The relation between tryptophan metabolism and phototaxis in the tan3 mutant of Drosophila melanogaster
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概要
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1) The relationship between phototaxis and tryptophan metabolism was investigated with a mutant "tan3" of D. melanogaster.2) It has been found that "tan3" mutant flies, having little positive phototaxis, involve a little amounts of red and brown pigments in their eyes, as compared with those of wild type flies.3) The amount of brown pigment in "tan3" mutant was increased by feeding the larvae with kynurenine or 3-hydroxykynurenine, and its positive phototaxis was simultaneously activated. These phenomena, however, have never been recognized by feeding the larvae with tryptophan. From these results, it was assumed that "tan3" might be a mutant having a very low metabolic activity between tryptophan and kynurenine.4) The accumulation of cobalt was found in "tan3" eyes by feeding the larvae with kynurenine or 3-hydroxykynurenine, with an increase of brown pigment. This fact suggests that the cobalt-fuscanine named by Kikkawa and his coworkers may be produced in eye pigments and this metal containing pigment may take an important role in the activation of positive phototaxis.
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