Name: highly efficient ligation of small rna molecules for microrna quantitation by high-throughput sequencing
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Description: Watch this Scientific Journal Video about Highly Efficient Ligation of Small RNA Molecules for MicroRNA Quantitation by High-Throughput Sequencing at JoVE.com

The authors would like to thank members of the Yi laboratory especially Zhaojie Zhang for fruitful discussions regarding linker design and ligation efficiencies, as well as the American Cancer Society for supporting this work through a postdoctoral fellowship (#125209) to J.E.L. Research reported in this publication was also supported by the National Institute of Arthritis and Musculoskeletal and Skin Diseases of the National Institutes of Health under Award Number R01AR059697 (to R.Y.) and a research grant from the Linda Crnic Institute for Down Syndrome. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

注:关键是要在整个过程中保持无RNA酶的条件。 1.腺苷酸化的3&#39;连接器<ol><li>稀释设计用于3&#39;连接反应至100μM在不含核酸酶的H 2 O的DNA寡核苷酸 注:该寡核苷酸应具有一个5&#39;磷酸基团，将在5随机化的核苷酸&#39;末端和3&#39;dideoxycytosine。 5&#39;磷酸基团是第M个酶的高效5的规定&#39;腺苷酸化10。磷酸盐可以通过预处理寡核苷酸的添加与多核苷酸激酶，或排序，直接修改。随机核苷酸在5&#39;端是用于最小化序列偏好其中的RNA连接酶表现出对于其他6某些端到端连接的反应很重要。在3的寡核苷酸吨端&#39;dideoxycytosine在3放置一个阻挡元件"ø抑制的接头-连接体多联体在随后的连接步骤的形成和还用于阻止连接反应11 3&#39;形成于3的端部与miRNA -接头分子的端部"。选择用于无偏的miR-SEQ方法的寡核苷酸接头序列如下:5&#39;PO 4 NNTGGAATTCTCGGGTGCCAAGG-dideoxyC3&#39;。 </li><li>组装下面腺苷酸化反应:200pmol的3&#39;接头寡核苷酸，4微升10×5&#39;腺苷酸化的DNA缓冲液，4μl1mM的ATP，4μl的第M个 RNA连接酶，核酸酶游离H 2 O至40微升的最终体积。 </li><li>孵育在65℃下反应1小时。终止反应，加热至85℃5分钟。 </li><li>通过加入2.5倍体积的100％乙醇和1/3体积的10M乙酸铵沉淀腺苷酸化的连接体，以除去残留的ATP，并防止在将来的反应未预料到的连接反应。 <ol><li>简单地说，混合人cohol，盐，并在4℃下进行20分钟的寡核苷酸溶液至均匀，以全速在微量离心纺丝（〜15000×g离心）。洗70％的乙醇，空气干燥，悬浮颗粒在核酸游离H 2 O的适当体积，以产生50-100微米寡腺苷酸化的。 </li></ol></li><li>通过运行在18％聚丙烯酰胺凝胶确认腺苷酸化。 <ol><li>通过混合制备凝胶下面一起6.3克尿素，6.75毫升40％的丙烯酰胺，和1.5毫升10×TBE。加入H 2 O操作15毫升。 </li><li>混合直到尿素完全溶解，并添加150μl的10％（重量/体积）过硫酸铵（APS）和15微升tetramethlyethylenediamine（TEMED）。 </li><li>一旦凝胶已设定，预运行30分钟，在凝胶宽度的24伏/厘米用1×TBE缓冲液在室温下。一旦30分钟可达冲洗井用电泳缓冲液。 </li><li>拌5皮摩尔腺苷酸化寡核苷酸与和的2倍变性的RNA上样缓冲液等体积​​（95％（体积/体积）甲酰胺，0.02％（重量/体积）SDS，0.02％溴酚蓝（重量/体积），0.01％（重量/体积）二甲苯蓝，1.0mM的EDTA）中，热简要至75℃，并搭扣在冰上冷却。分配整个样品进入凝胶的孔中。还包括一个相同的量的非腺苷化控制的，以及低分子量大小标准。 </li><li>运行该凝胶在24伏/厘米，直到溴酚蓝的方式向凝胶的底部¾。以在1×TBE缓冲液1×SYBR -金溶液拆卸装置，后染色凝胶和可视化的紫外透射仪箱（ 图2）。 注:凝胶纯化寡腺苷酸化在类似于上面描述的，如果"没有输入的RNA"控件都导致高的量的PCR产物的方式相比，与输入的RNA样品。 </li></ol></li></ol> 2.连接器结扎到的miRNA的3&#39;末端<ol><li> 3&#39;结扎<ol><li>装配在冰上下列组分按所列顺序:1.0微升50％（重量/体积）的PEG 8000，0.5＆＃956;微升10x RNA连接酶缓冲液（500毫摩尔的Tris-HCl pH为7.5，100毫摩尔的MgCl 2，10毫摩尔DTT），1.0微升腺苷酸化的3&#39;连接器（100μM），0.5μl的RNase抑制剂，0.5-8.0微克总RNA， 0.5微升T4 RNA连接酶2，无核酸酶的H 2 O操作的5微升的最终体积。 </li><li>混合通过移液反应的溶液太粘稠，旋涡，由于高浓度的PEG 8000。一旦彻底混合，将用加热盖在热循环仪中进行反应。设置块℃至16℃，并保温4小时。 注:该反应可以按比例增加至20微升的最终体积，而不在连接效率的任何损失。反应4小时，在环境温度下过夜或在4℃下，以产生基本上相同的连接效率。 </li></ol></li><li>凝胶净化<ol><li>继3&#39;结扎，拌上2×RNA上样缓冲液等体积​​反应。热至70℃5分钟，将其卡在冰上冷却。 </li&gt; <li>运行用于PAGE纯化15％聚丙烯酰胺凝胶中的样品。 <ol><li>制备含有7M尿素的15％聚丙烯酰胺凝胶，在类似于步骤1.5先前描述的方式。 </li><li>运行前的凝胶在凝胶宽度的24伏/厘米至少30分钟。关闭电源，冲洗水井，负载样品和凝胶运行在相同的电压预运行。 </li><li>装载样品和运行页面，直至溴酚蓝刚退出凝胶。所需产物将迁移靠近二甲苯蓝。 </li></ol></li></ol></li><li>染色，可视化，并切除<ol><li>在干净的托盘1X电泳缓冲液（TBE），1X SYBR金，和摇滚15分钟拆卸胶设备和场所凝胶。 </li><li>从染色皿中取出凝胶和可视化的紫外透射盒子盖上干净的保鲜膜。连接产物应该是大约45个核苷酸长度。 </li><li>切下含有连接产物的区域用一块干净的razo- [R刀片和地点在0.5ml微离心管中。 </li></ol></li><li>产品分离和降水<ol><li> 0.5 ml离心管刺穿底部与地下30针，然后将穿孔的管中的第二清洁，低滞留，1.5 ml离心管。离心5分钟，在〜15,000×克。 </li><li>目视确认该整个凝胶切片已经通过在所述内管的孔移动。如果有必要，用干净的枪头一些凝胶碎片距离拉得更近了洞。 </li><li>弃去空0.5毫升管中，加入400μl的高盐柱缓冲液（HSCB 400 mM氯化钠，的25mM的Tris-HCl pH为7.5，0.1％SDS）中的丙烯酰胺的浆液。岩管（多个）在4℃下过夜。 </li><li>使用宽孔移液管尖端传送浆料到0.22微米醋酸纤维素离心柱上。离心3分钟，在室温下以〜15000×g离心，收集所有的液体远离丙烯酰胺凝胶基质。 </li><li>液体转移到一个干净的，低保留，1.5毫升试管中含有荷兰国际集团1微升20mg / ml的糖原。添加异丙醇等体积的1/10体积乙酸钠。通过倒转试管几次混合溶液和沉淀在-80℃下冷冻20分钟。 </li><li>离心机以全速在4℃下进行20分钟以沉淀核酸。除去上清，洗涤在70％乙醇中。