Developmental dynamics of the neural crest-mesenchymal axis in creating the thymic microenvironment.

Developmental dynamics of the neural crest-mesenchymal axis in creating the thymic microenvironment.
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DOI:
10.1126/sciadv.abm9844
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发表时间:
2022-05-13
期刊:
影响因子:
13.6
通讯作者:
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中科院分区:
综合性期刊1区
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胸腺基质由上皮性细胞和非上皮性细胞组成,提供了独立的微环境,控制着造血祖细胞到功能T细胞的归巢、分化和选择。在这里,我们在单细胞分辨率下探索人和小鼠胸腺不同发育阶段非上皮间质室的复杂成分和动态变化,以及在DiGeorge综合征的实验模型中,DiGeorge综合征是人类胸腺发育不良的最常见形式。检测到的基因表达特征识别了以前未知的基质亚型,并将它们的单个分子图谱与不同的分化轨迹和功能相关联,揭示了不同类型细胞在不同发育阶段出现的前所未有的异质性,它们在关键调控信号通路和细胞外基质成分的表达上存在差异。总之,这些发现突出了非上皮性胸腺基质的动态复杂性,并将其与正常胸腺器官发生和组织维持所必需的不同指导作用联系起来。胸腺间质的单细胞图谱确定了神经脊细胞对胸腺间充质的动态贡献。
The thymic stroma is composed of epithelial and nonepithelial cells providing separate microenvironments controlling homing, differentiation, and selection of hematopoietic precursor cells to functional T cells. Here, we explore at single-cell resolution the complex composition and dynamic changes of the nonepithelial stromal compartment across different developmental stages in the human and mouse thymus, and in an experimental model of the DiGeorge syndrome, the most common form of human thymic hypoplasia. The detected gene expression signatures identify previously unknown stromal subtypes and relate their individual molecular profiles to separate differentiation trajectories and functions, revealing an unprecedented heterogeneity of different cell types that emerge at discrete developmental stages and vary in their expression of key regulatory signaling circuits and extracellular matrix components. Together, these findings highlight the dynamic complexity of the nonepithelial thymus stroma and link this to separate instructive roles essential for normal thymus organogenesis and tissue maintenance. Single-cell profiling of thymic stroma identifies a dynamic contribution from neural crest cells to the thymic mesenchyme.
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