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Invited review: Milk protein polymorphisms in cattle: Effect on animal breeding and human nutrition
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Invited review: Milk protein polymorphisms in cattle: Effect on animal breeding and human nutrition
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Journal Article
Invited review: Milk protein polymorphisms in cattle: Effect on animal breeding and human nutrition
2009
Overview
The 6 main milk proteins in cattle are encoded by highly polymorphic genes characterized by several nonsynonymous and synonymous mutations, with up to 47 protein variants identified. Such an extensive variation was used for linkage analysis with the description of the casein cluster more than 30 yr ago and has been applied to animal breeding for several years. Casein haplotype effects on productive traits have been investigated considering information on the whole casein complex. Moreover, mutations within the noncoding sequences have been shown to affect the specific protein expression and, as a consequence, milk composition and cheesemaking. Milk protein variants are also a useful tool for breed characterization, diversity, and phylogenetic studies. In addition, they are involved in various aspects of human nutrition. First, the occurrence of alleles associated with a reduced content of different caseins might be exploited for the production of milk with particular nutritional qualities; that is, hypoallergenic milk. On the other hand, the frequency of these alleles can be decreased by selection of sires using simple DNA tests, thereby increasing the casein content in milk used for cheesemaking. Furthermore, the biological activity of peptides released from milk protein digestion can be affected by amino acid exchanges or deletions resulting from gene mutations. Finally, the gene-culture coevolution between cattle milk protein genes and human lactase genes, which has been recently highlighted, is impressive proof of the nonrandom occurrence of milk protein genetic variation over the centuries.
Publisher
Elsevier Inc,American Dairy Science Association,Am Dairy Sci Assoc,Elsevier
Subject
/ Animals
/ Biological and medical sciences
/ Breeding
/ Cattle
/ Cheese
/ Fundamental and applied biological sciences. Psychology
/ genetics
/ Genotype
/ Humans
/ Milk
/ Milk and cheese industries. Ice creams
/ Mutation
/ Nutritional Physiological Phenomena
/ Peptides
/ Polymorphism, Genetic - genetics
