Name: chitosan/interfering rna nanoparticle mediated gene silencing in disease vector mosquito larvae
Uploaded: 2015-03-25T13:00:00.000+00:00
Duration: 8 min 36 s
Description: Watch this Scientific Journal Video about Chitosan/Interfering RNA Nanoparticle Mediated Gene Silencing in Disease Vector Mosquito Larvae at JoVE.com

Funding from the Kansas Agricultural Experiment Station and K-State Arthropod Genomics Center to KYZ supported the original development of chitosan/dsRNA-mediated gene silencing in A. gambiae19.The A. gambiae work described here was supported in part by R01-AI095842 from NIH/NIAID to KM. Development of chitosan/siRNA-mediated gene silencing in A. aegypti20,21 was supported by NIH/NIAID Award R01-AI081795 to MDS. The contents of this study are solely the responsibility of the authors and do not necessarily represent the official views of the NIH.

1.蚊种和饲养<ol><li>维持A.冈比亚 G3和A.伊蚊利物浦IB12菌株（在下面的代表性研究中使用），或者根据标准的实验室实践或如先前23,24描述的其它感兴趣的菌株。 </li></ol> 2.双链RNA和siRNA设计与制作<ol><li>设计引物来构造特定的感兴趣的基因长的dsRNA模板。使用E-的RNAi工具25。根据选择或作为该方法产生的dsRNA先前所述19。 <ol><li>对于阴性对照，合成的dsRNA 19对应于绿色荧光蛋白（GFP），β半乳糖苷酶（β-GAL）或一些不表达于蚊子其他基因的序列。如果需要的话，19的dsRNA用于生成摘要如下代表性的结果可被用作阳性对照。商店的dsRNA溶解在无RNA酶的水在-80℃下直到需要。 </li></ol></li><li>或者，根据标准实验室实践设计基因特异性siRNA或如前面10所描述。加扰击倒的siRNA的序列来设计阴性对照siRNA不对应于任何蚊基因。购买定制的siRNA，这些都可以通过一些信誉良好的供应商。 <ol><li>如果需要的话，siRNA的20,21用于获得下面总结了代表性的结果可被用作阳性对照。商店的siRNA溶解在无RNA酶的水在-80℃直到需要。 </li></ol></li></ol> 3.准备壳聚糖/干扰RNA纳米粒子<ol><li>收集预制备的RT 100mM的硫酸钠（100毫用Na 2 SO 4在去离子H 2 O）和0.1M乙酸钠（0.1M NAC 2 H 3 O 2 -0.1 1M乙酸，pH 4.5的去离子H 2 O）缓冲区。 </li><li>壳聚糖溶解（​​≥75％脱乙酰化）的0.1M乙酸钠缓冲液，使0.02％（重量/体积）的工作溶液，并在使用前保持该溶液在RT。 </li><li>溶解的dsRNA或siRNA在50μl去离子H 2 O和它添加到100mM的硫酸钠缓冲剂使32微克每100微升的50mM硫酸钠的dsRNA / siRNA的的100微升溶液中。 </li><li>加入100微升的脱乙酰壳多糖溶液，以所述dsRNA / siRNA的溶液中，然后加热的水浴中的混合物在55℃下1分钟。设置了控制通过加入100微升的50mM硫酸至100μl的脱乙酰壳多糖溶液的钠，并按照相同的程序。 </li><li>立即混合溶液30秒由高速涡流在RT以促进纳米粒子的形成。 </li><li>在13000×g离心离心混合物10分钟，在RT下，在这之后时间的颗粒应该是可见的。将上清液转移到一个新的1.5毫升管。用它来制备蚊子食前空气干燥沉淀在室温≈10分钟。 </li><li> M通过使用上清液从控制（见3.5）作为空白来计算的dsRNA / siRNA的那保留在上清液中的总量easure的dsRNA / siRNA对上清液中的浓度。使用的dsRNA / siRNA的的起始量和残留在上清液来计算的dsRNA / siRNA对截留在纳米颗粒的百分比的量之间的差。这装载效率通常在90％以上。 </li><li>如果需要更多的纳米粒子重复相同的过程。立即用干的纳米粒子。之前使用的颗粒冷库的影响尚未评估。 </li></ol> 4.准备蚊子食物含壳聚糖/干扰RNA纳米粒子<ol><li>制备1ml的2％的琼脂糖溶液（重量/体积）在去离子水中，熔化琼脂糖，并保持熔化的琼脂糖溶液在55℃的水浴后使用。 </li><li>混合鱼食品薄片（47％的​​粗蛋白，最小值粗脂肪10％，最大粗纤维3％）和干酵母在1（重量/重量）:2的比例。研磨该混合物以用研钵和研杵（及格通过50号美国标准试验筛）的小颗粒。使用地面食品，这应该是带褐色的颜色，或者立即或者在密封容器中储存于4℃几周。 </li><li>在1.5ml管中，混合6毫克地面食品与来自第3.7节用牙签将干燥的纳米颗粒。 </li><li>加入30微升2％的预熔化的琼脂糖凝胶溶液的食品的纳米粒子混合物;用牙签或枪头立即，充分搅拌。 </li><li>使用含有食品和纳米颗粒立即喂养蚊子幼虫的凝胶。可替换地，一旦将凝胶在室温下完全固化，储存于4℃的凝胶，并使用第二天，或在-80℃以备后用。 </li></ol> 5.饲养蚊子幼虫食含壳聚糖/干扰RNA纳米粒子<ol><li>喂养A.冈比亚蚊子幼虫: <ol><li>删除SI从1.5 ml管使用牙签切成使用干净的刀片或牙签6等于切片ngle凝胶颗粒。 </li><li>转让20第三龄幼虫到含有100毫升去离子水的500毫升的培养皿。 </li><li>加入每一天四天培养皿一次凝胶颗粒（切碎成小块）的一个切片喂蚊子幼虫。请务必遵守幼虫取食的颗粒，应在尺寸显著减少或第二天完全不存在。时间之后，蚊子就会发展成晚期第四龄幼虫。 </li><li>记录在实验过程中的任何明显的表型变化。审查的转录水平和其他表型的改变为在第6在四个天期间的结束讨论。 </li></ol></li><li>喂养A.伊蚊孑孓: <ol><li>切凝胶粒料成使用干净的刀片或牙签6等于切片。 </li><li>卵孵化后，科幻放置50岁同步24小时首先龄幼虫成≈40毫升去离子水的培养皿。 </li><li>饲料每培养皿中的幼虫一个片4小时/天，然后回到幼虫转移到正规的幼虫饮食的2:1地面鱼食片和干酵母一天的休息。每天在整个4龄幼虫重复上述步骤。 </li><li>检查转录水平和其他表型的改变，如第6，在预期的发育时间点讨论。 </li></ol></li></ol> 6.确认基因敲除的<ol><li> A.在通过定量RT-PCR相对定量成绩单伊蚊和A.冈比亚幼虫。 <ol><li>执行与如上所述11,19,20，或按照标准实验室程序在至少10汇总控制与实验幼虫分析定量RT-PCR测定具有三个生物学重复。代表性的结果包括在下面。 </li><li>对于特定的组织类型/身体部分（ 即 ，脑或天线），射孔的分析RM QRT-PCR如6.1.1以下解剖描述来恢复感兴趣的组织（例如，参见迈索尔等人 21）。 </li></ol></li><li>通过原位杂交确认击倒<ol><li>合成地高辛标记的反义，并根据标准的实验室实践或描述26感知控制的核糖核酸探针。 </li><li>执行在每豪根等人的 27协议原位杂交确认击倒如前所述11,20和在下面的代表性结果部分中讨论。 </li></ol></li><li>通过免疫组化确认击倒<ol><li>如果是可用的抗基因靶向的蛋白质产物，进行免疫组化分析，如前所述28，这有利于识别与击倒的表型分析20的最大水平的个体中例举的representati已经下文结果部分。 </li></ol></li></ol>

