Lentiviral Vectors for Gene Therapy Research
Lentiviral vectors (LVs) are powerful tools for stable gene delivery, enabling long-term expression in dividing and non-dividing cells. Their large cloning capacity, broad tropism, and ability to integrate into the host genome make them indispensable for gene therapy research, including gene replacement, knockdown, and editing. At Creative Biolabs, we offer comprehensive lentiviral vector development services tailored to your research needs—from design and cloning to high-titer production and quality control. Our platforms are optimized for maximum efficiency, safety, and reproducibility, ensuring your gene therapy projects move forward with confidence.
Custom Design
From promoter selection to codon optimization, we tailor vectors for your gene of interest and target cell type.
High-Titer Production
Third-generation packaging systems and purification methods yield >10⁹ TU/mL with minimal impurities.
Versatile Applications
Overexpression, knockdown (shRNA/miRNA), CRISPR/Cas9, and reporter gene delivery in a single vector.
Lentiviral Vector Development Services
Custom Vector Design
We design lentiviral vectors tailored to your gene of interest, including promoter choice, codon optimization, and regulatory elements.
Constitutive (CMV, EF1α, PGK), tissue-specific (Synapsin, Albumin), or inducible (Tet-On, cumate) promoters to control expression levels and patterns.
cDNA, shRNA/miRNA, gRNA + Cas9, or reporter genes (GFP, Luciferase) with optional tags (Flag, HA, Myc).
Synthetic genes optimized for human/mouse/rat expression to maximize protein yield.
Packaging & Production
High-titer lentiviral particles produced using third-generation packaging systems with multiple purification options.
Third-generation (VSV-G, Rev, Gag/Pol) for improved safety and reduced recombination risk. Optional envelope pseudotyping (e.g., VSV-G, Measles, Baculovirus).
From small-scale (10⁸ TU) to large-scale (10¹¹ TU) batches for in vivo studies.
Ultracentrifugation, TFF, or chromatography to achieve high purity and low endotoxin.
Quality Control
Comprehensive QC to ensure safety, potency, and reproducibility.
Functional titer (TU/mL) by qPCR or FACS, physical titer (VP/mL) by p24 ELISA.
Bacteria, fungi, mycoplasma testing per USP/EP standards.
Sequencing of the expression cassette, restriction mapping.
Custom Modifications
Additional engineering to meet specific research needs.
Tet-On/Off, cumate, or light-inducible promoters for temporal control.
Floxed cassettes for Cre-mediated removal after integration.
Pseudotyping with alternative envelopes (e.g., Rabies glycoprotein for neuronal targeting).
Stable Cell Line Generation
Generate stable cell lines expressing your gene of interest using lentiviral transduction and selection.
Puromycin, Blasticidin, Neomycin, Hygromycin, or fluorescent markers.
Single-cell sorting and expansion to generate isogenic lines.
Clinical Use of Our Advanced Lentiviral Vector
The third generation of self-inactivating lentiviral vectors have recently been used in several clinical trials. CAR T cell therapy engineered with lentiviral vectors has demonstrated remarkable clinical success in patients with B cell malignancies. Lentiviral vector-based gene transfer to HSCs is used to treat several hereditary diseases, including beta-thalassemia, X-linked adrenoleukodystrophy, and metachromatic leukodystrophy.
Currently, Creative Biolabs offers comprehensive lentiviral vectors with multiple cutting-edge modifications used for the following diseases (including but not limited to) based gene therapy:
Technical Capabilities
Advanced engineering for optimal performance in gene therapy research.
Vector Architecture
Our vectors incorporate SIN (self-inactivating) LTRs to reduce promoter interference and enhance safety. Multiple cloning sites allow for easy insertion of your gene.
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SIN LTR DesignEliminates transcriptional read-through and reduces risk of insertional activation.
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cPPT/CTS ElementEnhances nuclear import and transduction efficiency in difficult-to-transduce cells.
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WPRE ElementWoodchuck hepatitis virus posttranscriptional regulatory element boosts transgene expression.
Inducible & Regulated Expression
Precise control over transgene expression for studies requiring temporal regulation.
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Tet-On 3G SystemUltra-low basal expression, high inducibility with doxycycline.
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Cumate-InducibleAlternative system for orthogonal control.
Production & Quality
High-yield, scalable production processes with rigorous quality control.
| Parameter | Specification | Benefit |
|---|---|---|
| Titer (Functional) | >1 x 10⁹ TU/mL | High MOI without volume constraints. |
| Purity | >95% (HPLC) | Minimal cytotoxicity in sensitive cells. |
| Endotoxin | <1 EU/mL | Safe for in vivo research. |
Risk Control & Safety
Engineered with multiple layers of safety to address key concerns in gene therapy research: insertional mutagenesis, RCL, copy number variation, and expression stability.
SIN LTR Design
Self-inactivating LTRs eliminate enhancer/promoter activity of the viral LTR after integration, significantly reducing the risk of insertional activation of nearby genes.
Insulator Elements
Chromatin insulators (e.g., cHS4) can be incorporated to block enhancer-promoter interactions and reduce position effects, ensuring more consistent transgene expression.
Optimization
We control vector copy number by optimizing MOI and provide quantitative PCR services to determine average copy number per cell, enabling reproducible dosing.
RCL Testing
Replication-competent lentivirus (RCL) detection via validated PCR-based assays (VSV-G, gag) and sensitive cell-based amplification assays, ensuring each batch is RCL-negative.
