La ricerca nel laboratorio di MT è sostenuto da finanziamenti della National Science Foundation (DBI-0820610 e IOS-1022102) e il Dipartimento di Salute NY (NYSTEM-C024308). CM ha ricevuto borse di studio post-dottorato da parte del Ministero spagnolo dell&#39;Educazione e della Scienza (2007-0937) e la Fondazione Rafael del Pino, Spagna.

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M., Holappa, L., Gould, B., Jaramillo, M. A., Setnikov, D., Santiago, P. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Elaboration+of+B+gene+function+to+include+the+identity+of+novel+floral+organs+in+the+lower+eudicot+Aquilegia.">Elaboration of B gene function to include the identity of novel floral organs in the lower eudicot Aquilegia.</a> Plant Cell. 19, 750-766 (2007).</li><li>Lippman, Z. B., Cohen, O., Alvarez, J. P., Abu-Abied, M., Pekker, I., Paran, I., Eshed, Y., Zamir, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+making+of+a+compound+inflorescence+in+tomato+and+related+nightshades.">The making of a compound inflorescence in tomato and related nightshades.</a> PLoS Biol. 6, e288-e288 (2008).</li><li>Kidner, C., Timmermans, M. C. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+situ+hybridization+as+a+tool+to+study+the+role+of+microRNAs+in+plant+development.">In situ hybridization as a tool to study the role of microRNAs in plant development.</a> Methods. Mol. Biol. 342, 159-179 (2006).</li><li>Jackson, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Double+labeling+of+KNOTTED1+mRNA+and+protein+reveals+multiple+potential+sites+of+protein+trafficking+in+the+shoot.">Double labeling of KNOTTED1 mRNA and protein reveals multiple potential sites of protein trafficking in the shoot.</a> 129, 1423-1429 (2002).</li><li>Jensen, W. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Botanical Histochemistry. , 408-408 (1962).</li><li>Jackson, D., Bowles, D. J., Gurr, S. J., McPherson, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+situ+hybridization+in+plants.">In situ hybridization in plants.</a> Molecular Plant Pathology: A Practical Approach. , 163-174 (1991).</li><li>Chitwood, D. H., Nogueira, F. T., Howell, M. o. n. t. g. o. m. e. r. y., Carrington, T. A., C, J., Timmermans, M. C. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pattern+formation+via+small+RNA+mobility.">Pattern formation via small RNA mobility.</a> Genes. Dev. 23, 549-554 (2009).</li><li>Piette, D., Hendrickx, M., Willems, E., Kemp, C. R., Leyns, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+optimized+procedure+for+whole-mount+in+situ+hybridization+on+mouse+embryos+and+embryoid+bodies.">An optimized procedure for whole-mount in situ hybridization on mouse embryos and embryoid bodies.</a> Nat. Protoc. 3, 1194-1201 (2008).</li><li>Blilou, I., Xu, J., Wildwater, M., Willemsen, V., Paponov, I., Friml, J., Heidstra, R., Aida, M., Palme, K., Scheres, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+PIN+auxin+efflux+facilitator+network+controls+growth+and+patterning+in+Arabidopsis+roots.">The PIN auxin efflux facilitator network controls growth and patterning in Arabidopsis roots.</a> Nature. 433, 39-44 (2005).</li><li>Jackson, D., Hake, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Control+of+phyllotaxy+in+maize+by+the+abphyl1+gene.">Control of phyllotaxy in maize by the abphyl1 gene.</a> Development. , 126-315 (1999).</li><li>Chuck, G., Whipple, C., Jackson, D., Hake, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+maize+SBP-box+transcription+factor+encoded+by+tasselsheath4+regulates+bract+development+and+the+establishment+of+meristem+boundaries.">The maize SBP-box transcription factor encoded by tasselsheath4 regulates bract development and the establishment of meristem boundaries.</a> Development. 137, 1243-1250 (2010).</li><li>Long, J. A., Barton, M. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+development+of+apical+embryonic+pattern+in+Arabidopsis.">The development of apical embryonic pattern in Arabidopsis.</a> Development. 125, 3027-3035 (1998).</li><li>Nogueira, F. T., Chitwood, D. H., Madi, S., Ohtsu, K., Schnable, P. S., Scanlon, M. J., Timmermans, M. C. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Regulation+of+small+RNA+accumulation+in+the+maize+shoot+apex.">Regulation of small RNA accumulation in the maize shoot apex.</a> PLoS Genet. 5, e1000320-e1000320 (2009).</li></ol>

Nessun conflitto di interessi dichiarati.

