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Garciglia-Mercado C, Contreras CA, Choix FJ, de-Bashan LE, Gómez-Anduro GA, Palacios OA. Metabolic and physiological adaptations of microalgal growth-promoting bacterium Azospirillum brasilense growing under biogas atmosphere: a microarray-based transcriptome analysis. Arch Microbiol 2024; 206:173. [PMID: 38492040 DOI: 10.1007/s00203-024-03890-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 01/30/2024] [Accepted: 02/08/2024] [Indexed: 03/18/2024]
Abstract
Using microalgal growth-promoting bacteria (MGPB) to improve the cultured microalga metabolism during biotechnological processes is one of the most promising strategies to enhance their benefits. Nonetheless, the culture condition effect used during the biotechnological process on MGPB growth and metabolism is key to ensure the expected positive bacterium growth and metabolism of microalgae. In this sense, the present research study investigated the effect of the synthetic biogas atmosphere (75% CH4-25% CO2) on metabolic and physiological adaptations of the MGPB Azospirillum brasilense by a microarray-based transcriptome approach. A total of 394 A. brasilense differentially expressed genes (DEGs) were found: 201 DEGs (34 upregulated and 167 downregulated) at 24 h and 193 DEGs (140 upregulated and 53 downregulated) under the same conditions at 72 h. The results showed a series of A. brasilense genes regulating processes that could be essential for its adaptation to the early stressful condition generated by biogas. Evidence of energy production is shown by nitrate/nitrite reduction and activation of the hypothetical first steps of hydrogenotrophic methanogenesis; signal molecule modulation is observed: indole-3-acetic acid (IAA), riboflavin, and vitamin B6, activation of Type VI secretion system responding to IAA exposure, as well as polyhydroxybutyrate (PHB) biosynthesis and accumulation. Moreover, an overexpression of ipdC, ribB, and phaC genes, encoding the key enzymes for the production of the signal molecule IAA, vitamin riboflavin, and PHB production of 2, 1.5 and 11 folds, respectively, was observed at the first 24 h of incubation under biogas atmosphere Overall, the ability of A. brasilense to metabolically adapt to a biogas atmosphere is demonstrated, which allows its implementation for generating biogas with high calorific values and the use of renewable energies through microalga biotechnologies.
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Affiliation(s)
| | - Claudia A Contreras
- Facultad de Ciencias Químicas, Universidad Autónoma de Chihuahua, Chihuahua, Mexico
| | - Francisco J Choix
- Facultad de Ciencias Químicas, Universidad Autónoma de Chihuahua, Chihuahua, Mexico
- CONAHCYT-Universidad Autónoma de Chihuahua, Chihuahua, Mexico
| | - Luz E de-Bashan
- The Bashan Institute of Science, Auburn, AL, USA
- Departament of Entomology and Plant Pathology, Auburn University, Auburn, AL, USA
| | | | - Oskar A Palacios
- Facultad de Ciencias Químicas, Universidad Autónoma de Chihuahua, Chihuahua, Mexico.
- The Bashan Institute of Science, Auburn, AL, USA.
