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Related Concept Videos

Mutations in Microorganisms01:18

Mutations in Microorganisms

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,...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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.
In contrast, regions which code...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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.
In contrast, regions which code...
Viral Mutations00:36

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
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: Jun 11, 2026

Measuring Microbial Mutation Rates with the Fluctuation Assay
07:44

Measuring Microbial Mutation Rates with the Fluctuation Assay

Published on: November 28, 2019

Evolution of the mutation rate.

Michael Lynch1

  • 1Department of Biology, Indiana University, Bloomington, IN 47405, USA. milynch@indiana.edu

Trends in Genetics : TIG
|July 3, 2010
PubMed
Summary
This summary is machine-generated.

New mutation rates in organisms are influenced by genome size and natural selection. Eukaryotes exhibit lower replication and transcription fidelity compared to prokaryotes due to evolutionary pressures.

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Last Updated: Jun 11, 2026

Measuring Microbial Mutation Rates with the Fluctuation Assay
07:44

Measuring Microbial Mutation Rates with the Fluctuation Assay

Published on: November 28, 2019

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Area of Science:

  • Evolutionary biology
  • Molecular biology
  • Genetics

Background:

  • Understanding evolutionary mechanisms necessitates data on mutation rates and their molecular/phenotypic effects.
  • High-throughput genome sequencing advances knowledge in this field, overcoming previous technical challenges.

Purpose of the Study:

  • To investigate patterns in spontaneous mutation rates across various organisms.
  • To explore the relationship between mutation rate, genome size, and evolutionary forces.
  • To test the hypothesis that natural selection, not physiological limits, determines minimal mutation rates.

Main Methods:

  • Analysis of spontaneous mutation data from diverse organisms.
  • Examination of general patterns in mutation rate scaling with genome size.
  • Comparative analysis of molecular fidelity (replication, transcription, translation) between eukaryotes and prokaryotes.

Main Results:

  • General patterns observed in mutation rate scaling with genome size.
  • Evidence supporting the hypothesis that natural selection drives mutation rates lower.
  • Eukaryotes show reduced replication, transcription, and translation fidelity compared to prokaryotes.

Conclusions:

  • Mutation rates are shaped by natural selection, reaching a lower limit imposed by random genetic drift.
  • Evolutionary pressures have led to decreased molecular fidelity in eukaryotes relative to prokaryotes.
  • This study provides insights into the fundamental mechanisms of molecular evolution and genome dynamics.