Distinct genetic risk profile of the rapidly progressing diffuse-trickling subtype of geographic atrophy in age-related macular degeneration (AMD)

Monika Fleckenstein, Felix Grassmann, Moritz Lindner, Maximilian Pfau, Joanna Czauderna, Tobias Strunz, Claudia von Strachwitz, Steffen Schmitz-Valckenberg, Frank G. Holz, Bernhard H.F. Weber*

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

PURPOSE. To genetically characterize a subphenotype of geographic atrophy (GA) in AMD associated with rapid progression and a diffuse-trickling appearance on fundus autofluorescence imaging. METHODS. Patients from the Fundus Autofluorescence in Age-Related Macular Degeneration Study were phenotyped for diffuse-trickling GA (dt-GA; n = 44). DNA was analyzed for 10 known AMD-associated genetic variants. A genetic risk score (GRS) was calculated and compared with patients with nondiffuse-trickling GA (ndt-GA; n = 311) and individuals from the 1000 genomes project (1000G; n = 267). Given the phenotypic overlap between diffusetrickling and late-onset retinal degeneration (LORD), all C1QTNF5 exons and their exon/ intron boundaries were sequenced. RESULTS. A statistically significant difference in allele frequencies between dt-GA and ndt-GA were found for CFH: rs1061170 and CFH: rs800292 (Pcorrected = 0.03). The ARMS2 variant rs10490924 was significantly more frequent in dt-GA than in 1000G individuals (Pcorrected < 0.01). The GRS of dt-GA patients was in-between the score of the 1000G individuals and that of patients with ndt-GA, significantly differing from both (Pcorrected <0.01). Sequencing of C1QTNF5 revealed 28 unique variants although none showed a statistically significant association with dt-GA when compared with 1000G individuals. CONCLUSIONS. The dt-GA phenotype shows a remarkably different genetic risk profile from other GA phenotypes secondary to AMD. Disease-associated C1QTNF5 mutations were not identified. Together, these results suggest that the dt-GA phenotype is associated with a genetic background substantially different from other GA phenotypes and underlines the necessity to refine the clinical phenotyping, specifically when aiming for individualized therapies in AMD.

Original languageEnglish
Pages (from-to)2463-2471
Number of pages9
JournalInvestigative Ophthalmology and Visual Science
Volume57
Issue number6
Early online date25 Mar 2016
DOIs
Publication statusPublished - May 2016

Keywords

  • AMD
  • C1QTNF5 gene
  • Diffuse-trickling phenotype
  • Fundus autofluorescence imaging
  • Genetic risk factors
  • Late-onset retinal degeneration

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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    Fleckenstein, M., Grassmann, F., Lindner, M., Pfau, M., Czauderna, J., Strunz, T., von Strachwitz, C., Schmitz-Valckenberg, S., Holz, F. G., & Weber, B. H. F. (2016). Distinct genetic risk profile of the rapidly progressing diffuse-trickling subtype of geographic atrophy in age-related macular degeneration (AMD). Investigative Ophthalmology and Visual Science, 57(6), 2463-2471. https://doi.org/10.1167/iovs.15-18593