Bu araştırma Küresel Sağlık Girişimi Grand Zorluklar ile Bill &amp; Melinda Gates Vakfı hibe ile finanse edildi.

<ol>
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The authors declare they have no competing financial interests.

İstendiğinde MATLAB algoritması kullanarak anlamlı ölçüm verileri elde etmek için, kullanıcı uygun giriş değerlerini seçmeniz gerekir. Bölüm 5 ve 6 her komut başlatılması sonra, tüm giriş değişkenleri otomatik olarak komut penceresinde İstenen ve çıkışlar otomatik olarak oluşturulur. Bölüm 5.7 kullanıcı bir yamaç eşiğini seçmesi istenir. yamaç eşik değeri uyum korelasyon katsayısı (r 2) karesini etkiler. Bir termal döngü ihraç ham floresan verileri kullanırken, 2.0...

Kantitatif nükleik asit amplifikasyon çevre, gıda kaynaklı ve su patojenlere tespiti için hem de klinik teşhis için önemli bir tekniktir. Gerçek zamanlı nicel polimeraz zincir reaksiyonu (qPCR), HİV-1 virüs yük testi, bakteriyel patojenlerin saptanması, ve bir çok diğer organizmalar 1 taranması için, örneğin nükleik asitlerin, duyarlı, spesifik, ve nicel tespiti için altın standart yöntemdir - 3. Gerçek zamanlı qPCR sırasında primerler döngülerinde patojen DNA&#39;yı çoğaltmak ve bir flüoresan sinyal her bir döngüde numunede büyütülmüş DNA miktarı ile orantılı olduğundan oluşturulur. Patojen DNA&#39;ya ait, bilinmeyen bir konsantrasyonunu ihtiva eden bir numune standart örneklerinin ilk DNA konsantrasyonuna ve flüoresan sinyal belirli bir eşiğe ulaştığı zaman (yani, çevrim eşiği, veya C, T) ile ilgilidir, bir standart eğri kullanılarak ölçülebilir. <p class=Gerçek zamanlı qPCR bu rekombinaz polimeraz amplifikasyonu (ECP) olarak sonuçlar, alternatif izotermal amplifikasyon teknikleri almak için pahalı termal döngü cihaz ve birkaç saat gerektirirken, çünkü &quot;jove_content&quot;&gt; 4 geliştirilmiştir. Bu platformlar genellikle daha hızlı sonuç sağlar ve daha az pahalı, basit ekipmanla gerçekleştirilebilir bir alt, bir sıcaklık, bir nükleik asitleri amplifiye. Nokta-bakım uygulamaları için özellikle çekici dakika içinde DNA güçlendirir RPA, düşük büyütme sıcaklığı (37 ° C) gerektirir, ve kirliliklerin 5,6 varlığında aktif kalır. 12 - RPA tahlilleri biothreat maddeler 7&#39;nin gıda maddesi analizi, patojenin tespit edilmesi, kanser ilaç tarama ve saptama da dahil olmak üzere, geniş bir uygulama yelpazesi için geliştirilmiştir. Bununla birlikte, nükleik asitlerin ölçümü için RPA kullanımı 13,14 sınırlıdır. Bir önceki çalışmada, bu sho olduwn gerçek-zamanlı kantitatif RPA (qRPA) 15 mümkündür. Burada daha ayrıntılı bir protokol bir standart eğri, QPCR kullanılarak miktar tayini için benzer bir yöntemi kullanarak bilinmeyen örnekleri ölçmek için gerçek zamanlı kantitatif RPA ile sağlanır. Bu protokol düzgün çalışıp sistemi sağlamak için bir iç pozitif kontrol (IPC) geliştirmek için nasıl yanı sıra, bir proof-of-concept olarak, HIV-1 DNA tespiti için termal döngü bir RPA reaksiyonu gerçekleştirmek açıklamaktadır. Eğitim verileri kullanarak standart bir eğri oluşturmak için bir termal döngü veya mikroskop ve veri analizi kullanılarak veri toplama da ayrıntılı. Son olarak, özel bir komut dosyası ile standart eğri kullanılarak bilinmeyen örnekleri ölçülmesi için bir yöntem gösterilmiştir. Bu qRPA tekniği bilinmeyen konsantrasyonları ile numunelerin miktarının sağlayan ve geleneksel gerçek zamanlı qPCR üzerinden pek çok avantajı vardır.

