/j.fsigen.2015.04.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 04/01/2015] [Accepted: 04/24/2015] [Indexed: 11/25/2022]
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22
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Lahdenperä S, Spangar A, Lempainen AM, Joki L, Soukka T. An integrated closed-tube 2-plex PCR amplification and hybridization assay with switchable lanthanide luminescence based spatial detection. Analyst 2015; 140:3960-8. [PMID: 25882638 DOI: 10.1039/c5an00253b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Switchable lanthanide luminescence is a binary probe technology that inherently enables a high signal modulation in separation-free detection of DNA targets. A luminescent lanthanide complex is formed only when the two probes hybridize adjacently to their target DNA. We have now further adapted this technology for the first time in the integration of a 2-plex polymerase chain reaction (PCR) amplification and hybridization-based solid-phase detection of the amplification products of the Staphylococcus aureus gyrB gene and an internal amplification control (IAC). The assay was performed in a sealed polypropylene PCR chip containing a flat-bottom reaction chamber with two immobilized capture probe spots. The surface of the reaction chamber was functionalized with NHS-PEG-azide and alkyne-modified capture probes for each amplicon, labeled with a light harvesting antenna ligand, and covalently attached as spots to the azide-modified reaction chamber using a copper(i)-catalyzed azide-alkyne cycloaddition. Asymmetric duplex-PCR was then performed with no template, one template or both templates present and with a europium ion carrier chelate labeled probe for each amplicon in the reaction. After amplification europium fluorescence was measured by scanning the reaction chamber as a 10 × 10 raster with 0.6 mm resolution in time-resolved mode. With this assay we were able to co-amplify and detect the amplification products of the gyrB target from 100, 1000 and 10,000 copies of isolated S. aureus DNA together with the amplification products from the initial 5000 copies of the synthetic IAC template in the same sealed reaction chamber. The addition of 10,000 copies of isolated non-target Escherichia coli DNA in the same reaction with 5000 copies of the synthetic IAC template did not interfere with the amplification or detection of the IAC. The dynamic range of the assay for the synthetic S. aureus gyrB target was three orders of magnitude and the limit of detection of 8 pM was obtained. This proof-of-concept study shows that the switchable lanthanide luminescent probes enable separation-free array-based multiplexed detection of the amplification products in a closed-tube PCR which can enable a higher degree of multiplexing than is currently feasible by using different spectrally separated fluorescent probes.
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Affiliation(s)
- Susanne Lahdenperä
- Department of Biotechnology, University of Turku, Tykistökatu 6 A 6th floor, FI-20520 Turku, Finland.
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23
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French DJ, Richardson JA, Howard RL, Brown T, Debenham PG. Synthesis and use of universal sequence probes in fluorogenic multi-strand hybridisation complexes for economical nucleic acid testing. Mol Cell Probes 2015; 29:228-36. [PMID: 25981184 DOI: 10.1016/j.mcp.2015.05.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 05/06/2015] [Accepted: 05/12/2015] [Indexed: 10/23/2022]
Abstract
Analysis of nucleic acid amplification products has become the gold standard for applications such as pathogen detection and characterisation of single nucleotide polymorphisms and short tandem repeat sequences. The development of real-time PCR and melting curve analysis using fluorescent probes has simplified nucleic acid analyses. However, the cost of probe synthesis can be prohibitive when developing large panels of tests. We describe an economic two-stage method for probe synthesis, and a new method for nucleic acid sequence analysis which together considerably reduce costs. The analysis method utilises three-strand and four-strand hybridisation complexes for the detection and identification of nucleic acid target sequences by real-time PCR and fluorescence melting.
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Affiliation(s)
| | - James A Richardson
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK
| | | | - Tom Brown
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Rd, Oxford OX1 3TA, UK
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24
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Tribble ND, Miller JA, Dawnay N, Duxbury NJ. Applicability of the ParaDNA®Screening System to Seminal Samples. J Forensic Sci 2015; 60:690-2. [DOI: 10.1111/1556-4029.12742] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 02/24/2014] [Accepted: 06/04/2014] [Indexed: 11/30/2022]
Affiliation(s)
| | - Jamie A.D. Miller
- School of Biomedical Sciences; King's College London; Franklin-Wilkins Building Stamford Street London SE1 8WA U.K
| | - Nick Dawnay
- LGC Forensics; Culham Science Centre; Abingdon Oxfordshire OX14 3ED U.K
| | - Nicola J. Duxbury
- LGC Forensics; Culham Science Centre; Abingdon Oxfordshire OX14 3ED U.K
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25
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Papadopoulou E, Gale N, Goodchild SA, Cleary DW, Weller SA, Brown T, Bartlett PN. Strain discrimination of Yersinia pestis using a SERS-based electrochemically driven melting curve analysis of variable number tandem repeat sequences. Chem Sci 2015; 6:1846-1852. [PMID: 29449917 PMCID: PMC5701729 DOI: 10.1039/c4sc03084b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Accepted: 12/23/2014] [Indexed: 12/05/2022] Open
Abstract
Strain discrimination within genetically highly similar bacteria is critical for epidemiological studies and forensic applications. An electrochemically driven melting curve analysis monitored by SERS has been utilised to reliably discriminate strains of the bacterial pathogen Yersinia pestis, the causative agent of plague. DNA amplicons containing Variable Number Tandem Repeats (VNTRs) were generated from three strains of Y. pestis: CO92, Harbin 35 and Kim. These amplicons contained a 10 base pair VNTR repeated 6, 5, and 4 times in CO92, Harbin 35 and Kim respectively. The assay also included a blocker oligonucleotide comprising 3 repeats of the 10-mer VNTR sequence. The use of the blocker reduced the effective length of the target sequence available to bind to the surface bound probe and significantly improved the sensitivity of the discrimination. The results were consistent during three replicates that were carried out on different days, using different batches of PCR product and different SERS sphere segment void (SSV) substrate. This methodology which combines low cost, speed and sensitivity is a promising alternative to the time consuming current electrophoretic methods.
