P73 C-terminus is dispensable for multiciliogenesis

Area of Science:

• Molecular Biology
• Developmental Biology
• Genetics

Background:

• The p53 family transcriptional factor p73 is crucial for development.
• p73 knockout mice exhibit neurodevelopmental defects, inflammation, and infertility.
• The full-length N-terminal isoform TAp73 regulates multiciliogenesis.

Purpose of the Study:

• Investigate the in vivo role of p73 C-terminal isoforms using a novel mouse model.
• Determine if p73 C-terminal isoforms are essential for multiciliogenesis.

Main Methods:

• Generated Trp73Δ13/Δ13 mice with an exon 13 deletion.
• Analyzed TAp73 expression patterns in wild-type and mutant mice.
• Examined ciliated epithelial lining in airways and brain ependyma.

Main Results:

• Trp73Δ13/Δ13 mice exhibit an alpha to beta isoform switch without altering TAp73 expression.
• Airway ciliated epithelium remains unaffected, suggesting p73β compensates for p73α.
• Brain ependyma shows no TAp73 expression, indicating compensatory mechanisms.

Conclusions:

• p73 C-terminal isoforms are dispensable for the multiciliogenesis program.
• Alternative splicing of p73 may have tissue-specific functional effects.