Abstract
Previous studies in humans with a variety of inherited retinal degenerations have shown that they have reduced blood levels of docosahexaenoic acid (DHA, 22:6n-3) (ref. 1–10), the major fatty acid in photoreceptor rod outer segment (ROS) membranes11. The greatest differences are seen in people with x-linked retinitis pigmentosa7 and Usher’s syndrome type II (ref 10). Since the gene defect in these two types of inherited retinal degeneration is different, it is not likely that the reduction in blood levels of DHA is due directly to the mutation. Until recently, none of the mutations identified in retinitis pigmentosa were found in genes encoding proteins that are involved in lipid metabolism. However, Zhang et al12 found that two forms of macular degeneration (Stargardt-like macular dystrophy and autosomal dominant macular dystrophy) map to a 0.6 cM interval on chromosome 6ql4 that contains a new retinal photoreceptor-specific gene, ELOVL4, which has sequence homology to a yeast protein that functions in the synthesis of very long chain fatty acids (also see chapter in this book).
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Anderson, R.E., Sieving, P.A., Bush, R.A., Maude, M.B., Wu, TH., Naash, M.I. (2001). DHA Levels in Rod Outer Segments of Transgenic Mice Expressing G90D Rhodopsin Mutations. In: Anderson, R.E., LaVail, M.M., Hollyfield, J.G. (eds) New Insights Into Retinal Degenerative Diseases. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1355-1_26
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DOI: https://doi.org/10.1007/978-1-4615-1355-1_26
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