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Identification and characterization of coding single-nucleotide polymorphisms within a human olfactory receptor gene
1Department of Molecular Genetics, The Weizmann Institute of Science, 76100, Rehovot, Israel.
Gene
|January 4, 2001
Summary
Olfactory receptor (OR) genes show high genetic diversity, twice that of other G-protein coupled receptors (GPCRs). This suggests positive selection and varying recombination rates within the OR gene cluster.
Area of Science:
- Genetics
- Molecular Biology
- Human Genomics
Background:
- Olfactory receptors (ORs) are G-protein coupled receptors (GPCRs) crucial for smell.
- Understanding genetic variation in ORs is key to olfactory function and evolution.
Purpose of the Study:
- To investigate single-nucleotide polymorphisms (SNPs) in human OR coding and noncoding regions.
- To compare genetic diversity of ORs with other GPCRs.
- To analyze linkage disequilibrium (LD) and recombination patterns within an OR gene cluster.
Main Methods:
- Sequencing of 15 OR coding regions, one control, and two noncoding sequences on chromosome 17p13.3.
- Identification and characterization of SNPs, including coding SNPs (cSNPs).
- Genotyping of 85 individuals to assess LD and recombination hotspots.
Main Results:
- Identified 26 SNPs in ORs, 21 being cSNPs.
- OR coding regions exhibited higher nucleotide diversity (0.078%) than other GPCRs.
- Observed LD in the centromeric region and lack of LD in the telomeric region of the OR cluster, indicating recombination hotspots.
Conclusions:
- High OR polymorphism may result from weak positive selection.
- Gene conversion events could explain shared cSNPs.
- Differential recombination rates across the OR gene cluster influence genetic diversity patterns.