Wir danken Frau V. Lephart für die Erhaltung der Bestände zu fliegen Diese Arbeit wurde vom National Institute for Health Grant (GM62916) und der National Science Foundation Grant (MCB0817107) unterstützt.

Das folgende Protokoll für Polyäthylen-Chromosom Squash Vorbereitung ist von dem Verfahren in Johansen et al angepasst. (2009). 1. Kultur des dritten Stadiums Drosophila-Larven Um eine optimale Polytänchromosomen für hochwertige Squash-Präparate zu erhalten, sind nicht überfüllt Kultivierungsbedingungen wesentlichen (dh, statt rund 20 eierlegenden Weibchen fliegt in einem Standard-4 &quot;fliegen Flaschen und wechseln Sie in eine neue Flasche pro Tag). Wählen Sie die dicksten Menschen aus dem ersten Jahrgang des Kletterns dritten Larvenstadium, während sie noch wandern, aber kurz vor der Verpuppung. Wir routinemäßig Kultur bei 21 ° C aber 18 ° C erbringt fetter Chromosomen, die besser geeignet für bestimmte Zwecke, wie zum Beispiel kann, wenn band / Interband Regionen müssen in hoher Auflösung dargestellt werden. 2. Polytäne Squash Materialien <ul><li> Drummond Dissektionszangen (2) </li><li> Petrischalen (60 x 15 mm) </li><li> Frosted Objektträger (Fisher Nr. 12-544-3) (poly-Lysin-beschichtete) </li><li> 22 x 22 mm Nr. 15 Deckgläser (Fisher Nr. 12-520B) (beschichtet mit Sigmacote; Sigma # SL2) </li><li> 22 x 40 mm Nr. 15 Deckgläser (Fisher Nr. 12-530B) </li><li> Kim-Tücher </li><li> Phasenkontrast-Mikroskop mit 20x-Objektiv </li><li> Kleine Dewar (zB Thermoskanne oder Thermosflasche) </li><li> Lange Pinzette </li><li> Rasierklingen </li><li> Coplin Jar </li><li> Gummi-Maid oder Tupperware-Fach (oder äquivalente verschließbaren Fach) </li><li> Parafilm (Schnitt in 22 mm Quadrate) </li><li> 175 g Gewicht </li></ul> 3. Fixative und Lösungen <ol><li> 5X Formaldehyd Lager. Bereiten Sie eine frische Lösung von 0,74 g. Paraformaldehyd in 4,0 ml dH 2 O und mit 28 ul 1N KOH. Warm bis 65 ° C, um die Paraformaldehyd zu lösen und dann auf Eis lagern. </li><li> Fixativ 1. Bereiten Sie eine frische Lösung von 0,5 ml 10X PBS, 50 ul Triton X-100, 3,45 ml dH 2 O und 1,0 ml von einem 5fach-Formaldehyd-Lager. Warm, die Triton X-100 verteilen und innerhalb von 1 Stunde. </li><li> Fixativ 2. Bereiten Sie eine frische Lösung von 1,5 ml dH 2 O, 2,5 ml Eisessig und 1,0 ml von einem 5fach-Formaldehyd-Lager und innerhalb von 1 Stunde. </li><li> Lactoacetic saurer Lösung. Bereiten Sie eine Lösung aus 1 ml Milchsäure, 2 ml dH 2 O und 3 ml Essigsäure. </li></ol> 4. Polytäne Chromosom Squash Zubereitung: <ol><li> Spülen Larven mit Wasser und Transfer zum PBS in einem Gewebe Kulturschale für die Präparation. </li><li> Fassen Sie die Spitze des Mundhaken mit einer Pinzette, halten den Körper zu 2 / 3 des Weges nach unten mit dem anderen Paar, und ziehen auf den Mund Haken, so dass die Speicheldrüsen ausgesetzt sind. Trennen Sie die Speicheldrüsen aus dem Gehirn und Auge-Fühlerglied Discs und sezieren das Fett Körper und alle anderen damit verbundenen Gewebe aus den Drüsen. </li><li> Add 200 Mikroliter Fixativ 1 mit dem ersten und einer zwei gut Depression schieben und 200-300 Mikroliter Fixativ 2 bis gut zwei. Transfer ein Paar Speicheldrüsen zu einer Zeit, zu Fixativ 1 in gut ein und inkubieren für die Menge an Zeit für die Ziel-Epitop erforderlich, in der Regel ca. 1-2 Minuten. (Hinweis: Einige Epitope, wie für die meisten der Histon-Modifikationen, kann 5 Minuten oder länger Fixierung erforderlich ist.) </li><li> Mit einer Pinzette Übertragung der Speicheldrüsen zu Fixativ 2 in gut 2 und inkubieren für zwei Minuten. </li><li> Übertragen Sie die Drüsen auf 10-30 ul Lactoacetic saurer Lösung auf eine saubere Sigmacoted Deckglas. Senken Sie einen Polylysin-beschichteten Objektträger auf das Deckglas und ohne Anwendung vertikaler Druck, nehmen Sie den Deckglas so die Drüsen zwischen dem Schieber und dem Deckglas werden. Sofort erleichtern Zelllyse und chromosomalen Ausbreitung durch vorsichtiges Greifen des Deckglas mit einer Pinzette an einer Kante und sanft bewegt es leicht hin und her und versucht, alle vertikalen Druck auf das Gewebe zu minimieren. Alternativ können Sie den Radiergummi Seite eines Bleistifts oder sogar eine