谱系选择超级增强子在人骨髓间充质干细胞成脂和成骨分化过程中调节核心调控回路。

Lineage-selective super enhancers mediate core regulatory circuitry during adipogenic and osteogenic differentiation of human mesenchymal stem cells.

机构信息

Key Laboratory of Biomedical Information Engineering of Ministry of Education, Biomedical Informatics & Genomics Center, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P. R. China.

Honghui Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, 710054, P. R. China.

出版信息

Cell Death Dis. 2022 Oct 12;13(10):866. doi: 10.1038/s41419-022-05309-3.

Abstract

Human mesenchymal stem cells (hMSCs) can be differentiated into osteoblasts and adipocytes. During these processes, super enhancers (SEs) play important roles. Here, we performed comprehensive characterization of the SEs changes associated with adipogenic and osteogenic differentiation of hMSCs, and revealed that SEs changed more dramatically compared with typical enhancers. We identified a set of lineage-selective SEs, whose target genes were enriched with cell type-specific functions. Functional experiments in lineage-selective SEs demonstrated their specific roles in directed differentiation of hMSCs. We also found that some key transcription factors regulated by lineage-selective SEs could form core regulatory circuitry (CRC) to regulate each other's expression and control the hMSCs fate determination. In addition, we found that GWAS SNPs of osteoporosis and obesity were significantly enriched in osteoblasts-selective SEs or adipocytes-selective SEs, respectively. Taken together, our studies unveiled important roles of lineage-selective SEs in hMSCs differentiation into osteoblasts and adipocytes.

摘要

人类间充质干细胞(hMSCs)可分化为成骨细胞和脂肪细胞。在这个过程中,超级增强子(SEs)发挥着重要作用。在这里,我们对 hMSCs 成脂和成骨分化过程中与 SEs 变化相关的进行了全面的特征描述,结果表明 SEs 的变化比典型增强子更为显著。我们鉴定了一组谱系特异性 SEs,其靶基因富含细胞类型特异性功能。在谱系特异性 SEs 中的功能实验证明了它们在 hMSCs 定向分化中的特定作用。我们还发现,一些由谱系特异性 SEs 调控的关键转录因子可以形成核心调控回路(CRC)来调控彼此的表达,并控制 hMSCs 的命运决定。此外,我们发现骨质疏松症和肥胖症的 GWAS SNP 分别显著富集在成骨细胞特异性 SEs 或脂肪细胞特异性 SEs 中。总之,我们的研究揭示了谱系特异性 SEs 在 hMSCs 分化为成骨细胞和脂肪细胞中的重要作用。

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