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E., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Evidence+of+RNAi+in+humans+from+systemically+administered+siRNA+via+targeted+nanoparticles.">Evidence of RNAi in humans from systemically administered siRNA via targeted nanoparticles.</a> Nature. 464 (7921), 1067-1070 (2010).</li><li>Molinaro, R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Polyethylenimine+and+chitosan+carriers+for+the+delivery+of+RNA+interference+effectors.">Polyethylenimine and chitosan carriers for the delivery of RNA interference effectors.</a> Expert opinion on drug delivery. 10 (12), 1653-1668 (2013).</li><li>Singha, K., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Polymers+in+small-interfering+RNA+delivery.">Polymers in small-interfering RNA delivery.</a> Nucleic acid therapeutics. 21 (3), 133-148 (2011).</li></ol>

The authors have nothing to disclose.

脱乙酰壳多糖/干扰RNA纳米颗粒本文所描述的方法已被用于在A中幼虫发育期间有效地针对基因冈比亚 （ 图2,3）和A.埃及伊蚊 （ 图4，5，6，表1，表2）。壳聚糖的纳米颗粒可以与任一长的dsRNA或siRNA，这两者已被成功地用于在蚊子就证明了这里所描述的代表性的结果来制备。 dsRNA的合成比购买的siRNA更便宜，但更耗费人力。如果脱乙酰壳多糖/ siRNA的被使?...

