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The Journal of Heredity 2001:92(3)
© 2001 The American Genetic Association 92:243-247

The Aunt and Uncle Effect: An Empirical Evaluation of the Confounding Influence of Full Sibs of Parents on Pedigree Reconstruction

J. B. Olsen, C. Busack, J. Britt, and P. Bentzen

From the Gene Conservation Laboratory, Alaska Department of Fish and Game, 333 Raspberry Rd., Anchorage, AK, 99518-1599 (Olsen), Marine Molecular Biotechnology Laboratory, University of Washington, Seattle, Washington (Olsen, Britt, and Bentzen), and Washington Department of Fish and Wildlife, Olympia, Washington (Busack). J. Britt is currently at the Department of Biology, University of Oregon, Eugene, Oregon.

Address correspondence to Jeffrey B. Olsen at the address above or e-mail: jeff_olsen{at}fishgame.state.ak.us.

This study used simulations and a known two-generation pedigree of chinook salmon (Oncorhynchus tshawytscha) to evaluate the effect of full sibs of parents on pedigree reconstruction. Parentage analysis was conducted on 100 parent pair-offspring relationships from pedigrees with unrelated (simulation) and related (chinook salmon) candidate parents. Parentage assignment success for the chinook salmon was lower than in the simulated populations. For example, the six most variable loci (mean HE = 0.87) provided a mean of 97% unambiguous assignments in the simulated population and 67% unambiguous assignments for the chinook salmon. Estimates of the pairwise relatedness coefficient (xy) for most nonexcluded false parents and true parents of chinook salmon offspring exceeded 0.50. These results support the conclusion that closely related candidate parents decrease the power of genetic markers for pedigree reconstruction based on exclusion. Ambiguous parentage may be resolved using single parent- and parent pair-offspring likelihood analysis, however, these methods should be used with caution and they are not replacements for using more loci when many candidate parents are full sibs.


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