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Cloning of the goat beta-casein-encoding gene and expression in transgenic mice.

The goat beta-casein-encoding gene (CSN2), which encodes the most abundant protein of goat milk, has been cloned and sequenced. The intron/exon organization of the 9.0-kb goat CSN2 gene is similar to that of other CSN2 genes. Expression of the goat gene was principally restricted to the mammary gland of lactating transgenic animals. A low level of expression was also observed in skeletal muscle and skin. In contrast to a rat CSN2 transgene [Lee et al., Nucleic Acids Res. 16 (1988) 1027-1041], the goat gene was expressed to a high degree in the lactating mammary gland. Differences in the content or context of regulatory elements may account for the enhanced performance of the goat relative to the rat CSN2 gene in transgenic mice.