RNAi mediato silenziamento genico nelle zanzare richiede una preparazione preventiva e la purificazione della dsRNAs specifici che colpiscono il gene di interesse. Per la sintesi di dsRNA, si consiglia il kit Megascript Ambion che si avvale di un RNA polimerasi T7-mediata reazione di trascrizione in vitro. Per la purificazione dsRNA, si consiglia il kit Qiagen RNeasy. Campioni di dsRNA devono essere quantificati e regolata a 3 g / mL in acqua. Altri materiali è necessario includere: punta fine pinze, vetrino, aghi di vetro microcapillare, microinjector (usiamo Drummond Nanoject II), un microscopio ottico montato sopra un blocco freddo, una coperta piatto di vetro Petri, asciugamani di carta e un secchio di ghiaccio . Sarà inoltre necessario un modo per raccogliere le zanzare e un contenitore adeguato per loro insieme a una fonte di cibo come il batuffolo di cotone imbevuto di 10% di saccarosio. <ol><li> Raccogliere i vostri zanzare. Usando una batteria aspiratore, raccogliere le zanzare si vuole iniettare. Inserire l&#39;ugello con un tovagliolo di carta o cotone per cui non può sfuggire zanzare e rimuovere il serbatoio. Dal momento che temperature fredde anestetizzare le zanzare, seppellire il serbatoio in un secchio di ghiaccio e aspettare 5-10 minuti per le zanzare a smettere di muoversi. Anestesia può essere ottenuto anche mettendo il serbatoio in una stanza fredda o frigorifero o utilizzando CO 2. Durante questi 5-10 minuti, passare alla fase successiva. </li><li> Preparare l&#39;area di lavoro. Impostare un blocco piatta superficie fredda a 2 ° C e mettere un vetrino su di esso. Questo è dove le zanzare si riposerà come li iniettare. Inserire un ago di vetro sul microinjector e utilizzare il forcipe per rompere la punta dell&#39;ago alla larghezza desiderata. E &#39;importante che la larghezza è abbastanza grande per lasciare spazio sufficiente per liquido di fluire attraverso a un tasso ragionevole, ma è abbastanza stretto per infliggere una ferita minima durante l&#39;iniezione. Una punta dell&#39;ago bene sarà abbastanza stretto da piegare leggermente ma non si rompe. Impostare la vostra attrezzatura di iniezione per il volume di uscita desiderato (per RNAi, usiamo 69 nL). Immergere la punta del ago nella campione e disegnare il campione liquido nel ago utilizzando le istruzioni del produttore. Il campione di liquido può essere una soluzione dsRNA, sospensione batterica, o altro, il processo di iniezione è lo stesso per tutti. Incorpora un piatto di vetro Petri nel secchiello del ghiaccio in modo che il fondo del piatto è completamente contatto con il ghiaccio. Questo è dove si metteranno le zanzare finché non si è pronti a iniettare loro. </li><li> Preparare il zanzare. Transfer 50-100 zanzare dal serbatoio al piatto di vetro Petri. Usa la tua pinza sottile per loro di un unico strato, assicurandosi la maggior parte hanno contatto con il fondo del piatto freddo per tenerli anestetizzati. Coprire queste zanzare con il piatto coperchio quando non in uso. Riportare il serbatoio per il contenitore del ghiaccio per mantenere il resto delle zanzare anestetizzato. </li><li> Montare le zanzare sul blocco freddo. Usa la tua punta fine pinze per trasferire le zanzare uno alla volta dal piatto al vetrino montato sul blocco freddo sotto il microscopio ottico. Gestire le zanzare con delicatezza, preferibilmente entro le gambe. Line up fino a 30 zanzare fianco a fianco sul vetrino, facendo attenzione