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Tao Y, Zhao Y, Wang L, Huang J, Chen Y, Huang Q, Song B, Li HY, Chen J, Liu H. Flexible Amperometric Immunosensor Based on Colloidal Quantum Dots for Detecting the Myeloperoxidase (MPO) Systemic Inflammation Biomarker. BIOSENSORS 2023; 13:255. [PMID: 36832021 PMCID: PMC9954662 DOI: 10.3390/bios13020255] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 02/07/2023] [Accepted: 02/08/2023] [Indexed: 06/18/2023]
Abstract
Myeloperoxidase (MPO) has been demonstrated to be a biomarker of neutrophilic inflammation in various diseases. Rapid detection and quantitative analysis of MPO are of great significance for human health. Herein, an MPO protein flexible amperometric immunosensor based on a colloidal quantum dot (CQD)-modified electrode was demonstrated. The remarkable surface activity of CQDs allows them to bind directly and stably to the surface of proteins and to convert antigen-antibody specific binding reactions into significant currents. The flexible amperometric immunosensor provides quantitative analysis of MPO protein with an ultra-low limit of detection (LOD) (31.6 fg mL-1), as well as good reproducibility and stability. The detection method is expected to be applied in clinical examination, POCT (bedside test), community physical examination, home self-examination and other practical scenarios.
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Affiliation(s)
- Yanbing Tao
- School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yunong Zhao
- School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Le Wang
- School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jing Huang
- School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yan Chen
- CHINALLERGY Biotech Co., Ltd., Wuhan Institute of Biotechnology, 666 Gaoxin Road, Wuhan 430079, China
| | - Qing Huang
- School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Boxiang Song
- School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Hua-Yao Li
- School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, China
- Wenzhou Institute of Advanced Manufacturing Technology, Huazhong University of Science and Technology, Wenzhou 325000, China
| | - Jianjun Chen
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Huan Liu
- School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, China
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2
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Green MR, Sambrook J. Preparation of Labeled DNA, RNA, and Oligonucleotide Probes. Cold Spring Harb Protoc 2022; 2022:2022/1/pdb.top100578. [PMID: 34983861 DOI: 10.1101/pdb.top100578] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Labeled nucleic acids and oligonucleotides are typically generated by enzymatic methods such as end-labeling, random priming, nick translation, in vitro transcription, and variations of the polymerase chain reaction (PCR). Some of these methods place the label in specific locations within the nucleic acid (e.g., at the 5' or 3' terminus); others generate molecules that are labeled internally at multiple sites. Some methods yield labeled single-stranded products, whereas others generate double-stranded nucleic acids. Finally, some generate probes of defined length, whereas others yield a heterogeneous population of labeled molecules. Options available for generating and detecting labeled nucleic acids, as well as advice on designing oligonucleotides for use as probes, is included here.
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3
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Abstract
Studying the catalytic behavior of biocatalysts under different conditions including temperature, buffer conditions, and cofactor concentrations is an important tool to understand their reaction mechanism. We describe two protocols that allow for the investigation of the catalysis of RNA-cleaving DNAzymes. The techniques include the use of FRET-labeled RNA substrates for studying the RNA-cleavage reaction in real-time under high throughput as well as RNA substrates labeled with a fluorescein molecule at the 5' end for gel-based assays. Both methods allow for an accurate determination of rate constants given a reaction model.
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Affiliation(s)
- Hannah Rosenbach
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Gerhard Steger
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany.
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4
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Liang P, Canoura J, Yu H, Alkhamis O, Xiao Y. Dithiothreitol-Regulated Coverage of Oligonucleotide-Modified Gold Nanoparticles To Achieve Optimized Biosensor Performance. ACS APPLIED MATERIALS & INTERFACES 2018; 10:4233-4242. [PMID: 29313333 PMCID: PMC5794567 DOI: 10.1021/acsami.7b16914] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
DNA-modified gold nanoparticles (AuNPs) are useful signal-reporters for detecting diverse molecules through various hybridization- and enzyme-based assays. However, their performance is heavily dependent on the probe DNA surface coverage, which can influence both target binding and enzymatic processing of the bound probes. Current methods used to adjust the surface coverage of DNA-modified AuNPs require the production of multiple batches of AuNPs under different conditions, which is costly and laborious. We here develop a single-step assay utilizing dithiothreitol (DTT) to fine-tune the surface coverage of DNA-modified AuNPs. DTT is superior to the commonly used surface diluent, mercaptohexanol, as it is less volatile, allowing for the rapid and reproducible controlling of surface coverage on AuNPs with only micromolar concentrations of DTT. Upon adsorption, DTT forms a dense monolayer on gold surfaces, which provides antifouling capabilities. Furthermore, surface-bound DTT adopts a cyclic conformation, which reorients DNA probes into an upright position and provides ample space to promote DNA hybridization, aptamer assembly, and nuclease digestion. We demonstrate the effects of surface coverage on AuNP-based sensors using DTT-regulated DNA-modified AuNPs. We then use these AuNPs to visually detect DNA and cocaine in colorimetric assays based on enzyme-mediated AuNP aggregation. We determine that DTT-regulated AuNPs with lower surface coverage achieve shorter reaction times and lower detection limits relative to those for assays using untreated AuNPs or DTT-regulated AuNPs with high surface coverage. Additionally, we demonstrate that our DTT-regulated AuNPs can perform cocaine detection in 50% urine without any significant matrix effects. We believe that DTT regulation of surface coverage can be broadly employed for optimizing DNA-modified AuNP performance for use in biosensors as well as drug delivery and therapeutic applications.
