Mutations in the genome of porcine reproductive and respiratory syndrome virus responsible for the attenuation phenotype.

Mutations in the genome of porcine reproductive and respiratory syndrome virus responsible for the attenuation phenotype.
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DOI:
10.1007/s007050070115
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发表时间:
2000
影响因子:
2.7
通讯作者:
Osorio FA
Osorio FA
中科院分区:
医学4区
文献类型:
--
作者:
Allende R;Kutish GF;Laegreid W;Lu Z;Lewis TL;Rock DL;Friesen J;Galeota JA;Doster AR;Osorio FA

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 虽然减毒活疫苗已用于控制猪繁殖与呼吸综合征(PRRS)的临床症状有一段时间了,但减毒表型的分子基础仍不清楚。我们先前已经确定了致病性PRRSV 16244 B的基因组序列。减毒疫苗株的结构蛋白编码序列的有限比较显示与致病性16244 B具有98%的同源性。在这里,我们已经证实了减毒的表型,并确定了减毒的PRRSV疫苗的基因组序列,并将其与其亲本VR-2332和16244 B株进行了比较。减毒疫苗序列与16244 B株序列共线性,在15,374个核苷酸序列中不含空位和212个取代。我们鉴定了分布在Nsp 1 β、Nsp 2、Nsp 10、ORF 2、ORF 3、ORF 5和ORF 6中的9个氨基酸变化。这些变化可能为观察到的减毒表型提供了分子基础。
 Although live-attenuated vaccines have been used for some time to control clinical symptoms of the porcine reproductive and respiratory syndrome (PRRS), the molecular bases for the attenuated phenotype remain unclear. We had previously determined the genomic sequence of the pathogenic PRRSV 16244B. Limited comparisons of the structural protein coding sequence of an attenuated vaccine strain have shown 98% homology to the pathogenic 16244B. Here we have confirmed the attenuated phenotype and determined the genomic sequence of that attenuated PRRSV vaccine and compared it to its parental VR-2332 and the 16244B strains. The attenuated vaccine sequence was colinear with that of the strain 16244B sequence containing no gaps and 212 substitutions over 15,374 determined nucleotide sequence. We identified nine amino acid changes distributed in Nsp1β, Nsp2, Nsp10, ORF2, ORF3, ORF5 and ORF6. These changes may provide the molecular bases for the observed attenuated phenotype.
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