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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...
Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
Evolution of Microbial Genome01:08

Evolution of Microbial Genome

Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

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).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...

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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

Deletion rate evolution and its effect on genome size and coding density.

Mats E Pettersson1, Charles G Kurland, Otto G Berg

  • 1Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala, Sweden.

Molecular Biology and Evolution
|March 20, 2009
PubMed
Summary
This summary is machine-generated.

Genome size regulation is complex. Mathematical models show deletion rates, essential genetic material, and reproduction influence genome evolution, with no single optimal deletion rate found.

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Last Updated: Jun 24, 2026

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Mathematical modeling

Background:

  • Deletion rates are hypothesized to influence organism genome size.
  • The precise regulatory role of deletion rates in genome size determination remains unclear.

Purpose of the Study:

  • To investigate the evolutionary dynamics of deletion rate mutations using a mathematical model.
  • To explore the interplay between deletions, deletion rate mutants, and genome size regulation.

Main Methods:

  • Development of a mathematical model to simulate evolutionary trajectories.
  • Computational simulations to analyze interactions between genomic elements and mutation rates.

Main Results:

  • The evolutionary fate of deletion rate mutants is contingent upon essential genetic material fraction, sexual recombination frequency, and population size.
  • No universal optimal deletion rate exists; neutrality occurs at a critical coding density, allowing for rate drift.
  • Prokaryotic and eukaryotic genomes exhibit distinct responses to deletion rate mutations.

Conclusions:

  • Genome size regulation is not driven by a single optimal deletion rate.
  • Coding density is expected to fluctuate around a critical threshold due to neutral drift in deletion rates.
  • Understanding deletion rate dynamics is crucial for comprehending genome size evolution across different life forms.