Abstract
Plasma samples of 1126 dogs belonging to 21 different European breeds were analysed by two-dimensional agarose gel (pH 5.4 or pH 8.6)--horizontal polyacrylamide gel (pH 9.0) electrophoresis, followed by general-protein staining of gels. Genetic polymorphism was detected for five as yet unidentified proteins designated pretransferrin-1 and -2 (Prt1 and Prt2) and postalbumin-1, -2 and -3 (Pa1, Pa2 and Pa3). Three alleles are reported in the Prt1 and Prt2 systems and two alleles in the Prt2, Pa1 and Pa3 systems. While Prt2 variation was observed only in the cocker spaniel breed, each of the other four proteins showed a high degree of polymorphism in most of the breeds studied. Pa3 fractions were clearly observed only in samples stored at -20 degrees C for more than 2 years. Prt1, Pa1 and Pa2 proteins are additional useful markers for parentage control in dogs. This study corroborated previously published results that dog plasma proteins, in general, show considerably more polymorphism than that reported for haemoglobin and for several blood cell enzymes in this species.
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