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Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information

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Complex trait architecture: the pleiotropic model revisited.

T-L North¹, M A Beaumont²

¹MRC-funded PhD student in the Bristol Centre for Systems Biomedicine (BCSBmed) doctoral training centre, Bristol Genetic Epidemiology Laboratories, School of Social and Community Medicine, University of Bristol, Bristol, UK.

Scientific Reports

|March 21, 2015

Summary

This summary is machine-generated.

Rare alleles may explain less genetic heritability than predicted by some models. Our simulations suggest the pleiotropic model overestimates rare allele contributions and predicts unrealistic trait distributions.

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Area of Science:

Genetics
Evolutionary Biology
Quantitative Genetics

Background:

Debate exists on the role of rare alleles in the genetic heritability of complex traits.
This understanding is crucial for designing effective genetic association studies.
Recent theories propose rare alleles might explain a substantial portion of genetic variance via pleiotropic models.

Purpose of the Study:

To evaluate the contribution of rare alleles to genetic heritability using simulations.
To test the predictions of pleiotropic models for trait evolution.
To assess the applicability of standard diffusion results to complex genomic simulations.

Main Methods:

Simulations of whole genomes with overlapping generations in finite populations.
Analysis of variance contribution from rare alleles.
Evaluation of predicted trait distributions under the pleiotropic model.

Main Results:

Standard diffusion results are generally applicable to simulations.
The variance contribution of rare alleles was somewhat smaller than theoretical predictions.
The pleiotropic model often predicted unrealistically leptokurtic trait distributions.

Conclusions:

Rare alleles contribute to genetic heritability, but potentially less than some theories suggest.
The pleiotropic model's assumption of large fitness and trait effects may be limited.
Simulation results provide a more nuanced view of rare allele contributions to complex traits.