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Affiliation(s)
| | | | | | | | - Yi Xiao
- Corresponding Author: . Tel: 305-348-4536
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5
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Gomes-Neto JC, Mantz S, Held K, Sinha R, Segura Munoz RR, Schmaltz R, Benson AK, Walter J, Ramer-Tait AE. A real-time PCR assay for accurate quantification of the individual members of the Altered Schaedler Flora microbiota in gnotobiotic mice. J Microbiol Methods 2017; 135:52-62. [PMID: 28189782 DOI: 10.1016/j.mimet.2017.02.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 01/31/2017] [Accepted: 02/07/2017] [Indexed: 01/22/2023]
Abstract
Changes in the gastrointestinal microbial community are frequently associated with chronic diseases such as Inflammatory Bowel Diseases. However, understanding the relationship of any individual taxon within the community to host physiology is made complex due to the diversity and individuality of the gut microbiota. Defined microbial communities such as the Altered Schaedler Flora (ASF) help alleviate the challenges of a diverse microbiota by allowing one to interrogate the relationship between individual bacterial species and host responses. An important aspect of studying these relationships with defined microbial communities is the ability to measure the population abundance and dynamics of each member. Herein, we describe the development of an improved ASF species-specific and sensitive real-time quantitative polymerase chain reaction (qPCR) for use with SYBR Green chemistry to accurately assess individual ASF member abundance. This approach targets hypervariable regions V1 through V3 of the 16S rRNA gene of each ASF taxon to enhance assay specificity. We demonstrate the reproducibility, sensitivity and application of this new method by quantifying each ASF bacterium in two inbred mouse lines. We also used it to assess changes in ASF member abundance before and after acute antibiotic perturbation of the community as well as in mice fed two different diets. Additionally, we describe a nested PCR assay for the detection of lowly abundant ASF members. Altogether, this improved qPCR method will facilitate gnotobiotic research involving the ASF community by allowing for reproducible quantification of its members under various physiological conditions.
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Affiliation(s)
- João Carlos Gomes-Neto
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Sara Mantz
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Kyler Held
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Rohita Sinha
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Rafael R Segura Munoz
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Robert Schmaltz
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Andrew K Benson
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Jens Walter
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada; Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada
| | - Amanda E Ramer-Tait
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE, USA.
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6
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Biswal SL, Raorane D, Chaiken A, Majumdar A. Using a Microcantilever Array for Detecting Phase Transitions and Stability of DNA. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.jala.2006.06.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the extension of the microcantilever platform to study the thermal phase transition of biomolecules as they are heated. Microcantilever-based sensors directly translate changes in Gibbs free energy due to macromolecular interactions into mechanical responses. We observe surface stress changes in response to thermal dehybridization of double-stranded DNA oligonucleotides that are attached onto one side of a microcantilever. Once the cantilever is heated, the DNA undergoes a transition as the complementary strand melts, which results in changes in the cantilever deflection. This deflection is due to changes in the electrostatic, ionic, and hydration interaction forces between the remaining immobilized DNA strands. This new technique has allowed us to probe DNA melting dynamics and leads to a better understanding of the stability of DNA complexes on surfaces. (JALA 2006;11:222–6)
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7
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Bronkhorst AJ, Wentzel JF, Aucamp J, van Dyk E, du Plessis L, Pretorius PJ. Characterization of the cell-free DNA released by cultured cancer cells. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1863:157-65. [PMID: 26529550 DOI: 10.1016/j.bbamcr.2015.10.022] [Citation(s) in RCA: 128] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 10/22/2015] [Accepted: 10/30/2015] [Indexed: 01/08/2023]
Abstract
The most prominent factor that delays the translation of cell-free DNA (cfDNA) analyses to clinical practice is the lack of knowledge regarding its origin and composition. The elucidation of the former is complicated by the seemingly random fluctuation of quantitative and qualitative characteristics of cfDNA in the blood of healthy and diseased individuals. Besides methodological discrepancies, this could be ascribed to a web of cellular responses to various environmental cues and stressors. Since all cells release cfDNA, it follows that the cfDNA in the blood of cancer patients is not only representative of tumor derived DNA, but also of DNA released by healthy cells under different conditions. Additionally, cfDNA released by malignant cells is not necessarily just aberrant, but likely includes non-mutated chromosomal DNA fragments. This may cause false positive/negative results. Although many have acknowledged that this is a major problem, few have addressed it. We propose that many of the current stumbling blocks encountered in in vivo cfDNA studies can be partially circumvented by in vitro models. Accordingly, the purpose of this work was to evaluate the release of cfDNA from cultured cells and to gauge its potential use for elucidating the nature of cfDNA. Results suggest that the occurrence of cfDNA is not a consequence of apoptosis or necrosis, but primarily a result of actively secreted DNA, perhaps in association with a protein complex. This study demonstrates the potential of in vitro cell culture models to obtain useful information about the phenomenon of cfDNA.
