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首页> 外文期刊>American Fern Journal >Expression Level Dominance and Homeolog Expression Bias in Recurrent Origins of the Allopolyploid Fern Polypodium hesperium
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Expression Level Dominance and Homeolog Expression Bias in Recurrent Origins of the Allopolyploid Fern Polypodium hesperium

机译：异源多倍体蕨类植物Pospodium hesperium的复发起源中的表达水平优势和同源表达偏见

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摘要

Allopolyploidization is a common mode of speciation in ferns with many taxa having formed recurrently from distinct hybridization events between the same parent species. Each hybridization event marks the union of divergent parental gene copies, or homeologs, and the formation of an independently derived lineage. Little is known about the effects of recurrent origins on the genomic composition and phenotypic variation of allopolyploid fern taxa. To begin to address this knowledge gap, we investigated gene expression patterns in two naturally formed, independently derived lineages of the allotetraploid fern Polypodium hesperium relative to its diploid progenitor species, Polypodium amorphum and Polypodium glycyrrhiza. Using RNA-sequencing to survey total gene expression levels for 19194 genes and homeolog-specific expression for 1073 genes, we found that, in general, gene expression in both lineages of P. hesperium was biased toward P. amorphum-both by mirroring expression levels of P. amorphum and preferentially expressing homeologs derived from P. amorphum. However, we recovered substantial expression variation between the two lineages at the level of individual genes and among individual specimens. Our results align with similar transcriptome profile studies of angiosperms, suggesting that expression in many allopolyploid plants reflects the dominance of a specific parental subgenome, but that recurrent origins impart substantial expression, or phenotypic, variation to allopolyploid taxa.
机译：同种多倍体化是蕨类植物中一种常见的物种形成方式，其中许多类群是由同一亲本物种之间独特的杂交事件反复形成的。每个杂交事件都标志着不同的亲本基因拷贝或同源物的结合，以及独立衍生的谱系的形成。关于复发起源对异源多倍体蕨类群的基因组组成和表型变异的影响知之甚少。为了解决这一知识鸿沟，我们调查了异源四倍体蕨类植物Pospopodium hesperium相对于其二倍体祖先种类，无定形and和甘草Poly的两个自然形成的，独立衍生的谱系的基因表达模式。使用RNA测序来调查19194个基因的总基因表达水平和1073个基因的同源同源物特异性表达，我们发现，一般来说，两个菊苣的谱系中的基因表达都通过镜像表达水平而偏向于紫穗槐。紫茎泽兰并优先表达源自紫茎泽兰的同源基因。但是，我们恢复了两个谱系在单个基因水平和单个标本之间的大量表达差异。我们的结果与类似的被子植物转录组谱研究相吻合，表明在许多异源多倍体植物中的表达反映了特定亲本亚基因组的优势，但复发起源赋予异源多倍体分类群实质性表达或表型变异。

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