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Mutations01:39

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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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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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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Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...
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Measuring Microbial Mutation Rates with the Fluctuation Assay
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Disentangling strictly self-serving mutations from win-win mutations in a mutualistic microbial community.

Samuel Frederick Mock Hart1, Jose Mario Bello Pineda1, Chi-Chun Chen1

  • 1Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, United States.

Elife
|June 5, 2019
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Summary

Win-win mutations in mutualisms may not benefit partners. A yeast study showed a mutation improving self-benefit also increased resource use, leaving partner benefit unchanged. This redefines how we assess cooperation.

Keywords:
S. cerevisiaebenefitcostecologyevolutionevolutionary biologymutualismpartner-serving

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Area of Science:

  • Evolutionary biology
  • Microbial ecology
  • Systems biology

Background:

  • Mutualisms, symbiotic relationships benefiting all partners, can be enhanced by pleiotropic mutations.
  • These mutations offer direct benefits to the individual (self-serving) and its partner (partner-serving).
  • Partner-serving benefits are often quantified by an individual's benefit supply rate to partners.

Purpose of the Study:

  • To challenge the conventional quantification of partner-serving phenotypes in mutualisms.
  • To propose and test an alternative metric for evaluating mutualistic interactions under genetic variation.
  • To investigate the long-term effects of seemingly beneficial mutations on cooperative dynamics.

Main Methods:

  • Evolving well-mixed mutualistic communities of two engineered yeast strains.
  • Utilizing yeast strains engineered to exchange essential metabolites: lysine and hypoxanthine.
  • Analyzing a specific chromosome duplication mutation affecting lysine affinity and hypoxanthine release.

Main Results:

  • A chromosome duplication mutation improved yeast's lysine affinity (self-serving benefit).
  • The mutation increased hypoxanthine release rate per cell, but also increased cell size and lysine utilization per birth.
  • The exchange ratio (total hypoxanthine release per lysine utilization) remained unchanged, indicating no net benefit to the partner.
  • The mutation did not increase the partner's steady-state growth rate, classifying it as solely self-serving in the long term.

Conclusions:

  • The direct measure of benefit supply rate is insufficient for quantifying partner-serving phenotypes in mutualisms.
  • An individual's increased benefit production rate does not automatically imply a net benefit to the partner.
  • Reduced benefit production rate by an individual does not necessarily equate to cheating within a mutualistic system.