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Lemons JMS, Narrowe AB, Liu L, Firrman J, Mahalak KK, Van den Abbeele P, Baudot A, Deyaert S, Li Y, Yu L(L. Impact of Baizhu, Daqingye, and Hehuanhua extracts on the human gut microbiome. Front Cell Infect Microbiol 2023; 13:1298392. [PMID: 38145049 PMCID: PMC10740150 DOI: 10.3389/fcimb.2023.1298392] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 11/23/2023] [Indexed: 12/26/2023] Open
Abstract
Introduction In traditional Chinese medicine, the rhizome of Atractylodes macrocephala (Baizhu), the leaves of Isatis indigotica (Daqingye), and the flowers of Albizia julibrissin (Hehuanhua) have been used to treat gastrointestinal illnesses, epidemics, and mental health issues. Modern researchers are now exploring the underlying mechanisms responsible for their efficacy. Previous studies often focused on the impact of purified chemicals or mixed extracts from these plants on cells in tissue culture or in rodent models. Methods As modulation of the human gut microbiome has been linked to host health status both within the gastrointestinal tract and in distant tissues, the effects of lipid-free ethanol extracts of Baizhu, Daqingye, and Hehuanhua on the human adult gut microbiome were assessed using Systemic Intestinal Fermentation Research (SIFR®) technology (n=6). Results and discussion Baizhu and Daqingye extracts similarly impacted microbial community structure and function, with the extent of effects being more pronounced for Baizhu. These effects included decreases in the Bacteroidetes phylum and increases in health-related Bifidobacterium spp. and short chain fatty acids which may contribute to Baizhu's efficacy against gastrointestinal ailments. The changes upon Hehuanhua treatment were larger and included increases in multiple bacterial species, including Agathobaculum butyriciproducens, Adlercreutzia equolifaciens, and Gordonibacter pamelaeae, known to produce secondary metabolites beneficial to mental health. In addition, many of the changes induced by Hehuanhua correlated with a rise in Enterobacteriaceae spp., which may make the tested dose of this herb contraindicated for some individuals. Overall, there is some evidence to suggest that the palliative effect of these herbs may be mediated, in part, by their impact on the gut microbiome, but more research is needed to elucidate the exact mechanisms.
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Affiliation(s)
- Johanna M. S. Lemons
- United States Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Dairy and Functional Foods Research Unit, Wyndmoor, PA, United States
| | - Adrienne B. Narrowe
- United States Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Dairy and Functional Foods Research Unit, Wyndmoor, PA, United States
| | - LinShu Liu
- United States Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Dairy and Functional Foods Research Unit, Wyndmoor, PA, United States
| | - Jenni Firrman
- United States Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Dairy and Functional Foods Research Unit, Wyndmoor, PA, United States
| | - Karley K. Mahalak
- United States Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Dairy and Functional Foods Research Unit, Wyndmoor, PA, United States
| | | | | | | | - Yanfang Li
- Department of Nutrition and Food Science, 0112 Skinner Building University of Maryland, College Park, MD, United States
| | - Liangli (Lucy) Yu
- Department of Nutrition and Food Science, 0112 Skinner Building University of Maryland, College Park, MD, United States
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Wang Z, Guo M, Li J, Jiang C, Yang S, Zheng S, Li M, Ai X, Xu X, Zhang W, He X, Wang Y, Chen Y. Composition and functional profiles of gut microbiota reflect the treatment stage, severity, and etiology of acute pancreatitis. Microbiol Spectr 2023; 11:e0082923. [PMID: 37698429 PMCID: PMC10580821 DOI: 10.1128/spectrum.00829-23] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Accepted: 07/13/2023] [Indexed: 09/13/2023] Open
Abstract
Acute pancreatitis (AP) is a type of digestive system disease with high mortality. Previous studies have shown that gut microbiota can participate in developing and treating acute pancreatitis by affecting the host's metabolism. In this study, we followed 20 AP patients to generate longitudinal gut microbiota profiles and activity during disease (before treatment, on the third day of treatment, and 1 month after discharge). We analyzed species composition and metabolic pathways' changes across the treatment phase, severity, and etiology. The diversity of the gut microbiome of patients with AP did not show much variation with treatment. In contrast, the metabolic functions of the gut microbiota, such as the essential chemical reactions that produce energy and maintain life, were partially reinstated after treatment. The severe AP (SAP) patients contained less beneficial bacteria (i.e., Bacteroides xylanisolvens, Clostridium lavalense, and Roseburia inulinivorans) and weaker sugar degradation function than mild AP patients before treatment. Moreover, etiology was one of the drivers of gut microbiome composition and explained