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- Title
Single-cell DNA sequencing identifies risk-associated clonal complexity and evolutionary trajectories in childhood medulloblastoma development.
- Authors
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; Clifford, Steven C.
- 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.
- Subjects
CHILD development; DNA sequencing; CHROMOSOME abnormalities; NUCLEOTIDE sequencing; MEDULLOBLASTOMA; CHILDHOOD cancer
- Publication
Acta Neuropathologica, 2022, Vol 144, Issue 3, p565
- ISSN
0001-6322
- Publication type
Article
- DOI
10.1007/s00401-022-02464-x