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Related Experiment Videos

Evolutionarily conserved elements in vertebrate, insect, worm, and yeast genomes.

Adam Siepel1, Gill Bejerano, Jakob S Pedersen

  • 1Center for Biomolecular Science and Engineering, University of California, Santa Cruz, Santa Cruz, California 95064, USA. acs@soe.ucsc.edu

Genome Research
|July 19, 2005
PubMed
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Researchers identified conserved genomic elements across species using the phastCons program. These elements, particularly noncoding regions, increase with genome complexity, offering insights into gene regulation and RNA structure.

Area of Science:

  • Comparative genomics
  • Bioinformatics
  • Evolutionary biology

Background:

  • Genomic conservation provides insights into functional elements.
  • Previous studies focused on limited species or element types.

Purpose of the Study:

  • To identify conserved elements across diverse vertebrate and non-vertebrate genomes.
  • To characterize the properties and genomic locations of these conserved elements.

Main Methods:

  • Genome-wide multiple alignments of human, mouse, rat, chicken, Fugu rubripes, Drosophila, Anopheles gambiae, Caenorhabditis, and Saccharomyces.
  • Utilized the phastCons program, a phylogenetic hidden Markov model (phylo-HMM).
  • Maximum likelihood fitting of the phylo-HMM with cross-species calibration.

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Main Results:

  • Conserved elements cover 3%-8% of the human genome and higher percentages in smaller genomes.
  • Increasing fractions of conserved bases are non-exonic in larger, more complex genomes.
  • Highly Conserved Elements (HCEs) are long, overlap regulatory genes, gene deserts, and regions with RNA secondary structure.

Conclusions:

  • Conserved elements, especially noncoding ones, are crucial across species and increase with genomic complexity.
  • HCEs represent a distinct class of conserved sequences with implications for gene regulation and function.
  • The findings highlight the importance of noncoding DNA in evolutionary processes.