Fingerspitze sanft bewegen das Deckglas hin und her. Beachten Sie, dass jede Verzögerung bei der Bewegung des Deckglas hin und her wahrscheinlich verschwinden Verbreitung der chromosomalen Arme, als sie dazu neigen wird, um sehr viel strenger bei der Belichtung mit der Lactoacetic saure Lösung. Trübung der Lösung ist oft ein guter Indikator für die Zellseparation. Leichtes Antippen des Deckglases schräg (zum vertikalen Druck zu vermeiden) mit dem Radiergummi Seite eines Bleistifts ein paar Mal kann auch helfen, in chromosomale verbreiten. </li><li> Unmittelbar untersuchen das Gewebe unter einem Phasenkontrast-Mikroskop mit einer 20 oder 40X-Objektiv, um festzustellen, ob die Chromosomen gut verteilt sind. </li><li> Wenn der chromosomalen Ausbreitung ausreichend ist, stellen Sie die Folie mit dem Deckglas nach unten auf einen Stapel von sauberen Kim-wischt. Legen Sie einen zweiten auf Kim-Wisch-und platt-Chromosomen, indem Sie Ihren Daumen über dem Deckglas positioniert ist und die Taste fest und vermeiden Sie jede horizontale Bewegung des Deckglases das würde Scherungder Chromosomen. </li><li> Untersuchen Sie die Folie wieder unter dem Mikroskop zu bestimmen, ob das Präparat eignet sich für den vorgesehenen Zweck. Wenn Chromosomen deutlich auf Quetschen verschoben haben, verbrauchen weniger Volumen von Lactoacetic-Lösung in Ihrem anschließenden Vorbereitungen. Wiederholen Sie die Schritte 4,1-4,8, bis eine ausreichende Anzahl von geeigneten Folien erhalten worden sind. Legen Sie 175 g Gewichte auf das Deckglas des Dias. </li><li> Füllen Sie einen kleinen Dewar (zB Thermoskanne) mit flüssigem Stickstoff. Mit einer langen Zange, dip Abgleiten in flüssigem N 2, bis das Kochen aufhört, entfernen Sie schieben und sofort nutzen Rande einer sauberen Rasierklinge an einer Ecke zu drehen, das Deckglas. Ist der Verschluss sofort verwendet werden soll, in einem Coplin Glas mit PBS bei 4 ° C. Ansonsten sammeln die Folie in eine Coplin-Gefäß mit 95% igem Ethanol gefüllt. Untersuchen Sie das Deckglas, sobald der Frost weg, um zu bestätigen, dass das Gewebe um die Folie aufgeklebt und nicht mit dem Deckglas bleiben sublimiert. Wiederholen Sie mit dem Rest der Folien bis alle Objektträger entweder in PBS (für den Einsatz innerhalb von wenigen Stunden) oder Ethanol (für längere Lagerung) gespeichert werden. </li></ol> Repräsentative Ergebnisse Der erste wichtige Schritt für den Erhalt von qualitativ hochwertigen polytänen Squash Vorbereitung ist, um Fett Larven mit großen Speicheldrüse Kerne wachsen. Die zweite ist eine gute Technik mit der Verbreitung Verfahren, das etwas Übung können. Ein Tipp für bessere Verbreitung Erfolges ist, den minimalen Volumen von lactoacetic saurer Lösung während der Quetschung Schritt zu finden. Dies fördert ausreichender Spreizung der Chromosomen, ohne dass übermäßige Streaming Kräfte, die Chromosom Arme reinigen können weg. Es ist auch erwähnenswert, dass jede Verzögerung bei der Bewegung des Deckglas hin und her verringert die Verbreitung der chromosomalen Arme, als sie eine höhere Steifigkeit werden, wenn die Lactoacetic saurer Lösung ausgesetzt. Wenn alles gut geht, sollte es zahlreiche gut verteilt Polytänchromosomen werden. Abbildung 1 zeigt ein Beispiel für eine solche Vorbereitung, Doppelzimmer mit einem Marker für Interband Regionen in grün und mit einem Farbstoff markiert, die Flecken der gebänderten Regionen in blau. Wenn nicht genügend verbreitet ist erhalten, werden die Chromosomen wie kleine Kugeln, wie in Abbildung 2 dargestellt aussehen. Auf der anderen Seite, wenn zu viel verbreitet aufgetreten ist, wird die chomosomes zu dünn und verlängert oder in einigen Fällen in kleine Stücke zersplittert wie in Abbildung 3 dargestellt. <img src="/files/ftp_upload/1748/1748fig1.jpg" alt="Abbildung 1" /> Abbildung 1. Polytäne Squash Vorbereitung Doppelzimmer mit Antikörpern gegen die JIL-1 Histon H3S10-Kinase (in rot) und Hoechst (blau) markiert. <img src="/files/ftp_upload/1748/1748fig2.jpg" alt="Abbildung 2" /> Abbildung 2. Polytäne Squash mit unzureichender Verbreitung. <img src="/files/ftp_upload/1748/1748fig3.jpg" alt="Abbildung 3" /> Abbildung 3. Polytäne Squash mit zu viel verbreitet.