在按蚊和Aedine属血液喂养蚊子传播负责几个人类的祸害最严重的致病因子。据估计，3.4十亿人的风险感染疟疾，负责每年全球有超过一半万人死亡。从感染疟疾结果由疟原虫属寄生虫，这是通过按蚊属感染的蚊子，包括主要的非洲病媒冈比亚按蚊 （叮咬传播给人类<a href="http://www.who.int/topics/malaria/en/">http://www.who.int/topics/malaria/en/</a> ，2014）1。 埃及伊蚊是登革热病毒，导致登革热，一种非特异性发热性疾病是世界上最普遍和显著虫媒病毒病的主要蚊子。登革热病毒是目前为&gt; 2.5十亿人在热带地区的威胁，与每年inciden每年24000人死亡导致大约〜50000000案件CE（ <a href="http://www.cdc.gov/dengue/">http://www.cdc.gov/dengue/</a> ，2014）2。尽管蚊子传播的疾病，对人体健康的毁灭性的全球影响，预防和治疗这些疾病的有效手段缺乏。灭蚊是目前预防疾病的最佳方法。 用于控制通过媒介昆虫的遗传操作节肢动物传播的疾病的可能性已经认识超过四十年3。 A.转基因品系伊蚊设计有一个阻遏女性特有的飞型近期取得的潜力，利用转基因矢量控制策略成为现实4-6。这些进步都质疑研究人员确定了矢量控制和蚊子操纵基因功能的补充手段新的基因目标。基因表达ð维修uring发展，是女性飞蚊4的情况下，可能会促进新的矢量控制策略的阐释。但是，这主要是由于技术上的挑战，很少基因的功能已被鉴定A.发展过程中冈比亚，埃及伊蚊，或其他蚊种。 自从发现C.线虫 7，RNA干扰（RNAi），这是保守的动物，植物和微生物，已被广泛用于功能基因研究中的各种生物，包括昆虫8,9。 RNAi途径由Dicer酶，它劈开长​​双链RNA进入开始充当序列特异性RNA干扰短20-25个核苷酸长的siRNA。的siRNA沉默基因是在互补序列通过促 ​​进转录周转，裂解和翻译9的中断。长的dsRNA分子（通常为300-600碱基对）或定制的siRNA靶向particulař序列可用于在研究实验室用于沉默感兴趣的任何基因。当通过RNA干扰交付管理，研究人员可以控制时间，其中的基因沉默发起。因为它可以用来克服的挑战，如发育杀伤力或无菌，可阻碍生产和维护菌株轴承可遗传突变，一个昂贵的和劳动密集的过程，目前尚未在所有昆虫种类可用的这个优点是非常有用的。虽然基因沉默的RNA干扰的程度可以从基因而异基因，组织对组织和动物动物，RNAi技术被广泛地用于基因蚊子和其它昆虫8,9的功能分析。 三个干扰RNA递送策略已用于蚊子:显微注射，浸泡/局部施用，并摄取。进行了详细的历史和在昆虫中使用这三种技术中的比较，请参阅Yu 等人 8。 W¯¯E具有成功地使用显微注射10作为递送的siRNA的一种手段，以靶向A.发育基因伊蚊胚胎，幼虫，蛹和11-14。然而，这种劳动密集型的投放策略同时需要显微注射的设置和熟练的手。此外，显微注射是压力的生物体，一个混杂因素，特别是当行为表型进行评估。最后，显微注射递送不能扩展到田间进行矢量控制。作为替代，浸泡在干扰RNA溶液中的生物也成为一种流行的诱导基因沉默的手段，因为它是方便的，并且需要很少的设备或劳力。浸泡已经主要是在昆虫细胞系被应用研究8，但在最近的一项研究，在击倒A.达到伊蚊幼虫浸入dsRNA的15，其中动物似乎是摄取的溶液。然而，对于涉及多个experimenta的分析研究升组或表型，浸泡是相当昂贵的。洛佩兹-马丁内斯等人 16描述补液驱动的RNAi，一种新的方法来干扰RNA交付，涉及脱水生理盐水补液和用含有RNA干扰一滴水。这种方法并切断与整个动物浸没相关的成本，但是比注射更昂贵，并且可以将其应用到可容忍高渗透压物种的限制。此外，它是很难设想如何浸没或脱水/再水化浸渍方法可适于在磁场矢量控制。由于这些原因，用于后胚胎的研究，递送干扰RNA与摄入食物是一种可行的替代策略。 虽然摄入为基础的战略并不适用于所有的昆虫种类，也许最值得注意的是果蝇 ，口服给药干扰RNA与食物混合促进基因SIlencing在各种昆虫8,17，包括A.伊蚊成年人18。我们在A.描述壳聚糖纳米介导的RNA干扰冈比亚幼虫19，并已成功地应用这种方法为A.降低基因表达伊蚊幼虫20,21。这里，方法为这个RNAi的过程，这涉及截留通过聚合物壳聚糖干扰RNA的，是详尽。脱乙酰壳多糖/干扰RNA纳米颗粒通过聚阳离子的自组装通过氨基的脱乙酰壳多糖中的正电荷和由磷酸基团上的干扰RNA 19的骨干承载负电荷之间的静电引力干扰RNA形成。所述的程序是与两个长的dsRNA分子（以下简称为双链RNA）或双链的siRNA（以下简称为干扰）兼容。以下的合成，脱乙酰壳多糖/干扰RNA纳米颗粒混合，幼虫的食物，并传送到幼虫通过口服。这种方法相对便宜，只需要很少的设备和劳动力19，并有利于多种表型，包括行为20,21的分析的高通量分析。这种方法，可以适用于在其他昆虫，包括其它疾病的载体和昆虫农业害虫的基因沉默研究，有可能在各种其他动物物种的用于基因沉默。此外，脱乙酰壳多糖，一种廉价，无毒，可生物降解的聚合物22，有可能被利用在该领域为物种特异性蚊虫控制。

