[No authors listed]
A novel porcine gene, alpha-1-antichymotrypsin 2 (SERPINA3-2), a member of the serpin superfamily, was isolated from a porcine genomic library and sequenced. The genomic organization of the approximately 9.0 kb gene was determined on the basis of the porcine liver cDNA of SERPINA3-1 and SERPINA3-2, and comprises five exons and four introns. The coding sequence of SERPINA3-2 shares 86% identity with the paralogue, SERPINA3-1. Porcine SERPINA3-2 was found to be an orthologue of human SERPINA3 (71% identity of the coding sequences) and both genes have a similar genomic organization. Polymorphisms were found in intron 4 of the porcine gene using polymerase chain reaction-restriction fragment length polymorphism. The gene was mapped by linkage analysis and radiation hybrid mapping to the distal end of chromosome 7q, to the gene cluster of the protease inhibitors including PI1 (SERPINA1), PI2, PI3, PI4 (apparently paralogues of SERPINA3), and PO1A and PO1B. SERPINA3-2 is the first porcine serpin gene whose genomic organization has been determined.
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