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0The paper introduces 3D DNase-Enhanced Expression Profiling (3DEEP), a novel spatial transcriptomics method designed to map the complex development of organs in four dimensions. By removing genomic DNA and clearing tissue, researchers captured hundreds of developing hair follicles within thick sections of neonatal mouse skin, effectively preserving their intricate three-dimensional structures. The study utilizes a "spatial snapshot" to order these follicles by molecular age, creating a comprehensive timeline of organogenesis that identifies three distinct stages of maturation. This 4D molecular map reveals specific structural transformations, such as the stratification of stem cell compartments and the multi-step choreography of hair canal formation. Finally, the text compares healthy samples to genetically hairless mice, discovering that their developmental failure is preceded by molecular delays and a lack of coordination across the organ.
References:
Asami S, Yin C, Fan J, et al. Four-dimensional molecular mapping from a spatial snapshot reveals the dynamics of hair follicle organogenesis[J]. Cell, 2026.