<table><tbody><tr><td>0.02 ml pipetteman</td><td>Rainin</td><td>PR20</td><td>for resuspension of interfering RNA</td></tr><tr><td>0.2 ml pipetteman</td><td>Rainin</td><td>PR200</td><td>for resuspension of interfering RNA and preparation of interfering RNA/nanoparticles</td></tr><tr><td>0.5 ml graduated tube&amp;nbsp;</td><td>Fischer Scientific</td><td>05-408-120</td><td>for aliquoting resuspended interfering RNA</td></tr><tr><td>1 ml pipetteman</td><td>Rainin</td><td>PR1000</td><td>for resuspension of interfering RNA and preparation of interfering RNA/nanoparticles</td></tr><tr><td>1.5 ml graduated tube&amp;nbsp;</td><td>Fischer Scientific</td><td>05-408-046</td><td>for preparation of interfering RNA/nanoparticles</td></tr><tr><td>1M Sodium Acetate, pH 4.5</td><td>TEKnova</td><td>S0299</td><td>to prepare sodium acetate buffer</td></tr><tr><td>Acetic Acid, AIRSTAR. ACS, USP, FCC Grade</td><td>BDH</td><td>VWR BDH3092-500MLP</td><td>to prepare sodium acetate buffer</td></tr><tr><td>Agarose Genetic Technology Grade</td><td>MP Biomedicals LLC.</td><td>800668</td><td>to coat prepared interfering RNA/nanoparticles</td></tr><tr><td>Centrifuge</td><td>Eppendorf AG</td><td>5415D</td><td>to pellet interfering RNA/nanoparticles</td></tr><tr><td>Chitosan, from shrimp shells</td><td>Sigma-Aldrich</td><td>C3646-25G</td><td>to combine with interfering RNA for prepararation of interfering RNA/nanoparticles</td></tr><tr><td>Dry Yeast</td><td>Universal Food Corp</td><td>NA</td><td>to prepare mosquito larval food with interfering RNA/nanoparticles</td></tr><tr><td>E-RNAi tool</td><td>German Cancer Research Center</td><td>NA</td><td>for design of dsRNA; http://www.dkfz.de/signaling/e-rnai3//</td></tr><tr><td>goldfish food</td><td>Wardley</td><td>Goldfish FLAKE FOOD</td><td>to prepare mosquito larval food with interfering RNA/nanoparticles</td></tr><tr><td>Heated water bath</td><td>Thermo Scientific</td><td>51221048</td><td>to heat the interfering RNA/nanoparticles at 55&lt;sup&gt;o&lt;/sup&gt;C</td></tr><tr><td>Ice</td><td>not applicable</td><td>not applicable</td><td>for thawing interfering RNA and preparation of interfering RNA/nanoparticles</td></tr><tr><td colspan="4">[header]</td></tr><tr><td>Ice bucket</td><td>Fisher Scientific</td><td>02-591-44</td><td>for storage of ice used during the procedure</td></tr><tr><td>liver powder</td><td>MP Biomedicals LLC.</td><td>900396</td><td>to feed mosquito larvae post interfering RNA/nanoparticle treatment</td></tr><tr><td>Microwave oven</td><td>A variety of vendors</td><td>not applicable</td><td>to prepare 2% agarose solution</td></tr><tr><td>petridish (100 x 15 mm)</td><td>Fischer Scientific</td><td>875713</td><td>interfering RNA/nanoparticle feeding chamber for larvae</td></tr><tr><td>pH meter</td><td>Mettler Toledo</td><td>S220</td><td>for preparation of buffers</td></tr><tr><td>Razor blade</td><td>Fischer Scientific</td><td>12-640</td><td>to divide the interfering RNA/nanoparticle pellet for feedings</td></tr><tr><td>siRNA</td><td>Thermo Scientific/Dharmacon</td><td>custom</td><td>for preparation of siRNA/nanoparticles</td></tr><tr><td>Sodium Sulfate, Anhydrous (Na&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;)</td><td>BDH/distributed by VWR</td><td>VWR BDH0302-500G</td><td>to prepare 50 mM sodium sulfate solution in which the interfering RNA will be resuspended</td></tr><tr><td>Thermometer</td><td>VWR</td><td>61066-046</td><td>to measure the water bath temperature</td></tr><tr><td>Tooth picks</td><td>VWR</td><td>470146-908</td><td>for stirring during interfering RNA/nanoparticle food preparation and cutting gel pellets</td></tr><tr><td>Ultralow freezer</td><td>A variety of vendors</td><td>not applicable</td><td>for storage of interfering RNA aliquots and interfering RNA/nanoparticles at -80&lt;sup&gt;o&lt;/sup&gt;C</td></tr><tr><td>Vortex mixer</td><td>Fischer Scientific</td><td>02-216-108</td><td>for preparation of chitosan/interfering RNA</td></tr><tr><td>Weight paper</td><td>Fischer Scientific</td><td>NC9798735</td><td>to divide the interfering RNA/nanoparticle pellet for feedings</td></tr></tbody></table>

chitosan/interfering rna nanoparticle mediated gene silencing in disease vector mosquito larvae

蚊子造成更多人的痛苦比任何其他生物-和杀死每年有超过百万人。蚊子基因组计划推动研究蚊子生物学的新方面，包括在初级非洲疟蚊冈比亚按蚊和登革热和黄热病载体埃及伊蚊功能基因研究。核糖核酸干扰 - （RNAi-）介导的基因沉默已用于靶向目的基因在这两种疾病的载体蚊子物种。在这里，我们描述了一个程序，制备壳聚糖/干扰RNA纳米颗粒相结合，与食物和幼虫摄取。这种技术上简单，高通量，并且相对便宜的方法，这是与长双链RNA（dsRNA）的或小的干扰RNA（siRNA）分子相容，已经使用了若干在A中不同基因的成功击倒冈比亚和A.伊蚊幼虫。以下幼虫喂食，击倒，这是通过定量RT-PCR或原位杂交证实，可以持续至少通过后期蛹期。这种方法可以适用于各种各样的蚊子和其它昆虫物种，包括农业害虫，以及其它非模式生物。除了其在研究实验室工具，在未来，脱乙酰壳多糖，一种廉价，无毒和可生物降解的聚合物，有可能被利用在该领域。

<html> 冈比亚按蚊: 壳聚糖/双链RNA纳米颗粒由于脱乙酰壳多糖的氨基和dsRNA的磷酸基团之间的静电相互作用形成。 dsRNA的掺入效率为纳米粒子通常为90％以上，是因为通过从溶液耗尽dsRNA的测量。原子力显微镜图像表明，在直径壳聚糖的dsRNA粒径的平均值为140nm，从100-200纳米（ 图1）。 <img alt="图1" s...

