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1 result(s) for "A91S突变"
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大熊猫源猫泛白细胞减少症病毒VP2基因的测序及遗传进化分析
为探究大熊猫源猫泛白细胞减少症病毒(Feline panleukopenia virus, FPV)流行毒株的分子流行特征,本研究对一例腹泻大熊猫(Ailuropoda melanoleuca)粪便样本进行检测。通过PCR成功扩增并测定了FPV VP2基因全长序列(命名为Giant panda/AB/2025)。遗传进化分析显示,该毒株属于FPV G1基因型,与FPV参考毒株核苷酸同源性为99.2%~99.9%,与研究团队2018年分离的大熊猫源FPV株同源性可达99.4%。关键氨基酸位点分析发现,决定宿主特异性的位点(80、93、103、323、564和568)均与典型FPV一致,但其91位氨基酸由A突变为S(A91S)。蛋白3D结构模型预测显示,A91S突变导致VP2蛋白表面Loop区局部构象改变。结果表明,我国部分地区的大熊猫种群中已存在携带A91S突变的FPV变异株感染,需加强持续监测。本研究结果为大熊猫FPV的流行病学和疫苗研发提供了数据参考。