Expression Strategies
VectorsCell linesIntermediate
Transient transfection, stable cell lines, and viral transduction each occupy different positions on the speed–uniformity–cell type flexibility spectrum. Choosing the wrong approach can mean weeks of lost optimization time.
3
Delivery strategies
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Decision attributes
24 h – months
Time-to-expression range
Transgene expression strategy — choosing your delivery and persistence model
| Attribute | Transient transfection | Stable cell line | Viral transduction |
|---|---|---|---|
| Expression persistence | Days (2–7 d peak) | Permanent (clonal selection) | Long-term to permanent (vector-dependent) |
| Time to expression | 24–72 h | Weeks–months (selection + clonal expansion) | Days–weeks |
| Screening throughput | |||
| Cell type flexibility | High (most dividing cell lines) | Moderate (selection marker required) | High (incl. primary, non-dividing) |
| Expression uniformity | Variable (mosaic, transient) | Uniform (clonal) | MOI-dependent |
| Protein yield | |||
| Genomic integration | No | Yes (random or targeted) | Vector-dependent (LV: yes; AAV: typically no) |
| Biosafety overhead | Minimal | Minimal | BSL-2 required for most vectors |
| Best for | Rapid protein production, construct screening, transient knockdown/overexpression | Stable reporter lines, drug screening platforms, long-term phenotypic studies | Primary cells, in vivo studies, non-dividing cell engineering, CAR-T programs |
Rapid construct validation
Transient transfection — results in 24–72 h, no selection required
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Drug screening / HTS platforms
Stable cell line — reproducible, uniform expression across passages
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Primary / non-dividing cells
Viral transduction — the only reliable method for neurons, HSCs, and T cells
Browse viral vectors →
In vivo delivery
Viral transduction — transient or stable options depending on vector choice
Explore in vivo tools →
MOI = multiplicity of infection · HTS = high-throughput screening. Selection marker choice (puromycin, blasticidin, G418) significantly affects stable line generation timeline.