Watch this Scientific Journal Video about Chitosan/Interfering RNA Nanoparticle Mediated Gene Silencing in Disease Vector Mosquito Larvae at JoVE.com

Chitosan/Interfering RNA Nanoparticle Mediated Gene Silencing in Disease Vector Mosquito Larvae

这里，我们描述了通过使用脱乙酰壳多糖的抑制病媒蚊基因功能/干扰是由幼虫摄取的RNA纳米颗粒的过程。

壳聚糖/干扰RNA纳米介导的基因沉默的疾病病媒蚊幼虫

Vector mosquitoes inflict more human suffering than any other organism&#8212;and kill more than one million people each year. The mosquito genome projects ...

chitosaninterfering-rna-nanoparticle-mediated-gene-silencing-disease

Research

JoVE Journal

Biology

14.3K 次观看.  Kansas State University. 这里，我们描述了通过使用脱乙酰壳多糖的抑制病媒蚊基因功能/干扰是由幼虫摄取的RNA纳米颗粒的过程。 

视频: Chitosan/Interfering RNA Nanoparticle Mediated Gene Silencing in Disease Vector Mosquito Larvae

Protocol for RNAi Assays in Adult Mosquitoes (A. gambiae)

Reverse genetic approaches have proven extremely useful for determining  which genes underly resistance to vector pathogens in mosquitoes.  This video protocol illustrates a method used by the Dimopoulos lab to inject dsRNA into Anopheles gambiae mosquitoes, which harbor the malaria parasite.  The technique manipulating the injection setup and injecting dsRNA into the thorax is illustrated.

Protocol for RNAi Assays in Adult Mosquitoes A. gambiae

Reverse genetic approaches have proven extremely useful for determining which genes underly resistance to vector pathogens in mosquitoes. This video protocol illustrates a method used by the Dimopoulos lab to inject dsRNA into Anopheles gambiae mosquitoes, which harbor the malaria parasite. The technique manipulating the injection setup and injecting dsRNA into the thorax is illustrated.

成蚊（冈比亚按蚊的RNAi实验议定书）

Reverse genetic approaches have proven extremely useful for determining  which genes underly resistance to vector pathogens in mosquitoes.  This video ...

科研

生物学

Double-stranded RNA Oral Delivery Methods to Induce RNA Interference in Phloem and Plant-sap-feeding Hemipteran Insects

Phloem and plant sap feeding insects invade the integrity of crops and fruits to retrieve nutrients, in the process damaging food crops. Hemipteran insects account for a number of economically substantial pests of plants that cause damage to crops by feeding on phloem sap. The brown marmorated stink bug (BMSB), Halyomorpha halys (Heteroptera: Pentatomidae) and the Asian citrus psyllid (ACP), Diaphorina citri Kuwayama (Hemiptera: Liviidae) are hemipteran insect pests introduced in North America, where they are an invasive agricultural pest of high-value specialty, row, and staple crops and citrus fruits, as well as a nuisance pest when they aggregate indoors. Insecticide resistance in many species has led to the development of alternate methods of pest management strategies. Double-stranded RNA (dsRNA)-mediated RNA interference (RNAi) is a gene silencing mechanism for functional genomic studies that has potential applications as a tool for the management of insect pests. Exogenously synthesized dsRNA or small interfering RNA (siRNA) can trigger highly efficient gene silencing through the degradation of endogenous RNA, which is homologous to that presented. Effective and environmental use of RNAi as molecular biopesticides for biocontrol of hemipteran insects requires the in vivo delivery of dsRNAs through feeding. Here we demonstrate methods for delivery of dsRNA to insects: loading of dsRNA into green beans by immersion, and absorbing of gene-specific dsRNA with oral delivery through ingestion. We have also outlined non-transgenic plant delivery approaches using foliar sprays, root drench, trunk injections as well as clay granules, all of which may be essential for sustained release of dsRNA. Efficient delivery by orally ingested dsRNA was confirmed as an effective dosage to induce a significant decrease in expression of targeted genes, such as juvenile hormone acid O-methyltransferase (JHAMT) and vitellogenin (Vg). These innovative methods represent strategies for delivery of dsRNA to use in crop protection and overcome environmental challenges for pest management.

This article demonstrates novel techniques developed for oral delivery of double-stranded RNA (dsRNA) through the vascular tissues of plants for RNA interference (RNAi) in phloem sap feeding insects.

双链 rna 口服法诱导韧皮部和植物-sap 喂养 Hemipteran 昆虫 rna 干扰

Phloem and plant sap feeding insects invade the integrity of crops and fruits to retrieve nutrients, in the process damaging food crops. Hemipteran ...

