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The human olfactory subgenome: from sequence to structure and evolution.

T Fuchs1, G Glusman, S Horn-Saban

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

Human Genetics
|February 24, 2001
PubMed
Summary
This summary is machine-generated.

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Olfactory receptors (ORs), the largest gene family, are crucial for detecting diverse odors. This study analyzes 224 human OR genes, revealing insights into their evolution and structure.

Area of Science:

  • Genomics
  • Evolutionary Biology
  • Biochemistry

Background:

  • Olfactory receptors (ORs) form the largest multigene family in multicellular organisms.
  • Their expansion is driven by the need to recognize millions of odorants.
  • Human genome sequencing offers insights into the olfactory subgenome.

Purpose of the Study:

  • To systematically analyze a large set of human olfactory receptor genes.
  • To understand the evolutionary origins and structural characteristics of human ORs.
  • To provide a comprehensive resource for human OR sequence analysis.

Main Methods:

  • Literature survey and data mining across 14 genomic clusters.
  • OR-targeted experimental sequencing strategy.
  • Analysis of 224 human OR genes, including pseudogene identification.

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Main Results:

  • The analyzed set comprises at least 53% pseudogenes and 11 gene families.
  • One gene family (no. 7) shows significant expansion in primates.
  • Insights into the graded expansion of OR genes throughout mammalian evolution.
  • Delineation of a structural map for human OR proteins.

Conclusions:

  • Human OR gene repertoire reflects evolutionary pressures for odorant recognition.
  • The study provides a foundational analysis of the human olfactory subgenome.
  • A publicly available database (HORDE) facilitates further genome-wide OR research.