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      Multimodal imaging in familial dominant drusen

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      Indian Journal of Ophthalmology
      Wolters Kluwer - Medknow

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          Abstract

          A 42-year-old female came for routine checkup with 20/20 vision. Fundus examination revealed bilateral, numerous, yellowish-white, round, and closely spaced lesions extending from the vascular arcades till the periphery, sparing a small island of macula, suggestive of familial dominant drusen [Fig. 1a and b]. Fundus autofluorescence revealed bright hyperautofluorescence of the lesions [Fig. 1c and d]. Optical coherence tomography scans showed thickened retinal pigment epithelium-bruchs membrane complex with localized elevations [Fig. 1e and f]. The disease is caused by mutation in the EFEMP1 gene on short arm of chromosome 2, which encodes Fibulin-3, an extracellular matrix glycoprotein. Most patients are asymptomatic and retain good vision.[1 2 3] Figure 1 (a-e) Ultra widefield fundus photographs showing bilateral, numerous, yellowish-white, round, closely spaced lesions extending from the vascular arcades till the periphery, sparing a small island of the macula (a and b), Fundus autofluorescence revealed bright hyperautofluorescence of the lesions (c and d). Optical coherence tomography scans of both eyes showing thickening of RPE-Bruchs complex with dome shaped RPE elevations (red arrows) and relative noninvolvement of neurosensory retina corresponding to the drusen (e and f) Declaration of patient consent The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed. Financial support and sponsorship Nil. Conflicts of interest There are no conflicts of interest.

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          Most cited references3

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          A single EFEMP1 mutation associated with both Malattia Leventinese and Doyne honeycomb retinal dystrophy.

          Malattia Leventinese (ML) and Doyne honeycomb retinal dystrophy (DHRD) refer to two autosomal dominant diseases characterized by yellow-white deposits known as drusen that accumulate beneath the retinal pigment epithelium (RPE). Both loci were mapped to chromosome 2p16-21 (refs 5,6) and this genetic interval has been subsequently narrowed. The importance of these diseases is due in large part to their close phenotypic similarity to age-related macular degeneration (AMD), a disorder with a strong genetic component that accounts for approximately 50% of registered blindness in the Western world. Just as in ML and DHRD, the early hallmark of AMD is the presence of drusen. Here we use a combination of positional and candidate gene methods to identify a single non-conservative mutation (Arg345Trp) in the gene EFEMP1 (for EGF-containing fibrillin-like extracellular matrix protein 1) in all families studied. This change was not present in 477 control individuals or in 494 patients with age-related macular degeneration. Identification of this mutation may aid in the development of an animal model for drusen, as well as in the identification of other genes involved in human macular degeneration.
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            Assessment of the phenotypic range seen in Doyne honeycomb retinal dystrophy.

            Using molecular genetics as the basis for diagnosis, to assess the phenotype in the family originally described as having dominantly inherited Doyne honeycomb retinal dystrophy (DHRD) linked to chromosome 2p16.
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              Linkage of autosomal dominant radial drusen (malattia leventinese) to chromosome 2p16-21.

              To identify the chromosomal location of the gene involved in the pathogenesis of autosomal dominant radial drusen (malattia leventinese). Eighty-six members of four families affected with radial drusen; one family of American origin and three families of Swiss origin. Family members were clinically examined for the presence of radial drusen. Affected patients and potentially informative spouses were genotyped with short tandem repeat polymorphisms distributed across the autosomal genome. The clinical and genotypic data were subjected to linkage analysis. Fifty-six patients were found to be clinically affected. Significant linkage was observed between the disease phenotype and markers known to lie on the short arm of chromosome 2. The maximum two-point lod score (Zmax) observed for all four families combined was 10.5 and was obtained with marker D2S378. Multipoint analysis yielded a Zmax of 12, centered on marker D2S378. The lod-1 confidence interval was 8 cM, while the disease interval defined by observed recombinants was 14 cM. The gene responsible for autosomal dominant radial drusen has been mapped to the short arm of chromosome 2. This is an important step toward actually isolating the disease-causing gene. In addition, this information can be used to evaluate other familial drusen phenotypes such as Doyne's macular dystrophy for a possible allelic relationship.
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                Author and article information

                Journal
                Indian J Ophthalmol
                Indian J Ophthalmol
                IJO
                Indian Journal of Ophthalmology
                Wolters Kluwer - Medknow (India )
                0301-4738
                1998-3689
                October 2020
                : 68
                : 10
                : 2266
                Affiliations
                [1]Advanced Eye Centre, Department of Ophthalmology, Post Graduate Institute of Medical Education and Research, Chandigarh, Punjab, India
                Author notes
                Correspondence to: Dr. Reema Bansal, Room No. 116, Advanced Eye Center, PGIMER, Chandigarh - 160 012, India. E-mail: drreemab@ 123456rediffmail.com
                Article
                IJO-68-2266
                10.4103/ijo.IJO_233_20
                7727969
                32971684
                5b39f3f0-7dba-418e-aa15-a88639cb9d8e
                Copyright: © 2020 Indian Journal of Ophthalmology

                This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms.

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                Ophthalmic Images

                Ophthalmology & Optometry
                Ophthalmology & Optometry

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