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Kim BJ, Kim BR, Kook YH, Kim BJ. Development of a Live Recombinant BCG Expressing Human Immunodeficiency Virus Type 1 (HIV-1) Gag Using a pMyong2 Vector System: Potential Use As a Novel HIV-1 Vaccine. Front Immunol 2018; 9:643. [PMID: 29636755 PMCID: PMC5880907 DOI: 10.3389/fimmu.2018.00643] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 03/14/2018] [Indexed: 01/22/2023] Open
Abstract
Even though the rate of new human immunodeficiency virus type 1 (HIV-1) infections is gradually decreasing worldwide, an effective preventive vaccine for HIV-1 is still urgently needed. The recombinant Mycobacterium bovis BCG (rBCG) is promising for the development of an HIV-1 vaccine. Recently, we showed that a recombinant Mycobacterium smegmatis expressing HIV-1 gag in a pMyong2 vector system (rSmeg-pMyong2-p24) increased the efficacy of a vaccine against HIV-1 in mice. Here, we evaluated the potential of an rBCG expressing HIV-1 p24 antigen Gag in pMyong2 (rBCG-pMyong2-p24) in a vaccine application for HIV-1 infection. We found that rBCG-pMyong2-p24 elicited an enhanced HIV-1 p24 Gag expression in rBCG and infected antigen-presenting cells. We also found that compared to rBCG-pAL-p24 in a pAL5000 derived vector system, rBCG-pMyong2-p24 elicited enhanced p24-specific immune responses in vaccinated mice as evidenced by higher levels of HIV-1 Gag-specific CD4 and CD8 T lymphocyte proliferation, gamma interferon ELISPOT cell induction, antibody production, and cytotoxic T lymphocytes (CTL) responses. Furthermore, rBCG-pMyong2-p24 showed a higher level of p24-specific Ab production than rSmeg-pMyong2-p24 in the same pMyong2 vector system. In conclusion, our data indicated that a live recombinant BCG expressing HIV-1 Gag using a pMyong2 vector system, rBCG-pMyong2-p24 elicited an enhanced immune response against HIV-1 infections in a mouse model system. So, rBCG-pMyong2-p24 may have the potential as a prime vaccine in a heterologous prime-boost vaccine strategy for HIV-1 infection.
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Affiliation(s)
- Byoung-Jun Kim
- Department of Microbiology and Immunology, Biomedical Sciences, College of Medicine, Liver Research Institute, Seoul National University, Seoul, South Korea.,Department of Microbiology and Immunology, Biomedical Sciences, College of Medicine, Cancer Research Institute, Seoul National University, Seoul, South Korea
| | - Bo-Ram Kim
- Department of Microbiology and Immunology, Biomedical Sciences, College of Medicine, Liver Research Institute, Seoul National University, Seoul, South Korea.,Department of Microbiology and Immunology, Biomedical Sciences, College of Medicine, Cancer Research Institute, Seoul National University, Seoul, South Korea
| | - Yoon-Hoh Kook
- Department of Microbiology and Immunology, Biomedical Sciences, College of Medicine, Liver Research Institute, Seoul National University, Seoul, South Korea.,Department of Microbiology and Immunology, Biomedical Sciences, College of Medicine, Cancer Research Institute, Seoul National University, Seoul, South Korea
| | - Bum-Joon Kim
- Department of Microbiology and Immunology, Biomedical Sciences, College of Medicine, Liver Research Institute, Seoul National University, Seoul, South Korea.,Department of Microbiology and Immunology, Biomedical Sciences, College of Medicine, Cancer Research Institute, Seoul National University, Seoul, South Korea
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Kim BJ, Kim BR, Kook YH, Kim BJ. Role of the DNA Mismatch Repair Gene MutS4 in Driving the Evolution of Mycobacterium yongonense Type I via Homologous Recombination. Front Microbiol 2017; 8:2578. [PMID: 29326683 PMCID: PMC5742357 DOI: 10.3389/fmicb.2017.02578] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 12/11/2017] [Indexed: 11/13/2022] Open
Abstract
We recently showed that Mycobacterium yongonense could be divided into two genotypes: Type I, in which the rpoB gene has been transferred from Mycobacterium parascrofulaceum, and Type II, in which the rpoB gene has not been transferred. Comparative genome analysis of three M. yongonense Type I, two M. yongonense Type II and M. parascrofulaceum type strains were performed in this study to gain insight into gene transfer from M. parascrofulaceum into M. yongonense Type I strains. We found two genome regions transferred from M. parascrofulaceum: one contained 3 consecutive genes, including the rpoBC operon, and the other contained 57 consecutive genes that had been transferred into M. yongonense Type I genomes via homologous recombination. Further comparison between the M. yongonense Type I and II genomes revealed that Type I, but not Type II has a distinct DNA mismatch repair gene (MutS4 subfamily) that was possibly transferred via non-homologous recombination from other actinomycetes. We hypothesized that it could facilitate homologous recombination from the M. parascrofulaceum to the M. yongonense Type I genomes. We therefore generated recombinant Mycobacterium smegmatis containing a MutS4 operon of M. yongonense. We found that the M. tuberculosis rpoB fragment with a rifampin resistance-conferring mutation was more frequently inserted into recombinant M. smegmatis than the wild type, suggesting that MutS4 is a driving force in the gene transfer from M. parascrofulaceum to M. yongonense Type I strains via homologous recombination. In conclusion, our data indicated that MutS4 in M. yongonense Type I genomes may drive gene transfer from M. parascrofulaceum via homologous recombination, resulting in division of M. yongonense into two genotypes, Type I and II.
