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Viral Transduction

Products >  Viral_Transduction >  Lentiviral_Vector_Systems >  Constitutive_Promoter

Lentiviral Vector Systems for Constitutive Gene Expression

Clontech’s Lenti-X lentiviral expression systems are highly effective gene delivery systems that can be used with almost any mammalian cell type, including dividing and nondividing cells, primary cell cultures, stem cells, and neurons.

Lentiviral Vector Design

All of Clontech's lentiviral vectors contain HIV-1-derived sequences (LTRs, packaging signal, and RRE) for efficient lentivirus production and replication, and include the following additional elements that improve titers and transgene expression.

  • WPRE—The woodchuck hepatitis virus posttranscriptional regulatory element facilitates effective transcription termination at the 3’ LTR. It provides a two-fold benefit in that it elevates both the level of functional viral genomic RNA in 293T packaging cells, and the level of mature transgene mRNA in transduced target cells
  • cPPT/CTS—The central polypurine tract/central termination sequence element increases creates a central “DNA flap” that increases nuclear importation of the viral genome during target cell infection. This results in improved vector integration and greater transduction efficiency.

Biscistronic Options

The IRES Vectors included with the bicistronic lentiviral expression systems each contain a multiple cloning site located upstream of the IRES from which a selection marker is expressed. Because your gene of interest and a selection marker are translated from a single RNA, you can be certain that nearly 100% of the colonies that are resistant to puromycin, hygromycin, and G418 also express your protein of interest.

Fluorescent Protein Options

For lentiviral vectors that express fluorescent protein tags and markers, including the bicistronic pLVX-IRES-ZsGreen1 and pLVX-IRES-mCherry vectors, see our Fluorescent Lentiviral Expression Vectors webpage.

EF1 Alpha Promoter Versions

Lenti-X lentiviral vector systems with EF-1 alpha promoters allow you to achieve robust, constitutive, long-term expression of your gene of interest in cell types in which CMV promoters are often silenced, such as hematopoietic and stem cells.

Lentiviral Packaging System Included

Many of Clontech's lentiviral systems are complete systems that include our high titer Lenti-X Packaging Single Shots (VSV-G), when used with the Lenti-X 293T Cell Line (not included), generates titers that are far superior to those of other commercially available lentiviral packaging systems. Frequently, an entire dish of target cells can be effectively transduced using just 10–100 µl of unconcentrated viral supernatant.

  At-A-Glance   Documents   Images & Data   Resources


  • Complete systems include a high titer lentiviral packaging system and an optimized transfer vector
  • Vector design optimized for high expression and high titers
    • cPPT element enhances transduction efficiency
    • WPRE enhances expression of your transgene, and increases viral titer
  • EF-1 alpha promoter versions for cell types where CMV promoter may be silenced
  • IRES-containing bicistronic vectors allow the simultaneous expression of your gene and a drug selection marker from the same RNA transcript

Additional Information

Please see the product's Certificate of Analysis for information about storage conditions, product components, and technical specifications. Please see the Kit Components List to determine kit components. Certificates of Analysis and Kit Components Lists are located under the Documents tab.

Cat. # Product Contents Size Price License Units Select
632182 Lenti-X™ Bicistronic Expression System (Hyg) Each $1,096.00 License Statements
632181 Lenti-X™ Bicistronic Expression System (Neo) Each $1,096.00 License Statements
632183 Lenti-X™ Bicistronic Expression System (Puro) Each $1,096.00 License Statements
632164 Lenti-X™ Expression System Each $1,096.00 License Statements
631253 Lenti-X™ Expression System (EF1alpha Version) Each $1,096.00 License Statements


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