<ol>
	<li>Cai, W., Bao, X., Deng, H., Jin, Y., Girton, J., Johansen, J., Johansen, K. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=RNA+polymerase+II-mediated+transcription+at+active+loci+does+not+require+histone+H3S10+phosphorylation+in+Drosophila.">RNA polymerase II-mediated transcription at active loci does not require histone H3S10 phosphorylation in Drosophila.</a> Development. 135, 2917-2925 (2008).</li><li>DiMario, P., Rosby, R., Cui, Z. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Direct+visualization+of+GFP-fusion+proteins+on+polytene+chromosomes.">Direct visualization of GFP-fusion proteins on polytene chromosomes.</a> Dros. Inf. Serv. 89, 115-118 (2006).</li><li>Johansen, K. M., Cai, W., Deng, H., Bao, X., Zhang, W., Girton, J., Johansen, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Methods+for+studying+transcription+and+epigenetic+chromatin+modification+in+Drosophila+polytene+chromosome+squash+preparations+using+antibodies.">Methods for studying transcription and epigenetic chromatin modification in Drosophila polytene chromosome squash preparations using antibodies.</a> Methods. 48, 387-397 (2009).</li></ol>

Die Aufnahme von Essig-und Milchsäure in konventionellen Squash Fixierung Protokolle erleichtert sowohl Interband Auflösung und chromosomalen Arm ausbreitet, aber leider auch einige Epitope nicht überleben diese Behandlung. Ein Beispiel für solch ein Epitop ist H3S10ph (Cai et al., 2008). Da Säurebehandlung hat auch den Nachteil, dass sie die Eigenfluoreszenz von GFP-markierten Proteine, DiMario et al stillt. (2006) kürzlich eine Formaldehyd-based &quot;säurefrei Squash-Technik&quot;, die für d...

