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Singh R, Ryu J, Hyoung Lee W, Kang JH, Park S, Kim K. Wastewater-borne viruses and bacteria, surveillance and biosensors at the interface of academia and field deployment. Crit Rev Biotechnol 2024:1-21. [PMID: 38973015 DOI: 10.1080/07388551.2024.2354709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 04/28/2024] [Indexed: 07/09/2024]
Abstract
Wastewater is a complex, but an ideal, matrix for disease monitoring and surveillance as it represents the entire load of enteric pathogens from a local catchment area. It captures both clinical and community disease burdens. Global interest in wastewater surveillance has been growing rapidly for infectious diseases monitoring and for providing an early warning of potential outbreaks. Although molecular detection methods show high sensitivity and specificity in pathogen monitoring from wastewater, they are strongly limited by challenges, including expensive laboratory settings and prolonged sample processing and analysis. Alternatively, biosensors exhibit a wide range of practical utility in real-time monitoring of biological and chemical markers. However, field deployment of biosensors is primarily challenged by prolonged sample processing and pathogen concentration steps due to complex wastewater matrices. This review summarizes the role of wastewater surveillance and provides an overview of infectious viral and bacterial pathogens with cutting-edge technologies for their detection. It emphasizes the practical utility of biosensors in pathogen monitoring and the major bottlenecks for wastewater surveillance of pathogens, and overcoming approaches to field deployment of biosensors for real-time pathogen detection. Furthermore, the promising potential of novel machine learning algorithms to resolve uncertainties in wastewater data is discussed.
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Affiliation(s)
- Rajendra Singh
- Department of Biological and Environmental Science, Dongguk University, Goyang, Gyeonggi-do, South Korea
| | - Jaewon Ryu
- Department of Biological and Environmental Science, Dongguk University, Goyang, Gyeonggi-do, South Korea
| | - Woo Hyoung Lee
- Department of Civil, Environmental, and Construction Engineering, University of Central FL, Orlando, FL, USA
| | - Joo-Hyon Kang
- Department of Civil and Environmental Engineering, Dongguk University-Seoul, Seoul, South Korea
| | - Sanghwa Park
- Bacteria Research Team, Freshwater Bacteria Research Department, Nakdonggang National Institute of Biological Resources (NNIBR), Sangju-si, South Korea
| | - Keugtae Kim
- Department of Biological and Environmental Science, Dongguk University, Goyang, Gyeonggi-do, South Korea
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2
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Three-way junction DNA based electrochemical biosensor for microRNAs detection with distinguishable locked nucleic acid recognition and redox cycling signal amplification. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2020.114861] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Gao J, Li H, Torab P, Mach KE, Craft DW, Thomas NJ, Puleo CM, Liao JC, Wang TH, Wong PK. Nanotube assisted microwave electroporation for single cell pathogen identification and antimicrobial susceptibility testing. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2019; 17:246-253. [PMID: 30794964 DOI: 10.1016/j.nano.2019.01.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 01/29/2019] [Accepted: 01/31/2019] [Indexed: 01/12/2023]
Abstract
A nanotube assisted microwave electroporation (NAME) technique is demonstrated for delivering molecular biosensors into viable bacteria for multiplex single cell pathogen identification to advance rapid diagnostics in clinical microbiology. Due to the small volume of a bacterial cell (~femtoliter), the intracellular concentration of the target molecule is high, which results in a strong signal for single cell detection without amplification. The NAME procedure can be completed in as little as 30 minutes and can achieve over 90% transformation efficiency. We demonstrate the feasibility of NAME for identifying clinical isolates of bloodborne and uropathogenic pathogens and detecting bacterial pathogens directly from patient's samples. In conjunction with a microfluidic single cell trapping technique, NAME allows single cell pathogen identification and antimicrobial susceptibility testing concurrently. Using this approach, the time for microbiological analysis reduces from days to hours, which will have a significant impact on the clinical management of bacterial infections.
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Affiliation(s)
- Jian Gao
- Department of Biomedical Engineering, The Pennsylvania State University, University Park, PA, USA
| | - Hui Li
- Department of Biomedical Engineering, The Pennsylvania State University, University Park, PA, USA
| | - Peter Torab
- Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA, USA
| | - Kathleen E Mach
- Department of Urology, Stanford University School of Medicine, Stanford, CA, USA
| | - David W Craft
- Departmemt of Pathology and Laboratory Medicine, Penn State Milton S. Hershey Medical Center, Hershey, PA, USA
| | - Neal J Thomas
- Departments of Pediatrics and Public Health Sciences, Penn State University College of Medicine, Hershey, PA, USA
| | | | - Joseph C Liao
- Department of Urology, Stanford University School of Medicine, Stanford, CA, USA
| | - Tza-Huei Wang
- Departments of Mechanical Engineering and Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Pak Kin Wong
- Department of Biomedical Engineering, The Pennsylvania State University, University Park, PA, USA; Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA, USA; Department of Surgery, Penn State Milton S. Hershey Medical Center, Hershey, PA, USA.
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Abstract
Fluorogenic oligonucleotide probes that can produce a change in fluorescence signal upon binding to specific biomolecular targets, including nucleic acids as well as non-nucleic acid targets, such as proteins and small molecules, have applications in various important areas. These include diagnostics, drug development and as tools for studying biomolecular interactions in situ and in real time. The probes usually consist of a labeled oligonucleotide strand as a recognition element together with a mechanism for signal transduction that can translate the binding event into a measurable signal. While a number of strategies have been developed for the signal transduction, relatively little attention has been paid to the recognition element. Peptide nucleic acids (PNA) are DNA mimics with several favorable properties making them a potential alternative to natural nucleic acids for the development of fluorogenic probes, including their very strong and specific recognition and excellent chemical and biological stabilities in addition to their ability to bind to structured nucleic acid targets. In addition, the uncharged backbone of PNA allows for other unique designs that cannot be performed with oligonucleotides or analogues with negatively-charged backbones. This review aims to introduce the principle, showcase state-of-the-art technologies and update recent developments in the areas of fluorogenic PNA probes during the past 20 years.