Il metodo di ibridazione in situ qui delineato permette la visualizzazione diretta del pattern di espressione spazio-temporale di un gene di interesse con grande risoluzione cellulare, elevata sensibilità e specificità. Il protocollo non consente un confronto quantitativo dei livelli di espressione tra geni. Tuttavia, elevata sensibilità del metodo e la risoluzione può rivelare gradienti di espressione genica in un tessuto 8, 18, ​​che non è possibile con la maggior parte di altri metodi di analisi di espressione genica. Il protocollo comprende molte tappe, che può rendere problematica la risoluzione dei problemi. Le fasi più critiche del protocollo sono la fissazione dei tessuti e la selezione e l&#39;etichettatura della sonda. Scarsamente nei tessuti infiltrati e sonde con l&#39;incorporazione DIG bassa darà segnali molto deboli che potrebbero essere difficili da rilevare sopra di fondo. Per ogni nuovo gene di interesse, si consiglia di provare un paio di sonde distinte derivanti da diveraffitto regioni della trascrizione. A volte, due o tre sonde targeting diverse regioni più piccole del gene potrebbe essere necessario essere combinati per ottenere un segnale di ibridazione forte e specifico. Inoltre, le condizioni di ibridazione, come la temperatura e la composizione del buffer di ibridazione, può essere ottimizzato per ogni gene o tessuto per abbassare o aumentare la severità ibridazione. Anche la fase di trattamento della proteasi è una variabile e può essere modificato per adattare il protocollo per diverse specie di piante o per la rilevazione delle trascrizioni con abbondanza molto basso. L&#39;inclusione di entrambe le sonde di controllo positivo e negativo sarà utile per identificare i punti problematici del protocollo. La procedura è ottimizzata per paraffina sezioni di impianto di tessuto, ma con piccole modifiche può essere utilizzato anche per tutto il montaggio di ibridazione in situ. Benché ampiamente utilizzati nella ricerca animale 19, montare tutto ibridazione in situ è limited di tessuti vegetali che possono essere facilmente infiltrati, come gli embrioni, radici o giovani tessuti meristematici 20,21. Il protocollo può anche essere facilmente modificato per determinare simultaneamente due distinte o localizzare mRNA trascritti a fianco delle proteine ​​15,22,23. Infine, è possibile estendere l&#39;applicazione di questo metodo per la visualizzazione di piccoli pattern di espressione di RNA nelle piante. pattern di espressione di miRNA sono stati determinati utilizzando questo protocollo sia in mais e Arabidopsis 8,14. Più recentemente, il sonde in vitro trascritto sono stati sostituiti da commercialmente disponibile DIG marcato blocco degli acidi nucleici (LNA) sonde oligo che aumentare la sensibilità del segnale 18, 24.

