Transcriptomics reveals complex kinetics of dorsal-ventral patterning gene expression in the mandibular arch

Area of Science:

• Developmental biology
• Genetics
• Computational biology

Background:

• The mandibular arch, forming jaws in vertebrates, is patterned along its dorsal-ventral axis by a gene regulatory network.
• While spatial domains are known, the temporal dynamics of this patterning remain poorly understood.

Purpose of the Study:

• To investigate the temporal dynamics of dorsal-ventral patterning gene expression in pharyngeal arch development.
• To understand how gene expression kinetics influence cell fate trajectories and craniofacial development.

Main Methods:

• Quantitative gene expression analysis using NanoString technology in zebrafish and mouse pharyngeal arch primordia.
• Development and refinement of computational models incorporating gene expression kinetics.

Main Results:

• Genes within similar dorsal-ventral domains exhibit diverse temporal expression profiles.
• Similar temporal dynamics were observed in genes from distinct regulatory pathways, suggesting shared regulatory mechanisms.
• Incorporating gene expression kinetics improved computational model accuracy for mandibular arch patterning.

Conclusions:

• The timing and magnitude of gene expression significantly diversify cellular responses to patterning signals during craniofacial development.
• Kinetic profiles provide insights into cell fate determination and enable better interspecies comparisons in developmental studies.