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2019-11-08Zeitschriftenartikel DOI: 10.18452/21199
DNA Sequence Variants and Protein Haplotypes of Casein Genes in German Black Pied Cattle (DSN)
Meier, Saskia
Korkuć, Paula
Arends, Danny cc
Brockmann, Gudrun A cc
Lebenswissenschaftliche Fakultät
Casein proteins were repeatedly examined for protein polymorphisms and frequencies in diverse cattle breeds. The occurrence of casein variants in Holstein Friesian, the leading dairy breed worldwide, is well known. The frequencies of different casein variants in Holstein are likely affected by selection for high milk yield. Compared to Holstein, only little is known about casein variants and their frequencies in German Black Pied cattle (“Deutsches Schwarzbuntes Niederungsrind,” DSN). The DSN population was a main genetic contributor to the current high-yielding Holstein population. The goal of this study was to investigate casein (protein) variants and casein haplotypes in DSN based on the DNA sequence level and to compare these with data from Holstein and other breeds. In the investigated DSN population, we found no variation in the alpha-casein genes CSN1S1 and CSN1S2 and detected only the CSN1S1*B and CSN1S2*A protein variants. For CSN2 and CSN3 genes, non-synonymous single nucleotide polymorphisms leading to three different β and κ protein variants were found, respectively. For β-casein protein variants A1, A2, and I were detected, with CSN2*A1 (82.7%) showing the highest frequency. For κ-casein protein variants A, B, and E were detected in DSN, with the highest frequency of CSN3*A (83.3%). Accordingly, the casein protein haplotype CSN1S1*B-CSN2*A1-CSN1S2*A-CSN3*A (order of genes on BTA6) is the most frequent haplotype in DSN cattle.
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This article was supported by the German Research Foundation (DFG) and the Open Access Publication Fund of Humboldt-Universität zu Berlin.
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DOI
10.18452/21199
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https://doi.org/10.18452/21199
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