Bu çalışma Alman Araştırma Vakfı (; LU1455/1-1 DFG) bir hibe ile desteklenmiştir.

1. Ex ovo Kültürü <ol><li> Taze döllenmiş yumurtalar kuluçka için% 60 nem oranı ile 37.5 bir zorunlu taslak inkübatör (BSS160, Ehret, Almanya) ° C uzun yüzüne serilir. Daha uzun bir hafta boyunca 12 ° C de muhafaza yumurtalar kullanılmamalıdır. </li><li> 2.5 gün (evre HH17 hakkında) inkübasyondan sonra, yumurtalar dışarı almak ve kırmak için yönünü belirtmek için kalem ile üst etiketleyin. </li><li> Çatlama önce, temiz bir büyük Petri (; Greiner Bio-One GmbH, Almanya 145 mm çapında) içine yaklaşık 20 ml steril distile su dökün. </li><li> Büyük Petri kabına; başka küçük steril Petri (Greiner Bio-One GmbH 94 mm çap) yerleştirin. </li><li> Keskin bir metal kenarına altındaki yumurtaları kırın, dikkatli yumurta açın ve küçük Petri kabına her yumurta tüm içerik aktarmak. </li><li> Kapaklı büyük Petri Kapak ve başka bir inkübatör (BINDER GmbH, Tuttlinge, Almanya) koydudaha da kültürü için 37.5 ° C&#39;de yaklaşık% 60 nem. Gün arasında arzu edilen sayıda inkübasyondan sonra, embriyo elektroporasyon için de kullanılabilir. </li></ol> 2. Ex ovo Elektroporasyon Hazırlık <ol><li> 1.0-mm çapında (TW100F-4; Dünya Hassas Aletler) cam tüpler kullanılarak; bir mikroelektrot çektirmenin (Dünya Hassas Aletler, Berlin, Almanya PUL-100 Mikropipet Çektirme) ile cam kılcal çekin ve uygun bir cam içine kılcal damarların ucu kırmak çapı. </li><li> Elektroporasyon için uygun parametreler (yani embriyoların farklı dokuları ve boyut için farklı voltajlar) kurulmuş ve elektroporatörün (CUY21-Düzen; Nepa Gen, Chiba, Japonya) elektrotlar bağlanmak embriyoların hedef doku ve büyüklüğüne göre. </li><li> Ve bir işaretleyici gen, bir hedef genin kodlayan pCAGGS vektör içinde plazmidler, örneğin, cadherin7 (2.0 ug / ml bir konsantrasyona sahip pCAGGS-Cad7 Cad7) içeren bir plasmid çözeltisi hazırlayınörneğin, yeşil floresan protein (GFP; 0.25 mcg / ml &#39;lik bir konsantrasyon ile pCAGGS-GFP). Sonra yeşil renk ile plazmit çözeltisi etiketlemek için% 0.1 &#39;lik bir son konsantrasyon (Sigma) ile hızlı Green ekleyebilir. </li><li> Bir ağız pipet kullanılarak plazmid çözeltisi ile kılcal cam yerleştirin. </li></ol> 3. Ex ovo Elektroporasyon Chicken Optik Tectum içine Gen Transferi <ol><li> Ex ovo kültürden sonra, örneğin, günde inkübasyon (E) 6 tarafından, tavuk embriyo ex ovo elektroporasyon için kullanılmaktadır. </li><li> Dikkatli bir şekilde ince forseps optik tectum üzerinde vitelline ve amniyon membran yırtılma ve tectum yüzeyinde steril% 0.9 sodyum klorür çözeltisi 3 damla ilave edin. </li><li> Ağız pipet kullanılarak kapiler cam tarafından tectum boşluğu içine plazmid çözeltisi enjekte edilir. </li><li> Tectum yanında bir tungsten iğne katot ve bir dikdörtgen plaka anot (CUY 661-3x7, Nepa Gen) ile elektrotlar yerleştirin vehemen tectum için elektroporatörün tarafından üretilen elektrik dalgaları (altı bakliyat, 25 V, 60 ms darbe uzunluğu, her durumda 100 ms aralıklarla) uygulanır. </li><li> Kapaklı büyük Petri kabı kaplayın ve inkübatör içine döner. Uygun gün (ör., 2 ya da 3 gün sonra, elektroporasyon) inkübasyondan sonra, tectum immüno-(Şekil 1) ve biyolojik tespiti için toplanır ve tespit edilir. </li></ol> 4. Temsilcisi Sonuçlar Ex ovo elektroporasyon ile Cad7 ve GFP bir eksojen proteinleri başarılı bir şekilde aşırı ekspresyonu bir örnek olarak Şekil 1 &#39;de gösterilmiştir. Plazmid GFP Cad7 plazmid birlikte E6 az tectum içine electroporated zaman, iki veya üç gün elektroporasyon sonra embriyolar toplanmış ve düzeltildi. E8 de, GFP proteini kuvvetli bütün resimler montaj (Şekil 1A-C) içinde tectum cinsinden ifade edilir. Ayrıca, E9 de tectum ilgili bölümlerin,GFP protein (Şekil 1D yeşil) ve Cad7 protein (Şekil 1E kırmızı) ex ovo elektroporasyon in vivo büyük tavuk embriyo gen transferi için başarılı bir yöntem olduğunu düşündürmektedir (Şekil 1F sarı) coexpressed vardır. <img src="/files/ftp_upload/4078/4078fig1.jpg" alt="Şekil 1"/> Şekil 1. Yi kodlayan plasmidin GFP ve Cad7 E6 azından tavuk tectum içine cotransfected zaman, iki ya da üç gün ex ovo elektroporasyon sonra GFP protein (yeşil) kuvvetli olarak E8 azından wholemount görüntü (AC) &#39;de gösterildiği ifade edilir. E9 azından tectum bölümleri içinde, GFP protein (D yeşil) ve Cad7 protein (E kırmızı) (F sarı) coexpressed vardır. BF, parlak alan görüntüsü. Ölçek çubuğu: AC için A 200 mikron; DF D 100 mikron.