环境科学

Reproducible dsRNA Microinjection and Oviposition Bioassay in Mosquitoes and House Flies

Synthetic dsRNAs, used to induce RNA interference, may have dose dependent phenotypic effects. These effects are difficult to define if the dsRNAs are delivered using a non-quantitative method. Accurate delivery of known quantities of nucleic acids or other chemicals is critical to measure the efficacy of the compound being tested and to allow reliable comparison between compounds.
Here we provide a reproducible, quantitative microinjection protocol that ensures accurate delivery of specific doses of dsRNA, reducing the mortality typically induced by injection injury. These modifications include the addition of Rhodamine B, a graduated injection needle, and an improved recovery method borrowed from Isoe and Collins. This method allows calculation of dose responses and facilitates comparisons between compounds. Versions of this method have been successfully used on three genera of mosquitoes as well as house flies to assess the reduction in fecundity resulting from gene silencing of ribosomal RNA transcripts.
This protocol provides strategies to reduce several challenges of small insect microinjection. Together, mechanical delivery of dsRNAs accompanied by visual verification, identification of effective locations for delivery, and inclusion of a post-injection recovery period ensure accurate dosing and low injury mortality. This protocol also describes an oviposition bioassay for uniform determination of effects on fecundity.

This protocol describes a microinjection methodology that we have standardized and used for several years to deliver specific quantities of nucleic acids directly to the hemolymph of mosquitoes and house flies. This protocol results in minimal injection mortality and allows dose correlated measurements of fecundity.

可重复的 dsrna 微注射和蚊子和家蝇的奥维恩生物测定

Synthetic dsRNAs, used to induce RNA interference, may have dose dependent phenotypic effects. These effects are difficult to define if the dsRNAs are ...

Use of a Recombinant Mosquito Densovirus As a Gene Delivery Vector for the Functional Analysis of Genes in Mosquito Larvae

In vivo microinjection is the most commonly used gene transfer technique for analyzing the gene functions in individual mosquitoes. However, this method requires a more technically demanding operation and involves complicated procedures, especially when used in larvae due to their small size, relatively thin and fragile cuticle, and high mortality, which limit its application. In contrast, viral vectors for gene delivery have been developed to surmount extracellular and intracellular barriers. These systems have the advantages of easy manipulation, high gene transduction efficiency, long-term maintenance of gene expression, and the ability to produce persistent effects in vivo. Mosquito densoviruses (MDVs) are mosquito-specific, small single-stranded DNA viruses that can effectively deliver foreign nucleic acids into mosquito cells; however, the replacement or insertion of foreign genes to create recombinant viruses typically causes a loss of packaging and/or replication abilities, which is a barrier to the development of these viruses as delivery vectors.
Herein, we report using an artificial intronic small-RNA expression strategy to develop a non-defective recombinant Aedes aegypti densovirus (AaeDV) in vivo delivery system. Detailed procedures for the construction, packaging and quantitative analysis of the rAaeDV vectors, and for larval infection are described.
This study demonstrates, for the first time, the feasibility of developing a non-defective recombinant MDV micro RNA (miRNA) expression system, and thus providing a powerful tool for the functional analysis of genes in mosquito and establishing a basis for the application of viral paratransgenesis for controlling mosquito-borne diseases. We demonstrated that Aedes albopictus 1st instar larvae could be easily and effectively infected by introducing the virus into the water body of the larvae breeding site and that the developed rAaeDVs could be used to overexpress or knock down the expression of a specific target gene in larvae, providing a tool for the functional analysis of mosquito genes.

We report using an artificial intronic small RNA expression strategy to develop a non-defective recombinant Aedes aegypti densovirus (AaeDV) in vivo delivery system. A detailed procedure for the construction, packaging, and quantitative analysis of the rAaeDV vectors as well as for larval infection is described.

应用重组蚊子核作为基因载体, 用于蚊幼虫基因功能分析

In vivo microinjection is the most commonly used gene transfer technique for analyzing the gene functions in individual mosquitoes. However, this method ...

发育生物学

RNA Interference in Aquatic Beetles as a Powerful Tool for Manipulating Gene Expression at Specific Developmental Time Points

RNA interference (RNAi) remains a powerful technique that allows for the targeted reduction of gene expression through mRNA degradation. This technique is applicable to a wide variety of organisms and is highly efficient in the species-rich order Coleoptera (beetles). Here, we summarize the necessary steps for developing this technique in a novel organism and illustrate its application to the different developmental stages of the aquatic diving beetle Thermonectus marmoratus. Target gene sequences can be obtained cost-effectively through the assembly of transcriptomes against a close relative with known genomics or de novo. Candidate gene cloning utilizes a specific cloning vector (the pCR4-TOPO plasmid), which allows the synthesis of double-stranded RNA (dsRNA) for any gene with the use of a single common primer. The synthesized dsRNA can be injected into either embryos for early developmental processes or larvae for later developmental processes. We then illustrate how RNAi can be injected into aquatic larvae using immobilization in agarose. To demonstrate the technique, we provide several examples of RNAi experiments, generating specific knockdowns with predicted phenotypes. Specifically, RNAi for the tanning gene laccase2 leads to cuticle lightening in both larvae and adults, and RNAi for the eye pigmentation gene white produces a lightening/lack of pigmentation in eye tubes. In addition, the knockdown of a key lens protein leads to larvae with optical deficiencies and a reduced ability to hunt prey. Combined, these results exemplify the power of RNAi as a tool for investigating both morphological patterning and behavioral traits in organisms with only transcriptomic databases.

RNA interference is a widely applicable, powerful technique for manipulating gene expression at specific developmental stages. Here, we describe the necessary steps for implementing this technique in the aquatic diving beetle Thermonectus marmoratus, from the acquisition of gene sequences to the knockdown of genes that affect structure or behavior.

水生甲壳虫中的RNA干扰是特定发育时间点操纵基因表达的有力工具

RNA interference (RNAi) remains a powerful technique that allows for the targeted reduction of gene expression through mRNA degradation. This technique is ...

