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Related Concept Videos

Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

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Genome Size and the Evolution of New Genes03:21

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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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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.
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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
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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).
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Overlapping genes: a window on gene evolvability.

Maxime Huvet1, Michael P H Stumpf

  • 1Theoretical Systems Biology Group, Department of life sciences, Imperial College London, London SW7 2AZ, UK. m.huvet@imperial.ac.uk.

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Summary
This summary is machine-generated.

Overlapping genes, common in bacteria, are highly adaptable. Their evolutionary origins are explained by a model focusing on gene expression processes like transcription and translation.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Genome architecture and organization forces remain poorly understood.
  • Overlapping genes are a conserved feature across diverse organisms, with a third of bacterial genes involved.
  • The evolutionary origins and biological impact of overlapping genes are not fully explained.

Purpose of the Study:

  • To investigate the evolutionary dynamics of overlapping genes using a comparative genomic approach.
  • To shed light on the plasticity and underlying mechanisms of overlapping gene structures.

Main Methods:

  • Comparative analysis of 699 bacterial genomes.
  • Development of a model explaining overlapping gene properties.

Main Results:

  • Overlapping gene structures demonstrate significant evolutionary plasticity.
  • A model was developed to explain observed properties of overlapping genes.

Conclusions:

  • The study proposes a model linking overlapping genes to transcriptional and translational processes.
  • Understanding gene expression mechanisms is key to deciphering overlapping gene structures.