Loss of P19Arf in a Rag1(-/-) B-cell Precursor Population Initiates Acute B-lymphoblastic Leukemia
Overview
Authors
Affiliations
In human B-acute lymphoblastic leukemia (B-ALL), RAG1-induced genomic alterations are important for disease progression. However, given that biallelic loss of the RAG1 locus is observed in a subset of cases, RAG1's role in the development of B-ALL remains unclear. We chose a p19Arf(-/-)Rag1(-/-) mouse model to confirm the previously published results concerning the contribution of CDKN2A (p19ARF /INK4a) and RAG1 copy number alterations in precursor B cells to the initiation and/or progression to B-acute lymphoblastic leukemia (B-ALL). In this murine model, we identified a new, Rag1-independent leukemia-initiating mechanism originating from a Sca1(+)CD19(+) precursor cell population and showed that Notch1 expression accelerates the cells' self-renewal capacity in vitro. In human RAG1-deficient BM, a similar CD34(+)CD19(+) population expressed p19ARF. These findings suggest that combined loss of p19Arf and Rag1 results in B-cell precursor leukemia in mice and may contribute to the progression of precursor B-ALL in humans.
Constitutive Ras signaling and inactivation cooperate during the development of B-ALL in mice.
Sewastianik T, Jiang M, Sukhdeo K, Patel S, Roberts K, Kang Y Blood Adv. 2018; 1(25):2361-2374.
PMID: 29296886 PMC: 5729631. DOI: 10.1182/bloodadvances.2017012211.
Auer F, Ingenhag D, Pinkert S, Kracker S, Hacein-Bey-Abina S, Cavazzana M Oncotarget. 2017; 8(44):75797-75807.
PMID: 29100269 PMC: 5652663. DOI: 10.18632/oncotarget.20563.
Scheijen B, Boer J, Marke R, Tijchon E, van Ingen Schenau D, Waanders E Haematologica. 2016; 102(3):541-551.
PMID: 27979924 PMC: 5394950. DOI: 10.3324/haematol.2016.153023.
Genetically engineered mouse models of human B-cell precursor leukemias.
Hauer J, Borkhardt A, Sanchez-Garcia I, Cobaleda C Cell Cycle. 2014; 13(18):2836-46.
PMID: 25486471 PMC: 4613455. DOI: 10.4161/15384101.2014.949137.
Olsson L, Castor A, Behrendtz M, Biloglav A, Forestier E, Paulsson K Leukemia. 2013; 28(2):302-10.
PMID: 23823658 DOI: 10.1038/leu.2013.206.