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Affiliation(s)
- Abel Jacobus Bronkhorst
- Centre for Human Metabolomics, Biochemistry Division, North-West University, Potchefstroom 2520, South Africa.
| | - Johannes F Wentzel
- Centre of Excellence for Pharmaceutical Sciences (PHARMACEN), North-West University, Potchefstroom 2520, South Africa
| | - Janine Aucamp
- Centre for Human Metabolomics, Biochemistry Division, North-West University, Potchefstroom 2520, South Africa
| | - Etresia van Dyk
- Centre for Human Metabolomics, Biochemistry Division, North-West University, Potchefstroom 2520, South Africa
| | - Lissinda du Plessis
- Centre of Excellence for Pharmaceutical Sciences (PHARMACEN), North-West University, Potchefstroom 2520, South Africa
| | - Piet J Pretorius
- Centre for Human Metabolomics, Biochemistry Division, North-West University, Potchefstroom 2520, South Africa
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8
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Ultrasensitive determination of DNA sequences by flow injection chemiluminescence using silver ions as labels. Anal Chim Acta 2014; 848:67-73. [DOI: 10.1016/j.aca.2014.07.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 07/17/2014] [Accepted: 07/22/2014] [Indexed: 01/04/2023]
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9
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Comparative Assessment of Transient Exposure of Paclitaxel or Zotarolimus on In Vitro Vascular Cell Death, Proliferation, Migration, and Proinflammatory Biomarker Expression. J Cardiovasc Pharmacol 2012; 60:179-86. [DOI: 10.1097/fjc.0b013e31825aa742] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Influence of DNA–dye complex stability on separation resolution in microchip electrophoresis. Bioanalysis 2012; 4:693-701. [DOI: 10.4155/bio.12.6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Background: Different markers have been used to label DNA for sample detection in gel electrophoresis. Intercalating dyes, (e.g., YOYO) have been widely used to label DNA for sample detection, because they do not require the use of radioisotopes, covalent attachment or enzyme reactions. The labeling of DNA fragments can be achieved by simply mixing solutions of the intercalating dye and DNA sample. However, the separation quality of DNA labeled with intercalating dyes is greatly influenced by the buffer used, which affects the DNA–dye complex stability. Results: In this study, we investigated the effects of DNA–dye complex stability on separation resolution of dsDNA migrating in a photopolymerized polyacrylamide gel by measuring mobility and dispersion coefficients on a microfluidic chip and comparing predicted separation resolution under different dye and buffer conditions. Conclusion: We found that a buffer containing tetrapentylammonium (NPe4 +) yielded better separation resolution than the frequently used TBE buffer on our microchip electrophoresis system.
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11
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Wassarman KM. Native gel electrophoresis to study the binding and release of RNA polymerase by 6S RNA. Methods Mol Biol 2012; 905:259-271. [PMID: 22736010 DOI: 10.1007/978-1-61779-949-5_17] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
RNA-protein interactions are critical in diverse aspects of gene expression and often serve to mediate regulatory events. Many procedures are available to gain information about RNA-protein interactions. They span from initial identification of an interaction, such as through co-immunoprecipitation studies, to highly detailed atomic resolution definition of the interaction gained from crystallographic and NMR studies. One of the most versatile techniques uses native gel electrophoresis to study RNA-protein complexes, which is often called band shift, gel retardation, or electrophoretic mobility shift assays. Gel shift assays have been used to study a plethora of RNA-protein interactions in all organisms, but here we will use the 6S RNA:RNA polymerase interaction from Escherichia coli as an example to direct discussion of questions that can be addressed, including the ability to follow the dynamics of complexes over time.
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Affiliation(s)
- Karen M Wassarman
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI, USA.
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12
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Transgenic mice with overexpression of mutated human optineurin(E50K) in the retina. Mol Biol Rep 2011; 39:1119-24. [DOI: 10.1007/s11033-011-0840-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2010] [Accepted: 05/05/2011] [Indexed: 10/18/2022]
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13
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MAPREC assay for quantitation of mutants in a recombinant flavivirus vaccine strain using near-infrared fluorescent dyes. J Virol Methods 2011; 175:14-9. [PMID: 21514323 DOI: 10.1016/j.jviromet.2011.04.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2010] [Revised: 03/28/2011] [Accepted: 04/07/2011] [Indexed: 12/14/2022]
Abstract
Mutant analysis by PCR and restriction enzyme cleavage (MAPREC) is a quantitative assay of revertants in batches of live viral vaccines. The assay is highly sensitive and reliable but requires radioactive isotopes, which complicates its use in quality control laboratories. To quantify mutants in the cDNA of the West Nile (WN)/Dengue 4 chimera that was proposed as a new candidate of live vaccine against West Nile disease, alternative MAPREC protocols using non-radioactive dyes were explored. To compare the utility of different fluorescent dyes for MAPREC, the G(2337)→C mutation that was revealed by microarray hybridization in WN/Dengue 4 chimera virus was used as a model. DNA fragments produced by restriction endonuclease digestion were visualized in polyacrylamide gels by visible-range fluorescent dyes including ethidium bromide (EtBr) and SYBR Green I as well as by near-infrared (NIR) dye SYTO 60 and NIR dyes 700 and 800. The MAPREC assay performed with SYTO 60 and SYBR Green I was more sensitive than with EtBr but less sensitive than with NIR dyes 700 or 800. The NIR dyes 700 and 800 exhibited a wide linear range that may enable the detection of 0.05% of mutants in viral stocks. The NIR-based MAPREC assay was validated by using World Health Organization (WHO) international references for poliovirus type 3 with known contents of mutants. Values of mutant content produced by the non-radioactive assay were similar to the values determined in a previous WHO international collaborative study. The modified MAPREC assay could be used as an alternative to the radioisotope-based standard protocol for quality control of live viral vaccines.