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Affiliation(s)
- E Papadopoulou
- Chemistry , University of Southampton , Highfield , Southampton SO17 1BJ , UK .
| | - N Gale
- ATDBio Ltd , Chemistry , University of Southampton , Highfield , Southampton SO17 1BJ , UK
| | - S A Goodchild
- DSTL , Wiltshire SP4 0JQ , Salisbury , Porton Down , UK
| | - D W Cleary
- DSTL , Wiltshire SP4 0JQ , Salisbury , Porton Down , UK
| | - S A Weller
- DSTL , Wiltshire SP4 0JQ , Salisbury , Porton Down , UK
| | - T Brown
- Department of Chemistry , University of Oxford , Chemistry Research Laboratory , Oxford OX1 3TA , UK
| | - P N Bartlett
- Chemistry , University of Southampton , Highfield , Southampton SO17 1BJ , UK .
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26
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Papadopoulou E, Goodchild SA, Cleary DW, Weller SA, Gale N, Stubberfield MR, Brown T, Bartlett PN. Using surface-enhanced Raman spectroscopy and electrochemically driven melting to discriminate Yersinia pestis from Y. pseudotuberculosis based on single nucleotide polymorphisms within unpurified polymerase chain reaction amplicons. Anal Chem 2015; 87:1605-12. [PMID: 25551670 DOI: 10.1021/ac503063c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The development of sensors for the detection of pathogen-specific DNA, including relevant species/strain level discrimination, is critical in molecular diagnostics with major impacts in areas such as bioterrorism and food safety. Herein, we use electrochemically driven denaturation assays monitored by surface-enhanced Raman spectroscopy (SERS) to target single nucleotide polymorphisms (SNPs) that distinguish DNA amplicons generated from Yersinia pestis, the causative agent of plague, from the closely related species Y. pseudotuberculosis. Two assays targeting SNPs within the groEL and metH genes of these two species have been successfully designed. Polymerase chain reaction (PCR) was used to produce Texas Red labeled single-stranded DNA (ssDNA) amplicons of 262 and 251 bases for the groEL and metH targets, respectively. These amplicons were used in an unpurified form to hybridize to immobilized probes then subjected to electrochemically driven melting. In all cases electrochemically driven melting was able to discriminate between fully homologous DNA and that containing SNPs. The metH assay was particularly challenging due to the presence of only a single base mismatch in the middle of the 251 base long PCR amplicon. However, manipulation of assay conditions (conducting the electrochemical experiments at 10 °C) resulted in greater discrimination between the complementary and mismatched DNA. Replicate data were collected and analyzed for each duplex on different days, using different batches of PCR product and different sphere segment void (SSV) substrates. Despite the variability introduced by these differences, the assays are shown to be reliable and robust providing a new platform for strain discrimination using unpurified PCR samples.
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Affiliation(s)
- Evanthia Papadopoulou
- Chemistry, University of Southampton , Highfield, Southampton SO17 1BJ, United Kingdom
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27
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Howard RL, French DJ, Richardson JA, O'Neill CE, Andreou MP, Brown T, Clark D, Clarke IN, Holloway JW, Marsh P, Debenham PG. Rapid detection of diagnostic targets using isothermal amplification and HyBeacon probes--a homogenous system for sequence-specific detection. Mol Cell Probes 2014; 29:92-8. [PMID: 25542839 DOI: 10.1016/j.mcp.2014.12.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 12/16/2014] [Accepted: 12/17/2014] [Indexed: 01/17/2023]
Abstract
Isothermal amplification is a rapid, simple alternative to PCR, with amplification commonly detected using fluorescently labelled oligonucleotide probes, intercalating dyes or increased turbidity as a result of magnesium pyrophosphate generation. SNP identification is possible but requires either allele-specific primers or multiple dye-labelled probes, but further downstream processing is often required for allelic identification. Here we demonstrate that modification of common isothermal amplification methods by the addition of HyBeacon probes permits homogeneous sequence detection and discrimination by melting or annealing curve analysis. Furthermore, we demonstrate that isothermal amplification and sequence discrimination is possible directly from a crude sample such as an expressed buccal swab.
