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PRDM3/16 Regulate Chromatin Accessibility Required for NKX2-1 Mediated Alveolar Epithelial Differentiations and Function [ATAC-seq]

ABSTRACT: Differential chromatin accessibility accompanies and mediates transcriptional control of diverse cell fates and their differentiation during embryogenesis. While the critical role of NKX2-1 and its transcritional targets in lung morphogenesis and pulmonary epithelial cell differentiation is increasingly known, mechanisms by which chromatin accessibility alters the epigenetic landscape to regulate NKX2-1 activites required for alveolar epithelial cell differentiation and function are not well understood. Herein, we demonstrate that the paird domain zinc finger transcriptional regulators PRDM3 and PRDM16 regulate chromatin accessibility required for NKX2-1 mediated AT1 and AT2 cell differentiation decisions during lung morphogenesis and for control of the induction of AT@ cell gene expression controlling alveolar function and ventilation at birth. PRDM3 and 16 were required for activation of AT2 cell-associated gene expression, enhancing chromatin accessibility at NKX2-1 transcriptional targets. NKX2-1, PRDM3, and PRDM16 bound together at cis-active DNA elements in AT2 and AT1 cell selective transcriptional target genes, including those critical for perinatal AT2 cell differentitaion, surfactant homeostasis, and innate host defense. Deletion of PRDM3/16 inhibited NKX2-1-dependent gene regulatory networks controlling surfactant lipid and protein production, resulting in respiratory failure at birth. NKX2-1-dependent regulation of alveolar epithelial cell differentiation is mediated by PRDM3/16.

ORGANISM(S): Mus musculus

PROVIDER: GSE250359 | GEO | 2024/03/01

REPOSITORIES: GEO

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Project description:Alveoli are thin-walled sacs that serve as the gas exchange units of the lung. They are affected in devastating lung diseases including COPD, Idiopathic Pulmonary Fibrosis, and the major form (adenocarcinoma) of lung cancer, the leading cause of cancer deaths. The alveolar epithelium is composed of two morphologically distinct cell types: alveolar type (AT) 1 cells, exquisitely thin cells across which oxygen diffuses to reach the blood, and AT2 cells, specialized surfactant-secreting cells. Classical studies suggested that AT1 cells arise from AT2 cells during development and following injury, but more recent studies suggest other sources. Here we use histological and marker analysis, lineage tracing, and clonal analysis in mice to identify alveolar progenitor and stem cells and map their locations and potential in vivo. The results show that AT1 and AT2 cells arise independently during development from a bipotential progenitor. After birth, new AT1 cells derive from rare, long-lived, self-renewing AT2 cells, each producing a slowly expanding clonal focus of regenerated alveoli contiguous with the founder AT2 cell. This stem cell function of AT2 cells is broadly activated by diffuse AT1 cell injury, and AT2 self-renewal can be induced in vitro by EGF ligands and permanently activated in vivo by AT2 cell-specific targeting of the oncogenic KrasG12D allele, efficiently transforming AT2 cells into monoclonal adenomatous tumors that rapidly enlarge and prove fatal. Thus, there is a developmental switch in alveolar progenitor cells after birth, when mature AT2 cells function as facultative stem cells that contribute to local alveolar renewal, repair, and cancer. We propose that short-range signals from dying AT1 cells regulate AT2 stem cell activity: a signal transduced by EGFR-KRAS controls AT2 self-renewal and is hijacked during oncogenic transformation, and a separate signal controls reprogramming to AT1 cell fate. To compare expression between ATII and E18 BP populations, RNA was isolated from either population purified by FACS. Two populations are analyzed with 3 biological replicates per population.

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PRDM3/16 Regulate Chromatin Accessibility Required for NKX2-1 Mediated Alveolar Epithelial Differentiations and Function [ATAC-seq]

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