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Related Concept Videos

Mutations in Microorganisms01:18

Mutations in Microorganisms

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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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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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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
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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.
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Epistasis01:39

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Epimutations and mutations, nurturing phenotypic diversity.

Jasmine M Shah1

  • 1Central University of Kerala, Kasaragod, Kerala, 671320, India. jasmine@cukerala.ac.in.

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|June 11, 2021
PubMed
Summary
This summary is machine-generated.

Epimutations and mutations drive organism diversity. Understanding their interplay is crucial for molecular evolution, speciation, and resolving taxonomic classifications.

Keywords:
EpigeneticsEpimutationsMethylationMolecular evolutionMutationsSpeciation

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genetics

Background:

  • Epimutations and mutations are distinct genetic mechanisms causing phenotypic diversity.
  • Epigenetic modifications and mutations can influence each other, impacting genome stability.
  • Interactions between epigenetic changes and mutations are key to understanding molecular evolution.

Purpose of the Study:

  • To elucidate the nature of epimutations and their relationship with mutations.
  • To explore the interdependence of epigenetic modifications and DNA mutations.
  • To highlight the role of both epimutations and mutations in speciation and taxonomy.

Main Methods:

  • Review of existing literature on epimutations and mutations.
  • Analysis of the interplay between genetic and epigenetic changes.
  • Synthesis of information on factors influencing epigenetic modifications and mutation hotspots.

Main Results:

  • Epimutations and mutations, while different, are interconnected and affect each other.
  • The combined influence of epimutations and mutations contributes significantly to phenotypic variation.
  • Understanding these interactions is vital for interpreting evolutionary processes.

Conclusions:

  • Epimutations and mutations jointly drive molecular evolution and speciation.
  • Considering both genetic and epigenetic changes aids in taxonomic classification and species identification.
  • This integrated approach offers a more comprehensive view of organismal diversity.