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Considerable haplotype diversity within the 23kb encompassing the ADH7 gene
Yi Han1, Hiroki Oota, Michael V Osier
1Department of Genetics, Yale University, School of Medicine, New Haven, CT 06520-8005, USA.
Alcoholism, Clinical and Experimental Research
|December 31, 2005
Summary
The alcohol dehydrogenase 7 (ADH7) gene shows high haplotype diversity due to recombination, suggesting it acts independently of ADH1B in alcoholism association studies.
Area of Science:
- Genetics
- Pharmacogenomics
- Human Evolution
Background:
- The ADH7 gene encodes an enzyme with high ethanol-metabolizing activity.
- Previous research suggested ADH7 plays a role in alcoholism protection via a single nucleotide polymorphism (SNP).
Purpose of the Study:
- To investigate the genetic structure and linkage disequilibrium (LD) across the ADH7 gene.
- To clarify the potential for ADH7 to be in linkage disequilibrium with other genes associated with alcoholism.
Main Methods:
- Analysis of seven single nucleotide polymorphisms (SNPs) across 23 kb of the ADH7 gene.
- Study of 38 diverse global populations to assess haplotype diversity and LD.
Main Results:
- Moderate to strong LD was observed across the ADH7 region, with high haplotype diversity.
- A distinct pattern emerged with high LD within upstream and downstream SNP groups, but low LD between them.
- Four major haplotypes explained most chromosomes within each group.
Conclusions:
- Low LD between the two halves of the ADH7 region indicates significant recombination, particularly in intron 7.
- The lack of strong LD between ADH7 variations and ADH1B functional variations supports ADH7's genetic independence.
- The previously observed epistatic effect of ADH7 is not due to linkage with ADH1B.