| 摘要 |
Particular aspects provide novel recombinant cells and cell lines (e.g., macrophage cell lines) that are permissive for propagation of porcine reproductive and respiratory syndrome virus (PRRSV) propagation in vitro or in vivo. In certain aspects, novel nucleic acid sequences encoding porcine sialoadhesin were transfected into existing macrophage cell-lines from other species, rendering them permissive to PRRSV infection, and suitable for propagation of PRRSV. Particular aspects provide exemplary recombinant cloned cell lines that support the replication of PRRSV, with an obtainable PRRSV titre of between 2×105/ml and 2×106/ml. Additional aspects provide novel nucleic acid sequences and polymorphisms thereof that encode for porcine sialoadhesin. Further aspects provide PRRSV propagation and preparation methods using the novel recombinant cell lines, and methods for PRRSV antigen and vaccine production using same. Yet further aspect provide transgenic, chimerical or engrafted animals having cell comprising nucleic acid sequences encoding porcine sialoadhesin.
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