Name: measurement of lifespan in drosophila melanogaster
Uploaded: 2013-01-07T13:00:00
Description: Watch this Scientific Journal Video about Measurement of Lifespan in Drosophila melanogaster at JoVE.com

Ce travail a été soutenu par un financement de la Fondation Ellison Medical (SDP, <a href="http://www.ellisonfoundation.org/index.jsp" target="_blank">http://www.ellisonfoundation.org/index.jsp</a> ), NIH K01AG031917 (NJL, <a href="http://www.nih.gov" target="_blank">http://www.nih.gov/</a> ), NIH 5T32GM007315-35 (JR) et le NIH R01AG030593 (SDP). Ce travail a utilisé les ressources de la base Drosophila vieillissement (CAD) de l&#39;amortisseur Nathan Centre d&#39;excellence en biologie du vieillissement financée par le National Institute of Aging P30-AG-013283 ( <a href="http://www.nih.gov" target="_blank">http://www.nih.gov/</a> ). Les auteurs tiennent à remercier le Laboratoire Pletcher pour des discussions utiles et notamment Brian Chung pour la lecture critique du manuscrit. Nous tenons à remercier Nick Asher et Kathryn Borowicz de l&#39;aide pour la collecte de données.

Nous vous recommandons de conserver des aliments expérimentaux, la pâte de levure, et des plaques de gélose de raisin qui apparaissent dans le protocole à 4 ° C et les utiliser dans les 1-2 mois aussi longtemps que la moisissure et la sécheresse n&#39;ont pas mis po standard des conditions environnementales à la fois pour les larves et les adultes scène impliquent l&#39;entretien des mouches dans un incubateur à 25 ° C avec un cycle de lumière 12:12 h sombre et 60% d&#39;humidité relative. <p class="jove...

