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    Anim Genet. 2000 Feb;31(1):49-51.

    Biochemical, molecular and physiological characterization of a new beta-casein variant detected in Korean cattle.

    Han SK, Shin YC, Byun HD.

    Department of Dairy Science, College of Animal Husbandry, Kon-Kuk University, Seoul, Korea.

    There are seven known genetic variants of bovine beta-casein (beta-CN)--A1, A2, A3, B, C, D and E. In this study, we identified a new genetic variant (named beta-CN H) which migrates slower than the other variants in acidic starch gel electrophoresis. We confirmed through protein and DNA sequence analyses that the H variant differs at five residues from the A2 sequence: Arg25/Cys, Leu88/Ile, Gln117/Glu, Glu175/Gln and Gln195/Glu. Of these substitutions the 25th residue was contained in the casein phosphopeptide (CPP) region. In rats, calcium solubilizing effect of the CPP of bovine variant H was increased by approximately 23% compared with that of the CPP of non-H. Using extensive Korean Bos taurus pedigrees, we confirmed that beta-CN H was controlled by a codominant allele.

    PMID: 10690361 [PubMed - indexed for MEDLINE]

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