TAp73 is a central transcriptional regulator of airway multiciliogenesis

Area of Science:

• Cell Biology
• Respiratory Medicine
• Genetics

Background:

• Motile multiciliated cells (MCCs) are crucial for airway clearance of pathogens and pollutants.
• The transcriptional regulation of multiciliogenesis, the process of forming multiple cilia, is not well understood.
• Dysfunctional MCCs are linked to respiratory diseases and human ciliopathies.

Purpose of the Study:

• To identify key transcriptional regulators of airway multiciliogenesis.
• To elucidate the role of TP73 in MCC differentiation and function.
• To understand the molecular mechanisms underlying TAp73-mediated multiciliogenesis.

Main Methods:

• Utilized a mouse model with TP73 deficiency to study respiratory tract infections and ciliogenesis.
• Employed organotypic airway cultures to assess the necessity and sufficiency of TAp73 in MCC differentiation.
• Conducted cross-species genomic analyses and ciliary rescue experiments in knockout MCCs.

Main Results:

• TP73 deficiency in mice leads to chronic respiratory infections, defective ciliogenesis, and loss of mucociliary clearance.
• TAp73 is essential and sufficient for basal body docking, axonemal extension, and motility in differentiating MCC progenitors.
• TAp73 acts as a conserved transcriptional integrator, directly activating key regulators (e.g., FoxJ1, Rfx2, Rfx3) and numerous ciliary genes.

Conclusions:

• TP73 is identified as a central regulator governing airway multiciliogenesis.
• TAp73 plays a critical role in establishing functional MCCs for effective mucociliary clearance.
• The findings reveal TAp73 as a potential therapeutic target for respiratory diseases linked to ciliopathies.