the 3.54% variation in species' relative abundance. The relative abundance of pathways related to lipid synthesis was higher in the gut of hyperlipidemia AP patients than in biliary AP patients. The composition and functional profiles of the gut microbiota reflect the severity and etiology of AP. Otherwise, we also identified bacterial species associated with SAP, i.e., Oscillibacter sp. 57_20, Parabacteroides johnsonii, Bacteroides stercoris, Methanobrevibacter smithii, Ruminococcus lactaris, Coprococcus comes, and Dorea formicigenerans, which have the potential to identify the SAP at an early stage. IMPORTANCE Acute pancreatitis (AP) is a type of digestive system disease with high mortality. Previous studies have shown that gut microbiota can participate in the development and treatment of acute pancreatitis by affecting the host's metabolism. However, fewer studies acquired metagenomic sequencing data to associate species to functions intuitively and performed longitudinal analysis to explore how gut microbiota influences the development of AP. We followed 20 AP patients to generate longitudinal gut microbiota profiles and activity during disease and studied the differences in intestinal flora under different severities and etiologies. We have two findings. First, the gut microbiota profile has the potential to identify the severity and etiology of AP at an early stage. Second, gut microbiota likely acts synergistically in the development of AP. This study provides a reference for characterizing the driver flora of severe AP to identify the severity of acute pancreatitis at an early stage.
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Affiliation(s)
- Zhenjiang Wang
- Department of Gastroenterology, Zhuhai Hospital Affiliated with Jinan University (Zhuhai People’s Hospital), Zhuhai, China
| | - Mingyi Guo
- Department of Gastroenterology, Zhuhai Hospital Affiliated with Jinan University (Zhuhai People’s Hospital), Zhuhai, China
| | - Jing Li
- School of Management, University of Science and Technology of China, Hefei, Anhui, China
- Department of Research and Development, Shenzhen Byoryn Technology Co., Ltd., Shenzhen, China
| | - Chuangming Jiang
- Department of Gastroenterology, Gaolangang Branch of Zhuhai People’s Hospital (Hospital of Gaolangang), Zhuhai, China
| | - Sen Yang
- Department of Gastroenterology, Zhuhai Hospital Affiliated with Jinan University (Zhuhai People’s Hospital), Zhuhai, China
| | - Shizhuo Zheng
- Department of Gastroenterology, Zhuhai Hospital Affiliated with Jinan University (Zhuhai People’s Hospital), Zhuhai, China
| | - Mingzhe Li
- College of Medicine and Biological Information Engineering, Northeastern University, Shenyang, China
| | - Xinbo Ai
- Department of Gastroenterology, Zhuhai Hospital Affiliated with Jinan University (Zhuhai People’s Hospital), Zhuhai, China
| | - Xiaohong Xu
- Department of Gastroenterology, Zhuhai Hospital Affiliated with Jinan University (Zhuhai People’s Hospital), Zhuhai, China
| | - Wenbo Zhang
- College of Medicine and Biological Information Engineering, Northeastern University, Shenyang, China
| | - Xingxiang He
- Department of Gastroenterology, The First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Yinan Wang
- Department of Obstetrics and Gynecology, Peking University Shenzhen Hospital, Shenzhen, China
| | - Yuping Chen
- Department of Gastroenterology, Zhuhai Hospital Affiliated with Jinan University (Zhuhai People’s Hospital), Zhuhai, China
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3
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Update on Accepted Novel Bacterial Isolates Derived from Human Clinical Specimens and Taxonomic Revisions Published in 2020 and 2021. J Clin Microbiol 2023; 61:e0028222. [PMID: 36533910 PMCID: PMC9879126 DOI: 10.1128/jcm.00282-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
A number of factors, including microbiome analyses and the increased utilization of whole-genome sequencing in the clinical microbiology laboratory, has contributed to the explosion of novel prokaryotic species discovery, as well as bacterial taxonomy revision. This review attempts to summarize such changes relative to human clinical specimens that occurred in 2020 and 2021, per primary publication in the International Journal of Systematic and Evolutionary Microbiology or acceptance on Validation Lists published by the International Journal of Systematic and Evolutionary Microbiology. Of particular significance among valid and effectively published taxa within the past 2 years were novel Corynebacterium spp., coagulase-positive staphylococci, Pandoraea spp., and members of family Yersiniaceae. Noteworthy taxonomic revisions include those within the Bacillus and Lactobacillus genera, family Staphylococcaceae (including unifications of subspecies designations to species level taxa), Elizabethkingia spp., and former members of Clostridium spp. and Bacteroides spp. Revisions within the Brucella genus have the potential to cause deleterious effects unless the relevance of such changes is properly communicated by microbiologists to stakeholders in clinical practice, infection prevention, and public health.
