Nous remercions le Dr Richard Vallee et Brikha Shrestha de l&#39;aide pour l&#39;in utero et ex vivo des techniques d&#39;électroporation de la rétine, respectivement, et le Dr T. Sakurai pour les commentaires sur ce protocole. Ce travail a été soutenu par des subventions des National Institutes Health F31 NS051008 (TJP), la Fondation pour la Recherche Médicale, et le Human Frontier Science Program (AR) et R01 EY12736 (CM).

<ol>
	<li>Chalupa, L. M., Williams, R. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Eye Retina and the Visual Systems of the Mouse. , (2008).</li><li>Matsuda, T., Cepko, C. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Electroporation+and+RNA+interference+in+the+rodent+retina+in+vivo+and+in+vitro.">Electroporation and RNA interference in the rodent retina in vivo and in vitro.</a> Proc Natl Acad Sci U S A. 101, 16-22 (2004).</li><li>Ishikawa, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effect+of+GDNF+gene+transfer+into+axotomized+retinal+ganglion+cells+using+in+vivo+electroporation+with+a+contact+lens-type+electrode.">Effect of GDNF gene transfer into axotomized retinal ganglion cells using in vivo electroporation with a contact lens-type electrode.</a> Gene Ther. 12, 289-298 (2005).</li><li>Donovan, S. L., Dyer, M. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Preparation+and+square+wave+electroporation+of+retinal+explant+cultures.">Preparation and square wave electroporation of retinal explant cultures.</a> Nat Protoc. 1, 2710-2718 (2006).</li><li>Garcia-Frigola, C., Carreres, M. I., Vegar, C., Herrera, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Gene+delivery+into+mouse+retinal+ganglion+cells+by+in+utero+electroporation.">Gene delivery into mouse retinal ganglion cells by in utero electroporation.</a> BMC Dev Biol. 7, 103-10 (2007).</li><li>Petros, T. J., Shrestha, B. R., Mason, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Specificity+and+sufficiency+of+EphB1+in+driving+the+ipsilateral+retinal+projection.">Specificity and sufficiency of EphB1 in driving the ipsilateral retinal projection.</a> J Neurosci. 29, 3463-3474 (2009).</li></ol>

Dans cette vidéo, nous avons démontré techniques d&#39;électroporation, à la fois in utero et ex vivo, pour la livraison de gènes dans embryonnaire murin CGR. Électroporation in utero rétine fournit un mécanisme permettant de manipuler l&#39;expression des gènes dans les CGR et de visualiser leurs projections axonales in vivo. Permettre les embryons permet de survivre après la naissance examen de ces cellules GFP + projections CJR dans leur cible, le corps genouillé latéral (CGL). Ex vivo électroporation rétine fournit une capacité de plus contrôlée de cibles spécifiques des régions rétiniennes pour une utilisation avec des tests in vitro. Combinant in vivo et in vitro d&#39;analyses issus de ces techniques permet une caractérisation approfondie du développement et des projections axonales CJR dans un sous-ensemble de CGR dans un contexte par ailleurs normal. Alors que notre manifestation se concentre sur CJR axone d&#39;orientation au niveau du chiasma optique, à la fois in utero et ex vivo électroporations rétine pourrait être bénéfique pour étudier comment les perturbations dans la différenciation effet l&#39;expression des gènes du CJR, la morphologie dendritique, les propriétés électrophysiologiques, la formation des synapses et de ciblage approprié dans les zones de résiliation comme le LGN et colliculus supérieur.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">	
		