<table border="1"><tbody><tr><th> Prodotto </th><th> Azienda </th><th> Numero di catalogo </th><th> Osservazioni </th></tr><tr><td> Cytoseal 60 4 oz </td><td> Pescatore </td><td> 23-244-256 </td><td> A base di toluene 8310-4 </td></tr><tr><td> Histoclear </td><td> Pescatore </td><td> 50-899-90147 </td><td></td></tr><tr><td> Percorso tessuto Paraplast Plus. </td><td> Pescatore </td><td> 23-021-400 </td><td></td></tr><tr><td> N + nylon membrana Hybond-N + </td><td> GE Healthcare </td><td> RPN203B </td><td></td></tr><tr><td> RNasi OUT; 40 U / mL </td><td> Invitrogen </td><td> 10777019 </td><td></td></tr><tr><td> RQ1 RNase-Free DNase, 1 U / mL </td><td> Promega </td><td> M6101 </td><td></td></tr><tr><td> DIG marcato controllo RNA </td><td> Roche </td><td> 11585746910 </td><td></td></tr><tr><td> DIG RNA etichettatura mix </td><td> Roche </td><td> 11277073910 </td><td></td></tr><tr><td> SP6 RNA polimerasi 1.000 U </td><td> Roche </td><td> 10810274001 </td><td&gt; </td></tr><tr><td> T3 RNA polimerasi 1.000 U </td><td> Roche </td><td> 11031163001 </td><td></td></tr><tr><td> T7 RNA polimerasi 1.000 U </td><td> Roche </td><td> 10881767001 </td><td></td></tr><tr><td> RNasi-A </td><td> Roche </td><td> 109142 </td><td> sciogliere in glicerolo pH8.0 50% Tris 100mM </td></tr><tr><td> Blocco dei reagenti </td><td> Roche </td><td> 1 096 176 </td><td> Calore fino a 70 ° C in tampone TBS </td></tr><tr><td> Anti-digossigenina-AP, frammenti Fab di pecora 150 U </td><td> Roche </td><td> 1 093 274 </td><td></td></tr><tr><td> NBT / BCIP Soluzione </td><td> Roche </td><td> 1 681 451 </td><td></td></tr><tr><td> Mini Quick Spin RNA Colonne </td><td> Roche </td><td> 11814427001 </td><td></td></tr><tr><td> tRNA da E. coli </td><td> Roche </td><td> 109541 </td><td></td></tr><tr><td> ® Triton X-100 </td><td> Sigma </td><td> T8787 </td><td></td></tr><tr><td> Tween-20</td><td> Sigma </td><td> P9416 </td><td></td></tr><tr><td> Formammide deionizzata </td><td> Sigma </td><td> F9037 </td><td></td></tr><tr><td> Proteasi da Streptomyces griseus Tipo XIV </td><td> Sigma </td><td> P5147 </td><td> Diluire in acqua MilliQ e pre-digerire 4 ore a 37 ° C </td></tr><tr><td> Trietanolammina </td><td> Sigma </td><td> 90279 </td><td> Diluire in acqua, portare a pH8.0 con HCl </td></tr><tr><td> Anidride acetica </td><td> Sigma </td><td> A6404 </td><td></td></tr><tr><td> Destrano solfato di sodio sale da Leuconostoc spp. </td><td> Sigma </td><td> D8906-5G </td><td> Solfato di destrano deve essere riscaldato a 80 ° C a dissolversi. </td></tr><tr><td> Soluzione Denhardt di 50x Concentrate </td><td> Sigma </td><td> D2532 </td><td></td></tr><tr><td> Albumina da siero bovino - ≥ 98% </td><td> Sigma </td><td> A7906 </td><td></td></tr><tr><td> Eosina G sale disodico </td><td> Sigma </td><td> E4382 </td><td> Sciogliere in etanolo 96-100% fino a saturazione </td></tr><tr><td> Paraformaldeide </td><td> Sigma </td><td> P6148 </td><td></td></tr><tr><td> Etanolo assoluto 200 prova </td><td></td><td></td><td></td></tr><tr><td> Fenolo / cloroformio </td><td></td><td></td><td></td></tr><tr><td> Base stampi </td><td> Elettronica Microsocpy Scienza </td><td> 62352-15 </td><td></td></tr><tr><td> Anelli di embedding </td><td> Pescatore </td><td> 22-038-197 </td><td></td></tr><tr><td> 20ml fiale monouso scintillazione, con tappi </td><td> VWR </td><td> 66020-326 </td><td></td></tr><tr><td> Sonda-on-più diapositive </td><td> Pescatore </td><td> 22-230-900 </td><td></td></tr><tr><td> Vetri di copertura micro millimetri 24x50 </td><td> VWR </td><td> 48404-452 </td><td></td></tr><tr><td> Whatman carta 3 millimetri </td><td> VWR </td><td> 89022-360 </td><td></td></tr><tr><td> Tre piatti di vetro e uno StaiNLES acciaio cremagliera scivolo </td><td> Elettronica Microsocpy Scienza </td><td> 71420-25 </td><td> Due vetri bombati sono necessari per il trattamento histoclear e l&#39;ultima è utilizzato per il trattamento anidride acetica </td></tr><tr><td> 18 contenitori in plastica pulita </td><td> Elettronica Microsocpy Scienza </td><td> 71402 </td><td></td></tr><tr><td> 2 o 3 grandi scatole di piatti in plastica con coperchio richiudibile </td><td></td><td></td><td> necessari per le fasi di ibridazione e di anticorpi </td></tr><tr><td> Spazzole multa </td><td></td><td></td><td> Aiuto consegna cartucce a cera </td></tr><tr><td> Microtomo </td><td></td><td></td><td> Leica </td></tr><tr><td> Sistema autopulente a vuoto a secco </td><td> Welch </td><td> 2025 </td><td></td></tr><tr><td> Far scorrere più caldi </td><td> Pescatore </td><td></td><td></td></tr><tr><td> Riscaldamento blocco </td><td></td><td></td><td> necessari a 60 ° C e 85 ° C</td></tr><tr><td> Incubatore a 58-60 ° C </td><td> Pescatore </td><td></td><td> Per la procedura con Paraplast fusa </td></tr><tr><td> Forni o bagni di acqua di 55 ° C e 37 ° C </td><td> Pescatore </td><td></td><td> Necessità a causa del rapido cambio tra due temperature </td></tr><tr><td> Centrifuga (4 ° C - 20 ° C) </td><td></td><td></td><td></td></tr><tr><td> Cappa </td><td></td><td></td><td></td></tr></tbody></table>

