Rho-dependent termination: a bacterial evolutionary capacitor for stress resistance

Area of Science:

• Evolutionary biology
• Microbial genetics
• Molecular biology

Background:

• The "black box" between genotype and phenotype involves plastic molecules like RNA and proteins.
• Evolutionary capacitors buffer genetic variation and reveal it under stress, with focus often on eukaryotic factors (e.g., Hsp90).
• Prokaryotic transcription factors, due to coupled transcription-translation, also significantly modulate gene expression and phenotypes.

Purpose of the Study:

• To review the role of the prokaryotic transcription terminator Rho as an evolutionary capacitor.
• To explore how Rho's mutagenesis and plasticity impact bacterial epistasis, evolvability, and stress adaptation.
• To examine the influence of Rho's interactome on its variation.

Main Methods:

• Review of existing literature on Rho function and variation.
• Analysis of Rho mutagenesis from natural, laboratory, and experimental evolution contexts.
• Examination of Rho's protein interaction network.

Main Results:

• Mutations and plasticity in Rho influence epistasis and evolvability in bacteria.
• Rho variation, influenced by its interactors, affects adaptation to environmental stress.
• Rho functions as a key evolutionary capacitor in prokaryotes.

Conclusions:

• Rho's role as an evolutionary capacitor is critical for understanding bacterial adaptation.
• Identifying additional prokaryotic evolutionary capacitors will advance our knowledge of organismal adaptation.
• Understanding Rho's plasticity offers insights into how bacteria evolve and adapt to diverse environments.