CYP1B1 mutations in French patients with early-onset primary open-angle glaucoma

Area of Science:

• Ophthalmology
• Genetics
• Molecular Biology

Background:

• Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness globally, characterized by complex genetic underpinnings.
• While MYOCILIN (MYOC) and OPTINEURIN gene mutations are implicated in rare Mendelian forms of POAG, they account for less than 5% of cases.
• The CYP1B1 gene, a cytochrome P450 family member, is a primary cause of primary congenital glaucoma (PCG), a severe, recessively inherited blinding condition.

Purpose of the Study:

• To determine the potential role of CYP1B1 gene mutations in predisposing individuals to POAG.
• To investigate this association independently of the presence of MYOCILIN (MYOC) mutations.

Main Methods:

• The coding regions of the CYP1B1 gene were analyzed using denaturing high performance liquid chromatography (DHPLC) and sequencing.
• The study included 236 unrelated French Caucasian POAG patients and 47 age- and ethnicity-matched controls.

Main Results:

• Eleven POAG patients (4.6%) were found to carry one or two mutated CYP1B1 genes without any MYOC mutation.
• These patients exhibited significantly earlier disease onset (median age 40 years, range 13-52) compared to non-carriers.
• Most identified CYP1B1 mutations in POAG patients had previously been linked to PCG.

Conclusions:

• CYP1B1 mutations may represent a significant risk factor for developing early-onset POAG.
• These mutations could also influence the glaucoma phenotype in patients lacking MYOCILIN (MYOC) mutations.