RNAi-mediated Gene Knockdown and In Vivo Diuresis Assay in Adult Female Aedes aegypti Mosquitoes

This video protocol demonstrates an effective technique to knockdown a particular gene in an insect and conduct a novel bioassay to measure excretion rate. This method can be used to obtain a better understanding of the process of diuresis in insects and is especially useful in the study of diuresis in blood-feeding arthropods that are able to take up huge amounts of liquid in a single blood meal. 
This RNAi-mediated gene knockdown combined with an in vivo diuresis assay was developed by the Hansen lab to study the effects of RNAi-mediated knockdown of aquaporin genes on Aedes aegypti mosquito diuresis1. 
The protocol is setup in two parts: the first demonstration illustrates how to construct a simple mosquito injection device and how to prepare and inject dsRNA into the thorax of mosquitoes for RNAi-mediated gene knockdown. The second demonstration illustrates how to determine excretion rates in mosquitoes using an in vivo bioassay.

RNAi-mediated Gene Knockdown and In Vivo Diuresis Assay in Adult Female Aedes aegypti Mosquitoes

In this protocol we combine RNAi-mediated gene silencing with an in vivo diuresis assay to study the effects knockdown of genes of interest has on mosquito fluid excretion.

RNAi介导的基因敲除和<em&gt;在体内</em在成年女性利尿含量<em&gt;埃及伊蚊</em&gt;蚊子

This video protocol demonstrates an effective technique to knockdown a particular gene in an insect and conduct a novel bioassay to measure excretion ...

RNAi Trigger Delivery into Anopheles gambiae Pupae

RNA interference (RNAi), a naturally occurring phenomenon in eukaryotic organisms, is an extremely valuable tool that can be utilized in the laboratory for functional genomic studies. The ability to knockdown individual genes selectively via this reverse genetic technique has allowed many researchers to rapidly uncover the biological roles of numerous genes within many organisms, by evaluation of loss-of-function phenotypes. In the major human malaria vector Anopheles gambiae, the predominant method used to reduce the function of targeted genes involves injection of double-stranded (dsRNA) into the hemocoel of the adult mosquito. While this method has been successful, gene knockdown in adults excludes the functional assessment of genes that are expressed and potentially play roles during pre-adult stages, as well as genes that are expressed in limited numbers of cells in adult mosquitoes. We describe a method for the injection of Serine Protease Inhibitor 2 (SRPN2) dsRNA during the early pupal stage and validate SRPN2 protein knockdown by observing decreased target protein levels and the formation of melanotic pseudo-tumors in SRPN2 knockdown adult mosquitoes. This evident phenotype has been described previously for adult stage knockdown of SRPN2 function, and we have recapitulated this adult phenotype by SRPN2 knockdown initiated during pupal development. When used in conjunction with a dye-labeled dsRNA solution, this technique enables easy visualization by simple light microscopy of injection quality and distribution of dsRNA in the hemocoel.

RNAi Trigger Delivery into Anopheles gambiae Pupae

RNA interference (RNAi) is an extremely valuable tool for uncovering gene function. However, the ability to target genes using RNAi during pre-adult stages is limited in the major human malaria vector Anopheles gambiae. We describe an RNAi protocol to reduce gene function via direct injection during pupal development.

RNAi的触发传送到<em&gt;冈比亚按蚊</em&gt;蛹

RNA interference (RNAi), a naturally occurring phenomenon in eukaryotic organisms, is an extremely valuable tool that can be utilized in the laboratory ...

Practical Use of RNA Interference: Oral Delivery of Double-stranded RNA in Liposome Carriers for Cockroaches

RNA interference (RNAi) has been widely applied for uncovering the biological functions of numerous genes, and has been envisaged as a pest control tool operating by disruption of essential gene expression. Although different methods, such as injection, feeding, and soaking, have been reported for successful delivery of double-stranded RNA (dsRNA), the efficiency of RNAi through oral delivery of dsRNA is highly variable among different insect groups. The German cockroach, Blattella germanica, is highly sensitive to the injection of dsRNA, as shown by many studies published previously. The present study describes a method to demonstrate that the dsRNA encapsulated with liposome carriers is sufficient to retard the degradation of dsRNA by midgut juice. Notably, the continuous feeding of dsRNA encapsulated by liposomes significantly reduces the tubulin expression in the midgut, and led to the death of cockroaches. In conclusion, the formulation and utilization of dsRNA lipoplexes, which protect dsRNA against nucleases, could be a practical use of RNAi for insect pest control in the future.

This manuscript demonstrates the depletion of gene expression in the midgut of the German cockroach through oral ingestion of double-stranded RNA encapsulated in liposomes.

rna 干扰的实际应用: 口服双链 rna 在脂质体载体为蟑螂

RNA interference (RNAi) has been widely applied for uncovering the biological functions of numerous genes, and has been envisaged as a pest control tool ...

