Molecular evolution in the yeast transcriptional regulation network

被引:27
作者
Evangelisti, AM [1 ]
Wagner, A [1 ]
机构
[1] Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA
关键词
D O I
10.1002/jez.b.20027
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
We analyze the structure of the yeast transcriptional regulation network, As revealed by chromatin immunoprecipitation experiments, and characterize the molecular evolution of both. its transcriptional regulators and their target (regulated) genes. We test the hypothesis that highly connected genes are more important to the function of gene networks. Three lines of evidence-the rate of molecular evolution of network genes, the rate at which network genes undergo gene duplication, and the effects of synthetic null mutation in network genes-provide no strong support for this hypothesis. In addition, we ask how network genes diverge in their transcriptional regulation after duplication. Both loss (subfunctionalization) and gain (neofunctionalization) of transcription factor binding play a role in this divergence, which is often rapid. On the one hand, gene duplicates experience a net loss in the number of transcription factors binding to them, indicating the importance of losing transcription factor binding sites after gene duplication; On the other hand, the number of transcription factors that bind to highly diverged duplicates is significantly greater than would be expected if loss of binding played the only role in the divergence of duplicate genes. (C) 2004 Wiley-Liss, Inc.
引用
收藏
页码:392 / 411
页数:20
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