<ol>
	<li>Momose, T., Tonegawa, A., Takeuchi, J., Ogawa, H., Umesono, K., Yasuda, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Efficient+targeting+of+gene+expression+in+chick+embryos+by+microelectroporation.">Efficient targeting of gene expression in chick embryos by microelectroporation.</a> Dev. Growth Differ. 41, 335-344 (1999).</li><li>Luo, J., Ju, M. J., Lin, J., Yan, X., Markus, A., Mix, E., Rolfs, A., Redies, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cadherin-20+expression+by+motor+neurons+is+regulated+by+Sonic+hedgehog+during+spinal+cord+development.">Cadherin-20 expression by motor neurons is regulated by Sonic hedgehog during spinal cord development.</a> NeuroReport. 20, 365-370 (2009).</li><li>Luo, J., Ju, M. J., Redies, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Regionalized+cadherin-7+expression+by+radial+glia+is+regulated+by+Shh+and+Pax7+during+chicken+spinal+cord+development.">Regionalized cadherin-7 expression by radial glia is regulated by Shh and Pax7 during chicken spinal cord development.</a> Neuroscience. 142, 1133-1143 (2006).</li><li>Nakamura, H., Katahira, T., Sato, T., Watanabe, Y., Funahashi, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Gain-+and+loss-of-function+in+chick+embryos+by+electroporation.">Gain- and loss-of-function in chick embryos by electroporation.</a> Mech. Dev. 121, 1137-1143 (2004).</li><li>Dai, F., Yusuf, F., Farjah, G. H., Brand-Saberi, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=RNAi-induced+targeted+silencing+of+developmental+control+genes+during+chicken+embryogenesis.">RNAi-induced targeted silencing of developmental control genes during chicken embryogenesis.</a> Dev. Biol. 258, 80-90 (2005).</li><li>Rao, M., Baraban, J. H., Rajaii, F., Sockanathan, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+vivo+comparative+study+of+RNAi+methodologies+by+in+ovo+electroporation+in+the+chick+embryo.">In vivo comparative study of RNAi methodologies by in ovo electroporation in the chick embryo.</a> Dev. Dyn. 231, 592-600 (2004).</li><li>Kos, R., Tucker, R. P., Hall, R., Duong, T. D., Erickson, C. A. <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+introducing+morpholinos+into+the+chicken+embryo.">Methods for introducing morpholinos into the chicken embryo.</a> Dev. Dyn. 226, 470-477 (2003).</li><li>Hamburger, V., Hamilton, H. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+series+of+normal+stages+in+the+development+of+the+chick+embryo.">A series of normal stages in the development of the chick embryo.</a> J. Morphol. 88, 49-92 (1951).</li><li>Auerbach, R., Kubai, L., Knighton, D., Folkman, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+simple+procedure+for+the+long-term+cultivation+of+chicken+embryos.">A simple procedure for the long-term cultivation of chicken embryos.</a> Dev. Biol. 10, 391-394 (1974).</li><li>Luo, J., Treubert-Zimmermann, U., Redies, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cadherins+guide+migrating+Purkinje+cells+to+specific+parasagittal+domains+during+cerebellar+development.">Cadherins guide migrating Purkinje cells to specific parasagittal domains during cerebellar development.</a> Mol. Cell. Neurosci. 25, 138-152 (2004).</li><li>Luo, J., Redies, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ex+ovo+electroporation+for+gene+transfer+into+older+chicken+embryos.">Ex ovo electroporation for gene transfer into older chicken embryos.</a> Dev. Dyn. 233, 1470-1477 (2005).</li><li>Treubert-Zimmermann, U., Heyers, D., Redies, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Targeting+axons+to+specific+fiber+tracts+in+vivo+by+altering+cadherin+expression.">Targeting axons to specific fiber tracts in vivo by altering cadherin expression.</a> J. Neurosci. 22, 7617-7626 (2002).</li></ol>

