绘制地理上不同的BCG疫苗菌株的族系和血统历史
Linzy Elton1, Sandeep Kasaragod2, Helen Donoghue1
1Centre for Clinical Microbiology, Division of Infection and Immunity, University College London, London, UK.
Microbial genomics
|August 1, 2023
概括
细菌卡尔梅特-盖林 (BCG) 疫苗菌株的遗传变异,特别是那些在1927年之前和之后分发的,与结核病疫苗疗效的差异相关. 这项研究分析了BCG全基因组序列,以确定与菌株分歧相关的关键遗传标记.
科学领域:
- 微生物学和免疫学
- 遗传学和基因组学 在
- 疫苗开发 疫苗开发
背景情况:
- 细菌卡尔梅特-盖林 (BCG) 疫苗是唯一广泛使用的结核病疫苗,在不同地区表现出不同的疗效.
- 假设BCG疫苗菌株的遗传分歧,源于分发后不同的培养方法,有助于有效性变化.
- 了解BCG菌株遗传学对于改善结核病预防策略至关重要.
研究的目的:
- 为了研究历史性巴塞勒斯卡尔梅特-盖林 (BCG) 疫苗菌株之间的遗传差异.
- 为了将观察到的遗传变异与菌株特征,地理分类和历史分布日期相关联.
- 确定与BCG菌株演变和疫苗疗效潜在影响相关的特定遗传标记 (差异区域和SNP).
主要方法:
- 从档案中恢复和培养历史的冷解BCG菌株.
- 使用牛津纳米孔技术复苏的BCG菌株的全基因组测序.
- 遗传学分析以确定差异区域 (RDs) 和单核酸多态 (SNP),比较早期 (1927年之前) 和晚期 (1927年后) 的分布菌株.
主要成果:
- 在1934年之前和之后分发的BCG菌株之间观察到形态差异.
- 对于地理特定的菌株 (例如,BCG-俄罗斯,BCG-日本,BCG-丹麦) 进行了家族遗传集群.
- 在RD2,RD171和RD713中的删除与晚期菌株 (1927年后) 相关,而sigK,plaA,mmaA3和eccC5中的SNP与早期菌株相关.
- 分布日期 (在1927年之前或之后) 显示了与RD和与毒性相关的SNP的遗传差异的最强相关性.
结论:
- 历史分发日期是推动BCG疫苗菌株遗传差异的一个重要因素.
- 特定的基因变异,包括RDS和SNP,与早期和晚期BCG菌株有关,可能会影响疫苗的性能.
- 对这些遗传变异的功能影响进行进一步的研究是有必要的,以了解它们在结核病疫苗疗效中的作用.
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