preparation of drosophila polytene chromosome squashes for antibody labeling

Drosophila ist seit langem ein beliebtes Modellsystem für die Erforschung der Beziehung zwischen Chromatinstruktur und Genregulation durch die zytologische Vorteile durch die riesigen Speicheldrüse Polytänchromosomen des dritten Larvenstadium zur Verfügung gestellt worden. In diesem Gewebe die Chromosomen durchlaufen viele Runden der Replikation in Abwesenheit der Zellteilung, die zu etwa 1000 Exemplaren. Die DNA ausgerichtet bleibt nach jedem replikativen Zyklus resultierende stark vergrößert Chromosomen, die eine einzigartige Gelegenheit, Chromatin Morphologie mit der Lokalisierung von spezifischen Proteinen korreliert sind. Folglich hat es ein hohes Maß an Interesse an der Festlegung der epigenetischen Modifikationen derzeit an verschiedenen Genen und in den verschiedenen Phasen der Transkription Prozess. Ein wichtiges Instrument für solche Untersuchungen ist die Kennzeichnung von Polytänchromosomen mit Antikörpern gegen das Enzym, Transkriptionsfaktor, oder Histon-Modifikation von Interesse. Dieses Video-Protokoll zeigt die Squash-Technik in der Johansen Labor verwendet werden, um Drosophila Polytänchromosomen für Antikörpermarkierung vorzubereiten.

Watch this Scientific Journal Video about Preparation of Drosophila Polytene Chromosome Squashes for Antibody Labeling at JoVE.com

Preparation of Drosophila Polytene Chromosome Squashes for Antibody Labeling

Dieses Video-Protokoll zeigt die Squash-Technik in der Johansen-Labor dient zur Vorbereitung<em&gt; Drosophila</em&gt; Polytänchromosomen für Antikörpermarkierung.

Vorbereitung von Drosophila Polytäne Chromosome Kürbisse für Antikörpermarkierung

Drosophila has long been a favorite model system for studying the relationship between chromatin structure and gene regulation due to the cytological ...

preparation-drosophila-polytene-chromosome-squashes-for-antibody

Research

JoVE Journal

Biology

31.0K Aufrufe.  Iowa State University. Dieses Video-Protokoll zeigt die Squash-Technik in der Johansen-Labor dient zur Vorbereitung Drosophila Polytänchromosomen für Antikörpermarkierung.

Serie: Preparation of Drosophila Polytene Chromosome Squashes for Antibody Labeling

Preparation of Neuronal Cultures from Midgastrula Stage Drosophila Embryos

This video illustrates the procedure for making primary neuronal cultures from midgastrula stage Drosophila embryos. The methods for collecting embryos and their dechorionation using bleach are demonstrated. Using a glass pipet attached to a mouth suction tube, we illustrate the removal of all cells from single embryos. The method for dispersing cells from each embyro into a small (5 l) drop of medium on an uncoated glass coverslip is demonstrated. A view through the microscope at 1 hour after plating illustrates the preferred cell density. Most of the cells that survive when grown in defined medium are neuroblasts that divide one or more times in culture before extending neuritic processes by 12-24 hours. A view through the microscope illustrates the level of neurite outgrowth and branching expected in a healthy culture at 2 days in vitro. The cultures are grown in a simple bicarbonate based defined medium, in a 5% CO2 incubator at 22-24&deg;C. Neuritic processes continue to elaborate over the first week in culture and when they make contact with neurites from neighboring cells they often form functional synaptic connections. Neurons in these cultures express voltage-gated sodium, calcium, and potassium channels and are electrically excitable. This culture system is useful for studying molecular genetic and environmental factors that regulate neuronal differentiation, excitability, and synapse formation/function.

This video demonstrates the preparation of primary neuronal cultures from midgastrula stage Drosophila embryos. Views of live cultures show cells 1 hour after plating and differentiated neurons after 2 days of growth in a bicarbonate-based defined medium. The neurons are electrically excitable and form synaptic connections.

Vorbereitung der neuronalen Kulturen aus Midgastrula Bühne Drosophila Embryonen

This video illustrates the procedure for making primary neuronal cultures from midgastrula stage Drosophila embryos. The methods for collecting embryos ...

Forschung

Biologie

The Preparation of Drosophila Embryos for Live-Imaging Using the Hanging Drop Protocol

Green fluorescent protein (GFP)-based timelapse live-imaging is a powerful technique for studying the genetic regulation of dynamic processes such as tissue morphogenesis, cell-cell adhesion, or cell death. Drosophila embryos expressing GFP are readily imaged using either stereoscopic or confocal microscopy. A goal of any live-imaging protocol is to minimize detrimental effects such as dehydration and hypoxia. Previous protocols for preparing Drosophila embryos for live-imaging analysis have involved placing dechorionated embryos in halocarbon oil and sandwiching them between a halocarbon gas-permeable membrane and a coverslip1-3. The introduction of compression through mounting embryos in this manner represents an undesirable complication for any biomechanical-based analysis of morphogenesis. Our method, which we call the hanging drop protocol, results in excellent viability of embryos during live imaging and does not require that embryos be compressed. Briefly, the hanging drop protocol involves the placement of embryos in a drop of halocarbon oil that is suspended from a coverslip, which is, in turn, fixed in position over a humid chamber. In addition to providing gas exchange and preventing dehydration, this arrangement takes advantage of the buoyancy of embryos in halocarbon oil to prevent them from drifting out of position during timelapse acquisition. This video describes in detail how to collect and prepare Drosophila embryos for live imaging using the hanging drop protocol. This protocol is suitable for imaging dechorionated embryos using stereomicroscopy or any upright compound fluorescence microscope.

