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首页> 外文期刊>Pigment cell research >Pigment pattern formation in the quail mutant of the silkworm, Bombyx mori: parallel increase of pteridine biosynthesis and pigmentation of melanin and ommochromes
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Pigment pattern formation in the quail mutant of the silkworm, Bombyx mori: parallel increase of pteridine biosynthesis and pigmentation of melanin and ommochromes

机译：家蚕鹌鹑突变体中色素图案的形成：蝶啶生物合成的平行增加以及黑色素和全色素的色素沉着

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摘要

The larval pigment pattern in the silkworm, Bombyx mori, is formed by melanin, ommochromes and pteridines. During development all these pigments are synthesized autonomously, and possibly also with mutual interaction between them, to yield unique pigment patterns. In order to find the key trigger for such pigment pattern formation, developmental changes in pteridine biosynthesis were studied using the quail mutant (q/q), which has darker larval marks formed by melanin and an abundance of ommochromes in the integument. In the current study, emphasis has been placed on the analysis of GTP-cyclohydrolase I (GTP-CH I), which is a key enzyme for the biosynthesis of pteridines, during the development of the silkworm. Results of Northern blotting showed that in the quail mutant strong signals of GTP-CH I mRNA appeared around each period of ecdysis, while no such signals appeared in the background strain (+q/q) used. Also, both GTP-CH I activities and pteridine content were higher in the quail mutant compared with the background strain. These results strongly suggest that pteridine biosynthesis is closely linked to the formation of melanin and ommochromes. It is also suggested here that in the silkworm a recessive gene (q) may be involved in the regulation of its pigment pattern formation.
机译：家蚕中的幼虫色素图案是由黑色素，全色素和蝶啶形成的。在开发过程中，所有这些颜料都是自动合成的，而且可能还会在它们之间相互相互作用，以生成独特的颜料图案。为了找到形成这种色素图案的关键诱因，使用鹌鹑突变体（q / q）研究了蝶啶生物合成的发育变化，该突变体具有由黑色素形成的较深幼虫标记，并且在被膜中有丰富的全色素。在当前的研究中，重点放在了GTP-环水解酶I（GTP-CH I）的分析上，GTP-CHI是家蚕发育过程中蝶啶生物合成的关键酶。 Northern印迹的结果表明，在鹌鹑突变体中，GTP-CH I mRNA的强信号出现在蜕皮的每个周期周围，而在所使用的背景菌株（+ q / q）中没有出现这种信号。此外，鹌鹑突变体中的GTP-CH I活性和蝶啶含量均高于背景菌株。这些结果强烈表明，蝶啶的生物合成与黑色素和全色素的形成密切相关。在此还建议在家蚕中，隐性基因（q）可能参与其色素图案形成的调控。

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