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Retinoid X receptor promotes hematopoietic stem cell fitness and quiescence by repressing MYC pathway activation [RXR_CnR]

ABSTRACT: Hematopoietic stem cells (HSCs) maintain homeostasis and fitness by balancing self-renewal and differentiation. Alterations to the symmetry of HSC divisions reduce quiescence and induce myeloid/megakaryocyte-biased hematopoiesis. Here, we show that HSC self-renewal, fitness, and function are preserved by the master transcription factor retinoid X receptor (RXR). We demonstrate that dual lack of hematopoietic RXRα and RXRβ induces HSC asymmetric cell division resulting in HSC exhaustion and age-associated myeloproliferative disease. Characterization of transcriptomic and epigenetic changes in RXR-deficient HSCs demonstrated chromatin opening, acquisition of a premature aging-like HSC signature, MYC pathway upregulation, and RNA intron retention. Myc haploinsufficiency completely prevents the loss of RXR-deficient HSC activity. Our study unveils the critical relevance of RXR for HSC homeostasis and fitness.

ORGANISM(S): Mus musculus

PROVIDER: GSE199936 | GEO | 2022/11/16

REPOSITORIES: GEO

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Retinoid X receptor promotes hematopoietic stem cell fitness and quiescence by repressing MYC pathway activation [RXR_ATACSeq]

Project description:Hematopoietic stem cells (HSCs) maintain homeostasis and fitness by balancing self-renewal and differentiation. Alterations to the symmetry of HSC divisions reduce quiescence and induce myeloid/megakaryocyte-biased hematopoiesis. Here, we show that HSC self-renewal, fitness, and function are preserved by the master transcription factor retinoid X receptor (RXR). We demonstrate that dual lack of hematopoietic RXRα and RXRβ induces HSC asymmetric cell division resulting in HSC exhaustion and age-associated myeloproliferative disease. Characterization of transcriptomic and epigenetic changes in RXR-deficient HSCs demonstrated chromatin opening, acquisition of a premature aging-like HSC signature, MYC pathway upregulation, and RNA intron retention. Myc haploinsufficiency completely prevents the loss of RXR-deficient HSC activity. Our study unveils the critical relevance of RXR for HSC homeostasis and fitness.

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