Testing for Hardy-Weinberg Equilibrium in Samples with Related Individuals

Overview

Journal Genetics

Publisher Oxford University Press

Specialty Genetics

Date 2004 Sep 17

PMID 15371359

Citations 28

Authors

Catherine Bourgain

Mark Abney

Daniel Schneider

Carole Ober

Mary Sara McPeek

Affiliations

Soon will be listed here.

Abstract

When the classical chi(2) goodness-of-fit test for Hardy-Weinberg (HW) equilibrium is used on samples with related individuals, the type I error can be greatly inflated. In particular the test is inappropriate in population isolates where the individuals are related through multiple lines of descent. In this article, we propose a new test for HW (the QL-HW test) suitable for any sample with related individuals, including large inbred pedigrees, provided that their genealogy is known. Performed conditional on the pedigree structure, the QL-HW test detects departures from HW that are not due to the genealogy. Because the computation of the QL-HW test becomes intractable for very polymorphic loci in large inbred pedigrees, a simpler alternative, the GCC-HW test, is also proposed. The statistical properties of the QL-HW and GCC-HW tests are studied through simulations considering a sample of independent nuclear families, a sample of extended outbred genealogies, and samples from the Hutterite population, a North American highly inbred isolate. Finally, the method is used to test a set of 143 biallelic markers spanning 82 genes in this latter population.

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