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Testing Hardy-Weinberg equilibrium using family data from complex surveys.

Dewei She¹, Hong Zhang, Zhaohai Li

¹Department of Statistics, The George Washington University, 2140 Pennsylvania Avenue N.W., Washington, DC 20052, USA.

Annals of Human Genetics

|June 4, 2009

Summary

Researchers developed new statistical tests to check for Hardy-Weinberg Equilibrium (HWE) in genetic data from complex surveys. The tests confirmed HWE holds for three specific gene loci in the NHANES III dataset using family data.

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Area of Science:

Population Genetics
Statistical Genetics
Human Genetics

Background:

Assessing genetic variation in populations requires understanding deviations from Hardy-Weinberg Equilibrium (HWE).
Complex survey data, like the Third National Health and Nutrition Examination Survey (NHANES III), presents unique challenges for genetic analysis.
Existing methods for HWE testing may not be optimal for family-based data from intricate survey designs.

Purpose of the Study:

To develop and evaluate statistical test procedures for Hardy-Weinberg Equilibrium (HWE) using family data from complex surveys.
To apply these novel tests to genetic loci within the NHANES III dataset.

Main Methods:

Development of six Pearson chi-squared based tests for a diallelic locus in autosomal genes.
Evaluation of test procedure properties using Monte Carlo simulations.
Application of recommended Rao-Scott first-order corrected tests to NHANES III genetic data (ADRB2, TGFB1, VDR) using family trios and extended pedigrees.

Main Results:

Monte Carlo simulations indicated the Rao-Scott first-order corrected test demonstrated favorable finite sample properties.
Application to NHANES III genetic data revealed that Hardy-Weinberg Equilibrium (HWE) was maintained at the 0.05 significance level for the ADRB2, TGFB1, and VDR loci.
These findings were consistent when analyzing families with genotypic data for at least two parents and one child.

Conclusions:

The developed statistical tests are effective for assessing Hardy-Weinberg Equilibrium (HWE) in complex family-based survey data.
The study provides evidence that three specific genetic loci (ADRB2, TGFB1, VDR) are in HWE within the NHANES III population sample, based on family data analysis.
The recommended Rao-Scott corrected test offers a robust approach for HWE testing in similar genetic epidemiology studies.