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Affiliation(s)
| | | | - James A Richardson
- University of Southampton School of Chemistry, Highfield, Southampton SO17 1BJ, UK
| | - Colette E O'Neill
- University of Southampton Faculty of Medicine, Clinical and Experimental Sciences, Southampton General Hospital, Southampton SO16 6YD, UK
| | | | - Tom Brown
- University of Southampton School of Chemistry, Highfield, Southampton SO17 1BJ, UK
| | - Duncan Clark
- OptiGene Ltd., Unit 5, Blatchford Road, Horsham, RH13 5QR, UK
| | - Ian N Clarke
- University of Southampton Faculty of Medicine, Clinical and Experimental Sciences, Southampton General Hospital, Southampton SO16 6YD, UK
| | - John W Holloway
- University of Southampton Faculty of Medicine, Clinical and Experimental Sciences, Southampton General Hospital, Southampton SO16 6YD, UK
| | - Peter Marsh
- Health Protection Agency, Southampton General Hospital, Southampton SO16 6YD, UK
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28
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Navarro E, Serrano-Heras G, Castaño MJ, Solera J. Real-time PCR detection chemistry. Clin Chim Acta 2014; 439:231-50. [PMID: 25451956 DOI: 10.1016/j.cca.2014.10.017] [Citation(s) in RCA: 234] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 10/09/2014] [Accepted: 10/11/2014] [Indexed: 12/28/2022]
Abstract
Real-time PCR is the method of choice in many laboratories for diagnostic and food applications. This technology merges the polymerase chain reaction chemistry with the use of fluorescent reporter molecules in order to monitor the production of amplification products during each cycle of the PCR reaction. Thus, the combination of excellent sensitivity and specificity, reproducible data, low contamination risk and reduced hand-on time, which make it a post-PCR analysis unnecessary, has made real-time PCR technology an appealing alternative to conventional PCR. The present paper attempts to provide a rigorous overview of fluorescent-based methods for nucleic acid analysis in real-time PCR described in the literature so far. Herein, different real-time PCR chemistries have been classified into two main groups; the first group comprises double-stranded DNA intercalating molecules, such as SYBR Green I and EvaGreen, whereas the second includes fluorophore-labeled oligonucleotides. The latter, in turn, has been divided into three subgroups according to the type of fluorescent molecules used in the PCR reaction: (i) primer-probes (Scorpions, Amplifluor, LUX, Cyclicons, Angler); (ii) probes; hydrolysis (TaqMan, MGB-TaqMan, Snake assay) and hybridization (Hybprobe or FRET, Molecular Beacons, HyBeacon, MGB-Pleiades, MGB-Eclipse, ResonSense, Yin-Yang or displacing); and (iii) analogues of nucleic acids (PNA, LNA, ZNA, non-natural bases: Plexor primer, Tiny-Molecular Beacon). In addition, structures, mechanisms of action, advantages and applications of such real-time PCR probes and analogues are depicted in this review.
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Affiliation(s)
- E Navarro
- Research Unit, General University Hospital, Laurel s/n, 02006 Albacete, Spain.
| | - G Serrano-Heras
- Research Unit, General University Hospital, Laurel s/n, 02006 Albacete, Spain.
| | - M J Castaño
- Research Unit, General University Hospital, Laurel s/n, 02006 Albacete, Spain.
| | - J Solera
- Internal Medicine Department, General University Hospital, Hermanos Falcó 37, 02006 Albacete, Spain.
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Storts DR. Alternative probe-based detection systems in quantitative PCR. J Mol Diagn 2014; 16:612-4. [PMID: 25242060 DOI: 10.1016/j.jmoldx.2014.08.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Revised: 08/21/2014] [Accepted: 08/27/2014] [Indexed: 11/30/2022] Open
Affiliation(s)
- Douglas R Storts
- Research & Development, Promega Corporation, Madison, Wisconsin.
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30
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Eigner U, Veldenzer A, Holfelder M. Validation of the FluoroType® MRSA assay for the rapid identification of methicillin-resistant Staphylococcus aureus directly from patient material. J Microbiol Methods 2014; 107:71-3. [PMID: 25193437 DOI: 10.1016/j.mimet.2014.08.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 08/15/2014] [Accepted: 08/16/2014] [Indexed: 11/18/2022]
Abstract
We performed the first evaluation study of the new HyBeacon based FluoroType(®) MRSA assay for the detection of MRSA directly from 617 patient specimens. Using culture as the reference method sensitivity and specificity were higher than 95%. Results were available within 2.5h, including DNA extraction.