空气干燥沉淀物，在室温下10分钟，并直接进行5&#39;连接步骤。 </li></ol></li></ol> 3.连接器连接以5&#39;端的miRNA的3&#39;混合连接器<ol><li>以沉淀核酸，添加以下组分:2微升PEG 8000（50％重量/体积），0.5微升10×RNA连接酶缓冲液，0.5微升ATP（10毫摩尔），0.5微升NN-RNA的寡核苷酸（100μM）和H 2 O 4微升的最终体积。 注:"NN-RNA的寡核苷酸"的组合物是如下5&#39;-倒置脱氧TCUACAGUCCGACGAUCNN3&#39;和由生产经HPLC进行纯化。 </li><li>混此示例吹打上下反复。这样做一段时间（最长5分钟），以确保颗粒被完全重新溶解。如果再溶解是有问题的，加热样品简短（3-5分钟）至37℃，并继续移液混合。 </li><li>一旦粒料是早在溶液中，并将内容物转移到含有1微升1干净的PCR管中:RNA酶抑制剂和T4 RNA连接酶1（5个单位）的1:1混合物。通过上下吹打再次混合。 </li><li>孵育在热循环仪中，反应在37℃下搅拌4小时。立即进行cDNA合成。 </li></ol> 4.反转录/ cDNA合成<ol><li>将以下组件添加到5&#39;连接反应:2微升5×RT缓冲液，0.75微升100mM的DTT，1微升Illumina公司的RT引物5&#39;-GCCTTGGCACCCGAGAATTCCA-3&#39;（1μM），和0.5微升的dNTPs（10毫摩尔）。 </li><li>通过移液和热拌至65℃5分钟。然后慢慢冷却在板凳吨同前。 </li><li>一旦反应冷却至室温，放置​​管在冰上并添加每个逆转录酶和RNA酶抑制剂0.5微升。通过移液并将其放置在用于制造商的指示所指示的延伸步骤的热循环仪中混合。 </li><li>一旦完成添加5微升不含核酸酶的H 2澳带来的cDNA文库的最终体积达到15微升。 </li></ol> 5.图书馆准备<ol><li>为索引的PCR，装配在冰上下列反应:6微升5倍的Phusion缓冲液，1微升的dNTPs（10毫摩尔），0.9微升的DMSO，0.75μl的5&#39;引物（25μM），0.75μl的3&#39;引物（25μM）， 3微升cDNA文库（取决于输入的量可变浓度），加入0.5μlPhusion聚合酶（1单位），无核酸酶的H 2 O操作的30微升的最终体积。选择的引物序列，以确保与模板和测序平台的兼容性的选择。 <ol><li>运行，使用以下设置将PCR反应:在98℃预变性3分钟，在第4个周期，变性98℃15秒，退火50℃15秒，72℃延伸15秒。 注:根据所输入的材料的量，改变总的PCR循环数。典型地，对于1-2微克总RNA的一个输入端，13个总PCR循环足以产生所述的miR-SEQ库。 </li><li>进行随后的周期中， 例如，循环5-12中，在退火和延伸循环相结合，并在70℃下30秒和变性的两步方式是再次98℃持续15秒。 注:反应体积为30微升，以允许暂停PCR程序，并删除一个10微升等分试样在预先确定的周期数来监视外观所需产物。通常情况下，循环10，13，和16被选择，用于从总RNA样品的测试。 </li></ol></li><li>准备通过混合2毫升40％的丙烯酰胺，加入1ml的10×TBE，和H 2 O至10ml 8％非变性聚丙烯酰胺凝胶。然后加入100微升10％APS和10微升TEMED的。倒入凝胶，让集。 <ol><li>运行前的凝胶在凝胶宽度的12伏/厘米30分钟。同花顺井。加入1微升10×加样缓冲液（15％聚蔗糖-400，66毫摩尔EDTA，20毫摩尔的Tris-HCl pH 8.0的，0.1％（重量/体积）SDS，0.01％（重量/体积）溴酚兰）中，添加10微升的样品尺寸的各孔5毫米×1毫米×15毫米。典型地，每个孔可以加载多达30微升的样品。运行示例凝胶在凝胶宽度在1×TBE缓冲液中10伏/厘米，直至溴酚蓝染料刚刚跑出了凝胶的底部。 </li><li>染色，如在步骤2.3中所述可视化凝胶。 </li><li>消费税的146碱基对带和洗脱过夜0.25毫升HSCB在类似于在2.4节中描述的一种时尚。在异丙醇中的等体积的1/10体积乙酸钠使DNA沉淀。洗涤沉淀在70％Ethanol并悬浮在TE缓冲液。 </li><li>使用的PicoGreen根据制造商的建议进行量化的库。 </li></ol></li></ol>

