Abstract
Five new antigenic markers (allotypes) of swine serum lipoproteins are described. Specific antiallotype reagents were obtained from alloimmune precipitating sera. Identification studies and genetic analysis indicate that the five serum alloantigens—designated Lpp6, Lpp11, Lpp12, Lpp13, and Lpp14—are markers of low-density lipoproteins (LDL),d 1.002–1.075 g/ml, and are members of a previously described Lpp system. The Lpp6 allotype belongs to the group of individual markers and is determined by a new codominant allelic gene,Lpp 6, whereas the remaining four antigens—Lpp11, Lpp12, Lpp13, and Lpp 14—named common specificities, behave as alternative variants to Lpp1, Lpp2, Lpp3, and Lpp4, respectively, forming pairs of mutually exclusive alloantigens. Each Lpp gene in a heterozygous animal expresses itself independently on separate molecules and each haplotype carries one individual and at least four common specificities. The relationship between common and individual specificities, together with their number in the complex haplotypes, seems to shed some light on evolution of Lpp genes. It is proposed in this concept that the original gene for low-density lipoproteins in swine, and also in rhesus monkeys and the human, consisted of genetic information for common specificities only, the individual specificities evolving later as a result of point mutations.
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Rapacz, J., Hasler-Rapacz, J. & Kuo, W.H. Immunogenetic polymorphism of lipoproteins in swine. Immunogenetics 6, 405–424 (1978). https://doi.org/10.1007/BF01563933
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DOI: https://doi.org/10.1007/BF01563933