in situ hybridization for the precise localization of transcripts in plants

Con i progressi della ricerca genomica del decennio passato, biologia vegetale ha visto numerosi studi che presentano le analisi quantitative su larga scala dell&#39;espressione genica. Microarray e approcci di sequenziamento prossima generazione vengono utilizzati per studiare i processi evolutivi di risposta, fisiologiche e di stress, sezionare epigenetici e piccoli percorsi di RNA, e costruire reti geniche di grandi dimensioni regolamentari 1-3. Mentre queste tecniche di facilitare l&#39;analisi simultanea di insiemi gene di grandi dimensioni, in genere offrono una risoluzione spazio-temporale molto limitato di cambiamenti di espressione genica. Questo limite può essere superato parzialmente utilizzando profili metodo in combinazione con lasermicrodissection o fluorescenza-attivato l&#39;ordinamento delle cellule 4-7. Tuttavia, per comprendere appieno il ruolo biologico di un gene, la conoscenza del proprio modello spazio-temporale di espressione ad una risoluzione cellulare è essenziale. In particolare, quando si studia lo sviluppo o gli effetti di sti ambientaliMuli e mutanti in grado l&#39;analisi dettagliata del pattern di espressione di un gene è diventato essenziale. Per esempio, sottili differenze quantitative nei livelli di espressione dei principali geni regolatori può portare a fenotipi drammatico se associato con la perdita o il guadagno di espressione in tipi cellulari specifici. Diversi metodi sono abitualmente utilizzati per l&#39;esame dettagliato dei modelli di espressione genica. Uno è attraverso l&#39;analisi delle linee di giornalista transgeniche. Tale analisi può però diventare molto tempo quando si analizzano più geni o di lavoro negli impianti recalcitranti alla trasformazione. Inoltre, una convalida indipendente per garantire che il modello di espressione del transgene imita quella del gene endogeno è in genere necessaria. Localizzazione immunoistochimica di proteine ​​o l&#39;mRNA di ibridazione in situ presentare alternative relativamente veloce per la visualizzazione diretta dell&#39;espressione dei geni all&#39;interno delle cellule e dei tessuti. Quest&#39;ultimo ha il vantaggio che può essere facilmente used su qualsiasi gene di interesse. ibridazione in situ permette la rilevazione di mRNA bersaglio nelle cellule tramite l&#39;ibridazione con un marcato senso anti-RNA sonda ottenuti in vitro la trascrizione del gene di interesse. Qui delineare un protocollo per la localizzazione in situ di espressione genica nelle piante che è altamente sensibilità e specifici. È ottimizzato per l&#39;utilizzo con fisso paraformaldeide, incluse in paraffina sezioni, che danno ottima conservazione di istologia e sonde DIG marcato che vengono visualizzati da immuno-rilevazione e alcalino-fosfatasi reazione colorimetrica. Questo protocollo è stato applicato con successo ad un certo numero di tessuti da una vasta gamma di specie vegetali, e può essere utilizzato per analizzare l&#39;espressione di mRNA e piccoli RNA 8-14.

Watch this Scientific Journal Video about In Situ Hybridization for the Precise Localization of Transcripts in Plants at JoVE.com

In Situ Hybridization for the Precise Localization of Transcripts in Plants

Il<em&gt; In situ</em&gt; Protocollo di ibridazione qui descritto permette una localizzazione diretta di mRNA e piccoli RNA espressione a livello cellulare con alta sensibilità e specificità. La procedura è ottimizzata per paraffina sezioni di impianto di tessuto, è applicabile ad una vasta gamma di piante e tessuti, e può essere completato entro dieci giorni.

Ibridazione in situ per la localizzazione precisa delle Trascrizioni nelle piante

With the advances in genomics research of the past decade, plant biology has seen numerous studies presenting large-scale quantitative analyses of gene ...

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Biology

In Situ Hybridization for the Precise Localization of Transcripts in Plants

51.2K Views.  Cold Spring Harbor Laboratory. Il In situ Protocollo di ibridazione qui descritto permette una localizzazione diretta di mRNA e piccoli RNA espressione a livello cellulare con alta sensibilità e specificità. La procedura è ottimizzata per paraffina sezioni di impianto di tessuto, è applicabile ad una vasta gamma di piante e tessuti, e può essere completato entro dieci giorni.

