Inferring regulatory mechanisms from patterns of evolutionary divergence

Abstract

Evolutionary conservation is widely used for assigning functions to proteins and genomic sequences. A complementary approach is discussed here whereby patterns of evolutionary divergence in regulatory programs provide novel insights into the mechanisms controlling gene expression.

Abstract

The number of sequenced species is increasing at a staggering rate, calling for new approaches for incorporating evolutionary information in the study of biological mechanisms. Evolutionary conservation is widely used for assigning a function to new proteins and for predicting functional coding or non-coding sequences. Here, we argue for a complementary approach that focuses on the divergence of regulatory programs. Regulatory mechanisms can be learned from patterns of evolutionary divergence in regulatory properties such as gene expression, transcription factor binding or nucleosome positioning. We review examples of this concept using yeast as a model system, and highlight a hybrid-based approach that is highly instrumental in this analysis.