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Li Q, Shen T, Dong Y, Liu Y, Nong J, Pan J, Fu B, Xie Q. Clostridium weizhouense sp. nov., an anaerobic bacterium isolated from activated sludge of petroleum wastewater. Int J Syst Evol Microbiol 2022; 72. [DOI: 10.1099/ijsem.0.005330] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A Gram-stain-positive, anaerobic, spore-forming, rod-shaped (0.4–0.6 µm×2.5–3.2 µm), flagellated bacterium, designated strain YB-6T, was isolated from activated sludge of an anaerobic tank at Weizhou marine oil mining wastewater treatment plant in Beihai, Guangxi, PR China. The culture conditions were 25–45 °C (optimum, 37 °C), pH 4–12 (pH 7.0) and NaCl concentration of 0–7 % w/v (0%). Strain YB-6T grew slowly in petroleum wastewater and removed 68.2 % of the total organic carbon in petroleum wastewater within 10 days. Concentrations of naphthalene, anthracene and phenanthrene at an initial concentration of 50 mg l−1 were reduced by 32.8, 40.4 and 14.6 %, respectively, after 7 days. Phylogenetic analysis of the 16S rRNA gene sequence indicated that strain YB-6T belongs to
Clostridium
cluster I and is most closely related to
Clostridium uliginosum
CK55T (98.5 % similarity). The genome size of strain YB-6T was 3.96 Mb, and the G+C content was 26.5 mol%. The average nucleotide identity value between strain YB-6T and
C. uliginosum
CK55T was 81.9 %. The major fatty acids in strain YB-6T were C14 : 0 FAME, C16 : 0 FAME and summed feature 4 (unknown 14.762 and/or C15 : 2 FAME). The main polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, five unidentified aminophospholipids, one unidentified glycolipid and one unidentified aminolipid. Diaminopimelic acid was not detected in the strain YB-6T cell walls. Whole-cell sugars mainly consisted of ribose and galactose. Based on the results of phenotypic and genotypic analyses, strain YB-6T represents a novel species of the genus
Clostridium
, for which the name Clostridium weizhouense sp. nov. is proposed. The type strain is YB-6T (=GDMCC 1.2529T=JCM 34754T).
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Affiliation(s)
- Qing Li
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, PR China
| | - Taiming Shen
- The Guangxi Key Laboratory of Theory and Technologyfor Environmental Pollution Control, Guilin 541004, PR China
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, PR China
| | - Yingying Dong
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, PR China
| | - Yuhui Liu
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, PR China
| | - Jieliang Nong
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, PR China
| | - Jiayuan Pan
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, PR China
| | - Bei Fu
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, PR China
| | - Qinglin Xie
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, PR China
- The Guangxi Key Laboratory of Theory and Technologyfor Environmental Pollution Control, Guilin 541004, PR China
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5
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Dubreuil L, Jehl F, Cattoen C, Bonnet R, Bru J, Caron F, Cattoir V, Courvalin P, Jarlier V, Lina G, Merens A, Plesiat P, Marie-Cécile P, Soussy CJ, Varon E, Weber P. Improvement of a disk diffusion method for antibiotic susceptibility testing of anaerobic bacteria. French recommendations revisited for 2020. Anaerobe 2020; 64:102213. [DOI: 10.1016/j.anaerobe.2020.102213] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 05/11/2020] [Accepted: 05/12/2020] [Indexed: 01/10/2023]
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6
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Liu L, Jiao JY, Fang BZ, Lv AP, Ming YZ, Li MM, Salam N, Li WJ. Isolation of Clostridium from Yunnan-Tibet hot springs and description of Clostridium thermarum sp. nov. with lignocellulosic ethanol production. Syst Appl Microbiol 2020; 43:126104. [PMID: 32847779 DOI: 10.1016/j.syapm.2020.126104] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 06/06/2020] [Accepted: 06/12/2020] [Indexed: 11/27/2022]
Abstract
Lignocellulose is considered a major source of renewable energy that serve as an alternative to the fossil fuels. Members of the genus Clostridium are some of the many microorganisms that have the ability to degrade lignocellulose efficiently to sugar, which can be further converted to biofuel. In this study, we isolated twelve Clostridium strains from hot spring samples of Yunnan and Tibet, of which isolates SYSU GA15002T and SYSU GA17076 showed low 16S rRNA gene sequence identity profiles to any of the validly named Clostridium strains (<94.0%). Studies using a polyphasic taxonomy approach concluded that the two isolates represent one novel species of the genus Clostridium, for which we propose the name Clostridium thermarum sp. nov., with SYSU GA15002T as the type strain of the species. Isolate SYSU GA15002T has an optimum growth temperature at 45°C. Fermentation of the substrates cellobiose, cellulose, xylan and untreated straw powder by this strain results in the production of ethanol, along with acetate and formate. The complete pathways for the conversion of cellulose and xylan to ethanol is also predicted from the genome of isolate SYSU GA15002T, which revealed a single step conversion of lignocellulosic biomass through consolidated bioprocessing. This paper is a comprehensive study encompassing isolation, polyphasic taxonomy, lignocellulose biodegradation and the genomic information of Clostridium in Yunnan-Tibet hot springs.
