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Structure-based comparison of four eukaryotic genomes.

Melissa Cline1, Guoying Liu, Ann E Loraine

  • 1Affymetrix, Inc., 6550 Vallejo Street, Emeryville, CA 94608, USA. melissa_cline@affymetrix.com

Pacific Symposium on Biocomputing. Pacific Symposium on Biocomputing
|April 4, 2002
PubMed
Summary

Comparative genomics reveals distinct structural domains across species. Humans possess unique domains for immune response and signaling, while yeast lacks these, highlighting evolutionary differences.

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Area of Science:

  • Genomics
  • Structural Biology
  • Bioinformatics

Background:

  • Comparative genomics aids in understanding organismal molecular machinery by contrasting genomes.
  • Previous studies utilized sequence-based homology (Pfam, Interpro) for domain analysis.
  • A structure-based approach offers a complementary perspective on genomic architecture.

Purpose of the Study:

  • To perform a structure-based comparative genomic analysis of Homo sapiens, C. elegans, Drosophila melanogaster, and S. cerevisiae.
  • To identify and contrast structural domains present in these diverse organisms using the SCOP database.
  • To elucidate evolutionary differences in domain composition related to specific biological functions.

Main Methods:

  • Genome-wide structural domain analysis.

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  • Utilizing the SCOP (Structural Classification of Proteins) database for domain identification.
  • Comparative analysis of domain repertoires across human, nematode, fruit fly, and yeast genomes.

    • Main Results:

    • The human genome exhibits unique structural domains associated with signal transduction, immune response, transport, and specific enzymes compared to other eukaryotes.
    • The yeast genome (S. cerevisiae) lacks domains crucial for immune response, cell-cell interactions, and cell signaling when compared to metazoan genomes (human, C. elegans, D. melanogaster).
    • This structure-based comparison highlights significant differences in the functional capabilities encoded within these genomes.

    Conclusions:

    • Structural domain analysis provides novel insights into evolutionary divergence and functional specialization.
    • Human-specific domains underscore the complexity of higher eukaryotic systems, particularly in immunity and signaling.
    • The absence of certain domains in yeast reflects its distinct evolutionary path and unicellular lifestyle.