The classical example of nonadditive contributions of the two parents to allopolyploids is nucleolar dominance, which entails silencing of one parental set of ribosomal RNA genes. This has been observed for many other loci. The prevailing explanation for this genome-wide expression disparity is that the two merged genomes differ in their transposable element (TE) complement and in their level of TE-mediated repression of gene expression. Alternatively, and not exclusively, gene expression dominance may arise from mismatches between trans effectors and their targets. Here, we explore quantitative models of regulatory mismatches leading to gene expression dominance. We also suggest that, when pairs of merged genomes are similar from one allopolyploidization event to another, gene-level and genome dominance patterns should also be similar.

两个亲本对同质多倍体的非累加贡献的经典例子是核仁优势，这需要使一组亲本核糖体RNA基因沉默。对于许多其他基因座已经观察到了这一点。对于这种全基因组表达差异的普遍解释是，这两个合并的基因组在其转座因子（TE）补体和TE介导的基因表达抑制水平上有所不同。可替代地，但非排他性地，基因表达的优势可能是由反式之间的错配引起的效应子及其目标。在这里，我们探索导致基因表达优势的调控错配的定量模型。我们还建议，当从一个同质多倍体化事件到另一个事件，相似的合并基因组对相似时，基因水平和基因组优势模式也应该相似。