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31
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Dawnay N, Stafford-Allen B, Moore D, Blackman S, Rendell P, Hanson EK, Ballantyne J, Kallifatidis B, Mendel J, Mills DK, Nagy R, Wells S. Developmental Validation of the ParaDNA® Screening System - A presumptive test for the detection of DNA on forensic evidence items. Forensic Sci Int Genet 2014; 11:73-9. [PMID: 24670380 DOI: 10.1016/j.fsigen.2014.02.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 01/07/2014] [Accepted: 02/07/2014] [Indexed: 10/25/2022]
Abstract
Current assessment of whether a forensic evidence item should be submitted for STR profiling is largely based on the personal experience of the Crime Scene Investigator (CSI) and the submissions policy of the law enforcement authority involved. While there are chemical tests that can infer the presence of DNA through the detection of biological stains, the process remains mostly subjective and leads to many samples being submitted that give no profile or not being submitted although DNA is present. The ParaDNA(®) Screening System was developed to address this issue. It consists of a sampling device, pre-loaded reaction plates and detection instrument. The test uses direct PCR with fluorescent HyBeacon™ detection of PCR amplicons to identify the presence and relative amount of DNA on an evidence item and also provides a gender identification result in approximately 75 minutes. This simple-to-use design allows objective data to be acquired by both DNA analyst and non-specialist personnel, to enable a more informed submission decision to be made. The developmental validation study described here tested the sensitivity, reproducibility, accuracy, inhibitor tolerance, and performance of the ParaDNA Screening System on a range of mock evidence items. The data collected demonstrates that the ParaDNA Screening System identifies the presence of DNA on a variety of evidence items including blood, saliva and touch DNA items.
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Affiliation(s)
- Nick Dawnay
- Product Development Group, LGC Forensics, Culham Science Centre, Abingdon, OX14 3ED.
| | - Beccy Stafford-Allen
- Product Development Group, LGC Forensics, Culham Science Centre, Abingdon, OX14 3ED
| | - Dave Moore
- Innovation & Development Team, LGC, Teddington, TW11 0LY
| | - Stephen Blackman
- Product Development Group, LGC Forensics, Culham Science Centre, Abingdon, OX14 3ED
| | - Paul Rendell
- Product Development Group, LGC Forensics, Culham Science Centre, Abingdon, OX14 3ED
| | - Erin K Hanson
- National Center for Forensic Science, PO Box 162367, Orlando, FL 32816-2367, USA
| | - Jack Ballantyne
- National Center for Forensic Science, PO Box 162367, Orlando, FL 32816-2367, USA; Department of Chemistry, University of Central Florida, PO Box 162366, Orlando, FL 32816-2366, USA
| | - Beatrice Kallifatidis
- International Forensic Research Institute, Florida International University, Miami, FL, USA
| | - Julian Mendel
- International Forensic Research Institute, Florida International University, Miami, FL, USA
| | - DeEtta K Mills
- International Forensic Research Institute, Florida International University, Miami, FL, USA; Department of Biological Sciences, Florida International University, Miami, FL, USA
| | - Randy Nagy
- Product Development Group, LGC Forensics, Culham Science Centre, Abingdon, OX14 3ED
| | - Simon Wells
- Product Development Group, LGC Forensics, Culham Science Centre, Abingdon, OX14 3ED
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32
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Richardson JA, Morgan T, Andreou M, Brown T. Use of a large Stokes-shift fluorophore to increase the multiplexing capacity of a point-of-care DNA diagnostic device. Analyst 2013; 138:3626-8. [PMID: 23675581 DOI: 10.1039/c3an00593c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The intense demand for fluorescence-based point of care (POC) DNA diagnostics is driving developments to reduce the size of instrumentation, imposing limitations on the optical hardware that can be included. Here we describe a combination of instrumentation and fluorogenic probes to detect three fluorophores using two excitation and two detection channels.
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Affiliation(s)
- James A Richardson
- Chemistry, University of Southampton, Southampton, Hampshire SO17 1BJ, UK
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33
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Kashida H, Asanuma* H. Oligonucleotide Conjugates for Detection of Specific Nucleic Acid Sequences. DNA CONJUGATES AND SENSORS 2012. [DOI: 10.1039/9781849734936-00242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
In this chapter, we summarise the designs of fluorophore-modified nucleic acids used as probes for the detection of target DNA/RNA. Recently, there has been an increasing demand for the sequence-specific detection of DNA and RNA in biology and biotechnology. Fluorescent probes based on nucleic acids are useful because of their simplicity and ease of handling. Here, we described three types of fluorescent probe: 1) linear probes, 2) binary probes, and 3) molecular beacons. Each can have one or more fluorophores. Mechanisms for the fluorescence responses of these probes are also discussed in detail. These fluorescent probes have been used in real-time polymerase chain reaction (PCR), genetic analyses, and messenger RNA (mRNA) imaging in living cells. Improvements in sensitivity, selectivity, and nuclease resistance of these probes will lead to more widespread applications in chemical biology, biotechnology, and medicine.
