Neural crest and periderm-specific requirements of Irf6 during neural tube and craniofacial development

Area of Science:

• Developmental Biology
• Genetics
• Craniofacial Development

Background:

• Interferon Regulatory Factor 6 (IRF6) is crucial for craniofacial development, particularly in syndromic and non-syndromic cleft lip and palate.
• Global knockout of Irf6 in mice leads to neonatal lethality, hindering studies on its post-embryonic functions.
• Previous research identified Irf6's role in embryonic epithelium and periderm, but its function in non-epithelial cells remained unclear.

Purpose of the Study:

• To generate and characterize a novel floxed mouse model for Irf6 to enable conditional gene ablation.
• To investigate the role of Irf6 in periderm and neural crest cell lineages.
• To explore the post-embryonic and developmental functions of Irf6 in craniofacial development.

Main Methods:

• Generation of a conditional Irf6-floxed mouse model.
• Conditional ablation of Irf6 in periderm and neural crest lineages.
• Phenotypic analysis of Irf6-deficient embryos.

Main Results:

• Loss of Irf6 in periderm recapitulated a mild Irf6 null phenotype, highlighting its importance in embryonic development.
• Conditional ablation of Irf6 in neural crest cells led to anterior neural tube defects with variable penetrance.
• The new conditional allele facilitates detailed studies of Irf6 function in specific cell types.

Conclusions:

• IRF6 signaling in the periderm is critical for regulating embryonic development.
• IRF6 plays a role in neural crest development, impacting anterior neural tube formation.
• This conditional Irf6 mouse model provides a valuable tool for studying craniofacial development and post-natal functions.