1. Single-cell DNA sequencing identifies risk-associated clonal complexity and evolutionary trajectories in childhood medulloblastoma development.
- Author
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Danilenko, Marina, Zaka, Masood, Keeling, Claire, Crosier, Stephen, Lyman, Stephanie, Finetti, Martina, Williamson, Daniel, Hussain, Rafiqul, Coxhead, Jonathan, Zhou, Peixun, Hill, Rebecca M., Hicks, Debbie, Rand, Vikki, Joshi, Abhijit, Schwalbe, Edward C., Bailey, Simon, and Clifford, Steven C.
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CHILD development , *DNA sequencing , *CHROMOSOME abnormalities , *NUCLEOTIDE sequencing , *MEDULLOBLASTOMA , *CHILDHOOD cancer - Abstract
We reconstructed the natural history and temporal evolution of the most common childhood brain malignancy, medulloblastoma, by single-cell whole-genome sequencing (sc-WGS) of tumours representing its major molecular sub-classes and clinical risk groups. Favourable-risk disease sub-types assessed (MBWNT and infant desmoplastic/nodular MBSHH) typically comprised a single clone with no evidence of further evolution. In contrast, highest risk sub-classes (MYC-amplified MBGroup3 and TP53-mutated MBSHH) were most clonally diverse and displayed gradual evolutionary trajectories. Clinically adopted biomarkers (e.g. chromosome 6/17 aberrations; CTNNB1/TP53 mutations) were typically early-clonal/initiating events, exploitable as targets for early-disease detection; in analyses of spatially distinct tumour regions, a single biopsy was sufficient to assess their status. Importantly, sc-WGS revealed novel events which arise later and/or sub-clonally and more commonly display spatial diversity; their clinical significance and role in disease evolution post-diagnosis now require establishment. These findings reveal diverse modes of tumour initiation and evolution in the major medulloblastoma sub-classes, with pathogenic relevance and clinical potential. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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