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Distinct gene expression profiles underlie morphological and etiological differences in pediatric cataracts
Shaika Shanbagh1,2, Jyoti Matalia3, Ramaraj Kannan1
1GROW Research Laboratory, Narayana Nethralaya Foundation, Bengaluru, Karnataka, India.
Insights
Pediatric cataract gene expression varies by cause and type, revealing a complex network of genes involved in childhood blindness. Understanding these patterns is key to developing targeted treatments.
Area of Science:
- Ophthalmology
- Genetics
- Developmental Biology
Background:
- Pediatric cataract is a leading cause of preventable childhood blindness globally.
- The precise mechanisms underlying human pediatric cataract development are not fully understood.
- Existing knowledge gaps hinder effective therapeutic strategies for childhood cataracts.
Purpose of the Study:
- To investigate gene expression profiles in distinct forms of pediatric cataracts.
- To correlate gene expression patterns with specific cataract phenotypes and etiologies.
- To elucidate the molecular basis of pediatric cataractogenesis.
Main Methods:
- A cross-sectional study of 89 pediatric cataract patients across various subtypes (infectious, non-infectious, traumatic, etc.).
- Analysis of gene expression for structural (Aqp-0, HspA4/Hsp70, CrygC), transcription factors (Tdrd7, FoxE3, Maf, Pitx 3), and profibrotic genes (Tgfβ, Bmp7, αSmA, vimentin).
- Comparison of gene expression in cataractous lenses versus clear, non-cataractous lens material.
Main Results:
- Lens gene expression profiles were uniquely associated with specific cataract subtypes and causes.
- Altered FoxE3 expression was observed in postnatal cataracts; low Tdrd7 correlated with posterior subcapsular opacity.
- Elevated Aqp0 and Maf expression were noted in infectious cataracts (especially CMV), while vimentin was elevated in infectious and prenatal cataracts.
Conclusions:
- Distinct pediatric cataract subtypes exhibit unique gene expression patterns, suggesting specific regulatory mechanisms in cataractogenesis.
- Cataract formation is linked to the dysregulation of a complex gene network.
- These findings provide insights into the molecular pathways driving pediatric cataracts.
Purpose:
Pediatric cataract is a major cause of preventable childhood blindness worldwide. Although genetic mutations or infections have been described in patients, the mechanistic basis of human cataract development remains poorly understood. Therefore, gene expression of structural, developmental, profibrotic, and transcription factors in phenotypically and etiologically distinct forms of pediatric cataracts were evaluated.
Methods:
This cross-sectional study included 89 pediatric cataract subjects subtyped into 1) prenatal infectious (cytomegalovirus, rubella, and combined cytomegalovirus with rubella infection), 2) prenatal non-infectious, 3) posterior capsular anomalies, 4) postnatal, 5) traumatic, and 6) secondary, and compared to clear, non-cataractous material of eyes with the subluxated lenses. Expression of lens structure-related genes (Aqp-0, HspA4/Hsp70, CrygC), transcription factors (Tdrd7, FoxE3, Maf, Pitx 3) and profibrotic genes (Tgfβ, Bmp7, αSmA, vimentin) in surgically extracted cataract lens material were studied and correlated clinically.
Results:
In cataract material, the lens-related gene expression profiles were uniquely associated with phenotype/etiology of different cataracts. Postnatal cataracts showed a significantly altered FoxE3 expression. Low levels of Tdrd7 expression correlated with posterior subcapsular opacity, whereas CrygC correlated significantly with anterior capsular ruptures. The expression of Aqp0 and Maf was elevated in infectious cataracts, particularly in CMV infections, compared to other cataract subtypes. Tgfβ showed significantly low expression in various cataract subtypes, whereas vimentin had elevated gene expression in infectious and prenatal cataracts.
Conclusion:
A significant association between lens gene expression patterns in phenotypically and etiologically distinct subtypes of pediatric cataracts suggests regulatory mechanisms in cataractogenesis. The data reveal that cataract formation and presentation is a consequence of altered expression of a complex network of genes.
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