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Affiliation(s)
- Tirayut Vilaivan
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Patumwan, Bangkok 10330, Thailand
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Goux E, Lespinasse Q, Guieu V, Perrier S, Ravelet C, Fiore E, Peyrin E. Fluorescence anisotropy-based structure-switching aptamer assay using a peptide nucleic acid (PNA) probe. Methods 2015; 97:69-74. [PMID: 26455538 DOI: 10.1016/j.ymeth.2015.09.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 09/04/2015] [Accepted: 09/18/2015] [Indexed: 01/04/2023] Open
Abstract
This study describes for the first time the feasibility of using peptide nucleic acids (PNAs) as an alternative to the DNA probes in structure-switching aptamer fluorescence polarisation assays. The effects of experimental parameters such as the length of the PNA strand, the nature of dye and the buffer conditions on the assay performances are first explored using two different methodologies based on the competition between the PNA/aptamer hydribridisation and the target/aptamer complexation. D-ATP can be detected from 1 to 25 μM in a linear range and a detection limit (LOD) of 3 μM can be reached. For this target, this lowers by a factor >5 the LOD reported with conventional DNA-based fluorescent structure switching aptamer-based assays and by a factor 3 the LOD observed with non-competitive fluorescent sensing platform indicating the usefulness of the PNA-based approach.
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Affiliation(s)
- Emma Goux
- Département de Pharmacochimie Moléculaire, Université Grenoble Alpes, UMR 5063 CNRS, ICMG FR 2607, Campus universitaire, Saint-Martin d'Hères, France
| | - Quentin Lespinasse
- Département de Pharmacochimie Moléculaire, Université Grenoble Alpes, UMR 5063 CNRS, ICMG FR 2607, Campus universitaire, Saint-Martin d'Hères, France
| | - Valérie Guieu
- Département de Pharmacochimie Moléculaire, Université Grenoble Alpes, UMR 5063 CNRS, ICMG FR 2607, Campus universitaire, Saint-Martin d'Hères, France.
| | - Sandrine Perrier
- Département de Pharmacochimie Moléculaire, Université Grenoble Alpes, UMR 5063 CNRS, ICMG FR 2607, Campus universitaire, Saint-Martin d'Hères, France
| | - Corinne Ravelet
- Département de Pharmacochimie Moléculaire, Université Grenoble Alpes, UMR 5063 CNRS, ICMG FR 2607, Campus universitaire, Saint-Martin d'Hères, France
| | - Emmanuelle Fiore
- Département de Pharmacochimie Moléculaire, Université Grenoble Alpes, UMR 5063 CNRS, ICMG FR 2607, Campus universitaire, Saint-Martin d'Hères, France
| | - Eric Peyrin
- Département de Pharmacochimie Moléculaire, Université Grenoble Alpes, UMR 5063 CNRS, ICMG FR 2607, Campus universitaire, Saint-Martin d'Hères, France.
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Karsten SL, Tarhan MC, Kudo LC, Collard D, Fujita H. Point-of-care (POC) devices by means of advanced MEMS. Talanta 2015; 145:55-9. [PMID: 26459443 DOI: 10.1016/j.talanta.2015.04.032] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 04/12/2015] [Indexed: 12/21/2022]
Abstract
Microelectromechanical systems (MEMS) have become an invaluable technology to advance the development of point-of-care (POC) devices for diagnostics and sample analyses. MEMS can transform sophisticated methods into compact and cost-effective microdevices that offer numerous advantages at many levels. Such devices include microchannels, microsensors, etc., that have been applied to various miniaturized POC products. Here we discuss some of the recent advances made in the use of MEMS devices for POC applications.
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Affiliation(s)
- Stanislav L Karsten
- NeuroInDx, Inc., E. 28th Street, Signal Hill, CA 90755, USA; Center for International Research on MicroMechatronics, Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
| | - Mehmet C Tarhan
- Center for International Research on MicroMechatronics, Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan; LIMMS/CNRS-IIS (UMI 2820), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Lili C Kudo
- NeuroInDx, Inc., E. 28th Street, Signal Hill, CA 90755, USA
| | - Dominique Collard
- Center for International Research on MicroMechatronics, Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan; LIMMS/CNRS-IIS (UMI 2820), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Hiroyuki Fujita
- Center for International Research on MicroMechatronics, Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Bertucci A, Manicardi A, Candiani A, Giannetti S, Cucinotta A, Spoto G, Konstantaki M, Pissadakis S, Selleri S, Corradini R. Detection of unamplified genomic DNA by a PNA-based microstructured optical fiber (MOF) Bragg-grating optofluidic system. Biosens Bioelectron 2014; 63:248-254. [PMID: 25104434 DOI: 10.1016/j.bios.2014.07.047] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Accepted: 07/16/2014] [Indexed: 12/22/2022]
Abstract
Microstructured optical fibers containing microchannels and Bragg grating inscribed were internally functionalized with a peptide nucleic acid (PNA) probe specific for a gene tract of the genetically modified Roundup Ready soy. These fibers were used as an optofluidic device for the detection of DNA by measuring the shift in the wavelength of the reflected IR light. Enhancement of optical read-out was obtained using streptavidin coated gold-nanoparticles interacting with the genomic DNA captured in the fiber channels (0%, 0.1%, 1% and 10% RR-Soy), enabling to achieve statistically significant, label-free, and amplification-free detection of target DNA in low concentrations, low percentages, and very low sample volumes. Computer simulations of the fiber optics based on the finite element method (FEM) were consistent with the formation of a layer of organic material with an average thickness of 39 nm for the highest percentage (10% RR soy) analysed.