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Tian M, Li Z, Qu J, Fang T, Yin Y, Zuo D, Abdelgawad HA, Hu H, Wang S, Qi J, Wang G, Yu S. The novel LysR-family transcriptional regulator BvtR is involved in the resistance of Brucella abortus to nitrosative stress, detergents and virulence through the genetic regulation of diverse pathways. Vet Microbiol 2022; 267:109393. [PMID: 35259600 DOI: 10.1016/j.vetmic.2022.109393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 01/22/2022] [Accepted: 02/28/2022] [Indexed: 11/22/2022]
Abstract
Brucella is a facultative intracellular bacterium lacking classical virulence factors; its virulence instead depends on its ability to invade and proliferate within host cells. After entering cells, Brucella rapidly modulates the expression of a series of genes involved in metabolism and immune evasion. Here, a novel LysR-family transcriptional regulator, designated Brucellavirulence-related transcriptional regulator (BvtR), was found to be associated with Brucella abortus virulence. We first successfully constructed a BvtR mutant, ΔbvtR, and a complemented strain, ΔbvtR-Com. Subsequently, we performed cell infection experiments, which indicated that the ΔbvtR strain exhibited similar adhesion, invasion and survival within HeLa cells or RAW264.7 macrophages to those of the wild-type strain. In stress resistance tests, the ΔbvtR strain showed enhanced sensitivity to sodium nitroprusside and sodium dodecyl sulfate, but not to hydrogen peroxide, cumene hydroperoxide, polymyxin B and natural serum. Mouse infection experiments indicated that the virulence of the ΔbvtR strain significantly decreased at 4 weeks post-infection. Finally, we analyzed differentially expressed genes regulated by BvtR with RNA-seq, COG classification and KEGG pathway analysis. Nitrogen metabolism, siderophore biosynthesis and oligopeptide transport were found to be the predominantly altered functions, and key metabolic and regulatory networks were delineated in the ΔbvtR mutant. Thus, we identified a novel Brucella virulence-related regulator, BvtR, and demonstrated that BvtR regulation affects Brucella resistance to killing by sodium nitroprusside and sodium dodecyl sulfate. The differentially expressed genes responding to BvtR are involved in diverse functions or pathways in Brucella, thus, suggesting the breadth of BvtR's regulatory functions. This study provides novel clues regarding Brucella pathogenesis.
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Affiliation(s)
- Mingxing Tian
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Zichen Li
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Jing Qu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China; Songjiang District Center for Animal Disease Control and Prevention, Shanghai 201699, China
| | - Tian Fang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China; College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Yi Yin
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Dong Zuo
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Hosny Ahmed Abdelgawad
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Hai Hu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Shaohui Wang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Jingjing Qi
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Guijun Wang
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Shengqing Yu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China.
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Prevalence and Genomic Characterization of Brucella canis Strains Isolated from Kennels, Household, and Stray Dogs in Chile. Animals (Basel) 2020; 10:ani10112073. [PMID: 33182313 PMCID: PMC7695308 DOI: 10.3390/ani10112073] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Revised: 11/03/2020] [Accepted: 11/05/2020] [Indexed: 02/07/2023] Open
Abstract
Canine brucellosis caused by Brucella canis is a zoonotic disease that causes reproductive alterations in dogs, such as infertility, abortion, and epididymitis. This pathogen is especially prevalent in South America, and due to the lack of official control programs and the growing trend of adopting dogs it constitutes a public health risk that must be addressed. The aim of this study was to determine the prevalence of B. canis infection in kennel, shelter, and household dogs and to characterize the genomic properties of circulating strains, including ure and virB operons and omp25/31 genes. Samples from 771 dogs were obtained, and the infection was detected by blood culture and/or serology in 7.0% of the animals. The complete ure and virB operons and the omp25/31 genes were detected. Interestingly, we found different single-nucleotide polymorphisms (SNPs) in some of the analyzed genes, which could mean a change in the fitness or virulence of these strains. This study provides further evidence about dogs as a source of B. canis strains that can infect people. This also highlights the need to implement official control programs, including the mandatory testing of dogs, especially stray dogs, before adoption.
