Enhanced Episome Vectors (EEV)

Enhanced Episome Vectors (EEV)
Enhanced Episome Vectors (EEV)
. EEVxxxA-1
Cat #s
User Manual
System Biosciences (SBI)
265 North Whisman Rd.
Mountain View, CA 94043
888.266.5066 (Toll Free in US)
E-mail: [email protected]
Web: www.systembio.com
Store at -20ºC upon arrival
A limited-use label license covers this
product. By use of this product, you
accept the terms and conditions outlined
in the Licensing and Warranty Statement
contained in this user manual.
EEV Episomal Vector System
Cat. #s EEV6xxA-1
Introduction ..............................................................................1
Enhanced Episomal Vectors (EEV) Overview ....................2
EEV Applications and Vector Formats ................................3
EEV Reporters and Sample Data ............................................5
Constitutive and Inducible EEV Reporter Construct Maps .5
Sample EEV Reporter Expression Data .............................6
Product Information and Protocols.....................................12
Frequently Asked Questions ..............................................13
References .........................................................................14
Technical Support ..............................................................14
Licensing and Warranty information ..................................15
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Enhanced Episomal Vectors (EEV) Overview
For many years, expression vectors have been used as tools for
providing transgenic information into mammalian cultured cells
and therapeutic studies. For example, reprogramming factors were
shown to be delivered through retroviral transduction in cells,
allowing any somatic cell to differentiate, much like human ES
cells. However, viral transduction systems have many challenges
for in vivo studies due to potential for random integration and
To avoid the challenges of viral transduction systems, nonviral,
non-integrating plasmid-based expression and reprogramming
vectors such as those based on the Epstein-Barr Nuclear Antigen1 (oriP-EBNA1) have been developed. They have been validated
to efficiently reprogram fibroblasts into induced Pluripotent Stem
Cells (iPSCs) without integrating or modifying the host’s genome
(SBI’s catalog # SC900A-1). The major distinguishing feature of
the EBNA system from viral or other plasmid-based approaches is
its ability to replicate in synchrony with the host genome by
attaching to the host chromatin and replicate with each cell cycle
division. This results in an extended presence within a host cell.
The target gene to be expressed (such as a reporter or iPSC
reprogramming factors) can be expressed in the same plasmid as
the oriP-EBNA1 factor for sustained transgene expression. Over
time, these episomal plasmids are naturally lost at a rate of 5% per
cell cycle division due to plasmid dilution, promoter silencing, and
vector replication errors. Since most of the plasmid is lost over
time, cell lines can then be established without any risk of genomic
integration or alterations. SBI has developed an enhanced version
of the oriP-EBNA1 technology called the Enhanced Episomal
Vector (EEV) platform. This new technology enables sustained
transgene expression for several months in both in vitro and in
vivo applications. The mechanism of how the EEV technology
works is shown in the next schematic.
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EEV Applications and Vector Formats
EEV vectors are a non-viral and non-integrating system for
sustained transgene expression in cells. The built-in oriP-EBNA1
gene in these vectors allows these plasmids to be replicated and
partitioned to daughter cells. As a result, this EEV system is
optimized to be expressed in cell culture and in vivo animal
models for up to 6 weeks The EEV platform has been utilized by
SBI to rapidly and efficiently reprogram somatic cells into iPSCs –
for additional information, please see product description for SBI’s
Episomal iPSC Reprogramming Plasmids, cat# SC900A-1. The
EEV system is optimal for researchers looking for a non-viral, nonintegrating system to provide long-term, stable transgene
expression in target cells or tissues, and offers clear advantages
over both viral and traditional plasmid-based expression systems.