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The authors declare no competing financial interests.

本文所描述的方法利用了几个关键变量最大化连接效率，即高浓度的PEG，用随机接头的，与高浓度的接头2,6,9的。这种方法可以从总RNA样品2可靠的定量测序文库。我们所进行的输入的RNA多步滴定，并得出结论认为，前面的方法是最适合的总RNA的量在1-8微克的范围（数据未显示）。当在10-500纳克范围的量使用，大部分的读取空间由适配器多联体，并从其中所述RNA连接酶被纯化细菌序...

高通量测序基础的方法已被广泛应用到许多生物样品近年来大大扩大我们的生物系统3,4的分子复杂性的理解。然而，制备RNA样品进行高通量测序的常赋予固有的就业方法的具体偏差，限制了这些强大的技术的潜在效用。这些具体的方法偏差得到了很好的证明了结扎为主，小RNA库准备1,2,5,6。这些偏见导致1000倍的变化读取号码等摩尔合成的miRNA，使得miRNA的丰推断，从测序数据疯狂可变且容易出错。 研究着重于噬菌体衍生的T4 RNA连接酶的性质已经证明，酶表现出的基于核苷酸的偏好7，它体现在高通量测序实验作为偏置库<sUP&gt; 1,2,8。为了最小化被RNA连接酶所赋予的偏见，多种策略已经使用;大分子拥挤9中 ，随机化是近端结扎部位6的适配器上的碱基序列，以及使用高浓度的结扎适配器2。通过这三种方法的组合，我们开发了一个工作流的小RNA文库的高通量测序（ 图1）兼容的无偏制剂。对于目前的协议和我们的优化方法进行直接的比较，请参阅最近的一份报告2。这种优化的方法产生的大于95％的在两个3&#39;和5&#39;步骤结扎的效率，并允许小分子RNA合成和生物样品2的无偏结扎。

<table><tbody><tr><td>3&#039; Linker (5&#039; phosphorylated, 3&#039; blocked)</td><td>Integrated DNA Technologies</td><td>custom</td><td></td></tr><tr><td>5&#039; Linker</td><td>Integrated DNA Technologies</td><td>custom</td><td>5&#039; blocked, HPLC purified</td></tr><tr><td>T4RNL2 (1-249 K227Q)</td><td>New England Biolabs</td><td>M0351S</td><td>Specialized for ligation of pre-adenylated DNA adapters</td></tr><tr><td>10x Ligation buffer (without ATP)</td><td>New England Biolabs</td><td>Included with M0351S</td><td></td></tr><tr><td>10x Ligation buffer (with ATP)</td><td>New England Biolabs</td><td>Included with M0204L</td><td></td></tr><tr><td>RNaseOUT</td><td>Invitrogen</td><td>10777-019</td><td></td></tr><tr><td>Polyethylene glycol (mol. Wt. 8,000)</td><td>New England Biolabs</td><td>Included with M0204L</td><td></td></tr><tr><td>Nuclease-free water</td><td>Ambion</td><td>AM9937</td><td>We have found water collected from a distillation apparatus to be of equvalent quality.</td></tr><tr><td>T4RNL1</td><td>New England Biolabs</td><td>M0204L</td><td></td></tr><tr><td>Superscript III RT kit</td><td>Invitrogen</td><td>18080-051&amp;nbsp;</td><td></td></tr><tr><td>Phusion PCR kit</td><td>New England Biolabs</td><td>M0530S</td><td></td></tr><tr><td>Illumina RP1 primer</td><td>Integrated DNA Technologies</td><td>custom</td><td>Sequence information available from Illumina</td></tr><tr><td>Illumina RT primer</td><td>Integrated DNA Technologies</td><td>custom</td><td>Sequence information available from Illumina</td></tr><tr><td>Illumina index primer(s)</td><td>Integrated DNA Technologies</td><td>custom</td><td>Sequence information available from Illumina</td></tr><tr><td>40% Acrylamide</td><td>Fisher Scientific</td><td>BP14081</td><td></td></tr><tr><td>Urea</td><td>Sigma Aldrich</td><td>U6504</td><td></td></tr><tr><td>Ammonium persulfate</td><td>Sigma Aldrich</td><td>A3678</td><td></td></tr><tr><td>Tetramethyethylenediamine (TEMED)</td><td>Sigma Aldrich</td><td>T9281</td><td></td></tr><tr><td>2x Denaturing RNA loading buffer</td><td>New England Biolabs</td><td>Included with M0351S</td><td></td></tr><tr><td>Razor blades</td><td>VWR</td><td>55411-050</td><td></td></tr><tr><td>SpinX Centricon tubes</td><td>Costar</td><td>CLS8161</td><td></td></tr><tr><td>Low retention microfuge tubes</td><td>Fisher Scientific</td><td>02-681-320</td><td></td></tr><tr><td>Sybr Gold</td><td>Invitrogen</td><td>S-11494</td><td></td></tr><tr><td>Adenylation kit</td><td>New England Biolabs</td><td>E2610L</td><td></td></tr></tbody></table>

