Embryo-scale single-cell chemical transcriptomics reveals dependencies between cell types and signaling pathways

Area of Science:

• Developmental Biology
• Genomics
• Zebrafish Model Organisms

Background:

• Organogenesis relies on intercellular signaling for cell type specification.
• A comprehensive understanding of signaling pathway dependencies in developing tissues is lacking.

Purpose of the Study:

• To investigate the molecular effects of inhibiting seven major developmental signaling pathways.
• To identify novel cell types and signaling dependencies in zebrafish pectoral fin development.

Main Methods:

• Large-scale single-cell RNA sequencing (scRNA-seq) of over two million whole zebrafish embryos.
• Systematic inhibition of seven major developmental signaling pathways.
• Focus on pectoral fin development to identify rare cell types and regulatory networks.

Main Results:

• Detailed molecular profiles of cell types across the zebrafish embryo under pathway inhibition.
• Discovery of two novel pectoral fin cell types: distal mesenchyme and tenocytes.
• Identification of previously unknown signaling pathway dependencies in pectoral fin formation.

Conclusions:

• This study provides a comprehensive resource for understanding signaling in organogenesis.
• The findings reveal new insights into pectoral fin development and cell type specification.
• The generated data enables rapid assessment of signaling pathway roles in diverse tissue development.