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14
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Lefever M, Kosmeder JW, Farrell M, Bieniarz C. Microwave-mediated synthesis of labeled nucleotides with utility in the synthesis of DNA probes. Bioconjug Chem 2011; 21:1773-8. [PMID: 20812713 DOI: 10.1021/bc100013b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A novel method of linking haptens to deoxycytidine 5'-triphosphate via microwave-mediated bisulfate-catalyzed transamination with hydrazine has been developed. This method enables the tethering of small molecule haptens to dCTP via a discrete polyethylene glycol (PEG) spacer, yielding N(4)-aminodeoxycytidine 5'-triphosphate-dPEG-haptens. This synthetic approach employs microwave-catalyzed hydrazinolysis that enables the attachment of spacers via hydrazine linkages. The microwave-mediated introduction of this hydrazine handle provides a significant improvement in yield over those of published thermal methods. The microwave reaction was shown to be scalable, and the final product was amenable to labeling with a wide variety of haptens. The resulting nucleotide triphosphates, N(4)-aminodeoxycytidine 5'-triphosphate-dPEG-haptens, can serve as unique substrates for the enzyme-mediated labeling of DNA probes. The efficacy of incorporation of one such novel nucleotide, N(4)-aminodeoxycytidine 5'-triphosphate-dPEG(4)-DNP, has been demonstrated in nick translation labeling of HER2 and HPV probes. The labeled probes have been shown to be effective in visualizing their target genes in tissue.
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Affiliation(s)
- Mark Lefever
- Ventana Medical Systems, Inc., Tucson, Arizona 85755, USA
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15
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Schnitzler BE, Thebo PL, Tomley FM, Uggla A, Shirley MW. PCR identification of chicken Eimeria: A simplified read-out. Avian Pathol 2010; 28:89-93. [PMID: 16147553 DOI: 10.1080/03079459995091] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
A polymerase chain reaction (PCR) assay, based on the amplification of internal transcribed spacer 1 (ITS1) regions of ribosomal DNA, was developed for the chicken coccidian species Eimeria maxima, E. mitis and E. praecox. Thus, taking into account our previous work, a complete set of ITS1-based, species-specific primers for the detection and discrimination of all seven Eimeria species that infect the domestic fowl is now available. ITS1 primers for each of these seven species of Eimeria were also used as capture probes in a paper chromatography assay (PACHA). The addition of PACHA to the PCR assay provided a faster, more simplified read-out compared to staining of amplified bands in an agarose gel with ethidium bromide.
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Affiliation(s)
- B E Schnitzler
- Department of Parasitology, Swedish University of Agricultural Sciences & National Veterinary Institute, Uppsala, Sweden.
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16
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Soo PC, Horng YT, Chang KC, Wang JY, Hsueh PR, Chuang CY, Lu CC, Lai HC. A simple gold nanoparticle probes assay for identification of Mycobacterium tuberculosis and Mycobacterium tuberculosis complex from clinical specimens. Mol Cell Probes 2009; 23:240-6. [DOI: 10.1016/j.mcp.2009.04.006] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2009] [Revised: 04/28/2009] [Accepted: 04/30/2009] [Indexed: 10/20/2022]
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17
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18
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Fu R, Li T, Park HG. An ultrasensitive DNAzyme-based colorimetric strategy for nucleic acid detection. Chem Commun (Camb) 2009:5838-40. [DOI: 10.1039/b907762f] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Xi D, Luo X, Lu Q, Yao K, Liu Z, Ning Q. The detection of HBV DNA with gold-coated iron oxide nanoparticle gene probes. JOURNAL OF NANOPARTICLE RESEARCH : AN INTERDISCIPLINARY FORUM FOR NANOSCALE SCIENCE AND TECHNOLOGY 2008; 10:393-400. [PMID: 32214883 PMCID: PMC7088703 DOI: 10.1007/s11051-007-9263-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2006] [Accepted: 06/09/2007] [Indexed: 05/20/2023]
Abstract
Gold-coated iron oxide nanoparticle Hepatitis B virus (HBV) DNA probes were prepared, and their application for HBV DNA measurement was studied. Gold-coated iron oxide nanoparticles were prepared by the citrate reduction of tetra-chloroauric acid in the presence of iron oxide nanoparticles which were added as seeds. With a fluorescence-based method, the maximal surface coverage of hexaethiol 30-mer oligonucleotides and the maximal percentage of hybridization strands on gold-coated iron oxide nanoparticles were (120 ± 8) oligonucleotides per nanoparticle, and (14 ± 2%), respectively, which were comparable with those of (132 ± 10) and (22 ± 3%) in Au nanoparticle groups. Large network aggregates were formed when gold-coated iron oxide nanoparticle HBV DNA gene probe was applied to detect HBV DNA molecules as evidenced by transmission electron microscopy and the high specificity was verified by blot hybridization. Our results further suggested that detecting DNA with iron oxide nanoparticles and magnetic separator was feasible and might be an alternative effective method.
