Bidirectional Phosphorylation Changes in Opsins Associated With Early Myopia and Hyperopia Signal Regulation by...

Area of Science:

• Ophthalmology
• Molecular Biology
• Proteomics

Background:

• Lens-induced myopia (LIM) and lens-induced hyperopia (LIH) are significant conditions affecting vision.
• Post-translational modifications (PTMs), such as phosphorylation, play crucial roles in cellular signaling.
• Understanding PTMs in ocular development is key to addressing refractive errors.

Purpose of the Study:

• To investigate the role of phosphorylation in the pathogenesis of LIM and LIH.
• To identify specific phosphorylation sites and their modulation in response to induced refractive errors.

Main Methods:

• Utilized an untargeted phosphoproteomics approach to identify phosphorylation sites in chick retinas.
• Quantified phosphorylation level changes using tandem mass tag (TMT) technique.
• Employed targeted mass spectrometry for validation of phosphorylation changes in visual opsins.

Main Results:

• Identified differential phosphorylation at serine residues S334 (rhodopsin), S328 (violet-sensitive opsin), and S342 (blue-sensitive opsin).
• Observed dephosphorylation of these sites during myopia onset and sustained phosphorylation under hyperopic conditions.
• Demonstrated that optical conditions significantly modulate opsin phosphorylation patterns, impacting retinal signaling.

Conclusions:

• Opsin phosphorylation is bidirectionally modulated by optical factors in LIM and LIH.
• This modulation represents a potential mechanism linking optical stimuli to molecular signaling in ocular growth and adaptation.
• Findings provide insights into the molecular basis of refractive error development.