highly efficient ligation of small rna molecules for microrna quantitation by high-throughput sequencing

miRNA的克隆和高通量测序，所谓的miR-SEQ，独树一帜的全基因组范围的方法来量化的miRNA与单核苷酸分辨率。这种技术捕获的miRNAs通过连接3&#39;和5&#39;寡核苷酸衔接头到miRNA分子，并允许从头 miRNA的发现。具有强大的新一代测序平台的耦合中，miR-SEQ一直在miRNA的生物学研究。然而，寡核苷酸连接的步骤介绍显著的偏见阻碍的miR-SEQ被用作一个精确的定量工具。以往的研究表明，在当前的miR-SEQ方法的偏见往往会导致不准确的miRNA定量与错误的高达1000倍的某些miRNA的1,2。要解决这些偏见，通过RNA结扎传授，我们已经开发出一种小RNA结扎方法导致95％以上的为3&#39;和5&#39;连接步骤连接效率。这个基准测试IM证明文库构建方法，使用等摩尔或差分混合的合成的miRNA，始终如一地产生具有与预期值小于2倍的偏差读出的数字。此外，这种高效率的miR-SEQ方法允许从体内总RNA样品2精确的全基因组miRNA表达谱。

预期的结果为前述方法最初应观测的DNA寡核苷酸，这是受腺苷酰化通过第M个 RNA连接酶（ 图2）的尺寸的单核苷酸移位（增加）的。下面的3&#39;连接，将丙烯酰胺凝胶的可视化表示（ 见图3）尖锐的高分子量条带在凝胶中的100-300核苷酸区域明显。这表明，总RNA样品使用是高品质（未劣化）。其次应该看到一个非常明亮的信号凝胶，这是多余的25个核苷酸区域，未连接...

Watch this Scientific Journal Video about Highly Efficient Ligation of Small RNA Molecules for MicroRNA Quantitation by High-Throughput Sequencing at JoVE.com

Highly Efficient Ligation of Small RNA Molecules for MicroRNA Quantitation by High-Throughput Sequencing

MicroRNAs (miRNAs) are a widely conserved class of regulatory molecules. Here we describe a miRNA cloning method that relies upon two potent ligation steps followed by high-throughput sequencing. Our method permits accurate genome-wide quantitation of miRNAs.

小RNA分子的高效结扎的微小RNA定量高通量测序

MiRNA cloning and high-throughput sequencing, termed miR-Seq, stands alone as a transcriptome-wide approach to quantify miRNAs with single nucleotide ...

highly-efficient-ligation-small-rna-molecules-for-microrna

Research

JoVE Journal

Biology

11.8K 次观看.  University of Colorado, Boulder. MicroRNAs (miRNAs) are a widely conserved class of regulatory molecules. Here we describe a miRNA cloning method that relies upon two potent ligation steps followed by high-throughput sequencing. Our method permits accurate genome-wide quantitation of miRNAs. 

