Article(id=1192149543782330469, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1192149543010582589, articleNumber=null, orderNo=null, doi=10.13343/j.cnki.wsxb.20250220, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1742313600000, receivedDateStr=2025-03-19, revisedDate=null, revisedDateStr=null, acceptedDate=1748361600000, acceptedDateStr=2025-05-28, onlineDate=1762160200303, onlineDateStr=2025-11-03, pubDate=1756915200000, pubDateStr=2025-09-04, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1762160200303, onlineIssueDateStr=2025-11-03, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1762160200303, creator=13701087609, updateTime=1762160200303, updator=13701087609, issue=Issue{id=1192149543010582589, tenantId=1146029695717560320, journalId=1192105938417971205, year='2025', volume='65', issue='10', pageStart='4241', pageEnd='4713', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1762160200113, creator=13701087609, updateTime=1762160638682, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1192151382586175735, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1192149543010582589, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1192151382586175736, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1192149543010582589, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=4565, endPage=4578, ext={EN=ArticleExt(id=1192149544063348840, articleId=1192149543782330469, tenantId=1146029695717560320, journalId=1192105938417971205, language=EN, title=Application of a T6SS effector Txe1-based counterselection system for genome editing in
Edwardsiella piscicida, columnId=1192149543992045670, journalTitle=Acta Microbiologica Sinica, columnName=Research Article, runingTitle=null, highlight=null, articleAbstract=
Double-crossover homologous recombination using the SacB negative selection system is commonly employed for genome editing in Gram-negative bacteria. However, its negative selection efficiency varies significantly across strains, being frequently compromised by differences in metabolic characteristics or genomic composition. [Objective] To develop a novel counterselection system based on the type VI secretion system (T6SS) effector Txe1 to enhance the efficiency of seamless genome editing. [Methods] We first modified the conventional suicide plasmid pDM4 by introducing a kanamycin resistance gene, generating the derivative plasmid pDM4K. Subsequently, we replaced sacB with an l-arabinose-inducible expression cassette encoding the C-terminal domain of Txe1 (araC-PBAD::txe1CTD ), constructing a novel counterselection plasmid pTL1010. Using the virulence gene tssB of Edwardsiella piscicida FC2 as the target, we systematically evaluated and compared the counterselection efficiency of the Txe1 system with that of the conventional SacB system. [Results] Under induction with l-arabinose, the Txe1-based counterselection system achieved the efficiency of 91.1% (false-positive rate of 8.9%), outperforming the SacB system which had a false-positive rate of 100% (P<0.01). [Conclusion] The newly developed Txe1-based counterselection plasmid pTL1010 significantly enhances the efficiency of seamless genome editing in E. piscicida and provides a highly effective tool for precise genetic manipulation in Gram-negative bacteria.