<table border="0" cellpadding="0" cellspacing="0" width="1426">
	<tbody>
		<tr height="20">
			<td height="20" style="height:20px;width:443px;">qRPA Assay</td>
			<td style="width:199px;"></td>
			<td style="width:195px;"></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Supply</td>
			<td>Vendor</td>
			<td>Part number</td>
			<td style="width:589px;">Comments/Description</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">HIV-1 forward primer</td>
			<td>Integrated DNA Technologies</td>
			<td>custom DNA oligos</td>
			<td style="width:589px;">5&#8217;-TGG CAG TAT TCA TTC ACA ATT TTA AAA GAA AAG G-3&#8217;&#160;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">HIV-1 reverse primer</td>
			<td>Integrated DNA Technologies</td>
			<td>custom DNA oligos</td>
			<td style="width:589px;">5&#8217;-CCC GAA AAT TTT GAA TTT TTG TAA TTT GTT TTT G-3&#8217;&#160;</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">HIV-1 probe</td>
			<td>BioSearch Technologies&#160;</td>
			<td>custom DNA oligos</td>
			<td style="width:589px;">5&#8217;- TGC TAT TAT GTC TAC TAT TCT TTC CCC [SIMA/HEX] GC [THF] C [dT-BHQ1] GTA CCC CCC AAT CCC C -3&#8217;&#160;</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">IPC probe</td>
			<td>BioSearch Technologies&#160;</td>
			<td>custom DNA oligos</td>
			<td style="width:589px;">5&#8217;-AGG TAG TGA CAA GAA ATA ACA ATA CAG GAC [FAM] T [THF] T [dT-BHQ1] GGT TTT GTA ATT GGA A -3&#8217;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">RPA exo reagents (pellets, rehydration buffer, magnesium acetate</td>
			<td>TwistDx</td>
			<td>TwistAmp exo</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">PCR tube strips</td>
			<td>BioRad</td>
			<td>TLS0801</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">PCR flat cap tube strips</td>
			<td>BioRad</td>
			<td>TCS0803</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Micro-seal adhesive</td>
			<td>BioRad</td>
			<td>558/MJ&#160;</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;">HIV-1 target (pHIV-IRES- eYFP&#916;Env&#916;Vif&#916;Vpr)</td>
			<td></td>
			<td></td>
			<td style="width:589px;">custom plasmid, see: Segall, H. I., Yoo, E. &#38; Sutton, R. E. Characterization and detection of artificial replication-competent lentivirus of altered host range. Molecular Therapy 8, 118&#8211;129, doi:10.1016/S1525-0016(03)00134-5 (2003).</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Human male genomic DNA</td>
			<td>Applied Biosystems</td>
			<td>360486</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">96 well cold-block</td>
			<td>Cole Parmer</td>
			<td>EW-36700-48</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Thermal cycler</td>
			<td>BioRad</td>
			<td>CFX96</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">MiniFuge</td>
			<td>VWR</td>
			<td>93000-196</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Vortex</td>
			<td>VWR</td>
			<td>58816-121</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Tris buffer 1.0 M, pH 8.0</td>
			<td>EMD Millipore</td>
			<td>648314</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">EDTA 0.5 M, pH 8.0</td>
			<td>Promega</td>
			<td>V4321</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Nuclease free water</td>
			<td>Ambion</td>
			<td>AM9937</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;"></td>
			<td></td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">IPC Development</td>
			<td></td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Supply</td>
			<td>Vendor</td>
			<td>Part number</td>
			<td style="width:589px;">Comments/Description</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;">Cryptosporidium parvum IPC template</td>
			<td>Waterborne Inc</td>
			<td>P102C</td>
			<td style="width:589px;">It is also possible to order a double stranded synthetic target from IDT if the user is unequipped to work with C. parvum (a BSL-2 infectious agent). PCR and RPA primers for C. parvum were designed using GenBank accession number AF115377.1</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">PCR long forward primer</td>
			<td>Integrated DNA Technologies</td>
			<td>custom DNA oligos</td>
			<td>5&#8217;-TGG CAG TAT TCA TTC ACA ATT TTA AAA GAA AAG G/ ATC TAA GGA AGG CAG CAG GC-3&#8217;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">PCR long reverse primer</td>
			<td>Integrated DNA Technologies</td>
			<td>custom DNA oligos</td>
			<td>5&#8217;- CCC GAA AAT TTT GAA TTT TTG TAA TTT GTT TTT G/ TGC TGG AGT ATT CAA GGC ATA -3&#8217;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Phusion High-Fidelty DNA Polymerase</td>
			<td>New England Biolabs</td>
			<td>M0530S</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Qiaquick Gel Extraction Kit</td>
			<td>Qiagen</td>
			<td>28704</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">TAE 10X buffer</td>
			<td>EMD Millipore</td>
			<td>574797</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Agarose</td>
			<td>Sigma Aldrich</td>
			<td>A9539</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;"></td>
			<td></td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Microscope Experiments</td>
			<td></td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Supply</td>
			<td>Vendor</td>
			<td>Part number</td>
			<td style="width:589px;">Comments/Description</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Upright fluorescence microscope</td>
			<td>Zeiss</td>
			<td>Zeiss Imager.J1</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Stage heater</td>
			<td>Bioscience Tools</td>
			<td>TC-GSH</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">1-Channel Precision High Stability Temperature Controller</td>
			<td>Bioscience Tools</td>
			<td>TC-1100S</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">FAM/GFP filter cube</td>
			<td>Zeiss</td>
			<td>filter set 38 (000000-1031-346)</td>
			<td style="width:589px;">excitation BP 470/40 nm, emission BP 520/50 nm</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">HEX filter cube</td>
			<td>Chroma</td>
			<td>49014</td>
			<td style="width:589px;">excitation BP 530/30 nm, emission BP 575/40 nm</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Laser cutter</td>
			<td>Engraver&#39;s Network</td>
			<td>VLS3.60</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">1/8&#34; black acrylic</td>
			<td>McMaster Carr</td>
			<td>8505K113</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">1.5 mm clear acrylic</td>
			<td>McMaster Carr</td>
			<td>PD-72268940&#160;</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Super glue</td>
			<td>Office Depot</td>
			<td>Duro super glue&#160;</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">PCR grade mineral oil</td>
			<td>Sigma Aldrich</td>
			<td>M8662-5VL</td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;"></td>
			<td></td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Data Analysis</td>
			<td></td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Software</td>
			<td>Vendor</td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Microsoft Excel</td>
			<td>Microsoft</td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">MATLAB</td>
			<td>MATLAB</td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">MATLAB script: &#34;JoVE_qRPA_standard_curve.m&#8221;</td>
			<td>Included in SI</td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">MATLAB script: &#34;JoVE_qRPA_validation_and_quantification.m&#8221;</td>
			<td>Included in SI</td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">MATLAB script: &#34;JoVE_real_time_intensity_to_excel.m&#8221;</td>
			<td>Included in SI</td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Adobe Illustrator</td>
			<td>Adobe</td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">JoVE_qRPA_well.ai</td>
			<td>Included in SI</td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">JoVE_qRPA_base.ai</td>
			<td>Included in SI</td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">AxioVision software</td>
			<td>Zeiss</td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">JoVE_AxioVision_Script.ziscript</td>
			<td>Included in SI</td>
			<td></td>
			<td style="width:589px;"></td>
		</tr>
	</tbody>
</table>

