Yap and Taz regulate retinal pigment epithelial cell fate

Area of Science:

• Developmental Biology
• Ophthalmology
• Genetics

Background:

• The optic vesicle contains progenitor cells that differentiate into retinal pigment epithelium (RPE) and neural retina.
• Initial RPE fate specification mechanisms remain poorly understood, despite known factors for RPE maintenance.

Purpose of the Study:

• To investigate the role of Yap/Taz-Tead signaling in the early determination of retinal pigment epithelium (RPE) cell identity.
• To elucidate the molecular mechanisms underlying RPE development and associated congenital ocular defects.

Main Methods:

• Utilized zebrafish models to study optic vesicle progenitor cell fate.
• Analyzed Yap/Taz-Tead activity, including nuclear localization and co-factor interactions.
• Generated yap and taz mutants, and examined overexpression effects on RPE development.

Main Results:

• Yap/Taz-Tead activity is both necessary and sufficient for optic vesicle progenitors to become RPE cells.
• Yap and Taz are essential for RPE formation; their absence leads to complete loss of RPE.
• Yap/Taz-dependent RPE determination requires Yap nuclear localization and Tead co-factor interaction.

Conclusions:

• Yap and Taz are identified as critical early regulators of retinal pigment epithelium (RPE) genesis.
• This study provides a mechanistic basis for understanding congenital ocular disorders like Sveinsson's chorioretinal atrophy and congenital retinal coloboma.