数字农科院2.0

Identification Of Wild-Type Cyp321A2 And Comparison Of Allelochemical-Induced Expression Profiles Of Cyp321A2 With Its Paralog Cyp321A1 In Helicoverpa Zea

文献类型： 外文期刊

作者： Li; SY; Chen; S; Xie; XC; Dong; SL; Li; XC

关键词： Helicoverpa Zea; Resistance; Duplicate Genes; Allelochemical-Induced Expression

期刊名称： Insects

ISSN： 2075-4450

年卷期： 2021 年 12 卷 1 期

页码：

收录情况： JCR（2021版）

摘要： Simple Summary Plant toxin- and insecticide-detoxifying genes known as P450s are often involved in insect resistance to xenobiotics. For polyphagous generalists, investigation of ecologically significant P450s and their induced expression profiles by allelochemicals is of particular importance to understand the roles of these genes in detoxification of allelochemicals and insecticides, and the adaptation of generalists to their chemical environment. Previous studies identified an allelochemical-inducible P450 gene CYP321A1 in polyphagous Helicoverpa zea, which is associated with detoxification of its inducers including plant allelochemicals and insecticides. Our study represents the identification, features of CYP321A2 (a duplicated paralog of CYP321A1), as well as the responses of CYP321A paralogs to allelochemicals and plant signal molecules in H. zea. Moreover, xanthotoxin- and flavone-responsive regulatory elements of CYP321A1 were also detected in the promoter region of CYP321A2. Our results enrich the P450 inventory by identifying an allelochemical broadly induced CYP321A2 in H. zea. Our data also suggest that the CYP321A2/CYP321A1 paralogs are a pair of duplicated genes of multigene families and CYP321A2 has the potential to detoxify plant allelochemicals and adapt to its chemical environment. One possible way to overcome the diversity of toxic plant allelochemicals idiosyncratically distributed among potential host plants is to have more counterdefense genes via gene duplication or fewer gene losses. Cytochrome P450 is the most important gene family responsible for detoxification of the diversity of plant allelochemicals. We have recently reported the identification and cloning of the transposon (HzSINE1)-disrupted non-functional CYP321A2, a duplicated paralog of the xenobiotic-metabolizing P450 CYP321A1 from a laboratory colony of Helicoverpa zea. Here we report the identification of the wild-type intact allele of CYP321A2 from another H. zea colony. This CYP321A2 allele encodes a deduced protein of 498 amino acids and has the P450 signature motifs. Quantitative RT-PCR experiments showed that this CYP321A2 allele was highly expressed in midgut and fat body and achieved the highest expression level in the developmental stage of 5th and 3rd instar larvae. CYP321A2 and CYP321A1 were constitutively expressed in low levels but can be differentially and significantly induced by a range of the plant allelochemicals and plant signal molecules, among which xanthotoxin, flavone, and coumarin were the most prominent inducers of CYP321A2 both in midgut and fat body, whereas flavone, coumarin, and indole-3-carbinol were the prominent inducers of CYP321A1 in midgut and fat body. Moreover, xanthotoxin- and flavone-responsive regulatory elements of CYP321A1 were also detected in the promoter region of CYP321A2. Our results enrich the P450 inventory by identifying an allelochemical broadly induced CYP321A2, a paralog of CYP321A1 in H. zea. Our data also suggest that the CYP321A2/CYP321A1 paralogs are a pair of duplicated genes of multigene families and CYP321A2 could potentially be involved in the detoxification of plant allelochemicals and adaptation of H. zea to its chemical environment.

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