development of a quantitative recombinase polymerase amplification assay with an internal positive control

It was recently demonstrated that recombinase polymerase amplification (RPA), an isothermal amplification platform for pathogen detection, may be used to quantify DNA sample concentration using a standard curve. In this manuscript, a detailed protocol for developing and implementing a real-time quantitative recombinase polymerase amplification assay (qRPA assay) is provided. Using HIV-1 DNA quantification as an example, the assembly of real-time RPA reactions, the design of an internal positive control (IPC) sequence, and co-amplification of the IPC and target of interest are all described. Instructions and data processing scripts for the construction of a standard curve using data from multiple experiments are provided, which may be used to predict the concentration of unknown samples or assess the performance of the assay. Finally, an alternative method for collecting real-time fluorescence data with a microscope and a stage heater as a step towards developing a point-of-care qRPA assay is described. The protocol and scripts provided may be used for the development of a qRPA assay for any DNA target of interest.

Hedefle qRPA deneylerde IPC olarak hizmet etmek üzere bir dizi seçmeden önce (HIV-1), DNA, dahili pozitif kontrol (IPC) adayları yukarıda anlatıldığı ve HIV-1 DNA mevcut olmadan qRPA reaksiyonlarda amplifiye etme kabiliyetleri açısından tarandı. IPC aday hedef (HİV-1) üzerinden rekabet eden HIV-1 amplikon oluşumunu IPC oluşumunu önlemek için, DNA daha uzundur. Şekil 2A, iki C nesil gösterildiği gibi Parvum IPC aday jel elektroforezi kullanılarak 415 ve 435 bp&#39...

Watch this Scientific Journal Video about Development of a Quantitative Recombinase Polymerase Amplification Assay with an Internal Positive Control at JoVE.com

Development of a Quantitative Recombinase Polymerase Amplification Assay with an Internal Positive Control

Provided is a protocol for developing a real-time recombinase polymerase amplification assay to quantify initial concentration of DNA samples using either a thermal cycler or a microscope and stage heater. Also described is the development of an internal positive control. Scripts are provided for processing raw real-time fluorescence data.

İç Pozitif Kontrol ile Kantitatif Recombinase Polimeraz Amplifikasyon Testi Geliştirme

It was recently demonstrated that recombinase polymerase amplification (RPA), an isothermal amplification platform for pathogen detection, may be used to ...

development-quantitative-recombinase-polymerase-amplification-assay

Research

JoVE Journal

Biology

13.4K Görüntüleme.  Rice University. Provided is a protocol for developing a real-time recombinase polymerase amplification assay to quantify initial concentration of DNA samples using either a thermal cycler or a microscope and stage heater. Also described is the development of an internal positive control. Scripts are provided for processing raw real-time fluorescence data.