<ol>
	<li>Toivonen, J. M., 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=No+influence+of+Indy+on+lifespan+in+Drosophila+after+correction+for+genetic+and+cytoplasmic+background+effects.">No influence of Indy on lifespan in Drosophila after correction for genetic and cytoplasmic background effects.</a> PLoS Genet. 3, e95 (2007).</li><li>Spencer, C. C., Howell, C. E., Wright, A. R., Promislow, D. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Testing+an+'aging+gene'+in+long-lived+drosophila+strains:+increased+longevity+depends+on+sex+and+genetic+background.">Testing an 'aging gene' in long-lived drosophila strains: increased longevity depends on sex and genetic background.</a> Aging Cell. 2, 123-130 (2003).</li><li>Burnett, C., 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=Absence+of+effects+of+Sir2+overexpression+on+lifespan+in+C.+elegans+and+Drosophila.">Absence of effects of Sir2 overexpression on lifespan in C. elegans and Drosophila.</a> Nature. 477, 482-485 (2011).</li><li>Bokov, A. F., 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=Does+reduced+IGF-1R+signaling+in+Igf1r+/-+mice+alter+aging?.">Does reduced IGF-1R signaling in Igf1r+/- mice alter aging?.</a> PLoS One. 6, e26891 (2011).</li><li>Lewis, E. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+new+standard+food+medium.">A new standard food medium.</a> Drosophila Information Service. 34, 117-118 (1960).</li><li>Skorupa, D. A., Dervisefendic, A., Zwiener, J., Pletcher, S. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dietary+composition+specifies+consumption,+obesity,+and+lifespan+in+Drosophila+melanogaster.">Dietary composition specifies consumption, obesity, and lifespan in Drosophila melanogaster.</a> Aging Cell. 7, 478-490 (2008).</li><li>Rera, M., 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=Modulation+of+longevity+and+tissue+homeostasis+by+the+Drosophila+PGC-1+homolog.">Modulation of longevity and tissue homeostasis by the Drosophila PGC-1 homolog.</a> Cell Metab. 14, 623-634 (2011).</li><li>Kaplan, E. L., Meier, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Nonparametric+Estimation+from+Incomplete+Observations.">Nonparametric Estimation from Incomplete Observations.</a> Journal of the American Statistical Association. 53, 457-481 (1958).</li><li>Pletcher, S. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mitigating+the+Tithonus+Error:+Genetic+Analysis+of+Mortality+Phenotypes.">Mitigating the Tithonus Error: Genetic Analysis of Mortality Phenotypes.</a> Sci. Aging Knowl. Environ. 2002, pe14 (2002).</li><li>Pletcher, S. D., Khazaeli, A. A., Curtsinger, J. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Why+do+life+spans+differ?+Partitioning+mean+longevity+differences+in+terms+of+age-specific+mortality+parameters.">Why do life spans differ? Partitioning mean longevity differences in terms of age-specific mortality parameters.</a> J. Gerontol. A Biol. Sci. Med. Sci. 55, 381-389 (2000).</li><li>Promislow, , Tatar, , Pletcher, , Carey, <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Below-threshold+mortality:+implications+for+studies+in+evolution,+ecology+and+demography.">Below-threshold mortality: implications for studies in evolution, ecology and demography.</a> Journal of Evolutionary Biology. 12, 314-328 (1999).</li><li>Pletcher, <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Model+fitting+and+hypothesis+testing+for+age-specific+mortality+data.">Model fitting and hypothesis testing for age-specific mortality data.</a> Journal of Evolutionary Biology. 12, 430-439 (1999).</li><li>Partridge, L., Gems, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Benchmarks+for+ageing+studies.">Benchmarks for ageing studies.</a> Nature. 450, 165-167 (2007).</li><li>Roman, G., Endo, K., Zong, L., Davis, R. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=P[Switch],+a+system+for+spatial+and+temporal+control+of+gene+expression+in+Drosophila+melanogaster.">P[Switch], a system for spatial and temporal control of gene expression in Drosophila melanogaster.</a> Proceedings of the National Academy of Sciences of the United States of America. 98, 12602-12607 (2001).</li><li>Ford, D., 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=Alteration+of+Drosophila+life+span+using+conditional,+tissue-specific+expression+of+transgenes+triggered+by+doxycyline+or+RU486/Mifepristone.">Alteration of Drosophila life span using conditional, tissue-specific expression of transgenes triggered by doxycyline or RU486/Mifepristone.</a> Exp. Gerontol. 42, 483-497 (2007).</li><li>Priest, N. K., Mackowiak, B., Promislow, D. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+role+of+parental+age+effects+on+the+evolution+of+aging.">The role of parental age effects on the evolution of aging.</a> Evolution. 56, 927-935 (2002).</li><li>Smith, E. M., 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=Feeding+Drosophila+a+biotin-deficient+diet+for+multiple+generations+increases+stress+resistance+and+lifespan+and+alters+gene+expression+and+histone+biotinylation+patterns.">Feeding Drosophila a biotin-deficient diet for multiple generations increases stress resistance and lifespan and alters gene expression and histone biotinylation patterns.</a> J. Nutr. 137, 2006-2012 (2007).</li><li>Sorensen, J. G., Loeschcke, V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Larval+crowding+in+Drosophila+melanogaster+induces+Hsp70+expression,+and+leads+to+increased+adult+longevity+and+adult+thermal+stress+resistance.">Larval crowding in Drosophila melanogaster induces Hsp70 expression, and leads to increased adult longevity and adult thermal stress resistance.</a> J. Insect Physiol. 47, 1301-1307 (2001).</li><li>Bass, T. M., 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=Optimization+of+dietary+restriction+protocols+in+Drosophila.">Optimization of dietary restriction protocols in Drosophila.</a> J. Gerontol. A Biol. Sci. Med. Sci. 62, 1071-1081 (2007).</li><li>Miquel, J., Lundgren, P. R., Bensch, K. G., Atlan, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effects+of+temperature+on+the+life+span,+vitality+and+fine+structure+of+Drosophila+melanogaster.">Effects of temperature on the life span, vitality and fine structure of Drosophila melanogaster.</a> Mechanisms of Ageing and Development. 5, 347-370 (1976).</li><li>Pittendrigh, C. S., Minis, D. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Circadian+systems:+longevity+as+a+function+of+circadian+resonance+in+Drosophila+melanogaster.">Circadian systems: longevity as a function of circadian resonance in Drosophila melanogaster.</a> Proceedings of the National Academy of Sciences of the United States of America. 69, 1537-1539 (1972).</li><li>Joshi, A., Mueller, L. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Adult+crowding+effects+on+longevity+in+Drosophila+melanogaster:+Increase+in+age-dependent+mortality.">Adult crowding effects on longevity in Drosophila melanogaster: Increase in age-dependent mortality.</a> Current Science. 72, 255-260 (1997).</li><li>Ja, W. W., 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=Prandiology+of+Drosophila+and+the+CAFE+assay.">Prandiology of Drosophila and the CAFE assay.</a> Proceedings of the National Academy of Sciences of the United States of America. 104, 8253-8256 (2007).</li><li>Lee, K. P., 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=Lifespan+and+reproduction+in+Drosophila:+New+insights+from+nutritional+geometry.">Lifespan and reproduction in Drosophila: New insights from nutritional geometry.</a> Proceedings of the National Academy of Sciences of the United States of America. 105, 2498-2503 (2008).</li><li>Gargano, J. W., Martin, I., Bhandari, P., Grotewiel, M. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Rapid+iterative+negative+geotaxis+(RING):+a+new+method+for+assessing+age-related+locomotor+decline+in+Drosophila.">Rapid iterative negative geotaxis (RING): a new method for assessing age-related locomotor decline in Drosophila.</a> Experimental gerontology. 40, 386-395 (2005).</li></ol>

