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Comparative Analysis of Transcriptomes among Bombyx mori Strains and Sexes Reveals the Genes Regulating Melanic Morph and the Related Phenotypes

Songzhen He  Xiaoling Tong  Kunpeng Lu  Yaru Lu  Jiangwen Luo  Wenhao Yang  Min Chen  Min-jin Han  Hai Hu  Cheng Lu  Fangyin Dai  
【摘要】:As a source of insect polymorphism,melanism plays an important role in ecological adaption and usually endows advantageous phenotypic-effects on insects.However,due to the mechanistic diversity,there are knowledge gaps in the molecular mechanisms underlying melanism and the related phenotypes.In silk moths,a recessive melanic mutant(sex-controlled melanism,sml) strain exhibits extended adult longevity.We took a transcriptome approach to perform a comparative analysis between this sml strain and a wild-type strain(Dazao).Our analysis resulted in the identification of 59 unique differentially expressed genes in the melanic mutant.Two key genes(laccase2 and yellow) involved in melanin formation were significantly up-regulated in melanic individuals.The laccase2 B-type isoform(BGIBMGA006746) was found to likely participate in the silkworm cuticular melanism process at late pupal stage.Moreover,we discovered 22 cuticular protein encoding genes with the possible function in melanin transport and/or maintenance.Based on our findings,we presume that the longer survival of the melanic sml male moths might be associated with the enhanced antioxidant defense systems and a reduction in the insulin/IGF-1 signaling pathway(IIS).These findings will facilitate the understanding of the molecular basis underlying melanism and the derived phenotypic-effects.

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