The Preparation of Drosophila Embryos for Live-Imaging Using the Hanging Drop Protocol

A simple, inexpensive, and effective method of preparing Drosophila embryos for live-imaging analysis is presented. Our protocol provides humidity and gas exchange and does not compress the Drosophila embryo. This method is suitable for GFP-based live imaging of Drosophila embryos using a stereomicroscope or upright compound microscope.

Die Herstellung Drosophila Embryonen für Live-Imaging mit dem Hanging-Drop-Protokoll

Green fluorescent protein (GFP)-based timelapse live-imaging is a powerful technique for studying the genetic regulation of dynamic processes such as ...

Fluorescent Labeling of Drosophila Heart Structures

The Drosophila melanogaster dorsal vessel, or heart, is a tubular structure comprised of a single layer of contractile cardiomyocytes, pericardial cells that align along each side of the heart wall, supportive alary muscles and, in adults, a layer of ventral longitudinal muscle cells. The contractile fibers house conserved constituents of the muscle cytoarchitecture including densely packed bundles of myofibrils and cytoskeletal/submembranous protein complexes, which interact with homologous components of the extracellular matrix. Here we describe a protocol for the fixation and the fluorescent labeling of particular myocardial elements from the hearts of dissected larvae and semi-intact adult Drosophila. Specifically, we demonstrate the labeling of sarcomeric F-actin and of &alpha;-actinin in larval hearts. Additionally, we perform labeling of F-actin and &alpha;-actinin in myosin-GFP expressing adult flies and of &alpha;-actinin and pericardin, a type IV extracellular matrix collagen, in wild type adult hearts. Particular attention is given to a mounting strategy for semi-intact adult hearts that minimizes handling and optimizes the opportunity for maintaining the integrity of the cardiac tubes and the associated tissues. These preparations are suitable for imaging via fluorescent and confocal microscopy. Overall, this procedure allows for careful and detailed analysis of the structural characteristics of the heart from a powerful genetically tractable model system.

Fluorescent Labeling of Drosophila Heart Structures

Here we describe a basic protocol for fluorescent labeling of different elements of heart tubes from larva and adult Drosophila melanogaster. These specimens are well-suited for imaging via fluorescent or confocal microscopy. This technique permits detailed structural analysis of the features of the hearts from a powerful model organism.

Fluoreszenzmarkierung Drosophila Herz Structures

The Drosophila melanogaster dorsal vessel, or heart, is a tubular structure comprised of a single layer of contractile cardiomyocytes, pericardial cells ...

Preparation of embryos for Electron Microscopy of the Drosophila embryonic heart tube

The morphogenesis of the Drosophila embryonic heart tube has emerged as a valuable model system for studying cell migration, cell-cell adhesion and cell shape changes during embryonic development. One of the challenges faced in studying this structure is that the lumen of the heart tube, as well as the membrane features that are crucial to heart tube formation, are difficult to visualize in whole mount embryos, due to the small size of the heart tube and intra-lumenal space relative to the embryo. The use of transmission electron microscopy allows for higher magnification of these structures and gives the advantage of examining the embryos in cross section, which easily reveals the size and shape of the lumen. In this video, we detail the process for reliable fixation, embedding, and sectioning of late stage Drosophila embryos in order to visualize the heart tube lumen as well as important cellular structures including cell-cell junctions and the basement membrane.

Preparation of embryos for Electron Microscopy of the Drosophila embryonic heart tube

We describe a process for fixation, embedding, sectioning, and imaging of late stage Drosophila embryos for Trasmission Electron Microscopy of the embryonic heart tube. This technique allows for the visualization of the heart tube lumen as well as the basement membrane, which lines the lumen of the heart.