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T6SS毒素
Txe1的负筛选系统在杀鱼爱德华氏菌基因组编辑中的应用, columnId=1192149544164012138, journalTitle=微生物学报, columnName=研究报告, runingTitle=null, highlight=null, articleAbstract=
以果聚糖蔗糖酶(sucrose-6-fructosyltransferase, SacB)为基础的双交换同源重组技术虽常用于革兰氏阴性菌基因组编辑,但其负筛选效率在不同菌株间常存在显著差异,部分菌株因代谢特性或基因组组成差异导致效率低下。 【目的】 构建基于VI型分泌系统(T6SS)效应蛋白Txe1的新型负筛选体系,以提升无痕基因组编辑效率。 【方法】 改造传统自杀质粒pDM4,引入卡那霉素抗性基因,获得衍生质粒pDM4K;再以阿拉伯糖诱导型Txe1毒素C端结构域表达盒(araC-PBAD::txe1CTD )替换质粒中的sacB基因,构建新型负筛选质粒pTL1010。以杀鱼爱德华氏菌FC2株毒力相关基因tssB为靶点,系统比较Txe1与SacB系统的负筛选效率。 【结果】 阿拉伯糖诱导下,Txe1系统的负筛选效率达91.1% (假阳性率8.9%),显著优于传统SacB系统(假阳性率100%,P<0.01)。 【结论】 新型Txe1负筛选质粒pTL1010显著提高了杀鱼爱德华氏菌的无痕基因编辑效率,为革兰氏阴性菌精准遗传操作提供了高效新工具。
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作者贡献声明
王鹏程:研究构思和设计,数据收集和处理,论文撰写和修改;张明明:数据收集和处理,实验操作,参与论文讨论;张朝政:实验操作,数据分析,提供技术支持;李超:协助数据分析;曹健波:数据分析;严小军:项目指导;陶震:研究构思和设计,数据分析,论文撰写和修改,项目指导与监督。
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1College of Fisheries, Zhejiang Ocean University, Zhoushan, Zhejiang, China), AuthorCompanyExt(id=1192161142127604602, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, companyId=1192161142110827384, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1浙江海洋大学 水产学院,浙江 舟山)]), AuthorCompany(id=1192161142190519163, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, xref=2, ext=[AuthorCompanyExt(id=1192161142198907772, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, companyId=1192161142190519163, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong, China), AuthorCompanyExt(id=1192161142207296381, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, companyId=1192161142190519163, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2青岛农业大学 海洋科学与工程学院,山东 青岛)])], figs=[ArticleFig(id=1192161146309325739, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=EN, label=Figure 1, caption=
Schematic diagram of the construction process of pTL1010 plasmid., figureFileSmall=WtaoiGp1r8p97U91Ltb83g==, figureFileBig=OGlBiQ8KfVunj7cApdoBbA==, tableContent=null), ArticleFig(id=1192161146426766252, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=CN, label=图1, caption=
pTL1010质粒构建全过程示意图, figureFileSmall=WtaoiGp1r8p97U91Ltb83g==, figureFileBig=OGlBiQ8KfVunj7cApdoBbA==, tableContent=null), ArticleFig(id=1192161146523235245, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=EN, label=Figure 2, caption=
Verification of the expression regulation of arabinose-induced Txe1 toxin in Escherichia coli S17-1 λpir. A: TSA plate containing kanamycin (50 μg/mL) only; B: TSA plate containing kanamycin and 0.4% (W/V) l-arabinose; C: Negative control, E. coli S17-1 λpir without plasmid does not grow on kanamycin plate; D: Growth status on TSA plates containing only 0.4% (W/V) l-arabinose., figureFileSmall=4/0pKqKrqgWfT6AVazpnMQ==, figureFileBig=+gWQOQipnkE2vbD+O9FDKQ==, tableContent=null), ArticleFig(id=1192161146883945391, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=CN, label=图2, caption=
阿拉伯糖诱导的Txe1毒素表达调控在大肠杆菌S17-1 λpir中的验证。A:仅含卡那霉素(50 μg/mL)的TSA平板;B:同时含卡那霉素和质量体积分数0.4%的l-阿拉伯糖的TSA平板;C:阴性对照,即未携带质粒的大肠杆菌S17-1 λpir在含卡那霉素的平板上的生长情况;D:仅含质量体积分数0.4%的l-阿拉伯糖的TSA平板的生长情况。, figureFileSmall=4/0pKqKrqgWfT6AVazpnMQ==, figureFileBig=+gWQOQipnkE2vbD+O9FDKQ==, tableContent=null), ArticleFig(id=1192161146972025777, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=EN, label=Figure 3, caption=
