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Serial segmental duplications during primate evolution result in complex human genome architecture.

Pawełl Stankiewicz1, Christine J Shaw, Marjorie Withers

  • 1Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA.

Genome Research
|November 3, 2004
PubMed
Summary

Human genome evolution involved complex low-copy repeats (LCRs) or segmental duplications, shaping primate genomes. These duplications created new genes, potentially driving primate evolution and human brain development.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Comparative Genomics

Background:

  • The human genome contains a high proportion of low-copy repeats (LCRs), also known as segmental duplications, distinguishing it from other mammals.
  • The evolutionary mechanisms and reasons behind the complex architecture formed by these LCRs are not fully understood.

Purpose of the Study:

  • To analyze the structure and evolution of LCRs in human and primate genomes, focusing on regions with complex architecture.
  • To investigate the role of LCRs in shaping the human genome, particularly in proximal 17p.
  • To understand the timeline and mechanisms of LCR evolution during primate diversification.

Main Methods:

  • Molecular and computational analyses of human and primate genomic regions.
  • Examination of LCR structures and their evolutionary timing.

Related Experiment Videos

  • Investigation of gene conversion and transposable elements at LCR breakpoints.

    • Main Results:

    • Multiple LCRs of distinct origins are found adjacent to each other, with evolutionary changes occurring at different times between >25 and 3-7 million years ago.
    • Evidence suggests gene conversion between LCRs during primate evolution.
    • Transposable elements (MER1-Charlie3 and ERVL) were identified at translocation breakpoints, indicating a role in genome evolution.
    • Recent LCR events have generated novel genes expressed in the human brain.

    Conclusions:

    • A series of sequential segmental duplication events have created complex genome architecture in primates, particularly in proximal 17p.
    • These duplications may have driven primate evolution by generating novel fusion/fission genes and facilitating gene divergence through genomic inversions.