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Severe retinal dege...
Severe retinal degeneration at an early age in Usher syndrome type 1B associated with homozygous splice site mutations in MYO7A gene
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- Abdelkader, Ehab (author)
- King Khaled Eye Specialist Hospital,Menoufia University
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- Enani, Lama (author)
- King Khaled Eye Specialist Hospital
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- Schatz, Patrik (author)
- Lund University,Lunds universitet,Oftalmologi, Lund,Sektion IV,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Ophthalmology, Lund,Section IV,Department of Clinical Sciences, Lund,Faculty of Medicine,King Khaled Eye Specialist Hospital
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- Safieh, Leen (author)
- King Khaled Eye Specialist Hospital
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(creator_code:org_t)
- Medknow, 2018
- 2018
- English 7 s.
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In: Saudi Journal of Ophthalmology. - : Medknow. - 1319-4534. ; 32:2, s. 119-125
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Abstract
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- Purpose: Usher syndrome is the most common cause of deafness associated with visual loss of a genetic origin. The purpose of this paper is to report very severe phenotypic features of type 1B Usher syndrome in a Saudi family affected by positive homozygous splice site mutation in MYO7A gene. Methods: Affected siblings went through detailed history. Complete ophthalmic examination was done. Imaging with colour fundus photography, fundus autofluorescence (AF), and optical coherence tomography (OCT) scans was performed. Full field electroretinogram (ffERG) was recorded. Molecular genetic testing was done using next-generation sequencing. Results: Visual acuity was more reduced (range 20/300–20/40) in older siblings (age>30 years), than in younger (age <30 years) siblings (range 20/70–20/25). OCT scans showed macular atrophy in all but one case that has cystoid macular edema (CME). AF demonstrated atrophy outside a small foveal area showing high signal. FfERG was flat in all cases. The homozygous splice site mutation c.470+1G>A in intron 5 of the MYO7A gene was detected in all affected siblings. Conclusions: This mutation manifested with advanced retinal degeneration at a young age. This may have implications regarding future gene therapy in Usher syndrome cases with this genotype.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Oftalmologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Ophthalmology (hsv//eng)
Keyword
- Electroretinogram
- Fundus autofluorescence
- MYO7A mutation
- Retinitis pigmentosa
- Usher syndrome
Publication and Content Type
- art (subject category)
- ref (subject category)
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