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In Vitro and In Vivo Development of the Human Airway at Single-Cell Resolution.

Developmental cell (2020-02-29)
Alyssa J Miller, Qianhui Yu, Michael Czerwinski, Yu-Hwai Tsai, Renee F Conway, Angeline Wu, Emily M Holloway, Taylor Walker, Ian A Glass, Barbara Treutlein, J Gray Camp, Jason R Spence
ABSTRACT

Bud tip progenitor cells give rise to all murine lung epithelial lineages and have been described in the developing human lung; however, the mechanisms controlling human bud tip differentiation into specific lineages are unclear. Here, we used homogeneous human bud tip organoid cultures and identified SMAD signaling as a key regulator of the bud tip-to-airway transition. SMAD induction led to the differentiation of airway-like organoids possessing functional basal cells capable of clonal expansion and multilineage differentiation. To benchmark in vitro-derived organoids, we developed a single-cell mRNA sequencing atlas of the human lung from 11.5 to 21 weeks of development, which revealed high degrees of similarity between the in vitro-derived and in vivo airway. Together, this work sheds light on human airway differentiation in vitro and provides a single-cell atlas of the developing human lung.

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