Çıkar çatışması ilan etti.

Bu protokol ex ovo elektroporasyonla büyük tavuk embriyo (örneğin, E6 de optik tectum içine) gen transferi için bir kılavuz sağlar. Bu yöntem, büyük tavuk embriyo elektroporasyonla kullanılması uzanır ve kolay bir sonraki aşamada, in vivo gen fonksiyonu olarak incelemek için çok laboratuar uygulanabilir. E4 en az E7 için başarılı bir şekilde Embriyolar bu yöntem tarafından electroporated edilebilir ve electroporated embriyosu E15 11 kadar sağkalım olabilir. Beynin y...

<table border="1"><tbody><tr><td> Isim </td><td> Şirket </td><td> Katalog Numarası </td></tr><tr><td> Elektroporatör </td><td> Nepa Gen, Japonya </td><td> CUY21-Düzenle </td></tr><tr><td> Elektrotlar </td><td> Nepa Gen, Japonya </td><td> CUY661-3x7 </td></tr><tr><td> Kuluçka </td><td> Ehret, Almanya </td><td> BSS160 </td></tr><tr><td> Embriyo inkübatör </td><td> BINDER GmbH, Almanya </td><td></td></tr><tr><td> Floresan mikroskop </td><td> Keyence, Deutschland GmbH </td><td> BZ-8000 </td></tr><tr><td> Petri </td><td> Greiner Bio-One GmbH, Almanya </td><td></td></tr><tr><td> Mikroelektrod çektirmenin </td><td> Dünya Hassas Aletler, Almanya </td><td> PUL-100 </td></tr></tbody></table>

gene transfer into older chicken embryos by ex ovo electroporation

Tavuk embriyo embriyonik gelişim sırasında gen fonksiyonu ve regülasyonu çalışmak için mükemmel bir model sistemi sağlar. Ovo elektroporasyon içinde güçlü bir aşırı-express ekzojen genlerin yöntemi veya tavuk embriyo 1 in vivo olarak endojen genlerin aşağı düzenlenmesi. DNA plazmid kodlama genleri 2-4, küçük müdahale RNA (siRNA) plazmidleri 5, küçük sentetik RNA oligos 6 ve morfolino antisens oligonükleotidler 7 gibi farklı yapılar kolaylıkla elektroporasyonla tavuk embriyosu transfekte edilebilir. Ancak, ovo elektroporasyon yılında uygulanması erken kuluçka evrelerinde (evre HH20 daha genç - Hamburg ve Hamilton göre) az embriyo ile sınırlıdır 8 ve sonraki aşamalarında embriyo yılında uygulama için bazı dezavantajları (evre HH22 büyük var - yaklaşık 3.5 kalkınma gün). Örneğin, daha sonraki aşamalarda vitellin membran usu olanshall membran yapışmış ve kabuk bir pencere açarak müttefiki embriyoların ölümle sonuçlanan, damarların yırtılması neden olur; eski embriyolar bu embriyolar erişmek ve işlemek için zordur vitellin ve allantoik damarları ile kaplıdır; eski embriyo hareket kabuk nispeten küçük bir pencereden yönü şiddetle kontrol etmek zordur ve olup. Bu protokol; geç evrede (evre HH22 daha eski) az tavuk embriyosu gen transferi için bir ex ovo elektroporasyon yöntemi göstermektedir. Ex ovo elektroporasyon için, embriyolar Petri 9 kültüre ve vitellin ve allantoik damarları yaygın olarak yayılır. Bu koşullar altında, büyük tavuk embriyo kolayca erişilebilir ve manipüle edilmiştir. Bu nedenle, bu yöntem, daha eski tavuk embriyo uygulanan ovo elektroporasyon in bir sakıncaları ortadan kaldırmaktadır. Bu yöntemi kullanarak, plazmidler kolayca farklı bölüme transfekte edilebilirbüyük tavuk embriyo 10-12.

