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- W2238016187 abstract "<h3>Importance</h3> Rare variants in the complement genes<i>CFH</i>,<i>CFI</i>,<i>C9</i>, and<i>C3</i>have been found to be highly associated with age-related macular degeneration (AMD); however, the effect on clinical characteristics and familial segregation by these variants is lacking. <h3>Objectives</h3> To determine the contribution of rare<i>CFH</i>Arg1210Cys,<i>CFI</i>Gly119Arg,<i>C9</i>Pro167Ser, and<i>C3</i>Lys155Gln variants in the development of AMD in 22 multiplex families and to describe clinical differences in carriers vs noncarriers in these families and a large case-control cohort. <h3>Design, Setting, and Participants</h3> This retrospective case-control study included 114 affected and 60 unaffected members of 22 multiplex families with AMD as well as 1589 unrelated patients with AMD and 1386 unrelated control individuals enrolled in the European Genetic Database (EUGENDA). Patients were recruited from March 29, 2006, to April 26, 2013, and data were collected from April 20, 2012, to May 7, 2014. All participants underwent an extensive ophthalmic examination and completed a questionnaire. Venous blood samples were obtained from all participants for genetic analysis, including whole-exome sequencing and measurements of complement activation. Data were analyzed from September 23, 2014, to November 4, 2015. <h3>Main Outcomes and Measures</h3> Differences between carriers and noncarriers of rare variants in age at onset of symptoms, the family history of AMD, complement activation levels (C3d:C3 ratio), the presence of reticular pseudodrusen, and AMD phenotype. <h3>Results</h3> Among the 114 affected and 60 unaffected members of 22 multiplex families with AMD and the 1598 unrelated patients with AMD and 1386 controls in the EUGENDA cohort who underwent analysis, the presence of the<i>CFI</i>Gly119Arg,<i>C9</i>Pro167Ser, or<i>C3</i>Lys155Gln variant was confirmed in 18 individuals in 5 families but did not completely segregate with the disease. In the case-control cohort, the 91 affected carriers of these variants were younger at symptom onset (mean [SD] age, 67.4 [8.5] vs 71.3 [8.9] years;<i>P</i> = .01) and more often reported a positive family history (35 of 79 [44.3%] vs 367 of 1201 [30.6%];<i>P</i> = .008) compared with the 1498 noncarriers. Patients with advanced atrophic AMD carried these rare variants more frequently than patients with neovascular AMD (11 of 93 [11.8%] vs 40 of 835 [4.8%];<i>P</i> = .04). <h3>Conclusions and Relevance</h3> Previously reported rare variants do not completely segregate within families with AMD. However, patients carrying these rare variants differ clinically from noncarriers by an earlier age at symptom onset, higher prevalence of a positive family history, and AMD phenotype. These results suggest that genetic tests for AMD might be designed to detect common and rare genetic variants, especially in families, because rare variants contribute to the age at onset and progression of the disease." @default.
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- W2238016187 date "2016-03-01" @default.
- W2238016187 modified "2023-10-16" @default.
- W2238016187 title "Rare Genetic Variants Associated With Development of Age-Related Macular Degeneration" @default.
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- W2238016187 doi "https://doi.org/10.1001/jamaophthalmol.2015.5592" @default.
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