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Involvement of tryptophan metabolism in the body color of crustacea.
Adv Exp Med Biol
May 2000
Department of Biology, Keio University, Yokohama, Japan.
The terrestrial isopod, Armadillidium vulgare is usually grey or black in color, however, red ones are occasionally found in the field. This is caused by the mutation of the ommochrome genesis in the integument. We focused our experiments on the mechanism of pigment genesis in which tryptophan metabolism had been expected to be different from the grey or black wild types.
View Article and Find Full Text PDFOmmochrome genesis in an albino strain of a terrestrial isopod.
Adv Exp Med Biol
May 2000
Department of Biology, Keio University, Yokohama, Japan.
The contents of tryptophan (Trp) metabolites and the activities of the enzymes involved in ommochrome biosynthesis were measured in an albino strain of a terrestrial isopod Armadillidium vulgare. There was little difference between the Trp content in the albino mutant and that in the wild type, although the contents of 3-hydroxykynurenine (3-OH-Kyn), 3-hydroxyanthranilic acid (3-OH-AA) and xanthommatin in the albino were significantly lower than those in the wild type. Tryptophan 2,3-dioxygenase (TDO) activity in the albino was extremely low, while the activities of Kyn-3-hydroxylase and kynureninase did not differ significantly between the two phenotypes.
View Article and Find Full Text PDFGenetic and biochemical studies on ommochrome genesis in an albino strain of a terrestrial isopod, Armadillidium vulgare.
Pigment Cell Res
October 1997
Department of Biology, Keio University, Yokohama, Japan.
Genetic studies and quantitative determination of levels of 3-hydroxykynurenine and kynurenine were performed in an albino strain of a terrestrial isopod Armadillidium vulgare. From the results of matings between the albino and the albino, the red, the dark red, or the wild type individuals, the albino A. vulgare seems to be regulated by an autosomal gene(s) recessive to its wild allele.
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