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Chromatin Accessibility Maps Provide Evidence of Multilineage Gene Priming in Hematopoietic Stem Cells

ABSTRACT: Hematopoietic stem cells (HSCs) have the capacity to differentiate into vastly different types of mature blood cells. The epigenetic mechanisms regulating the multilineage ability, or multipotency of HSCs are not well understood. To test the hypothesis that cis regulatory elements that control fate decisions for all lineages are primed in HSCs, we used ATAC-seq to compare chromatin accessibility of HSCs with five unipotent cell types. We observed the highest similarity in accessibility profiles between Megakaryocyte Progenitors and HSCs, whereas B cells had the greatest number of regions with de novo gain in accessibility during differentiation. Despite these differences, we identified cis regulatory elements from all lineages that displayed epigenetic priming in HSCs. These findings provide new insights into the regulation of stem cell multipotency, as well as a resource to identify functional drivers of lineage fate.

ORGANISM(S): Mus musculus

PROVIDER: GSE162949 | GEO | 2021/01/06

REPOSITORIES: GEO

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Project description:Glandular epithelia including the mammary gland (MG) and the prostate are composed of basal cells (BC) and luminal cells (LC). Lineage tracing demonstrates that many glandular epithelia initially develop from multipotent basal stem cells (BaSCs) that are replaced in adult life by distinct pool of unipotent stem cells (SCs). However, adult unipotent BaSC can reactivate multipotency and give rise to LCs upon transplantation or oncogene expression, demonstrating the important plasticity of BaSCs in regenerative and pathological conditions, and suggesting that an active mechanism restricts multipotency in BaSCs during physiological conditions. The nature of this mechanism is currently unknown. Here, we assess whether basal and luminal cell-cell communication restricts multipotency in glandular epithelia. To this end, we performed lineage tracing of BCs together with the ablation of LCs in different adult glandular epithelia including MG, prostate, sweat glands and salivary glands and assessed the fate of BaSCs overtime. Interestingly, ablation of LCs reactivated multipotency in unipotent adult BaSCs from multiple epithelia. To understand the molecular mechanisms that controls multipotency in adult BaSCs, we performed population bulk-RNA-seq and single cell RNA-seq of FACS isolated adult mammary epithelial cells after LC ablation. Upon LC ablation, adult BCs activate a hybrid basal and luminal differentiation program before giving rise to LC, reminiscent of the genetic program that regulate multipotency during embryonic development. Different signaling pathways including Notch, Wnt and Egfr were activated in BaSC and their progeny following LC ablation and blocking these pathways inhibited adult BC multipotency. Altogether, our study demonstrates that heterotypic LC and BC communication is essential to maintain lineage fidelity in glandular epithelial SC during homeostasis and uncovers the lineage trajectory and signaling pathways that promote multipotency during tissue repair.

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Chromatin Accessibility Maps Provide Evidence of Multilineage Gene Priming in Hematopoietic Stem Cells

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