Duplication And Expression Of Horizontally T.ransferred Polygalacturonase Genes Is A ssociated With Host Range Expansion Of Mirid Bugs
文献类型: 外文期刊
作者: Xu, PJ; Lu, B; Liu, JY; Chao, JT; Donkersley, P; Holdbrook, R; Lu, YH
作者机构:
关键词: Polygalacturonase; Gene duplication; Molecular evolution; Expression; Host range expansion
期刊名称: BMC EVOLUTIONARY BIOLOGY
ISSN: 1471-2148
年卷期: 2019 年 19 卷
页码:
收录情况: JCR(2021版)
摘要: BackgroudHorizontal gene transfer and gene duplication are two major mechanisms contributing to the evolutionary adaptation of organisms. Previously, polygalacturonase genes (PGs) were independently horizontally transferred and underwent multiple duplications in insects (e.g., mirid bugs and beetles). Here, we chose three phytozoophagous mirid bugs (Adelphocoris suturalis, A. fasciaticollis, A. lineolatus) and one zoophytophagous mirid bug (Nesidiocoris tenuis) to detect whether the duplication, molecular evolution, and expression levels of PGs were related to host range expansion in mirid bugs.ResultsBy RNA-seq, we reported 30, 20, 19 and 8 PGs in A. suturalis, A. fasciaticollis, A. lineolatus and N. tenuis, respectively. Interestingly, the number of PGs was significantly positive correlation to the number of host plants (P=0.0339) in mirid bugs. Most PGs (>17) were highly expressed in the three phytozoophagous mirid bugs, while only one PG was relatively highly expressed in the zoophytophagous mirid bug. Natural selection analysis clearly showed that a significant relaxation of selection pressure acted on the PGs in zoophytophagous mirid bugs (K=0.546, P=0.0158) rather than in phytozoophagous mirid bugs (K=1, P=0.92), suggesting a function constraint of PGs in phytozoophagous mirid bugs.ConclusionTaken together with gene duplication, molecular evolution, and expression levels, our results suggest that PGs are more strictly required by phytozoophagous than by zoophytophagous mirid bugs and that the duplication of PGs is associated with the expansion of host plant ranges in mirid bugs.
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