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Ancient duplicated conserved noncoding elements in vertebrates: a genomic and functional analysis.

Gayle K McEwen1, Adam Woolfe, Debbie Goode

  • 1School of Biological and Chemical Sciences, Queen Mary, University of London, London E1 4NS, United Kingdom.

Genome Research
|March 15, 2006
PubMed
Summary
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Researchers identified 124 families of duplicated conserved noncoding elements in the human genome. These elements, crucial for gene regulation during development, suggest gene and regulatory element duplication contributed to vertebrate evolution.

Area of Science:

  • Comparative genomics
  • Evolutionary biology
  • Developmental biology

Background:

  • Fish-mammal genomic comparisons identify conserved noncoding elements.
  • These elements are often cis-regulatory, acting as tissue-specific enhancers.
  • Some conserved elements are duplicated, suggesting evolutionary significance.

Purpose of the Study:

  • To identify duplicated conserved noncoding elements in the human genome.
  • To investigate the evolutionary origins and functions of these duplicated elements.
  • To link duplicated elements to specific paralogous genes involved in development.

Main Methods:

  • Human genome comparison with Fugu (pufferfish) to identify conserved noncoding sequences.
  • Analysis of sequence identity and conservation across vertebrate genomes.

Related Experiment Videos

  • Reporter gene assays to test enhancer activity of duplicated elements.
  • Assignment of paralogous genes to duplicated element families.

    • Main Results:

    • Identified 124 families of duplicated conserved noncoding elements (2-5 members each).
    • 74% of families linked to paralogous genes involved in transcriptional regulation and development.
    • Duplicate elements show tissue-specific enhancer activity, with overlapping expression domains.
    • Over two-thirds of families are conserved in duplicate in fish, predating vertebrate origins.

    Conclusions:

    • Duplicated conserved noncoding elements are prevalent and ancient.
    • Gene and cis-regulatory element duplication likely played a role in vertebrate evolution and morphological diversity.
    • These findings provide a model for understanding the co-evolution of genes and regulatory elements.