中华皮肤科杂志 ›› 2024, Vol. 57 ›› Issue (3): 240-245.doi: 10.35541/cjd.20230357

• 论著 • 上一篇    下一篇

不同实验条件对淋病奈瑟球菌体外转化效率的影响

李晓蝶,朱琳,洪毅勇,黄影,赖维,龚子鉴   

  1. 中山大学附属第三医院皮肤性病科,广州510630
  • 收稿日期:2023-06-19 修回日期:2024-01-09 发布日期:2024-03-04
  • 通讯作者: 龚子鉴 E-mail:zjsums@163.com
  • 基金资助:
    广东省自然科学基金(2018A030313042)

Effect of different experimental conditions on the in vitro transformation efficiency for Neisseria gonorrhoeae

Li Xiaodie, Zhu Lin, Hong Yiyong, Huang Ying, Lai Wei, Gong Zijian   

  1. Department of Dermatology and Venereology, the Third Affiliated Hospital, Sun Yat-sen University, Guangzhou 510630, China
  • Received:2023-06-19 Revised:2024-01-09 Published:2024-03-04
  • Contact: Gong Zijian E-mail:zjsums@163.com
  • Supported by:
    Natural Science Foundation of Guangdong Province(2018A030313042)

摘要: 【摘要】 目的 探讨不同实验条件对淋病奈瑟球菌(淋球菌)体外转化效率的影响。 方法 以淋球菌D株DNA为模板扩增penA基因,采用重叠延伸PCR制备penAA501V(耐药突变)基因,购买淋球菌penAH041基因(耐药阳性对照)。制备含penA/penAA501V/penAH041基因的质粒转化至大肠杆菌DH5α感受态细胞,采用蓝白筛选培养基克隆扩增;分别采用日本TaKaRa公司质粒提取试剂盒和天根生化科技(北京)有限公司高纯度质粒小提试剂盒提取质粒。以penA质粒、penAA501V质粒、penAH041质粒、penAA501V基因、penAH041基因为底物采用直接孵育法转化淋球菌受体菌株A43、A49,测定转化率(CFU/μg)及头孢曲松(CRO)的最小抑菌浓度(MIC)。以penAA501V、penAH041基因为底物,采用脂质体法转化受体菌株A43、A49,观察转化效率及头孢曲松的MIC。结果 以D株淋球菌DNA为模板,成功获得1 749 bp的penA及penAA501V基因。提取质粒并电泳后,TaKaRa试剂盒提取的含淋球菌penA、penAA501V、penAH041基因的质粒主要集中在2 500 bp处,迁移速度较快;天根试剂盒提取的质粒主要集中在5 000 bp处,迁移速度较慢。直接孵育法转化时,含野生型penA的A43株的MIC为0.001 μg/ml,转入penA质粒后MIC上升至0.002 μg/ml,转入penAA501V质粒和penAA501V基因转化株MIC均为0.004 μg/ml,转入阳性对照penAH041质粒和penAH041基因后MIC均升至0.512 μg/ml;各底物孵育后CRO对A49株的MIC值与空白对照相同,均为0.016 μg/ml。脂质体法转化时,含野生型penA的A43株对CRO的MIC是0.002 μg/ml,A49株MIC为0.016 μg/ml;penAA501V基因转化A43株后MIC升至0.004 μg/ml,转化A49株后仍为0.016 μg/ml;阳性对照penAH041基因转化A43和A49株后MIC均升至0.250 μg/ml,较空白对照分别升高至125倍和15.6倍。结论 选择质粒为底物采用直接孵育法对A43株淋球菌有较好转化效率,不同质粒提取方法可能影响转化效率,对于直接孵育法转化效率不高的A49株可采用脂质体法。