		<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>BTX Electro Square Porator ECM 830 (with foot paddle)</td>
<td>&nbsp;</td>
<td>Harvard Apparatus</td>
<td>450052</td>
<td>&nbsp;</td>
<tr>
<td>Round tweezer electrodes</td>
<td>&nbsp;</td>
<td>Nepa Gene</td>
<td>CUY650-5 or CUY650-7</td>
<td>&nbsp;</td>
<tr>
<td>Silk Sutures</td>
<td>&nbsp;</td>
<td>Henry Schein</td>
<td>101-2636</td>
<td>&nbsp;</td>
<tr>
<td>Glass micropipettes with plungers</td>
<td>&nbsp;</td>
<td>Drummond</td>
<td>5-000-1001-X10</td>
<td>&nbsp;</td>
<tr>
<td>Antibiototic-antimycotic</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>15240096</td>
<td>&nbsp;</td>
<tr>
<td>DMEM/F12 medium</td>
<td>&nbsp;</td>
<td>Gibco</td>
<td>11330057</td>
<td>&nbsp;</td>
<tr>
<td>Albumin bovine serum</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>A8806-5G</td>
<td>&nbsp;</td>
<tr>
<td>ITS supplement</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>I-1884</td>
<td>&nbsp;</td>
<tr>
<td>Penicillin-Streptomycin</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>15140-122</td>
<td>&nbsp;</td>
<tr>
<td>Methyl cellulose</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>M0512</td>
<td>&nbsp;</td>
<tr>
<td>Glass Bottom Microwell Dishes</td>
<td>&nbsp;</td>
<td>MatTek Corporation</td>
<td>P35G-1.5-14-C</td>
<td>&nbsp;</td>
<tr>
<td>Poly-L-ornithine</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>P4957</td>
<td>&nbsp;</td>
<tr>
<td>Laminin</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>23017-015</td>
<td>&nbsp;</td>		</tbody>
		</table>
		</div>

in utero and ex vivo electroporation for gene expression in mouse retinal ganglion cells

La rétine et ses neurones de sortie seule, la cellule ganglionnaires de la rétine (CJR), comprennent un excellent modèle dans lequel l&#39;examen des questions biologiques tels que la différenciation cellulaire, guidage axonal, organisation rétinotopiques et [1] la formation des synapses. Un inconvénient est l&#39;impossibilité de manière efficace et fiable de manipuler l&#39;expression des gènes dans les CGR in vivo, en particulier dans le autrement accessible murin voies visuelles. Les souris transgéniques peuvent être utilisés pour manipuler l&#39;expression des gènes, mais cette approche est souvent coûteux, prend du temps, et peut produire des effets secondaires indésirables. En poussin, de l&#39;électroporation in ovo est utilisée pour manipuler l&#39;expression des gènes dans le CGR pour examiner la rétine et le développement du CJR. Bien que les techniques d&#39;électroporation similaires ont été développés dans souriceaux nouveau-nés [2], chez le rat adulte [3], et embryonnaires murines in vitro de la rétine [4], aucune de ces stratégies permettent une caractérisation complète de développement et des projections axonales CJR in vivo. À cette fin, nous avons développé deux applications de l&#39;électroporation, une in utero et ex vivo d&#39;autres, de cibler spécifiquement embryon murin CGR [5, 6]. Avec l&#39;électroporation in utero de la rétine, on peut réguler négativement ou misexpress gènes spécifiques dans CGR et de suivre leurs projections axonales par les voies visuelles in vivo, permettant l&#39;examen des décisions d&#39;orientation à des objectifs intermédiaires, comme le chiasma optique, ou à des régions cibles, tels que le corps genouillé latéral. Perturber l&#39;expression des gènes dans un sous-ensemble de CGR dans un contexte autrement type sauvage facilite la compréhension de la fonction des gènes à travers la voie de la rétine. De plus, nous avons développé une technique d&#39;accompagnement pour l&#39;analyse de la croissance axonale CJR in vitro. Nous électroporation d&#39;embryons têtes ex vivo, de collecter et incuber toute la rétine, puis préparer les explants à partir de ces jours rétine plus tard. Explants rétiniens peut être utilisé dans une variété d&#39;essais in vitro afin d&#39;examiner la réponse des axones électroporées CJR à des signaux de guidage ou d&#39;autres facteurs. En somme, cet ensemble de techniques accroît notre capacité à réguler négativement ou misexpress gènes dans CGR et devrait grandement aider études examinant le développement du CJR et des projections axonales.

Watch this Scientific Journal Video about In utero and ex vivo Electroporation for Gene Expression in Mouse Retinal Ganglion Cells at JoVE.com

In utero and ex vivo Electroporation for Gene Expression in Mouse Retinal Ganglion Cells

Nous présentons ici deux techniques pour la manipulation de l&#39;expression génique dans des cellules murines ganglionnaires de la rétine (CGR) en<em&gt; In utero</em&gt; Et<em&gt; Ex vivo</em&gt; Électroporation. Ces techniques permettent d&#39;examiner comment des altérations de l&#39;expression des gènes affectent le développement du CJR, guidage axonal, et les propriétés fonctionnelles.