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Affiliation(s)
- Dong Xi
- Laboratory of Infectious Immunology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei P.R. China
| | - XiaoPing Luo
- Department of Pediatrics, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 P.R. China
| | - QiangHua Lu
- Department of Physics, Huazhong University of Science and Technology, Wuhan, 430030 Hubei P.R. China
| | - KaiLun Yao
- Department of Physics, Huazhong University of Science and Technology, Wuhan, 430030 Hubei P.R. China
| | - ZuLi Liu
- Department of Physics, Huazhong University of Science and Technology, Wuhan, 430030 Hubei P.R. China
| | - Qin Ning
- Laboratory of Infectious Immunology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei P.R. China
- Department of Infectious Disease, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiefang Avenue, Wuhan, 430030 Hubei P.R. China
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20
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Ståhl PL, Gantelius J, Natanaelsson C, Ahmadian A, Andersson-Svahn H, Lundeberg J. Visual DNA - Identification of DNA sequence variations by bead trapping. Genomics 2007; 90:741-5. [DOI: 10.1016/j.ygeno.2007.07.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2007] [Revised: 07/12/2007] [Accepted: 07/25/2007] [Indexed: 11/25/2022]
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21
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Using a Microcantilever Array for Detecting Phase Transitions and Stability of DNA. Clin Lab Med 2007; 27:163-71. [DOI: 10.1016/j.cll.2006.12.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Biswal SL, Raorane D, Chaiken A, Birecki H, Majumdar A. Nanomechanical Detection of DNA Melting on Microcantilever Surfaces. Anal Chem 2006; 78:7104-9. [PMID: 17037909 DOI: 10.1021/ac052171y] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We observe surface stress changes in response to thermal dehybridization, or melting, of double-stranded DNA (dsDNA) oligonucleotides that are grafted on one side of a microcantilever beam. Changes in surface stress occur when one complementary DNA strand melts and diffuses away from the other, resulting in alterations of the electrostatic, counterionic, and hydration interaction forces between the remaining neighboring surface-grafted DNA molecules. We have been able to distinguish changes in the melting temperature of dsDNA as a function of salt concentration and oligomer length. This technique also highlights differences between surface immobilized and solution DNA melting dynamics, which allows us to better understand the stability of DNA on surfaces. The transduction of phase transitions into a mechanical signal is ubiquitous for DNA, making cantilever-based detection a widely useful and complementary alternative to calorimetric and fluorescence measurements.
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Affiliation(s)
- Sibani Lisa Biswal
- Department of Mechanical Engineering, UC Berkeley, Berkeley, California 94720, USA
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Liu CH, Li ZP, Du BA, Duan XR, Wang YC. Silver Nanoparticle-Based Ultrasensitive Chemiluminescent Detection of DNA Hybridization and Single-Nucleotide Polymorphisms. Anal Chem 2006; 78:3738-44. [PMID: 16737231 DOI: 10.1021/ac0522409] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new nanoparticle-based chemiluminescent (CL) method has been developed for the ultrasensitive detection of DNA hybridization. The assay relies on a sandwich-type DNA hybridization in which the DNA targets are first hybridized to the captured oligonucleotide probes immobilized on polystyrene microwells and then the silver nanoparticles modified with alkylthiol-capped oligonucleotides are used as probes to monitor the presence of the specific target DNA. After being anchored on the hybrids, silver nanoparticles are dissolved to Ag+ in HNO3 solution and sensitively determined by a coupling CL reaction system (Ag+-Mn2+-K2S2O8-H3PO4-luminol). The combination of the remarkable sensitivity of the CL method with the large number of Ag+ released from each hybrid allows the detection of specific sequence DNA targets at levels as low as 5 fM. The sensitivity increases 6 orders of magnitude greater than that of the gold nanoparticle-based colorimetric method and is comparable to that of surface-enhanced Raman spectroscopy, which is one of the most sensitive detection approaches available to the nanoparticle-based detection for DNA hybridization. Moreover, the perfectly complementary DNA targets and the single-base mismatched DNA strands can be evidently differentiated through controlling the temperature, which indicates that the proposed CL assay offers great promise for single-nucleotide polymorphism analysis.
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Affiliation(s)
- Cheng-Hui Liu
- College of Chemistry and Environment Science, Hebei University, Baoding 071002, China
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24
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Kang J, Lee MS, Watowich SJ, Gorenstein DG. Chemiluminescence-based electrophoretic mobility shift assay of RNA-protein interactions: application to binding of viral capsid proteins to RNA. J Virol Methods 2005; 131:155-9. [PMID: 16182384 DOI: 10.1016/j.jviromet.2005.08.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2005] [Accepted: 08/18/2005] [Indexed: 10/25/2022]
Abstract
A chemiluminescence electrophoretic mobility shift assay was introduced for the study of RNA-protein interactions that include association of genomic RNA and viral capsid proteins. Binding of the capsid protein of Venezuelan equine encephalitis virus (VEEV) to several types of RNA was used as a model system to test the application of the method. The effects of RNA secondary structures and the significance of electrostatic interaction on binding were identified. This method may have wide application to the study of RNA-protein interactions.