视频: Highly Efficient Ligation of Small RNA Molecules for MicroRNA Quantitation by High-Throughput Sequencing

High Throughput MicroRNA Profiling: Optimized Multiplex qRT-PCR at Nanoliter Scale on the Fluidigm Dynamic ArrayTM IFCs

The broad involvement of miRNAs in critical processes underlying development, tissue homoeostasis and disease has led to a surging interest among the research and pharmaceutical communities. To study miRNAs, it is essential that the quantification of microRNA levels is accurate and robust. By comparing wild-type to small RNA deficient mouse embryonic stem cells (mESC), we revealed a lack of accuracy and robustness in previous published multiplex qRT-PCR techniques. Here, we describe an optimized method, including purifying away excessive primers from previous multiplex steps before singleplex real time detection, which dramatically increases the accuracy and robustness of the technique. Furthermore, we explain how performing the technique on a microfluidic chip at nanoliter volumes significantly reduces reagent costs and permits time effective high throughput miRNA expression profiling.

Here we describe an optimized multiplex reverse transcriptase quantitative PCR (qRT-PCR) protocol in combination with a microfluidic platform as a cost and time effective high-throughput screening tool for microRNA (miRNA) expression levels, especially when working with limited amounts of sample.

高通量微RNA分析：优化复纳升秤定量RT - PCR Fluidig​​m公司动态ArrayTM国际金融中心

The broad involvement of miRNAs in critical processes underlying development, tissue homoeostasis and disease has led to a surging interest among the ...

科研

生物工程

A Complete Pipeline for Isolating and Sequencing MicroRNAs, and Analyzing Them Using Open Source Tools

Half of all human transcripts are thought to be regulated by microRNAs. Therefore, quantifying microRNA expression can reveal underlying mechanisms in disease states and provide therapeutic targets and biomarkers. Here, we detail how to accurately quantify microRNAs. Briefly, this method describes isolating microRNAs, ligating them to adaptors suitable for high-throughput sequencing, amplifying the final products, and preparing a sample library. Then, we explain how to align the obtained sequencing reads to microRNA hairpins, and quantify, normalize, and calculate their differential expression. Versatile and robust, this combined experimental workflow and bioinformatic analysis enables users to begin with tissue extraction and finish with microRNA quantification.

Here, we describe a step-by-step strategy for isolating small RNAs, enriching for microRNAs, and preparing samples for high-throughput sequencing. We then describe how to process sequence reads and align them to microRNAs, using open source tools.

用于隔离和测序微RNA并使用开源工具分析微RNA的完整管道

Half of all human transcripts are thought to be regulated by microRNAs. Therefore, quantifying microRNA expression can reveal underlying mechanisms in ...

遗传学

Improving Small RNA-seq: Less Bias and Better Detection of 2'-O-Methyl RNAs

The study of small RNAs (sRNAs) by next-generation sequencing (NGS) is challenged by bias issues during library preparation. Several types of sRNA such as plant microRNAs (miRNAs) carry a 2&#39;-O-methyl (2&#39;-OMe) modification at their 3&#39;&#160;terminal nucleotide. This modification adds another difficulty as it inhibits 3&#39;&#160;adapter ligation. We previously demonstrated that modified versions of the &#39;TruSeq (TS)&#39;&#160;protocol have less bias and an improved detection of 2&#39;-OMe RNAs. Here we describe in detail protocol &#39;TS5&#39;, which showed the best overall performance. TS5 can be followed either using homemade reagents or reagents from the TS kit, with equal performance.

We present a detailed small RNA library reparation protocol with less bias than standard methods and an increased sensitivity for 2&#39;-O-methyl RNAs. This protocol can be followed using homemade reagents to save cost or using kits for convenience.

改进小RNA-seq:减少偏差，更好地检测2'-O-甲基RNA

The study of small RNAs (sRNAs) by next-generation sequencing (NGS) is challenged by bias issues during library preparation. Several types of sRNA such as ...

Identification of RNAs Engaged in Direct RNA-RNA Interaction with a Long Non-Coding RNA

The growing role attributed nowadays to long non-coding RNAs (lncRNA) in physiology and pathophysiology makes it crucial to characterize their interactome by identifying their molecular partners, DNA, proteins and/or RNAs. The latter can interact with lncRNA through networks involving proteins, but they can also be engaged in direct RNA/RNA interactions. We, therefore, developed an easy-to-use RNA pull-down procedure that allowed identification of RNAs engaged in direct RNA/RNA interaction with a lncRNA using psoralen, a molecule that cross-links only RNA/RNA interactions. Bioinformatics modeling of the lncRNA secondary structure allowed the selection of several specific antisense DNA oligonucleotide probes with a strong affinity for regions displaying a low probability of internal base pairing. Since the specific probes that were designed targeted accessible regions throughout the length of the lncRNA, the RNA-interaction zones could be delineated in the sequence of the lncRNA. When coupled with a high throughput RNA sequencing, this protocol can be used for the whole direct RNA interactome studies of a lncRNA of interest.

