In silico method for inferring genotypes in pedigrees - PubMed (original) (raw)

Comparative Study

doi: 10.1038/ng1863. Epub 2006 Aug 20.

Affiliations

• PMID: 16921375
• PMCID: PMC3005330
• DOI: 10.1038/ng1863

Comparative Study

In silico method for inferring genotypes in pedigrees

Joshua T Burdick et al. Nat Genet. 2006 Sep.

Abstract

Our genotype inference method combines sparse marker data from a linkage scan and high-resolution SNP genotypes for several individuals to infer genotypes for related individuals. We illustrate the method's utility by inferring over 53 million SNP genotypes for 78 children in the Centre d'Etude du Polymorphisme Humain families. The method can be used to obtain high-density genotypes in different family structures, including nuclear families commonly used in complex disease gene mapping studies.

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Figures

Figure 1

Genotype inference. (a) Inferred genotypes for eight SNPs. The inferred genotypes for each child are shown in italics. To determine the inferred genotypes, we identified regions of shared IBD (color-coded) between the child and her parents and grandparents using low-density genotypes (boldface) and used-high density genotypes (light gray) of the grandparents and parents. For illustration purposes, the grandparental genotypes are shown as phased. In practice, this is resolved by an IBD estimation program. (b) Comparison of data from QTDT analysis for four representative expression phenotypes. For each phenotype, results from linkage analysis based on 14 CEPH families (dotted line), QTDT analysis with genotypes for 30 trios from the HapMap Project (gray bars) and with the combined HapMap and inferred genotypes (black bars) are shown. For the linkage analysis, the null hypothesis is no linkage, and for the QTDT, the null hypothesis is no linkage or no association.

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