Decomposing a deterministic path to mesenchymal niche formation by two intersecting morphogen gradients
- PMID: 35421372
- PMCID: PMC9050909
- DOI: 10.1016/j.devcel.2022.03.011
Decomposing a deterministic path to mesenchymal niche formation by two intersecting morphogen gradients
Abstract
Organ formation requires integrating signals to coordinate proliferation, specify cell fates, and shape tissue. Tracing these events and signals remains a challenge, as intermediate states across many critical transitions are unresolvable over real time and space. Here, we designed a unique computational approach to decompose a non-linear differentiation process into key components to resolve the signals and cell behaviors that drive a rapid transition, using the hair follicle dermal condensate as a model. Combining scRNA sequencing with genetic perturbation, we reveal that proliferative Dkk1+ progenitors transiently amplify to become quiescent dermal condensate cells by the mere spatiotemporal patterning of Wnt/β-catenin and SHH signaling gradients. Together, they deterministically coordinate a rapid transition from proliferation to quiescence, cell fate specification, and morphogenesis. Moreover, genetically repatterning these gradients reproduces these events autonomously in "slow motion" across more intermediates that resolve the process. This analysis unravels two morphogen gradients that intersect to coordinate events of organogenesis.
Keywords: Wnt; dermal condensate; dermis; development; hair follicle; morphogen; niche; single-cell RNA-seq; sonic hedgehog.
Copyright © 2022 Elsevier Inc. All rights reserved.
Conflict of interest statement
Declaration of interests The authors declare no competing interests.
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