Effective Oral RNA Interference (RNAi) Administration to Adult Anopheles gambiae Mosquitoes

RNA interference has been a heavily utilized tool for reverse genetic analysis for two decades. In adult mosquitoes, double-stranded RNA (dsRNA) administration has been accomplished primarily via injection, which requires significant time and is not suitable for field applications. To overcome these limitations, here we present a more efficient method for robust activation of RNAi by oral delivery of dsRNA to adult Anopheles gambiae. Long dsRNAs were produced in Escherichia coli strain HT115 (DE3), and a concentrated suspension of heat-killed dsRNA-containing bacteria in 10% sucrose was offered on cotton balls ad-libitum to adult mosquitoes. Cotton balls were replaced every 2 days for the duration of the treatment. Use of this method to target doublesex (a gene involved in sex differentiation) or fork head (which encodes a salivary gland transcription factor) resulted in reduced target gene expression and/or protein immunofluorescence signal, as measured by quantitative Real-Time PCR (qRT-PCR) or fluorescence confocal microscopy, respectively. Defects in salivary gland morphology were also observed. This highly flexible, user-friendly, low-cost, time-efficient method of dsRNA delivery could be broadly applicable to target genes important for insect vector physiology and beyond.

Effective Oral RNA Interference RNAi Administration to Adult Anopheles gambiae Mosquitoes

The oral administration of dsRNA produced by bacteria, a delivery method for RNA interference (RNAi) that is routinely used in Caenorhabditis elegans, was successfully applied here to adult mosquitoes. Our method allows for robust reverse genetics studies and transmission-blocking vector studies without the use of injection.

对成年 冈比亚按蚊 的有效口服RNA干扰（RNAi）给药

RNA interference has been a heavily utilized tool for reverse genetic analysis for two decades. In adult mosquitoes, double-stranded RNA (dsRNA) ...

<meta charset="utf8"></head><body>纳米颗粒介导的 dsRNA 喂养用于家蚕幼虫基因沉默

Larval RNA Interference in Silkworm Bombyx mori through Chitosan/dsRNA Nanoparticle Delivery

The silkworm, Bombyx mori, is an important economic insect with thousands of years of history in China. Meanwhile, the silkworm is the model insect of Lepidoptera with a good accumulation of basic research. It is also the first insect in Lepidoptera with its complete genome sequenced and assembled, which provides a solid foundation for gene functional study. Although RNA interference (RNAi) is widely used in reverse gene functional study, it is refractory in silkworms and other Lepidopteran species. Previous successful RNAi-related research to deliver double-stranded RNA (dsRNA) was performed through injection only. Delivery of dsRNA through feeding is never reported. In this article, we describe step-by-step procedures to prepare the chitosan/dsRNA nanoparticles, which are fed to the silkworm larvae by ingestion. The protocol includes (i) selection of the proper stage of silkworm larvae, (ii) synthesis of dsRNA, (iii) preparation of the chitosan/dsRNA nanoparticles, and (iv) feeding the silkworm larvae with chitosan/dsRNA nanoparticles. Representative results, including gene transcript confirmation and phenotype observation, are presented. dsRNA feeding is a simple technique for RNAi in silkworm larvae. Since silkworm larvae are easy to rear and large enough to operate, it provides a good model to demonstrate larval RNAi in insects. In addition, the simplicity of this technique stimulates more student involvement in research, making silkworm larvae an ideal genetic system for use in a classroom setting.

<meta charset="utf8"></head><body>作者聚焦：通过饲喂壳聚糖纳米颗粒推进 dsRNA 递送家蚕的基因沉默研究

Presented here is a protocol for chitosan/dsRNA nanoparticle delivery in silkworm Bombyx mori larvae to induce gene silencing through ingestion.

幼虫 RNA 通过壳聚糖/dsRNA 纳米颗粒递送对 家蚕 Bombyx 的 干扰

The silkworm, Bombyx mori, is an important economic insect with thousands of years of history in China. Meanwhile, the silkworm is the model insect of ...

壳聚糖/干扰RNA纳米介导的基因沉默的疾病病媒蚊幼虫

摘要

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此视频中的章节

成蚊（冈比亚按蚊的RNAi实验议定书）

双链 rna 口服法诱导韧皮部和植物-sap 喂养 Hemipteran 昆虫 rna 干扰

可重复的 dsrna 微注射和蚊子和家蝇的奥维恩生物测定

应用重组蚊子核作为基因载体, 用于蚊幼虫基因功能分析

水生甲壳虫中的RNA干扰是特定发育时间点操纵基因表达的有力工具

RNAi介导的基因敲除和

RNAi的触发传送到

rna 干扰的实际应用: 口服双链 rna 在脂质体载体为蟑螂

对成年冈比亚按蚊的有效口服RNA干扰（RNAi）给药

幼虫 RNA 通过壳聚糖/dsRNA 纳米颗粒递送对家蚕 Bombyx 的干扰

壳聚糖/干扰RNA纳米介导的基因沉默的疾病病媒蚊幼虫

摘要

探索更多视频

此视频中的章节

成蚊（冈比亚按蚊的RNAi实验议定书）

双链 rna 口服法诱导韧皮部和植物-sap 喂养 Hemipteran 昆虫 rna 干扰

可重复的 dsrna 微注射和蚊子和家蝇的奥维恩生物测定

应用重组蚊子核作为基因载体, 用于蚊幼虫基因功能分析

水生甲壳虫中的RNA干扰是特定发育时间点操纵基因表达的有力工具

RNAi介导的基因敲除和

RNAi的触发传送到

rna 干扰的实际应用: 口服双链 rna 在脂质体载体为蟑螂

对成年 冈比亚按蚊 的有效口服RNA干扰（RNAi）给药

幼虫 RNA 通过壳聚糖/dsRNA 纳米颗粒递送对 家蚕 Bombyx 的 干扰

对成年冈比亚按蚊的有效口服RNA干扰（RNAi）给药

幼虫 RNA 通过壳聚糖/dsRNA 纳米颗粒递送对家蚕 Bombyx 的干扰