Connect the molecule to a place and a timescale
The toolkit includes bounded models for absorption, barrier passage and time-dependent compartment exposure. A program might ask whether access, retention or conversion controls the next decision. Each question needs the appropriate operation and inputs.
PK-Sim and MoBi already support mechanistic exposure modeling, data comparison and reusable model components. BioTwin’s bounded methods are aimed at exposure questions within a particular intervention investigation.
| Question | Familiar approach | BioTwin focus | Practical consequence |
|---|---|---|---|
| Modeling workflow | PK-Sim supports PBPK model creation, comparison with observations and refinement. | Investigate a defined absorption, barrier or compartment/time-course hypothesis with the available operation. | Select a model that answers the immediate program question. |
| Composition | MoBi provides reusable spatial, molecular, reaction and transport building blocks. | Consider how exposure constrains another BioTwin mechanism or candidate-design question. | Carry compatible concentration and timing assumptions into the follow-up analysis. |
| Evidence | Model credibility depends on appropriate inputs and agreement with relevant observations. | BioTwin exposure predictions likewise need molecule- and setting-specific calibration. | Use the result to choose a measurement; do not mistake it for measured bioavailability. |
The BioTwin scope here is an early computational exposure investigation. Qualification depends on the model, data and intended decision.
Make the output a decision about evidence
A sensitivity analysis can identify a permeability, clearance or distribution measurement that would change the conclusion. Computational exposure is a hypothesis until calibrated against relevant data. Measured bioavailability and clinical dose selection require additional evidence.
Follow exposure into its biological consequence
Liver-directed mechanisms, local effect and subcellular partitioning each ask what a concentration estimate means in a different setting. Joining them requires compatible compartments, timing and biological assumptions.
- Liver-directed mechanisms · Separate uptake from hepatic activation. Liver-directed mechanisms
- Local effect · Translate local and systemic exposure into a target-response question. Local effect
- Subcellular distribution · Ask where a small molecule accumulates inside the cell. Subcellular distribution