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Affiliation(s)
- Lan Liu
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Jian-Yu Jiao
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Bao-Zhu Fang
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Ai-Ping Lv
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Yu-Zhen Ming
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Meng-Meng Li
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Nimaichand Salam
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China.
| | - Wen-Jun Li
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China.
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7
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Holm JB, France MT, Ma B, McComb E, Robinson CK, Mehta A, Tallon LJ, Brotman RM, Ravel J. Comparative Metagenome-Assembled Genome Analysis of " Candidatus Lachnocurva vaginae", Formerly Known as Bacterial Vaginosis-Associated Bacterium-1 (BVAB1). Front Cell Infect Microbiol 2020; 10:117. [PMID: 32296647 PMCID: PMC7136613 DOI: 10.3389/fcimb.2020.00117] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 03/02/2020] [Indexed: 01/07/2023] Open
Abstract
Bacterial vaginosis-associated bacterium 1 (BVAB1) is an as-yet uncultured bacterial species found in the human vagina that belongs to the family Lachnospiraceae within the order Clostridiales. As its name suggests, this bacterium is often associated with bacterial vaginosis (BV), a common vaginal disorder that has been shown to increase a woman's risk for HIV, Chlamydia trachomatis, and Neisseria gonorrhoeae infections as well as preterm birth. BVAB1 has been further associated with the persistence of BV following metronidazole treatment, increased vaginal inflammation, and adverse obstetrics outcomes. There is no available complete genome sequence of BVAB1, which has made it difficult to mechanistically understand its role in disease. We present here a circularized metagenome-assembled genome (cMAG) of BVAB1 as well as a comparative analysis including an additional six metagenome-assembled genomes (MAGs) of this species. These sequences were derived from cervicovaginal samples of seven separate women. The cMAG was obtained from a metagenome sequenced with long-read technology on a PacBio Sequel II instrument while the others were derived from metagenomes sequenced on the Illumina HiSeq platform. The cMAG is 1.649 Mb in size and encodes 1,578 genes. We propose to rename BVAB1 to "Candidatus Lachnocurva vaginae" based on phylogenetic analyses, and provide genomic and metabolomic evidence that this candidate species may metabolize D-lactate, produce trimethylamine (one of the chemicals responsible for BV-associated odor), and be motile. The cMAG and the six MAGs are valuable resources that will further contribute to our understanding of the heterogeneous etiology of bacterial vaginosis.