En électroporation in vivo et ex utero pour l&#39;expression génique dans les cellules ganglionnaires de la rétine de la souris

The retina and its sole output neuron, the retinal ganglion cell (RGC), comprise an excellent model in which to examine biological questions such as cell ...

in-utero-ex-vivo-electroporation-for-gene-expression-mouse-retinal

Research

JoVE Journal

Biology

In utero and ex vivo Electroporation for Gene Expression in Mouse Retinal Ganglion Cells

18.7K vues.  Columbia University College of Physicians and Surgeons. Nous présentons ici deux techniques pour la manipulation de l'expression génique dans des cellules murines ganglionnaires de la rétine (CGR) en In utero Et Ex vivo Électroporation. Ces techniques permettent d'examiner comment des altérations de l'expression des gènes affectent le développement du CJR, guidage axonal, et les propriétés fonctionnelles.

Vidéo: In utero and ex vivo Electroporation for Gene Expression in Mouse Retinal Ganglion Cells

In Utero Intraventricular Injection and Electroporation of E16 Rat Embryos

In-utero in-vivo injection and electroporation of the embryonic rat neocortex provides a powerful tool for the manipulation of individual progenitors lining the walls of the lateral ventricle. This technique is now widely used to study the processes involved in corticogenesis by over-expressing or knocking down genes and observing the effects on cellular proliferation, migration, and differentiation. In comparison to traditional knockout strategies, in-utero electroporation provides a rapid means to manipulate a population of cells during a specific temporal window. In this video protocol, we outline the experimental methodology for preparing rats for surgery, exposing the uterine horns through laporatomy, injecting DNA into the lateral ventricles of the developing embryo, electroporating DNA into the progenitors lining the lateral wall, and caring for animals post-surgery. Our laboratory uses this protocol for surgeries on E15-E21 rats, however it is most commonly performed at E16 as shown in this video.

En injection intraventriculaire Utero et l&#39;électroporation d&#39;embryons de rat E16

In-utero in-vivo injection and electroporation of the embryonic rat neocortex provides a powerful tool for the manipulation of individual progenitors ...

Recherche

Biologie

In Utero Intraventricular Injection and Electroporation of E15 Mouse Embryos

In-utero in-vivo injection and electroporation of the embryonic mouse neocortex provides a powerful tool for the manipulation of individual progenitors lining the walls of the lateral ventricle. This technique is now widely used to study the processes involved in corticogenesis by over-expressing or knocking down genes and observing the effects on cellular proliferation, migration, and differentiation. In comparison to traditional knockout strategies, in-utero electroporation provides a rapid means to manipulate a population of cells during a specific temporal window. In this video protocol we outline the experimental methodology for preparing mice for surgery, exposing the uterine horns through laporatomy, injecting DNA into the lateral ventricles of the developing embryo, electroporating DNA into the progenitors lining the lateral wall, and caring for animals post-surgery. Our laboratory uses this protocol for surgeries on E13-E16 mice, however, it is most commonly performed at E15, as shown in this video. 

En injection intraventriculaire Utero et l&#39;électroporation d&#39;embryons de souris E15

In-utero in-vivo injection and electroporation of the embryonic mouse neocortex provides a powerful tool for the manipulation of individual progenitors ...

The Preparation of Primary Hematopoietic Cell Cultures From Murine Bone Marrow for Electroporation

It is becoming increasingly apparent that electroporation is the most effective way to introduce plasmid DNA or siRNA into primary cells. The Gene Pulser MXcell  electroporation system and Gene Pulser  electroporation buffer were specifically developed to transfect nucleic acids into mammalian cells and difficult-to-transfect cells, such as primary and stem cells.This video demonstrates how to establish primary hematopoietic cell cultures from murine bone marrow, and then prepare them for electroporation in the MXcell system. We begin by isolating femur and tibia. Bone marrow from both femur and tibia are then harvested and cultures are established. Cultured bone marrow cells are then transfected and analyzed.

This procedure describes how to establish primary hematopoietic cell cultures from murine bone marrow and is followed by transfection using the Gene Pulser MXCell electroporation system.

La préparation des cultures primaires de cellules hématopoïétiques de la moelle osseuse murine pour l&#39;électroporation

It is becoming increasingly apparent that electroporation is the most effective way to introduce plasmid DNA or siRNA into primary cells. The Gene Pulser ...

