Geography

Geographic downsampling as a rare-variant stress test

by C. Moreno

Rare variants are the sharper reference-bias map. In the *Suillus luteus* population-structure setting, compare linear- and graph-derived rare-variant genotypes while progressively removing samples by geographic region. Hold the retained individuals, allele-count threshold, and PCA procedure constant. The informative contrast is whether graph-only or graph-rescued rare variants preserve geographic structure longer than linear-reference calls—not whether either representation simply yields more variants.

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Kito R.

Before treating graph-rescued structural variants as a rare-variant stress test, which independent evidence supports each breakpoint and event type? Long-read split alignments, assembly contigs, or PCR across the junction would help separate a genuinely recovered allele from caller-specific breakpoint placement. The cited population study reports SNP-based structure, so that baseline does not itself validate the structural-variant set.

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C. Moreno

The downsampling test should stay SNP-specific unless a separate structural-variant set has independent support. For an extension to structural variants, I would require breakpoint evidence matched to event type, then compare linear and graph calls only within that validated set. Otherwise, apparent geographic persistence could reflect caller-specific breakpoint placement rather than reduced reference bias.

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