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Affiliation(s)
- Alessandro Bertucci
- Dipartimento di Chimica, Università di Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
| | - Alex Manicardi
- Dipartimento di Chimica, Università di Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
| | - Alessandro Candiani
- Dipartimento di Ingegneria dell'Informazione, Università di Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
| | - Sara Giannetti
- Dipartimento di Ingegneria dell'Informazione, Università di Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
| | - Annamaria Cucinotta
- Dipartimento di Ingegneria dell'Informazione, Università di Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
| | - Giuseppe Spoto
- Dipartimento di Chimica, Università di Catania, Via Andrea Doria 6, 95125 Catania, Italy
| | - Maria Konstantaki
- Foundation for Research and Technology Hellas (FORTH), Institute of Electronic Structure and Laser (IESL), P.O. Box 1385, Heraklion 71 110, Greece
| | - Stavros Pissadakis
- Foundation for Research and Technology Hellas (FORTH), Institute of Electronic Structure and Laser (IESL), P.O. Box 1385, Heraklion 71 110, Greece
| | - Stefano Selleri
- Dipartimento di Ingegneria dell'Informazione, Università di Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy.
| | - Roberto Corradini
- Dipartimento di Chimica, Università di Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy.
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De A, Souchelnytskyi S, van den Berg A, Carlen ET. Peptide nucleic acid (PNA)-DNA duplexes: comparison of hybridization affinity between vertically and horizontally tethered PNA probes. ACS APPLIED MATERIALS & INTERFACES 2013; 5:4607-4612. [PMID: 23668364 DOI: 10.1021/am4011429] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We compare the PNA-DNA duplex hybridization characteristics of vertically tethered and new horizontally tethered PNA probes on solid surfaces. The horizontal 15-mer PNA probe has been synthesized with linker molecules attached at three locations (γ-points) positioned along the PNA backbone that provides covalent attachment of the probe with the backbone aligned parallel to the surface, which is important for DNA hybridization assays that use electric field effect sensors for detection. A radioactive labeled assay and real-time surface plasmon resonance (SPR) biosensor are used to assess the probe surface density, nonspecific binding, and DNA hybridization affinity, respectively, of the new PNA probe configuration. The estimated equilibrium dissociation constants of the horizontally tethered duplex and the vertically tethered duplex are of the same order of magnitude (KD ≈ 5 nM), which indicates a sufficient hybridization affinity for many electronic biosensors that benefit from the horizontal alignment, which minimizes the effects of counterion screening.
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Machado A, Almeida C, Salgueiro D, Henriques A, Vaneechoutte M, Haesebrouck F, Vieira MJ, Rodrigues L, Azevedo NF, Cerca N. Fluorescence in situ Hybridization method using Peptide Nucleic Acid probes for rapid detection of Lactobacillus and Gardnerella spp. BMC Microbiol 2013; 13:82. [PMID: 23586331 PMCID: PMC3637831 DOI: 10.1186/1471-2180-13-82] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Accepted: 03/27/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Bacterial vaginosis (BV) is a common vaginal infection occurring in women of reproductive age. It is widely accepted that the microbial switch from normal microflora to BV is characterized by a decrease in vaginal colonization by Lactobacillus species together with an increase of Gardnerella vaginalis and other anaerobes. Our goal was to develop and optimize a novel Peptide Nucleic Acid (PNA) Fluorescence in situ Hybridization assay (PNA FISH) for the detection of Lactobacillus spp. and G. vaginalis in mixed samples. RESULTS Therefore, we evaluated and validated two specific PNA probes by using 36 representative Lactobacillus strains, 22 representative G. vaginalis strains and 27 other taxonomically related or pathogenic bacterial strains commonly found in vaginal samples. The probes were also tested at different concentrations of G. vaginalis and Lactobacillus species in vitro, in the presence of a HeLa cell line. Specificity and sensitivity of the PNA probes were found to be 98.0% (95% confidence interval (CI), from 87.8 to 99.9%) and 100% (95% CI, from 88.0 to 100.0%), for Lactobacillus spp.; and 100% (95% CI, from 92.8 to 100%) and 100% (95% CI, from 81.5 to 100.0%) for G. vaginalis. Moreover, the probes were evaluated in mixed samples mimicking women with BV or normal vaginal microflora, demonstrating efficiency and applicability of our PNA FISH. CONCLUSIONS This quick method accurately detects Lactobacillus spp. and G. vaginalis species in mixed samples, thus enabling efficient evaluation of the two bacterial groups, most frequently encountered in the vagina.
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Affiliation(s)
- António Machado
- IBB - Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, University of Minho, Campus de Gualtar, Braga 4710-057, Portugal
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Abstract
The combined use of surface plasmon resonance (SPR) and modified or mimic oligonucleotides have expanded diagnostic capabilities of SPR-based biosensors and have allowed detailed studies of molecular recognition processes. This review summarizes the most significant advances made in this area over the past 15 years. Functional and conformationally restricted DNA analogs (e.g., aptamers and PNAs) when used as components of SPR biosensors contribute to enhance the biosensor sensitivity and selectivity. At the same time, the SPR technology brings advantages that allows forbetter exploration of underlying properties of non-natural nucleic acid structures such us DNAzymes, LNA and HNA.