si può arrivare a ognuno con la microinjector e assicurandosi che ognuno entra in contatto con la diapositiva freddo. Assicurati che il tuo zanzare sono allineate in modo ordinato, che come si va avanti si sa che hanno e che non sono state iniettate. Lascia altre zanzare coperto il piatto freddo Petri. </li><li> Iniettare il primo gruppo di zanzare. Tenere il forcipe punta a punta fine in una mano e tenere la microinjector nell&#39;altra mano come una matita. Utilizzare le pinze per spostare la zanzara di cui hai bisogno (gestirli per le gambe per evitare ferite) e di mantenere la zanzara costante durante l&#39;iniezione. Questo funziona meglio se si utilizza il forcipe per supportare un lato della zanzara durante l&#39;iniezione dalla parte opposta. Inserire con attenzione solo la punta ago nel torace zanzara. E &#39;meglio per iniettare in una parte ancora tesa sottile della cuticola per minimizzare il danno. Inoltre, evitare di iniettare troppo profondamente, si vuole solo la punta di essere all&#39;interno del torace; più iniezioni di causa maggiore ferite che compromette la sopravvivenza. Una volta che la punta dell&#39;ago è in posizione, premere e rilasciare il pedale dell&#39;apparato microinjector che consegnerà il vostro volume preimpostato di dsRNA. Aspetta un secondo o due e togliere l&#39;ago dalla zanzara. Se una goccia di liquido appare al di fuori della ferita, attendere qualche secondo per essere assorbiti nella ferita. Se non assorbe in pochi secondi, scartare tale zanzara e riprovare. Continua il processo di iniezione per tutti zanzare sul vetrino. </li><li> Memorizzare le zanzare. Quando hai finito, inserire il vostro zanzare iniettato all&#39;interno di contenitori etichettati (noi preferiamo 1 pinta di cera alberato bicchieri di carta coperta damaglia metallica e fissato con elastici e un coperchio di cartone). </li><li> Continuare le iniezioni fino al termine. Continuare a posto le zanzare sul vetrino, iniettare e trasferimento in tazze fino ad avere la dimensione del campione che si desidera. Conto di alcune morti per principianti avrà molte zanzare muoiono per il trauma della iniezione. Ciò permetterà di migliorare con la pratica fino a quasi il 100% della vostra zanzare sopravvivono iniezione. </li><li> Al termine, mettere un piegata, asciugamano bagnato di carta sopra la coppa insieme a una fonte di cibo e coprire le tazze con qualcosa per trattenere l&#39;umidità, come involucro di plastica o un coperchio di plastica Petri. Zanzare iniettato sono inclini a seccarsi così l&#39;umidità fornita dal asciugamano bagnato e mantenuto dalla plastica contribuisce a prevenire questo. </li><li> Inserire il vostro zanzare in una camera ambiente controllato per l&#39;incubazione. </li></ol> Nota: L&#39;efficienza del silenziamento genico è altamente variabile e dipende da una serie di fattori tra cui trascrizione e proteine ​​tassi di turn-over, e l&#39;efficienza dsRNA assorbimento da parte delle cellule e organi. Abbiamo scoperto che il silenziamento inizia già dal 1 ° giorno dopo l&#39;iniezione, e può durare fino a 6 giorni dopo l&#39;iniezione. Utilizzare metodi di rilevamento trascrizione e proteine, come la PCR quantitativa e Western blotting per convalidare tacere. Nota: Ci sono parecchie variazioni su diverse fasi di iniezione zanzara e RNAi mediato tecnica di silenziamento genico. Alcune varianti sono descritti da: Boisson, et al (2006) e Blandin, et al (2002)...