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Affiliation(s)
- Byoung-Jun Kim
- Department of Microbiology and Immunology, Biomedical Sciences, Liver Research Institute and Cancer Research Institute, College of Medicine, Seoul National University, Seoul, South Korea
| | - Bo-Ram Kim
- Department of Microbiology and Immunology, Biomedical Sciences, Liver Research Institute and Cancer Research Institute, College of Medicine, Seoul National University, Seoul, South Korea
| | - Yoon-Hoh Kook
- Department of Microbiology and Immunology, Biomedical Sciences, Liver Research Institute and Cancer Research Institute, College of Medicine, Seoul National University, Seoul, South Korea
| | - Bum-Joon Kim
- Department of Microbiology and Immunology, Biomedical Sciences, Liver Research Institute and Cancer Research Institute, College of Medicine, Seoul National University, Seoul, South Korea
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Kim BJ, Kim BR, Lee SY, Kim GN, Kook YH, Kim BJ. Molecular Taxonomic Evidence for Two Distinct Genotypes of Mycobacterium yongonense via Genome-Based Phylogenetic Analysis. PLoS One 2016; 11:e0152703. [PMID: 27031100 PMCID: PMC4816341 DOI: 10.1371/journal.pone.0152703] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 03/17/2016] [Indexed: 12/30/2022] Open
Abstract
Recently, we introduced a distinct Mycobacterium intracellulare INT-5 genotype, distantly related to other genotypes of M. intracellulare (INT-1 to -4). The aim of this study is to determine the exact taxonomic status of the M. intracellulare INT-5 genotype via genome-based phylogenetic analysis. To this end, genome sequences of the two INT-5 strains, MOTT-H4Y and MOTT-36Y were compared with M. intracellulare ATCC 13950T and Mycobacterium yongonense DSM 45126T. Our phylogenetic analysis based on complete genome sequences, multi-locus sequence typing (MLST) of 35 target genes, and single nucleotide polymorphism (SNP) analysis indicated that the two INT-5 strains were more closely related to M. yongonense DSM 45126T than the M. intracellulare strains. These results suggest their taxonomic transfer from M. intracellulare into M. yongonense. Finally, we selected 5 target genes (argH, dnaA, deaD, hsp65, and recF) and used SNPs for the identification of M. yongonese strains from other M. avium complex (MAC) strains. The application of the SNP analysis to 14 MAC clinical isolates enabled the selective identification of 4 M. yongonense clinical isolates from the other MACs. In conclusion, our genome-based phylogenetic analysis showed that the taxonomic status of two INT-5 strains, MOTT-H4Y and MOTT-36Y should be revised into M. yongonense. Our results also suggest that M. yongonense could be divided into 2 distinct genotypes (the Type I genotype with the M. parascrofulaceum rpoB gene and the Type II genotype with the M. intracellulare rpoB gene) depending on the presence of the lateral gene transfer of rpoB from M. parascrofulaceum.
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Affiliation(s)
- Byoung-Jun Kim
- Department of Biomedical Sciences, Microbiology and Immunology, Cancer Research Institute, Institute of Endemic Diseases, and Seoul National University Medical Research Center (SNUMRC), Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Bo-Ram Kim
- Department of Biomedical Sciences, Microbiology and Immunology, Cancer Research Institute, Institute of Endemic Diseases, and Seoul National University Medical Research Center (SNUMRC), Seoul National University College of Medicine, Seoul, Republic of Korea
| | - So-Young Lee
- Department of Biomedical Sciences, Microbiology and Immunology, Cancer Research Institute, Institute of Endemic Diseases, and Seoul National University Medical Research Center (SNUMRC), Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Ga-Na Kim
- Department of Biomedical Sciences, Microbiology and Immunology, Cancer Research Institute, Institute of Endemic Diseases, and Seoul National University Medical Research Center (SNUMRC), Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Yoon-Hoh Kook
- Department of Biomedical Sciences, Microbiology and Immunology, Cancer Research Institute, Institute of Endemic Diseases, and Seoul National University Medical Research Center (SNUMRC), Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Bum-Joon Kim
- Department of Biomedical Sciences, Microbiology and Immunology, Cancer Research Institute, Institute of Endemic Diseases, and Seoul National University Medical Research Center (SNUMRC), Seoul National University College of Medicine, Seoul, Republic of Korea
- * E-mail:
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