AI Insight
Researchers created a near-complete telomere-to-telomere genome assembly of melanoma tissue and compared it with matched normal tissue using deep long-read sequencing. They discovered that 16% of cancer-causing mutations occur in genomic regions not present in the standard human reference genome, with satellite repeats absorbing UV damage and kinetochore regions showing both genetic and epigenetic alterations. The study reveals that epigenetic mutations, rather than genetic changes, predominantly drive regulatory alterations in this cancer.
Why it matters
This research demonstrates that current cancer genomic studies may miss a significant fraction of mutations by relying on incomplete reference genomes. The findings could improve cancer diagnosis and treatment strategies by providing a more complete picture of how melanoma develops, particularly regarding UV-induced damage and gene regulation changes.
Understand the Science
A near-telomere-to-telomere diploid assembly is paired with deep long-read sequencing of a matched melanoma, revealing that 16% of somatic variants lie in sequences absent from GRCh38. Satellite repeats absorb UV damage, kinetochore binding domains accrue both genetic and epigenetic variation, and somatic epimutations dominate the altered regulatory landscape.
Source: A telomere-to-telomere map of somatic mutation burden and functional impact in a cancer