PCR validation of the first homologous recombination in pTL1010-ΔtssB and pDM4K-ΔtssB groups. A: PCR validation results of the pTL1010-ΔtssB group; B: PCR validation results of the pDM4K-ΔtssB group. In both panels, the top row represents PCR amplification using the Vec-Ins-F/R primers; The bottom row represents PCR amplification using the tssB-US-inter-F/tssB-DS-inter-R primers. Lane M: DL2000 DNA marker; Lanes 1-21: Tested colonies; P: Positive control (pDM4K-ΔtssB plasmid); C: Blank control (FC2 wild type strain without plasmid); N: Negative control (ddH2O)., figureFileSmall=Mj6aYFCqY386/IE8nNViNQ==, figureFileBig=OBr4VGNkdih1pBDEdlNo8A==, tableContent=null), ArticleFig(id=1192161148012213172, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=CN, label=图3, caption=
pTL1010-ΔtssB 与pDM4K-ΔtssB 组第一次同源重组的PCR验证。A:pTL1010-ΔtssB组PCR验证结果;B:pDM4K-ΔtssB组PCR验证结果。两图中,上行为Vec-Ins-F/R引物扩增结果;下行为tssB-US-inter/tssB-DS-inter物扩增结果。泳道M:DL2000 DNA marker;泳道1-21:测试菌落;P:阳性对照(pDM4K-ΔtssB质粒);C:空白对照(无质粒的FC2野生株);N:阴性对照(ddH2O)。, figureFileSmall=Mj6aYFCqY386/IE8nNViNQ==, figureFileBig=OBr4VGNkdih1pBDEdlNo8A==, tableContent=null), ArticleFig(id=1192161148108682166, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=EN, label=Figure 4, caption=
Comparison of the second homologous recombination results of the pTL1010-ΔtssB group based on the tssB-US-inter/tssB-DS-inter primers. Lane M: DL2000 DNA marker; Lanes 1-45: Tested colonies; P: Positive control (pTL1010-ΔtssB or pDM4K-ΔtssB plasmid); N: Negative control (ddH2O); R1, R2, R3: Biological replicates., figureFileSmall=AmgB18l1ug5PDpOYBgWqkg==, figureFileBig=UVHV5W/Keohb8UH5G8tvog==, tableContent=null), ArticleFig(id=1192161148171596728, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=CN, label=图4, caption=
基于 tssB-US-inter/tssB-DS-inter引物的pTL1010-ΔtssB 组第二次同源重组结果对比图。泳道M:DL2000 DNA marker;泳道1-45:测试菌落;P:阳性对照(pTL1010-ΔtssB或pDM4K-ΔtssB质粒);N:阴性对照(ddH2O);R1、R2、R3:生物学重复。, figureFileSmall=AmgB18l1ug5PDpOYBgWqkg==, figureFileBig=UVHV5W/Keohb8UH5G8tvog==, tableContent=null), ArticleFig(id=1192161148280648634, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=EN, label=Figure 5, caption=
Comparison of the second homologous recombination results of the pDM4K-ΔtssB group based on thetssB-US-inter/tssB-DS-inter. A: Screening results with 5% sucrose; B: Screening results with 10% sucrose; C: Screening results with 20% sucrose. Lane M: DL2000 DNA marker; Lanes 1-45: Tested colonies; P: Positive control (pTL1010-ΔtssB or pDM4K-ΔtssB plasmid); N: Negative control (ddH2O); R1, R2, R3: Biological replicates. The same below., figureFileSmall=r2BfnehFClWAGR3yU9sSgw==, figureFileBig=fXQrDSJhwOE49Wkp3AiNVg==, tableContent=null), ArticleFig(id=1192161148465198011, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=CN, label=图5, caption=
基于 tssB-US-inter/tssB-DS-inter引物的pDM4K-ΔtssB 组第二次同源重组结果对比图。A:5%蔗糖筛选结果;B:10%蔗糖筛选结果;C:20%蔗糖筛选结果。泳道M:DL2000 DNA marker;泳道1-45:测试菌落;P:阳性对照(pTL1010-ΔtssB或pDM4K-ΔtssB质粒);N:阴性对照(ddH2O);R1、R2、R3:生物学重复。下同。, figureFileSmall=r2BfnehFClWAGR3yU9sSgw==, figureFileBig=fXQrDSJhwOE49Wkp3AiNVg==, tableContent=null), ArticleFig(id=1192161148662330300, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=EN, label=Figure 6, caption=
