Background:Age-related macular degeneration (AMD) is the main cause of blindness in the developed world. The etiology of AMD is multifactorial due to the interaction between genetic and environmental factors. IL-8 has a role in inflammation and angiogenesis; we report the genetic characterization of IL-8 allele architecture and evaluate the role of SNPs or haplotypes in the susceptibility to wet AMD, case-control study.Methods:Case-control study including 721 AMD patients and 660 controls becoming from Italian population. Genotyping was carried out by Real Time-PCR. Differences in the frequencies were estimated by the chi-square test. Direct sequencing was carried out by capillary electrophoresis trough ABI3130xl.Results:rs2227306 showed a p-value of 4.15*10-5 and an Odds Ratio (OR) for T allele of 1.39 [1.19-1.62]. After these positive results, we sequenced the entire IL-8 regulatory and coding regions of 60 patients and 30 controls stratified for their genotype at rs2227306. We defined two different haplotypes involving rs4073 (A/T), rs2227306 (C/T), rs2227346 (C/T) and rs1126647 (A/T): A-T-T-T (p-value: 2.08*10-9; OR: 1.68 [1.43-1.97]) and T-C-C-A (p-value: 7.07*10-11; OR: 0.60 [0.51-0.70]). To further investigate a potential functional role of associated haplotypes, we performed an expression study on RNA extracted from whole blood of 75 donors to verify a possible direct correlation between haplotype and gene expression, failing to reveal significant differences.Conclusions:These results suggest a possible secondary role of IL-8 gene in the development of the disease. This paper outlines the importance of association between inflammation and AMD. Moreover IL-8 is a new susceptibility genomic biomarker of AMD.

Haplotypes in IL-8 Gene Are Associated to Age-Related Macular Degeneration : A Case-Control Study / F. Ricci, G. Staurenghi, T. Lepre, F. Missiroli, S. Zampatti, R. Cascella, P. Borgiani, L.T. Marsella, C.M. Eandi, F. Viola, A. Cusumano, G. Novelli, E. Giardina. - In: PLOS ONE. - ISSN 1932-6203. - 8:6(2013 Jun 19), pp. e66978.1-e66978.5.

Haplotypes in IL-8 Gene Are Associated to Age-Related Macular Degeneration : A Case-Control Study

G. Staurenghi;F. Viola;
2013-06-19

Abstract

Background:Age-related macular degeneration (AMD) is the main cause of blindness in the developed world. The etiology of AMD is multifactorial due to the interaction between genetic and environmental factors. IL-8 has a role in inflammation and angiogenesis; we report the genetic characterization of IL-8 allele architecture and evaluate the role of SNPs or haplotypes in the susceptibility to wet AMD, case-control study.Methods:Case-control study including 721 AMD patients and 660 controls becoming from Italian population. Genotyping was carried out by Real Time-PCR. Differences in the frequencies were estimated by the chi-square test. Direct sequencing was carried out by capillary electrophoresis trough ABI3130xl.Results:rs2227306 showed a p-value of 4.15*10-5 and an Odds Ratio (OR) for T allele of 1.39 [1.19-1.62]. After these positive results, we sequenced the entire IL-8 regulatory and coding regions of 60 patients and 30 controls stratified for their genotype at rs2227306. We defined two different haplotypes involving rs4073 (A/T), rs2227306 (C/T), rs2227346 (C/T) and rs1126647 (A/T): A-T-T-T (p-value: 2.08*10-9; OR: 1.68 [1.43-1.97]) and T-C-C-A (p-value: 7.07*10-11; OR: 0.60 [0.51-0.70]). To further investigate a potential functional role of associated haplotypes, we performed an expression study on RNA extracted from whole blood of 75 donors to verify a possible direct correlation between haplotype and gene expression, failing to reveal significant differences.Conclusions:These results suggest a possible secondary role of IL-8 gene in the development of the disease. This paper outlines the importance of association between inflammation and AMD. Moreover IL-8 is a new susceptibility genomic biomarker of AMD.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/226843
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