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Affiliation(s)
- Roberta D'Agata
- Dipartimento di Scienze Chimiche, Università di Catania, Catania, Italy
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Manicardi A, Accetta A, Tedeschi T, Sforza S, Marchelli R, Corradini R. PNA bearing 5-azidomethyluracil: a novel approach for solid and solution phase modification. ARTIFICIAL DNA, PNA & XNA 2012; 3:53-62. [PMID: 22772040 PMCID: PMC3429531 DOI: 10.4161/adna.20158] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Fmoc- and Boc-protected modified monomers bearing 5-azidomethyluracil nucleobase were synthesized. Four different solid-phase synthetic strategies were tested in order to evaluate the application of this series of monomers for the solid-phase synthesis of modified PNA. The azide was used as masked amine for the introduction of amide-linked functional groups, allowing the production of a library of compounds starting from a single modified monomer. The azide function was also exploited as reactive group for the modification of PNA in solution via azide-alkyne click cycloaddition.
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Affiliation(s)
- Alex Manicardi
- Dipartimento di Chimica Organica e Industriale, Università di Parma, Parma, Italy.
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Zohar H, Muller SJ. Labeling DNA for single-molecule experiments: methods of labeling internal specific sequences on double-stranded DNA. NANOSCALE 2011; 3:3027-39. [PMID: 21734993 PMCID: PMC3322637 DOI: 10.1039/c1nr10280j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This review is a practical guide for experimentalists interested in specifically labeling internal sequences on double-stranded (ds) DNA molecules for single-molecule experiments. We describe six labeling approaches demonstrated in a single-molecule context and discuss the merits and drawbacks of each approach with particular attention to the amount of specialized training and reagents required. By evaluating each approach according to criteria relevant to single-molecule experiments, including labeling yield and compatibility with cofactors such as Mg(2+), we provide a simple reference for selecting a labeling method for given experimental constraints. Intended for non-specialists seeking accessible solutions to DNA labeling challenges, the approaches outlined emphasize simplicity, robustness, suitability for use by non-biologists, and utility in diverse single-molecule experiments.
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Affiliation(s)
- Hagar Zohar
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720, USA
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Zohar H, Hetherington CL, Bustamante C, Muller SJ. Peptide nucleic acids as tools for single-molecule sequence detection and manipulation. NANO LETTERS 2010; 10:4697-701. [PMID: 20923183 PMCID: PMC3322611 DOI: 10.1021/nl102986v] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The ability to strongly and sequence-specifically attach modifications such as fluorophores and haptens to individual double-stranded (ds) DNA molecules is critical to a variety of single-molecule experiments. We propose using modified peptide nucleic acids (PNAs) for this purpose and implement them in two model single-molecule experiments where individual DNA molecules are manipulated via microfluidic flow and optical tweezers, respectively. We demonstrate that PNAs are versatile and robust sequence-specific tethers.
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Affiliation(s)
- Hagar Zohar
- Department of Chemical Engineering, California Institute for Quantitative Biosciences, and Howard Hughes Medical InstituteUniversity of California, Berkeley, California 94720, United States
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Tariq MA, Pourmand N. Template tailoring: Accurate determination of heterozygous alleles using peptide nucleic acid and dideoxyNTP. Electrophoresis 2010; 31:1322-9. [PMID: 20408144 DOI: 10.1002/elps.200900631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Measurement of the length of DNA fragments plays a pivotal role in genetic mapping, disease diagnostics, human identification and forensic applications. PCR followed by electrophoresis is used for DNA length measurement of STRs, a process that requires labeled primers and allelic ladders as standards to avoid machine error. Sequencing-based approaches can be used for STR analysis to eliminate the requirement of labeled primers and allelic ladder. However, the limiting factor with this approach is unsynchronized polymerization in heterozygous sample analysis, in which alleles with different lengths can lead to imbalanced heterozygote peak height ratios. We have developed a rapid DNA length measurement method using peptide nucleic acid and dideoxy dNTPs to "tailor" DNA templates for accurate sequencing to overcome this hurdle. We also devised an accelerated "dyad" pyrosequencing strategy, such that the combined approach can be used as a faster, more accurate alternative to de novo sequencing. Dyad sequencing interrogates two bases at a time by allowing the polymerase to incorporate two nucleotides to DNA template, cutting the analysis time in half. In addition, for the first time, we show the effect of peptide nucleic acid as a blocking probe to stop polymerization, which is essential to analyze the heterozygous samples by sequencing. This approach provides a new platform for rapid and cost-effective DNA length measurement for STRs and resequencing of small DNA fragments.
