PubMed · 13978689
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W R STAFFORD. 1963. Pseudopapilledema.. https://pubmed.ncbi.nlm.nih.gov/13978689/
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Eye diseases can be simple or complex, and mostly of heterogeneous molecular genetics. Some eye diseases are caused by mutations in a single gene, but some diseases, such as primary open angle glaucoma, can be due to sequence variations in multiple genes. In some diseases, both genetic and epigenetic mechanisms are involved, as was recently revealed in the mechanism of retinoblastoma. Disease causative mutations and phenotypes may vary by ethnicity and geography. To date, more than a hundred candidate genes for eye diseases are known, although less than 20 have definite disease-causing mutations. The three common genetic eye diseases, primary open angle glaucoma, age-related macular degeneration, and retinitis pigmentosa, all have known gene mutations, but these account for only a portion of the patients. While the search for eye disease genes and mutations still goes on, known mutations have been utilized for diagnosis. Genetic markers for pre-symptomatic and pre-natal diagnosis are available for specific diseases such as primary open angle glaucoma and retinoblastoma. This paper reviews the molecular basis of common genetic eye diseases and the available genetic markers for clinical diagnosis. Difficulties and challenges in molecular investigation of some eye diseases are discussed. Establishment of ethnic-specific disease databases that contain both clinical and genetic information for identification of genetic markers with diagnostic, prognostic, or pharmacological value is strongly advocated.
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The eye has always provided a diagnostic window for hereditary and acquired systemic diseases. Of the more than 6,000 known hereditary diseases, many are associated with changes of the visual system. Some are isolated genetic diseases of the eye, others are associated with additional ocular or systemic disorders (syndromes). In recent years, the recognition of genetic diseases as a leading cause of severe visual impairment in adults and in children has led to efforts to determine the underlying defects as well as to develop diagnostic and therapeutic molecular genetic tools. Also, education of ophthalmologists about these diseases will foster the prevention of and therapeutic approaches for genetic blindness. In this article, current knowledge on the clinical manifestations, aetiology and management of genetic diseases of the eye has been summarised.