Bardet-Biedl Syndrome proteins regulate cilia disassembly during tissue maturation

Area of Science:

• Cell Biology
• Developmental Biology
• Ophthalmology

Background:

• Primary cilia are vital organelles for cellular communication, organogenesis, and tissue homeostasis.
• The retinal pigment epithelium (RPE) is essential for visual function and undergoes maturation.
• The role of primary cilia in RPE maturation has been largely unexplored.

Purpose of the Study:

• To investigate the role of primary cilia in RPE development and maturation.
• To elucidate the mechanisms regulating primary cilia disassembly during RPE maturation.
• To understand the impact of cilia regulation on Wnt signaling in the RPE.

Main Methods:

• Immunofluorescence microscopy to visualize primary cilia.
• Quantitative analysis of ciliary length and protein localization.
• Gene expression analysis of ciliary disassembly components.
• Functional assays in Bardet-Biedl syndrome (BBS) deficient cells.

Main Results:

• Primary cilia are transiently present during RPE development and retract as the RPE matures.
• Ciliary-associated BBS proteins protect primary cilia from disassembly by recruiting Inversin.
• Inhibition of ciliary disassembly components rescues ciliary length defects in BBS-deficient cells.
• Primary cilia regulate Wnt signaling pathways critical for RPE maturation.

Conclusions:

• Primary cilia play a critical, transient role in RPE maturation.
• BBS proteins and Inversin are key regulators of primary cilia disassembly in the RPE.
• Cilia-mediated Wnt signaling is essential for proper RPE development and visual function.