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Affiliation(s)
- Muhammad Akram Tariq
- Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, CA, USA
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15
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Zhdanova NS, Rogozina YI, Minina YM, Borodin PM, Rubtsov NB. Telomeric DNA allocation in chromosomes of common shrew (Sorex araneus, eulipotyphla). ACTA ACUST UNITED AC 2009. [DOI: 10.1134/s1990519x09040038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Totsingan F, Tedeschi T, Sforza S, Corradini R, Marchelli R. Highly selective single nucleotide polymorphism recognition by a chiral (5S) PNA beacon. Chirality 2009; 21:245-53. [PMID: 18853465 DOI: 10.1002/chir.20659] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A chiral peptide nucleic acid (PNA) beacon containing a C-5 modified monomer based on L-lysine was synthesized. The terminal amino group of the lysine side chain was linked to a spacer for future applications on surfaces. The PNA beacon bears a carboxyfluorescein fluorophore and a dabcyl quencher at opposite ends. The DNA binding properties were compared with those of a homologous PNA beacon containing only achiral monomers. Both beacons underwent a fluorescence increase in the presence of complementary DNA, with higher efficiency and higher selectivity (evaluated using single mismatched DNA sequences) observed for the chiral monomer containing PNA. Ion exchange (IE) HPLC with fluorimetric detection was used in combination with the beacon for the selective detection of complementary DNA. A fluorescent peak corresponding to the PNA beacon:DNA duplex was observed at a very low detection limit (1 nM). The discriminating capacity of the chiral PNA beacon for a single mismatch was found to be superior to those observed with the unmodified one, thus confirming the potency of chirality for increasing the affinity and specificity of DNA recognition.
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Affiliation(s)
- Filbert Totsingan
- Dipartimento di Chimica Organica e Industriale Università di Parma, 43100 Parma, Italy
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17
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Cerqueira L, Azevedo NF, Almeida C, Jardim T, Keevil CW, Vieira MJ. DNA mimics for the rapid identification of microorganisms by fluorescence in situ hybridization (FISH). Int J Mol Sci 2008; 9:1944-60. [PMID: 19325728 PMCID: PMC2635612 DOI: 10.3390/ijms9101944] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2008] [Revised: 09/24/2008] [Accepted: 10/06/2008] [Indexed: 12/23/2022] Open
Abstract
Fluorescence in situ hybridization (FISH) is a well-established technique that is used for a variety of purposes, ranging from pathogen detection in clinical diagnostics to the determination of chromosomal stability in stem cell research. The key step of FISH involves the detection of a nucleic acid region and as such, DNA molecules have typically been used to probe for the sequences of interest. However, since the turn of the century, an increasing number of laboratories have started to move on to the more robust DNA mimics methods, most notably peptide and locked nucleic acids (PNA and LNA). In this review, we will cover the state-of-the-art of the different DNA mimics in regard to their application as efficient markers for the presence of individual microbial cells, and consider their potential advantages and pitfalls. Available PNA probes are then reassessed in terms of sensitivity and specificity using rRNA databases. In addition, we also attempt to predict the applicability of DNA mimics in well-known techniques attempting to detect in situ low number of copies of specific nucleic acid sequences such as catalyzed reporter deposition (CARD) and recognition of individual genes (RING) FISH.
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Affiliation(s)
- Laura Cerqueira
- IBB - Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar 4710-057, Braga, Portugal. E-Mails:
(L. C.);
(C. A.);
(T. J.);
(M. V.)
| | - Nuno F. Azevedo
- IBB - Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar 4710-057, Braga, Portugal. E-Mails:
(L. C.);
(C. A.);
(T. J.);
(M. V.)
- Environmental Healthcare Unit, School of Biological Sciences, University of Southampton, Bassett Crescent East, Southampton SO16 7PX, UK. E-Mail:
(N. A.)
- Author to whom correspondence should be addressed; E-Mail:
; Tel. +351-253605413; Fax: +351-253678986
| | - Carina Almeida
- IBB - Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar 4710-057, Braga, Portugal. E-Mails:
(L. C.);
(C. A.);
(T. J.);
(M. V.)
- Environmental Healthcare Unit, School of Biological Sciences, University of Southampton, Bassett Crescent East, Southampton SO16 7PX, UK. E-Mail:
(N. A.)
| | - Tatiana Jardim
- IBB - Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar 4710-057, Braga, Portugal. E-Mails:
(L. C.);
(C. A.);
(T. J.);
(M. V.)
| | - Charles William Keevil
- Environmental Healthcare Unit, School of Biological Sciences, University of Southampton, Bassett Crescent East, Southampton SO16 7PX, UK. E-Mail:
(N. A.)
| | - Maria J. Vieira
- IBB - Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar 4710-057, Braga, Portugal. E-Mails:
(L. C.);
(C. A.);
(T. J.);
(M. V.)
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18
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Totsingan F, Rossi S, Corradini R, Tedeschi T, Sforza S, Juris A, Scaravelli E, Marchelli R. Label-free selective DNA detection with high mismatch recognition by PNA beacons and ion exchange HPLC. Org Biomol Chem 2008; 6:1232-7. [PMID: 18362963 DOI: 10.1039/b718772f] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two 11mer peptide nucleic acid (PNA) beacons were synthesized and tested for the detection of full-matched or single mismatched DNA. Fluorescent measurements carried out in solution showed only partial discrimination of the mismatched sequence, while using anion-exchange HPLC, in combination with fluorimetric detection, allowed DNA analysis to be performed with high sensitivity and extremely high sequence selectivity. Up to >90 : 1 signal discrimination in the presence of one single mismatched base was observed. The analysis was tested on both short and long DNA oligomers. Detection of DNA obtained from PCR amplification was also performed allowing the selective detection of the target sequence in complex mixtures. Label free detection of the DNA with high sequence selectivity is therefore possible using the present approach.
