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Learn MoreMYSM1 is a transcriptional regulator essential for HSC function and hematopoiesis. We established that p53 activation is a common mechanism mediating HSC dysfunction, MPP depletion, and lymphopenia in Mysm1-deficiency, however, the specific p53-induced effectors that trigger dysfunction in Mysm1-deficient HSPCs remain unknown. Here, we performed RNA-Seq of Lin-cKit+Sca1+CD150+ and CD150- HSPCs from Mysm1-/-Puma-/-, Mysm1-/-Puma+/-, Puma-/-, and wild-type mice; (Mysm1-/-Puma+/- phenocopies Mysm1-/-). We showed that Bbc3/PUMA is the primary non-redundant mediator of MPP depletion in Mysm1-deficiency and contributes to HSC dysfunction, whereas depletion of lymphoid-lineage cells involves PUMA-independent p53 activities. We also identified a broad downregulation of genes encoding protein components of the ribosome (RP-genes) and other regulators of translation in Mysm1-deficiency, and the downregulation persisted in Mysm1-/-Puma-/-. SOURCE: David Langlais (david.langlais@mcgill.ca) - Inflammation Genomics Lab McGill University
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