Using the Gene Pulser MXcell Electroporation System to Transfect Primary Cells with High Efficiency

It is becoming increasingly apparent that electroporation is the most effective way to introduce plasmid DNA or siRNA into primary cells. The Gene Pulser MXcell electroporation system and Gene Pulser electroporation buffer (Bio-Rad) were specifically developed to easily transfect nucleic acids into mammalian cells and difficult-to-transfect cells, such as primary and stem cells. We will demonstrate how to perform a simple experiment to quickly identify the best electroporation conditions. We will demonstrate how to run several samples through a range of electroporation conditions so that an experiment can be conducted at the same time as optimization is performed. We will also show how optimal conditions identified using 96-well electroporation plates can be used with standard electroporation cuvettes, facilitating the switch from electroporation plates to electroporation cuvettes while maintaining the same electroporation efficiency. In the video, we will also discuss some of the key factors that can lead to the success or failure of electroporation experiments.

This procedure shows how to use the Gene Pulser MXcell electroporation system to rapidly and easily identify the best electroporation conditions for mouse embryonic fibroblasts (MEFs) or other primary cells. Considerations for troubleshooting are also discussed in the associated video.

Utilisation du système d&#39;électroporation Gene Pulser MXcell à transfecter des cellules primaires à haut rendement

Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells

The use of siRNA mediated gene knockdown is continuing to be an important tool in studies of gene expression.  siRNA studies are being conducted not only to study the effects of downregulating single genes, but also to interrogate signaling pathways and other complex interaction networks.  These pathway analyses require both the use of relevant cellular models and methods that cause less perturbation to the cellular physiology.  Electroporation is increasingly being used as an effective way to introduce siRNA and other nucleic acids into difficult to transfect cell lines and primary cells without altering the signaling pathway under investigation. There are multiple critical steps to a successful siRNA experiment, and there are ways to simplify the work while improving the data quality at several experimental stages.  To help you get started with your siRNA mediated gene knockdown project, we will demonstrate how to perform a pathway study complete from collecting and counting the cells prior to electroporation through post transfection real-time PCR gene expression analysis.  The following study investigates the role of the transcriptional activator STAT6 in IL-4 dependent gene expression of CCL17 in a Burkitt lymphoma cell line (Namalwa).  The techniques demonstrated are useful for a wide range of siRNA-based experiments on both adherent and suspension cells.  We will also show how to streamline cell counting with the TC10 automated cell counter, how to electroporate multiple samples simultaneously using the MXcell electroporation system, and how to simultaneously assess RNA quality and quantity with the Experion automated electrophoresis system.

This procedure describes a quick and easy workflow to introduce siRNA into difficult to transfect cell lines and follow gene expression by real-time PCR. Use of an automated cell counter, multi-well electroporation plate, and automated electrophoresis station provide quick and reliable results without the need for expensive robotic handling.

Aide d&#39;un compteur de cellules automatisé pour simplifier les études d&#39;expression génique: Knockdown siRNA de l&#39;IL-4 dans l&#39;expression des gènes dépendant cellules Namalwa

The use of siRNA mediated gene knockdown is continuing to be an important tool in studies of gene expression.  siRNA studies are being conducted not only ...

In vitro Reconstitution of the Active T. castaneum Telomerase

Efforts to isolate the catalytic subunit of telomerase, TERT, in sufficient quantities for structural studies, have been met with limited success for more than a decade. Here, we present methods for the isolation of the recombinant Tribolium castaneum TERT (TcTERT) and the reconstitution of the active T. castaneum telomerase ribonucleoprotein (RNP) complex in vitro.
Telomerase is a specialized reverse transcriptase1 that adds short DNA repeats, called telomeres, to the 3' end of linear chromosomes2 that serve to protect them from end-to-end fusion and degradation. Following DNA replication, a short segment is lost at the end of the chromosome3 and without telomerase, cells continue dividing until eventually reaching their Hayflick Limit4. Additionally, telomerase is dormant in most somatic cells5 in adults, but is active in cancer cells6 where it promotes cell immortality7.
The minimal telomerase enzyme consists of two core components: the protein subunit (TERT), which comprises the catalytic subunit of the enzyme and an integral RNA component (TER), which contains the template TERT uses to synthesize telomeres8,9. Prior to 2008, only structures for individual telomerase domains had been solved10,11. A major breakthrough in this field came from the determination of the crystal structure of the active12, catalytic subunit of T. castaneum telomerase, TcTERT1.
Here, we present methods for producing large quantities of the active, soluble TcTERT for structural and biochemical studies, and the reconstitution of the telomerase RNP complex in vitro for telomerase activity assays. An overview of the experimental methods used is shown in Figure 1.

