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Related Experiment Videos

Signatures of adaptive evolution within human non-coding sequence.

Chris P Ponting1, Gerton Lunter

  • 1MRC Functional Genetics Unit, Department of Physiology, Anatomy and Genetics, University of Oxford, South Parks Road, Oxford OX1 3QX, UK. chris.poting@anat.ox.ac.uk

Human Molecular Genetics
|September 22, 2006
PubMed
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The human genome contains functional non-coding DNA that evolved through positive selection, not just neutral evolution. This "adaptive dark matter" outside protein-coding genes holds crucial insights into human evolution and biology.

Area of Science:

  • Evolutionary biology
  • Genomics
  • Molecular evolution

Background:

  • The human genome is traditionally viewed as having three evolutionary modes: purifying selection, neutral evolution, and rare positive selection.
  • Most of the genome is considered neutral and non-functional, with positive selection primarily observed in protein-coding genes.

Purpose of the Study:

  • To review evolutionary evidence for conserved DNA outside protein-coding regions.
  • To highlight the significance of non-coding DNA in human evolution.
  • To investigate the concept of "adaptive dark matter" in the human genome.

Main Methods:

  • Review of evolutionary evidence for conserved DNA.
  • Analysis of nucleotide replacement patterns in non-coding sequences.

Related Experiment Videos

  • Inference of positive selection acting on non-coding DNA.

    • Main Results:

    • A substantial portion of conserved human DNA lies outside protein-coding sequences.
    • At least 1 Mb of this non-coding DNA shows evidence of positive selection.
    • This non-coding fraction represents significant "adaptive dark matter".

    Conclusions:

    • The majority of positively selected sequences are likely located in non-coding DNA.
    • Understanding adaptive dark matter is key to comprehending human evolutionary innovation.
    • Further research into non-coding DNA function is essential for a complete view of genome evolution.