Highlights of the EEV System
 Easy to clone format, no special plasmid production
 Nonviral, non-integrating technology
 Persistent, sustained transgene expression
 Powerful CAGs promoter for constitutive, high level
transgene expression in all mammalian cell types,
including primary and stem cells
 Tight, inducible Cumate Switch format available
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EEV Cloning Vector Formats
SBI has built two formats of EEV cloning and expression vectors
to build your own constructs. The first features a potent CAGs
promoter driving constitutive transgene expression (Cat#
EEV600A-1). The second is an inducible EEV expression vector
that features the ultra-tight cumate inducible system in an all-inone format (catalog# EEV610A-1). Both vector formats feature a
Multiple Cloning Site (MCS) to insert a cDNA, microRNA, etc.
sequence into the EEV vector as well as the EBV oriP origin and
the EBNA1 factor for propagating the episome for sustained
transgene expression. The available cloning and expression EEV
vector formats are shown below.
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EEV Reporters and Sample Data
A. Constitutive and Inducible EEV Reporter
Construct Maps
SBI has built EEV reporter plasmids featuring a GFP-T2ALuciferase expression cassette for reporting sustained transgene
expression in a constitutive format (cat# EEV604A-1) or as an allin-one cumate inducible format (cat# EEV605A-1). The construct
plasmid maps are depicted below.
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B. Sample EEV Reporter Expression Data
EEV in vitro applications
The constitutive EEV reporter construct cat# EEV604A-1 was
transfected into HEK293T cells and the GFP transgene expression
monitored over a period of several weeks. HEK293T cells in a 24well culture dish were transfected once with 0.5 ug of EEV604A-1
reporter plasmid DNA. Cell images from 2 days and 11 days after
transfections are shown below.
The cumate inducible EEV reporter construct (cat# EEV605A-1)
features a cumate-inducible promoter driving the expression of
GFP-T2A-Luciferase as well as a constitutive EF1 promoter
expressing the CymR cumate promoter repressor and a
Puromycin selection cassette. HEK293 cells were transfected with
EEV605A-1. Cells were cultured with DMEM supplemented with
10% FBS. The EEV605A-1 cumate switch inducible reporter
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should be silent until the addition of the inducer cumate solution
(Cat# QM150A-1, 1000x concentration). Cumate was added at 1x
concentration from the 1000x stock daily at a final concentration in
the medium of 30mg/ml and cells imaged for GFP induction. The
GFP induction appeared after 2 days and then expression was
detected for 72 days (2.5 months) after the original transfection
under 2 ug/ml puromycin selection. The GFP induction data for the
no cumate and the 11 and 72 day expression data are shown in
the next Figure.
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The expression activity of the EEV605A-1 reporter plasmid upon
cumate induction can also be monitored in living cells for
luciferase expression. Simply add D-luciferin to the cell media for
2-3 minutes and image the cells for luminescence. An example is
shown below of a 6-well dish of HEK293T cells transfected with
EEV605A-1 as well as control untransfected cells. Both conditions
then were either treated with 1x cumate solution or no cumate.
Cells were subcultured in cumate for 27 days and imaged for 120
seconds to detect luminescence using a Bio-Rad Chemi-doc
system. The resulting cumate induction data in living cells with the
EEV605A-1 reporter are shown in the next Figure.
EEV in vivo applications
The constitutive EEV604A-1 CAGs-GFP-T2A-Luciferase construct
(8 ug plasmid DNA) was introduced into test mice through
hydrodynamic tail vein injection (HDD). This procedure leads to
high plasmid DNA transfection of the livers of mice in vivo. The
test mice (n=3) were imaged for body luminescence in the liver
area post HDD from Day 1 up until Day 80. The results show that
robust EEV luciferase expression is readily detectable at very high
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levels through Day 40. Luciferase quantitative data for the test
mice in graphical form as well as bioluminescent animal imaging
data are shown in the next Figure.
There are some popular episomal expression technologies
available for sustained expression in vivo, such as the Minicircle
DNA system (Mark A. Kay, et al., Nat Biotechnol. 2010
Dec;28(12):1287-9 and Mini-Intronic Platform (Lu J, et al., Mol
Ther. 2013 May;21(5):954-63). These two different episomal
technology platforms were compared against the EEV system
using a mouse IL-23 cDNA followed by HDD injection with
subsequent monitoring of secreted mIL-23 protein levels in the
serum of test mice. Two different amounts of either minicircle,
mini-intronic platform or EEV plasmid DNA expressing the mIL-23
gene were utilized for these cross-comparison studies. Serum
levels of mIL-23 expression were quantitated using a murine IL-23
ELISA assay 7 days after HDD injection of the various plasmid
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The EEV construct map of the mIL-23 EEV expression construct
cloned into EEV600A-1 and the mIL-23 serum expression data are
shown above. The EEV technology outperformed the other
episomal platforms by at least 10-fold over the course of these
studies up to 21 days post-HDD injection (not shown). This
demonstrates the ability of the EEV platform to provide sustained,
long-lasting transgene expression which is critical for endpoint
studies requiring weeks or even months of transgene expression.