In vitro Reconstitution of the Active T. castaneum Telomerase

Efforts to isolate the catalytic subunit of telomerase, TERT, in sufficient quantities for structural studies, have been met with limited success for more than a decade. Here, we present methods for the isolation of the recombinant Tribolium castaneum TERT (TcTERT) and the reconstitution of the active T. castaneum telomerase ribonucleoprotein (RNP) complex in vitro.

La reconstitution in vitro de l&#39;actif T. La télomérase castaneum

Efforts to isolate the catalytic subunit of telomerase, TERT, in sufficient quantities for structural studies, have been met with limited success for more ...

Using SecM Arrest Sequence as a Tool to Isolate Ribosome Bound Polypeptides

Extensive research has provided ample evidences suggesting that protein folding in the cell is a co-translational process1-5. However, the exact pathway that polypeptide chain follows during co-translational folding to achieve its functional form is still an enigma. In order to understand this process and to determine the exact conformation of the co-translational folding intermediates, it is essential to develop techniques that allow the isolation of RNCs carrying nascent chains of predetermined sizes to allow their further structural analysis.
SecM (secretion monitor) is a 170 amino acid E. coli protein that regulates expression of the downstream SecA (secretion driving) ATPase in the secM-secA operon6. Nakatogawa and Ito originally found that a 17 amino acid long sequence (150-FSTPVWISQAQGIRAGP-166) in the C-terminal region of the SecM protein is sufficient and necessary to cause stalling of SecM elongation at Gly165, thereby producing peptidyl-glycyl-tRNA stably bound to the ribosomal P-site7-9. More importantly, it was found that this 17 amino acid long sequence can be fused to the C-terminus of virtually any full-length and/or truncated protein thus allowing the production of RNCs carrying nascent chains of predetermined sizes7. Thus, when fused or inserted into the target protein, SecM stalling sequence produces arrest of the polypeptide chain elongation and generates stable RNCs both in vivo in E. coli cells and in vitro in a cell-free system. Sucrose gradient centrifugation is further utilized to isolate RNCs.
The isolated RNCs can be used to analyze structural and functional features of the co-translational folding intermediates. Recently, this technique has been successfully used to gain insights into the structure of several ribosome bound nascent chains10,11. Here we describe the isolation of bovine Gamma-B Crystallin RNCs fused to SecM and generated in an in vitro translation system.

We describe here a technique that is now routinely used to isolate stably bound ribosome nascent chain complexes (RNCs). This technique takes advantage of the discovery that a 17 amino acid long SecM "arrest sequence" can halt translation elongation in a prokaryotic (E. coli) system, when inserted into (or fused to the C-terminus) of virtually any protein.

Utilisation de la séquence d&#39;arrêt SecM comme un outil pour isoler les polypeptides Ribosome Bound

Extensive research has provided ample evidences suggesting that protein folding in the cell is a co-translational process1-5. However, the exact pathway ...

Gene Transfer into Older Chicken Embryos by ex ovo Electroporation

The chicken embryo provides an excellent model system for studying gene function and regulation during embryonic development. In ovo electroporation is a powerful method to over-express exogenous genes or down-regulate endogenous genes in vivo in chicken embryos1. Different structures such as DNA plasmids encoding genes2-4, small interfering RNA (siRNA) plasmids5, small synthetic RNA oligos6, and morpholino antisense oligonucleotides7 can be easily transfected into chicken embryos by electroporation. However, the application of in ovo electroporation is limited to embryos at early incubation stages (younger than stage HH20 - according to Hamburg and Hamilton)8 and there are some disadvantages for its application in embryos at later stages (older than stage HH22 - approximately 3.5 days of development). For example, the vitelline membrane at later stages is usually stuck to the shall membrane and opening a window in the shell causes rupture of the vessels, resulting in death of the embryos; older embryos are covered by vitelline and allantoic vessels, where it is difficult to access and manipulate the embryos; older embryos move vigorously and is difficult to control the orientation through a relatively small window in the shell.
In this protocol we demonstrate an ex ovo electroporation method for gene transfer into chicken embryos at late stages (older than stage HH22). For ex ovo electroporation, embryos are cultured in Petri dishes9 and the vitelline and allantoic vessels are widely spread. Under these conditions, the older chicken embryos are easily accessed and manipulated. Therefore, this method overcomes the disadvantages of in ovo electroporation applied to the older chicken embryos. Using this method, plasmids can be easily transfected into different parts of the older chicken embryos10-12.

