title: Role of ELOVL4 and very long-chain polyunsaturated fatty acids in mouse models of Stargardt type 3 retinal degeneration.
abstract: Stargardt type 3 (STGD3) disease is a juvenile macular dystrophy caused by mutations in the ELOVL4 (Elongation of very long chain fatty acids 4) gene. Its protein product, ELOVL4, is an elongase required for the biosynthesis of very long-chain polyunsaturated fatty acids (VLC-PUFAs). It is unclear whether photoreceptor degeneration in STGD3 is caused by loss of VLC-PUFAs or by mutated ELOVL4 protein trafficking/aggregation. We therefore generated conditional knockout (cKO) mice with Elovl4 ablated in rods or cones and compared their phenotypes to transgenic (TG) animals that express the human STGD3-causing ELOVL4(STGD3) allele. Gas chromatography-mass spectrometry was used to assess C30-C34 VLC-PUFA and N-retinylidene-N-retinylethanolamine content; electroretinography was used to measure phototransduction and outer retinal function; electron microscopy was used for retinal ultrastructure; and the optomotor tracking response was used to test scotopic and photopic visual performance. Elovl4 transcription and biosynthesis of C30-C34 VLC-PUFAs in rod cKO and TG retinas were reduced up to 98%, whereas the content of docosahexaenoic acid was diminished in TG, but not rod cKO, retinas. Despite the near-total loss of the retinal VLC-PUFA content, rod and cone cKO animals exhibited no electrophysiological or behavioral deficits, whereas the typical rod-cone dystrophic pattern was observed in TG animals. Our data suggest that photoreceptor-specific VLC-PUFA depletion is not sufficient to induce the STGD3 phenotype, because depletion alone had little effect on photoreceptor survival, phototransduction, synaptic transmission, and visual behavior.
authors.affiliation: Department of Ophthalmology and Visual Sciences, Moran Eye Institute, University of Utah, Salt Lake City, UT 84132, USA. peter.barabas@utah.edu
authors.forename: Peter
authors.initials: P
authors.lastname: Barabas
authors.forename: Aihua
authors.initials: A
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Xing
authors.forename: Ching-Kang
authors.initials: CK
authors.lastname: Chen
authors.forename: Zongzhong
authors.initials: Z
authors.lastname: Tong
authors.forename: Carl B
authors.initials: CB
authors.lastname: Watt
authors.forename: Bryan W
authors.initials: BW
authors.lastname: Jones
authors.forename: Paul S
authors.initials: PS
authors.lastname: Bernstein
authors.forename: David
authors.initials: D
authors.lastname: Križaj
mesh_terms: D000818:Animals; D002470:Cell Survival / Q000235:genetics; D004195:Disease Models, Animal; D005136:Eye Proteins / Q000235:genetics / Q000378:metabolism*; D005231:Fatty Acids, Unsaturated / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008268:Macular Degeneration / Q000151:congenital* / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D009154:Mutation; D020419:Photoreceptor Cells, Vertebrate / Q000378:metabolism* / Q000473:pathology; D012160:Retina / Q000378:metabolism* / Q000473:pathology; D009435:Synaptic Transmission; D014785:Vision, Ocular
chemical_list: C498834:Elovl4 protein, mouse; D005136:Eye Proteins; D005231:Fatty Acids, Unsaturated; D008565:Membrane Proteins