Watch this Scientific Journal Video about Gene Transfer into Older Chicken Embryos by ex ovo Electroporation at JoVE.com

Gene Transfer into Older Chicken Embryos by ex ovo Electroporation

Daha sonra kuluçka dönemlerinde (Hamburger ve Hamilton evresi (SS) 22 yaşından büyük) az tavuk embriyosu gen transferi yöntemi açıklanmıştır. Bu yöntem, dezavantajların üstesinden<em&gt; Ovo içinde</em&gt; Elektroporasyon büyük tavuk embriyo uygulanan ve gen fonksiyonu ve büyük gelişim aşamalarında yönetmelik çalışmak için yararlı bir tekniktir.

Tarafından Eski Tavuk Embriyolar içine Gen Transferi<em&gt; Ex ovo</em&gt; Elektroporasyon

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

gene-transfer-into-older-chicken-embryos-by-ex-ovo-electroporation

Research

JoVE Journal

Biology

Gene Transfer into Older Chicken Embryos by ex ovo Electroporation

14.5K Görüntüleme.  School of Medicine University of Rostock. Daha sonra kuluçka dönemlerinde (Hamburger ve Hamilton evresi (SS) 22 yaşından büyük) az tavuk embriyosu gen transferi yöntemi açıklanmıştır. Bu yöntem, dezavantajların üstesinden Ovo içinde Elektroporasyon büyük tavuk embriyo uygulanan ve gen fonksiyonu ve büyük gelişim aşamalarında yönetmelik çalışmak için yararlı bir tekniktir.

Video: Gene Transfer into Older Chicken Embryos by ex ovo Electroporation

Nuclear Transfer into Mouse Oocytes

Nuclear transfer into an unfertilized oocyte can restore developmental potential to a differentiated cell. This demonstrates that the processes underlying development, differentiation and aging are epigenetic rather than genetic processes. The reversibility of these processes opens exciting perspectives in basic research, and in the more distant future, in regenerative medicine. In the mouse, embryonic stem cells can be derived from cloned preimplantation stage embryos. Such embryonic stem cells have the ability to give rise to all cell types of the adult organism. Importantly, these cells are genetically identical to the donor. If applicable to human, this would allow the derivation of stem cells from a patient. These cells could then be differentiated into the affected cell type of the patient and studied in vitro, or used to replace the damaged or missing cells. The study of nuclear transfer in the mouse remains important as it can inform us about the principles of nuclear reprogramming. This movie and the accompanying protocol are intended to help learning nuclear transfer in the mouse, a method initially developed in the group of Prof. Yanagimachi (WAKAYAMA et al. 1998).

This movie and the protocol are intended to help learning nuclear transfer.

Fare Oosit içine Nükleer Transfer

Nuclear transfer into an unfertilized oocyte can restore developmental potential to a differentiated cell. This demonstrates that the processes underlying ...

Biyoloji

In Utero Intraventricular Injection and Electroporation of E16 Rat Embryos

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

E16 Rat Embriyolar Utero İntraventriküler Enjeksiyon ve Elektroporasyon

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

In Utero Intraventricular Injection and Electroporation of E15 Mouse Embryos

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

E15 Fare Embriyolar Utero İntraventriküler Enjeksiyon ve Elektroporasyon

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

Placing Growth Factor-Coated Beads on Early Stage Chicken Embryos

The neural tube expresses many proteins in specific spatiotemporal patterns during development. These proteins have been shown to be critical for cell fate determination, cell migration, and formation of neural circuits. Neuronal induction and patterning involve bone morphogenetic protein (BMP), sonic hedgehog (SHH), fibroblast growth factor (FGF), among others. In particular, the expression pattern of Fgf8 is in close proximity to regions expressing BMP4 and SHH. This expression pattern is consistent with developmental interactions that facilitate patterning in the telencephalon.