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Affiliation(s)
- Jonghoon Kang
- Sealy Center for Structural Biology and Department of Human Biological Chemistry and Genetics, The University of Texas Medical Branch, Galveston, TX 77555, USA
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25
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Cukier P, Bachega TASS, Mendonça BB, Billerbeck AEC. Use of nonradioactive labeling to detect large gene rearrangements in 21-hydroxylase deficiency. ACTA ACUST UNITED AC 2005; 59:369-74. [PMID: 15654491 DOI: 10.1590/s0041-87812004000600010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
PURPOSE To establish the Southern blotting technique using hybridization with a nonradioactive probe to detect large rearrangements of CYP21A2 in a Brazilian cohort with congenital adrenal hyperplasia due to 21-hydroxylase deficiency (CAH-21OH). METHOD We studied 42 patients, 2 of them related, comprising 80 non-related alleles. DNA samples were obtained from peripheral blood, digested by restriction enzyme Taq I, submitted to Southern blotting and hybridized with biotin-labeled probes. RESULTS This method was shown to be reliable with results similar to the radioactive-labeling method. We found CYP21A2 deletion (2.5%), large gene conversion (8.8%), CYP21AP deletion (3.8%), and CYP21A1P duplication (6.3%). These frequencies were similar to those found in our previous study in which a large number of cases were studied. Good hybridization patterns were achieved with a smaller amount of DNA (5 mug), and fragment signs were observed after 5 minutes to 1 hour of exposure. CONCLUSIONS We established a non-radioactive (biotin) Southern blot/hybridization methodology for CYP21A2 large rearrangements with good results. Despite being more arduous, this technique is faster, requires a smaller amount of DNA, and most importantly, avoids problems with the use of radioactivity.
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Affiliation(s)
- Priscilla Cukier
- Discipline od Endocrinology, Hospital das Clínicas, Faculty of Medicine, University of São Paulo, São Paulo, SP, Brazil
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26
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MOTSON GRAHAMR, FLEMING JEANS, BROOKER SALLY. POTENTIAL APPLICATIONS FOR THE USE OF LANTHANIDE COMPLEXES AS LUMINESCENT BIOLABELS. ADVANCES IN INORGANIC CHEMISTRY 2004. [DOI: 10.1016/s0898-8838(03)55007-3] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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27
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Fluorescent microscopic determination of proteins in human serum with the self-ordered ring of nuclear fast red formed on the solid support of glass slides. Talanta 2003; 59:681-9. [DOI: 10.1016/s0039-9140(02)00579-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2002] [Revised: 11/04/2002] [Accepted: 11/04/2002] [Indexed: 11/23/2022]
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28
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Wang Y, Yang J, Wu X, Li L, Sun S, Su B, Zhao Z. Progress of Spectral Probes for Nucleic Acids. ANAL LETT 2003. [DOI: 10.1081/al-120023702] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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29
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30
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Antolı́n A, González I, Garcı́a T, Hernández PE, Martı́n R. Arcobacter spp. enumeration in poultry meat using a combined PCR-ELISA assay. Meat Sci 2001; 59:169-74. [DOI: 10.1016/s0309-1740(01)00067-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2000] [Revised: 02/01/2001] [Accepted: 02/14/2001] [Indexed: 11/25/2022]
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31
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Kostenko E, Dobrikov M, Komarova N, Pyshniy D, Vlassov V, Zenkova M. 5'-bis-pyrenylated oligonucleotides display enhanced excimer fluorescence upon hybridization with DNA and RNA. NUCLEOSIDES, NUCLEOTIDES & NUCLEIC ACIDS 2001; 20:1859-70. [PMID: 11719999 DOI: 10.1081/ncn-100107197] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
A simple one-step procedure was applied for synthesis of oligonucleotide conjugates bearing two pyrene residues at the 5'-phosphate of oligonucleotide. Excimer fluorescence intensity of the conjugates is highly sensitive to duplex formation: binding of the bis-pyrenylated oligonucleotides to their DNA and RNA targets leads 10-fold increase of fluorescence. The data show that excimer fluorescence intensity of the conjugates depends linearly on the concentration of target DNA and permits quantification of DNA in solution.