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Affiliation(s)
- Johanna B. Holm
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Michael T. France
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Bing Ma
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Elias McComb
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Courtney K. Robinson
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Aditya Mehta
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Luke J. Tallon
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Rebecca M. Brotman
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
- Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Jacques Ravel
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, United States
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8
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Haas KN, Blanchard JL. Reclassification of the Clostridium clostridioforme and Clostridium sphenoides clades as Enterocloster gen. nov. and Lacrimispora gen. nov., including reclassification of 15 taxa. Int J Syst Evol Microbiol 2020; 70:23-34. [DOI: 10.1099/ijsem.0.003698] [Citation(s) in RCA: 101] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Affiliation(s)
- Kelly N. Haas
- Department of Biology, California State University Sacramento, Sacramento, California, USA
- Department of Dermatology, University of California Davis Medical Center, Sacramento, California, USA
| | - Jeffrey L. Blanchard
- Department of Biology, University of Massachusetts, Amherst, Massachusetts, USA
- Graduate Program in Organismal and Evolutionary Biology, University of Massachusetts, Amherst, Massachusetts, USA
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Clostridium indicum sp. nov., a novel anaerobic bacterium isolated from the sludge of an industrial effluent. Int J Syst Evol Microbiol 2019; 69:672-678. [DOI: 10.1099/ijsem.0.003199] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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10
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Hong W, Cheng Y, Rao F, Yang J, Cui G, Chen Z, Liao J, Huang X, Zhang J, Wang P, Wang S, Wang Y, Guan Z, Qi X. Co-infection of Clostridioides (Clostridium) difficile GMU1 and Bacillus cereus GMU2 in one patient in Guizhou, China. Anaerobe 2018; 54:159-163. [PMID: 30273671 DOI: 10.1016/j.anaerobe.2018.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Revised: 08/02/2018] [Accepted: 08/12/2018] [Indexed: 01/05/2023]
Abstract
Clostridioides (Clostridium) difficile and Bacillus cereus infections are frequently reported in human individually. However, co-infection of both pathogens in human is extremely rare. In the present study, we reported a case of human enteric disease caused by co-infection of C. difficile and B. cereus in Guizhou, China. The 16S rDNA sequencing result showed that C. difficile GMU1 and B. cereus GMU2 were most related to C. difficile ATCC 9689 and B. cereus ATCC 14579. The toxin genotype of C. difficile GMU1 and B. cereus GMU2 were tcdA+tcdB+tcdC+ and bceT+nheA+nheB+nheC+, respectively. Cytotoxicity assay demonstrated that C. difficile GMU1 produced significantly higher toxin B compare to C. difficile 630 stain. In contrast, B. cereus GMU2 has comparable NheA toxin productivity compare to previous report. The antimicrobial susceptibility test showed that the combination of ampicillin and vancomycin was most efficient to inhibit both C. difficile GMU1 and B. cereus GMU2.
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Affiliation(s)
- Wei Hong
- Key Laboratory of Endemic and Ethnic Diseases, Guizhou Medical University, Ministry of Education, Guiyang, 550004, China; Key Laboratory of Medical Molecular Biology, Guizhou Medical University, Guiyang, 550004, China.
| | - Yumei Cheng
- Department of Critical Care Medicine, The Affiliate Hospital of Guizhou Medical University, Guiyang, 550004, China
| | - Fengqin Rao
- Key Laboratory of Endemic and Ethnic Diseases, Guizhou Medical University, Ministry of Education, Guiyang, 550004, China; Key Laboratory of Medical Molecular Biology, Guizhou Medical University, Guiyang, 550004, China
| | - Jing Yang
- Guiyang Maternal and Child Health Hospital, Guiyang, 550004, China
| | - Guzhen Cui
- School of Basic Medical Science, Guizhou Medical University, Guiyang, 550025, China
| | - Zhenghong Chen
- School of Basic Medical Science, Guizhou Medical University, Guiyang, 550025, China
| | - Jian Liao
- Key Laboratory of Endemic and Ethnic Diseases, Guizhou Medical University, Ministry of Education, Guiyang, 550004, China; Key Laboratory of Medical Molecular Biology, Guizhou Medical University, Guiyang, 550004, China
| | - Xiaolin Huang
- Key Laboratory of Endemic and Ethnic Diseases, Guizhou Medical University, Ministry of Education, Guiyang, 550004, China; Key Laboratory of Medical Molecular Biology, Guizhou Medical University, Guiyang, 550004, China
| | - Jie Zhang
- Department of Biosystems Engineering, Auburn University, Auburn, AL, 36849, USA
| | - Pixiang Wang
- Department of Biosystems Engineering, Auburn University, Auburn, AL, 36849, USA
| | - Shaohua Wang
- Department of Biosystems Engineering, Auburn University, Auburn, AL, 36849, USA
| | - Yi Wang
- Department of Biosystems Engineering, Auburn University, Auburn, AL, 36849, USA
| | - Zhizhong Guan
- Key Laboratory of Endemic and Ethnic Diseases, Guizhou Medical University, Ministry of Education, Guiyang, 550004, China; Key Laboratory of Medical Molecular Biology, Guizhou Medical University, Guiyang, 550004, China
| | - Xiaolan Qi
- Key Laboratory of Endemic and Ethnic Diseases, Guizhou Medical University, Ministry of Education, Guiyang, 550004, China; Key Laboratory of Medical Molecular Biology, Guizhou Medical University, Guiyang, 550004, China.