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Affiliation(s)
- Hiromu Kashida
- Graduate School of Engineering Nagoya University Furo-cho, Chikusa-ku, Nagoya 464-8603 Japan
| | - Hiroyuki Asanuma*
- Graduate School of Engineering Nagoya University Furo-cho, Chikusa-ku, Nagoya 464-8603 Japan
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Hövelmann F, Bethge L, Seitz O. Single labeled DNA FIT probes for avoiding false-positive signaling in the detection of DNA/RNA in qPCR or cell media. Chembiochem 2012; 13:2072-81. [PMID: 22936610 DOI: 10.1002/cbic.201200397] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Indexed: 12/13/2022]
Abstract
Oligonucleotide hybridization probes that fluoresce upon binding to complementary nucleic acid targets allow the real-time detection of DNA or RNA in homogeneous solution. The most commonly used probes rely on the distance-dependent interaction between a fluorophore and another label. Such dual-labeled oligonucleotides signal the change of the global conformation that accompanies duplex formation. However, undesired nonspecific binding events and/or probe degradation also lead to changes in the label-label distance and, thus, to ambiguities in fluorescence signaling. Herein, we introduce singly labeled DNA probes, "DNA FIT probes", that are designed to avoid false-positive signals. A thiazole orange (TO) intercalator dye serves as an artificial base in the DNA probe. The probes show little background because the attachment mode hinders 1) interactions of the "TO base" in cis with the disordered nucleobases of the single strand, and 2) intercalation of the "TO nucleotide" with double strands in trans. However, formation of the probe-target duplex enforces stacking and increases the fluorescence of the TO base. We explored open-chain and carbocyclic nucleotides. We show that the incorporation of the TO nucleotides has no effect on the thermal stability of the probe-target complexes. DNA and RNA targets provided up to 12-fold enhancements of the TO emission upon hybridization of DNA FIT probes. Experiments in cell media demonstrated that false-positive signaling was prevented when DNA FIT probes were used. Of note, DNA FIT probes tolerate a wide range of hybridization temperature; this enabled their application in quantitative polymerase chain reactions.
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Affiliation(s)
- Felix Hövelmann
- Institut für Chemie der Humboldt-Universität zu Berlin, Brook-Taylor Strasse 2, 12489 Berlin, Germany
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35
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Hall LM, Gerowska M, Brown T. A highly fluorescent DNA toolkit: synthesis and properties of oligonucleotides containing new Cy3, Cy5 and Cy3B monomers. Nucleic Acids Res 2012; 40:e108. [PMID: 22495935 PMCID: PMC3413114 DOI: 10.1093/nar/gks303] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Cy3B is an extremely bright and stable fluorescent dye, which is only available for coupling to nucleic acids post-synthetically. This severely limits its use in the fields of genomics, biology and nanotechnology. We have optimized the synthesis of Cy3B, and for the first time produced a diverse range of Cy3B monomers for use in solid-phase oligonucleotide synthesis. This molecular toolkit includes phosphoramidite monomers with Cy3B linked to deoxyribose, to the 5-position of thymine, and to a hexynyl linker, in addition to an oligonucleotide synthesis resin in which Cy3B is linked to deoxyribose. These monomers have been used to incorporate single and multiple Cy3B units into oligonucleotides internally and at both termini. Cy3B Taqman probes, Scorpions and HyBeacons have been synthesized and used successfully in mutation detection, and a dual Cy3B Molecular Beacon was synthesized and found to be superior to the corresponding Cy3B/DABCYL Beacon. Attachment of Cy3, Cy3B and Cy5 to the 5-position of thymidine by an ethynyl linker enabled the synthesis of an oligonucleotide FRET system. The rigid linker between the dye and nucleobase minimizes dye–dye and dye–DNA interactions and reduces fluorescence quenching. These reagents open up new future applications of Cy3B, including more sensitive single-molecule and cell-imaging studies.
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Affiliation(s)
- Lucy M Hall
- School of Chemistry, University of Southampton, SO17 1BJ, UK
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36
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Efficient reverse click labeling of azide oligonucleotides with multiple alkynyl Cy-Dyes applied to the synthesis of HyBeacon probes for genetic analysis. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.11.041] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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37
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Reenabthue N, Boonlua C, Vilaivan C, Vilaivan T, Suparpprom C. 3-Aminopyrrolidine-4-carboxylic acid as versatile handle for internal labeling of pyrrolidinyl PNA. Bioorg Med Chem Lett 2011; 21:6465-9. [PMID: 21937225 DOI: 10.1016/j.bmcl.2011.08.079] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 08/15/2011] [Accepted: 08/17/2011] [Indexed: 10/17/2022]
Abstract
Conformationally restricted pyrrolidinyl PNAs with an α/β-dipeptide backbone consisting of a nucleobase-modified proline and a cyclic five-membered amino acid spacer such as (1S,2S)-2-aminocyclopentanecarboxylic acid (ACPC) (acpcPNA) can form very stable hybrids with DNA with high Watson-Crick base pairing specificity. This work aims to explore the effect of incorporating 3-aminopyrrolidine-4-carboxylic acid (APC), which is isosteric to the ACPC spacer, into the acpcPNA. It is expected that the modification should not negatively affect the DNA binding properties, and that the additional nitrogen atom in the APC should provide a handle for internal modification. Orthogonally-protected (N(3)-Fmoc/N(1)-Boc and N(3)-Fmoc/N(1)-Tfa) APC monomers have been successfully synthesized and incorporated into the acpcPNA by Fmoc-solid-phase peptide synthesis. T(m), UV and CD spectroscopy confirmed that the (3R,4S)-APC could substitute the (1S,2S)-ACPC spacer in the acpcPNA with only slightly decreasing the stability of the hybrids formed between the modified acpc/apcPNA and DNA. In contrast, the (3S,4R) enantiomer of APC caused substantial destabilization of the hybrids. Furthermore, a successful on-solid-support internal labeling of the acpc/apcPNA via amide bond formation between pyrene-1-carboxylic acid or 4-(pyrene-1-yl) butyric acid and the pyrrolidine nitrogen atom of the APC spacer has been demonstrated. Fluorescence properties of the pyrene-labeled acpc/apcPNAs are sensitive to their hybridization states and can readily distinguish between complementary and single-mismatched DNA targets.
