Faecalibacterium Engineering Questions (comp-008)¶

COMP-008 does not rank payloads or establish Faecalibacterium as a tractable chassis. Its hard-coded scores, ranges, category thresholds, roadmap, and host-safety rationales were uncalibrated. The COMP-008 tombstone is non-runnable; Git retains the retired artifact.

The artifact did correctly separate CR1 P17927 from DAF/CD55 P08174. It did not validate a specific CR1 fragment, lactoferrin construct, uricase topology, transformation method, secretion route, or native-pathway intervention.

Research conjecture — native-pathway intervention as one configuration question

Grounded premises: Faecalibacterium is a butyrate-producing gut commensal candidate, while the cited MAM studies used engineered Lactococcus lactis as a delivery workaround rather than demonstrating the proposed Faecalibacterium engineering route (In Vitro / Animal Model precedent; DOI 10.1136/gutjnl-2014-307649 and DOI 10.3389/fmicb.2017.00114). The exact transformation, expression, product-flux, colonization, and exposure performance of the proposed strain configuration is unmeasured.

Novel leap: If a reproducible genetic entry point exists, a bounded native-pathway intervention might change local butyrate exposure without requiring a secreted heterologous protein. No direct evidence establishes that engineered configuration, and this does not make it preferable to other payload or chassis questions.

Why it matters: A native-pathway result would test one mechanistically distinct use of the chassis without declaring it the project or assigning it priority.

Discriminating observation: In one exact strain, demonstrate stable transformation and reporter expression, then compare a prespecified native-pathway intervention with an isogenic control for product flux, growth, stability, colonization-relevant fitness, and epithelial exposure. This test is independent of the separate uricase, lactoferrin, and CR1 configuration questions.

Uricase, lactoferrin, and CR1 remain separate configuration-level questions. Oxygen access, native folding, secretion, retained function, colonization density, and delivered exposure must be measured for the exact construct and compartment; COMP-008 supplies no ordering among them.