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11
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Lee SM, Kim N, Yoon H, Nam RH, Lee DH. Microbial Changes and Host Response in F344 Rat Colon Depending on Sex and Age Following a High-Fat Diet. Front Microbiol 2018; 9:2236. [PMID: 30298061 PMCID: PMC6160749 DOI: 10.3389/fmicb.2018.02236] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 09/03/2018] [Indexed: 12/14/2022] Open
Abstract
Gut microbiota, an important component that affects host health, change rapidly and directly in response to altered diet composition. Recently, the role of diet–microbiome interaction on the development of colon cancer has been the focus of interest. Colon cancer occurs more frequently in an aged population, and in males. However, the effect of dietary changes on the gut microbiome has been studied mainly in young males, even though it may vary with age and sex. The aim of this study was to investigate microbial changes and host response in the colons of male and female 6-week-old (young) and 2-year-old (old) Fisher-344 rats exposed to a high-fat diet (HFD). Our results showed that exposure to HFD for 8 weeks decreased the species richness of microbiota (Chao1) and increased Firmicutes/Bacteroidetes ratio only in aged rats, and not in young rats. Sex differences underlying the alteration by HFD in the gut microbiome were observed in the microbiome of aged rats. For instance, the abundance ratio of Akkermansia muciniphila and Desulfovibrio spp. increased in response to HFD in young rats and female aged rats, but not in male aged rats. Histological inflammation and cell proliferation of colon mucosa (indexed by Ki67) were significantly increased by HFD even in young rats; aged rats showed significantly higher cell proliferation in the HFD group than in the control. The HFD-induced decrease of species richness and the increase in specific species (Desulfovibrio spp. and Clostridium lavalense), which produce carcinogenic compounds such as H2S and N-nitroso compounds, were significantly correlated with Ki67 index. In colon mucosa, the concentration of myeloperoxidase was increased by HFD only in males, and not in females. In conclusion, the results suggest a link between HFD-induced gut dysbiosis (particularly the low species richness and high abundance ratios of Desulfovibrio spp. and C. lavalense) and cell proliferation of colon mucosa (indicated by Ki67 IHC). In addition, sex differences influence the response of gut microbiome to HFD particularly in old age. Such sex differences in the gut microbiota might be related to sex differences in inflammation in the colon mucosa.
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Affiliation(s)
- Sun Min Lee
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Nayoung Kim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea.,Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea.,Tumor Microenvironment Global Core Research Center, College of Pharmacy, Seoul National University, Seoul, South Korea
| | - Hyuk Yoon
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Ryoung Hee Nam
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Dong Ho Lee
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea.,Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea.,Tumor Microenvironment Global Core Research Center, College of Pharmacy, Seoul National University, Seoul, South Korea
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12
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Kusada H, Kameyama K, Meng XY, Kamagata Y, Tamaki H. Fusimonas intestini gen. nov., sp. nov., a novel intestinal bacterium of the family Lachnospiraceae associated with diabetes in mice. Sci Rep 2017; 7:18087. [PMID: 29273795 PMCID: PMC5741734 DOI: 10.1038/s41598-017-18122-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 12/06/2017] [Indexed: 12/19/2022] Open
Abstract
Our previous study shows that an anaerobic intestinal bacterium strain AJ110941P contributes to type 2 diabetes development in mice. Here we phylogenetically and physiologically characterized this unique mouse gut bacterium. The 16S rRNA gene analysis revealed that the strain belongs to the family Lachnospiraceae but shows low sequence similarities ( < 92.5%) to valid species, and rather formed a distinct cluster with uncultured mouse gut bacteria clones. In metagenomic database survey, the 16S sequence of AJ110941P also matched with mouse gut-derived datasets (56% of total datasets) with > 99% similarity, suggesting that AJ110941P-related bacteria mainly reside in mouse digestive tracts. Strain AJ110941P shared common physiological traits (e.g., Gram-positive, anaerobic, mesophilic, and fermentative growth with carbohydrates) with relative species of the Lachnospiraceae. Notably, the biofilm-forming capacity was found in both AJ110941P and relative species. However, AJ110941P possessed far more strong ability to produce biofilm than relative species and formed unique structure of extracellular polymeric substances. Furthermore, AJ110941P cells are markedly long fusiform-shaped rods (9.0–62.5 µm) with multiple flagella that have never been observed in any other Lachnospiraceae members. Based on the phenotypic and phylogenetic features, we propose a new genus and species, Fusimonas intestini gen. nov., sp. nov. for strain AJ110941P (FERM BP-11443).
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Affiliation(s)
- Hiroyuki Kusada
- Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan
| | - Keishi Kameyama
- Frontier Research Laboratories, Institute for Innovation, Ajinomoto Co., Inc., 1-1 Suzuki-cho, Kawasaki, Kanagawa, 210-8681, Japan
| | - Xian-Ying Meng
- Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan
| | - Yoichi Kamagata
- Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan
| | - Hideyuki Tamaki
- Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan.
