Comparative analysis of neural crest development in the chick and mouse

Area of Science:

• Developmental Biology
• Genetics
• Comparative Genomics

Background:

• Gene regulatory networks (GRNs) governing neural crest (NC) cell development are incompletely understood due to reliance on indirect comparisons across model organisms.
• Limited insights exist into the diversity and conservation of genes involved in NC cell differentiation and invasion.

Purpose of the Study:

• To investigate conserved transcriptional signatures in neural crest cell migration using avian and mouse embryos.
• To identify novel genes and pathways involved in neural crest cell development and migration.

Main Methods:

• Integrated analysis of chick (HH13) and mouse (E9.5) embryo tissue samples during NC cell migration.
• Comparative analysis of gene expression in pharyngeal arches 1-2 (PA1 and PA2).
• Multiplexed FISH to confirm gene expression in leader mouse NCs.

Main Results:

• Identified a shared cluster of NC cells in mouse and chick expressing Lmo4, Tfap2B, Sox10, and Twist1.
• Discovered a conserved transcriptional signature in the NC cell migratory wavefront, including KAZALD1, BAMBI, DES, and GPC3.
• Confirmed restricted expression of these genes to leader mouse NCs.

Conclusions:

• Novel insights into transcriptional programs underlying NC cell migration were revealed.
• Established a foundation for future comparative functional analyses of NC cell development.
• Highlighted conserved and novel genes critical for NC cell migration.