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Affiliation(s)
- Nisanath Reenabthue
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Naresuan University, Ta-Po District, Muang, Phitsanulok 65000, Thailand
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38
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Howard R, Leathart JBS, French DJ, Krishan E, Kohnke H, Wadelius M, van Schie R, Verhoef T, Maitland-van der Zee AH, Daly AK, Barallon R. Genotyping for CYP2C9 and VKORC1 alleles by a novel point of care assay with HyBeacon® probes. Clin Chim Acta 2011; 412:2063-9. [PMID: 21827742 DOI: 10.1016/j.cca.2011.07.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2011] [Accepted: 07/09/2011] [Indexed: 02/03/2023]
Abstract
BACKGROUND Coumarin anticoagulants such as warfarin are used to treat and prevent thromboembolic events in patients. The required dosage is difficult to predict and the risk of over or under anticoagulation are dependent on several environmental and clinical factors, such as concurrent medication, diet, age and genotype for polymorphisms in two genes CYP2C9 and VKORC1. METHODS A novel fluorescent PCR genotyping assay using HyBeacon® probes, was developed to enable clinical staff to genotype the CYP2C9*2 and CYP2C9*3 alleles and the VKORC1 G-1639A polymorphism directly from unextracted blood samples. A prototype PCR instrument, Genie 1, suitable for point of care use was developed to carry out the assays. The panel of tests was validated by analysing blood samples from 156 individuals and comparing genotypes with data obtained using DNA samples from the same individuals. The accuracy of genotypes obtained with the Genie 1 was compared against results from well validated real time PCR and PCR-restriction fragment length polymorphism analysis. RESULTS Identical results were obtained for the newly developed HyBeacon® method and the validation method in all cases except for one where no result was obtained for the VKORC1 polymorphism on the Genie instrument. The samples used for validation represented all six possible *2 and *3 allele-related CYP2C9 genotypes and all three VKORC1 G-1639A genotypes. CONCLUSIONS We observed excellent accuracy for the newly developed method which can determine genotype in less than 2 h.
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Gale N, Kocalka P, Mardle C, Brown T. PNA HyBeacons for analysis of human mutations related to statin-induced myopathy. ARTIFICIAL DNA, PNA & XNA 2011; 2:79-89. [PMID: 22567191 PMCID: PMC3324338 DOI: 10.4161/adna.18179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Aminoalkyl and alkyne-tagged PNA HyBeacons have been synthesized, labeled with fluorescein via conventional amide bond or triazole formation (click chemistry) and used to detect single nucleotide polymorphisms (SNPs) implicated in statin-induced myopathy. The PNA HyBeacons gave much better mismatch/mutant discrimination than conventional DNA HyBeacons but smaller fluorescence changes on melting.
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Affiliation(s)
- Nittaya Gale
- ATDBio Ltd., School of Chemistry, University of Southampton; Southampton, UK
| | - Petr Kocalka
- School of Chemistry, University of Southampton; Southampton, UK
| | | | - Tom Brown
- School of Chemistry, University of Southampton; Southampton, UK
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40
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Huang Q, Liu Z, Liao Y, Chen X, Zhang Y, Li Q. Multiplex fluorescence melting curve analysis for mutation detection with dual-labeled, self-quenched probes. PLoS One 2011; 6:e19206. [PMID: 21552536 PMCID: PMC3084284 DOI: 10.1371/journal.pone.0019206] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Accepted: 03/22/2011] [Indexed: 12/31/2022] Open
Abstract
Probe-based fluorescence melting curve analysis (FMCA) is a powerful tool for mutation detection based on melting temperature generated by thermal denaturation of the probe-target hybrid. Nevertheless, the color multiplexing, probe design, and cross-platform compatibility remain to be limited by using existing probe chemistries. We hereby explored two dual-labeled, self-quenched probes, TaqMan and shared-stem molecular beacons, in their ability to conduct FMCA. Both probes could be directly used for FMCA and readily integrated with closed-tube amplicon hybridization under asymmetric PCR conditions. Improved flexibility of FMCA by using these probes was illustrated in three representative applications of FMCA: mutation scanning, mutation identification and mutation genotyping, all of which achieved improved color-multiplexing with easy probe design and versatile probe combination and all were validated with a large number of real clinical samples. The universal cross-platform compatibility of these probes-based FMCA was also demonstrated by a 4-color mutation genotyping assay performed on five different real-time PCR instruments. The dual-labeled, self-quenched probes offered unprecedented combined advantage of enhanced multiplexing, improved flexibility in probe design, and expanded cross-platform compatibility, which would substantially improve FMCA in mutation detection of various applications.