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Affiliation(s)
- Filbert Totsingan
- Dipartimento di Chimica Organica e Industriale-Università di Parma, Viale G.P. Usberti 17/a-I43100, Parma, Italy
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19
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DNA oligonucleotide-assisted genetic manipulation increases transformation and homologous recombination efficiencies: Evidence from gene targeting of Dictyostelium discoideum. J Biotechnol 2007; 133:418-23. [PMID: 18160166 DOI: 10.1016/j.jbiotec.2007.11.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2007] [Revised: 10/29/2007] [Accepted: 11/12/2007] [Indexed: 11/23/2022]
Abstract
Artificial gene alteration by homologous recombination in living cells, termed gene targeting, presents fundamental and considerable knowledge of in vivo gene function. In principle, this method can possibly be applied to any type of genes and transformable cells. However, its success is limited due to a low frequency of homologous recombination between endogenous targeted gene and exogenous transgene. Here, we describe a general gene-targeting method in which co-transformation of DNA oligonucleotides (oligomers) could significantly increase the homologous recombination frequency and transformation efficiency. The oligomers were simply designed such that they were identical to both the ends of the homologous flanking regions of the targeting construct. Using this strategy, both targeted alleles of diploid cells were simultaneously replaced in a single transformation procedure. Thus, the simplicity and versatility of this method applicable to any type of cell may increase the application of gene targeting.
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20
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Semsei I, Maier S, Workman-Azbill J, Urbán L, Moser K, Zeher M, Bachmann M, Farris AD. Detection of a rare oligo(A) repeat tract mutation (8As-->7As) in the sequence encoding the La/SS-B autoantigen. Anal Biochem 2007; 370:47-53. [PMID: 17663983 PMCID: PMC2597489 DOI: 10.1016/j.ab.2007.06.041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2007] [Revised: 06/12/2007] [Accepted: 06/28/2007] [Indexed: 01/27/2023]
Abstract
Several diseases are characterized by the presence of point mutations, which are amenable to molecular detection using a number of methods such as PCR. However, certain mutations are particularly difficult to detect due to factors such as low abundance and the presence of special (e.g., oligonucleotide repeat) sequences. The mutation 7A in the oligoA sequence of exon 7 of the gene encoding the La autoantigen is difficult to detect at the DNA level, and even at the RNA level, due to both its estimated low abundance and its differentiation from the wild-type 8A sequence. This article describes a technique in which amplification of the excess wild-type 8A La sequence is suppressed by a peptide nucleic acid (PNA) during a nested PCR step. Detection of the amplified 7A mutant form was then performed by simple electrophoresis following a final primer extension step with an infrared dye-labeled primer. This technique allowed us to detect the mutation in 3 of 7 individuals harboring serum immunoglobulin G (IgG) antibodies reactive with a neo-B cell epitope in the 7A mutant protein product. We propose that this method is a viable screening test for mutations in regions containing simple polynucleotide repeats.
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Affiliation(s)
- Imre Semsei
- Molecular Biology Research Laboratory, 3rd Department of Medicine, Medical and Health Science Center, University of Debrecen, H-4004 Debrecen, Hungary.
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21
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Corradini R, Sforza S, Tedeschi T, Marchelli R. Chirality as a tool in nucleic acid recognition: principles and relevance in biotechnology and in medicinal chemistry. Chirality 2007; 19:269-94. [PMID: 17345563 DOI: 10.1002/chir.20372] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The understanding of the interaction of chiral species with DNA or RNA is very important for the development of new tools in biology and of new drugs. Several cases in which chirality is a crucial point in determining the DNA binding mode are reviewed and discussed, with the aim of illustrating how chirality can be considered as a tool for improving the understanding of mechanisms and the effectiveness of nucleic acid recognition. The review is divided into two parts: the former describes examples of chiral species interacting with DNA: intercalators, metal complexes, and groove binders; the latter part is dedicated to chirality in DNA analogs, with discussion of phosphate stereochemistry and chirality of ribose substitutes, in particular of peptide nucleic acids (PNAs) for which a number of works have been published recently dealing with the effect of chirality in DNA recognition. The discussion is intended to show how enantiomeric recognition originates at the molecular level, by exploiting the enormous progresses recently achieved in the field of structural characterization of complexes formed by nucleic acid with their ligands by crystallographic and spectroscopic methods. Examples of application of the DNA binding molecules described and the role of chirality in DNA recognition relevant for biotechnology or medicinal chemistry are reported.
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Affiliation(s)
- Roberto Corradini
- Dipartimento di Chimica Organica e Industriale, Università di Parma, I-4310 Parma, Italy.
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22
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Kosiova I, Janicova A, Kois P. Synthesis of coumarin or ferrocene labeled nucleosides via Staudinger ligation. Beilstein J Org Chem 2006; 2:23. [PMID: 17137496 PMCID: PMC1779791 DOI: 10.1186/1860-5397-2-23] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2006] [Accepted: 11/30/2006] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Reaction of azides with triaryl phosphines under mild conditions gives iminophosphoranes which can react with almost any kind of electrophilic reagent, e.g. aldehydes/ketones to form imines or esters to form amides. This so-called Staudinger ligation has been employed in a wide range of applications as a general tool for bioconjugation including specific labeling of nucleic acids. RESULTS A new approach for the preparation of labeled nucleosides via intermolecular Staudinger ligation is described. Reaction of azidonucleosides with triphenylphosphine lead to iminophosphorane intermediates, which react subsequently with derivatives of coumarin or ferrocene to form coumarin or ferrocene labeled nucleosides. Fluorescent properties of coumarin labeled nucleosides are determined. CONCLUSION New coumarin and ferrocene labeled nucleosides were prepared via intermolecular Staudinger ligation. This reaction joins the fluorescent coumarin and biospecific nucleoside to the new molecule with promising fluorescent and electrochemical properties. The isolated yields of products depend on the structure of azidonucleoside and carboxylic acids. A detailed study of the kinetics of the Staudinger ligation with nucleoside substrates is in progress.