<ol>
	<li>Boisson, ., 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=.">.</a> , (2006).</li><li>Blandin, ., 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=.">.</a> , (2002).</li></ol>

Efficienza del silenziamento genico è altamente variabile e dipende da una serie di fattori tra cui trascrizione e proteine ​​turn-over tassi ed efficienza dsRNA assorbimento da parte delle cellule e organi. Abbiamo scoperto che il silenziamento inizia già dopo 1 iniezione al giorno e può durare fino a 6 giorni dopo l&#39;iniezione. Utilizzare metodi di rilevamento trascrizione e proteine, come la PCR quantitativa e Western blotting per convalidare tacere.

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		<div>
		<table border="1">
		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
		</thead>
		<tbody>
		
<tr>
<td>Megascript</td>
<td>kit</td>
<td>Ambion</td>
<td>&nbsp;</td>
<td>for dsRNA synthesis; T7 RNA polymerase-mediated in vitro transcription reaction</td>
</tr>
<tr>
<td>RNeasy</td>
<td>&nbsp;</td>
<td>Qiagen</td>
<td>&nbsp;</td>
<td>For dsRNA purification</td>
</tr>
<tr>
<td>dsRNA</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>should be quantified and adjusted to 3 &#x03BC;g/ &#x03BC;L in water</td>
</tr>
<tr>
<td>fine-tipped forceps</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>glass slide</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>glass microcapillary needles</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>microinjector</td>
<td>&nbsp;</td>
<td>Drummond</td>
<td>Nanoject II</td>
<td>&nbsp;</td>
<tr>
<td>light microscope</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>mounted above a cold block</td>
</tr>
<tr>
<td>Petri dish</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>covered, glass</td>
</tr>
<tr>
<td>paper towels</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>10% sucrose</td>
<td>food</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>A. gambiae</td>
<td>Animal</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>mosquitos</td>
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protocol for rnai assays in adult mosquitoes (a. gambiae)

Reverse approcci genetici si sono dimostrati estremamente utili per determinare quali geni di resistenza agli agenti patogeni sottostanti vettore nelle zanzare. Questo protocollo video illustra un metodo utilizzato dal laboratorio Dimopoulos per iniettare dsRNA in zanzare Anopheles gambiae, che ospitano il parassita della malaria. La tecnica di manipolare la configurazione di iniezione e iniezione di dsRNA nel torace è illustrato.

Watch this Scientific Journal Video about Protocol for RNAi Assays in Adult Mosquitoes A. gambiae at JoVE.com

Protocol for RNAi Assays in Adult Mosquitoes A. gambiae

Protocollo per saggi RNAi in zanzare adulte (A. gambiae)

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

protocol-for-rnai-assays-in-adult-mosquitoes-a-gambiae

Research

JoVE Journal

Biology

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

12.6K Views.  Johns Hopkins University. Reverse approcci genetici si sono dimostrati estremamente utili per determinare quali geni di resistenza agli agenti patogeni sottostanti vettore nelle zanzare. Questo protocollo video illustra un metodo utilizzato dal laboratorio Dimopoulos per iniettare dsRNA in zanzare Anopheles gambiae, che ospitano il parassita della malaria. La tecnica di manipolare la configurazione di iniezione e iniezione di dsRNA nel torace è illustrato.

Video: Protocol for RNAi Assays in Adult Mosquitoes A. gambiae

Protocol for Dengue Infections in Mosquitoes (A. aegypti) and Infection Phenotype Determination

The purpose of this procedure is to infect the Aedes mosquito with dengue virus in a laboratory condition and examine the infection level and dynamic of the virus in the mosquito tissues. This protocol is routinely used for studying mosquito-virus interactions, especially for identification of novel host factors that are able to determine vector competence. The entire experiment must be conducted in a BSL2 laboratory. Similar to Plasmodium falciparum infections, proper attire including gloves and lab coat must be worn at all times. After the experiment, all the materials that came in contact with the virus need to be treated with 75% ethanol and bleached before proceeding with normal washing. All other materials need to be autoclaved before discarding them.

Protocol for Dengue Infections in Mosquitoes A. aegypti and Infection Phenotype Determination

Once a gene is identified as potentially refractory for the dengue virus, it must be evaluated for it's role in preventing viral infections within the mosquito. This protocol illustrates how the extent of dengue infections of mosquitoes can be assayed. The techniques for growing up the virus in culture, membrane feeding mosquitoes human blood, and assaying viral titers in the mosquito midgut are demonstrated.

Protocollo per la dengue in Zanzare (A. aegypti) e Fenotipo Determinazione infezione

The purpose of this procedure is to infect the Aedes mosquito with dengue virus in a laboratory condition and examine the infection level and dynamic of ...

