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    • IJAFR volume 47, 2008
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    A note on the evaluation of a beta-casein variant in bovine breeds by allele-specific PCR and relevance to β-casomorphin

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    Author
    Keating, A.F.
    Smith, T.J.
    Ross, R Paul
    Cairns, M.T.
    Keyword
    Allele-specific PCR
    β-casein
    Bioactive peptides
    Date
    2008
    
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    URI
    http://hdl.handle.net/11019/632
    Citation
    A.F. Keating, T.J. Smith, R.P. Ross and M.T. Cairns. A note on the evaluation of a beta-casein variant in bovine breeds by allele-specific PCR and relevance to β-casomorphin. Irish Journal of Agricultural and Food Research 47: 99–104, 2008
    Abstract
    Two genetic variants of the bovine β-casein gene (A1 and B) encode a histidine residue at codon 67, resulting in potential liberation of a bioactive peptide, β-casomorphin, upon digestion. An allele-specific PCR (AS-PCR) was evaluated to distinguish between the β-casomorphin-releasing variants (A1 and B) and the non-releasing variants. AS-PCR successfully distinguished β-casein variants in 41 of 42 animals as confirmed by sequence analysis. Overall, while the incidence of the homozygous A1 and B animals (i.e., homozygous for the histidine residue; 21.4%) was lower than that for animals without the histidine residue (30.9% respectively), 69% of animals carried at least one allele for the histidine residue at codon 67.
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    IJAFR volume 47, 2008

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