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13
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First isolation of Clostridium indolis in a patient with chronic osteitis: a case report and literature review of human infections related to Clostridium saccharolyticum group species. Anaerobe 2016; 42:44-49. [DOI: 10.1016/j.anaerobe.2016.08.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 08/03/2016] [Accepted: 08/05/2016] [Indexed: 01/13/2023]
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14
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Sex differences in colonization of gut microbiota from a man with short-term vegetarian and inulin-supplemented diet in germ-free mice. Sci Rep 2016; 6:36137. [PMID: 27796317 PMCID: PMC5086848 DOI: 10.1038/srep36137] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 10/11/2016] [Indexed: 12/18/2022] Open
Abstract
Gnotobiotic mouse model is generally used to evaluate the efficacy of gut microbiota. Sex differences of gut microbiota are acknowledged, yet the effect of recipient's gender on the bacterial colonization remains unclear. Here we inoculated male and female germ-free C57BL/6J mice with fecal bacteria from a man with short-term vegetarian and inulin-supplemented diet. We sequenced bacterial 16S rRNA genes V3-V4 region from donor's feces and recipient's colonic content. Shannon diversity index showed female recipients have higher bacteria diversity than males. Weighted UniFrac principal coordinates analysis revealed the overall structures of male recipient's gut microbiota were significantly separated from those of females, and closer to the donor. Redundancy analysis identified 46 operational taxonomic units (OTUs) differed between the sexes. The relative abundance of 13 OTUs were higher in males, such as Parabacteroides distasonis and Blautia faecis, while 33 OTUs were overrepresented in females, including Clostridium groups and Escherichia fergusonii/Shigella sonnei. Moreover, the interactions of these differential OTUs were sexually distinct. These findings demonstrated that the intestine of male and female mice preferred to accommodate microbiota differently. Therefore, it is necessary to designate the gender of gnotobiotic mice for complete evaluation of modulatory effects of gut microbiota from human feces upon diseases.
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15
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The Plasmidome of Firmicutes: Impact on the Emergence and the Spread of Resistance to Antimicrobials. Microbiol Spectr 2016; 3:PLAS-0039-2014. [PMID: 26104702 DOI: 10.1128/microbiolspec.plas-0039-2014] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The phylum Firmicutes is one of the most abundant groups of prokaryotes in the microbiota of humans and animals and includes genera of outstanding relevance in biomedicine, health care, and industry. Antimicrobial drug resistance is now considered a global health security challenge of the 21st century, and this heterogeneous group of microorganisms represents a significant part of this public health issue.The presence of the same resistant genes in unrelated bacterial genera indicates a complex history of genetic interactions. Plasmids have largely contributed to the spread of resistance genes among Staphylococcus, Enterococcus, and Streptococcus species, also influencing the selection and ecological variation of specific populations. However, this information is fragmented and often omits species outside these genera. To date, the antimicrobial resistance problem has been analyzed under a "single centric" perspective ("gene tracking" or "vehicle centric" in "single host-single pathogen" systems) that has greatly delayed the understanding of gene and plasmid dynamics and their role in the evolution of bacterial communities.This work analyzes the dynamics of antimicrobial resistance genes using gene exchange networks; the role of plasmids in the emergence, dissemination, and maintenance of genes encoding resistance to antimicrobials (antibiotics, heavy metals, and biocides); and their influence on the genomic diversity of the main Gram-positive opportunistic pathogens under the light of evolutionary ecology. A revision of the approaches to categorize plasmids in this group of microorganisms is given using the 1,326 fully sequenced plasmids of Gram-positive bacteria available in the GenBank database at the time the article was written.
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16
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First Report of Clostridium lavalenseIsolated in Human Blood Cultures. CANADIAN JOURNAL OF INFECTIOUS DISEASES AND MEDICAL MICROBIOLOGY 2016; 2016:7231805. [PMID: 27478446 PMCID: PMC4958426 DOI: 10.1155/2016/7231805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Revised: 04/27/2016] [Accepted: 05/19/2016] [Indexed: 11/18/2022]
Abstract
An 88-year-old man was admitted to the hospital with worsening malaise, fever, and weakness. Anaerobic blood culture bottles revealed the presence of an anaerobic, Gram-positive sporulated bacillus. Empirical antibiotherapy with intravenous piperacillin-tazobactam was initiated. The patient defervesced after four days and was switched to oral amoxicillin on his 6th day of antibiotic therapy and later discharged from the hospital. Four months later, he had recovered. The bacterium was initially identified as Clostridium butyricum using anaerobic manual identification panel. 16S rRNA gene sequence and phylogenetic analysis showed the bacterium to be Clostridium lavalense, a recently described species with no previously published case of isolation in human diagnostic samples so far. This is the first report of Clostridium lavalense isolation from human blood cultures. Further studies are needed in order to elucidate the role of Clostridium lavalense in human disease and its virulence factors.