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Affiliation(s)
- E Kostenko
- Novosibirsk Institute of Bioorganic Chemistry, Russia
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32
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Kostenko E, Dobrikov M, Pyshnyi D, Petyuk V, Komarova N, Vlassov V, Zenkova M. 5'-bis-pyrenylated oligonucleotides displaying excimer fluorescence provide sensitive probes of RNA sequence and structure. Nucleic Acids Res 2001; 29:3611-20. [PMID: 11522831 PMCID: PMC55892 DOI: 10.1093/nar/29.17.3611] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2001] [Revised: 07/17/2001] [Accepted: 07/17/2001] [Indexed: 11/12/2022] Open
Abstract
Oligonucleotide conjugates bearing two pyrene residues attached to 5'-phosphate through a phosphoramide bond were synthesised. Fluorescence spectra of the conjugates show a peak typical of monomer emission (lambda(max) 382 nm) and a broad emission peak with lambda(max )476 nm, which indicates the excimer formation between the two pyrene residues. Conjugation of these two pyrene residues to the 5'-phosphate of oligonucleotides does not affect the stabilities of heteroduplexes formed by conjugates with the corresponding linear strands. A monomer fluorescence of the conjugates is considerably affected by the heteroduplex formation allowing the conjugates to be used as fluorescent hybridisation probes. The 5'-bis-pyrenylated oligonucleotides have been successfully used for investigation of affinity and kinetics of antisense oligonucleotides binding to the multidrug resistance gene 1 (PGY1/MDR1) mRNA. The changes of excimer fluorescence of the conjugates occurring during hybridisation depended on the structure of the binding sites: hybridisation to heavily structured parts of RNA resulted in quenching of the excimer fluorescence, while binding to RNA regions with a loose secondary structure was accompanied by an enhancement of the excimer fluorescence. Potentially, these conjugates may be considered as fluorescent probes for RNA structure investigation.
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Affiliation(s)
- E Kostenko
- Novosibirsk Institute of Bioorganic Chemistry, Lavrentiev Avenue 8, Novosibirsk 630090, Russia
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33
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Brown LJ, May JP, Brown T. Synthesis of a modified thymidine monomer for site-specific incorporation of reporter groups into oligonucleotides. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00224-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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34
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O'Dell SD, Chen X, Day IN. Higher resolution microplate array diagonal gel electrophoresis: application to a multiallelic minisatellite. Hum Mutat 2000; 15:565-76. [PMID: 10862086 DOI: 10.1002/1098-1004(200006)15:6<565::aid-humu8>3.0.co;2-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The 5' polymorphic region of the insulin (INS, MIM# 176730) gene contains a variable tandem repetition of 14-15 bp (a variable number of tandem repeats (VNTR) locus). After PCR amplification, we achieved precise sizing of class I alleles (range 641 to 843 bp) on 96-well open-face polyacrylamide microplate array diagonal gel electrophoresis (MADGE) gels, obtaining resolution of the 2% mobility difference which represents one tandem repeat. PCR products were run double-stranded, but no additional bands were generated except in the case of differences of three, two, and one repeat between alleles; none compromised allele identification, and in the latter case the heteroduplex was a useful confirmation signal. No end labelling of primers was required, as the sensitive Vistra Green intercalating dye for double strands was used for visualization of bands from diluted samples. Duracryl, a high mechanical-strength polyacrylamide derivative, proved to have good resolution properties for electrophoresis. A co-run ladder ensured precise binning without inter-lane variability. Simultaneous electrophoresis of gels in a thermostatically controlled tank allowed up to 1,000 samples to be run in 90 min. Gels were analyzed using a FluorImager 595 fluorescent scanning system, and alleles identified using a combination of Phoretix software for band migration measurement and Microsoft Excel to compute allele sizes. Unlike other systems for minisatellite allele sizing, throughput was not limited (in time or cost) by electrophoresis.
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Affiliation(s)
- S D O'Dell
- Human Genetics Research Division, Southampton University School of Medicine, Southampton General Hospital, Southampton, United Kingdom. S.D.O'
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35
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Tenner KS, O'Kane DJ. Clinical application of Southern blot hybridization with chemiluminescence detection. Methods Enzymol 2000; 305:450-66. [PMID: 10812619 DOI: 10.1016/s0076-6879(00)05506-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- K S Tenner
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota 55905, USA
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36
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Ostroff RM, Hopkins D, Haeberli AB, Baouchi W, Polisky B. Thin Film Biosensor for Rapid Visual Detection of Nucleic Acid Targets. Clin Chem 1999. [DOI: 10.1093/clinchem/45.9.1659] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Background: We have developed a silicon-based biosensor that generates a visual signal in response to nucleic acid targets.
Methods: In this system, capture oligonucleotide probes are immobilized on the surface of the biosensor. Interaction of the capture probes with a complementary target and a biotinylated detector oligonucleotide allows initiation of formation of an organic thin film on the biosensor. Thin film formation is completed by enzymatic activity of peroxidase conjugated to an anti-biotin antibody. Peroxidase catalyzes deposition of an insoluble product onto the silicon surface, generating a uniform thin film. The increased thickness on the surface alters the perceived color of the biosensor through changes in the interference patterns of reflected light from the surface, causing a color change from gold to purple.
Results: The biosensor results may be evaluated by direct visual inspection or quantified by ellipsometry. Results are obtained in 25 min with a detection limit of 5 pmol/L (150 amol/sample). Selectivity of the biosensor is demonstrated by discrimination of single nucleotide mismatches. Multitarget arrays are also analyzed with the thin film biosensor, and the system is capable of detecting targets from human serum and urine.
Conclusions: The biosensor surface is inexpensive to produce, and the assay format is simple and rapid. The thin film biosensor is adaptable to a wide variety of nucleic acid detection applications, including rapid diagnostic testing for infectious disease panels, antibiotic resistance panels, or allelic discrimination of specific genetic markers.