Video: In Situ Hybridization for the Precise Localization of Transcripts in Plants

Double Whole Mount in situ Hybridization of Early Chick Embryos

The chick embryo is a valuable tool in the study of early embryonic development. Its transparency, accessibility and ease of manipulation, make it an ideal tool for studying  gene expression in brain, neural tube, somite and heart primordia formation. This video demonstrates the different steps in 2-color whole mount in situ hybridization; First, the embryo is dissected from the egg and fixed in paraformaldehyde. Second, the embryo is processed for prehybridization. The embryo is then hybridized with two different probes, one coupled to DIG, and one coupled to FITC.  Following overnight hybridization, the embryo is incubated with DIG coupled antibody. Color reaction for DIG substrate is performed, and the region of interest appears blue. The embryo is then incubated with FITC coupled antibody. The embryo is processed for color reaction with FITC, and the region of interest appears red. Finally, the embryo is fixed and processed for phtograph and sectioning. A troubleshooting guide is also presented.

This video demonstrates 2-color whole mount in situ hybridization, a method by which the spatial and temporal expression pattern of 2 different genes can be visualized in young chick embryos. This method was originally introduced by David Wilkinson, Domingos Henrique, Phil Ingham and David Ish -Horowicz.

Doppia Monte intero ibridazione in situ di embrioni di pollo primi

The chick embryo is a valuable tool in the study of early embryonic development. Its transparency, accessibility and ease of manipulation, make it an ...

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Biologia

Fluorescence in situ hybridization (FISH) Protocol in Human Sperm

Aneuploidies are the most frequent chromosomal abnormalities in humans. Most of these abnormalities result from meiotic errors during the gametogenic process in the parents. In human males, these errors can lead to the production of spermatozoa with numerical chromosome abnormalities which represent an increased risk of transmitting these anomalies to the offspring.
For this reason, the technique of fluorescence in situ hybridization (FISH) on sperm nuclei has become a protocol widely incorporated in the context of clinical diagnosis. This practice provides an estimate of the frequencies of numerical chromosome abnormalities in the gametes of the patients that seek for genetic reproductive advice.
To date, the chromosomes most frequently included in sperm FISH analysis are chromosomes X, Y, 13, 18 and 21.
This video-article describes, step by step, how to process and fix a human semen sample, how to decondense and denature the sperm chromatin, how to proceed to obtain sperm FISH preparations, and how to visualize the results at the microscope. Special remarks of the most relevant steps are given to achieve the best results.

Fluorescence in situ hybridization FISH Protocol in Human Sperm

This video-article describes, step by step, how to process a semen sample to achieve good-quality fluorescence in situ hybridization on human spermatozoa. Preparations obtained can be used for aneuploidy screening in the context of clinical diagnosis.

Fluorescenza In situ</emIbridazione> (FISH) Protocollo di sperma umano

Aneuploidies are the most frequent chromosomal abnormalities in humans. Most of these abnormalities result from meiotic errors during the gametogenic ...

Radioactive in situ Hybridization for Detecting Diverse Gene Expression Patterns in Tissue

Knowing the timing, level, cellular localization, and cell type that a gene is expressed in contributes to our understanding of the function of the gene. Each of these features can be accomplished with in situ hybridization to mRNAs within cells. Here we present a radioactive in situ hybridization method modified from Clayton et al. (1988)1 that has been working successfully in our lab for many years, especially for adult vertebrate brains2-5. The long complementary RNA (cRNA) probes to the target sequence allows for detection of low abundance transcripts6,7. Incorporation of radioactive nucleotides into the cRNA probes allows for further detection sensitivity of low abundance transcripts and quantitative analyses, either by light sensitive x-ray film or emulsion coated over the tissue. These detection methods provide a long-term record of target gene expression. Compared with non-radioactive probe methods, such as DIG-labeling, the radioactive probe hybridization method does not require multiple amplification steps using HRP-antibodies and/or TSA kit to detect low abundance transcripts. Therefore, this method provides a linear relation between signal intensity and targeted mRNA amounts for quantitative analysis. It allows processing 100-200 slides simultaneously. It works well for different developmental stages of embryos. Most developmental studies of gene expression use whole embryos and non-radioactive approaches8,9, in part because embryonic tissue is more fragile than adult tissue, with less cohesion between cells, making it difficult to see boundaries between cell populations with tissue sections. In contrast, our radioactive approach, due to the larger range of sensitivity, is able to obtain higher contrast in resolution of gene expression between tissue regions, making it easier to see boundaries between populations. Using this method, researchers could reveal the possible significance of a newly identified gene, and further predict the function of the gene of interest.

Radioactive in situ Hybridization for Detecting Diverse Gene Expression Patterns in Tissue

This protocol is successfully used to quantitatively detect levels and spatial patterns of mRNA expression in multiple tissue types across vertebrate species. The method can detect low abundance transcripts and allows processing of hundreds of slides simultaneously. We present this protocol using expression profiling of avian embryonic brain formation as an example.

