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Related Concept Videos

Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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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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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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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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Related Experiment Video

Updated: Mar 19, 2026

Measuring Microbial Mutation Rates with the Fluctuation Assay
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Measuring Microbial Mutation Rates with the Fluctuation Assay

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Mutation rates and the evolution of germline structure.

Aylwyn Scally1

  • 1Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK aos21@cam.ac.uk.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|June 22, 2016
PubMed
Summary

Human germline mutation rates are lower than expected, challenging current models. A revised model of spermatogenesis, involving

Area of Science:

  • Evolutionary biology
  • Genetics
  • Human evolution

Background:

  • Genome sequencing reveals discrepancies between observed human germline mutation rates and estimates from the fossil record.
  • The paternal age effect on mutations is weaker than predicted by existing models of spermatogenesis.

Purpose of the Study:

  • To explore explanations for incongruities in human germline mutation rates and the paternal age effect.
  • To propose a revised model of spermatogenesis that accounts for observed mutation patterns.

Main Methods:

  • Analysis of genome sequencing data.
  • Review of existing models of spermatogenesis and human life-history parameters.
  • Development of a revised model for stem-cell transitions in spermatogenesis.
Keywords:
germlinehuman evolutionmutation rate

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Main Results:

  • Observed human mutation rates are lower than fossil-calibrated estimates.
  • The paternal age effect is less pronounced than previously modeled.
  • A revised model incorporating 'dark' gonial stem cells with long cycle times offers a potential explanation.

Conclusions:

  • Human germline mutation rates and their evolution are intricately linked to primate germline structure.
  • Existing models of spermatogenesis may underestimate the role of specific stem cell populations.
  • Further research into primate germline dynamics is crucial for understanding mutation processes.