Evaluating the Common Disease-Common Variant Hypothesis
Author Information
Author(s): Chen Gary K, Jorgenson Eric, Witte John S
Primary Institution: University of California, San Francisco
Hypothesis
Do genetic variants associated with a phenotype differ depending on whether they are within or outside of regions linked to the phenotype?
Conclusion
The study found no statistically significant differences in allele frequencies or effect sizes between SNPs within and outside linkage regions.
Supporting Evidence
- Linkage analyses were effective for identifying traits with simple Mendelian inheritance patterns.
- Genome-wide association studies may be better for detecting common variants of modest effects.
- The study evaluated 3550 phenotypes and found 227 associated SNPs.
- Power calculations indicated limited ability to detect small effects due to the small sample size.
- Allele frequencies did not differ significantly between SNPs inside and outside linkage regions.
Takeaway
The researchers wanted to see if genetic changes linked to diseases were different based on their location in the genome, but they didn't find any big differences.
Methodology
The study used genome-wide linkage and association analyses on gene expression phenotypes and SNP genotypes from a specific dataset.
Limitations
The small sample size limited the power to detect differences in allele frequencies and effect sizes.
Participant Demographics
The study involved 194 individuals from 14 CEPH families.
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