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Reporter‐based fate mapping in human kidney organoids confirms nephron lineage relationships and reveals synchronous nephron formation

机译:基于记者的人类肾脏类器官中的命运图谱证实了肾单位的血统关系并揭示了同步肾单位的形成

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摘要

Nephron formation continues throughout kidney morphogenesis in both mice and humans. Lineage tracing studies in mice identified a self‐renewing Six2‐expressing nephron progenitor population able to give rise to the full complement of nephrons throughout kidney morphogenesis. To investigate the origin of nephrons within human pluripotent stem cell‐derived kidney organoids, we performed a similar fate‐mapping analysis of the 2‐expressing lineage in induced pluripotent stem cell ( )‐derived kidney organoids to explore the feasibility of investigating lineage relationships in differentiating s . Using /Cas9 gene‐edited lineage reporter lines, we show that 2‐expressing cells give rise to nephron epithelial cell types but not to presumptive ureteric epithelium. The use of an inducible (Cre 2) line revealed a declining capacity for 2 cells to contribute to nephron formation over time, but retention of nephron‐forming capacity if provided an exogenous signal. Hence, while human ‐derived kidney tissue appears to maintain lineage relationships previously identified in developing mouse kidney, unlike the developing kidney , kidney organoids lack a nephron progenitor niche capable of both self‐renewal and ongoing nephrogenesis.
机译:在小鼠和人类中,肾素的形成贯穿整个肾脏形态发生。在小鼠中进行的血统追踪研究确定了一个自我更新的表达Six2的肾单位祖群,能够在整个肾脏形态发生过程中产生完整的肾单位。为了研究人多能干细胞来源的肾脏类器官中肾单位的起源,我们对诱导多能干细胞()的肾脏类器官中表达2的谱系进行了相似的命运图分析,以探讨研究血统关系的可行性。区分s。使用/ Cas9基因编辑的谱系报告基因系,我们显示表达2的细胞会产生肾单位上皮细胞类型,但不会引起输尿管上皮细胞。诱导性(Cre 2)系的使用显示,随着时间的流逝,2个细胞促进肾单位形成的能力下降,但如果提供外源信号,则保留肾单位形成能力。因此,尽管人类来源的肾脏组织似乎保持了先前在发育中的小鼠肾脏中所确定的谱系关系,但与发育中的肾脏不同,肾脏的类器官缺乏能自我更新和持续进行肾生成的肾单位祖细胞。

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