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Feng C, Zhang F, Wang B, Gao J, Wang Y, Shao Y. Evaluation of kanamycin and neomycin resistance in Lactobacillus plantarum using experimental evolution and whole-genome sequencing. Food Control 2019. [DOI: 10.1016/j.foodcont.2018.11.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Tian M, Qu J, Li P, Bao Y, Liu J, Ding C, Wang S, Li T, Qi J, Yu S. Identification of novel genes essential for Brucella abortus to establish infection by signature-tagged mutagenesis. Vet Microbiol 2019; 230:130-137. [PMID: 30827378 DOI: 10.1016/j.vetmic.2019.02.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2018] [Revised: 01/15/2019] [Accepted: 02/03/2019] [Indexed: 11/27/2022]
Abstract
Brucella is a facultative intracellular bacterium, causing brucellosis, an important zoonosis worldwide. Brucella has no classic virulence factors, thus virulence is dependent on invasion of host cells and subsequent intracellular replication. Identification of key genes involved in Brucella virulence is important to further elucidate its pathogenesis. In this study, signature-tagged mutagenesis was used to identify novel genes involved in B. abortus infection in a mouse model. In total 3600 mutants were obtained, of which 56 were identified as attenuated mutants. Furthermore, 53 genes were identified to be inactivated by transposon insertion, including 19 genes previously reported to be essential for Brucella virulence and 34 others that were newly identified in this study. These genes were catalogued into 16 functional classifications, except for three that were not cited in the Clusters of Orthologous Groups database. Bioinformatics analysis revealed that energy production and conversion, amino acid transport and metabolism, as well as inorganic ion transport and metabolism were predominant functional classifications, suggesting that genes involved in these functions were crucial for Brucella virulence. In addition, the function of the identified pyruvate carboxylase (pyc) gene in bacterial virulence was confirmed using an allelic replacement pyc mutant and a mouse model. These findings provide novel genetic information associated with Brucella infection.
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Affiliation(s)
- Mingxing Tian
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai, 200241, China
| | - Jing Qu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai, 200241, China
| | - Peng Li
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai, 200241, China
| | - Yanqing Bao
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai, 200241, China
| | - Jiameng Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai, 200241, China
| | - Chan Ding
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai, 200241, China
| | - Shaohui Wang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai, 200241, China
| | - Tao Li
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai, 200241, China
| | - Jingjing Qi
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai, 200241, China
| | - Shengqing Yu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai, 200241, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou, China.
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Tian M, Lian Z, Bao Y, Bao S, Yin Y, Li P, Ding C, Wang S, Li T, Qi J, Wang X, Yu S. Identification of a novel, small, conserved hypothetical protein involved inBrucella abortusvirulence by modifying the expression of multiple genes. Transbound Emerg Dis 2018; 66:349-362. [DOI: 10.1111/tbed.13028] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 09/05/2018] [Accepted: 09/21/2018] [Indexed: 12/26/2022]
Affiliation(s)
- Mingxing Tian
- Shanghai Veterinary Research Institute Chinese Academy of Agricultural Sciences (CAAS) Shanghai China
| | - Zhengmin Lian
- China College of Veterinary Medicine Gansu Agricultural University LanzhouChina
| | - Yanqing Bao
- Shanghai Veterinary Research Institute Chinese Academy of Agricultural Sciences (CAAS) Shanghai China
| | - Shijun Bao
- China College of Veterinary Medicine Gansu Agricultural University LanzhouChina
| | - Yi Yin
- Shanghai Veterinary Research Institute Chinese Academy of Agricultural Sciences (CAAS) Shanghai China
| | - Peng Li
- Shanghai Veterinary Research Institute Chinese Academy of Agricultural Sciences (CAAS) Shanghai China
| | - Chan Ding
- Shanghai Veterinary Research Institute Chinese Academy of Agricultural Sciences (CAAS) Shanghai China
| | - Shaohui Wang
- Shanghai Veterinary Research Institute Chinese Academy of Agricultural Sciences (CAAS) Shanghai China
| | - Tao Li
- Shanghai Veterinary Research Institute Chinese Academy of Agricultural Sciences (CAAS) Shanghai China
| | - Jingjing Qi
- Shanghai Veterinary Research Institute Chinese Academy of Agricultural Sciences (CAAS) Shanghai China
| | - Xiaolan Wang
- Shanghai Veterinary Research Institute Chinese Academy of Agricultural Sciences (CAAS) Shanghai China
| | - Shengqing Yu
- Shanghai Veterinary Research Institute Chinese Academy of Agricultural Sciences (CAAS) Shanghai China
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