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37
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Ji L, Fang B, Roth JA. A rapid, sensitive, and nonradioactive method for assay of FHIT Ap3A hydrolase activity by fluorescence thin-layer chromatographic image analysis. Anal Biochem 1999; 271:114-6. [PMID: 10361018 DOI: 10.1006/abio.1999.4131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- L Ji
- Department of Thoracic and Cardiovascular Surgery, University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, Texas 77030, USA.
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38
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González I, García T, Fernández A, Sanz B, Hernández PE, Martín R. Rapid enumeration of Escherichia coli in oysters by a quantitative PCR-ELISA. J Appl Microbiol 1999; 86:231-6. [PMID: 10063622 DOI: 10.1046/j.1365-2672.1999.00659.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Direct enumeration of Escherichia coli from oysters was achieved using a polymerase chain reaction (PCR) amplification of the lamB gene coupled with an enzyme-linked immunosorbent assay (ELISA). Amplified PCR products generated using a digoxigenin-labelled primer were heat denatured before being quantified by an ELISA. A biotinylated probe immobilized onto streptavidin-coated microplates was used to capture the digoxigenin-labelled fragments that were detected with a peroxidase antidigoxigenin conjugate. Subsequent enzymic conversion of substrate gave distinct absorbance differences when assaying oyster samples containing E. coli in the range 10-10(5) cfu g-1.
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Affiliation(s)
- I González
- Departamento de Nutrición y Bromatologia III, Facultad de Veterinaria, Universidad Complutense, Madrid, Spain.
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39
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A chemiluminescence derivatization method for detecting nucleic acids and DNA probes using a trimethoxyphenylglyoxal reagent that recognizes guanine. Anal Chim Acta 1999. [DOI: 10.1016/s0003-2670(98)00724-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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40
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Storhoff JJ, Elghanian R, Mucic RC, Mirkin CA, Letsinger RL. One-Pot Colorimetric Differentiation of Polynucleotides with Single Base Imperfections Using Gold Nanoparticle Probes. J Am Chem Soc 1998. [DOI: 10.1021/ja972332i] [Citation(s) in RCA: 1914] [Impact Index Per Article: 73.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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41
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Alba FJ, Daban JR. Nonenzymatic chemiluminescent detection and quantitation of total protein on Western and slot blots allowing subsequent immunodetection and sequencing. Electrophoresis 1997; 18:1960-6. [PMID: 9420153 DOI: 10.1002/elps.1150181114] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We have studied the light emission efficiency of proteins labeled with different fluorescent dyes chemically excited by the bis(2,4,6-trichlorophenyl)oxalate (TCPO)-H2O2 reaction. Using this peroxyoxalate chemiluminescence system, the best results were obtained with proteins covalently labeled with 2-methoxy-2,4-diphenyl-3(2H)-furanone (MDPF). Blotted proteins on polyvinylidene difluoride (PVDF) membranes can be labeled rapidly with MDPF. Our results demonstrate that energy from the excited intermediate produced in the TCPO-H2O2 reaction can be efficiently transferred to MDPF-labeled proteins in solution and on PVDF membranes. Although this nonenzymatic chemiluminescent system produces a background emission that reduces the sensitivity, the method developed in this work allows detection of 5 ng of protein in blots after 5 min exposure to X-ray film. Chemiluminescence of MDPF-labeled proteins on Western and slot blots may also be detected and quantified using a charge-coupled device (CCD) camera or a storage phosphor imaging system. This chemiluminescent method allows the staining of the total electrophoretic pattern but does not preclude further N-terminal sequencing and immunodetection of specific bands.
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Affiliation(s)
- F J Alba
- Department de Bioquímica i Biologia Molecular, Facultat de Cièncias, Universitat Autònoma de Barcelona, Bellaterra, Spain
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42
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Elghanian R, Storhoff JJ, Mucic RC, Letsinger RL, Mirkin CA. Selective colorimetric detection of polynucleotides based on the distance-dependent optical properties of gold nanoparticles. Science 1997; 277:1078-81. [PMID: 9262471 DOI: 10.1126/science.277.5329.1078] [Citation(s) in RCA: 2765] [Impact Index Per Article: 102.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A highly selective, colorimetric polynucleotide detection method based on mercaptoalkyloligonucleotide-modified gold nanoparticle probes is reported. Introduction of a single-stranded target oligonucleotide (30 bases) into a solution containing the appropriate probes resulted in the formation of a polymeric network of nanoparticles with a concomitant red-to-pinkish/purple color change. Hybridization was facilitated by freezing and thawing of the solutions, and the denaturation of these hybrid materials showed transition temperatures over a narrow range that allowed differentiation of a variety of imperfect targets. Transfer of the hybridization mixture to a reverse-phase silica plate resulted in a blue color upon drying that could be detected visually. The unoptimized system can detect about 10 femtomoles of an oligonucleotide.
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Affiliation(s)
- R Elghanian
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA
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43
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Burczak JD, Wilkinson FE, Robbins DJ. Impact of genomics on diagnostic medicine. Drug Dev Res 1997. [DOI: 10.1002/(sici)1098-2299(199707/08)41:3/4<193::aid-ddr9>3.0.co;2-g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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