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Related Concept Videos

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...
Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
Multi-species Conserved Sequences02:51

Multi-species Conserved Sequences

Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale  studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
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...
Synteny and Evolution02:31

Synteny and Evolution

John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...

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Related Experiment Video

Updated: Jul 13, 2026

Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis
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Estimation of DNA sequence context-dependent mutation rates using primate genomic sequences.

Wei Zhang1, Gerard G Bouffard, Susan S Wallace

  • 1Department of Medicine, University of Chicago, 515 CLSC, Chicago, IL 60637, USA.

Journal of Molecular Evolution
|August 7, 2007
PubMed
Summary

DNA mutation rates depend on their surrounding sequence context. CpG sites significantly influence substitution rates, with CpG transitions and transversions being particularly frequent in primates.

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Molecular Biology

Background:

  • Nucleotide and amino acid substitution rates are crucial for phylogenetic inference and functional analysis.
  • Understanding sequence context dependence is vital for accurate evolutionary modeling.

Purpose of the Study:

  • To quantify the context dependence of nucleotide substitution rates in primate DNA.
  • To develop a quantitative model for context-dependent DNA evolution.

Main Methods:

  • Analysis of genomic sequence data from baboon, chimpanzee, and human.
  • Calculation of relative mutation rates for 96 mutation classes (5' alphabetagamma 3' --> 5' alphadeltagamma 3').
  • Application of maximum likelihood calculations to determine mutation rates.

Main Results:

  • C --> T substitutions are significantly enhanced at CpG sites.
  • CpG transversions occur at rates comparable to non-CpG transitions.
  • A four-class model (CpG transitions > non-CpG transitions ≈ CpG transversions > non-CpG transversions) accurately describes primate DNA mutation spectrum.
  • Statistically significant differences in mutation rates exist across different genomic regions.

Conclusions:

  • Sequence context, particularly CpG sites, profoundly impacts DNA substitution rates in primates.
  • The characterized mutation spectrum provides a foundation for more accurate phylogenetic and evolutionary analyses.
  • Genomic region-specific mutation rate variations warrant further investigation.