Mcm2 hypomorph leads to acute leukemia or hematopoietic stem cell failure, dependent on genetic context

Matsukawa, Toshihiro, Yin, Mianmian, Baslan, Timour, Chung, Yang Jo, Cao, Dengchao, Bertoli, Ryan, Zhu, Yuelin J, Walker, Robert L, Freeland, Amy, Knudsen, Erik, Lowe, Scott W, Meltzer, Paul S, Aplan, Peter D (September 2022) Mcm2 hypomorph leads to acute leukemia or hematopoietic stem cell failure, dependent on genetic context. The FASEB Journal, 36 (9). e22430. ISSN 0892-6638

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URL: https://www.ncbi.nlm.nih.gov/pubmed/35920299
DOI: 10.1096/fj.202200061RR

Abstract

Minichromosome maintenance proteins (Mcm2-7) form a hexameric complex that unwinds DNA ahead of a replicative fork. The deficiency of Mcm proteins leads to replicative stress and consequent genomic instability. Mice with a germline insertion of a Cre cassette into the 3'UTR of the Mcm2 gene (designated Mcm2Cre ) have decreased Mcm2 expression and invariably develop precursor T-cell lymphoblastic leukemia/lymphoma (pre-T LBL), due to 100-1000 kb deletions involving important tumor suppressor genes. To determine whether mice that were protected from pre-T LBL would develop non-T-cell malignancies, we used two approaches. Mice engrafted with Mcm2Cre/Cre Lin- Sca-1+ Kit+ hematopoietic stem/progenitor cells did not develop hematologic malignancy; however, these mice died of hematopoietic stem cell failure by 6 months of age. Placing the Mcm2Cre allele onto an athymic nu/nu background completely prevented pre-T LBL and extended survival of these mice three-fold (median 296.5 vs. 80.5 days). Ultimately, most Mcm2Cre/Cre ;nu/nu mice developed B-cell precursor acute lymphoblastic leukemia (BCP-ALL). We identified recurrent deletions of 100-1000 kb that involved genes known or suspected to be involved in BCP-ALL, including Pax5, Nf1, Ikzf3, and Bcor. Moreover, whole-exome sequencing identified recurrent mutations of genes known to be involved in BCP-ALL progression, such as Jak1/Jak3, Ptpn11, and Kras. These findings demonstrate that an Mcm2Cre/Cre hypomorph can induce hematopoietic dysfunction via hematopoietic stem cell failure as well as a "deletor" phenotype affecting known or suspected tumor suppressor genes.

Item Type: Paper
Subjects: diseases & disorders > cancer > cancer types > acute myeloid leukemia
organs, tissues, organelles, cell types and functions > cell types and functions > cell types > hematopoietic cell
organs, tissues, organelles, cell types and functions > cell types and functions > cell types > hematopoietic cell
organs, tissues, organelles, cell types and functions > cell types and functions > cell types > hematopoietic cell
CSHL Authors:
Communities: CSHL labs > Krasnitz lab
CSHL labs > Lowe lab
SWORD Depositor: CSHL Elements
Depositing User: CSHL Elements
Date: September 2022
Date Deposited: 08 Sep 2022 22:21
Last Modified: 08 Sep 2022 22:21
PMCID: PMC9377154
URI: https://repository.cshl.edu/id/eprint/40713

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