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Genome-wide quantitative functional enhancer map of mESCs, in the pluripotent state and after induced differentiation

ABSTRACT: Precise spatiotemporally regulated gene expression is pivotal for cell homeostasis, cell differentiation and during development. Gene expression networks are tightly regulated by transcription factors (TF) and their targeted regulatory genomic elements (enhancers), which are known to correlate with specific histone modifications. However, the ultimate prerequisites, which determine functionally active enhancers, remain unclear. To elucidate the regulatory landscape of murine ESCs, a massively parallel reporter assay, based on STARR-seq (Self-Transcribing Active Regulatory Region sequencing), assessing genomic fragments prepared from accessible chromatin, (FAIRE-STARR-seq) has been applied. Thus, a genome-wide quantitative map of functional mESC enhancers in naive state and after retinoic acid (RA)-induced differentiation was generated. To investigate sequence features associated with RA-mediated inducibility of enhancers bound by retinoic acid receptor alpha (RARα), the main receptor for RA, genomic binding sites of RARα have been determined.

ORGANISM(S): Mus musculus

PROVIDER: GSE171771 | GEO | 2021/10/21

REPOSITORIES: GEO

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Project description:We defined the RARα interactome in the MDA-MB453 breast cancer cell line genetically engineered to over-express an N-terminally tagged version of the nuclear retinoic acid receptor. Twenty eight nuclear proteins which interact with RARα and whose interaction is stimulated or reduced by the pan-RAR ligand, all-trans retinoic acid (ATRA) were identified. Given the potential significance of the S100A3 calcium-binding protein in the control of tumor progression, we focused our attention on this factor. Using the two models represented by the ATRA-sensitive SKBR3 and MCF7 breast cancer cell lines characterized by constitutive expression of S100A3 and RARα, we demonstrate that the endogenous forms of S100A3 and RARα interact in physiological conditions. The interaction of S100A3 with RARα is cell context independent and it is observed not only in breast cancer but also in acute promyelocytioc leukemia (APL) cells, characterized by expression of the RARα-derived PML-RARα oncogene, which is the product of the t(15:17) chromosomal translocation. S100A3 interacts directly and specifically with RARα and PML-RARα, being unable to bind other members of the RAR/RXR family of retinoid nuclear receptors. The interaction surface maps to the carboxyl-terminal region of the RARα ligand binding domain. Binding of S100A3 to RARα and PML-RARα controls the constitutive and ATRA-dependent degradation of the two receptors. Silencing of the S100A3 gene decreases the amounts of RARα in breast SK-BR-3 and lung A549 cancer cells, rendering them more refractory to the anti-proliferative action of ATRA. In SK-BR-3 cells, this effect is accompanied by a decrease in the lactogenic/differentiating action of ATRA. In APL-derived NB4 cells, S100A3 knock-down reduces the amounts of both RARα and PML-RARα. Contemporaneous down-regulation of the two receptors is associated with an increase in the basal and ATRA-induced expression of many granulocytic differentiation markers. Opposite on RARα and PML-RARα levels as well as ATRA induced differentiation markers are observed upon over-expression of S100A3 in NB4 cells.

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Genome-wide quantitative functional enhancer map of mESCs, in the pluripotent state and after induced differentiation

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