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Disease Retinal of Genetics• 7 chapter

response using appropriately designed GWAS performed on responder and nonresponder groups in clinical trials.

SUMMARY: THE FUTURE IS BRIGHT

The advance in our understanding of the molecular basis of retinal disease in the last two decades has been remarkable. From merely classifying disease using phenotypes, we are now aware of over 190 genes important in the pathogenesis of such disease and are moving ever closer to grasping the complexities of how these translate into phenotypes. This progress has been made possible by the collaboration of investigators from diverse disciplines: scientists with expertise in biophysics, molecular biology, and epidemiology as well as geneticists and ophthalmic clinicians who have all worked successfully together to provide answers to many of the questions surrounding inherited retinal disease. With the unprecedented flow of data emerging from GWAS and genome sequencing we will depend increasingly on the input of computer scientists and statisticians. The next 5 years are likely to be as exciting, if not more, so than the last 20, and it is ultimately the patients who should gain most from the long-awaited implementation of our discoveries into effective therapy.

Key points

•  Significant advances in our understanding of the genetics of retinal diseases have been made in recent years, aided by microarray chips, GWAS, and the advent of affordable sequencing.

•  Inherited retinal diseases of mendelian inheritance have been found to exhibit extreme genetic heterogeneity. Phenotypic variation displayed in pedigrees possessing identical mutations is not yet completely understood; possible mechanisms are modifier genes and environmental factors.

•  Diseases of complex inheritance such as AMD are now known to have a strong genetic component. Genetic studies were pivotal in the implication of inflammation and innate immunity, in particular the alternative complement pathway, in the pathogenesis of AMD. This knowledge has inspired the

development of therapies for AMD which target these pathways. •  Gene therapy is the most promising approach for the treatment

of inherited retinal dystrophies; recent successes in LCA pave the way for further clinical trials.

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Retina in Sciences Basic • 1 section

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