Allopolyploids, which are formed from the hybridization of two or more diploid progenitor species, often experience subgenome dominance, where one of the parental genomes (subgenomes) has higher levels of gene expression and ultimately greater gene retention compared to the other subgenomes. Low transposable element (TE) abundance near genes has been associated with the dominant subgenome in several allopolyploids, but TEs are unlikely to be the only causal factor responsible for subgenome expression dominance. In this review, we will examine the role of TEs in subgenome dominance as well as discuss how genetic incompatibilities among subgenomes likely contributes to the rapid emergence of subgenome dominance. Lastly, we highlight several burning questions about subgenome dominance that remain largely unanswered.

中文翻译：

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一个亚基因组将它们全部统治：亚基因组优势的潜在机制。

由两个或多个二倍体祖先物种杂交形成的同素多倍体经常经历亚基因组优势，其中亲本基因组（亚基因组）之一的基因表达水平更高，最终比其他亚基因组的基因保留率更高。基因附近的低转座子（TE）丰度已与几种同素多倍体中的显性亚基因组相关联，但TEs不太可能是造成亚基因组表达优势的唯一原因。在这篇综述中，我们将研究TEs在亚基因组优势中的作用，并讨论亚基因组之间的遗传不相容性可能如何促进亚基因组优势的迅速出现。最后，我们重点介绍了有关亚基因组优势的几个亟待解决的问题，这些问题仍未得到解答。