Genetics, Vol. 151, 1605-1619, April 1999, Copyright © 1999

Bayesian Mapping of Multiple Quantitative Trait Loci From Incomplete Outbred Offspring Data

Mikko J. Sillanpääa and Elja Arjasa,b
a Rolf Nevanlinna Institute, FIN-00014 University of Helsinki, Finland
b National Public Health Institute, FIN-00300 Helsinki, Finland

Corresponding author: Mikko J. Sillanpää, Rolf Nevanlinna Institute, Research Institute of Mathematics, Statistics, and Computer Science, P.O. Box 4, FIN-00014 University of Helsinki, Finland., mjs{at}rolf.helsinki.fi (E-mail)

Communicating editor: Z-B. ZENG

A general fine-scale Bayesian quantitative trait locus (QTL) mapping method for outcrossing species is presented. It is suitable for an analysis of complete and incomplete data from experimental designs of F2 families or backcrosses. The amount of genotyping of parents and grandparents is optional, as well as the assumption that the QTL alleles in the crossed lines are fixed. Grandparental origin indicators are used, but without forgetting the original genotype or allelic origin information. The method treats the number of QTL in the analyzed chromosome as a random variable and allows some QTL effects from other chromosomes to be taken into account in a composite interval mapping manner. A block-update of ordered genotypes (haplotypes) of the whole family is sampled once in each marker locus during every round of the Markov Chain Monte Carlo algorithm used in the numerical estimation. As a byproduct, the method gives the posterior distributions for linkage phases in the family and therefore it can also be used as a haplotyping algorithm. The Bayesian method is tested and compared with two frequentist methods using simulated data sets, considering two different parental crosses and three different levels of available parental information. The method is implemented as a software package and is freely available under the name Multimapper/outbred at URL http://www.rni.helsinki.fi/~mjs/.




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