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Nachmias, Boaz; Khan, Dilshad H; Voisin, Veronique; Mer, Arvind S; Thomas, Geethu Emily; Segev, Nadav; St-Germain, Jonathan; Hurren, Rose; Gronda, Marcela; Botham, Aaron; Wang, Xiaoming; Maclean, Neil; Seneviratne, Ayesh K; Duong, Nathan; Xu, Changjiang; Arruda, Andrea; Orouji, Elias; Algouneh, Arash; Hakem, Razqallah; Shlush, Liran; Minden, Mark D; Raught, Brian; Bader, Gary D; Schimmer, Aaron D
Leukemia, 05/2022, Volume: 36, Issue: 5Journal Article
AML cells are arranged in a hierarchy with stem/progenitor cells giving rise to more differentiated bulk cells. Despite the importance of stem/progenitors in the pathogenesis of AML, the determinants of the AML stem/progenitor state are not fully understood. Through a comparison of genes that are significant for growth and viability of AML cells by way of a CRISPR screen, with genes that are differentially expressed in leukemia stem cells (LSC), we identified importin 11 (IPO11) as a novel target in AML. Importin 11 (IPO11) is a member of the importin β family of proteins that mediate transport of proteins across the nuclear membrane. In AML, knockdown of IPO11 decreased growth, reduced engraftment potential of LSC, and induced differentiation. Mechanistically, we identified the transcription factors BZW1 and BZW2 as novel cargo of IPO11. We further show that BZW1/2 mediate a transcriptional signature that promotes stemness and survival of LSC. Thus, we demonstrate for the first time how specific cytoplasmic-nuclear regulation supports stem-like transcriptional signature in relapsed AML.
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