transfection-infection assay

Stages

1. 1.
   gp64 targeting design and assay setup(library_design)

   This stage establishes the set of gp64 targeting conditions to evaluate how target location and multiplicity affect baculovirus reduction and protein production.

   Selection: Target the AcMNPV gp64 gene at six different locations using single and multiple targeting sites.

2. 2.
   cell-based functional assessment(functional_characterization)

   This stage tests whether gp64 targeting achieves the manufacturing-relevant objective of lowering baculovirus co-production without compromising recombinant protein output.

   Selection: Assess reduction in baculovirus vector levels together with maintenance or enhancement of foreign protein production.

3. 3.
   viral genome isolation and sequencing readout(sequencing_readout)

   This stage confirms that targeted indels occurred in gp64 and addresses the fact that edited genomes may be minority variants.

   Selection: Isolate viral genomes from supernatant and cell pellet fractions and detect gp64 indels by sequencing.

4. 4.
   propagation-based variant conservation assessment(confirmatory_validation)

   This stage tests whether detected variants persist during propagation, which the authors interpret as evidence that they are not detrimental to viral fitness.

   Selection: Evaluate whether variants found in virus stock are conserved upon propagation in cell culture.

Steps

1. 1.
   Target AcMNPV gp64 at six locations in a transfection-infection assayassay framework

   Set up single and multiple gp64 targeting conditions for comparative evaluation.

   Targeting conditions must be established before phenotypic and sequencing outcomes can be measured.

2. 2.
   Measure baculovirus vector levels and foreign protein production

   Determine whether gp64 targeting reduces baculovirus vectors while preserving or improving recombinant protein output.

   Functional production outcomes are assessed after targeting to identify whether the engineering objective is met before molecular confirmation.

3. 3.
   Isolate viral genomes from supernatant and cell pellet fractions

   Prepare viral genetic material for sequencing-based detection of gp64 edits.

   Genome isolation is required before the sequencing pipeline can assess whether targeted indels were generated.

4. 4.
   Detect gp64 indel mutations with the sequencing pipelinevariant detection method

   Confirm targeted editing in gp64, including minority edited variants.

   This analysis follows genome isolation and is needed because not all genomes are effectively disrupted and edited variants may not be dominant.

5. 5.
   Assess conservation of detected variants after propagation in cell culture

   Evaluate whether detected variants persist during propagation as an indicator of compatibility with viral fitness.

   Variant conservation can only be tested after variants have first been detected in virus stock.