The Cumate inducible EEV605A-1 reporter was also tested in
mice. The EEV605A-1 CuO-GFP-T2A-Luciferase plasmid was
introduced into test mice (n=3) by using 5 ug plasmid and the HDD
injection procedure on Day 0. The water-soluble version of the
inducer cumate compound (cat# QM150A-1) was injected by IP
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(1.5 mg) per animal to induce EEV expression. The mice were
then imaged for luminescence activity through full body scans and
liver expression levels quantitated from Day 2 through Day 10.
The experimental setup is depicted below.
The controls for the experiments included a naïve, no plasmid
DNA control, as well as EEV605A-1 injected mice (n=3) without
the addition of cumate. The results for the Day 2 measurements
are shown in the next figure.
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Product Information and Protocols
Product Format, Storage, Stability and Availability
EEV plasmids are shipped at a concentration of 0.5 ug/uL with 20
ug total. All plasmids are shipped in dry ice or blue ice and should
be stored at -20°C upon receipt. Properly stored plasmids are
stable for 12 months from the date received.
Building EEV expression constructs
Standard molecular cloning techniques to insert the cDNA,
microRNA, etc. of interest can be used and placed into the MCS of
the EEV cloning and expression vector. Typical ampicillin-based
plates and liquid media can be used to identify successful clones
and propagate the EEV plasmids.
Transfection of EEV vectors in Tissue Culture
For 293 FT cells in a 24-well plate format:
 One day prior to transfection, seed 1.0 x 10^5 cells/well in
a 24-well plate
 Cells should be 60-80% confluent on day of transfection.
Replace cells with fresh new media at least 2 hours prior
to transfection.
Transfection method (recommended)
1. Per 24-well to be transfected:
2. First dilute 0.5 ug EEV plasmid in 100 uL Dilution media
(Serum-Free), then mix well.
3. Add 2-3 uL of Lipofectamine LTX reagent and mix by
gently flicking the tube and spin down briefly.
4. Incubate at 25°C for at least 30 minutes.
5. Then take 100 uL of transfection mix and add drop-wise to
the cells.
6. Let plasmid express for 24-72 hours.
Establishing EEV cell lines
 EEV600A-1 and EEV604A-1 are constitutive promoters
which allow sustained expression of EEV plasmids and
target gene for at least 6 weeks.
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EEV610A-1, EEV605A-1 are inducible systems that have
a cumate promoter and a puromycin marker for selecting
and establishing cell lines.
EEV604A-1 and EEV605A-1 also feature a GFP-T2ALuciferase reporter to monitor expression of EEV both invitro and in-vivo animal studies.
Frequently Asked Questions
Q. What is the cDNA maximum size that can be expressed
from an EEV plasmid?
Although the insert size limits have not been thoroughly tested, we
have had success in expressing up to a 12 kb insert at high levels
using the EEV system.
Q. Will the EEV plasmids work in Human, Mouse and Rat
Yes, the EBNA1 and oriP vector technologies will work in most
mammalian cells and tissue types.
Q. How can I control/reduce the expression level of my cloned
cDNA in an EEV plasmid?
If your cDNA is cloned into the constitutive expression plasmid
(cat# EEV600A-1), then simply titrate down the amount of EEV
construct DNA you use for cell transfections and/or animal
injection studies. Alternatively, you can use the cumate inducible
EEV format (cat# EEV610A-1) and titrate in the amount of cumate
added to achieve the desired expression level.