Vorbereitung der Embryonen für Elektronenmikroskopie der Drosophila Embryonale Herz Rohr

The morphogenesis of the Drosophila  embryonic heart tube has emerged as a valuable model system for studying cell migration, cell-cell adhesion and cell ...

Live Dissection of Drosophila Embryos: Streamlined Methods for Screening Mutant Collections by Antibody Staining

Drosophila embryos between stages 14 and 17 of embryonic development can be readily dissected to generate "fillet" preparations. In these preparations, the central nervous system runs down the middle, and is flanked by the body walls. Many different phenotypes have been examined using such preparations. In most cases, the fillets were generated by dissection of antibody-stained fixed whole-mount embryos. These "fixed dissections" have some disadvantages, however. They are time-consuming to execute, and it is difficult to sort mutant (GFP-negative) embryos from stocks in which mutations are maintained over GFP balancer chromosomes. Since 2002, our group has been conducting deficiency and ectopic expression screens to identify ligands for orphan receptors. In order to do this, we developed streamlined protocols for live embryo dissection and antibody staining of collections containing hundreds of balanced lines. We have concluded that it is considerably more efficient to examine phenotypes in large collections of stocks by live dissection than by fixed dissection. Using the protocol described here, a single trained individual can screen up to 10 lines per day for phenotypes, examining 4-7 mutant embryos from each line under a compound microscope. This allows the identification of mutations conferring subtle, low-penetrance phenotypes, since up to 70 hemisegments per line are scored at high magnification with a 40X water-immersion lens.

Live Dissection of Drosophila Embryos: Streamlined Methods for Screening Mutant Collections by Antibody Staining

We describe a streamlined protocol for generating "fillet" preparations of Drosophila embryos of specific genotypes. This protocol allows efficient execution of a variety of genetic screens. It also allows excellent visualization of structures in the late embryo.

Live-Präparation Drosophila Embryos: Optimierte Verfahren für das Screening Mutant Sammlungen von Antikörper-Färbung

Drosophila embryos between stages 14 and 17 of embryonic development can be readily dissected to generate "fillet" preparations.  In these preparations, ...

Preparation of Developing and Adult Drosophila Brains and Retinae for Live Imaging

The Drosophila brain and visual system are widely utilized model systems to study neuronal development, function and degeneration. Here we show three preparations of the brain and visual system that cover the range from the developing eye disc-brain complex in the developing pupae to individual eye and brain dissection from adult flies. All protocols are optimized for the live culture of the preparations. However, we also present the conditions for fixed tissue immunohistochemistry where applicable. Finally, we show live imaging conditions for these preparations using conventional and resonant 4D confocal live imaging in a perfusion chamber. Together, these protocols provide a basis for live imaging on different time scales ranging from functional intracellular assays on the scale of minutes to developmental or degenerative processes on the scale of many hours.

Preparation of Developing and Adult Drosophila Brains and Retinae for Live Imaging

This protocol describes three Drosophila preparations: 1) adult brain dissection, 2) adult retina dissection and 3) developing eye disc- brain complexes dissection. Emphasis is laid on special preparation techniques and conditions for live imaging, although all preparations can be used for fixed tissue immunohistochemistry.

Erstellung von Entwicklungs-und Adult Drosophila Brains und retinae für Live Imaging

The Drosophila brain and visual system are widely utilized model systems to study neuronal development, function and degeneration. Here we show three ...