关键词: 淋病奈瑟球菌, 转化, 细菌, 质粒, 头孢曲松, 抗药性, 细菌, penA基因, 最小抑菌浓度

Abstract: 【Abstract】 Objective To evaluate the effect of different experimental conditions on the in vitro transformation efficiency for Neisseria gonorrhoeae. Methods The penA genes were amplified using genomic DNA of the gonococcal strain D as a template. The overlap extension PCR method was used to prepare the drug-resistant penAA501V gene, and the drug-resistant penAH041 gene was purchased and served as a positive control. Plasmids containing the penA/penAA501V/penAH041 genes were prepared and transformed into DH5α competent cells of Escherichia coli, and then were cloned in the blue-white screening medium; plasmids were extracted by using the MiniBEST plasmid purification kit from Japanese TaKaRa company and the TIANpure mini plasmid kit from Beijing Tiangen Biochemical Technology Co., Ltd separately. The penA plasmids, penAA501V plasmids, penAH041 plasmids, penAA501V genes, and penAH041 genes were used as substrates and transformed into gonococcal recipient strains A43 and A49 by using the direct incubation method, and the transformation rates (CFU/μg) and minimum inhibitory concentrations (MICs) of ceftriaxone (CRO) were measured. The penAA501V and penAH041 genes were also used as substrates and transformed into gonococcal recipient strains A43 and A49 by using the liposome method, and the transformation efficiency and CRO MICs were determined. Results Using genomic DNA of the gonococcal strain D as the template, the 1 749-bp penA and penAA501V genes were successfully obtained. After extraction of plasmids and electrophoretic analysis, the plasmids containing the gonococcal penA, penAA501V, and penAH041 genes extracted with TaKaRa kits mainly showed bands at the position of 2 500 bp, with relatively high migration rates, while the plasmids extracted with Tiangen kits mainly produced bands at the position of 5 000 bp, with relatively low migration rates. After transformation by using the direct incubation method, the MIC of CRO was 0.001 μg/ml for the recipient strain A43 containing the wild-type penA gene, which increased to 0.002, 0.004, and 0.004 μg/ml after transformation with the penA plasmids, penAA501V plasmids, and penAA501V genes respectively, while the MICs both rose to 0.512 μg/ml for strains A43 transformed with the positive control penAH041 plasmid and penAH041 gene; after incubation with various substrates, the MICs were all 0.016 μg/ml for the strain A49, which were the same as the MIC for the blank control strain (incubated without any substrates). After transformation by using the liposome-based method, the MIC of CRO was 0.002 μg/ml for the strain A43 containing the wild-type penA gene, and 0.016 μg/ml for the corresponding strain A49; after transformation with penAA501V genes, the MIC rose to 0.004 μg/ml for the strain A43, but remained 0.016 μg/ml for the strain A49; the MICs both rose to 0.250 μg/ml for strains A43 and A49 after transformation with positive control penAH041 genes, which were 125 times and 15.6 times that for the blank control strain, respectively. Conclusions The approach with plasmids as substrates and using the direct incubation method exhibited better transformation efficiency for the gonococcal strain A43. Different plasmid extraction methods may affect transformation efficiency, and the liposome-based method could be used for the strain A49 whose transformation efficiency was low when using the direct incubation method.

Key words: Neisseria gonorrhoeae, Transformation, bacterial, Plasmids, Ceftriaxone, Drug resistance, bacterial, penA gene, Minimum inhibitory concentration

引用本文

李晓蝶 朱琳 洪毅勇 黄影 赖维 龚子鉴. 不同实验条件对淋病奈瑟球菌体外转化效率的影响[J]. 中华皮肤科杂志, 2024,57(3):240-245. doi:10.35541/cjd.20230357

Li Xiaodie, Zhu Lin, Hong Yiyong, Huang Ying, Lai Wei, Gong Zijian. Effect of different experimental conditions on the in vitro transformation efficiency for Neisseria gonorrhoeae [J]. Chinese Journal of Dermatology, 2024, 57(3): 240-245.doi:10.35541/cjd.20230357