Protein-coding changes preceded cis-regulatory gains in a newly evolved transcription circuit.

Protein-coding changes preceded cis-regulatory gains in a newly evolved transcription circuit.
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DOI:
10.1126/science.aax5217
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发表时间:
2020-01-03
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Johnson AD
Johnson AD
中科院分区:
其他
文献类型:
--
作者:
Britton CS;Sorrells TR;Johnson AD

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转录调控因子的编码序列和这些调控因子所识别的顺式调控序列的变化都与转录回路的进化有关。然而,很少有人知道它们是如何协同进化的。我们描述了真菌中的一个进化途径,其中一个新的转录回路(同源结构域蛋白Matα2的a特异性基因抑制)是通过这个古老调节子的编码变化进化而来的,数百万年后,其未来调节子的基因中的顺式调节序列发生变化。通过分析一组物种,已获得的编码变化,但不是顺式调控位点,我们表明,编码变化成为必要的调节器的深度保守的功能,从而平衡调节器跳跃开始形成新的电路。
Changes in both the coding sequence of transcriptional regulators and in the cis-regulatory sequences recognized by these regulators have been implicated in the evolution of transcriptional circuits. However, little is known about how they evolved in concert. We describe an evolutionary pathway in fungi where a new transcriptional circuit (a-specific gene repression by the homeodomain protein Matα2) evolved by coding changes in this ancient regulator, followed millions of years later by cis-regulatory sequence changes in the genes of its future regulon. By analyzing a group of species that has acquired the coding changes but not the cis-regulatory sites, we show that the coding changes became necessary for the regulator’s deeply conserved function, thereby poising the regulator to jump-start formation of the new circuit.
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