Le protocole présenté ici décrit une méthode pour produire des mesures reproductibles de la longévité des adultes chez la drosophile qui est adaptable pour l&#39;évaluation des ressources génétiques, des interventions pharmacologiques et environnementaux. Aspects cruciaux du protocole comprennent un contrôle minutieux de l&#39;environnement de développement larvaire, la réduction du stress des adultes, et minimiser les biais entre les groupes expérimentaux et de contrôle. Nous présentons égaleme...

<table border="1"><tbody><tr><td> Nom du réactif </td><td> Entreprise </td><td> Numéro de catalogue </td><td> Commentaires (optionnel) </td></tr><tr><td> De levure sèche active </td><td> Fleishmann levure </td><td> 2192 </td><td></td></tr><tr><td> Grape Premix Poudre Agar </td><td> Genesee scientifique </td><td> 47-102 </td><td></td></tr><tr><td> Grandes cages de collecte d&#39;embryons </td><td> Genesee scientifique </td><td> 59-101 </td><td></td></tr><tr><td> Embouts de rechange grandes </td><td> Genesee scientifique </td><td> 59-103 </td><td></td></tr><tr><td> 6 Bouteilles once fond carré, en polypropylène </td><td> Genesee scientifique </td><td> 32-130 </td><td></td></tr><tr><td> Fermetures pour Bouteilles flugs stock </td><td> Genesee scientifique </td><td> 49-100 </td><td></td></tr><tr><td> DrosophilaFlacons, large, polystyrène </td><td> Genesee scientifique </td><td> 32-117 </td><td></td></tr><tr><td> Fermetures pour flacons à large flugs </td><td> Genesee scientifique </td><td> 49-101 </td><td></td></tr><tr><td> Conseils de larges orifices Pipet Aardvark, 200 ul </td><td> Denville scientifique </td><td> P1105-CP </td><td></td></tr><tr><td> Flystuff Flypad, taille standard </td><td> Genesee scientifique </td><td> 59-114 </td><td></td></tr><tr><td> BD Falcon tubes de 15 ml à centrifuger coniques </td><td> Fisher Scientific </td><td> 14 à 959-70C </td><td></td></tr><tr><td> Fisherbrand boîtes de Pétri avec couvercles clairs, surélevée Ridge, 100 mm x 15 mm H; </td><td> Fisher Scientific </td><td> 08-757-12 </td><td></td></tr><tr><td> Kimax * Colorware flacons de 1000 ml jaune </td><td> Fisher Scientific </td><td> 10-200-47 </td><td></td></tr><tr><td> PBS pH 7,4 10x </td><td> EnVitrogen </td><td> 70011044 </td><td></td></tr><tr><td> Agar Gelidium </td><td> Mooragar </td><td> n / a </td><td></td></tr><tr><td> La levure de bière </td><td> MP Biomédical </td><td> 0290331280 </td><td></td></tr><tr><td> Sucre granulé </td><td> Kroger </td><td> n / a </td><td></td></tr><tr><td> Tegosept </td><td> Genesee scientifique </td><td> 20-266 </td><td> Fly Conservateur alimentaire </td></tr><tr><td> Acide propionique, 99% </td><td> Acros Organics </td><td> 149300025 </td><td> Fly Conservateur alimentaire </td></tr><tr><td> Le sulfate de kanamycine </td><td> ISC BioExpress </td><td> 0408-10G </td><td></td></tr><tr><td> Tétracycline HCl </td><td> VWR </td><td> 80058-724 </td><td></td></tr></tbody></table>

