COSIGT: population-scalable genotyping of complex loci from low-coverage sequencing data using pangenome graphs.

COSIGT accurately genotypes complex loci from low-coverage sequencing, outperforming existing tools at 1-2X coverage and enabling population-scale analysis.

• Why it matters: Resolving complex genomic regions from shallow sequencing is difficult, especially with low-quality samples like ancient DNA, limiting large-scale genetic studies.
• What they did: The method uses cosine similarity to match read-depth profiles to haplotype paths in pangenome graphs, analyzing thousands of genomes with minimal coverage.
• The result: This approach allows robust genotyping of complex variation across large populations, facilitating insights into genetic diversity from low-coverage data.