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Articles by Fei Guo
Total Records ( 4 ) for Fei Guo
  Fei Guo , Yuanzhi Wang , Chuangfu Chen , Hui Zhang , Jun Qiao , Yan Ren , Junbo Zhang and Zhiqiang Li
  TFSS is an important virulence factor of Brucella, organized as one operon containing 12 different across the cell wall bacterial proteins among which VirB5 regulates the host phagocytosis of Brucella and the transportation of Brucella in the host cells. This study has constructed cDNA library from Brucella melitensis 16M-infected murine macrophage Raw264.7, identified and confirmed the interaction between Brucella VirB5 and FTH1 of RAW264.7 using yeast two-hybrid and Co-Immunoprecipitation (Co-IP) technologies. Subsequently, the morphological changes and the expression of apoptosis-related genes in Brucella-infected RAW264.7 cells have been investigated with Electron Microscope (EM) and real-time quantitative RT-PCR, respectively. The present study has demonstrated that VirB5 and FTH1 play important roles in intracellular parasitism of Brucella and inhibition of FHT1 expression accelerates the apoptosis of macrophage.
  Yuanzhi Wang , Ke Zhang , Yali Zhang , Hui Wang , Fei Guo , Lin Zhang , Hui Zhang , Lijuan CaoBuyun , Cui , Chengyao Li , Li Yuan , Wanjiang Zhang , Ze Xu and Chuangfu Chen
  An outbreak of brucellosis occurred in students on field practice at sheep farm in 2005 at Shihezi, Xinjiang Province, the North-West of China. Five of 7 (71.4%) students were seropositive, showing titers ≥1:160 IU mL-1 in STAT and diagnosed as acute brucellosis with physical examination. To characterize Brucella isolates from the outbreak, the research including face to face investigation, Brucella isolation, multiple locus VNTR-16 analysis (MLVA-16) and genome sequencing were carried out. The investigation showed 42.5% (1,293/3,042) of ewes are sero-positive with RBPT and almost half of ewes aborted. Although, no bacteria were isolated from student blood samples, five individual colonies were isolated from aborted sheep fetuses and were identified as B. melitensis biovar 3 by conventional microbiological tests. MLVA-16 typing indicated that the isolates were clustered in the East Mediterranean with genotype 42. They were similar to wild strains from Guangdong in 2008 and Inner Mongolia in 1994 and 1995. They were most close to strain bru0261 from Pakistan student studying in Germany. Genome sequence and phylogenomic tree showed that pathogen in this study was close to Chinese wild and vaccine strains such as B. melitensis M28, M5-90. Researchers first report pathogens isolated in 1980 and 2005 are genotype 42 containing novel MLVA-16 patterns (1-5-3-13-2-2-3-2-4-20-8-8-4-3-7-7) compared to that both in China and other countries.
  Fei Guo , Junbo Zhang , Chuangfu Chen , Yuanzhi Wang and Hui Zhang
  Brucellosis is an infectious disease that brings great economic burdens for developing countries. The vaccine S2 which is an attenuated Brucella suis (B. suis) strain has been used on a large scale in China. However, the immunity induced by S2 declined relative to those vaccinated with Rev-1 and S19 vaccines. Moreover, the vaccine S2 cannot differentiate natural from vaccinated infection. Therefore, a safer and more potent B. suis vaccine is needed. In this study, a vjbR mutant of B. suis (B. suisΔvjbR) was constructed overcome these drawbacks. The B. suisΔvjbR strain showed reduced survival capability in RAW264.7 macrophage and mice and induced high protective immunity in mice. In addition, B. suisΔvjbR induced an anti-Brucella-specific IgG (immunoglobulin G) response and stimulated the expression of gamma interferon (INFγ). Further, the vjbR antigen allowed serological differentiation between natural and vaccinated infection in mice. Therefore, B. suisΔvjbR was suggested as a safe and efficacious live vaccine candidate against virulent Brucella suis (B. suis) infection.
  Wolong Ma , Fei Guo , Antao Wang , Zhanhui Song and Chuangfu Chen
  A rifampin-resistant mutant of Brucella abortus, designated as RB51 was derived by repeated passage of strain 2308 on Trypticase soy supplemented with 1.5% agar and varying concentrations rifampin or penicillin. In this study, 325 Mb data was produced for RB51 using Illumina HiSeq 2000 sequencing platform. Based on the assemble result of RB51, researchers obtained that 36 scaffolds with GC content of 57.25% which contains 150 contigs and has genome size was about 3.26 Mb. Detail bioinformatics annotation of RB51 revealed that the genome contained 3,283 genes, the total length of genes was 2,797,347 bp which makes up 85.91% of genome. Comparative genomics analysis found that there was a tandem repeat sequence of 339 nucleotide in YP_413569.1 protein. In addition, RB51 encoded a glycosyltransferase wboA in scaffold12, an enzyme essential in the biosynthesis of O antigen which has been disrupted by IS711. In comparison with the reference genome B. abortus 2308, researchers found that RB51 contained 135 SNPs and 5 InDels among which 1 SNP and 2 InDels may be associated with virulent related to lipopolysaccharide.
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