Genome-wide association identifies novel ROP risk loci in a multiethnic cohort.

Area of Science:

• Genetics
• Ophthalmology
• Pediatrics

Background:

• Retinopathy of prematurity (ROP) is a significant cause of childhood blindness in premature infants.
• Genetic factors are implicated in ROP susceptibility, but specific loci remain largely unidentified.
• Understanding genetic risk can aid in early detection and intervention strategies for ROP.

Purpose of the Study:

• To conduct a genome-wide association study (GWAS) to identify genetic loci associated with retinopathy of prematurity (ROP) risk.
• To investigate the role of the identified genetic variants in ocular development and disease.
• To explore potential ethnic variations in genetic susceptibility to ROP.

Main Methods:

• Performed a genome-wide association study in a multiethnic cohort of 920 at-risk infants.
• Utilized stringent statistical thresholds for genome-wide significance (p < 5x10^-8) and suggestive significance (p < 5x10^-6).
• Conducted in-silico analyses, genetic risk score analysis, and expression profiling in human eye tissues to assess gene relevance.

Main Results:

• Identified one locus (rs2058019) at genome-wide significance (p=4.96x10^-9) for ROP ≥ stage 3, primarily driven by Hispanic and European ancestry infants.
• Discovered nine additional loci with suggestive significance (p < 5x10^-6).
• The lead SNP rs2058019 is located within an intron of the Glioma-associated oncogene family zinc finger 3 (GLI3) gene, implicated in retinal biology.

Conclusions:

• A novel genetic locus within the GLI3 gene is associated with increased risk for retinopathy of prematurity.
• GLI3 and other identified genes show relevance to human ocular disease, supporting their role in retinal development.
• Genetic susceptibility to ROP may exhibit variability across different racial and ethnic groups.