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Variation in complement component C1 inhibitor in age-related macular degeneration
J Gibson1, S Hakobyan, A J Cree
1Genetic Epidemiology & Bioinformatics Group, Human Genetics Division, School of Medicine, University of Southampton, Southampton General Hospital, Southampton, UK.
Immunobiology
|August 20, 2011
Summary
Plasma C1 inhibitor levels are significantly different in age-related macular degeneration (AMD) patients compared to controls. Genetic variations near the SERPING1 gene influence C1 inhibitor levels, suggesting a role in AMD pathogenesis.
Area of Science:
- Ophthalmology
- Immunology
- Genetics
Background:
- Age-related macular degeneration (AMD) is a leading cause of vision loss.
- The complement system, particularly C1 inhibitor (C1inh), plays a role in inflammatory processes.
- Understanding factors influencing C1inh levels may provide insights into AMD.
Purpose of the Study:
- To investigate plasma C1 inhibitor (C1inh) levels in patients with age-related macular degeneration (AMD) and healthy controls.
- To explore associations between C1inh levels and AMD, demographic factors, and genetic variations in the SERPING1 gene.
Main Methods:
- Plasma C1inh protein levels were measured using rate nephelometry in 391 AMD cases and 370 controls.
- Multivariate analysis was employed to assess relationships between C1inh levels and age, gender, smoking status, AMD status, and SERPING1 gene variants.
- Single nucleotide polymorphism (SNP) rs2649663 near the SERPING1 gene was analyzed for its association with C1inh levels.
Main Results:
- Significantly higher C1inh levels were observed in AMD cases compared to controls (p=2.340E-6).
- C1inh levels were also significantly associated with smoking status (p=1.022E-4) and gender (p=1.661E-7).
- AMD status remained a significant factor after adjusting for gender and smoking. A SNP (rs2649663) 5' of SERPING1 was associated with C1inh levels but not AMD.
Conclusions:
- Plasma C1inh levels are significantly elevated in individuals with AMD.
- Genetic variations in the promoter region of the SERPING1 gene may influence C1inh expression and potentially contribute to AMD development.
- Further research is warranted to elucidate the precise role of C1inh in AMD pathogenesis.
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