Clonal origin and development of high hyperdiploidy in childhood acute lymphoblastic leukaemia.

Woodward EL, Yang M, Moura-Castro LH, van den Bos H, Gunnarsson R, Olsson-Arvidsson L, Spierings DCJ, Castor A, Duployez N, Zaliova M, Zuna J, Johansson B, Foijer F, Paulsson K

Nat Commun 14 (1) 1658 [2023-03-25; online 2023-03-25]

High hyperdiploid acute lymphoblastic leukemia (HeH ALL), one of the most common childhood malignancies, is driven by nonrandom aneuploidy (abnormal chromosome numbers) mainly comprising chromosomal gains. In this study, we investigate how aneuploidy in HeH ALL arises. Single cell whole genome sequencing of 2847 cells from nine primary cases and one normal bone marrow reveals that HeH ALL generally display low chromosomal heterogeneity, indicating that they are not characterized by chromosomal instability and showing that aneuploidy-driven malignancies are not necessarily chromosomally heterogeneous. Furthermore, most chromosomal gains are present in all leukemic cells, suggesting that they arose early during leukemogenesis. Copy number data from 577 primary cases reveals selective pressures that were used for in silico modeling of aneuploidy development. This shows that the aneuploidy in HeH ALL likely arises by an initial tripolar mitosis in a diploid cell followed by clonal evolution, in line with a punctuated evolution model.

Clinical Genomics Lund [Service]

PubMed 36966135

DOI 10.1038/s41467-023-37356-5

Crossref 10.1038/s41467-023-37356-5

pmc: PMC10039905
pii: 10.1038/s41467-023-37356-5