alexa The involvement of sequence variation and expression of CX3CR1 in the pathogenesis of age-related macular degeneration
Ophthalmology

Ophthalmology

Journal of Clinical & Experimental Ophthalmology

Author(s): Tuo J, Smith BC, Bojanowski CM, Meleth AD, Gery I

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This study examined the association between the sequence variation/expression of CX3CR1, a chemokine receptor, and age-related macular degeneration (AMD). Peripheral blood from 85 AMD patients and 105 subjects without AMD (controls), as well as ocular tissue from 40 pathological sections with AMD and two normal eye sections, were screened for V249I and T280M, two single nucleotide polymorphisms (SNPs) in CX3CR1. An increased prevalence, with the highest odds ratio of 3.57, of the I249 and M280 carriers was found among the AMD cases as compared with the controls. When comparing CX3CR1 expression in the archived eye sections, CX3CR1 transcripts were not detectable in the maculae of AMD eyes bearing T/M280; however, transcripts were detected in the maculae of normal eyes bearing T/T280 or T/M280 as well as in the AMD maculae bearing T/T280. Furthermore, lower CX3CR1 protein expression was observed in the maculae of AMD eyes bearing T/M280 compared with the controls bearing T/T280. The I249 and M280 alleles result in a lowered number of receptor binding sites and a decreased ligand affinity. Our data suggest that a decrease, caused by sequence variation and/or lower CX3CR1 expression, in CX3CR1-induced cellular activities could contribute to AMD development.

This article was published in The FASEB Journal and referenced in Journal of Clinical & Experimental Ophthalmology

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