| Clinical features of the retinopathy, globe enlarged (rge) chick phenotype. | |
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MedLine Citation:
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PMID: 12842154 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of the study reported here was to characterize the clinical aspects of the autosomal recessive retinopathy, globe enlarged (rge) phenotype in chicks (Gallus gallus). Rge/rge, rge/+ and +/+ chicks were studied from hatch to 336 days of age by general clinical examination, post-mortem examination, vision testing with an optokinetic device, ophthalmoscopy, biomicroscopy, tonometry, central corneal pachymetry, a-mode ultrasonography, infrared photoretinoscopy and photokeratometry. Additionally, preliminary electroretinographic and histopathologic investigations were performed. There is a variable degree of vision loss in rge/rge chicks at 1 day of age with further chicks losing vision over the next few weeks until all chicks become functionally blind by 30 days of age (although some optokinetic responses remain in some of the rge/rge chicks). Over the first few weeks of life rge/rge chicks develop thicker corneas with a larger radius, hyperopia, shallower anterior chambers and enlarged globes both radially and axially, compared to controls. A preliminary ERG study showed that 1 day old rge/rge chicks have an elevated response threshold, a lower amplitude a-wave with a markedly shallow leading slope, a lack of both oscillatory responses and c-waves and, at brighter flashes, an increased b-wave amplitude. Light microscopy revealed no gross retinal abnormalities in young chicks to account for the blindness. A thinning of all retinal layers developed in parallel with globe enlargement. The rge defect is a unique progressive retinal dystrophy that results in a severe visual deficit, abnormal electroretinographic waveforms, and secondary globe enlargement. |
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Authors:
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Fabiano Montiani-Ferreira; Tong Li; Matti Kiupel; Howard Howland; Paul Hocking; Roger Curtis; Simon Petersen-Jones |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Vision research Volume: 43 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 2003 Sep |
Date Detail:
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Created Date: 2003-07-04 Completed Date: 2003-08-26 Revised Date: 2003-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0417402 Medline TA: Vision Res Country: England |
Other Details:
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Languages: eng Pagination: 2009-18 Citation Subset: IM |
Affiliation:
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Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA. ferreir9@cvm.msu.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Animals Chick Embryo Electroretinography / methods Retinal Degeneration / etiology* Retinal Diseases / etiology* Visual Acuity |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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