Radioattivo In situ Ibridazione per il rilevamento Diversi schemi di espressione genica nei tessuti

Knowing the timing, level, cellular localization, and cell type that a gene is expressed in contributes to our understanding of the function of the gene. ...

Detection of Viral RNA by Fluorescence in situ Hybridization (FISH)

Viruses that infect cells elicit specific changes to normal cell functions which serve to divert energy and resources for viral replication. Many aspects of host cell function are commandeered by viruses, usually by the expression of viral gene products that recruit host cell proteins and machineries. Moreover, viruses engineer specific membrane organelles or tag on to mobile vesicles and motor proteins to target regions of the cell (during de novo infection, viruses co-opt molecular motor proteins to target the nucleus; later, during virus assembly, they will hijack cellular machineries that will help in the assembly of viruses). Less is understood on how viruses, in particular those with RNA genomes, coordinate the intracellular trafficking of both protein and RNA components and how they achieve assembly of infectious particles at specific loci in the cell. The study of RNA localization began in earlier work. Developing lower eukaryotic embryos and neuronal cells provided important biological information, and also underscored the importance of RNA localization in the programming of gene expression cascades. The study in other organisms and cell systems has yielded similar important information. Viruses are obligate parasites and must utilise their host cells to replicate. Thus, it is critical to understand how RNA viruses direct their RNA genomes from the nucleus, through the nuclear pore, through the cytoplasm and on to one of its final destinations, into progeny virus particles 1.
FISH serves as a useful tool to identify changes in steady-state localization of viral RNA. When combined with immunofluorescence (IF) analysis 22, FISH/IF co-analyses will provide information on the co-localization of proteins with the viral RNA3. This analysis therefore provides a good starting point to test for RNA-protein interactions by other biochemical or biophysical tests 4,5, since co-localization by itself is not enough evidence to be certain of an interaction. In studying viral RNA localization using a method like this, abundant information has been gained on both viral and cellular RNA trafficking events 6. For instance, HIV-1 produces RNA in the nucleus of infected cells but the RNA is only translated in the cytoplasm. When one key viral protein is missing (Rev) 7, FISH of the viral RNA has revealed that the block to viral replication is due to the retention of the HIV-1 genomic RNA in the nucleus 8. 
Here, we present the method for visual analysis of viral genomic RNA in situ. The method makes use of a labelled RNA probe. This probe is designed to be complementary to the viral genomic RNA. During the in vitro synthesis of the antisense RNA probe, the ribonucleotide that is modified with digoxigenin (DIG) is included in an in vitro transcription reaction. Once the probe has hybridized to the target mRNA in cells, subsequent antibody labelling steps (Figure 1) will reveal the localization of the mRNA as well as proteins of interest when performing FISH/IF.

Detection of Viral RNA by Fluorescence in situ Hybridization FISH

A fluorescence in situ hybridization (FISH) method was developed to visually detect viral genomic RNA using fluorescence microscopy. A probe is made with specificity to the viral RNA that can then be identified using a combination of hybridization and immunofluorescence techniques. This technique offers the advantage of identifying the localization of the viral RNA or DNA at steady-state, providing information on the control of intracellular virus trafficking events.

Rilevamento di RNA virale per fluorescenza<em&gt; In situ</em&gt; Hybridization (FISH)

Viruses  that infect cells elicit specific changes to normal cell functions which serve  to divert energy and resources for viral replication. Many ...

Whole Mount RNA Fluorescent in situ Hybridization of Drosophila Embryos

Assessing the expression pattern of a gene, as well as the subcellular localization properties of its transcribed RNA, are key features for understanding its biological function during development. RNA in situ hybridization (RNA-ISH) is a powerful method used for visualizing RNA distribution properties, be it at the organismal, cellular or subcellular levels 1. RNA-ISH is based on the hybridization of a labeled nucleic acid probe (e.g. antisense RNA, oligonucleotides) complementary to the sequence of an mRNA or a non-coding RNA target of interest 2. As the procedure requires primary sequence information alone to generate sequence-specific probes, it can be universally applied to a broad range of organisms and tissue specimens 3. Indeed, a number of large-scale ISH studies have been implemented to document gene expression and RNA localization dynamics in various model organisms, which has led to the establishment of important community resources 4-11. While a variety of probe labeling and detection strategies have been developed over the years, the combined usage of fluorescently-labeled detection reagents and enzymatic signal amplification steps offer significant enhancements in the sensitivity and resolution of the procedure 12. Here, we describe an optimized fluorescent in situ hybridization method (FISH) employing tyramide signal amplification (TSA) to visualize RNA expression and localization dynamics in staged Drosophila embryos. The procedure is carried out in 96-well PCR plate format, which greatly facilitates the simultaneous processing of large numbers of samples.

