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The complete human olfactory subgenome.

G Glusman1, I Yanai, I Rubin

  • 1Department of Molecular Genetics and the Crown Human Genome Center, The Weizmann Institute of Science, Rehovot 76100, Israel.

Genome Research
|May 5, 2001
PubMed
Summary
This summary is machine-generated.

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Researchers identified over 900 human olfactory receptor genes and pseudogenes (ORs), revealing insights into olfactory receptor evolution and genome expansion. Many ORs are clustered, with fish-like receptors playing a significant role.

Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Olfactory receptors (ORs) represent the largest gene superfamily in vertebrate genomes.
  • Previous understanding of the human olfactory subgenome was incomplete.

Purpose of the Study:

  • To present a comprehensive analysis of the human olfactory subgenome.
  • To identify and characterize olfactory receptor genes and pseudogenes.
  • To investigate the evolutionary history and genomic organization of olfactory receptors.

Main Methods:

  • Gene discovery algorithms were employed to mine the human genome draft.
  • Comparative cluster analysis was utilized to trace OR evolutionary pathways.
  • Identification and annotation of olfactory receptor genes and pseudogenes.

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Main Results:

  • Over 900 human olfactory receptor genes and pseudogenes (ORs) were identified, with two-thirds previously unannotated.
  • Approximately 63% of ORs show signs of pseudogene formation.
  • Olfactory receptors are organized into 17 families, with 'fish-like' Class I ORs constituting 10% of the repertoire and located on chromosome 11.

Conclusions:

  • The human olfactory subgenome is extensive and contains a significant number of pseudogenes.
  • The genomic distribution and clustering of ORs provide insights into their proliferation and diversification.
  • A proposed evolutionary model suggests initial duplication events on chromosome 11, followed by expansion to chromosome 1 and subsequently to other chromosomes.