Comparison of the second homologous recombination efficiencies between pTL1010-ΔtssB and pDM4K-ΔtssB systems. pTL1010: Efficiency of the pTL1010-ΔtssB system; pDM4K (5% SUC, 10% SUC, 20% SUC): The system efficiency of pDM4K-ΔtssB at sucrose concentrations of 5%, 10%, and 20%. Statistical comparison was performed using an independent-samples t-test; The pTL1010 system efficiency was significantly higher than that of the pDM4K system (** indicates P<0.01). Error bars represent the mean±SD of three independent replicates (n=3)., figureFileSmall=h8W0eegOPTtO/fkRVwBRVg==, figureFileBig=kn7BWBEbxswW0ufiagGgiQ==, tableContent=null), ArticleFig(id=1192161148783965117, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=CN, label=图6, caption=
pTL1010-ΔtssB 与pDM4K-ΔtssB 系统第二次同源重组效率的比较。pTL1010:pTL1010-ΔtssB系统效率;pDM4K (5% SUC、10% SUC、20% SUC):pDM4K-ΔtssB在蔗糖浓度为5%、10%及20%时的系统效率。采用独立样本t检验比较两组数据;pTL1010系统效率显著高于pDM4K系统(**表示P<0.01)。误差条表示3次独立重复的标准差(均值±SD,n=3)。, figureFileSmall=h8W0eegOPTtO/fkRVwBRVg==, figureFileBig=kn7BWBEbxswW0ufiagGgiQ==, tableContent=null), ArticleFig(id=1192161148855268286, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=EN, label=Figure 7, caption=
PCR verification results for the tssB gene knockout in the pTL1010-ΔtssB and pDM4K-ΔtssB groups based on the tssB-del-F/R primers. A and B show PCR amplification results using primers tssB-del-F/R for colonies selected from the pTL1010-ΔtssB and pDM4K-ΔtssB groups, respectively., figureFileSmall=odCTHu2JtyO625pYHSCO/w==, figureFileBig=T1pWLC0Pv2epWrC+fqTAIA==, tableContent=null), ArticleFig(id=1192161148926571458, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=CN, label=图7, caption=
基于 tssB-del-F/R引物的pTL1010-ΔtssB 与pDM4K-ΔtssB 组敲除 tssB 基因的PCR验证结果。A:pTL1010-ΔtssB组tssB基因敲除的PCR验证结果;B:pDM4K-ΔtssB组tssB基因敲除的PCR验证结果。两图中,PCR扩增使用tssB-del-F/R引物。, figureFileSmall=odCTHu2JtyO625pYHSCO/w==, figureFileBig=T1pWLC0Pv2epWrC+fqTAIA==, tableContent=null), ArticleFig(id=1192161149039817669, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=EN, label=Figure 8, caption=
Pathogenicity of the tssB gene knockout mutant of Edwardsiella piscicida strain FC2 to zebrafish. A: Survival curves of zebrafish following intraperitoneal injection with WT strain, ΔtssB mutant, or PBS (control) over a 10-day observation period (n=30); B: Representative clinical signs and appearances of zebrafish from each treatment group., figureFileSmall=x2lQlQdbiL4gkl8ZEA126g==, figureFileBig=Xlg0qtOxJiVjwpRJEI2lww==, tableContent=null), ArticleFig(id=1192161149136286663, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=CN, label=图8, caption=
杀鱼爱德华氏菌FC2株 tssB 基因敲除突变株对斑马鱼致病性。A:斑马鱼腹腔注射野生型菌株(WT)、ΔtssB突变株或PBS (对照)后10 d观察期内的生存曲线(n=30);B:各处理组斑马鱼的典型临床症状及外观表现。, figureFileSmall=x2lQlQdbiL4gkl8ZEA126g==, figureFileBig=Xlg0qtOxJiVjwpRJEI2lww==, tableContent=null), ArticleFig(id=1192161149220172745, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=EN, label=Table 1, caption=
Bacterial strains and plasmids used in this study
, figureFileSmall=null, figureFileBig=null, tableContent=
菌株与质粒 Strains and plasmids | 说明 Description | 来源 Source |
|---|
| Edwardsiella piscicida |
