Name: fast and efficient expression of multiple proteins in avian embryos using mrna electroporation
Uploaded: 2019-06-07T14:30:00
Description: Watch this Scientific Journal Video about Fast and Efficient Expression of Multiple Proteins in Avian Embryos Using mRNA Electroporation at JoVE.com

We thank David Huss for helpful insights into this work. This work was supported in part by the Rose Hills Foundation Summer Research Fellowship (2016-2018) and USC Provost&#8217;s Undergrad Research Fellowship to M.T., the Saban Research Institute Intramural Training Pre-Doctoral Award to M.D., and the University of Southern California Undergraduate Research Associates Program award to R.L.

All animal procedures were carried out in accordance with approved guidelines from the Children&#8217;s Hospital Los Angeles and the University of Southern California Institutional Animal Care and Use Committees.
1. Generation pCS2-based Expression Vectors
<ol>
	<li>To clone pCS2.Lifeact-eGFP, prepare the vector backbone by digesting 2 &#181;g of pCS2.CycB1-GFP (a construct containing a different insert) with BamHI (10 U) and BsrGI (10 U) in appropriate digestion buffer (see Table of...

<ol>
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In this protocol, we provided step by step instructions on how to precisely microinject and electroporate mRNA into the cells of gastrulating quail embryos. We demonstrated that in vitro synthesized mRNA electroporation allows fast and efficient expression of fluorescent proteins (FPs) in gastrulating quail embryos (Figure 2 and 3). Fluorescence from H2B-citrine protein translated from electroporated mRNAs could be detected by confocal microscopy within ~20 min and increased...

Electroporation is a physical transfection method that uses an electrical pulse to create transient pores in the plasma membrane, allowing substances like nucleic acids or chemicals to pass into the cytosol. Electroporation is widely used to deliver DNA into bacteria, yeast, plants, and mammalian cells1,2,3. It is routinely used to introduce genetic payloads into target cells and tissues within the developing avian embryo to study the genetic control of development or label migrating populations of cells4,5,6,7. However, several experimental limitations also exist with DNA electroporation8. For instance, DNA electroporation often introduces highly variable numbers of expression vectors per cell and subsequently the mRNAs and proteins they encode. This variability can lead to considerable cell-cell heterogeneity that complicates both image analysis and data interpretation9,10. Additionally, proteins from DNA electroporation only begin to express ~3 h post-electroporation and do not reach the maximum efficiency in cell number and fluorescence intensity until 12 h, likely due to the time required to transfer into the nucleus and complete both transcription and translation in vivo11.
In contrast, mRNA transfection has been effectively used in a variety of model systems, including Xenopus laevis oocytes by microinjection12,13, reprogramming human stem cells by mRNA lipofectamine transfection14, and electroporating recalcitrant neural stem cells in adult mice15. We tested the ability of mRNA electroporation to efficiently label cells during early avian embryonic development using in vitro synthesized mRNAs that encode distinct fluorescent proteins (FPs). For our studies, we used the pCS2+ vector, a multipurpose expression vector that is commonly used for expressing proteins in Xenopus and zebrafish embryos. The SP6 and T7 RNA polymerase promoters in the pCS2+ permit the synthesis of mRNA and protein&#160;from any cloned gene when used in an&#160;in vitro&#160;transcription/translation system.
Here, we demonstrate that mRNA electroporation allows fast and efficient expression of fluorescent proteins (FPs) in gastrulating quail embryos. We designed and generated many of the expression vectors used in these studies. For example, we subcloned the LifeAct-eGFP gene16 into the pCS2+ vector17 to express from the CMV promoter and SP6 promoter. The inserted gene lies downstream of the SP6 promoter and upstream of the SV40 poly(A) tail18. In embryos co-electroporated with mRNA and DNA, FPs encoded from in vitro transcribed mRNAs were first detected within 20 min of electroporation, whereas FPs from DNA expression vectors were detected only after 3 h. Multiple mRNAs encoding for nuclear, Golgi, and membrane proteins can be electroporated into an embryo simultaneously, resulting in the quick and efficient expression of multiple proteins in individual cells. Finally, using an in vivo fluorescence recovery after photobleaching (FRAP) assay, we show that a majority of the electroporated mRNAs decay within 2 h. Thus, fast initial protein production combined with limited new protein translation makes mRNA electroporation a valuable technique when temporal control of expression is necessary.

