A Multi-Marker Model for Detecting Chromosomal Segments Displaying QTL Activity

INVESTIGATIONS

A Multi-Marker Model for Detecting Chromosomal Segments Displaying QTL Activity

F. Rodolphe and M. Lefort
INRA, Centre de Recherches de Jouy en Josas, Laboratoire de Biometrie, 78350 Jouy en Josas, France

A statistical method is presented for detecting quantitative trait loci (QTLs), based on the linear model. Unlike methods able to detect a few well separated QTLs and to estimate their effects and positions, this method considers the genome as a whole and enables the detection of chromosomal segments involved in the differences between two homozygous lines, and their backcross, doubled haploid, or F(2) progenies, for a quantitative trait. Genetic markers must be codominant, but missing markers are accepted, provided they are missing independently from the experiment. Asymptotic properties, which are of practical use, are developed. This method does not rely on strong genetic hypotheses, and thus does not permit any precise genetic analysis of the trait under study, but it does assess which regions of the genome are involved, whatever the complexity of the genetic determinism (number, effects and interactions among QTLs). Simultaneous use of several methods, including this one, should lead to better efficiency in QTL detection.

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