Estimating the Frequency of Nonpaternity in SwitzerlandSasse G.a · Müller H.a · Chakraborty R.b · Ott J.c
aRG Human Genetics, Department of Research, University Clinics, Kantonsspital, University of Basel, Switzerland; bCenter for Demographic and Population Genetics, University of Texas, Houston, Tex., and Department of Genetics and Development and cDepartment of Psychiatry, Columbia University, New York, N.Y., USA
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In linkage analysis and gene mapping in general, typing error and/or errors in specifying pedigree relationships between individuals typically lead to an upwards bias in recombination fraction estimates and to a loss of power for detecting linkage. [Ott J: Analysis of Human Genetic Linkage. Baltimore, Johns Hopkins University Press, 1991]. The presence of nonpaternity is the most common source of error of misspecification of pedigree relationships between individuals that can have a negative impact on pedigree analysis. We have developed estimates of underlying nonpaternity probabilities based on observed Mendelian inconsistencies. The methods were applied to a sample of 1,607 children and their parents. Genetic marker data were investigated to test for exclusions due to nonpaternity. Among the 1,607 children, 11 or 0.68% exclusions were found. When a constant nonpaternity rate was assumed for each child, its maximum likelihood estimate turned out to be 0.78% with asymptotic 95% confidence limits of 0.41% and 1.35%. When varying nonpaternity rates were assumed, its mean was estimated as 0.83% with asymptotic 95% confidence limits of 0.32% and 1.33%.
© 1994 S. Karger AG, Basel
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