<table>
	<tbody>
		<tr>
			<td>BamHI-HF</td>
			<td>New England Biolabs</td>
			<td>R3136L</td>
			<td></td>
		</tr>
		<tr>
			<td>BglII</td>
			<td>New England Biolabs</td>
			<td>R0144S</td>
			<td></td>
		</tr>
		<tr>
			<td>BsrG1-HF</td>
			<td>New England Biolabs</td>
			<td>R3575S</td>
			<td></td>
		</tr>
		<tr>
			<td>NotI-HF</td>
			<td>New England Biolabs</td>
			<td>R3189L</td>
			<td></td>
		</tr>
		<tr>
			<td>SalI-HF</td>
			<td>New England Biolabs</td>
			<td>R3138L</td>
			<td></td>
		</tr>
		<tr>
			<td>Phenol:Chloroform:Isoamyl Alcohol</td>
			<td>Thermo Fisher</td>
			<td>15593031</td>
			<td></td>
		</tr>
		<tr>
			<td>SP6 mMessage Machine in vitro transcription kit</td>
			<td>Thermo Fisher</td>
			<td>AM1340</td>
			<td></td>
		</tr>
		<tr>
			<td>Fast Green FCF</td>
			<td>Sigma Aldrich</td>
			<td>F7252</td>
			<td></td>
		</tr>
		<tr>
			<td>Triton X-100</td>
			<td>Sigma Aldrich</td>
			<td>93443</td>
			<td>4-(1,1,3,3-Tetramethylbutyl)phenyl-polyethylene glycol, t-Octylphenoxypolyethoxyethanol, Polyethylene glycol tert-octylphenyl ether</td>
		</tr>
		<tr>
			<td>DAPI</td>
			<td>Sigma Aldrich</td>
			<td>D9542</td>
			<td>2-(4-Amidinophenyl)-6-indolecarbamidine dihydrochloride, 4&#8242;,6-Diamidino-2-phenylindole dihydrochloride, DAPI dihydrochloride</td>
		</tr>
		<tr>
			<td>Whatman No.1 filter paper</td>
			<td>Sigma Aldrich</td>
			<td>WHA1001125</td>
			<td></td>
		</tr>
		<tr>
			<td>glycerol</td>
			<td>Sigma Aldrich</td>
			<td>G9012</td>
			<td></td>
		</tr>
		<tr>
			<td>Urea</td>
			<td>Sigma Aldrich</td>
			<td>51457</td>
			<td></td>
		</tr>
		<tr>
			<td>pmTurquoise2-Golgi</td>
			<td>Addgene</td>
			<td>36205</td>
			<td>pmTurquoise2-Golgi was a gift from Dorus Gadella (Addgene plasmid # 36205 ; http://n2t.net/addgene:36205 ; RRID:Addgene_36205)</td>
		</tr>
		<tr>
			<td>pmEGFP-N1-LifeAct</td>
			<td></td>
			<td></td>
			<td>Nat. Methods 2008;5:605-7. PubMed ID: 18536722</td>
		</tr>
		<tr>
			<td>pCS2.Lifeact-mGFP</td>
			<td>Addgene</td>
			<td></td>
			<td>This paper</td>
		</tr>
		<tr>
			<td>pCS.H2B-citrine</td>
			<td>Addgene</td>
			<td>53752</td>
			<td>pCS-H2B-citrine was a gift from Sean Megason (Addgene plasmid # 53752 ; http://n2t.net/addgene:53752 ; RRID:Addgene_53752)</td>
		</tr>
		<tr>
			<td>pCS.memb-mCherry</td>
			<td>Addgene</td>
			<td>#53750</td>
			<td>pCS-memb-mCherry was a gift from Sean Megason (Addgene plasmid # 53750 ; http://n2t.net/addgene:53750 ; RRID:Addgene_53750)</td>
		</tr>
		<tr>
			<td>Zeiss LSM-780 inverted microscope</td>
			<td>Carl Zeiss Microscopy GmbH</td>
			<td></td>
			<td>The LSM-780 is a confocal and multi-photon microscope that offers the sensitivity required for vital imaging work. Equipped with a motorized stage, an autofocus device, and a full stage-top blackout incubator, the 780 is an excellent microscope for high-end live cell/embryo imaging. The high-sensitivity 32-channel Quasar detector allows for spectral imaging, linear unmixing, and high color count (&#62;4) image acquisition. Excitation can be performed with 6 lines single photon lasers (405, 458, 488, 514, 564 and 633 nm), Chameleon (Coherent) 2-photon laser (range from 690nm to 1000nm), and run with ZEN 2011 SP7 (Black) system software.</td>
		</tr>
		<tr>
			<td>CUY-21 EDIT in vivo electroporator</td>
			<td>Bex Co., Ltd.</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Platinum flat square electrode, side length 5 mm</td>
			<td>Bex Co., Ltd.</td>
			<td>LF701P5E</td>
			<td></td>
		</tr>
		<tr>
			<td>Olympus MVX10 FL Stereo Microscope</td>
			<td>Olympus LifeScience</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>XM10 Monochrome camera</td>
			<td>Olympus LifeScience</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Phosphate-Buffered Saline (PBS) for HCR (10&#215;, pH 7.4) </td>
			<td></td>
			<td></td>
			<td>To prepare 1 L of a 10&#215; stock solution, combine 80 g of NaCl (Sigma-Aldrich S3014), 2 g of KCl (Sigma-Aldrich P9541), 11.4 g of Na2HPO4 (anhydrous; Sigma-Aldrich S3264), and 2.7 g of KH2PO4 (anhydrous; Sigma-Aldrich P9791). Adjust the pH to 7.4 with HCl, and bring the final volume to 1 L with ultrapure H2O. Avoid using CaCl2 and MgCl2 in PBS for HCR. It is important that the PBS for HCR is prepared as an RNase-free solution (e.g., via diethylpyrocarbonate [DEPC] treatment).</td>
		</tr>
		<tr>
			<td>1.37 M NaCl</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>27 mM KCl</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>80 mM Na2HPO4 20 mM KH2PO4</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>PBS/Triton</td>
			<td></td>
			<td></td>
			<td>Add 1 mL of Triton X-100 (Sigma Aldrich 93443) and 100 mL of 10&#215; PBS to 890 mL of ultrapure distilled H2O. Filter the solution through a 0.2-&#956;m filter and store it at 4 &#778;C until use.</td>
		</tr>
		<tr>
			<td>1&#215; phosphate-buffered saline (PBS) (DEPC-treated; pH 7.4)</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>0.1% Triton X-100</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
	</tbody>
</table>

