Sawfly Genomes Reveal Evolutionary Acquisitions That Fostered the Mega-Radiation of Parasitoid and Eusocial Hymenoptera
Sawfly Genomes Reveal Evolutionary Acquisitions That Fostered the Mega-Radiation of Parasitoid and Eusocial Hymenoptera
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DOI：
10.1093/gbe/evaa106
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发表时间：
2020-07-01
影响因子：
3.3
通讯作者：
Niehuis, Oliver
中科院分区：
文献类型：
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作者：
Oeyen, Jan Philip;Baa-Puyoulet, Patrice;Niehuis, Oliver
蜂翅目的巨大多样性通常归因于寄生性叶蜂（Orussidae）和蜂腰蜂翅目（Apocrita）的最后共同祖先中寄生虫的进化。然而，Apocrita和Orussidae在物种丰富度上存在显着差异，表明Apocrita的多样性是由额外的特征促进的。这些特征仍然难以捉摸，由于缺乏叶蜂基因组序列，特别是那些寄生叶蜂。在这里，我们提出了比较分析草案基因组的主要植食性叶蜂Athalia rosae和寄生性叶蜂Orussus abietinus。我们的分析显示，祖先的hyperteran基因组表现出以前被认为是真社会性Apocrita独有的特征（例如，低转座因子含量和活性）和比以前认为的更宽的基因库（例如，用于CO2检测的基因）。此外，我们发现，Apocrita进化出一个显着更大的阵列的气味受体比叶蜂，这可能是相关的显着多样化的Apocrita，使有效的检测和可靠的识别主机。
The tremendous diversity of Hymenoptera is commonly attributed to the evolution of parasitoidism in the last common ancestor of parasitoid sawflies (Orussidae) and wasp-waisted Hymenoptera (Apocrita). However, Apocrita and Orussidae differ dramatically in their species richness, indicating that the diversification of Apocrita was promoted by additional traits. These traits have remained elusive due to a paucity of sawfly genome sequences, in particular those of parasitoid sawflies. Here, we present comparative analyses of draft genomes of the primarily phytophagous sawfly Athalia rosae and the parasitoid sawfly Orussus abietinus. Our analyses revealed that the ancestral hymenopteran genome exhibited traits that were previously considered unique to eusocial Apocrita (e.g., low transposable element content and activity) and a wider gene repertoire than previously thought (e.g., genes for CO2 detection). Moreover, we discovered that Apocrita evolved a significantly larger array of odorant receptors than sawflies, which could be relevant to the remarkable diversification of Apocrita by enabling efficient detection and reliable identification of hosts.