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On the Number of Siblings and p-th Cousins in a Large Population Sample

View ORCID ProfileVladimir Shchur, View ORCID ProfileRasmus Nielsen
doi: https://doi.org/10.1101/145599
Vladimir Shchur
1Department of Integrative Biology, University of California Berkeley 4098 Valley Life Sciences Building (VLSB) Berkeley, CA 94720-3140
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Rasmus Nielsen
1Department of Integrative Biology, University of California Berkeley 4098 Valley Life Sciences Building (VLSB) Berkeley, CA 94720-3140
2Museum of Natural History, University of Copenhagen, Øster Voldgade 5-7, 1350 København K, Denmark
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1. Abstract

The number of individuals in a random sample with close relatives in the sample is a quantity of interest when designing Genome Wide Association Studies (GWAS) and other cohort based genetic, and non-genetic, studies. In this paper, we develop expressions for the distribution and expectation of the number of p-th cousins in a sample from a population of size N under two diploid Wright-Fisher models. We also develop simple asymptotic expressions for large values of N. For example, the expected proportion of individuals with at least one p-th cousin in a sample of K individuals, for a diploid dioecious Wright-Fisher model, is approximately 1 − e−(22p−1)K/N. Our results show that a substantial fraction of individuals in the sample will have at least a second cousin if the sampling fraction (K/N) is on the order of 10−2. This confirms that, for large cohort samples, relatedness among individuals cannot easily be ignored.

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Posted May 03, 2018.
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On the Number of Siblings and p-th Cousins in a Large Population Sample
Vladimir Shchur, Rasmus Nielsen
bioRxiv 145599; doi: https://doi.org/10.1101/145599
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On the Number of Siblings and p-th Cousins in a Large Population Sample
Vladimir Shchur, Rasmus Nielsen
bioRxiv 145599; doi: https://doi.org/10.1101/145599

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