Ricerca

Biologia

Protocol for Mosquito Rearing (A. gambiae)

This protocol describes mosquito rearing in the insectary. The insectary rooms are maintained at 28&deg;C and ~80% humidity, with a 12 hr. day/night cycle. For this procedure, you'll need mosquito cages, 10% sterile sucrose solution, paper towels, beaker, whatman filter paper, glass feeders, human blood and serum, water bath, parafilm, distilled water, clean plastic trays, mosquito food (described below), mosquito net to cover the trays, vacuum, and a collection chamber to collect adults.

Protocol for Mosquito Rearing A. gambiae

This video illustrates the general techniques used to rear Anopheles gambiae in the laboratory. The methods for caring for laboratory mosquitoes are demonstrated through all stages of the organism's life cycle from larvae to pupae to blood-feeding adults.

Protocollo per la cura dei Mosquito (A. gambiae)

This protocol describes mosquito rearing in the insectary. The insectary rooms are maintained at 28&deg;C and ~80% humidity, with a 12 hr. day/night ...

Protocol for Plasmodium falciparum Infections in Mosquitoes and Infection Phenotype Determination

Once a gene is identified as potentially refractory for malaria, it must be evaluated for its role in preventing Plasmodium infections within the mosquito.    This protocol illustrates how the extent of plasmodium infections of mosquitoes can be assayed.  The techniques for preparing the gametocyte culture, membrane feeding mosquitoes human blood, and assaying viral titers in the mosquito midgut are demonstrated.

Once a gene is identified as potentially refractory for malaria, it must be evaluated for its role in preventing Plasmodium infections within the mosquito. This protocol illustrates how the extent of plasmodium infections of mosquitoes can be assayed. The techniques for preparing the gametocyte culture, membrane feeding mosquitoes human blood, and assaying viral titers in the mosquito midgut are demonstrated.

Protocollo per Plasmodium falciparum infezioni in Fenotipo Determinazione Zanzare e infezione

Once a gene is identified as potentially refractory for malaria, it must be evaluated for its role in preventing Plasmodium infections within the ...

Building a Better Mosquito: Identifying the Genes Enabling Malaria and Dengue Fever Resistance in A. gambiae and A. aegypti Mosquitoes

In this interview, George Dimopoulos focuses on the physiological mechanisms used by mosquitoes to combat Plasmodium falciparum and dengue virus infections.   Explanation is given for how key refractory genes, those genes conferring resistance to vector pathogens, are identified in the mosquito and how this knowledge can be used to generate transgenic mosquitoes that are unable to carry the malaria parasite or dengue virus.

In this interview, George Dimopoulos focuses on the physiological mechanisms used by mosquitoes to combat Plasmodium falciparum and dengue virus infections. Explanation is given for how key refractory genes, those genes conferring resistance to vector pathogens, are identified in the mosquito and how this knowledge can be used to generate transgenic mosquitoes that are unable to carry the malaria parasite or dengue virus.

Costruire un Mosquito migliore: l&#39;identificazione dei geni Abilitazione malaria e febbre dengue Resistenza in A. gambiae e A. aegypti zanzare

In this interview, George Dimopoulos focuses on the physiological mechanisms used by mosquitoes to combat Plasmodium falciparum and dengue virus ...

MISSION esiRNA for RNAi Screening in Mammalian Cells

RNA interference (RNAi) is a basic cellular mechanism for the control of gene expression. RNAi is induced by short double-stranded RNAs also known as small interfering RNAs (siRNAs). The short double-stranded RNAs originate from longer double stranded precursors by the activity of Dicer, a protein of the RNase III family of endonucleases. The resulting fragments are components of the RNA-induced silencing complex (RISC), directing it to the cognate target mRNA. RISC cleaves the target mRNA thereby reducing the expression of the encoded protein1,2,3. RNAi has become a powerful and widely used experimental method for loss of gene function studies in mammalian cells utilizing small interfering RNAs.
Currently two main methods are available for the production of small interfering RNAs. One method involves chemical synthesis, whereas an alternative method employs endonucleolytic cleavage of target specific long double-stranded RNAs by RNase III in vitro. Thereby, a diverse pool of siRNA-like oligonucleotides is produced which is also known as endoribonuclease-prepared siRNA or esiRNA. A comparison of efficacy of chemically derived siRNAs and esiRNAs shows that both triggers are potent in target-gene silencing. Differences can, however, be seen when comparing specificity. Many single chemically synthesized siRNAs produce prominent off-target effects, whereas the complex mixture inherent in esiRNAs leads to a more specific knockdown10.
In this study, we present the design of genome-scale MISSION esiRNA libraries and its utilization for RNAi screening exemplified by a DNA-content screen for the identification of genes involved in cell cycle progression. We show how to optimize the transfection protocol and the assay for screening in high throughput. We also demonstrate how large data-sets can be evaluated statistically and present methods to validate primary hits. Finally, we give potential starting points for further functional characterizations of validated hits.

