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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...
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.
Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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.

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Related Experiment Video

Updated: May 20, 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

SINEs as driving forces in genome evolution.

J Schmitz1

  • 1Institute of Experimental Pathology, University of Münster, Münster, Germany. jueschm@uni-muenster.de

Genome Dynamics
|July 5, 2012
PubMed
Summary
This summary is machine-generated.

Short interspersed elements (SINEs) are mobile genetic sequences that shape genomes. While posing challenges to genomic integrity, SINEs also drive evolutionary innovation and phenotypic diversity in mammals.

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Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells
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Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells

Published on: April 4, 2016

Related Experiment Videos

Last Updated: May 20, 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

Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells
14:26

Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells

Published on: April 4, 2016

Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Short interspersed elements (SINEs) are repetitive DNA sequences originating from cellular RNAs.
  • SINEs propagate via RNA intermediates and integrate into the genome, relying on autonomous retrotransposons like LINEs for activity.
  • These elements are widespread in eukaryotes, with significant proliferation in mammalian genomes, such as the human genome.

Purpose of the Study:

  • To explore the dual role of SINEs in genomic integrity and evolutionary adaptation.
  • To understand the mechanisms of SINE propagation and their impact on host genomes.
  • To highlight the significance of SINEs in generating structural variation and modifying gene expression.

Main Methods:

  • Analysis of SINE distribution and activity in eukaryotic genomes, with a focus on mammals.
  • Investigation of the non-autonomous nature of SINEs and their dependence on LINE machinery.
  • Review of literature on the functional consequences of SINE integration.

Main Results:

  • SINEs contribute significantly to genomic space expansion and structural variation.
  • Active SINEs can mutate genes, alter gene expression, and create novel gene structures.
  • Despite potential challenges to genomic integrity, SINEs are crucial for evolutionary innovation.

Conclusions:

  • SINEs play a complex role, acting as both a challenge and a benefit to host genomes.
  • Controlled SINE activity is vital for maintaining genomic dynamism and enabling evolutionary progress.
  • SINEs are powerful drivers of phenotypic heterogeneity and gene regulatory network evolution.