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用Bifidobacterium-Escherichia coli的穿载体等离子体转化阴道菌
B M D N Kularatne1, Janet E Hill1
1Department of Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
Microbiology spectrum
|April 10, 2025
概括
研究人员开发了一种方法来基因转化Gardnerella vaginalis,这是细菌性阴道炎的一个关键细菌. 这一突破使得可以创建基因工具来研究G. vaginalis及其在阴道微生物组中的作用.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 妇科健康 妇科健康
背景情况:
- 阴道微生物群对女性生殖健康至关重要,其中包括乳杆菌. 通常是主导的.
- 一种被称为细菌性阴道炎 (BV) 的不平衡,涉及乳酸菌的减少和像Gardnerella spp.这样的细菌的过度生长.
- 了解加德内雷拉在BV中的作用受到缺乏研究其生物学的遗传工具的阻碍.
研究的目的:
- 开发一种可靠的方法,用于基因改造Gardnerella vaginalis.
- 描述G. vaginalis. 中外来DNA的维持和表达.
- 建立一个创建G. vaginalis研究遗传工具的基础.
主要方法:
- 电穿孔被用于将Bifidobacterium-E. coli的穿载体pKO403-lacZ'-Sp引入G. vaginalisATCC 49145.5的体内.
- 用斯佩克提诺米辛耐药性和β-银酸酶活性来评估转化效率和基因表达.
- 在没有选择性压力的情况下,通过监测阻力损失来评估等离子体的稳定性.
主要成果:
- 实现了可复制,尽管效率低 (~10^2 cfu/μg DNA),但G. vaginalis的转化.
- 转化后的G. vaginalis对表胺素的耐受性显著增加 (从2μg/mL增加到512μg/mL) 和β-银酸酶活性升高.
- 引入的等离子体在每个基因组中保持了大约3个副本,但在没有spectinomycin选择的情况下迅速消失 (在24小时后约5%的保留).
结论:
- 通过使用pKO403-lacZ'-Sp穿向量,可以通过电穿成功转化阴道.
- 穿向量被维持,它的基因在G. vaginalis中得到表达,证明了它的实用性.
- 这项研究为开发基因工具研究阴道微生物群中的G. vaginalis生物学提供了关键的起点.
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