measurement of lifespan in drosophila melanogaster

Le vieillissement est un phénomène qui se traduit par une détérioration physiologique stable dans pratiquement tous les organismes dans lesquels il a été examiné, conduisant à des performances physiques réduites et un risque accru de la maladie. Vieillissement individuel est manifeste au niveau de la population comme une augmentation de la mortalité liée à l&#39;âge, ce qui est souvent mesurée en laboratoire en observant la durée de vie dans les grandes cohortes d&#39;individus appariés selon l&#39;âge. Les expériences qui cherchent à quantifier la mesure dans laquelle génétique ou l&#39;impact environnemental des manipulations durée de vie dans des organismes modèles simples ont connu un succès remarquable pour comprendre les aspects du vieillissement qui sont conservés entre les taxons et d&#39;inspirer de nouvelles stratégies pour étendre la durée de vie et la prévention des maladies liées à l&#39;âge chez les mammifères . La mouche du vinaigre, Drosophila melanogaster, est un organisme modèle intéressant pour l&#39;étude des mécanismes de vieillissement en raison de sa relativement courte durée de vie, l&#39;élevage pratique et la génétique faciles.Toutefois, les mesures démographiques du vieillissement, notamment l&#39;âge de la survie spécifique et la mortalité, sont extrêmement sensibles aux variations, même mineures dans la conception expérimentale et de l&#39;environnement, et le maintien de bonnes pratiques de laboratoire strictes pour la durée des expériences de vieillissement est nécessaire. Ces considérations, ainsi que de la nécessité de pratiquer un contrôle minutieux du contexte génétique, sont essentielles pour générer des mesures robustes. En effet, il existe de nombreuses controverses entourant notables inférence à partir des expériences de longévité chez la levure, les vers, les mouches et des souris qui ont été tracées à des artefacts environnementaux ou génétiques 1-4. Dans ce protocole, nous décrivons un ensemble de procédures qui ont été optimisés pendant de nombreuses années de mesure de la longévité chez la drosophile en utilisant des flacons de laboratoire. Nous décrivons également l&#39;utilisation du logiciel dLife, qui a été développé par notre laboratoire et est disponible en téléchargement ( <a href="http://sitemaker.umich.edu/pletcherlab/software">http://sitemaker.umich.edu/ple</a>tcherlab / logiciel). dLife accélère le débit et la promotion de bonnes pratiques en intégrant la conception expérimentale optimale, ce qui simplifie la manipulation mouche et la collecte de données, et en normalisant l&#39;analyse des données. Nous discuterons également les nombreux pièges potentiels dans la conception, la collecte et l&#39;interprétation des données de durée de vie, et nous fournissons des mesures pour éviter ces dangers.

