Outer Retinal Changes Including the Ellipsoid Zone Band in Usher Syndrome 1B due to MYO7A Mutations
| Autor: | Rebecca Sheplock, Samuel G. Jacobson, Rodrigo Matsui, David B. McGuigan, Sharon B. Schwartz, Alexander Sumaroka, Artur V. Cideciyan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Adult Male Fovea Centralis genetic structures Retinal Photoreceptor Cell Outer Segment Adolescent DNA Mutational Analysis Visual Acuity Myosins 03 medical and health sciences chemistry.chemical_compound Young Adult 0302 clinical medicine Nuclear magnetic resonance medicine Electroretinography Humans Vision test Outer nuclear layer Child Physics Retina medicine.diagnostic_test Fovea centralis Retinal DNA Middle Aged Ellipsoid eye diseases 030104 developmental biology medicine.anatomical_structure chemistry Child Preschool Myosin VIIa Mutation 030221 ophthalmology & optometry Visual Field Tests Female sense organs Visual Fields Usher Syndromes Tomography Optical Coherence |
| Zdroj: | Investigative ophthalmologyvisual science. 57(9) |
| ISSN: | 1552-5783 |
| Popis: | PURPOSE To study transition zones from normal to abnormal retina in Usher syndrome IB (USH1B) caused by myosin 7A (MYO7A) mutations. METHODS Optical coherence tomography (OCT) scattering layers in outer retina were segmented in patients (n = 16, ages 2-42; eight patients had serial data, average interval 4.5 years) to quantify outer nuclear layer (ONL) and outer segments (OS) as well as the locus of EZ (ellipsoid zone) edge and its extent from the fovea. Static perimetry was measured under dark-adapted (DA) and light-adapted (LA) conditions. RESULTS Ellipsoid zone edge in USH1B-MYO7A could be located up to 23° from the fovea. Ellipsoid zone extent constricted at a rate of 0.51°/year with slower rates at smaller eccentricities. A well-defined EZ line could be associated with normal or abnormal ONL and/or OS thickness; detectable ONL extended well beyond EZ edge. At the EZ edge, the local slope of LA sensitivity loss was 2.6 (±1.7) dB/deg for central transition zones. At greater eccentricities, the local slope of cone sensitivity loss was shallower (1.1 ± 0.4 dB/deg for LA) than that of rod sensitivity loss (2.8 ± 1.2 dB/deg for DA). CONCLUSIONS In USH1B-MYO7A, constriction rate of EZ extent depends on the initial eccentricity of the transition. Ellipsoid zone edges in the macula correspond to large local changes in cone vision, but extramacular EZ edges show more pronounced losses on rod-based vision tests. It is advisable to use not only the EZ line but also other structural and functional parameters for estimating natural history of disease and possible therapeutic effects in future clinical trials of USH1B-MYO7A. |
| Databáze: | OpenAIRE |
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