Molecular signatures of selection associated with host plant differences in Pieris butterflies

被引:12
|
作者
Okamura, Yu [1 ,2 ]
Sato, Ai [2 ]
Tsuzuki, Natsumi [2 ]
Murakami, Masashi [2 ]
Heidel-Fischer, Hanna [1 ,3 ]
Vogel, Heiko [1 ]
机构
[1] Max Planck Inst Chem Ecol, Dept Entomol, Hans Knoll Str 8, D-07745 Jena, Germany
[2] Chiba Univ, Fac Sci, Community Ecol Lab, Chiba, Japan
[3] HKI, Leibniz Inst Nat Prod Res & Infect Biol, Jena, Germany
基金
日本学术振兴会;
关键词
arms-race; host plant adaptation; insects; selection; POSITIVE SELECTION; ADAPTIVE RADIATION; KEY INNOVATIONS; GENE; DETOXIFICATION; GENERALIST; ADAPTATION; PHYLOGENY; DIVERSITY; ALGORITHM;
D O I
10.1111/mec.15268
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Adaptive traits that enable organisms to conquer novel niches and experience subsequent diversification are ecologically and evolutionarily important. The larvae of Pieris butterflies express nitrile-specifier proteins (NSPs), a key innovation for overcoming the glucosinolate (GLS)-myrosinase-based defence system of their Brassicales host plants. Nitrile-specifier proteins are a member of the NSP-like gene family, which includes the major allergen (MA) protein, a paralog of NSP with a GLS-disarming function, and a single domain major allergen (SDMA) protein, whose function is unknown. The arms-race between GLS-based defences and the NSP-like gene family is suggested to mediate diversification in both Pierid butterflies and Brassicales plants. Here, we tested whether the expected strong selection on NSP-like gene family correlates with shifts in host plant spectra among Pierid butterflies. We combined feeding experiments using 25 Brassicaceae plants and five Pieris species with larval transcriptome data to investigate the patterns of selection acting on NSP-like gene family members. Although we observed significantly elevated nonsynonymous to synonymous substitution rate ratios in NSPs on branches associated with changes in patterns of host plant usage, no such pattern was observed in MAs or SDMAs. Furthermore, we found evidence for positive selection of NSP at a phylogenetic branch which reflects different host plant spectra. Our data indicate that the NSP-related gene members have evolved differently: NSPs have accumulated more amino acid changes in response to shifting preferences for host plants, whereas MAs and SDMAs appear to be more conserved. Further detailed functional assays of these genes would provide important insights to understand their role in the chemical arms-race between Pieris butterflies and their Brassicales host plants.
引用
收藏
页码:4958 / 4970
页数:13
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