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Vidyullatha Vasireddy, Monica M. Jablonski, Md Nawajes A. Mandal, Dorit Raz-Prag, Xiaofei F. Wang, Lesli Nizol, Alessandro Iannaccone, David C. Musch, Ronald A. Bush, Norman Salem, Paul A. Sieving, Radha Ayyagari; Elovl4 5-bp–Deletion Knock-in Mice Develop Progressive Photoreceptor Degeneration. Invest. Ophthalmol. Vis. Sci. 2006;47(10):4558-4568. doi: 10.1167/iovs.06-0353.
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purpose. To develop and characterize a heterozygous knock-in mouse model carrying the 5-bp deletion in Elovl4 (E_mut +/−) and to study the pathology underlying Stargardt-like macular degeneration (STGD3).
methods. E_mut +/− mice were generated by targeting a 5-bp deletion (AACTT) in the Elovl4 gene by homologous recombination. E_mut +/− mice of age 2 to 18 months and age-matched wild-type (Wt) littermate control animals were analyzed for the expression of Elovl4 transcript, ELOVL4 protein, photoreceptor-specific genes, and retinal fatty acid composition. Functional retinal changes were evaluated by electroretinography (ERG) and by morphologic and ultrastructural criteria.
results. E_mut +/− mice retinas showed the presence of both Wt and mutant Elovl4 transcripts and proteins. Morphologic evaluation revealed cone photoreceptor ultrastructural abnormalities as early as 2 months of age, accumulation of lipofuscin in retinal pigment epithelium (RPE), and subretinal deposits at later ages. Shortening of rod outer segments (OS) was observed at ∼10 months of age. Both cone and rod changes progressed with age. Unlike rod-specific genes, expression of selected cone specific genes was significantly reduced by 7 months of age. Mixed rod–cone and light-adapted b-waves were higher than normal at both 8 and 15 months. Levels of the fatty acids 20:5 (P = 0.027), 22:5 (P = 0.040) and 24:6 (P = 0.005) were found to be significantly lower in the retinas of E_mut +/− mice than in retinas of control subjects.
conclusions. E_mut +/− animals display characteristic features associated with Stargardt-like macular degeneration and serve as a model for the study of the mechanism underlying STGD3.
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