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Gene Conversion

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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...

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Updated: Sep 18, 2025

Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations

Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations

Published on: December 7, 2021

How recombination and clonal evolution shape bacterial lineages and genomes.

Asher Preska Steinberg¹, Edo Kussell^1,2

¹Department of Biology and Center for Genomics and Systems Biology, New York University, New York, NY 10003, USA.

|June 24, 2025

Summary

This summary is machine-generated.

Homologous recombination and clonal evolution significantly shape bacterial genomes. Our study reveals a substantial clonal signal in bacterial populations, challenging previous notions of dominant recombination.

Keywords:

bacteria clonality coalescent theory population genetics recombination

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Area of Science:

Microbiology
Evolutionary Biology
Genomics

Background:

Homologous recombination is crucial for bacterial genome evolution.
Previous studies suggested dominant recombination, leaving minimal clonal fraction in some species.
Scale-free distributions of recombination rates were proposed to structure bacterial phylogenies.

Purpose of the Study:

To determine how recombination and clonal evolution shape bacterial lineages and genome structures.
To analyze sequencing data from over 100,000 genomes across 12 bacterial species.
To re-evaluate the role of recombination versus clonal evolution in bacterial diversity.

Main Methods:

Analysis of large-scale bacterial genome sequencing data (>100,000 genomes).
Application of a coalescent model for populations with varying gene pools.
Regression analysis to quantify the impact of recombination and clonal evolution.

Main Results:

A substantial clonal signal was detected in all analyzed global bacterial populations.
Inferred recombination rates typically vary by less than an order of magnitude within species.
Power-law SNP distributions can arise from clonal genealogies recombining at a constant rate, not necessarily wide rate variations.

Conclusions:

Bacterial phylogenies are influenced by both recombination and clonal evolution.
Recombination rates are generally less variable within species than previously suggested.
Findings impact the interpretation of bacterial phylogeny and the understanding of species diversity.