Un schéma simplifié du protocole est présenté à la figure 1, où les étapes clés sont décrits. La partie de synchronisation du protocole peut être utilisé pour différents essais qui nécessitent mouches adultes appariés par l&#39;âge. Courbes de survie typiques de mouches de type sauvage sont présentés dans la figure 2a, en utilisant le logiciel de gestion dLife expérience (Figure 2b, c). Les mâles adultes vivent généralem...

Watch this Scientific Journal Video about Measurement of Lifespan in Drosophila melanogaster at JoVE.com

Measurement of Lifespan in Drosophila melanogaster

Drosophila melanogaster est un organisme modèle puissant pour explorer la base moléculaire de la régulation longévité. Ce protocole discuter des étapes à suivre pour générer un reproductible, basée sur la population de mesure de la longévité ainsi que les pièges potentiels et comment les éviter.

Mesure de la durée de vie en<em&gt; Drosophila melanogaster</em

Aging is a phenomenon that results in steady physiological deterioration in nearly all organisms in which it has been examined, leading to reduced ...

measurement-of-lifespan-in-drosophila-melanogaster

Research

JoVE Journal

Biology

Measurement of Lifespan in Drosophila melanogaster

Dissection of Larval CNS in Drosophila Melanogaster

The central nervous system (CNS) of Drosophila larvae is complex and poorly understood.  One way to investigate the CNS is to use immunohistochemistry to examine the expression of various novel and marker proteins.  Staining of whole larvae is impractical because the tough cuticle prevents antibodies from penetrating inside the body cavity.  In order to stain these tissues it is necessary to dissect the animal prior to fixing and staining.  In this article we demonstrate how to dissect Drosophila larvae without damaging the CNS.  Begin by tearing the larva in half with a pair of fine forceps, and then turn the cuticle "inside-out" to expose the CNS.  If the dissection is performed carefully the CNS will remain attached to the cuticle.  We usually keep the CNS attached to the cuticle throughout the fixation and staining steps, and only completely remove the CNS from the cuticle just prior to mounting the samples on glass slides.  We also show some representative images of a larval CNS stained with Eve, a transcription factor expressed in a subset of neurons in the CNS.  The article concludes with a discussion of some of the practical uses of this technique and the potential difficulties that may arise.

In this article we demonstrate how to dissect the central nervous system from third instar Drosophila larvae.

Dissection de SNC larvaire chez Drosophila melanogaster

The central nervous system (CNS) of Drosophila larvae is complex and poorly understood.  One way to investigate the CNS is to use immunohistochemistry to ...

Recherche

Biologie

High-Resolution Video Tracking of Locomotion in Adult Drosophila Melanogaster

Flies provide an important model for studying complex behavior due to the plethora of genetic tools available to researchers in this field. Studying locomotor behavior in Drosophila melanogaster relies on the ability to be able to quantify changes in motion during or in response to a given task. For this reason, a high-resolution video tracking system, such as the one we describe in this paper, is a valuable tool for measuring locomotion in real-time. Our protocol involves the use of an initial air pulse to break the flies momentum, followed by a thirty second filming period in a square chamber. A tracking program is then used to calculate the instantaneous speed of each fly within the chamber in 10 msec increments. Analysis software then compiles this data, and outputs a variety of parameters such as average speed, max speed, time spent in motion, acceleration, etc. This protocol will discuss proper feeding and management of flies for behavioral tasks, handling flies without anesthetization or immobilization, setting up a controlled environment, and running the assay from start to finish.

The study of complex locomotor behavior in Drosophila melanogaster is dependent upon the ability to quantify changes in a given fly's movement. This article demonstrates how to do this using a high-resolution tracking system.

Suivi vidéo haute résolution de la locomotion chez les adultes Drosophila melanogaster

Flies provide an important model for studying complex behavior due to the plethora of genetic tools available to researchers in this field.  Studying ...

