Ocular genetics in the Japanese population

Area of Science:

• Ophthalmology
• Human Genetics
• Molecular Biology

Background:

• Genetic variations in ocular diseases are influenced by patient ethnicity.
• Advances in ocular genetics have significantly improved diagnostic capabilities over the past three decades.
• Understanding ethnic-specific genetic factors is crucial for diagnosing and managing inherited eye diseases globally.

Purpose of the Study:

• To review genetic findings in Japanese patients with inherited eye diseases.
• To highlight the genotype-phenotype correlations in corneal and retinal dystrophies.
• To discuss complex genetic factors and present unique case studies in ocular genetics.

Main Methods:

• Analysis of genetic variations in Japanese patients with inherited eye diseases.
• Evaluation of genotype-phenotype relationships in corneal dystrophy and inherited retinal dystrophy (IRD).
• Identification of gene sequences, including the EYS gene, and analysis of complex gene clusters.

Main Results:

• Mutations in the EYS gene are a frequent cause of autosomal recessive retinitis pigmentosa (RP).
• RPGRIP1 is identified as a common causative gene for early-onset severe retinal dystrophy, including Leber congenital amaurosis.
• Complex gene structures and unique genetic conditions like uniparental disomy were observed.

Conclusions:

• Accurate diagnosis, genetic pattern determination, and genetic counseling are vital in genome medicine for inherited eye diseases.
• Understanding the precise effects of genetic variants can explain clinical variations among patients.
• Enhanced understanding of ocular genetics, considering ethnic backgrounds, improves patient care and genetic counseling.