Sequentially inducible mouse models reveal that Npm1 mutation causes malignant transformation of Dnmt3a-mutant clonal hematopoiesis.
Document Type
Article
Publication Date
7-2019
Keywords
JMG
JAX Source
Leukemia 2019 Jul; 33(7):1635-1649
Volume
33
Issue
7
First Page
1635
Last Page
1649
ISSN
1476-5551
PMID
30692594
DOI
https://doi.org/10.1038/s41375-018-0368-6
Grant
CA184851,DK112947,DK118072,CA034196
Abstract
Clonal hematopoiesis (CH) is a common aging-associated condition with increased risk of hematologic malignancy. Knowledge of the mechanisms driving evolution from CH to overt malignancy has been hampered by a lack of in vivo models that orthogonally activate mutant alleles. Here, we develop independently regulatable mutations in DNA methyltransferase 3A (Dnmt3a) and nucleophosmin 1 (Npm1), observed in human CH and AML, respectively. We find Dnmt3a mutation expands hematopoietic stem and multipotent progenitor cells (HSC/MPPs), modeling CH. Induction of mutant Npm1 after development of Dnmt3a-mutant CH causes progression to myeloproliferative disorder (MPD), and more aggressive MPD is observed with longer latency between mutations. MPDs uniformly progress to acute myeloid leukemia (AML) following transplant, accompanied by a decrease in HSC/MPPs and an increase in myeloid-restricted progenitors, the latter of which propagate AML in tertiary recipient mice. At a molecular level, progression of CH to MPD is accompanied by selection for mutations activating Ras/Raf/MAPK signaling. Progression to AML is characterized by additional oncogenic signaling mutations (Ptpn11, Pik3r1, Flt3) and/or mutations in epigenetic regulators (Hdac1, Idh1, Arid1a). Together, our study demonstrates that Npm1 mutation drives evolution of Dnmt3a-mutant CH to AML and rate of disease progression is accelerated with longer latency of CH.
Recommended Citation
Loberg M,
Bell R,
Goodwin L,
Eudy E,
Miles L,
SanMiguel J,
Young K,
Bergstrom DE,
Levine R,
Schneider R,
Trowbridge JJ.
Sequentially inducible mouse models reveal that Npm1 mutation causes malignant transformation of Dnmt3a-mutant clonal hematopoiesis. Leukemia 2019 Jul; 33(7):1635-1649
Comments
We thank Nicole Dean, Tara Murphy, Eraj Khokhar, Kai Cheng, and Judy Morgan for technical help, experimental and laboratory support, Kevin Mills and members of the Trowbridge laboratory for helpful discussion and critical comments, and Will Schott for cell sorting.