Genome-wide association meta-analysis highlights light-induced signaling as a driver for refractive error

Area of Science:

• Genetics
• Ophthalmology
• Molecular Biology

Background:

• Refractive errors, including myopia, are prevalent global eye disorders and a leading cause of blindness.
• Understanding the genetic underpinnings of refractive errors is crucial for developing effective interventions.

Purpose of the Study:

• To expand the understanding of genetic loci associated with refractive errors through a large-scale genome-wide association meta-analysis.
• To investigate the biological mechanisms and cell types involved in refractive error development.

Main Methods:

• Genome-wide association meta-analysis of 160,420 participants, with replication in 95,505 individuals.
• In silico analyses and expression experiments to identify functional mechanisms.
• Examination of genetic correlations between European and Asian populations.

Main Results:

• Increased the number of established independent genetic signals for refractive errors from 37 to 161.
• Identified significant genetic correlation (>0.78) between European and Asian populations.
• Highlighted the involvement of retinal cell physiology, light processing, and novel mechanisms like synaptic neurotransmission and angiogenesis.

Conclusions:

• Refractive errors are influenced by a complex genetic architecture involving multiple cell types within the retina and associated structures.
• A light-dependent retina-to-sclera signaling cascade is implicated in refractive error development.
• Post-transcriptional regulation via small RNAs may play a role in refractive error pathogenesis.