Gene Transfer into Older Chicken Embryos by ex ovo Electroporation

A method of gene transfer into chicken embryos at later incubation stages (older than Hamburger and Hamilton stage (HH) 22) is described. This method overcomes disadvantages of in ovo electroporation applied to older chicken embryos and is a useful technique to study gene function and regulation at older developmental stages.

Transfert de gènes dans des embryons de poulet âgés par<em&gt; Ex ovo</em&gt; Électroporation

The chicken embryo provides an  excellent model system for studying gene function and regulation during  embryonic development. In ovo electroporation is ...

siRNA Screening to Identify Ubiquitin and Ubiquitin-like System Regulators of Biological Pathways in Cultured Mammalian Cells

Post-translational modification of proteins with ubiquitin and ubiquitin-like molecules (UBLs) is emerging as a dynamic cellular signaling network that regulates diverse biological pathways including the hypoxia response, proteostasis, the DNA damage response and transcription.&#160; To better understand how UBLs regulate pathways relevant to human disease, we have compiled a human siRNA &#8220;ubiquitome&#8221; library consisting of 1,186 siRNA duplex pools targeting all known and predicted components of UBL system pathways. This library can be screened against a range of cell lines expressing reporters of diverse biological pathways to determine which UBL components act as positive or negative regulators of the pathway in question.&#160; Here, we describe a protocol utilizing this library to identify ubiquitome-regulators of the HIF1A-mediated cellular response to hypoxia using a transcription-based luciferase reporter.&#160; An initial assay development stage is performed to establish suitable screening parameters of the cell line before performing the screen in three stages: primary, secondary and tertiary/deconvolution screening. &#160;The use of targeted over whole genome siRNA libraries is becoming increasingly popular as it offers the advantage of reporting only on members of the pathway with which the investigators are most interested.&#160; Despite inherent limitations of siRNA screening, in particular false-positives caused by siRNA off-target effects, the identification of genuine novel regulators of the pathways in question outweigh these shortcomings, which can be overcome by performing a series of carefully undertaken control experiments.

Here, we describe a methodology to perform a targeted siRNA &#8220;ubiquitome&#8221; screen to identify novel ubiquitin and ubiquitin-like regulators of the HIF1A-mediated cellular response to hypoxia.&#160; This can be adapted to any biological pathway where a robust read out of reporter activity is available.

siRNA contrôle pour la ubiquitine et les régulateurs du système ubiquitine-comme des voies biologiques dans des cellules de mammifères en culture

Post-translational modification of proteins with ubiquitin and ubiquitin-like molecules (UBLs) is emerging as a dynamic cellular signaling network that ...

Measurement of Metabolic Rate in Drosophila using Respirometry

Metabolic disorders are a frequent problem affecting human health. Therefore, understanding the mechanisms that regulate metabolism is a crucial scientific task. Many disease causing genes in humans have a fly homologue, making Drosophila a good model to study signaling pathways involved in the development of different disorders. Additionally, the tractability of Drosophila simplifies genetic screens to aid in identifying novel therapeutic targets that may regulate metabolism. In order to perform such a screen a simple and fast method to identify changes in the metabolic state of flies is necessary. In general, carbon dioxide production is a good indicator of substrate oxidation and energy expenditure providing information about metabolic state. In this protocol we introduce a simple method to measure CO2 output from flies. This technique can potentially aid in the identification of genetic perturbations affecting metabolic rate.

Measurement of Metabolic Rate in Drosophila using Respirometry

Metabolic disorders are among one of the most common diseases in humans. The genetically tractable model organism D. melanogaster can be used to identify novel genes that regulate metabolism. This paper describes a relatively simple method which allows studying the metabolic rate in flies by measuring their CO2 production.