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Somatic structural variation signatures in pediatric brain tumors
Yang Yang1, Lixing Yang1,2,3
1Ben May Department for Cancer Research, University of Chicago, Chicago, IL, USA.
Medrxiv : the Preprint Server for Health Sciences
|June 9, 2023
Summary
Pediatric brain tumors exhibit diverse somatic structural variations (SVs), large DNA alterations, with unique mutational signatures across tumor types. These distinct genomic patterns differ from adult cancers and impact key cancer genes, driving disease progression.
Area of Science:
- Genomics
- Pediatric Oncology
- Cancer Biology
Background:
- Brain cancer is the leading cause of cancer-related death in children.
- Somatic structural variations (SVs) in pediatric brain tumors are poorly understood.
- Understanding SVs is crucial for pediatric brain tumor research.
Approach:
- Analyzed 13,199 high-confidence somatic SVs in 744 whole-genome-sequenced pediatric brain tumors from the Pediatric Brain Tumor Atlas.
- Decomposed mutational signatures of clustered complex SVs, non-clustered complex SVs, and simple SVs.
- Inferred SV formation mechanisms and compared pediatric tumor signatures with adult cancers.
Key Points:
- Somatic SV occurrences show significant diversity across pediatric brain tumor types.
- Distinct tumor types possess unique sets of SV signatures, indicating type-specific molecular mechanisms driving genome instability.
- Pediatric brain tumor SV signatures differ substantially from those observed in adult cancers.
Conclusions:
- Unique SV signatures in pediatric brain tumors suggest distinct molecular drivers of genome instability.
- The convergence of multiple SV signatures on major cancer driver genes highlights their functional importance in disease progression.
- This study provides critical insights into the role of SVs in pediatric brain tumor development and evolution.
