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在人类大脑感染中,在缺陷的麻疹病毒中存在偏差性突变和其他遗传变化
R Cattaneo1, A Schmid, D Eschle
1Institute for Molecular Biology I, University of Zürich, Switzerland.
Cell
|October 21, 1988
概括
在大脑中持续的麻疹病毒 (MV) 感染显示出显著的突变. 这些遗传变化,特别是在矩阵基因中,可能会增强大脑细胞中的病毒传播.
科学领域:
- 病毒学 病毒学
- 神经科学是一个神经科学.
- 遗传学 遗传学 是一个
背景情况:
- 亚急性硬化大脑炎 (SSPE) 和麻疹包容体脑炎 (MIBE) 是持续性麻疹病毒 (MV) 感染的严重神经并发症.
- 了解这些慢性感染期间MV的遗传变化对于阐明疾病发病因子至关重要.
研究的目的:
- 研究 MV 基因在持久性感染中的突变格局.
- 确定观察到的突变是否为病毒在中枢神经系统的传播提供了选择性优势.
主要方法:
- 从SSPE和MIBE患者的大脑解剖中克隆完整的MV基因转录.
- 用DNA测序来识别核酸突变及其对氨基酸序列的影响.
- 在体外翻译测试以确认基因读取框架的变化.
主要成果:
- 大约2%的MV核酸在持续感染期间发生突变,其中35%影响了氨基酸序列.
- 突变改变了两个融合基因的读取框架,通过体外翻译证实了这一点.
- 在MIBE矩阵基因中的一个独特的突变集群显示了50%的U-to-C替代,表明有偏差的复制事件.
结论:
- 持续性MV感染中累积的突变,特别是在脑组织内,可以导致显著的遗传分歧.
- 特定的突变模式,如MIBE矩阵基因改变,可能代表适应性变化,有利于病毒在大脑中的持久性和传播.
- 这些发现表明,病毒遗传进化在严重MV相关的神经疾病的发病过程中起着作用.
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