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通过对调控小 RNA 的选择来进化花的颜色模式。

Evolution of flower color pattern through selection on regulatory small RNAs.

机构信息

Department of Cell and Developmental Biology, John Innes Centre, Colney Lane, Norwich NR4 7UH, UK.

School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, UK.

出版信息

Science. 2017 Nov 17;358(6365):925-928. doi: 10.1126/science.aao3526.

Abstract

Small RNAs (sRNAs) regulate genes in plants and animals. Here, we show that population-wide differences in color patterns in snapdragon flowers are caused by an inverted duplication that generates sRNAs. The complexity and size of the transcripts indicate that the duplication represents an intermediate on the pathway to microRNA evolution. The sRNAs repress a pigment biosynthesis gene, creating a yellow highlight at the site of pollinator entry. The inverted duplication exhibits steep clines in allele frequency in a natural hybrid zone, showing that the allele is under selection. Thus, regulatory interactions of evolutionarily recent sRNAs can be acted upon by selection and contribute to the evolution of phenotypic diversity.

摘要

小 RNA(sRNAs)在动植物中调节基因。在这里,我们发现金鱼草花的颜色图案的群体差异是由产生 sRNAs 的反向重复引起的。转录本的复杂性和大小表明,该重复是 miRNA 进化途径上的一个中间产物。sRNAs 抑制了一个色素生物合成基因,在传粉者进入的地方产生了黄色的亮点。反向重复在自然杂交区的等位基因频率上表现出陡峭的梯度,表明该等位基因受到选择。因此,进化上较新的 sRNAs 的调控相互作用可以受到选择的影响,并有助于表型多样性的进化。

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