Background
Recently, score statistics have been proposed for mapping
quantitative trait loci (QTLs) using sibship data or general
pedigree data [1-4]. These score statistics are straightforward
to compute. These works focus mainly on the development
of the methodology. In this report, we apply a
score statistic to sibship data derived from the randomly
selected Replicate 34 of the simulated data provided by
the Genetic Analysis Workshop 13 (GAW13).
The statistic to be used is the one in Wang and Huang [2]
that assumes no locus-specific dominance effect. Using a
parameterization first introduced by Tang and Siegmund
[1], Wang [4] introduced two score statistics to detect
QTLs with general pedigrees. One assumes no locus-specific
dominance effect and the other one does not. Since
the approach in Wang [4] is more general, and since, for
sibship data, the two statistics in Wang and Huang [2] and
Wang [4] that assume no locus-specific dominance effect
are equivalent, we first briefly describe the statistic in
Wang [4]. A genome scan was conducted using this statistic.
For this purpose, an add-on R program to GENEHUNTER
was developed. This R program is freely
available.