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Are rare variants responsible for susceptibility to complex diseases?
1Department of Statistics, University of Oxford, 1 South Parks Road, Oxford OX1-3TG, United Kingdom. pritch@stats.ox.ac.uk
American Journal of Human Genetics
|June 19, 2001
Summary
Genetic variation in complex diseases is often due to mildly deleterious mutations with high mutation rates, not old, high-frequency alleles. This suggests a need to reconsider gene mapping strategies for common human diseases.
Area of Science:
- Human genetics
- Evolutionary biology
- Disease genetics
Background:
- Understanding the genetic basis of complex human diseases is challenging.
- Current models often assume weak or negligible selection against disease-related mutations.
Purpose of the Study:
- To propose an explicit evolutionary model for complex disease loci.
- To investigate the role of mutation, genetic drift, and purifying selection.
- To evaluate the frequency and nature of susceptibility alleles.
Main Methods:
- Development of an explicit evolutionary model.
- Incorporation of mutation, random genetic drift, and purifying selection.
- Analysis of allele frequencies and genetic variance.
Main Results:
- Neutral susceptibility alleles are unlikely to be at intermediate frequencies.
- Mildly deleterious mutations with high mutation rates likely contribute most genetic variance.
- High allelic heterogeneity is probable at disease loci.
Conclusions:
- The prevailing view of old, high-frequency susceptibility mutations may be incorrect.
- Mildly deleterious alleles and high mutation rates are key factors in complex disease genetics.
- Gene mapping strategies may need re-evaluation based on these findings.