<meta charset="utf8"></head><body>鉴定与长链非编码 RNA 直接 RNA-RNA 相互作用的 RNA

An easy-to-use RNA pull-down protocol is designed for the identification of RNAs engaged in direct RNA/RNA interaction with a long non-coding RNA. The protocol uses psoralen as a fixative to cross-link only RNA/RNA interactions and provides the whole direct RNA interactome of a long non-coding RNA when coupled with RNA sequencing.

鉴定与长链非编码 RNA 直接 RNA-RNA 相互作用的 RNA

The growing role attributed nowadays to long non-coding RNAs (lncRNA) in physiology and pathophysiology makes it crucial to characterize their interactome ...

RNA Blot Analysis for the Detection and Quantification of Plant MicroRNAs

MicroRNAs (miRNAs) are a class of endogenously expressed non-coding, ~21 nt small RNAs involved in the regulation of gene expression in both plants and animals. Most miRNAs act as negative switches of gene expression targeting key genes. In plants, primary miRNAs (pri-miRNAs) transcripts are generated by RNA polymerase II, and they form varying lengths of stable stem-loop structures called pre-miRNAs. An endonuclease, Dicer-like1, processes the pre-miRNAs into miRNA-miRNA* duplexes. One of the strands from miRNA-miRNA* duplex is selected and loaded onto Argonaute 1 protein or its homologs to mediate the cleavage of target mRNAs. Although miRNAs are key signaling molecules, their detection is often carried out by less than optimal PCR-based methods instead of a sensitive northern blot analysis. We describe a simple, reliable, and extremely sensitive northern method that is ideal for the quantification of miRNA levels with very high sensitivity, literally from any plant tissue. Additionally, this method can be used to confirm the size, stability and the abundance of miRNAs and their precursors.

This method demonstrates use of the northern hybridization technique to detect miRNAs from total RNA extract.

用于植物微RNA检测和定量的RNA斑点分析

MicroRNAs (miRNAs) are a class of endogenously expressed non-coding, ~21 nt small RNAs involved in the regulation of gene expression in both plants and ...

生物化学

使用 AQRNA-seq 分析 tRNA 动力学

AQRNA-seq for Quantifying Small RNAs

AQRNA-seq provides a direct linear relationship between sequencing read counts and small RNA copy numbers in a biological sample, thus enabling accurate quantification of the pool of small RNAs. The AQRNA-seq library preparation procedure described here involves the use of custom-designed sequencing linkers and a step for reducing methylation RNA modifications that block reverse transcription processivity, which results in an increased yield of full-length cDNAs. In addition, a detailed implementation of the accompanying bioinformatics pipeline is presented. This demonstration of AQRNA-seq was conducted through a quantitative analysis of the 45 tRNAs in Mycobacterium bovis BCG harvested on 5 selected days across a 20-day time course of nutrient deprivation and 6 days of resuscitation. Ongoing efforts to improve the efficiency and rigor of AQRNA-seq will also be discussed here. This includes exploring methods to obviate gel purification for mitigating primer dimer issues after PCR amplification and to increase the proportion of full-length reads to enable more accurate read mapping. Future enhancements to AQRNA-seq will be focused on facilitating automation and high-throughput implementation of this technology for quantifying all small RNA species in cell and tissue samples from diverse organisms.

作者聚焦:AQRNA-seq 在绘制小 RNA 和解开蛋白质翻译机制中的作用

Absolute quantification RNA sequencing (AQRNA-seq) is a technology developed to quantify the landscape of all small RNAs in biological mixtures. Here, both the library preparation and data processing steps of AQRNA-seq are demonstrated, quantifying changes in the transfer RNA (tRNA) pool in Mycobacterium bovis BCG during starvation-induced dormancy.

