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HMGA2 expression defines a subset of AML with immature transcriptional signature and vulnerability to G2/M inhibition.

Moison C, Spinella JF, Chagraoui J, Lavallee VP, Lehnertz B, Thiollier C, Boivin I, Mayotte N, MacRae T, Marinier A, Hébert J, Sauvageau G

Institute for Research in Immunology and Cancer, Université de Montréal, Montreal, Canada.

High Mobility Group AT-hook 2 (HMGA2) is a non-histone chromatin-binding protein which is normally expressed in stem cells of various tissues and aberrantly detected in several tumor types. We recently observed that one fourth of human Acute Myeloid Leukemia (AML) specimens express HMGA2, which associates with a very poor prognosis. We now present results indicating that HMGA2+ AMLs share a distinct transcriptional signature representing an immature phenotype. Using single cell analyses, we showed that HMGA2 is expressed in CD34+ subsets of stem cells and early progenitors, whether normal or derived from AML specimens. Of interest, we found that one of the strongest gene expression signatures associated with HMGA2 in AML is the upregulation of G2/M checkpoint genes. Whole genome CRISPR/Cas9 screening in HMGA2 overexpressing cells further revealed a synthetic lethal interaction with several G2/M checkpoint genes. Accordingly, small molecules that target G2/M proteins were preferentially active in vitro and in vivo on HMGA2+ AML specimens. Together, our findings suggest that HMGA2 is a key functional determinant in AML and is associated with stem cell features, G2/M status and related drug sensitivity.

Blood Adv 2022.

Pubmed ID: 35797243

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