4.8 Article

A Near-Deterministic Mutational Hotspot in Pseudomonas fluorescens Is Constructed by Multiple Interacting Genomic Features

期刊

MOLECULAR BIOLOGY AND EVOLUTION
卷 39, 期 6, 页码 -

出版社

OXFORD UNIV PRESS
DOI: 10.1093/molbev/msac132

关键词

mutation hotspot; Mutation bias; predicting evolution

资金

  1. Royal Society [RG160491, DH150169]
  2. University of Bath University Research Studentship Account
  3. BBSRC NI grant [BB/T012994/1]

向作者/读者索取更多资源

This study reveals the importance of genomic features in facilitating the formation of mutational hotspots, including genomic location, local nucleotide sequence, gene strandedness, and the presence of mismatch repair proteins.
Mutation-whilst stochastic-is frequently biased toward certain loci. When combined with selection, this results in highly repeatable and predictable evolutionary outcomes. Immotile variants of the bacterium Pseudomonas fluorescens (SBW25) possess a mutational hotspot that facilitates repeated occurrences of an identical de novo single nucleotide polymorphism when re-evolving motility, where >= 95% independent lines fix the mutation ntrB A289C. Identifying hotspots of similar potency in other genes and genomic backgrounds would prove valuable for predictive evolutionary models but to do so we must understand the genomic features that enable such a hotspot to form. Here, we reveal that genomic location, local nucleotide sequence, gene strandedness, and presence of mismatch repair proteins operate in combination to facilitate the formation of this mutational hotspot. Our study therefore provides a framework for utilizing genomic features to predict and identify hotspot positions capable of enforcing near-deterministic evolution.

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