The genetic architecture of human DNA methylome variation

Using 460 Human Pangenome Reference Consortium Release 2 haplotypes, the study maps 47,039 CGI alleles and shows methylation variability is buffered across over 90% of the genome.

• Why it matters: Reference-only methylome analyses limit comparable measurements across diverse genomes, leaving the genetic architecture of methylome variation unclear.
• What they did: The authors built two pangenome-based frameworks—homologous-region comparisons preserving haplotype structure and sequence-resolved CGI alleles—then performed allele-aware mQTL mapping and local genealogy reconstruction.
• The result: They attribute 62% of CGI alleles to structural variants and 31% to small variants, find methylation differences align with CGI gain/loss turnover, and link mQTLs to transcriptomic traits and complex traits, supporting 8% of population differentially methylated regions and colocalization with more than half of GWAS loci.

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