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Related Concept Videos

Mutations01:39

Mutations

Overview
Mutations01:39

Mutations

Overview
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
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,...
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,...
Exon Recombination02:32

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
Exon shuffling follows “splice frame rules.” Each exon has three reading...

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Related Experiment Video

Updated: Jun 25, 2026

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

Evolution models with base substitutions, insertions, deletions, and selection.

D B Saakian1

  • 1Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan. saakian@yerphi.am

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

This study models evolution with mutations like substitutions, insertions, and deletions. It finds that evolution characteristics, especially with insertions and deletions, depend on the reference sequence used.

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Bioinformatics

Background:

  • Understanding evolutionary dynamics requires modeling mutation and selection processes.
  • Previous models often simplified mutation types or fitness landscapes.

Purpose of the Study:

  • To analyze an evolution model incorporating parallel mutation-selection with base substitutions, insertions, and deletions.
  • To investigate fitness landscapes defined by single-peak or smooth functions of Hamming distance.
  • To calculate mean fitness in the large-genome limit.

Main Methods:

  • Solving an evolution model with a parallel mutation-selection scheme.
  • Analyzing fitness functions based on Hamming distance from a reference sequence.
  • Exact calculation of mean fitness in the large-genome limit.

Main Results:

  • The model was solved for evolution with substitutions, insertions, and deletions.
  • Mean fitness was calculated exactly for single-peak and smooth fitness functions.
  • Evolution characteristics, particularly with insertions/deletions, were shown to be reference-sequence dependent.

Conclusions:

  • The study provides an exact solution for a complex evolution model.
  • Reference sequence choice significantly impacts evolutionary outcomes when insertions and deletions are involved.
  • Findings are relevant for understanding genome evolution and sequence analysis.