Live Imaging Of Drosophila melanogaster Embryonic Hemocyte Migrations

Many studies address cell migration using in vitro methods, whereas the physiologically relevant environment is that of the organism itself. Here we present a protocol for the mounting of Drosophila melanogaster embryos and subsequent live imaging of fluorescently labeled hemocytes, the embryonic macrophages of this organism. Using the Gal4-uas system1 we drive the expression of a variety of genetically encoded, fluorescently tagged markers in hemocytes to follow their developmental dispersal throughout the embryo. Following collection of embryos at the desired stage of development, the outer chorion is removed and the embryos are then mounted in halocarbon oil between a hydrophobic, gas-permeable membrane and a glass coverslip for live imaging. In addition to gross migratory parameters such as speed and directionality, higher resolution imaging coupled with the use of fluorescent reporters of F-actin and microtubules can provide more detailed information concerning the dynamics of these cytoskeletal components.

Live Imaging Of Drosophila melanogaster Embryonic Hemocyte Migrations

Drosophila hemocytes disperse over the entirety of the developing embryo. This protocol demonstrates how to mount and image these migrations using embryos with fluorescently labelled hemocytes.

En direct de l&#39;imagerie Drosophila melanogaster Migrations hémocytaires embryonnaires

Many studies address cell migration using in vitro methods, whereas the physiologically relevant environment is that of the organism itself. Here we ...

Dissection of Oenocytes from Adult Drosophila melanogaster

In Drosophila melanogaster, as in other insects, a waxy layer on the outer surface of the cuticle, composed primarily of hydrocarbon compounds, provides protection against desiccation and other environmental challenges. Several of these cuticular hydrocarbon (CHC) compounds also function as semiochemical signals, and as such mediate pheromonal communications between members of the same species, or in some instances between different species, and influence behavior. Specialized cells referred to as oenocytes are regarded as the primary site for CHC synthesis. However, relatively little is known regarding the involvement of the oenocytes in the regulation of the biosynthetic, transport, and deposition pathways contributing to CHC output. Given the significant role that CHCs play in several aspects of insect biology, including chemical communication, desiccation resistance, and immunity, it is important to gain a greater understanding of the molecular and genetic regulation of CHC production within these specialized cells. The adult oenocytes of D. melanogaster are located within the abdominal integument, and are metamerically arrayed in ribbon-like clusters radiating along the inner cuticular surface of each abdominal segment. In this video article we demonstrate a dissection technique used for the preparation of oenocytes from adult D. melanogaster. Specifically, we provide a detailed step-by-step demonstration of (1) how to fillet prepare an adult Drosophila abdomen, (2) how to identify the oenocytes and discern them from other tissues, and (3) how to remove intact oenocyte clusters from the abdominal integument. A brief experimental illustration of how this preparation can be used to examine the expression of genes involved in hydrocarbon synthesis is included. The dissected preparation demonstrated herein will allow for the detailed molecular and genetic analysis of oenocyte function in the adult fruit fly.

Dissection of Oenocytes from Adult Drosophila melanogaster

In insects, the oenocytes produce cuticular hydrocarbon compounds. These compounds protect against desiccation and facilitate chemical communication. Here we demonstrate a dissection technique used to isolate the oenocytes from adult Drosophila melanogaster, and illustrate how this preparation can be utilized to study genes involved in hydrocarbon synthesis.

Dissection de Oenocytes d&#39;adultes Drosophila melanogaster</em

In Drosophila melanogaster, as in other insects, a waxy layer on the outer surface of the cuticle, composed primarily of hydrocarbon compounds, provides ...

