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The presence of the milk protein, alpha-lactalbumin and its mRNA in the rat epididymis.

alpha-Lactalbumin, a modifier protein that changes the substrate specificity of galactosyltransferase, to promote the synthesis of lactose, is found in the mammary glands of lactating mammals and in milk. Molecules similar to mammary gland alpha-lactalbumin but distinct in their modifier activity have been found in rat epididymal fluid. We report here, using a rat mammary gland alpha-lactalbumin cDNA clone as a hybridization probe, RNA sequences homologous to alpha-lactalbumin mRNA were detected in total RNA from the rat epididymis. This finding suggests that alpha-lactalbumin or similar molecules, in addition to regulating lactose synthesis in the mammary gland, may have other important functions in mammalian reproduction.