What is Lenti-X?
The Lenti-X Concentrator is a complete reagent for the concentration of infectious lentiviral vector particles. This reagent provides a scalable alternative to ultracentrifugation for viral particle concentration. Vector supernatants can be concentrated 10–100 fold, depending upon the volumes used.
What is lentivirus packaging?
Lentiviral particles are packaged in producer cell lines such as HEK293T cells. Upon co-transfection of the plasmids, all required sequences are available to produce and package a viral particle containing the transgene of interest.
Which generation is lentivirus?
2nd generation
Briefly, 2nd generation lentiviral systems use more HIV proteins (on fewer plasmids) in order to produce functional lentiviral particles than 3rd generation systems. 2nd generation packaging systems: express the HIV gag, pol, rev, and tat genes all from a single packaging plasmid such as psPAX2.
What is lentiviral expression vector?
A lentiviral expression vector contains the genetic elements required for packaging, transduction, stable integration of the viral expression construct into genomic DNA, and expression of the shRNA, sgRNA, cDNA, or reporter.
How do lentiviral particles concentrate?
Here, the data demonstrated that the lentivirus can be concentrated with a sucrose gradient centrifugation at 10,000 g RCF, a centrifuge force easily achieved using a regular tabletop centrifuge. Furthermore, this method can be easily modified for the large-scale preparation of lentiviral stock.
How does lentiviral delivery work?
Liu: A lentiviral vector only contains long terminal repeats (LTRs), a packaging signal, and the gene of interest so the pseudoparticles can only infect the target cells. They are replication deficient, and no virus will be produced after infecting target cells.
What are the two main functions of lentivirus recombination?
The Lentivirus – The Recombinant Lentivirus System
| Molecular | Function |
|---|---|
| 1. Cis-acting | |
| LTRs | Contain sequences required for viral gene expression, reverse transcription, and integration |
| ψ | Required for packaging of the genomic transfer RNA |
| RRE | Rev response element. Required for processing and transport of viral RNAs |
How is lentivirus transmitted?
Transmitted from person to person through direct exposure to infected body fluids (blood, semen) sexual contact, sharing unclean needles etc.; transplacental transfer can occur.
Is lentivirus a plasmid?
When lentivirus is used for research, it is the lentiviral genome that encodes genetic material that the researcher wants delivered to specific target cells. This genome is encoded by plasmids called “transfer plasmids,” which can be modified to encode a wide range of gene products.
How do you make a lentiviral vector?
Lentiviral vectors can be assembled through transient co-transfection of the lentiviral vector backbone plasmid with helper plasmids expressing viral packaging functions or by stably transfected packaging cell lines. The first production method is currently a preferred choice because of its greater flexibility.
How do you package lentivirus?
Procedure
- Seed 293T packaging cells at 3.8×106 cells per plate in DMEM complete in 10 cm tissue culture plates.
- Incubate the cells at 37 ℃, 5% CO2 for ~20 hours.
- Gently aspirate media, add 10 mL fresh DMEM complete containing 25 μM cloroquine diphosphate and incubate ~5 hours.
What packaging systems does Lenti-X offer for lentivirus?
In addition to Lenti-X Packaging Single Shots, we also offer packaging systems for generating VSV-G pseudotyped lentivirus and ecotropic pseudotyped lentivirus in a traditional format. These kits include packaging mix and Xfect Transfection Reagent as separate liquid components.
Do I need any additional transfection reagent for Lenti-X?
No additional transfection reagent is needed. Lenti-X packaging single shots consist of optimized ratios of Xfect Transfection Reagent and Lenti-X packaging plasmids-lyophilized and pre-aliquoted in single tubes or 96-well plates.
Can I use a lentiviral vector as a transfection vector?
You can use a lentiviral vector to perform transfections as you would with a regular plasmid. However, this negates one of the advantages of lentiviral transduction: reproducible integration of individual copies of your transgene.