Here we provide a visual demonstration of a method in which an in ovo preparation can be used to test the effects of Fgfs in the formation of the forebrain. Beads are coated with protein and placed in the developing neural tube to provide sustained exposure. Because the procedure uses small, carefully placed beads, it is minimally invasive and allows several beads to be placed within a single neural tube. Moreover, the method allows for continued development so that embryos can be analyzed at a more mature stage to detect changes in anatomy and in neural patterning. This simple but useful protocol allows for real time imaging. It provides a means to make spatially and temporally limited changes to endogenous protein levels.

A variety of growth factors and proteins interact to induce cells to take on different cell fates during development. Here we demonstrate the use of an in ovo preparation to address possible interactions between different proteins in development by placing beads on E2.5 chick embryos.

Erken Evre Tavuk Embriyolar Büyüme Faktörü-Kaplı Boncuk yerleştirme

The neural tube expresses many proteins in specific spatiotemporal patterns during development.   These proteins have been shown to be critical for cell ...

In Ovo Electroporations of HH Stage 10 Chicken Embryos

Large size and external development of the chicken embryo have long made it a valuable tool in the study of developmental biology.  With the advent of molecular biological techniques, the chick has become a useful system in which to study gene regulation and function.  By electroporating DNA or RNA constructs into the developing chicken embryo, genes can be expressed or knocked down in order to analyze in vivo gene function.  Similarly, reporter constructs can be used for fate mapping or to examine putative gene regulatory elements.  Compared to similar experiments in mouse, chick electroporation has the advantages of being quick, easy and inexpensive.  This video demonstrates first how to make a window in the eggshell to manipulate the embryo.  Next, the embryo is visualized with a dilute solution of India ink injected below the embryo.  A glass needle and pipette are used to inject DNA and Fast Green dye into the developing neural tube, then platinum electrodes are placed parallel to the embryo and short electrical pulses are administered with a pulse generator.  Finally, the egg is sealed with tape and placed back into an incubator for further development.  Additionally, the video shows proper egg storage and handling and discusses possible causes of embryo loss following electroporation.

Chick in ovo electroporation is a technique which allows genetic manipulation of the avian embryo. Common applications of this technique include functional analysis of genes and putative enhancer elements. This video demonstrates neural tube electroporation in HH 10 chick embryos. Injection technique and proper egg handling are discussed.

HH Sahne 10 Tavuk Embriyolar Ovo Electroporations

Large size and external development of the chicken embryo have long made it a valuable tool in the study of developmental biology.  With the advent of ...

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

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

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

Hazırlık Elektroporasyon murin Kemik İliği itibaren İlköğretim Hematopoetik Hücre Kültürleri

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

Microinjection of Zebrafish Embryos to Analyze Gene Function

One of the advantages of studying zebrafish is the ease and speed of manipulating protein levels in the embryo.  Morpholinos, which are synthetic oligonucleotides with antisense complementarity to target RNAs, can be added to the embryo to reduce the expression of a particular gene product.  Conversely, processed mRNA can be added to the embryo to increase levels of a gene product.  The vehicle for adding either mRNA or morpholino to an embryo is microinjection.  Microinjection is efficient and rapid, allowing for the injection of hundreds of embryos per hour.  This video shows all the steps involved in microinjection.  Briefly, eggs are collected immediately after being laid and lined up against a microscope slide in a Petri dish.  Next, a fine-tipped needle loaded with injection material is connected to a microinjector and an air source, and the microinjector controls are adjusted to produce a desirable injection volume.  Finally, the needle is plunged into the embryo's yolk and the morpholino or mRNA is expelled.

This video shows how morpholino or mRNA can be injected into zebrafish embryos at the one-cell stage to decrease or increase the level of specific gene products during subsequent development.

Gen Fonksiyon Analiz Zebra balığı Embriyolar Mikroenjeksiyon

One of the advantages of studying zebrafish is the ease and speed of manipulating protein levels in the embryo.  Morpholinos, which are synthetic ...