Site Analysis
LAM-PCR or targeted sequencing to map integration sites and assess clonal diversity, helping evaluate genotoxicity risk and vector safety.
Documentation
Detailed batch records, QC certificates, and traceability documentation to support future translational studies.
Representative Performance Metrics
Our lentiviral vectors are manufactured under stringent quality control. The following ranges represent typical performance observed across numerous projects; actual results may vary based on construct, target cells, and experimental conditions.
Transduction Efficiency
Depending on cell type and MOI, we typically achieve 70–95% transduction efficiency in primary cells (e.g., HSCs, T cells) and >90% in common cell lines. Optimized protocols are available for difficult-to-transduce cells.
Long-Term Expression Stability
In long-term culture (≥3 months), we observe stable expression in 85–95% of transduced cells with less than 20% decline in mean fluorescence intensity. Vector copy number typically remains within 1–5 copies per cell under standard conditions.
Batch-to-Batch Consistency
Our validated process ensures functional titer variation <20% between batches. Residual impurities (e.g., plasmid DNA, host cell proteins) are consistently below 50 ng/dose, meeting stringent research requirements.
Safety Testing
All batches are RCL-negative by PCR and cell-based assays. Endotoxin levels are maintained <1 EU/mL, and sterility is confirmed per USP/EP standards, making our vectors suitable for sensitive primary cells and in vivo studies.
In Vivo Performance
In mouse models, systemic administration yields detectable transgene expression in target organs (liver, spleen) for 8+ weeks with minimal variability (<2-fold). Dosing at 1×10⁷–1×10⁸ TU/animal is typically effective.
The ranges above are based on internal studies and extensive project experience. Actual results may differ; we recommend feasibility testing for your specific construct and cell type. Contact our scientists to discuss your project.
Lentiviral Vector Types
Choose the optimal architecture for your research application.
| Vector Type | Features | Applications |
|---|---|---|
|
Constitutive Expression(CMV, EF1α)
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Strong, continuous expression of transgene. Ideal for overexpression studies. | Protein production, functional assays, reporter cell lines. |
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Inducible(Tet-On)
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Doxycycline-controlled expression with minimal leakiness. | Toxic genes, time-course studies, dosage experiments. |
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Excisable(Cre-LoxP)
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Floxed cassette for Cre-mediated removal after integration. | Transient expression studies, footprint-free cell lines. |
|
Reporter(GFP, Luc)
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Fluorescent or luminescent markers for tracking transduction and expression. | In vivo imaging, promoter activity assays, cell tracing. |
|
CRISPR/Cas9
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All-in-one vectors for gRNA and Cas9 (or dual-vector systems). | Gene knockout, knock-in, screening libraries. |
Need a custom combination?
Research Applications
From basic biology to preclinical models, our vectors support diverse gene therapy research.
Gene Overexpression
Stable expression of therapeutic genes, transcription factors, or signaling proteins in cell lines and primary cells.
Gene Knockdown
shRNA or miRNA expression for long-term silencing of target genes in vitro and in vivo.
CRISPR Gene Editing
Delivery of Cas9 and gRNAs for knockout, knock-in, or base editing in difficult-to-transfect cells.
Reprogramming
Polycistronic vectors for iPSC generation or direct lineage conversion.
Disease Modeling
Introduce disease-associated mutations or overexpress pathogenic proteins in relevant cell types.
In Vivo Delivery
High-titer, purified vectors for systemic or localized injection in animal models.
Service Workflow
Streamlined process from consultation to delivery.
Consultation
Discuss your gene, target cells, and experimental goals to select optimal vector design.
Cloning & Validation
Gene synthesis, cloning into lentiviral backbone, and sequence verification.
Packaging
Transient transfection in HEK293T cells with third-generation packaging plasmids.
Purification & QC
Concentration, titer determination, sterility and mycoplasma testing.
Delivery & Support
Vialed virus with detailed documentation and technical support.
What You Receive
All materials needed for your experiments.
Transfer Plasmid
Sequence-verified plasmid DNA, glycerol stock, and full vector map.
High-Titer Virus
Concentrated lentiviral particles in multiple aliquots (PBS/sucrose).
QC Report
Certificate of Analysis including titer, sterility, and mycoplasma results.
Why Choose Lentiviral Vectors?
Lentiviral vectors offer unique advantages for gene therapy research compared to other viral and non-viral methods.
| Method | Integration | Cargo Capacity | Tropism | Best Use Case |
|---|---|---|---|---|
|
Lentivirus
|
Integrating | Up to 8 kb | Broad (VSV-G) or pseudotyped | Stable expression in dividing/non-dividing cells, in vivo delivery |
| AAV | Non-integrating | ~4.7 kb | Serotype-dependent | Transient expression in vivo, gene therapy (clinical) |
| Adenovirus | Non-integrating | Up to 8 kb (first gen) or 30 kb (helper-dependent) | Broad | High transient expression, vaccination, oncolysis |
| Non-viral (plasmid) | Transient | Unlimited | Limited by transfection efficiency | In vitro screening, low-cost |
Frequently Asked Questions
Plan Your Lentiviral Project
To help us design the optimal vector, please consider the following:
- Gene of interest: cDNA, shRNA, gRNA, etc.
- Promoter type: Constitutive, inducible, tissue-specific.
- Target cells: Cell line, primary cells, in vivo.
- Required titer and volume.
- Additional modifications: Tags, reporters, excision.
Get a Custom Quote
Our scientists will work with you to design the perfect vector for your research.
Start Your Project Today
Tell us about your project, and our experts will get back to you with a customized quote and proposal.
