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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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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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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Adaptive evolution after gene duplication.

Austin L Hughes1

  • 1Depatment of Biological Sciences, University of South Carolina, Columbia, SC 29208, USA. austin@biol.sc.edu

Trends in Genetics : TIG
|August 15, 2002
PubMed
Summary
This summary is machine-generated.

Gene duplication in leaf-eating monkeys led to a ribonuclease enzyme specializing in digesting bacterial RNA. This adaptation showcases how gene duplication drives the evolution of new protein functions.

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Area of Science:

  • Evolutionary biology
  • Molecular biology
  • Biochemistry

Background:

  • Gene duplication is a key mechanism driving evolutionary innovation.
  • Ribonucleases (RNases) are enzymes that degrade RNA.
  • Understanding enzyme adaptation provides insights into functional diversification.

Discussion:

  • A specific ribonuclease gene in leaf-eating monkeys duplicated and evolved.
  • The duplicated gene adapted to digest bacterial RNA, a novel function.
  • Amino acid sequence changes were crucial for this functional specialization.

Key Insights:

  • Demonstrates functional specialization of a duplicated gene.
  • Highlights the role of protein sequence evolution in adaptation.
  • Provides a model for the emergence of novel enzyme functions.

Outlook:

  • Further research can explore the specific selective pressures driving this adaptation.
  • Comparative studies can reveal other instances of RNase gene adaptation.
  • This work contributes to understanding the genetic basis of dietary adaptations.