论文
论文标题: Construction of Streptococcus agalactiae sialic acid mutant and evaluation of its potential as a live attenuated vaccine in Nile tilapia (Oreochromis niloticus)
作者: Hao, Jingwen; Wang, Shuyi; Wei, Zhaohui; Zhang, Qianqian; Wu, Zhenbing; Lin, Yaoyao; Yang, Jicheng; Zhang, Jinyong; Zhang, Defeng; Li, Aihua
出版刊物: JOURNAL OF APPLIED MICROBIOLOGY
出版日期: OCT
出版年份: 2022
卷/期:
DOI: 10.1111/jam.15706
论文摘要: Aims This study aimed to develop a live attenuated vaccine as an effective approach to prevent streptococcosis in tilapia (Oreochromis niloticus). Methods and results We eliminated the virulence factor, sialic acid (Sia) encoded by the neuA-D gene cluster from the Group B Streptococcus (Streptococcus agalactiae, GBS) strain WC1535, to construct Sia-deficient S. agalactiae (Delta Sia) mutant by homologous recombination. Results showed that the Delta Sia mutant had higher adherence to HEp-2 cells and lower resistance to RAW264.7 cell phagocytosis than the wild-type S. agalactiae. The virulence of the Delta Sia mutant to tilapia dramatically decreased with no virulence recovery. The relative percent survivals (RPSs) were 50.00% and 54.50% at 30 days when challenged at the wild-type WC1535 doses of 1.0 x 10(7) and 5.0 x 10(7) CFU fish(-1), respectively, via intraperitoneal (IP) injection. The tilapia vaccinated via IP injection with the Delta Sia mutant induced strong antibody agglutination titers. The expression of IL-1 beta, TNF-alpha, MHC-I alpha, and MHC-II beta could be enhanced in the intestine, spleen, and head kidney for tilapia administered with the Delta Sia mutant. Conclusions GBS Sia plays a critical role in adherence to HEp-2 cells and resistance to the immune clearance of RAW264.7 cells. Moreover, the Delta Sia mutant is a safe, stable, and immunogenic live attenuated vaccine candidate to protect tilapia against GBS infection. Significance and impact of study The results offer more evidence of the importance of Sia in GBS and may be instructive in the control of tilapia streptococcosis.
== 实验室与学会 ==
  • == 实验室与学会 ==
  • 水产品种创制与高效养殖全国重点实验室
  • 中国科学院藻类生物学重点实验室
  • 农业部淡水养殖病害防治重点实验室
  • 武汉白暨豚保护基金会
  • 湖北省海洋湖沼学会
  • 中国动物学会原生动物学分会
  • 中国动物学会斑马鱼分会
  • 湖北省暨武汉动物学会
  • 中国水产学会鱼病学专业委员会
  • 中国鱼类学会
== 平台建设 ==
  • == 平台建设 ==
  • “一带一路”海域赤潮数据库
  • 国家水生生物种质资源库
  • 国家斑马鱼资源中心
  • 中国科学院淡水藻种库
  • 中国科学院武汉生命科学大型仪器区域中心
  • 湿地生态系统观测研究野外站联盟
  • 中国科学院水生生物研究所分析测试中心
  • 中国科学院超级计算武汉分中心
  • 水生生物博物馆
== 相关网站推荐 ==
  • == 相关网站推荐 ==
  • 中国科学院
  • 农业农村部
  • 科学技术部
  • 生态环境部
  • 国家自然科学基金委员会
  • 中国科学院武汉分院
  • 湖北省科学技术厅
  • 湖北省生态环境厅
  • 湖北省农业农村厅