Genetics, Vol. 149, 1557-1567, July 1998, Copyright © 1998

Quantitative Trait Locus Mapping in Dairy Cattle by Means of Selective Milk DNA Pooling Using Dinucleotide Microsatellite Markers: Analysis of Milk Protein Percentage

Ehud Lipkina, Mathias O. Mosiga, Ariel Darvasia, Ephraim Ezrab, A. Shaloma, Adam Friedmanna, and Morris Sollera
a Department of Genetics, Alexander Silberman Institute of Life Science, Hebrew University of Jerusalem, Jerusalem 91904, Israel
b Israel Cattle Breeder's Association, Caesaria, Israel

Corresponding author: Ehud Lipkin, Department of Genetics, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel, lipkin{at}vms.huji.ac.il (E-mail).

Communicating editor: Z-B. ZENG

"Selective DNA pooling" accomplishes quantitative trait locus (QTL) mapping through densitometric estimates of marker allele frequencies in pooled DNA samples of phenotypically extreme individuals. With poly(TG) microsatellites, such estimates are confounded by "shadow" ("stutter") bands. A correction procedure was developed on the basis of an observed linear regression between shadow band intensity and allele TG repeat number. Using this procedure, a selective DNA pooling study with respect to milk protein percentage was implemented in Israel-Holstein dairy cattle. Pools were prepared from milk samples of high and low daughters of each of seven sires and genotyped with respect to 11 markers. Highly significant associations with milk protein percentage were found for 5 of the markers; 4 of these markers confirmed previous reports. Selective DNA pooling accessed 80.6 and 48.3%, respectively, of the information that would have been available through individual selective genotyping or total population genotyping. In effect, the statistical power of 45,600 individual genotypings was obtained from 328 pool genotypings. This methodology can make genome-wide mapping of QTL accessible to moderately sized breeding organizations.




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