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Affiliation(s)
- Ivana Kosiova
- Comenius University, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynska dolina, Pavilon CH2, SK-84215 Bratislava, Slovak Republic
| | - Andrea Janicova
- Comenius University, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynska dolina, Pavilon CH2, SK-84215 Bratislava, Slovak Republic
| | - Pavol Kois
- Comenius University, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynska dolina, Pavilon CH2, SK-84215 Bratislava, Slovak Republic
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23
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Decousser JW, Methlouthi I, Pina P, Collignon A, Allouch P. New real-time PCR assay using locked nucleic acid probes to assess prevalence of ParC mutations in fluoroquinolone-susceptible Streptococcus pneumoniae isolates from France. Antimicrob Agents Chemother 2006; 50:1594-8. [PMID: 16569894 PMCID: PMC1426917 DOI: 10.1128/aac.50.4.1594-1598.2006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A real-time PCR assay with locked nucleic acid probes was developed to screen mutations at codons 79 and 83 of the Streptococcus pneumoniae parC gene. Only silent mutations were detected among 236 French invasive fluoroquinolone-susceptible strains. This test could be useful for some high-risk patients or in national surveys.
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Affiliation(s)
- Jean-Winoc Decousser
- Laboratoire de Biologie, Centre Hospitalier de Dourdan, 2 Rue du Potelet, 91415 Dourdan, France.
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24
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Jepsen JS, Sørensen MD, Wengel J. Locked nucleic acid: a potent nucleic acid analog in therapeutics and biotechnology. Oligonucleotides 2005; 14:130-46. [PMID: 15294076 DOI: 10.1089/1545457041526317] [Citation(s) in RCA: 138] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Locked nucleic acid (LNA) is a class of nucleic acid analogs possessing very high affinity and excellent specificity toward complementary DNA and RNA, and LNA oligonucleotides have been applied as antisense molecules both in vitro and in vivo. In this review, we briefly describe the basic physiochemical properties of LNA and some of the difficulties that may be encountered when applying LNA technology. The central part of the review focuses on the use of LNA molecules in regulation of gene expression, including delivery to cells, stability, unspecific effects, toxicity, pharmacokinetics, and design of LNA oligonucleotides. The last part evaluates LNA as a diagnostic tool in genotyping.
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Affiliation(s)
- Jan Stenvang Jepsen
- Department of Tumor Endocrinology, Institute of Cancer Biology, Danish Cancer Society, DK-2100, Copenhagen, Denmark.
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25
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Smolina IV, Demidov VV, Cantor CR, Broude NE. Real-time monitoring of branched rolling-circle DNA amplification with peptide nucleic acid beacon. Anal Biochem 2005; 335:326-9. [PMID: 15556572 DOI: 10.1016/j.ab.2004.07.022] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2004] [Indexed: 10/26/2022]
Affiliation(s)
- Irina V Smolina
- Center for Advanced Biotechnology, Boston University, Boston, MA 02215, USA
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26
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Ahmadian A, Ehn M, Hober S. Pyrosequencing: history, biochemistry and future. Clin Chim Acta 2005; 363:83-94. [PMID: 16165119 DOI: 10.1016/j.cccn.2005.04.038] [Citation(s) in RCA: 243] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2005] [Accepted: 04/27/2005] [Indexed: 01/21/2023]
Abstract
BACKGROUND Pyrosequencing is a DNA sequencing technology based on the sequencing-by-synthesis principle. METHODS The technique is built on a 4-enzyme real-time monitoring of DNA synthesis by bioluminescence using a cascade that upon nucleotide incorporation ends in a detectable light signal (bioluminescence). The detection system is based on the pyrophosphate released when a nucleotide is introduced in the DNA-strand. Thereby, the signal can be quantitatively connected to the number of bases added. Currently, the technique is limited to analysis of short DNA sequences exemplified by single-nucleotide polymorphism analysis and genotyping. Mutation detection and single-nucleotide polymorphism genotyping require screening of large samples of materials and therefore the importance of high-throughput DNA analysis techniques is significant. In order to expand the field for pyrosequencing, the read length needs to be improved. CONCLUSIONS Th pyrosequencing system is based on an enzymatic system. There are different current and future applications of this technique.
