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Genotype-Phenotype Correlations in CYP1B1-Associated Primary Congenital Glaucoma Patients Representing Two Large
Mônica Barbosa de Melo1, Anil K Mandal2, Ivan M Tavares3
1Center of Molecular Biology and Genetic Engineering, University of Campinas, Campinas, SP, Brazil.
Insights
This study found no link between CYP1B1 gene mutations and the initial presentation of primary congenital glaucoma (PCG) in Indian and Brazilian children. Further research is needed to understand long-term disease progression related to these genetic variations.
Area of Science:
- Ophthalmology
- Genetics
- Pediatrics
Background:
- Primary congenital glaucoma (PCG) stems from developmental defects in the eye's anterior chamber angle.
- The CYP1B1 gene is frequently implicated in PCG globally, but its clinical implications remain unclear.
- This study investigated PCG in Indian and Brazilian cohorts, focusing on CYP1B1 mutations.
Purpose of the Study:
- To analyze the clinical profile of PCG patients with CYP1B1 mutations.
- To investigate genotype-phenotype correlations in PCG across Indian and Brazilian populations.
- To assess the impact of specific CYP1B1 mutations (R368H in India, 4340delG in Brazil) on PCG traits.
Main Methods:
- Genotype-phenotype correlations were performed on 451 PCG cases (301 Indian, 150 Brazilian).
- Demographic (gender, consanguinity) and clinical (intraocular pressure, corneal diameter) parameters were analyzed.
- Multivariate logistic regression models were used to estimate adjusted odds ratios.
Main Results:
- Mutation spectra were similar between Indian and Brazilian PCG cases, with differences in homozygous/compound heterozygous mutations.
- Significant allelic heterogeneity was observed, with few shared mutations between populations.
- No significant associations were found between CYP1B1 mutations and demographic or clinical parameters at presentation.
Conclusions:
- The study found no genotype-phenotype correlation for demographic and clinical traits in PCG related to CYP1B1 mutations at the time of diagnosis.
- The long-term impact of these CYP1B1 mutations on PCG progression requires further investigation.
Background:
Primary congenital glaucoma (PCG), occurs due to the developmental defects in the trabecular meshwork and anterior chamber angle in children. PCG exhibits genetic heterogeneity and the CYP1B1 gene has been widely implicated worldwide. Despite the diverse mutation spectra, the clinical implications of these mutations are yet unclear. The present study attempted to delineate the clinical profile of PCG in the background of CYP1B1 mutations from a large cohort of 901 subjects from India (n=601) and Brazil (n=300).
Methods:
Genotype-phenotype correlations was undertaken on clinically well characterized PCG cases from India (n=301) and Brazil (n=150) to assess the contributions of CYP1B1 mutation on a set of demographic and clinical parameters. The demographic (gender, and history of consanguinity) and quantitative clinical (presenting intraocular pressure [IOP] and corneal diameter [CD]) parameters were considered as binary and continuous variables, respectively, for PCG patients in the background of the overall mutation spectra and also with respect to the prevalent mutations in India (R368H) and Brazil (4340delG). All these variables were fitted in a multivariate logistic regression model using the Akaike Information Criterion (AIC) to estimate the adjusted odds ratio (OR) using the R software (version 2.14.1).
Results:
The overall mutation spectrum were similar across the Indian and Brazilian PCG cases, despite significantly higher number of homozygous mutations in the former (p=0.024) and compound heterozygous mutations in the later (p=0.012). A wide allelic heterogeneity was observed and only 6 mutations were infrequently shared between these two populations. The adjusted ORs for the binary (demographic) and continuous (clinical) variables did not indicate any susceptibility to the observed mutations (p>0.05).
Conclusions:
The present study demonstrated a lack of genotype-phenotype correlation of the demographic and clinical traits to CYP1B1 mutations in PCG at presentation. However, the susceptibility of these mutations to the long-term progression of these traits are yet to be deciphered.