Here we use a human esiRNA library in a high-throughput screen for genes involved in cell division. We demonstrate how to set up and conduct an esiRNA screens, as well as how to analyze and validate the results.

EsiRNA MISSIONE per lo screening RNAi in cellule di mammifero

RNA interference (RNAi) is a basic cellular mechanism for the control of gene expression. RNAi is induced by short double-stranded RNAs also known as ...

Bacterial Delivery of RNAi Effectors: Transkingdom RNAi

RNA interference (RNAi) represents a high effective mechanism for specific inhibition of mRNA expression. Besides its potential as a powerful laboratory tool, the RNAi pathway appears to be promising for therapeutic utilization. For development of RNA interference (RNAi)-based therapies, delivery of RNAi-mediating agents to target cells is one of the major obstacles. A novel strategy to overcome this hurdle is transkingdom RNAi (tkRNAi). This technology uses non-pathogenic bacteria, e.g. Escherichia coli, to produce and deliver therapeutic short hairpin RNA (shRNA) into target cells to induce RNAi. A first-generation tkRNAi-mediating vector, TRIP, contains the bacteriophage T7 promoter for expression regulation of a therapeutic shRNA of interest. Furthermore, TRIP has the Inv locus from Yersinia pseudotuberculosis that encodes invasin, which permits natural noninvasive bacteria to enter &beta;1-integrin-positive mammalian cells and the HlyA gene from Listeria monocytogenes, which produces listeriolysin O. This enzyme allows the therapeutic shRNA to escape from entry vesicles within the cytoplasm of the target cell. TRIP constructs are introduced into a competent non-pathogenic Escherichia coli strain, which encodes T7 RNA polymerase necessary for the T7 promoter-driven synthesis of shRNAs. A well-characterized cancer-associated target molecule for different RNAi strategies is ABCB1 (MDR1/P-glycoprotein, MDR1/P-gp). This ABC-transporter acts as a drug extrusion pump and mediates the "classical" ABCB1-mediated multidrug resistance (MDR) phenotype of human cancer cells which is characterized by a specific cross resistance pattern. Different ABCB1-expressing MDR cancer cells were treated with anti-ABCB1 shRNA expression vector bearing E. coli. This procedure resulted in activation of the RNAi pathways within the cancer cells and a considerable down regulation of the ABCB1 encoding mRNA as well as the corresponding drug extrusion pump. Accordingly, drug accumulation was enhanced in the pristine drug-resistant cancer cells and the MDR phenotype was reversed. By means of this model the data provide the proof-of-concept that tkRNAi is suitable for modulation of cancer-associated factors, e.g. ABCB1, in human cancer cells.

For development of RNA interference (RNAi)-based therapies, a novel strategy was developed, transkingdom RNAi (tkRNAi). This technology uses non-pathogenic bacteria to produce and deliver therapeutic short hairpin RNA (shRNA) into target cells. Here, tkRNAi was successfully applied for reversal of classical ABCB1-mediated multidrug resistance (MDR) of cancer cells.

Consegna batterica di RNAi per DJ: Transkingdom RNAi

RNA interference (RNAi) represents a high effective mechanism for specific inhibition of mRNA expression. Besides its potential as a powerful laboratory ...

