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Ultraconserved elements in the human genome.

Gill Bejerano1, Michael Pheasant, Igor Makunin

  • 1Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, CA 95064, USA. jill@soe.ucsc.edu

Science (New York, N.Y.)
|May 8, 2004
PubMed
Summary
This summary is machine-generated.

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Researchers identified 481 ultraconserved elements (UCEs) in the human genome, showing high conservation across mammals and vertebrates. These UCEs are crucial for development and may be essential for vertebrate ontogeny.

Area of Science:

  • Genomics
  • Comparative Genomics
  • Evolutionary Biology

Background:

  • Ultraconserved elements (UCEs) are highly conserved DNA sequences across species.
  • Understanding UCEs is crucial for deciphering genome evolution and function.

Purpose of the Study:

  • To identify and characterize ultraconserved elements (UCEs) in the human genome.
  • To investigate the conservation patterns of these elements across different vertebrate species.
  • To explore the genomic locations and potential functions of UCEs.

Main Methods:

  • Comparative genomic analysis of human, rat, mouse, chicken, dog, and fish genomes.
  • Identification of DNA segments with 100% identity across orthologous regions.
  • Analysis of UCE location relative to genes involved in RNA processing, transcription, and development.

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Main Results:

  • Identified 481 segments >200 base pairs (bp) with 100% identity across human, rat, and mouse genomes.
  • These segments show high conservation (95-99% identity) in chicken and dog, and significant conservation in fish.
  • UCEs are frequently located near genes involved in RNA processing, transcription regulation, and development.

Conclusions:

  • UCEs represent a novel class of highly conserved genetic elements in vertebrates.
  • Their conservation levels exceed those of proteins, suggesting critical functional roles.
  • UCEs are likely essential for the ontogeny of mammals and other vertebrates, though their precise functions and evolutionary origins require further investigation.