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Related Concept Videos

Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
Hybrid Zones02:29

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...
Formation of Species01:31

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...
Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Mismatch Repair01:36

Mismatch Repair

Overview

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Related Experiment Video

Updated: Jul 19, 2026

Quasi-metagenomic Analysis of Salmonella from Food and Environmental Samples
06:12

Quasi-metagenomic Analysis of Salmonella from Food and Environmental Samples

Published on: October 25, 2018

Mismatch induced speciation in Salmonella: model and data.

Daniel Falush1, Mia Torpdahl, Xavier Didelot

  • 1Peter Medawar Building for Pathogen Research, Oxford University, Oxford OX1 3SY, UK. falush@stats.ox.ac.uk

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|October 26, 2006
PubMed
Summary

DNA sequence mismatches can drive bacterial speciation in large populations, potentially explaining Salmonella genus divergence without natural selection. This model suggests Salmonella subspecies are distinct biological species.

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High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages

Published on: August 11, 2014

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Last Updated: Jul 19, 2026

Quasi-metagenomic Analysis of Salmonella from Food and Environmental Samples
06:12

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Published on: October 25, 2018

High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages
11:10

High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages

Published on: August 11, 2014

Area of Science:

  • Microbial genetics
  • Evolutionary biology
  • Computational biology

Background:

  • DNA sequence mismatches limit recombination between distinct bacterial species.
  • This barrier can promote species cohesion.
  • Understanding bacterial speciation is crucial for microbial ecology.

Purpose of the Study:

  • To investigate if homology-dependent recombination can drive de novo bacterial speciation.
  • To model the impact of recombination barriers on species formation.
  • To explain divergence patterns in the Salmonella genus.

Main Methods:

  • Computer simulations of bacterial populations.
  • Modeling homology dependence of recombination.
  • Analysis of multilocus sequence typing data.

Main Results:

  • Homology-dependent recombination can cause speciation in neutrally evolving populations exceeding a critical size.
  • The model explains Salmonella divergence and genetic exchange patterns without natural selection or geographic subdivision.
  • Multilocus sequence typing data may mislead regarding relationships within Salmonella enterica subspecies enterica.

Conclusions:

  • Bacterial speciation can arise from DNA mismatch barriers and population size, independent of selection.
  • The model supports Salmonella subspecies as distinct biological species with objective boundaries.
  • Current typing methods may lack resolution to detect ongoing speciation events in Salmonella.