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Evolution of Homeologous Gene Expression in Polyploid Wheat. | LitMetric

AI Article Synopsis

  • * The study identified differentially expressed genes (DEGs) in multiple tetraploid wheat varieties, revealing uneven distribution among functional categories and more DEGs in extracted tetraploid wheat compared to natural or synthetic ones.
  • * Findings show that DEGs and non-DEGs have experienced different selection pressures, and that regulatory changes within and between subgenomes are key in shaping the expression of homeologous genes, with ploidy playing a crucial role.

Article Abstract

Polyploidization has played a prominent role in the evolutionary history of plants. Two recent and sequential allopolyploidization events have resulted in the formation of wheat species with different ploidies, and which provide a model to study the effects of polyploidization on the evolution of gene expression. In this study, we identified differentially expressed genes (DEGs) between four BBAA tetraploid wheats of three different ploidy backgrounds. DEGs were found to be unevenly distributed among functional categories and duplication modes. We observed more DEGs in the extracted tetraploid wheat (ETW) than in natural tetraploid wheats (TD and TTR13) as compared to a synthetic tetraploid (AT2). Furthermore, DEGs showed higher ratios than those that did not show expression changes (non-DEGs) between genotypes, indicating DEGs and non-DEGs experienced different selection pressures. For A-B homeolog pairs with DEGs, most of them had only one differentially expressed copy, however, when both copies of a homeolog pair were DEGs, the A and B copies were more likely to be regulated to the same direction. Our results suggest that both - and inter-subgenome -regulatory changes are important drivers in the evolution of homeologous gene expression in polyploid wheat, with ploidy playing a significant role in the process.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7759873PMC
http://dx.doi.org/10.3390/genes11121401DOI Listing

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