Abstract
SETBP1 is a potential epigenetic regulator whose hotspot mutations preventing proteasomal degradation are recurrently detected in myeloid malignancies with poor prognosis. It is believed that the mutant SETBP1 exerts amplified effects of wild-type SETBP1 rather than neomorphic functions. This indicates that dysregulated quantitative control of SETBP1 would result in the transformation of hematopoietic cells. However, little is known about the roles of endogenous SETBP1 in malignant and normal hematopoiesis. Thus, we integrated the analyses of primary AML and healthy samples, cancer cell lines, and a newly generated murine model, Vav1-iCre;Setbp1fl/fl. Despite the expression in long-term hematopoietic stem cells, SETBP1 depletion in normal hematopoiesis minimally alters self-renewal, differentiation, or reconstitution in vivo. Indeed, its loss does not profoundly alter transcription or chromatin accessibilities. Furthermore, although AML with high SETBP1 mRNA is associated with genetic and clinical characteristics for dismal outcomes, SETBP1 is dispensable for the development or maintenance of AML. Contrary to the evidence that SETBP1 mutations are restricted to myeloid malignancies, dependency on SETBP1 mRNA expression is not observed in AML. These unexpected results shed light on the unrecognized idea that a physiologically nonessential gene can act as an oncogene when the machinery of protein degradation is damaged.
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Data availability
RNA-seq data generated by Beat AML (dbGaP accession phs001657.v1.p1) were downloaded from the National Cancer Institute’s Genomic Data Commons. The RNA-seq data generated in this study were deposited in Sequence Read Archive under BioProject ID: PRJNA898600 and PRJNA974068, and the ATAC-seq data under BioProject ID: PRJNA898579 and PRJNA974069.
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Funding
DI is supported by American Society of Hematology, Japanese Society of Hematology, The Naito Foundation, The Uehara Memorial Foundation, KAKETSUKEN, The Princess Takamatsu Cancer Research Fund, SGH Foundation, The Mother and Child Health Foundation, Kato Memorial Bioscience Foundation, JSPS KAKENHI (23H00430, JP20H00537 and JP20H03717) and the Japan Agency for Medical Research and Development (AMED) (21ck0106697h0001). AT is supported by JSPS KAKENHI (JP21J15620). Other financial support includes Grant-in-Aid for Scientific Research (MEXT/JSPS KAKENHI JP19H05656 (SO), JP26221308 (SO), JP21K08394 (AK), JP18K16084 (AK)), AMED (JP21cm0106501h0006 (SO), JP22ama221508h0001 (AK)).
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AT, KN, and DI designed the study; KA, JT, HT, MNakayama, MM, HK, and SO established Setbp1 conditional knock-out mice. MNomura and DI performed computational analyses of clinical information; WZ, MNomura, and DI performed computational analyses of RNA-seq and ATAC-seq data; AT, YK, WZ, HY, MF, WS, HI, YH, HK, TK, AT-K, and DI performed animal experiments; AT, MNomura, MNakayama, MM, WZ, and DI wrote the manuscript with approval from all co-authors.
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Tanaka, A., Nishimura, K., Saika, W. et al. SETBP1 is dispensable for normal and malignant hematopoiesis. Leukemia 37, 1802–1811 (2023). https://doi.org/10.1038/s41375-023-01970-5
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DOI: https://doi.org/10.1038/s41375-023-01970-5