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Affiliation(s)
- Qiuying Huang
- Engineering Research Center of Molecular Diagnostics, Ministry of Education, Department of Biomedical Sciences, School of Life Sciences, and the Key Laboratory of the Ministry of Education for Cell Biology and Tumor Cell Engineering, Xiamen University, Xiamen, Fujian, China
| | - Zanzan Liu
- Engineering Research Center of Molecular Diagnostics, Ministry of Education, Department of Biomedical Sciences, School of Life Sciences, and the Key Laboratory of the Ministry of Education for Cell Biology and Tumor Cell Engineering, Xiamen University, Xiamen, Fujian, China
| | - Yiqun Liao
- Institute for Biomedical Research, Xiamen University, Xiamen, Fujian, China
| | - Xiaoyun Chen
- Engineering Research Center of Molecular Diagnostics, Ministry of Education, Department of Biomedical Sciences, School of Life Sciences, and the Key Laboratory of the Ministry of Education for Cell Biology and Tumor Cell Engineering, Xiamen University, Xiamen, Fujian, China
| | - Yi Zhang
- Institute for Biomedical Research, Xiamen University, Xiamen, Fujian, China
| | - Qingge Li
- Engineering Research Center of Molecular Diagnostics, Ministry of Education, Department of Biomedical Sciences, School of Life Sciences, and the Key Laboratory of the Ministry of Education for Cell Biology and Tumor Cell Engineering, Xiamen University, Xiamen, Fujian, China
- * E-mail:
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Juskowiak B. Nucleic acid-based fluorescent probes and their analytical potential. Anal Bioanal Chem 2011; 399:3157-76. [PMID: 21046088 PMCID: PMC3044240 DOI: 10.1007/s00216-010-4304-5] [Citation(s) in RCA: 161] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2010] [Revised: 10/04/2010] [Accepted: 10/05/2010] [Indexed: 12/21/2022]
Abstract
It is well known that nucleic acids play an essential role in living organisms because they store and transmit genetic information and use that information to direct the synthesis of proteins. However, less is known about the ability of nucleic acids to bind specific ligands and the application of oligonucleotides as molecular probes or biosensors. Oligonucleotide probes are single-stranded nucleic acid fragments that can be tailored to have high specificity and affinity for different targets including nucleic acids, proteins, small molecules, and ions. One can divide oligonucleotide-based probes into two main categories: hybridization probes that are based on the formation of complementary base-pairs, and aptamer probes that exploit selective recognition of nonnucleic acid analytes and may be compared with immunosensors. Design and construction of hybridization and aptamer probes are similar. Typically, oligonucleotide (DNA, RNA) with predefined base sequence and length is modified by covalent attachment of reporter groups (one or more fluorophores in fluorescence-based probes). The fluorescent labels act as transducers that transform biorecognition (hybridization, ligand binding) into a fluorescence signal. Fluorescent labels have several advantages, for example high sensitivity and multiple transduction approaches (fluorescence quenching or enhancement, fluorescence anisotropy, fluorescence lifetime, fluorescence resonance energy transfer (FRET), and excimer-monomer light switching). These multiple signaling options combined with the design flexibility of the recognition element (DNA, RNA, PNA, LNA) and various labeling strategies contribute to development of numerous selective and sensitive bioassays. This review covers fundamentals of the design and engineering of oligonucleotide probes, describes typical construction approaches, and discusses examples of probes used both in hybridization studies and in aptamer-based assays.
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Affiliation(s)
- Bernard Juskowiak
- Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland.
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42
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Abstract
Asynchronous PCR (aPCR) is a new PCR method that directs an ordered and sequential amplification of the + and - strands of DNA amplicons. There are several unique characteristics of aPCR that generate new application opportunities. The melting temperature (Tm) of the forward and reverse aPCR primers differ by at least 15°C. The concentration of the lower Tm primer is reduced from 900 to 100 nM, thereby allowing for asynchronous or asymmetric strand-specific amplification. Furthermore, unique thermocycling parameter strategy dictates the + and - strand amplification cue. Each aPCR cycle includes two annealing and extension steps. Sequential annealing and extension of forward and reverse primers during each cycle produce transient single-stranded DNA (ssDNA) amplicons which help hybridization-based probes such as peptide nucleic acid (PNA) bind to the target sequences more effectively. This new method can be used in real-time quantitative PCR (qPCR) for gene expression analyses as well as production of robust ssDNA targets for microarray and other hybridization-based applications.
