PiggyBac is a Class II DNA transposon that uses a cut-and-paste mechanism. A hyperactive transposase enzyme binds the terminal repeat sequences flanking the transgene in the donor vector. It then catalyses excision and reinsertion into TTAA tetranucleotide sites in the host genome. The transposase can be supplied transiently, so integration is efficient.
Cloning & Expression Systems
Non-Viral Gene Delivery Systems: PiggyBac, Minicircles & Episomal Vectors
Non-viral gene delivery systems for stable integration and transient expression without viral biosafety requirements
A non-viral gene delivery system based on transposon or integrase technology gives you stable transgene integration without viral biosafety requirements, a practical alternative to lentiviral vectors. The PiggyBac transposon system uses a hyperactive transposase to mobilise transposon cargo flanked by inverted terminal repeats, and donor vectors come with constitutive promoters, reporter combinations, and cumate-inducible configurations to match your construct.
The PhiC31 integrase system inserts transgenes at pseudo-attP sites in the mammalian genome and can support lower-copy integration than transposon-based approaches. Insertion site and copy number are not fully predictable, so you characterise them by sequencing in selected clones. Donor vectors pair with an integrase expression plasmid.
Enhanced episomal vectors give you long-term episomal expression without integration, suitable for transient but extended expression windows. Minicircle technology removes bacterial backbone sequences for cleaner in vivo delivery with reduced CpG-driven immune activation, and both work with your transfection protocol.
Matching integration preference to application
1. High-efficiency stable integration, large cargo capacity. PiggyBac transposon accepts inserts up to at least 100 kb and integrates at high efficiency. A hyperactive transposase expression plasmid paired with the donor vector carrying your promoter and selection marker of choice is your route.
2. Lower-copy integration via PhiC31 integrase. PhiC31 integrase can support lower-copy integration at pseudo-attP sites. Insertion site and copy number are not fully predictable, so you characterise them by sequencing in selected clones. A compatible donor vector with a PhiC31 integrase expression plasmid suits you when minimising copy number is a priority.
3. Long-term episomal expression without integration. Enhanced episomal vectors replicate episomally and persist through cell division without genomic insertion, suiting you when you need sustained expression in primary cells but prefer to avoid integration-related positional effects.
4. In vivo or reduced immunogenicity delivery. Minicircle vectors remove bacterial backbone, reducing the CpG load that triggers innate immune responses, a good fit when you are delivering to primary cells or in vivo by non-viral means.
5. Inducible control of any non-viral system. Cumate-inducible configurations using the CuO-CymR promoter system are available across PiggyBac and episomal formats, giving you dose-dependent transgene control you can dial in.
Parent category: Cloning & Expression Systems
Applications
Stable cell line generation
PiggyBac and PhiC31 integrase systems build stable integrant lines without the viral biosafety requirements of lentiviral packaging.
Large cargo delivery
PiggyBac transposons accommodate inserts up to 100 kb, enough for full genomic loci or several independently regulated transgenes in one integration event.
Long-term episomal expression in primary cells
Enhanced episomal vectors replicate without genomic integration, so you keep steady expression without altering your host genome.
Reduced immunogenicity in vivo
Minicircle vectors remove bacterial backbone CpG motifs, giving a weaker immune response than conventional plasmids for in vivo delivery.
Dose-dependent inducible expression
Cumate-inducible configurations use the CuO operator and CymR repressor across PiggyBac and episomal formats, part of inducible gene expression control.
Defined-copy-number integration for dosage studies
PhiC31 integrase gives lower-copy integration than transposon systems, useful when low-copy expression matters more than efficiency to you.
Frequently asked questions
Both approaches create stably expressing lines, but they differ in practicality. Non-viral systems need only standard transfection equipment and avoid viral biosafety approvals. Lentiviral systems achieve higher transduction efficiency in hard-to-transfect and non-dividing cells. For standard dividing cell lines in a conventional tissue culture lab, PiggyBac or PhiC31 are often the simpler starting point.
A minicircle is a circular DNA molecule produced by recombination from a parental plasmid. This removes the bacterial origin of replication and antibiotic resistance gene. The resulting small circular DNA molecule contains only the expression cassette. Removing bacterial backbone sequences reduces CpG-mediated innate immune activation. It can also extend transgene expression duration in primary cells and in vivo models.
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