The present invention relates to a novel chimeric nucleic acid molecule of porcine circovirus (PCV2Gen-1Rep) that embraces a nucleic acid molecule encoding porcine circovirus type 2 (PCV2) which contains a nucleic acid sequence encoding a Rep protein of porcine circovirus type 1 (PCV1), particularly wherein the nucleic acid sequence encoding the Rep protein of PCV1 is an open reading frame (ORF) gene and, more particularly, wherein the ORF Rep gene is ORF1. A highly desirable chimeric nucleic acid molecule is constructed by replacing the ORF1 Rep gene of PCV2 by the ORF1 Rep gene of PCV1. The invention also encompasses the biologically functional plasmid or viral vector containing the unique chimeric nucleic acid molecules, suitable host cells transfected by the plasmid or vector, infectious chimeric porcine circoviruses that are produced by the suitable host cells, the process for the production of an immunogenic polypeptide product making use of the new chimera, viral vaccines that protect a pig against viral infection or postweaning multisystemic wasting syndrome (PMWS) caused by PCV2, methods of protecting a pig against viral infection or postweaning multisystemic wasting syndrome (PMWS) caused by PCV2, methods of preparing the unique chimera of PCV2Gen-1Rep and the like. This invention further includes a new method for improving the replication and titer of PCV2 in a cell culture.Изобретение относится к химерной молекуле нуклеиновой кислоты цирковируса свиней (PCV2Gen-1Rep), содержащей молекулу нуклеиновой кислоты, кодирующую цирковирус свиней типа 2 (PCV2), и последовательность нуклеиновой кислоты, кодирующей Rep белок цирковируса свиней типа 1 (PCV1), где ORF Rep ген представлен ORF1. Химерная молекула нуклеиновой кислоты сконструирована путем замещения ORF1 Rep гена PCV2 на ORF1 Rep ген PCV1. Изобретение также относится к биологически функциональной плазмиде или вирусному вектору, содержащему уникальные химерные молекулы нуклеиновой кислоты, к пригодной клет
