Association between SRBD1 and ELOVL5 gene polymorphisms and primary open-angle glaucoma

Area of Science:

• Ophthalmology
• Genetics
• Glaucoma Research

Background:

• Normal-tension glaucoma (NTG) and primary open-angle glaucoma (POAG) are leading causes of irreversible blindness.
• S1 RNA binding domain 1 (SRBD1) and elongation of long-chain fatty acids family member 5 (ELOVL5) have been implicated in early-onset NTG.
• Investigating genetic associations in POAG, including late-onset NTG and high-tension glaucoma (HTG), is crucial for understanding disease mechanisms.

Purpose of the Study:

• To investigate the association of SRBD1 (rs3213787) and ELOVL5 (rs735860) gene polymorphisms with primary open-angle glaucoma (POAG).
• To determine if these genetic factors are linked to different subtypes of POAG, including normal-tension glaucoma (NTG) and high-tension glaucoma (HTG).

Main Methods:

• A case-control study involving 370 Japanese POAG patients (158 NTG, 212 HTG) and 191 control subjects.
• Genotyping of SRBD1 (rs3213787) and ELOVL5 (rs735860) polymorphisms using established methods.
• Statistical analysis to compare allele and genotype frequencies between patient groups and controls.

Main Results:

• The A allele of SRBD1 (rs3213787) was significantly more frequent in both NTG and HTG patients compared to controls.
• This association remained significant even when considering only late-onset NTG (diagnosed after age 60).
• ELOVL5 (rs735860) risk genotypes (CC or CT) were associated with older age at diagnosis and a higher frequency of family history in POAG patients.

Conclusions:

• SRBD1 gene polymorphism is a significant risk factor for both normal-tension glaucoma (NTG) and high-tension glaucoma (HTG), including late-onset forms.
• ELOVL5 gene polymorphism is associated with typical POAG, suggesting a potential role in later-onset disease rather than early-onset forms.