Pangenome Openness Confounder Audit

Why It Matters

Pangenome openness is a useful organizing concept, but it can be confounded by taxonomy, sampling depth, genome quality, and annotation completeness. A clear audit makes the claim stronger where it survives and narrower where it does not.

Review Brief

What changed: openness now appears in more claims, topics, and derived products, making a confounder audit more urgent.

Why review matters: reviewers should define the minimum controls required before openness can be reused as an explanatory variable.

Evidence to inspect:

• Pangenome openness shapes functional opportunity for the core claim.
• Pangenome Openness Metrics for reusable inputs.
• pangenome_openness, openness_functional_composition, and conservation_vs_fitness for source evidence.

Questions for reviewers:

• Which confounder is most likely to change current conclusions: genome count, taxonomy, quality, or annotation density?
• Should the audit produce revised caveat labels or revised metrics?
• What effect size is large enough to preserve after controls?
• Which downstream pages should be updated if openness weakens after adjustment?

Evidence Base

The relevant projects already connect openness, conservation, fitness, core-gene tradeoffs, and functional composition. The opportunity is to standardize the caveat analysis so future Atlas pages reuse the metric responsibly.

Work Package

Model openness-function associations with explicit controls for clade, genome count, assembly quality, annotation density, and collection source. Compare raw and adjusted effects and record which conclusions are robust.

Decision Use

The result should update Pangenome Openness Metrics, the pangenome topic page, and any future opportunity that treats openness as a predictor.