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A haplotypic approach to founder-origin probabilities and outbred QTL analysis

Published online by Cambridge University Press:  17 February 2003

M. HUMBERTO REYES-VALDÉS  and
CLAIRE G. WILLIAMS
M. HUMBERTO REYES-VALDÉS
Affiliation:
Departamento de Fitomejoramiento, Universidad Autónoma Agraria Antonio Narro, Buenavista, Saltillo, Coah, Mexico, C.P. 25315
CLAIRE G. WILLIAMS
Affiliation:
Faculty of Genetics, Texas A&M University, College Station, TX 77843-2135, USA
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Abstract

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Founder-origin probability methods are used to trace specific chromosomal segments in individual offspring. A haplotypic method was developed for calculating founder-origin probabilities in three-generation outbred pedigrees suited to quantitative trait locus (QTL) analysis. Estimators for expected founder-origin proportions were derived for a linkage group segment, an entire linkage group and a complete haplotype. If the founders are truly outbred, the haplotypic method gives a close approximation when compared with the Haley et al. (1994) method that simultaneously uses all marker information for QTL analysis, and it is less computationally demanding. The chief limitation of the haplotypic method is that some information in two-allele intercross marker-type configurations is ignored. Informativeness of marker arrays is discussed in the framework of founder-origin probabilities and proportions. The haplotypic method can be extended to more complex pedigrees with additional generations.

Type
Research Article
Information
Genetics Research , Volume 80 , Issue 3 , December 2002 , pp. 231 - 236
Copyright
© 2002 Cambridge University Press