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Mutations in Microorganisms01:18

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Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Experimental evolution and the dynamics of genomic mutation rate modifiers.

Y Raynes1, P D Sniegowski2

  • 1Center for Computational Molecular Biology, Brown University, Providence, RI, USA.

Heredity
|May 23, 2014
PubMed
Summary

Mutation rates can change due to evolutionary forces acting on genes that control them. Experimental studies show mutator alleles can increase mutation rates, but how this is suppressed in nature needs more research.

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Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Molecular Biology

Background:

  • Genes influencing mutation rates are themselves subject to mutation.
  • The population genetics of mutation rate modifiers has been studied theoretically for decades.
  • Experimental evidence is crucial for understanding mutation rate dynamics.

Purpose of the Study:

  • To review experimental contributions to understanding mutation rate modifier dynamics.
  • To explore how mutator hitchhiking is suppressed or reversed in natural populations.
  • To identify areas for future experimental investigation.

Main Methods:

  • Review of numerous evolution experiments.
  • Analysis of genetic hitchhiking in microbial populations.
  • Theoretical considerations of natural selection and evolutionary forces.

Main Results:

  • Mutator alleles readily increase in frequency via genetic hitchhiking in non-recombining microbial populations.
  • These findings offer a framework for understanding high mutation rates in pathogens and cancer.
  • Most natural populations exhibit very low mutation rates, contrasting with mutator dynamics.

Conclusions:

  • Experimental evolution experiments demonstrate the potential for mutator alleles to increase mutation rates.
  • The suppression or reversal of mutator hitchhiking in natural populations remains poorly understood.
  • Further experimental research is needed to address the low mutation rates observed in most natural populations.