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Ancestral Recombination Graphs under Non-Random Ascertainment, with Applications to Gene Mapping

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  • Hössjer Ola

    (Stockholm University)

  • Hartman Linda

    (AstraZeneca)

  • Humphreys Keith

    (Karolinska Institutet)

Abstract

Consider a sample of apparently unrelated individuals, for which marker genotype and phenotype data is available. When individuals are sampled on phenotypes, we propose an ascertained ancestral recombination graph (ARG) that models shared ancestry of the sample chromosomes given phenotype data along a region that possibly harbors a disease susceptibility gene. The ascertained ARG is used to define a gene mapping algorithm by means of a lod score and associated p-values based on permutation testing. Under certain modeling simplifications, the lod score and p-values can be computed exactly, without any Monte Carlo approximations, even for unphased chromosome genotype data. Our method handles incomplete penetrance, varying marker allele frequencies and neutral mutations, and is based on a Hidden Markov algorithm for subsets of disease mutated chromosomes. The performance of the method is investigated in a simulation study and for a real data set from a case-control study of breast cancer.

Suggested Citation

  • Hössjer Ola & Hartman Linda & Humphreys Keith, 2009. "Ancestral Recombination Graphs under Non-Random Ascertainment, with Applications to Gene Mapping," Statistical Applications in Genetics and Molecular Biology, De Gruyter, vol. 8(1), pages 1-44, September.
    • Handle: RePEc:bpj:sagmbi:v:8:y:2009:i:1:n:35
    DOI: 10.2202/1544-6115.1380
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    References listed on IDEAS

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    1. Paul Fearnhead & Peter Donnelly, 2002. "Approximate likelihood methods for estimating local recombination rates," Journal of the Royal Statistical Society Series B, Royal Statistical Society, vol. 64(4), pages 657-680, October.
    2. Matthew Stephens & Peter Donnelly, 2000. "Inference in molecular population genetics," Journal of the Royal Statistical Society Series B, Royal Statistical Society, vol. 62(4), pages 605-635.
    3. Larribe Fabrice & Lessard Sabin, 2008. "A Composite-Conditional-Likelihood Approach for Gene Mapping Based on Linkage Disequilibrium in Windows of Marker Loci," Statistical Applications in Genetics and Molecular Biology, De Gruyter, vol. 7(1), pages 1-33, August.
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    Cited by:

    1. Berg Arthur & He Qiuling & Shen Ye & Chen Ying & Huang Minren & Wu Rongling, 2010. "Trilocus Disequilibrium Analysis of Multiallelic Markers in Outcrossing Populations," Statistical Applications in Genetics and Molecular Biology, De Gruyter, vol. 9(1), pages 1-24, February.

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