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

The retina and its sole output neuron, the retinal ganglion cell (RGC), comprise an excellent model in which to examine biological questions such as cell differentiation, axon guidance, retinotopic organization and synapse formation[1]. One drawback is the inability to efficiently and reliably manipulate gene expression in RGCs in vivo, especially in the otherwise accessible murine visual pathways. Transgenic mice can be used to manipulate gene expression, but this approach is often expensive, time consuming, and can produce unwanted side effects. In chick, in ovo electroporation is used to manipulate gene expression in RGCs for examining retina and RGC development. Although similar electroporation techniques have been developed in neonatal mouse pups[2], adult rats[3], and embryonic murine retinae in vitro[4], none of these strategies allow full characterization of RGC development and axon projections in vivo. To this end, we have developed two applications of electroporation, one in utero and the other ex vivo, to specifically target embryonic murine RGCs[5, 6]. 
With in utero retinal electroporation, we can misexpress or downregulate specific genes in RGCs and follow their axon projections through the visual pathways in vivo, allowing examination of guidance decisions at intermediate targets, such as the optic chiasm, or at target regions, such as the lateral geniculate nucleus. Perturbing gene expression in a subset of RGCs in an otherwise wild-type background facilitates an understanding of gene function throughout the retinal pathway. Additionally, we have developed a companion technique for analyzing RGC axon growth in vitro. We electroporate embryonic heads ex vivo, collect and incubate the whole retina, then prepare explants from these retinae several days later. Retinal explants can be used in a variety of in vitro assays in order to examine the response of electroporated RGC axons to guidance cues or other factors. In sum, this set of techniques enhances our ability to misexpress or downregulate genes in RGCs and should greatly aid studies examining RGC development and axon projections.

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

Here we present two techniques for manipulating gene expression in murine retinal ganglion cells (RGCs) by in utero and ex vivo electroporation. These techniques enable one to examine how alterations in gene expression affect RGC development, axon guidance, and functional properties.

Fare Retina Ganglion Hücreleri Gen İfadesi utero ve ex vivo Elektroporasyon

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

Chick ex ovo Culture and ex ovo CAM Assay: How it Really Works

Chicken eggs in the early phase of breeding are between in vitro and in vivo systems and provide a vascular test environment not only to study angiogenesis but also to study tumorigenesis. After the chick chorioallantoic membrane (CAM) has developed, its blood vessel network can be easily accessed, manipulated and observed and therefore provides an optimal setting for angiogenesis assays. Since the lymphoid system is not fully developed until late stages of incubation, the chick embryo serves as a naturally immunodeficient host capable of sustaining grafted tissues and cells without species-specific restrictions. In addition to nurturing developing allo- and xenografts, the CAM blood vessel network provides a uniquely supportive environment for tumor cell intravasation, dissemination, and vascular arrest and a repository where arrested cells extravasate to form micro metastatic foci.
For experimental purposes, in most of the recent studies the CAM was exposed by cutting a window through the egg shell and experiments were carried out in ovo, resulting in significant limitations in the accessibility of the CAM and possibilities for observation and photo documentation of effects. When shell-less cultures of the chick embryo were used1-4, no experimental details were provided and, if published at all, the survival rates of these cultures were low. We refined the method of ex ovo culture of chick embryos significantly by introducing a rationally controlled extrusion of the egg content. These ex ovo cultures enhance the accessibility of the CAM and chick embryo, enabling easy in vivo documentation of effects and facilitating experimental manipulation of the embryo. This allows the successful application to a large number of scientific questions: (1) As an improved angiogenesis assay5,6, (2) an experimental set up for facilitated injections in the vitreous of the chick embryo eye7-9, (3) as a test environment for dissemination and intravasation of dispersed tumor cells from established cell lines inoculated on the CAM10-12, (4) as an improved sustaining system for successful transplantation and culture of limb buds of chicken and mice13 as well as (5) for grafting, propagation, and re-grafting of solid primary tumor tissue obtained from biopsies on the surface of the CAM14.
In this video article we describe the establishment of a refined chick ex ovo culture and CAM assay with survival rates over 50%. Besides we provide a step by step demonstration of the successful application of the ex ovo culture for a large number of scientific applications. 
Daniel S. Dohle, Susanne D. Pasa, and Sebastian Gustmann contributed equally to this study.

Chick ex ovo Culture and ex ovo CAM Assay: How it Really Works

The chick chorioallantoic membrane (CAM) is a unique, naturally immunodeficient supportive culture environment to study angiogenesis and tumorigenesis. This video article demonstrates the different steps in chick ex ovo culture, application of potentially angiogenic substances and successful inoculation of tumor cells and tissues on the surface of the CAM.

Civciv Ex ovo Kültür ve Ex ovo CAM Testi: Gerçekten Nasıl Çalışır?

Chicken eggs in the early phase of breeding are between in vitro and in vivo systems and provide a vascular test environment not only to study ...

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

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

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

Tarafından Eski Tavuk Embriyolar içine Gen Transferi

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