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Related Concept Videos

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.
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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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Measuring Microbial Mutation Rates with the Fluctuation Assay
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Evidence that replication-associated mutation alone does not explain between-chromosome differences in substitution

Catherine J Pink1, Siva K Swaminathan, Ian Dunham

  • 1Department of Biology and Biochemistry, University of Bath, Bath, Somerset, United Kingdom.

Genome Biology and Evolution
|March 25, 2010
PubMed
Summary

Most mutations arise from germ line replication errors, leading to a male mutation bias. However, this study reveals that evolutionary rate comparisons between chromosomes are unreliable, suggesting other factors influence mutation rates.

Keywords:
intronsmale-driven evolutionmale-mutation biasmutationrecombinationrodents

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Molecular evolution

Background:

  • Paternally derived mutations suggest germ line replication errors are the primary source of mutations.
  • The Miyata et al. (1987) method uses neutral evolution rates across chromosomes to estimate male mutation bias.
  • This method assumes replication is the only factor causing rate variation between chromosomes.

Purpose of the Study:

  • To test the assumption that replication is the sole source of between-chromosome variation in substitution rates.
  • To investigate if male mutation bias estimates are independent of the chromosomal classes compared.
  • To explore alternative causes of substitution rate variation.

Main Methods:

  • Sequenced two rat Y-linked bacterial artificial chromosomes.
  • Determined evolutionary rates by comparing rat and mouse Y-linked sequences.
  • Analyzed both introns and synonymous rates for evolutionary rate estimation.

Main Results:

  • Estimates of male bias (alpha) were not congruent across different chromosomal comparisons, strongly rejecting the Miyata et al. assumption.
  • Some comparisons indicated a female bias, with autosomes evolving faster than Y-linked sequences.
  • Evidence suggests recombination-associated substitution bias may contribute to rate variation.

Conclusions:

  • The Miyata et al. (1987) method for estimating male mutation bias can yield incorrect results.
  • Understanding other causes of substitution rate variation between chromosomal classes is crucial for accurate bias estimation.
  • Recombination-associated substitution bias, potentially linked to male recombination, may explain observed patterns, including high bias in birds' Z chromosomes.