Preparation of Drosophila S2 cells for Light Microscopy

The ideal experimental system would be cheap and easy to maintain, amenable to a variety of techniques, and would be supported by an extensive literature and genome sequence database. Cultured Drosophila S2 cells, the product of disassociated 20-24 hour old embryos1, possess all these properties. Consequently, S2 cells are extremely well-suited for the analysis of cellular processes, including the discovery of the genes encoding the molecular components of the process or mechanism of interest. The features of S2 cells that are most responsible for their utility are the ease with which they are maintained, their exquisite sensitivity to double-stranded (ds)RNA-mediated interference (RNAi), and their tractability to fluorescence microscopy as either live or fixed cells.
S2 cells can be grown in a variety of media, including a number of inexpensive, commercially-available, fully-defined, serum-free media2. In addition, they grow optimally and quickly at 21-24&deg;C and can be cultured in a variety of containers. Unlike mammalian cells, S2 cells do not require a regulated atmosphere, but instead do well with normal air and can even be maintained in sealed flasks.
Complementing the ease of RNAi in S2 cells is the ability to readily analyze experimentally-induced phenotypes by phase or fluorescence microscopy of fixed or live cells. S2 cells grow in culture as a single monolayer but do not display contact inhibition. Instead, cells tend to grow in colonies in dense cultures. At low density, S2 cultures grown on glass or tissue culture-treated plastic are round and loosely-attached. However, the cytology of S2 cells can be greatly improved by inducing them to flatten extensively by briefly culturing them on a surface coated with the lectin, concanavalin A (ConA)3. S2 cells can also be stably transfected with fluorescently-tagged markers to label structures or organelles of interest in live or fixed cells. Therefore, the usual scenario for the microscopic analysis of cells is this: first, S2 cells (which can possess transgenes to express tagged markers) are treated by RNAi to eliminate a target protein(s). RNAi treatment time can be adjusted to allow for differences in protein turn-over kinetics and to minimize cell trauma/death if the target protein is important for viability. Next, the treated cells are transferred to a dish containing a coverslip pre-coated with conA to induce cells to spread and tightly adhere to the glass. Finally, cells are imaged with the researcher's choice of microscopy modes. S2 cells are particularly good for studies requiring extended visualization of live cells since these cells stay healthy at room temperature and normal atmosphere.

Preparation of Drosophila S2 cells for Light Microscopy

Drosophila Schneider (S2) cells are an increasingly popular system for the discovery and functional analysis of genes. Our goal is to describe some of the microscopic techniques that make S2 cells such an increasingly important experimental system.

Vorbereitung der Drosophila S2-Zellen für Lichtmikroskopie

The ideal experimental system would be cheap and easy to maintain, amenable to a variety of techniques, and would be supported by an extensive literature ...

Associated Chromosome Trap for Identifying Long-range DNA Interactions

Genetic information encoded by DNA is organized in a complex and highly regulated chromatin structure. Each chromosome occupies a specific territory, that may change according to stage of development or cell cycle. Gene expression can occur in specialized transcriptional factories where chromatin segments may loop out from various chromosome territories, leading to co-localization of DNA segments which may exist on different chromosomes or far apart on the same chromosome. The Associated Chromosome Trap (ACT) assay provides an effective methodology to identify these long-range DNA associations in an unbiased fashion by extending and modifying the chromosome conformation capture technique. The ACT assay makes it possible for us to investigate mechanisms of transcriptional regulation in trans, and can help explain the relationship of nuclear architecture to gene expression in normal physiology and during disease states.

The associated chromosome trap (ACT) assay is a novel unbiased method for identifying long-range DNA interactions. The characterization of long range DNA interactions will allow us to determine the relationship of nuclear architecture to gene expression in both normal physiology and in diseased states.

Assoziierte Chromosome-Trap zur Identifizierung weiträumige DNA-Wechselwirkungen

Genetic information encoded by DNA is organized in a complex and highly regulated chromatin structure.  Each chromosome occupies a specific territory, ...

Preparation of Adult Drosophila Eyes for Thin Sectioning and Microscopic Analysis

Drosophila has long been used as model system to study development, mainly due to the ease with which it is genetically tractable. Over the years, a plethora of mutant strains and technical tricks have been developed to allow sophisticated questions to be asked and answered in a reasonable amount of time. Fundamental insight into the interplay of components of all known major signaling pathways has been obtained in forward and reverse genetic Drosophila studies. The fly eye has proven to be exceptionally well suited for mutational analysis, since, under laboratory conditions, flies can survive without functional eyes. Furthermore, the surface of the insect eye is composed of some 800 individual unit eyes (facets or ommatidia) that form a regular, smooth surface when looked at under a dissecting microscope. Thus, it is easy to see whether a mutation might affect eye development or growth by externally looking for the loss of the smooth surface ('rough eye' phenotype; Fig. 1) or overall eye size, respectively (for examples of screens based on external eye morphology see e.g.1). Subsequent detailed analyses of eye phenotypes require fixation, plastic embedding and thin-sectioning of adult eyes.
The Drosophila eye develops from the so-called eye imaginal disc, a bag of epithelial cells that proliferate and differentiate during larval and pupal stages (for review see e.g. 2). Each ommatidium consists of 20 cells, including eight photoreceptors (PR or R-cells; Fig. 2), four lens-secreting cone cells, pigment cells ('hexagon' around R-cell cluster) and a bristle. The photoreceptors of each ommatidium, most easily identified by their light sensitive organelles, the rhabdomeres, are organized in a trapezoid made up of the six "outer" (R1-6) and two "inner" photoreceptors (R7/8; R8 [Fig. 2] is underneath R7 and thus only seen in sections from deeper areas of the eye). The trapezoid of each facet is precisely aligned with those of its neighbors and the overall anteroposterior and dorsoventral axes of the eye (Fig. 3A). In particular, the ommatidia of the dorsal and ventral (black and red arrows, respectively) halves of the eye are mirror images of each other and correspond to two chiral forms established during planar cell polarity signaling (for review see e.g. 3).
The method to generate semi-thin eye sections (such as those presented in Fig. 3) described here is slightly modified from the one originally described by Tomlinson and Ready4. It allows the morphological analysis of all cells except for the transparent cone cells. In addition, the pigment of R-cells (blue arrowheads in Fig. 2 and 3) can be used as a cell-autonomous marker for the genotype of a R-cell, thus genetic requirements of genes in a subset of R-cells can readily be determined5,6.