Whole Mount RNA Fluorescent in situ Hybridization of Drosophila Embryos

Here we describe a whole-mount fluorescent in situ hybridization (FISH) protocol for determining the expression and localization properties of RNAs expressed during embryogenesis in the fruit fly, Drosophila melanogaster.

Tutta la Monte RNA fluorescente<em&gt; In situ</em&gt; L&#39;ibridazione di<em&gt; Drosophila</em&gt; Embrioni

Assessing  the expression pattern of a gene, as well as the subcellular localization  properties of its transcribed RNA, are key features for ...

Visualization and Analysis of mRNA Molecules Using Fluorescence In Situ Hybridization in Saccharomyces cerevisiae

The Fluorescence in situ Hybridization (FISH) method allows one to detect nucleic acids in the native cellular environment. Here we provide a protocol for using FISH to quantify the number of mRNAs in single yeast cells. Cells can be grown in any condition of interest and then fixed and made permeable. Subsequently, multiple single-stranded deoxyoligonucleotides conjugated to fluorescent dyes are used to label and visualize mRNAs. Diffraction-limited fluorescence from single mRNA molecules is quantified using a spot-detection algorithm to identify and count the number of mRNAs per cell. While the more standard quantification methods of northern blots, RT-PCR and gene expression microarrays provide information on average mRNAs in the bulk population, FISH facilitates both the counting and localization of these mRNAs in single cells at single-molecule resolution.

Visualization and Analysis of mRNA Molecules Using Fluorescence In Situ Hybridization in Saccharomyces cerevisiae

This protocol describes an experimental procedure for performing Fluorescence in situ Hybridization (FISH) for counting mRNAs in single cells at single-molecule resolution.

Visualizzazione e l&#39;analisi di molecole di mRNA mediante fluorescenza<em&gt; In Situ</em&gt; Ibridazione in<em&gt; Saccharomyces cerevisiae</em

The Fluorescence in situ Hybridization (FISH) method allows one to detect nucleic acids in the native cellular environment. Here we provide a protocol for ...

MicroRNA In situ Hybridization for Formalin Fixed Kidney Tissues

In this article we describe a method for colorimetric detection of miRNA in the kidney through in situ hybridization with digoxigenin tagged microRNA probes. This protocol, originally developed by Kloosterman and colleagues for broad use with Exiqon miRNA probes1, has been modified to overcome challenges inherent in miRNA analysis in kidney tissues. These include issues such as structure identification and hard to remove residual probe and antibody. Use of relatively thin, 5 mm thick, tissue sections allowed for clear visualization of kidney structures, while a strong probe signal was retained in cells. Additionally, probe concentration and incubation conditions were optimized to facilitate visualization of microRNA expression with low background and nonspecific signal. Here, the optimized protocol is described, covering the initial tissue collection and preparation through the mounting of slides at the end of the procedure. The basic components of this protocol can be altered for application to other tissues and cell culture models.

MicroRNA In situ Hybridization for Formalin Fixed Kidney Tissues

This article describes an in situ hybridization protocol optimized for colormetric detection of microRNA expression in formalin fixed kidney sections.

MicroRNA<em&gt; In situ</em&gt; Ibridazione per tessuti renali fissati in formalina

In this article we describe a method for colorimetric detection of miRNA in the kidney through in situ hybridization with digoxigenin tagged microRNA ...

Simple Method for Fluorescence DNA In Situ Hybridization to Squashed Chromosomes

DNA in situ hybridization (DNA ISH) is a commonly used method for mapping sequences to specific chromosome regions. This approach is particularly effective at mapping highly repetitive sequences to heterochromatic regions, where computational approaches face prohibitive challenges. Here we describe a streamlined protocol for DNA ISH that circumvents formamide washes that are standard steps in other DNA ISH protocols. Our protocol is optimized for hybridization with short single strand DNA probes that carry fluorescent dyes, which effectively mark repetitive DNA sequences within heterochromatic chromosomal regions across a number of different insect tissue types. However, applications may be extended to use with larger probes and visualization of single copy (non-repetitive) DNA sequences. We demonstrate this method by mapping several different repetitive sequences to squashed chromosomes from Drosophila melanogaster neural cells and Nasonia vitripennis spermatocytes. We show hybridization patterns for both small, commercially synthesized probes and for a larger probe for comparison. This procedure uses simple laboratory supplies and reagents, and is ideal for investigators who have little experience with performing DNA ISH.

