China Animal Husbandry and Veterinary Medicine ›› 2019, Vol. 46 ›› Issue (11): 3341-3349.doi: 10.16431/j.cnki.1671-7236.2019.11.024

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Construction and Biological Characteristics Analysis of asd Gene Mutant Balanced Lethal Host-vector System of Salmonella Typhimurium LH430 Strain

ZHANG Mingliang1,2,3, SUN Changjiang2, GU Jingmin2, CUI Ziyin2, HAN Wenyu2   

  1. 1. College of Biological Science and Food Engineering, Anyang Institute of Technology, Anyang 455000, China;
    2. College of Veterinary Medicine, Jilin University, Changchun 130000, China;
    3. Academician Workstation of Animal Disease Control and Nutrition Immunity in Henan Province, Anyang 455000, China
  • Received:2019-04-04 Online:2019-11-20 Published:2019-11-25

Abstract: This study was aimed to construct a balanced lethal system based on attenuated Salmonella Typhimurium.Cat gene was recombined into the position of asd gene in Salmonella Typhimurium LH430 strain,then the thermo sensitive plasmid pCP20 was transferred into the strain to eliminate the Cat gene fragment,and the mutant strain Δasd LH430 was identified by PCR.Then the balanced lethal system of Salmonella Typhimurium Δasd LH430(pYA3493) was successfully constructed with the plasmid pYA3493 transferred into Δasd LH430.The mutant strain lost the ability to survive in the medium without DAP,had the same ability of using carbon sources was consistent with parent strains,and inherited the biochemical characteristics from parent strains based on nine biochemical experiments,Δasd LH430(pYA-gfp) carrying green fluorescent gene was successfully constructed,and the green fluorescent protein could be also inherited the deletion fragment of 423 bp.Then the Δasd LH430(pYA-gfp) carrying green fluorescent gene was successfully constructed,and the green fluorescent protein could be effectively expressed by Δasd LH430(pYA-gfp).In conclusion,the balanced lethal system Δasd LH430(pYA3493) was successfully constructed in this study,and could effectively express the carrying genes,the system could be used as a living vaccine vector to carry exogenous genes.

Key words: Salmonella Typhimurium; balanced lethal system; living vaccine vector; biological characteristics

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