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Daramola O, Stevenson J, Dean G, Hatton D, Pettman G, Holmes
W, Field R. A high-yielding CHO transient system: coexpression of
genes encoding EBNA-1 and GS enhances transient protein
expression. Biotechnol Prog. 2014 Jan-Feb;30(1):132-41.
John L. Yates, Noreen Warren & Bill Sugden. Stable replication of
plasmids derived from Epstein–Barr virus in various mammalian
cells. Nature 313, 812 - 815 (28 February 1985);
Mark A. Kay, Cheng-Yi He & Zhi-Ying Chen. A robust system for
production of minicircle DNA vectors. Nat Biotechnol. 2010
Lu J, Zhang F, Kay MA.A mini-intronic plasmid (MIP): a novel
robust transgene expression vector in vivo and in vitro. Mol Ther.
2013 May;21(5):954-63.
Technical Support
For more information about SBI products and to download
manuals in PDF format, please visit our web site:
For additional information or technical assistance, please call or
email us at:
System Biosciences (SBI)
265 North Whisman Rd.
Mountain View, CA 94043
Phone: (650) 968-2200
(888) 266-5066 (Toll Free)
Fax: (650) 968-2277
General Information: [email protected]
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Cat. #s EEV6xxA-1
Technical Support: [email protected]
Ordering Information: [email protected]
Licensing and Warranty information
Please note the following Licensing Restrictions:
For Academic and Non-Profit Institutions:
Researchers at academic and non-profit institutes are granted full
access to purchasing the EEV cloning vectors and reporters. Full
sequence information is provided upon proof of purchase of EEV
Please contact SBI’s technical support at
[email protected] for sequence information
For Commercial Customers:
For-profit and commercial customers can purchase the pre-made
EEV reporters (EEV604A-1, EEV605A-1); however, due to
licensing restrictions, cloning EEV vectors (e.g. EEV600A-1 and
EEV610A-1) are not available for purchase unless a custom EEV
construct is purchased as part of a custom service. SBI then
provides the commercial customer with the desired amount of
ready-to-use EEV custom construct DNA.
Limited Use License
Use of the EEV vector system (i.e., the “Product”) is subject to the
following terms and conditions. If the terms and conditions are not
acceptable, return all components of the Product to System
Biosciences (SBI) within 7 calendar days. Purchase and use of
any part of the Product constitutes acceptance of the above terms.
The purchaser of the Product is granted a limited license to use
the Product under the following terms and conditions:
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The Product shall be used by the purchaser for internal
research purposes only. The Product is expressly not
designed, intended, or warranted for use in humans or for
therapeutic or diagnostic use.
The Product may not be resold, modified for resale, or
used to manufacture commercial products without prior
written consent of SBI.
This Product should be used in accordance with the NIH
guidelines developed for recombinant DNA and genetic
Purchase of the product does not grant any rights or license for
use other than those explicitly listed in this Licensing and Warranty
Statement. Use of the Product for any use other than described
expressly herein may be covered by patents or subject to rights
other than those mentioned. SBI disclaims any and all
responsibility for injury or damage which may be caused by the
failure of the buyer or any other person to use the Product in
accordance with the terms and conditions outlined herein.
Limited Warranty
SBI warrants that the Product meets the specifications described
in this manual. If it is proven to the satisfaction of SBI that the
Product fails to meet these specifications, SBI will replace the
Product or provide the purchaser with a credit. This limited
warranty shall not extend to anyone other than the original
purchaser of the Product. Notice of nonconforming products must
be made to SBI within 30 days of receipt of the Product.
SBI’s liability is expressly limited to replacement of Product or a
credit limited to the actual purchase price. SBI’s liability does not
extend to any damages arising from use or improper use of the
Product, or losses associated with the use of additional materials
or reagents. This limited warranty is the sole and exclusive
warranty. SBI does not provide any other warranties of any kind,
expressed or implied, including the merchantability or fitness of the
Product for a particular purpose.
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SBI is committed to providing our customers with high-quality
products. If you should have any questions or concerns about any
SBI products, please contact us at (888) 266-5066.
© 2015 System Biosciences (SBI), All Rights Reserved.
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