Abstract
For the detection of polymorphisms within the 5′-flanking region of the β-lactoglobulin (-LG) -encoding gene a nucleotide sequence containing 795 bp of the promoter and 59 bp of exon I was cloned and sequenced. After comparing the sequence from the DNA of 11 diverse cows (different breeds and milk-protein yields), 14 singlebp substitutions were identified within the 5′-flanking region and two in the 5′-untranslated region (5′-UTR) of exon I. Some of the variants are located in potential binding sites for trans-acting factors or in the 5′-UTR. A PCR-based RFLP analysis was performed, and the genotypes of an additional 60 cows were identified at five variable 5′-flanking sites. The results reveal three frequent combinations between the A and B alleles of the protein-coding region and the novel 5′-flanking DNA variants. This finding may explain the differences of the protein-variant-dependent β-LG synthesis (A>B) observed in vivo. A sequence comparison of the bovine and ovine promoters reveals an homology of 92.8% and shows a higher degree of conservation between positions -600 and -300.
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Communicated by E. J. Eisen
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Wagner, V.A., Schild, T.A. & Geldermann, H. DNA variants within the 5′-flanking region of milk-protein-encoding genes II. The β-lactoglobulin-encoding gene. Theoret. Appl. Genetics 89, 121–126 (1994). https://doi.org/10.1007/BF00226993
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DOI: https://doi.org/10.1007/BF00226993