Isolation of Drosophila melanogaster Testes

The testes of Drosophila melanogaster provide an important model for the study of stem cell maintenance and differentiation, meiosis, and soma-germline interactions. Testes are typically isolated from adult males 0-3 days after eclosion from the pupal case. The testes of wild-type flies are easily distinguished from other tissues because they are yellow, but the testes of white mutant flies, a common genetic background for laboratory experiments are similar in both shape and color to the fly gut. Performing dissection on a glass microscope slide with a black background makes identifying the testes considerably easier. Testes are removed from the flies using dissecting needles. Compared to protocols that use forceps for testes dissection, our method is far quicker, allowing a well-practiced individual to dissect testes from 200-300 wild-type flies per hour, yielding 400-600 testes. Testes from white flies or from mutants that reduce testes size are harder to dissect and typically yield 200-400 testes per hour.

Isolation of Drosophila melanogaster Testes

Drosophila melanogaster testes can be rapidly and efficiently isolated from adult males using dissecting needles. With practice, one can readily isolate in one or two days an amount of testes sufficient for the analysis of DNA or RNA by high throughput sequencing or more traditional molecular biology methods or of protein for antibody- or enzyme-based assays.

Isolement des Drosophila melanogaster Testicules

The testes of Drosophila melanogaster provide an important model for the study of stem cell maintenance and differentiation, meiosis, and soma-germline ...

Imaging Through the Pupal Case of Drosophila melanogaster

The longstanding use of Drosophila as a model for cell and developmental biology has yielded an array of tools. Together, these techniques have enabled analysis of cell and developmental biology from a variety of methodological angles. Live imaging is an emerging method for observing dynamic cell processes, such as cell division or cell motility. Having isolated mutations in uncharacterized putative cell cycle proteins it became essential to observe mitosis in situ using live imaging. Most live imaging studies in Drosophila have focused on the embryonic stages that are accessible to manipulation and observation because of their small size and optical clarity. However, in these stages the cell cycle is unusual in that it lacks one or both of the gap phases. By contrast, cells of the pupal wing of Drosophila have a typical cell cycle and undergo a period of rapid mitosis spanning about 20 hr of pupal development. It is easy to identify and isolate pupae of the appropriate stage to catch mitosis in situ. Mounting intact pupae provided the best combination of tractability and durability during imaging, allowing experiments to run for several hours with minimal impact on cell and animal viability. The method allows observation of features as small as, or smaller than, fly chromosomes. Adjustment of microscope settings and the details of mounting, allowed extension of the preparation to visualize membrane dynamics of adjacent cells and fluorescently labeled proteins such as tubulin. This method works for all tested fluorescent proteins and can capture submicron scale features over a variety of time scales. While limited to the outer 20 &#181;m of the pupa with a conventional confocal microscope, this approach to observing protein and cellular dynamics in pupal tissues in vivo may be generally useful in the study of cell and developmental biology in these tissues.

Imaging Through the Pupal Case of Drosophila melanogaster

This paper demonstrates the use of a fast scanning confocal microscope to image cell behavior directly through the puparium. By leaving the pupal case intact, this method allows observation and measurement of dynamic cell processes at a stage of Drosophila development that is difficult to study directly.

Imagerie à travers le cas de la nymphe<em&gt; Drosophila melanogaster</em

The longstanding use of Drosophila as a model for cell and developmental biology has yielded an array of tools. Together, these techniques have enabled ...

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.

Mesure des taux métabolique dans<em&gt; Drosophila</em&gt; En utilisant Respirométrie

Metabolic disorders are a frequent problem affecting human health. Therefore, understanding the mechanisms that regulate metabolism is a crucial ...

Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster

The last decades have witnessed the explosion of scientific interest around gene expression control mechanisms at the RNA level. This branch of molecular biology has been greatly fueled by the discovery of noncoding RNAs as major players in post-transcriptional regulation. Such a revolutionary perspective has been accompanied and triggered by the development of powerful technologies for profiling short RNAs expression, both at the high-throughput level (genome-wide identification) or as single-candidate analysis (steady state accumulation of specific species). Although several state-of-art strategies are currently available for dosing or visualizing such fleeing molecules, Northern Blot assay remains the eligible approach in molecular biology for immediate and accurate evaluation of RNA expression. It represents a first step toward the application of more sophisticated, costly technologies and, in many cases, remains a preferential method to easily gain insights into RNA biology. Here we overview an efficient protocol (Enhanced Northern Blot) for detecting weakly expressed microRNAs (or other small regulatory RNA species) from Drosophila melanogaster whole embryos, manually dissected larval/adult tissues or in vitro cultured cells. A very limited amount of RNA is required and the use of material from flow cytometry-isolated cells can be also envisaged.

Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster

The aim of this publication is to visualize and discuss the operative steps of an Enhanced Northern Blot protocol on RNA extracted from Drosophila melanogaster embryos, cells, and tissues. This protocol is particularly useful for the efficient detection of small RNA species.

Amélioration de la détection du Nord Blot des petits ARN espèces en<em&gt; Drosophila melanogaster</em

The last decades have witnessed the explosion of scientific interest around gene expression control mechanisms at the RNA level. This branch of molecular ...

Maintenance of a Drosophila melanogaster Population Cage

Large quantities of DNA, RNA, proteins and other cellular components are often required for biochemistry and molecular biology experiments. The short life cycle of Drosophila enables collection of large quantities of material from embryos, larvae, pupae and adult flies, in a synchronized way, at a low economic cost. A major strategy for propagating large numbers of flies is the use of a fly population cage. This useful and common tool in the Drososphila community is an efficient way to regularly produce milligrams to tens of grams of embryos, depending on uniformity of developmental stage desired. While a population cage can be time consuming to set up, maintaining a cage over months takes much less time and enables rapid collection of biological material in a short period. This paper describes a detailed and flexible protocol for the maintenance of a Drosophila melanogaster population cage, starting with 1.5 g of harvested material from the previous cycle.

Maintenance of a Drosophila melanogaster Population Cage

This manuscript reports a detailed protocol for culturing, on a regular basis, a population of Drosophila melanogaster using a fly population cage.

Le maintien d&#39;un<em&gt; Drosophila melanogaster</em&gt; Population Cage

Large quantities of DNA, RNA, proteins and other cellular components are often required for biochemistry and molecular biology experiments. The short life ...

Measurement of Carbon Dioxide Production from Radiolabeled Substrates in Drosophila melanogaster

The power of Drosophila genetics is increasingly being applied to questions of hormone signaling and metabolism and to the development of models of human disease in this organism. Sensitive methods for measurements of parameters such as metabolic rates are needed to drive the understanding of physiology and disease in small animals such as the fruit fly. The method described here assesses fuel oxidation in small numbers of adult flies fed food containing trace amounts of 14C-labeled substrates such as glucose or fatty acid. After the feeding period and any additional experimental manipulations, flies are transferred to short tubes capped with mesh, which are then placed in glass vials containing KOH-saturated filter paper that traps exhaled, radiolabeled CO2 generated from oxidation of radiolabeled substrates as potassium bicarbonate, KHCO3. This radiolabeled bicarbonate is measured by scintillation counting. This is a quantitative, reproducible, and simple approach for the study of fuel oxidation. The use of radiolabeled glucose, fatty acids, or amino acids allows determination of the contribution of these different fuel sources to energy metabolism under different conditions such as feeding and fasting and in different genetic backgrounds. This complements other approaches used to measure in vivo energy metabolism and should further the understanding of metabolic regulation.

Measurement of Carbon Dioxide Production from Radiolabeled Substrates in Drosophila melanogaster

This paper describes a method for the measurement of fuel oxidation in Drosophila melanogaster in which trace amounts of specific radiolabeled metabolic substrates are fed to flies. The exhaled radiolabeled CO2 that is a produced from fuel oxidation is collected and measured.

Mesure de dioxyde de carbone de production de radiomarqué Substrats en<em&gt; Drosophila melanogaster</em

The power of Drosophila genetics is increasingly being applied to questions of hormone signaling and metabolism and to the development of models of human ...