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Affiliation(s)
- Afshin Ahmadian
- Department of Biotechnology, Royal Institute of Technology (KTH), Stockholm, Sweden
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27
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Special-Purpose Modifications and Immobilized Functional Nucleic Acids for Biomolecular Interactions. Top Curr Chem (Cham) 2005. [DOI: 10.1007/b136673] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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28
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Op den Buijsch RAM, de Vries JE, Loots WJG, Landt O, Wijnen PAHM, van Dieijen-Visser MP, Bekers O. Genotyping of the PXR A11156C polymorphism with locked nucleic acid containing fluorogenic probes. THE PHARMACOGENOMICS JOURNAL 2005; 5:72-4. [PMID: 15772695 DOI: 10.1038/sj.tpj.6500299] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- R A M Op den Buijsch
- Department of Clinical Chemistry, University Hospital Maastricht, The Netherlands
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29
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Gauglitz G. Direct optical sensors: principles and selected applications. Anal Bioanal Chem 2004; 381:141-55. [PMID: 15700161 DOI: 10.1007/s00216-004-2895-4] [Citation(s) in RCA: 118] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2004] [Revised: 10/11/2004] [Accepted: 10/11/2004] [Indexed: 10/26/2022]
Abstract
In the field of bio and chemosensors a large number of detection principles has been published within the last decade. These detection principles are based either on the observation of fluorescence-labelled systems or on direct optical detection in the heterogeneous phase. Direct optical detection can be measured by remission (absorption of reflected radiation, opt(r)odes), by measuring micro-refractivity, or measuring interference. In the last case either Mach-Zehnder interferometers or measurement of changes in the physical thickness of the layer (measuring micro-reflectivity) caused, e.g., by swelling effects in polymers (due to interaction with analytes) or in bioassays (due to affinity reactions) also play an important role. Here, an overview of methods of microrefractometric and microreflectometric principles is given and benefits and drawbacks of the various approaches are demonstrated using samples from the chemo and biosensor field. The quality of sensors does not just depend on transduction principles but on the total sensor system defined by this transduction, the sensitive layer, data acquisition electronics, and evaluation software. The intention of this article is, therefore, to demonstrate the essentials of the interaction of these parts within the system, and the focus is on optical sensing using planar transducers, because fibre optical sensors have been reviewed in this journal only recently. Lack of selectivity of chemosensors can be compensated either by the use of sensor arrays or by evaluating time-resolved measurements of analyte/sensitive layer interaction. In both cases chemometrics enables the quantification of analyte mixtures. These data-processing methods have also been successfully applied to antibody/antigen interactions even using cross-reactive antibodies. Because miniaturisation and parallelisation are essential approaches in recent years, some aspects and current trends, especially for bio-applications, will be discussed. Miniaturisation is especially well covered in the literature.
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Affiliation(s)
- Guenter Gauglitz
- Institute of Physical and Theoretical Chemistry, University of Tuebingen, Auf der Morgenstelle 8, 72076 Tuebingen, Germany.
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30
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Wang S, Gaylord BS, Bazan GC. Fluorescein Provides a Resonance Gate for FRET from Conjugated Polymers to DNA Intercalated Dyes. J Am Chem Soc 2004; 126:5446-51. [PMID: 15113216 DOI: 10.1021/ja035550m] [Citation(s) in RCA: 186] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fluorescence spectra show that excitation of the cationic water-soluble conjugated polymer poly[(1,4-phenylene)-2,7-[9,9-bis(6'-N,N,N-trimethylammonium)-hexyl]fluorene diiodide] (1) results in inefficient fluorescence resonance energy transfer (FRET) to ethidium bromide (EB) intercalated within double-stranded DNA (dsDNA). When fluorescein (Fl) is attached to one terminus of the dsDNA, there is efficient FRET from 1 through Fl to EB. The cascading energy-transfer process was examined mechanistically via fluorescence decay kinetics and fluorescence anisotropy measurements. These experiments show that the proximity and conformational freedom of Fl provide a FRET gate to dyes intercalated within DNA which are optically amplified by the properties of the conjugated polymer. The overall process provides a substantial improvement over previous homogeneous conjugated polymer based DNA sensors, namely, in the form of improved selectivity.
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Affiliation(s)
- Shu Wang
- Department of Chemistry, Institute for Polymers and Organic Solids, University of California, Santa Barbara, California 93106, USA
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31
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Hertoghs KML, Ellis JH, Catchpole IR. Use of locked nucleic acid oligonucleotides to add functionality to plasmid DNA. Nucleic Acids Res 2004; 31:5817-30. [PMID: 14530430 PMCID: PMC219479 DOI: 10.1093/nar/gkg801] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The available reagents for the attachment of functional moieties to plasmid DNA are limiting. Most reagents bind plasmid DNA in a non-sequence- specific manner, with undefined stoichiometry, and affect DNA charge and delivery properties or involve chemical modifications that abolish gene expression. The design and ability of oligonucleotides (ODNs) containing locked nucleic acids (LNAs) to bind supercoiled, double-stranded plasmid DNA in a sequence-specific manner are described for the first time. The main mechanism for LNA ODNs binding plasmid DNA is demonstrated to be by strand displacement. LNA ODNs are more stably bound to plasmid DNA than similar peptide nucleic acid (PNA) 'clamps' for procedures such as particle-mediated DNA delivery (gene gun). It is shown that LNA ODNs remain associated with plasmid DNA after cationic lipid-mediated transfection into mammalian cells. LNA ODNs can bind to DNA in a sequence-specific manner so that binding does not interfere with plasmid conformation or gene expression. Attachment of CpG-based immune adjuvants to plasmid by 'hybrid' phosphorothioate-LNA ODNs induces tumour necrosis factor-alpha production in the macrophage cell line RAW264.7. This observation exemplifies an important new, controllable methodology for adding functionality to plasmids for gene delivery and DNA vaccination.
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Affiliation(s)
- Kirsten M L Hertoghs
- Department of Gene and Protein Therapeutics, Discovery Research, GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
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32
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Zhu L, Lukeman PS, Canary JW, Seeman NC. Nylon/DNA: Single-stranded DNA with a covalently stitched nylon lining. J Am Chem Soc 2003; 125:10178-9. [PMID: 12926933 DOI: 10.1021/ja035186r] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The synthesis of DNA/nylon ladder oligomers is described. Three stages of the development are addressed: the synthesis of 2'-beta-substituted phosphoramidites, the deprotection/purification protocols of ODNs modified with both amino and carboxyl groups, and amide bond-forming reactions on the ODNs. The established technology and the novel DNA-based ladder oligomer structure opens a pathway to the synthesis of topological molecular objects and networks templated by DNA through versatile DNA nanotechnology. The DNA-based ladder oligomers may find application in the antisense area.
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Affiliation(s)
- Lei Zhu
- Department of Chemistry, New York University, New York, New York 10003, USA
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