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An Integrated Workflow to Study the Promoter-Centric Spatio-Temporal Genome Architecture in Scarce Cell Populations
Published on: April 21, 2023
Coevolution within and between regulatory loci can preserve promoter function despite evolutionary rate acceleration
Antoine Barrière1, Kacy L Gordon, Ilya Ruvinsky
1Department of Ecology and Evolution and Institute for Genomics and Systems Biology, The University of Chicago, Chicago, Illinois, United States of America.
Plos Genetics
|October 3, 2012
Summary
Compensatory mutations in regulatory elements help maintain gene expression patterns across species. This study reveals how subtle genetic changes in cis and trans regulators coevolve to preserve conserved phenotypes.
Area of Science:
- Evolutionary biology
- Genetics
- Molecular biology
Background:
- Conserved phenotypes can arise from strong selection or compensatory mutations.
- Coevolution of genetic elements is a proposed mechanism but rarely studied.
- The unc-47 gene promoter in nematodes shows conserved expression despite sequence divergence.
Purpose of the Study:
- Investigate the role of compensatory mutations in maintaining conserved gene expression.
- Examine the coevolution of cis-regulatory elements and trans-regulatory factors.
- Understand the mechanisms driving regulatory evolution in nematodes.
Main Methods:
- Comparative analysis of unc-47 promoters from Caenorhabditis elegans and C. briggsae.
- Functional assays using heterologous expression systems to test promoter activity.
- Sequence analysis to identify accelerated evolution and potential compensatory changes.
Main Results:
- Conserved expression of unc-47 was maintained despite divergence in cis-regulatory elements and trans-regulatory environments.
- Cross-species promoter transplantation revealed compensatory changes in cis and trans elements.
- Accelerated sequence evolution in the C. briggsae promoter did not alter endogenous gene expression.
Conclusions:
- Coevolution of interacting cis and trans regulatory elements contributes to maintaining conserved gene expression.
- Complex epistatic interactions within regulatory elements may drive their divergence.
- Subtle, lineage-specific modifications in regulatory interactions shape conserved gene expression patterns.
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