Genet. Sel. Evol.
Volume 35, Number Suppl. 1, 2003Second International Symposium on Candidate Genes for Animal Health
|Page(s)||S19 - S34|
Application of disease-associated differentially expressed genes - Mining for functional candidate genes for mastitis resistance in cattleManfred Schwerina, Diana Czernek-Schäfera, Tom Goldammera, Srinivas R. Katab, James E. Womackb, Ravi Pareekc, Chandra Pareekc, Krzysztof Walawskic and Ronald M. Brunnera
a Research Unit for Molecular Biology, Research Institute for the Biology of Farm Animals, Dummerstorf, Germany
b Department of Veterinary Pathobiology, Texas A&M University, College Station, TX 77843, USA
c Department of Animal Genetics, University of Warmia and Mazury, Olsztyn, Poland
(Accepted 4 February 2003)
In this study the mRNA differential display method was applied to identify mastitis-associated expressed DNA sequences based on different expression patterns in mammary gland samples of non-infected and infected udder quarters of a cow. In total, 704 different cDNA bands were displayed in both udder samples. Five hundred-and-thirty two bands, (75.6%) were differentially displayed. Ninety prominent cDNA bands were isolated, re-amplified, cloned and sequenced resulting in 87 different sequences. Amongst the 19 expressed sequence tags showing a similarity with previously described genes, the majority of these sequences exhibited homology to protein kinase encoding genes (26.3%), to genes involved in the regulation of gene expression (26.3%), to growth and differentiation factor encoding genes (21.0%) and to immune response or inflammation marker encoding genes (21.0%). These sequences were shown to have mastitis-associated expression in the udder samples of animals with and without clinical mastitis by quantitative RT-PCR. They were mapped physically using a bovine-hamster somatic cell hybrid panel and a 5000 rad bovine whole genome radiation hybrid panel. According to their localization in QTL regions based on an established integrated marker/gene-map and their disease-associated expression, four genes (AHCY, PRKDC, HNRPU, OSTF1) were suggested as potentially involved in mastitis defense.
Key words: mastitis / expressed sequence tag / gene expression / cattle / RH mapping
Correspondence and reprints: Manfred Schwerin
© INRA, EDP Sciences 2003