Preparation of Adult Drosophila Eyes for Thin Sectioning and Microscopic Analysis

A standard approach to prepare adult Drosophila eyes for semi-thin sectioning and light microscopic analysis is presented here. The protocol can be used for gross morphological analysis of eye defects, or with the indicated adjustments can be used to determine genetic requirements of genes in specific cell types of the eye (e.g. clonal analysis of photoreceptors) or for electron microscopic analysis.

Vorbereitung von Adult Drosophila Augen für Thin Schnitte und mikroskopische Untersuchung

Drosophila has long been used as model system to study development, mainly due to the ease with which it is genetically tractable. Over the years, a ...

Studying Mitotic Checkpoint by Illustrating Dynamic Kinetochore Protein Behavior and Chromosome Motion in Living Drosophila Syncytial Embryos

The spindle assembly checkpoint (SAC) mechanism is an active signal, which monitors the interaction between chromosome kinetochores and spindle microtubules to prevent anaphase onset until the chromosomes are properly connected. Cells use this mechanism to prevent aneuploidy or genomic instability, and hence cancers and other human diseases like birth defects and Alzheimer's1. A number of the SAC components such as Mad1, Mad2, Bub1, BubR1, Bub3, Mps1, Zw10, Rod and Aurora B kinase have been identified and they are all kinetochore dynamic proteins2. Evidence suggests that the kinetochore is where the SAC signal is initiated. The SAC prime regulatory target is Cdc20. Cdc20 is one of the essential APC/C (Anaphase Promoting Complex or Cyclosome) activators3 and is also a kinetochore dynamic protein4-6. When activated, the SAC inhibits the activity of the APC/C to prevent the destruction of two key substrates, cyclin B and securin, thereby preventing the metaphase to anaphase transition7,8. Exactly how the SAC signal is initiated and assembled on the kinetochores and relayed onto the APC/C to inhibit its function still remains elusive.
Drosophila is an extremely tractable experimental system; a much simpler and better-understood organism compared to the human but one that shares fundamental processes in common. It is, perhaps, one of the best organisms to use for bio-imaging studies in living cells, especially for visualization of the mitotic events in space and time, as the early embryo goes through 13 rapid nuclear division cycles synchronously (8-10 minutes for each cycle at 25 &deg;C) and gradually organizes the nuclei in a single monolayer just underneath the cortex9.
Here, I present a bio-imaging method using transgenic Drosophila expressing GFP (Green Fluorescent Protein) or its variant-targeted proteins of interest and a Leica TCS SP2 confocal laser scanning microscope system to study the SAC function in flies, by showing images of GFP fusion proteins of some of the SAC components, Cdc20 and Mad2, as the example.

Studying Mitotic Checkpoint by Illustrating Dynamic Kinetochore Protein Behavior and Chromosome Motion in Living Drosophila Syncytial Embryos

The kinetochore is where the SAC initiates its signal monitoring the mitotic segregation of the sister chromatids. A method is described to visualize the recruitment and turnover of one of the kinetochore proteins and its coordination with the chromosome motion in Drosophila embryos using a Leica laser scanning confocal system.

Studieren mitotischen Checkpoint durch Veranschaulichung Dynamische Kinetochor Protein Verhalten und Chromosome Motion in Lebens-<em&gt; Drosophila</em&gt; Syncytial Embryonen