fast and efficient expression of multiple proteins in avian embryos using mrna electroporation

We report that mRNA electroporation permits fluorescent proteins to label cells in living quail embryos more quickly and broadly than DNA electroporation. The high transfection efficiency permits at least 4 distinct mRNAs to be co-transfected with ~87% efficiency. Most of the electroporated mRNAs are degraded during the first 2 h post-electroporation, permitting time-sensitive experiments to be carried out in the developing embryo. Finally, we describe how to dynamically image live embryos electroporated with mRNAs that encode various subcellular targeted fluorescent proteins.

mRNA electroporation is more efficient than DNA electroporation
We used pCS2+.H2B-Citrine to prepare in vitro transcribed mRNA. Since DNA electroporation is usually performed at 1-2 &#181;g/&#181;L, we used an equimolar concentration of mRNA (calculated to be around 0.25-0.5 &#181;g/&#181;L for H2B-Citrine) for mRNA electroporation. We first tested the electroporation efficiency of pCS2+.H2B-Citrine DNA compared...

Watch this Scientific Journal Video about Fast and Efficient Expression of Multiple Proteins in Avian Embryos Using mRNA Electroporation at JoVE.com

Fast and Efficient Expression of Multiple Proteins in Avian Embryos Using mRNA Electroporation

We report messenger RNA (mRNA) electroporation as a method that permits fast and efficient expression of multiple proteins in the quail embryo model system. This method can be used to fluorescently label cells and record their in vivo movements by time-lapse microscopy shortly after electroporation.

We report that mRNA electroporation permits fluorescent proteins to label cells in living quail embryos more quickly and broadly than DNA electroporation. ...

Research

JoVE Journal

Developmental Biology

Efficient Gene Transfer in Chick Retinas for Primary Cell Culture Studies: An Ex-ovo Electroporation Approach

Efficient Gene Transfer in Chick Retinas for Primary Cell Culture Studies: An Ex-ovo Electroporation Approach

The cone photoreceptor-enriched cultures derived from embryonic chick retinas have become an indispensable tool for researchers around the world studying ...

Expression of Fluorescent Proteins in Branchiostoma lanceolatum by mRNA Injection into Unfertilized Oocytes

Expression of Fluorescent Proteins in Branchiostoma lanceolatum by mRNA Injection into Unfertilized Oocytes

We report here a robust and efficient protocol for the expression of fluorescent proteins after mRNA injection into unfertilized oocytes of the ...

Whole Retinal Explants from Chicken Embryos for Electroporation and Chemical Reagent Treatments

The retina is a good model for the developing central nervous system. The large size of the eye and most importantly the accessibility for experimental ...

Quantitative Analysis of Protein Expression to Study Lineage Specification in Mouse Preimplantation Embryos

This protocol presents a method to perform quantitative, single-cell in situ analyses of protein expression to study lineage specification in mouse ...

Tracing Gene Expression Through Detection of &#946;-galactosidase Activity in Whole Mouse Embryos

Tracing Gene Expression Through Detection of ÃƒÆ’Ã…Â½Ãƒâ€šÃ‚Â²-galactosidase Activity in Whole Mouse Embryos

The Escherichia coli LacZ gene, encoding &#946;-galactosidase, is largely used as a reporter for gene expression and as a tracer in cell lineage studies. ...

Visualizing the Node and Notochordal Plate In Gastrulating Mouse Embryos Using Scanning Electron Microscopy and Whole Mount Immunofluorescence

The post-implantation mouse embryo undergoes major shape changes after the initiation of gastrulation and morphogenesis. A hallmark of morphogenesis is ...

Light-Induced GFP Expression in Zebrafish Embryos using the Optogenetic TAEL/C120 System

Inducible gene expression systems are an invaluable tool for studying biological processes. Optogenetic expression systems can provide precise control ...

In Ovo Intravascular Injection in Chicken Embryos

In Ovo Intravascular Injection in Chicken Embryos

As a classical model system of embryo biology, the chicken embryo has been used to investigate embryonic development and differentiation. Delivering ...

Rapid and Efficient Spatiotemporal Monitoring of Normal and Aberrant Cytosine Methylation within Intact Zebrafish Embryos

Cytosine methylation is highly conserved across vertebrate species and, as a key driver of epigenetic programming and chromatin state, plays a critical ...