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Assembly Quality vs Pangenome Content QC

Fragmented assemblies can manufacture spurious "accessory" gene families: a gene broken across a contig boundary is predicted as two partial proteins, neither of which clusters with the intact family, so each becomes a fake strain-private family. This report checks whether that confound is present on this run.

Correlations: assembly quality vs pangenome content

Comparison rho (raw) rho (partial, controlling total_length) n strains
accessory_present vs n_contigs 0.3584 0.4244 360
accessory_present vs n50 -0.3283 -0.3957 360
core_missing vs n_contigs 0.0343 0.0168 360
core_missing vs n50 -0.2075 -0.1957 360

WARNING: |rho| exceeds 0.3 for accessory-family content against assembly quality. Between-strain accessory-genome comparisons (accessory island counts, gain/loss calls, Leiden trans-modules) are confounded on this dataset: "strain X has more accessory genes" may mean "strain X has a worse assembly", not a real biological difference. This is a diagnostic only -- no presence call or strain has been altered or excluded.

Contig-terminus enrichment (mechanism check)

Proteins in strain-private (singleton) families sit within 1000 bp of a contig end 25.15% of the time (n=6708), against 5.35% of all 3050945 proteins genome-wide. See assembly_quality_vs_content.tsv for the per-strain breakdown.