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43
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Bichenkova EV, Lang Z, Yu X, Rogert C, Douglas KT. DNA-mounted self-assembly: New approaches for genomic analysis and SNP detection. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2011; 1809:1-23. [PMID: 21111076 DOI: 10.1016/j.bbagrm.2010.11.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2010] [Revised: 11/07/2010] [Accepted: 11/12/2010] [Indexed: 11/25/2022]
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Richardson JA, Gerowska M, Shelbourne M, French D, Brown T. Six-Colour HyBeacon Probes for Multiplex Genetic Analysis. Chembiochem 2010; 11:2530-3. [DOI: 10.1002/cbic.201000623] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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45
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Gupta P, Langkjær N, Wengel J. Synthesis and biophysical studies of coronene functionalized 2'-amino-LNA: a novel class of fluorescent nucleic acids. Bioconjug Chem 2010; 21:513-20. [PMID: 20099893 DOI: 10.1021/bc900421r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Incorporation of 2'-N-(coronen-1-yl)methyl-2'-amino-LNA monomer X or 2'-N-4-(coronen-1-yl)-4-oxobutanoyl-2'-amino-LNA monomer Y into short DNA strands induces high binding affinity toward DNA or RNA and a marked red-shift in steady-state fluorescence emission upon hybridization to cDNA or RNA.
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Affiliation(s)
- Pankaj Gupta
- Nucleic Acid Center, Department of Physics and Chemistry, University of Southern Denmark, 5230 Odense M, Denmark
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46
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Ben Gaied N, Richardson JA, Singleton DG, Zhao Z, French D, Brown T. End-capped HyBeacon probes for the analysis of human genetic polymorphisms related to warfarin metabolism. Org Biomol Chem 2010; 8:2728-34. [DOI: 10.1039/c001177k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Liang X, Nishioka H, Mochizuki T, Asanuma H. An interstrand-wedged duplex composed of alternating DNAbase pairs and covalently attached intercalators. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/b915993b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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van Schie RMF, Wadelius M, Kamali F, Daly AK, Manolopoulos VG, de Boer A, Barallon R, Verhoef TI, Kirchheiner J, Haschke-Becher E, Briz M, Rosendaal FR, Redekop WK, Pirmohamed M, Maitland-van der Zee AH. Genotype-guided dosing of coumarin derivatives: the European pharmacogenetics of anticoagulant therapy (EU-PACT) trial design. Pharmacogenomics 2009; 10:1687-95. [DOI: 10.2217/pgs.09.125] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The narrow therapeutic range and wide interpatient variability in dose requirement make anticoagulation response to coumarin derivatives unpredictable. As a result, patients require frequent monitoring to avert adverse effects and maintain therapeutic efficacy. Polymorphisms in VKORC1 and CYP2C9 jointly account for about 40% of the interindividual variability in dose requirements. To date, several pharmacogenetic-guided dosing algorithms for coumarin derivatives, predominately for warfarin, have been developed. However, the potential benefit of these dosing algorithms in terms of their safety and clinical utility has not been adequately investigated in randomized settings. The European Pharmacogenetics of Anticoagulant Therapy (EU-PACT) trial will assess, in a single-blinded and randomized controlled trial with a follow-up period of 3 months, the safety and clinical utility of genotype-guided dosing in daily practice for the three main coumarin derivatives used in Europe. The primary outcome measure is the percentage time in the therapeutic range for international normalized ratio. This report describes the design and protocol for the trial.
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Affiliation(s)
| | | | | | - Ann K Daly
- Newcastle University, Newcastle upon Tyne, UK
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Xiao Y, Plakos KJI, Lou X, White RJ, Qian J, Plaxco KW, Soh HT. Fluorescence detection of single-nucleotide polymorphisms with a single, self-complementary, triple-stem DNA probe. Angew Chem Int Ed Engl 2009; 48:4354-8. [PMID: 19431180 DOI: 10.1002/anie.200900369] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Singled out for its singularity: In a single-step, single-component, fluorescence-based method for the detection of single-nucleotide polymorphisms at room temperature, the sensor is comprised of a single, self-complementary DNA strand that forms a triple-stem structure. The large conformational change that occurs upon binding to perfectly matched (PM) targets results in a significant increase in fluorescence (see picture; F = fluorophore, Q = quencher).
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Affiliation(s)
- Yi Xiao
- Materials Department, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
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50
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Xiao Y, Plakos K, Lou X, White R, Qian J, Plaxco K, Soh H. Fluorescence Detection of Single-Nucleotide Polymorphisms with a Single, Self-Complementary, Triple-Stem DNA Probe. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200900369] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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