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evaluation of patients with hereditary retinal diseases featuring subretinal spots, i.e. retinitis punctata albescens and fundus albipunctatus, and patients with typical dominant or recessive retinitis pigmentosa for mutations in RDH5. Mutations are found only in two unrelated patients, both with fundus albipunctatus. Mutations segregate with disease in the respective families. Recombinant mutant 11-cis retinol dehydrogenases have reduced activity compared with recombinant enzyme with wild-type sequence
examination of two unrelated families, each family with two affected members with typical fundus albipunctatus. RDH5 mutations were found in the affected siblings in both families. The proband in one has a homozygotic Gly238Trp missense mutation (GGG to TGG) involving exon 4 and in the other carries compound heterozygotic changes Arg280His (CGC to CAC) and Ala294Pro (GCC to CCC) in exon 5. The disease phenotype is only manifested in family members with two abnormal RDH5 alleles consistent with autosomal recessive inheritance in both pedigrees
mutations in gene RDH5 are associated with fundus albipunctatus, an autosomal recessive eye disease. Characterization of 11 mutants shows that all RDH5 mutants show decreased protein stability and subcellular mislocalization and, in most cases, loss of enzymatic activity in vitro and in vivo. The mutated enzymes, in a transdominant-negative manner, influence the in vivo enzymatic properties of functional variants of the enzyme. Under certain conditions, nonfunctional alleles act in a dominant-negative way on functional but relatively unstable mutated alleles. In heterozygous individuals carrying one wild-type allele, the disease is recessive, probably due to the stability of the wild-type enzyme
Results 1 - 3 of 3