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-mediato Knockdown Gene e<em&gt; In Vivo</em&gt; Saggio La diuresi in femmina adulta<em&gt; Aedes aegypti</em&gt; Le zanzare

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

Endurance Training Protocol and Longitudinal Performance Assays for Drosophila melanogaster

One of the most pressing problems facing modern medical researchers is the surging levels of obesity, with the consequent increase in associated disorders such as diabetes and cardiovascular disease 1-3. An important topic of research into these associated health problems involves the role of endurance exercise as a beneficial intervention.
Exercise training is an inexpensive, non-invasive intervention with several beneficial results, including reduction in excess body fat 4, increased insulin sensitivity in skeletal muscle 5, increased anti-inflammatory and antioxidative responses 6, and improved contractile capacity in cardiomyocytes 7. Low intensity exercise is known to increase mitochondrial activity and biogenesis in humans 8 and mice, with the transcriptional coactivator PGC1-&alpha; as an important intermediate 9,10. 
Despite the importance of exercise as a tool for combating several important age-related diseases, extensive longitudinal genetic studies have been impeded by the lack of an endurance training protocol for a short-lived genetic model species. The variety of genetic tools available for use with Drosophila, together with its short lifespan and inexpensive maintenance, make it an appealing model for further study of these genetic mechanisms. With this in mind we have developed a novel apparatus, known as the Power Tower, for large scale exercise-training in Drosophila melanogaster 11. The Power Tower utilizes the flies' instinctive negative geotaxis behavior to repetitively induce rapid climbing. Each time the machine lifts, then drops, the platform of flies, the flies are induced to climb. Flies continue to respond as long as the machine is in operation or until they become too fatigued to respond. Thus, the researcher can use this machine to provide simultaneous training to large numbers of age-matched and genetically identical flies. Additionally, we describe associated assays useful to track longitudinal progress of fly cohorts during training.

Endurance Training Protocol and Longitudinal Performance Assays for Drosophila melanogaster

We describe the first endurance training protocol for an important genetic model species, Drosophila melanogaster, and outline several assays to chart improvements in mobility following training.

Endurance Training protocollo e saggi prestazioni longitudinali per Drosophila melanogaster

One of the most pressing problems facing modern medical researchers is the surging levels of obesity, with the consequent increase in associated disorders ...

A Multi-detection Assay for Malaria Transmitting Mosquitoes

The Anopheles gambiae species complex includes the major malaria transmitting mosquitoes in Africa. Because these species are of such medical importance, several traits are typically characterized using molecular assays to aid in epidemiological studies. These traits include species identification, insecticide resistance, parasite infection status, and host preference. Since populations of the Anopheles gambiae complex are morphologically indistinguishable, a polymerase chain reaction (PCR) is traditionally used to identify species. Once the species is known, several downstream assays are routinely performed to elucidate further characteristics. For instance, mutations known as KDR in a para gene confer resistance against DDT and pyrethroid insecticides. Additionally, enzyme-linked immunosorbent assays (ELISAs) or Plasmodium parasite DNA detection PCR assays are used to detect parasites present in mosquito tissues. Lastly, a combination of PCR and restriction enzyme digests can be used to elucidate host preference (e.g., human vs. animal blood) by screening the mosquito bloodmeal for host-specific DNA. We have developed a multi-detection assay (MDA) that combines all of the aforementioned assays into a single multiplex reaction genotyping 33SNPs for 96 or 384 samples at a time. Because the MDA includes multiple markers for species, Plasmodium detection, and host blood identification, the likelihood of generating false positives or negatives is greatly reduced from previous assays that include only one marker per trait. This robust and simple assay can detect these key mosquito traits cost-effectively and in a fraction of the time of existing assays.

Malaria transmitting mosquitoes have a number of epidemiologically important characteristics that can only be detected using molecular techniques. Utilizing a MALDI-TOF based SNP genotyping platform, we developed an assay for simultaneously detecting multiple key traits (species, insecticide resistance, parasite infection and host choice) of malaria vectors.

Un test multi-rilevamento per la malaria Trasmissione Zanzare

The Anopheles gambiae species complex includes the major malaria transmitting mosquitoes in Africa. Because these species are of such medical importance, ...

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 trigger consegna in<em&gt; Anopheles gambiae</em&gt; Pupe

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