Chromatin and Transcriptional Analysis of Mesoderm Progenitor Cells Identifies HOPX as a Regulator of Primitive Hematopoiesis.

Chromatin and Transcriptional Analysis of Mesoderm Progenitor Cells Identifies HOPX as a Regulator of Primitive Hematopoiesis.
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中胚层祖细胞的染色质和转录分析将Hopx鉴定为原始造血的调节剂。

DOI:
10.1016/j.celrep.2017.07.067
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发表时间:
2017-08-15
期刊:
影响因子:
8.8
通讯作者:
Murry CE
Murry CE
中科院分区:
生物学1区
文献类型:
--
作者:
Palpant NJ;Wang Y;Hadland B;Zaunbrecher RJ;Redd M;Jones D;Pabon L;Jain R;Epstein J;Ruzzo WL;Zheng Y;Bernstein I;Margolin A;Murry CE

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我们分析了人胚胎干细胞 (hESC) 来源的心脏祖细胞 (CPC) 和不同中胚层来源产生的 KDR+/CD34+ 内皮细胞的染色质动力学和转录活性。使用无偏算法对染色质和转录水平上调节的基因进行分层排序,我们确定了中胚层谱系决定的候选调节因子。 HOPX 是一种非 DNA 结合同源域蛋白,被确定为造血内皮细胞的候选调节因子。使用 HOPX 报告基因和敲除 hESC,我们发现 HOPX 调节血液形成。 HOPX 的缺失不会影响内皮命运规范,但会显着降低原始造血功能,至少部分是通过未能抑制 Wnt/β-catenin 信号传导而发挥作用。因此,染色质状态分析可以鉴定中胚层规范的调节因子,包括 HOPX 在控制原始造血过程中的保守作用。帕尔潘特等人。分析源自 hPSC 的心血管祖细胞的基因表达和染色质动态,以阐明控制细胞命运的基因。 HOPX 被认为是原始造血的调节剂,为疾病建模或治疗应用的多能性控制细胞谱系提供了见解。
We analyzed chromatin dynamics and transcriptional activity of human embryonic stem cell (hESC)-derived cardiac progenitor cells (CPCs) and KDR+/CD34+ endothelial cells generated from different mesodermal origins. Using an unbiased algorithm to hierarchically rank genes modulated at the level of chromatin and transcription, we identified candidate regulators of mesodermal lineage determination. HOPX, a non-DNA binding homeodomain protein, was identified as a candidate regulator of blood-forming endothelial cells. Using HOPX reporter and knockout hESCs we show that HOPX regulates blood formation. Loss of HOPX does not impact endothelial fate specification but markedly reduces primitive hematopoiesis, acting at least in part through failure to suppress Wnt/β-catenin signaling. Thus, chromatin state analysis permits identification of regulators of mesodermal specification, including a conserved role for HOPX in governing primitive hematopoiesis. Palpant et al. analyze gene expression and chromatin dynamics in cardiovascular progenitor cells derived from hPSCs to elucidate genes governing cell fate. HOPX is identified as a regulator of primitive hematopoiesis, providing insight into controlling cell lineages from pluripotency for disease modeling or therapeutic applications.
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