Simple Method for Fluorescence DNA In Situ Hybridization to Squashed Chromosomes

Here, we present a simple method for performing fluorescence DNA in situ hybridization (DNA ISH) to visualize repetitive heterochromatic sequences on slide-mounted chromosomes. The method requires minimal reagents and it is versatile for use with short or long probes, different tissues, and detection with fluorescence or non-fluorescence-based signals.

Metodo semplice per DNA fluorescenza<em&gt; In Situ</em&gt; Ibridazione di cromosomi Squashed

DNA in situ hybridization (DNA ISH) is a commonly used method for mapping sequences to specific chromosome regions. This approach is particularly ...

A Whole Mount In Situ Hybridization Method for the Gastropod Mollusc Lymnaea stagnalis

Whole mount in situ hybridization (WMISH) is a technique that allows for the spatial resolution of nucleic acid molecules (often mRNAs) within a &#39;whole mount&#39; tissue preparation, or developmental stage (such as an embryo or larva) of interest. WMISH is extremely powerful because it can significantly contribute to the functional characterization of complex metazoan genomes, a challenge that is becoming more of a bottleneck with the deluge of next generation sequence data. Despite the conceptual simplicity of the technique much time is often needed to optimize the various parameters inherent to WMISH experiments for novel model systems; subtle differences in the cellular and biochemical properties between tissue types and developmental stages mean that a single WMISH method may not be appropriate for all situations. We have developed a set of WMISH methods for the re-emerging gastropod model Lymnaea stagnalis that generate consistent and clear WMISH signals for a range of genes, and across all developmental stages. These methods include the assignment of larvae of unknown chronological age to an ontogenetic window, the efficient removal of embryos and larvae from their egg capsules, the application of an appropriate Proteinase-K treatment for each ontogenetic window, and hybridization, post-hybridization and immunodetection steps. These methods provide a foundation from which the resulting signal for a given RNA transcript can be further refined with probe specific adjustments (primarily probe concentration and hybridization temperature).

A Whole Mount In Situ Hybridization Method for the Gastropod Mollusc Lymnaea stagnalis

The goal of this protocol is to provide users with a set of methods for the high-throughput decapsulation of Lymnaea stagnalis embryos and larvae in preparation for whole mount in situ hybridization, and for subsequent pre- and post-hybridization treatments.

A monte intero<em&gt; In Situ</em&gt; Metodo ibridazione per la molluschi gasteropodi<em&gt; stagnalis Lymnaea</em

Whole mount in situ hybridization (WMISH) is a technique that allows for the spatial resolution of nucleic acid molecules (often mRNAs) within a ...

Method for Labeling Transcripts in Individual Escherichia coli Cells for Single-molecule Fluorescence In Situ Hybridization Experiments

A method is described for labeling individual messenger RNA (mRNA) transcripts in fixed bacteria for use in single-molecule fluorescence in situ hybridization (smFISH) experiments in E. coli. smFISH allows the measurement of cell-to-cell variability in mRNA copy number of genes of interest, as well as the subcellular location of the transcripts. The main steps involved are fixation of the bacterial cell culture, permeabilization of cell membranes, and hybridization of the target transcripts with sets of commercially available short fluorescently-labeled oligonucleotide probes. smFISH can allow the imaging of the transcripts of multiple genes in the same cell, with limitations imposed by the spectral overlap between different fluorescent markers. Following completion of the protocol illustrated below, cells can be readily imaged using a microscope coupled with a camera suitable for low-intensity fluorescence. These images, together with cell contours obtained from segmentation of phase contrast frames, or from cell membrane staining, allow the calculation of the mRNA copy number distribution of a sample of cells using open-source or custom-written software. The labeling method described here can also be applied to image transcripts with stochastic optical reconstruction microscopy (STORM).

Method for Labeling Transcripts in Individual Escherichia coli Cells for Single-molecule Fluorescence In Situ Hybridization Experiments

This manuscript describes a method for labeling individual messenger RNA (mRNA) transcripts with fluorescently-labeled DNA probes, for use in single-molecule fluorescence in situ hybridization (smFISH) experiments in E. coli. smFISH is a visualization method that allows the simultaneous detection, localization, and quantification of single mRNA molecules in fixed individual cells.

Metodo per l'etichettatura di trascrizioni in cellule individuali Escherichia coli per singola molecola di fluorescenza In Situ gli esperimenti di ibridazione

Methods Article

Ibridazione in situ per la localizzazione precisa delle Trascrizioni nelle piante