用于定量小 RNA 的 AQRNA-seq

AQRNA-seq provides a direct linear relationship between sequencing read counts and small RNA copy numbers in a biological sample, thus enabling accurate ...

A Rapid High-throughput Method for Mapping Ribonucleoproteins (RNPs) on Human pre-mRNA

Sequencing RNAs that co-immunoprecipitate (co-IP) with RNA binding proteins has increased our understanding of splicing by demonstrating that binding location often influences function of a splicing factor.  However, as with any sampling strategy the chance of identifying an RNA bound to a splicing factor is proportional to its cellular abundance.  We have developed a novel in vitro approach for surveying binding specificity on otherwise transient pre-mRNA. This approach utilizes a specifically designed oligonucleotide pool that tiles across introns, exons, splice junctions, or other pre-mRNA.  The pool is subjected to some kind of molecular selection. Here, we demonstrate the method by separating the oligonucleotide into a bound and unbound fraction and utilize a two color array strategy to record the enrichment of each oligonucleotide in the bound fraction. The array data generates high-resolution maps with the ability to identify sequence-specific and structural determinates of ribonucleoprotein (RNP) binding on pre-mRNA.  A unique advantage to this method is its ability to avoid the sampling bias towards mRNA associated with current IP and SELEX techniques, as the pool is specifically designed and synthesized from pre-mRNA sequence. The flexibility of the oligonucleotide pool is another advantage since the experimenter chooses which regions to study and tile across, tailoring the pool to their individual needs.  Using this technique, one can assay the effects of polymorphisms or mutations on binding on a large scale or clone the library into a functional splicing reporter and identify oligonucleotides that are enriched in the included fraction.  This novel in vitro high-resolution mapping scheme provides a unique way to study RNP interactions with transient pre-mRNA species, whose low abundance makes them difficult to study with current in vivo techniques.  



A Rapid High-throughput Method for Mapping Ribonucleoproteins RNPs on Human pre-mRNA

Due to the transient nature of pre-mRNA, it can be difficult to isolate and study in vivo. Here, we present a novel in vitro approach to investigate RNA-protein interactions using a synthetic oligo pool that tiles across selected regions of pre-mRNA.

一种快速高通量的方法映射核糖核蛋白（RNPs）人类的前体mRNA

Sequencing RNAs that co-immunoprecipitate (co-IP) with RNA binding proteins has increased our understanding of splicing by demonstrating that binding ...

小RNA分子的高效结扎的微小RNA定量高通量测序

摘要

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此视频中的章节

高通量微RNA分析：优化复纳升秤定量RT - PCR Fluidigm公司动态ArrayTM国际金融中心

用于隔离和测序微RNA并使用开源工具分析微RNA的完整管道

改进小RNA-seq:减少偏差，更好地检测2'-O-甲基RNA

鉴定与长链非编码 RNA 直接 RNA-RNA 相互作用的 RNA

鉴定与长链非编码 RNA 直接 RNA-RNA 相互作用的 RNA

用于植物微RNA检测和定量的RNA斑点分析

用于定量小 RNA 的 AQRNA-seq

用于定量小 RNA 的 AQRNA-seq

用于定量小 RNA 的 AQRNA-seq

一种快速高通量的方法映射核糖核蛋白（RNPs）人类的前体mRNA

小RNA分子的高效结扎的微小RNA定量高通量测序

摘要

探索更多视频

此视频中的章节

高通量微RNA分析：优化复纳升秤定量RT - PCR Fluidig​​m公司动态ArrayTM国际金融中心

用于隔离和测序微RNA并使用开源工具分析微RNA的完整管道

改进小RNA-seq:减少偏差，更好地检测2'-O-甲基RNA

鉴定与长链非编码 RNA 直接 RNA-RNA 相互作用的 RNA

鉴定与长链非编码 RNA 直接 RNA-RNA 相互作用的 RNA

用于植物微RNA检测和定量的RNA斑点分析

用于定量小 RNA 的 AQRNA-seq

用于定量小 RNA 的 AQRNA-seq

用于定量小 RNA 的 AQRNA-seq

一种快速高通量的方法映射核糖核蛋白（RNPs）人类的前体mRNA

高通量微RNA分析：优化复纳升秤定量RT - PCR Fluidigm公司动态ArrayTM国际金融中心