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An allele of microtubule-associated protein 1A (Mtap1a) reduces photoreceptor degeneration in Tulp1 and Tub Mutant Mice.

Invest. Ophthalmol. Vis. Sci.2012 Mar 26;53(3):1663-9
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摘要


PURPOSE:To identify genes that modify photoreceptor cell loss in the retinas of homozygous Tulp1(tm1Pjn) and Tub(tub) mice, which exhibit juvenile retinitis pigmentosa. METHODS:Modifier loci were identified by genetic quantitative trait locus analysis. F2 Tulp1(tm1Pjn/tm1Pjn) mutant mice from a B6-Tulp1(tm1Pjn/tm1Pjn) × AKR/J intercross were genotyped with a panel of single nucleotide polymorphism markers and phenotyped by histology for photoreceptor nuclei remaining at 9 weeks of age. Genotype and phenotype data were correlated and examined with Pseudomarker 2.02 using 128 imputations to map modifier loci. Thresholds for the 63%, 10%, 5%, and 1% significance levels were obtained from 100 permutations. A significant, protective candidate modifier was identified by bioinformatic analysis and confirmed by crossing transgenic mice bearing a protective allele of this gene with Tulp1- and Tub-deficient mice. RESULTS:A significant, protective modifier locus on chromosome 2 and a suggestive locus on chromosome 13 that increases photoreceptor loss were identified in a B6-Tulp1(tm1Pjn/tm1Pjn) × AKR/J intercross. The chromosome 2 locus mapped near Mtap1a, which encodes a protein associated with microtubule-based intracellular transport and synapse function. The protective Mtap1a(129P2/OlaHsd) allele was shown to reduce photoreceptor loss in both Tulp1(tm1Pjn/tm1Pjn) and Tub(tub/tub) mice. CONCLUSIONS:It was demonstrated that the gene Mtap1a, which modifies hearing loss in Tub(tub/tub) mice, also modifies retinal degeneration in Tub(tub/tub) and Tulp1(tm1Pjn/tm1Pjn) mice. These results suggest that functionally nonredundant members of the TULP family (TUB and TULP1) share a common functional interaction with MTAP1A.

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