Intraspecific Variation of Transposable Elements Reveals Differences in the Evolutionary History of Fungal Phytopathogen Pathotypes.
Intraspecific Variation of Transposable Elements Reveals Differences in the Evolutionary History of Fungal Phytopathogen Pathotypes.
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DOI：
10.1093/gbe/evad206
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发表时间：
2023-12-01
影响因子：
3.3
通讯作者：
Krasileva, Ksenia, V
中科院分区：
文献类型：
--
作者：
Nakamoto, Anne A.;Joubert, Pierre M.;Krasileva, Ksenia, V
关键词：
转座元件（TE）有助于种内变异，并在真菌基因组的进化中发挥重要作用。然而，我们对塑造 TE 景观的过程的理解是有限的，我们对 TE 含量、种群结构和真菌物种进化历史之间关系的理解也是有限的。真菌植物病原体通常具有宿主特异性种群，是研究种内 TE 含量多样性的有用系统。在这里，我们描述了稻瘟病菌五个谱系的 TE 动态，稻瘟病菌是引起水稻、小麦和许多其他草类稻瘟病的真菌。我们确定了这些谱系之间 TE 含量的差异，并表明最近某些 TE 的谱系特异性扩展导致了水稻感染谱系和狗尾草感染谱系中总体 TE 含量的增加。我们重建了长末端重复逆转录转座子扩展的进化历史，发现在某些情况下，它们是由一种元素的复杂增殖动力学引起的，而在其他情况下是由来自较老的 TE 群体的多个元素并行繁殖引起的。此外，我们发现证据表明最近在感染水稻和小麦的米霉谱系之间发生了 DNA 转座子的转移，并且一个区域显示出这些谱系之间同源重组的证据，这可能促进了这种转移。通过研究种内 TE 含量变化，我们发现了真菌植物病原体的各种致病型中 TE 增殖动态的关键差异，使我们更好地了解病原体本身的进化历史。
Transposable elements (TEs) contribute to intraspecific variation and play important roles in the evolution of fungal genomes. However, our understanding of the processes that shape TE landscapes is limited, as is our understanding of the relationship between TE content, population structure, and evolutionary history of fungal species. Fungal plant pathogens, which often have host-specific populations, are useful systems in which to study intraspecific TE content diversity. Here, we describe TE dynamics in five lineages of Magnaporthe oryzae, the fungus that causes blast disease of rice, wheat, and many other grasses. We identified differences in TE content across these lineages and showed that recent lineage-specific expansions of certain TEs have contributed to overall greater TE content in rice-infecting and Setaria-infecting lineages. We reconstructed the evolutionary histories of long terminal repeat-retrotransposon expansions and found that in some cases they were caused by complex proliferation dynamics of one element and in others by multiple elements from an older population of TEs multiplying in parallel. Additionally, we found evidence suggesting the recent transfer of a DNA transposon between rice- and wheat-infecting M. oryzae lineages and a region showing evidence of homologous recombination between those lineages, which could have facilitated such a transfer. By investigating intraspecific TE content variation, we uncovered key differences in the proliferation dynamics of TEs in various pathotypes of a fungal plant pathogen, giving us a better understanding of the evolutionary history of the pathogen itself.
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