| FC2 | Wild type strain isolated from freshwater fish; Camr | Laboratory stock |
| ΔtssB | TssB knockout of strain FC2; Camr | This study |
| Escherichia coli | | |
| S17-1 λpir | Strain for conjugation of π-requiring plasmids, carrying the λpir gene | [11] |
| Plasmids | | |
| pK18mobSacB | Suicide vector with sacB counterselection gene; Kanr | [11] |
| pTxe1CT | Expression vector with arabinose-inducible T6SS toxin Txe1 from P. plecoglossicida | [11] |
| pDM4 | Suicide vector with sacB gene; oriR6K; Camr | [14] |
| pDM4K | pDM4 derivative with chloramphenicol resistance gene replaced by kanamycin resistance gene; Kanr | This study |
| pTZ1010 | pDM4K derivative with sacB and upstream promoter replaced by araC-P BAD ::txe1CTD from pTxe1CT; Ampr | This study |
| pTZ1010-ΔtssB | pTZ1010 vector containing tssB homologous arms; Kanr | This study |
), ArticleFig(id=1192161149283087307, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=CN, label=表1, caption=
本研究所用菌株及质粒
, figureFileSmall=null, figureFileBig=null, tableContent=
菌株与质粒 Strains and plasmids | 说明 Description | 来源 Source |
|---|
| Edwardsiella piscicida |
| FC2 | Wild type strain isolated from freshwater fish; Camr | Laboratory stock |
| ΔtssB | TssB knockout of strain FC2; Camr | This study |
| Escherichia coli | | |
| S17-1 λpir | Strain for conjugation of π-requiring plasmids, carrying the λpir gene | [11] |
| Plasmids | | |
| pK18mobSacB | Suicide vector with sacB counterselection gene; Kanr | [11] |
| pTxe1CT | Expression vector with arabinose-inducible T6SS toxin Txe1 from P. plecoglossicida | [11] |
| pDM4 | Suicide vector with sacB gene; oriR6K; Camr | [14] |
| pDM4K | pDM4 derivative with chloramphenicol resistance gene replaced by kanamycin resistance gene; Kanr | This study |
| pTZ1010 | pDM4K derivative with sacB and upstream promoter replaced by araC-P BAD ::txe1CTD from pTxe1CT; Ampr | This study |
| pTZ1010-ΔtssB | pTZ1010 vector containing tssB homologous arms; Kanr | This study |
), ArticleFig(id=1192161149383750606, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=EN, label=Table 2, caption=
Primers used in this study
, figureFileSmall=null, figureFileBig=null, tableContent=
引物名称 Primers name | 引物序列 Primer sequences (5′→3′) | 描述 Description | 退火温度 Annealing temperature (℃) | 产物大小 Product size (bp) |
|---|
| pDM4-F | CCTTCTTGACGAGTTCTTCTGATTTTTTTAAGGCAGTTATTGGTG | To amplify the resistance gene replacement from pDM4 | 60 | 6 381 |
| pDM4-R | CCCTGAGTGCTTGCGGCAACGTCTCATTTTCGCCAAAAGT |
| Kan-F | AAAATGAGACGTTGCCGCAAGCACTCAGGGCGCAA | To amplify the kanamycin resistance gene fragment from pK18mobSacB | 60 | 1 172 |
| Kan-R | CAATAACTGCCTTAAAAAAATCAGAAGAACTCGTCAAGAAGGCG |
| pDM4K-F | GCTTGCGGAAACAAATAAAAACGCAAAAGAAAATGCCGATATC | To amplify the suicide plasmid vector pDM4K | 60 | 5 644 |
| pDM4K-R | GTCATAATTGGTAATGGGTTAAAAAGGATCTTAAGGCCT |
| Txe1-F | TTTAACCCATTACCAATTATGACAACTTGACGGCTACATCATTC | To amplify the arabinose-induced lethal gene fragments | 60 | 1 671 |
| Txe1-R | TTTGCGTTTTTATTTGTTTCCGCAAGCCCCCAGT |
| tssB-Seq-F | CAGCGGTCAACCGACTGCG | To amplify DNA fragments of tssB and its flanking regions from E. piscicida KE5 | 60 | 3 091 |
| tssB-Seq-R | CTGCGGCTCATAAAGCTGCC |
| tssB-US-F | CGCACTAGTAAGCGTATGCTGATCGCTAAGCAA | To amplify the upstream fragment of tssB for overlap PCR | 60 | 561 |
| tssB-US-R | TGTTCGCTCATGGCATGAAGTCATCTCCGTAACATTTCTTACAAC |
| tssB-DS-F | GATGACTTCATGCCATGAGCGAACAGAACTTGCCA | To amplify the downstream fragment of tssB for overlap PCR | 60 | 547 |
| tssB-DS-R | AATGTCGACTGTGAGATCTCCTCCAGCAGGAACA |
| Vec-Ins-F | GGGATGTAACGCACTGAGAA | To target the backbone of pDM4K/pTL1010 | 55 | 1 430 |
| Vec-Ins-R | TCCAGTGGCTTCTGTTTCTATC |
| tssB-US-inter | CGGATAGTCGAGATTGGAATGAA | To test whether the tssB gene was successfully knocked out | 55 | 386/893 |
| tssB-DS-inter | TCATGCATAATGGCGGAGAG |
| tssB-del-F | GAAAGCAAGCAGCATACGTTGGA | To detect the presence of tssB gene | 55 | 162 |
| tssB-del-R | TTTCAGCTTGGGAAGCGGAGTCG |
| etfD-F | GGTAACCTGATTTGGCGTTC | To verify E. piscicida strains | 55 | 445 |
| etfD-R | GGATCACCTGGATCTTACC |
| EPF | CTTTGATCATGGTTGCGGAA | To identify E. piscicida strains | 58 | 130 |
| EPR | CGGCGTTTTCTTTTCTCG |
), ArticleFig(id=1192161149505385425, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1192149543782330469, language=CN, label=表2, caption=
本研究所用引物
, figureFileSmall=null, figureFileBig=null, tableContent=
引物名称 Primers name | 引物序列 Primer sequences (5′→3′) | 描述 Description | 退火温度 Annealing temperature (℃) | 产物大小 Product size (bp) |
|---|
| pDM4-F | CCTTCTTGACGAGTTCTTCTGATTTTTTTAAGGCAGTTATTGGTG | To amplify the resistance gene replacement from pDM4 | 60 | 6 381 |
| pDM4-R | CCCTGAGTGCTTGCGGCAACGTCTCATTTTCGCCAAAAGT |
| Kan-F | AAAATGAGACGTTGCCGCAAGCACTCAGGGCGCAA | To amplify the kanamycin resistance gene fragment from pK18mobSacB | 60 | 1 172 |
| Kan-R | CAATAACTGCCTTAAAAAAATCAGAAGAACTCGTCAAGAAGGCG |
| pDM4K-F | GCTTGCGGAAACAAATAAAAACGCAAAAGAAAATGCCGATATC | To amplify the suicide plasmid vector pDM4K | 60 | 5 644 |
| pDM4K-R | GTCATAATTGGTAATGGGTTAAAAAGGATCTTAAGGCCT |
| Txe1-F | TTTAACCCATTACCAATTATGACAACTTGACGGCTACATCATTC | To amplify the arabinose-induced lethal gene fragments | 60 | 1 671 |
| Txe1-R | TTTGCGTTTTTATTTGTTTCCGCAAGCCCCCAGT |
| tssB-Seq-F | CAGCGGTCAACCGACTGCG | To amplify DNA fragments of tssB and its flanking regions from E. piscicida KE5 | 60 | 3 091 |
| tssB-Seq-R | CTGCGGCTCATAAAGCTGCC |
| tssB-US-F | CGCACTAGTAAGCGTATGCTGATCGCTAAGCAA | To amplify the upstream fragment of tssB for overlap PCR | 60 | 561 |
| tssB-US-R | TGTTCGCTCATGGCATGAAGTCATCTCCGTAACATTTCTTACAAC |
| tssB-DS-F | GATGACTTCATGCCATGAGCGAACAGAACTTGCCA | To amplify the downstream fragment of tssB for overlap PCR | 60 | 547 |
| tssB-DS-R | AATGTCGACTGTGAGATCTCCTCCAGCAGGAACA |
| Vec-Ins-F | GGGATGTAACGCACTGAGAA | To target the backbone of pDM4K/pTL1010 | 55 | 1 430 |
| Vec-Ins-R | TCCAGTGGCTTCTGTTTCTATC |
| tssB-US-inter | CGGATAGTCGAGATTGGAATGAA | To test whether the tssB gene was successfully knocked out | 55 | 386/893 |
| tssB-DS-inter | TCATGCATAATGGCGGAGAG |
| tssB-del-F | GAAAGCAAGCAGCATACGTTGGA | To detect the presence of tssB gene | 55 | 162 |
| tssB-del-R | TTTCAGCTTGGGAAGCGGAGTCG |
| etfD-F | GGTAACCTGATTTGGCGTTC | To verify E. piscicida strains | 55 | 445 |
| etfD-R | GGATCACCTGGATCTTACC |
| EPF | CTTTGATCATGGTTGCGGAA | To identify E. piscicida strains | 58 | 130 |
| EPR | CGGCGTTTTCTTTTCTCG |
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