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17
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Detection of Vancomycin-Resistant Enterococci. Mol Microbiol 2016. [DOI: 10.1128/9781555819071.ch18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Amir I, Bouvet P, Legeay C, Gophna U, Weinberger A. Eisenbergiella tayi gen. nov., sp. nov., isolated from human blood. Int J Syst Evol Microbiol 2014; 64:907-914. [DOI: 10.1099/ijs.0.057331-0] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
A catalase-positive, rod-shaped, non-proteolytic, non-motile, anaerobic bacterial strain, designated B086562T, was isolated from a blood culture of an 84-year-old male patient in Israel. According to 16S rRNA gene sequence phylogeny, this strain has no known close relatives among recognized bacteria but should be placed within the family
Lachnospiraceae
. The most closely related recognized bacteria were from the ‘
Clostridium clostridioforme
group’:
C. clostridioforme
(92.4 %) and
Clostridium bolteae
(92.3 %). The isolate produced butyrate, lactate, acetate and succinate as major metabolic end products. The major fatty acids were C16 : 0 and C18 : 1
cis 9 DMA and the DNA G+C content was 46.0 mol%. On the basis of the phenotypic properties and phylogenetic distinctiveness, the blood isolate represents a novel species of a new genus in the family
Lachnospiraceae
, for which the name Eisenbergiella tayi gen. nov., sp. nov. is proposed. The type strain of Eisenbergiella tayi is B086562T ( = LMG 27400T = DSM 26961T = ATCC BAA-2558T).
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Affiliation(s)
- Itay Amir
- Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, Tel-Aviv University, Ramat-Aviv, Tel-Aviv 69978, Israel
- The Microbiology Laboratory, Ma'ayanei Hayeshua Medical Center, Bnei-Brak 51544, Israel
| | - Philippe Bouvet
- Institut Pasteur, Centre National de Référence des Bactéries Anaérobies et du Botulisme, 25-28 rue du Docteur Roux, F-75724 Paris cedex 15, France
| | - Christine Legeay
- Institut Pasteur, Centre National de Référence des Bactéries Anaérobies et du Botulisme, 25-28 rue du Docteur Roux, F-75724 Paris cedex 15, France
| | - Uri Gophna
- Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, Tel-Aviv University, Ramat-Aviv, Tel-Aviv 69978, Israel
| | - Abraham Weinberger
- The Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, 69978, Israel
- Department of Internal Medicine, Ma'ayanei Hayeshua Medical Center, Bnei-Brak 51544, Israel
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Kaur S, Yawar M, Kumar PA, Suresh K. Hungatella effluvii gen. nov., sp. nov., an obligately anaerobic bacterium isolated from an effluent treatment plant, and reclassification of Clostridium hathewayi as Hungatella hathewayi gen. nov., comb. nov. Int J Syst Evol Microbiol 2013; 64:710-718. [PMID: 24186873 DOI: 10.1099/ijs.0.056986-0] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A Gram-stain-positive, rod-shaped, spore-forming and strictly anaerobic bacterium, designated UB-B.2(T), was isolated from an industrial effluent anaerobic digester sample. It grew optimally at 30 °C and pH 7.0. Comparative analysis of the 16S rRNA gene sequence confirmed that strain UB-B.2(T) was closely related to Clostridium hathewayi DSM 13479(T) (97.84% similarity), a member of rRNA gene cluster XIVa of the genus Clostridium, and formed a coherent cluster with other related members of the Blautia (Clostridium) coccoides rRNA group in phylogenetic analyses. The end products of glucose fermentation by strain UB-B.2(T) were acetate and propionate. The G+C content of the DNA was 51.4 mol%. Although strain UB-B.2(T) showed 97.8% 16S rRNA gene sequence identity to the type strain of C. hathewayi, it exhibited only 38.4% relatedness at the whole-genome level. It also showed differences from its closest phylogenetic relative, C. hathewayi DSM 13479(T), in phenotypic characteristics such as hydrolysis of aesculin, starch and urea and fermentation end products. Both strains showed phenotypic differences from the members of rRNA gene cluster XIVa of the genus Clostridium. Based on these differences, C. hathewayi DSM 13479(T) and strain UB-B.2(T) were identified as representatives of a new genus of the family Clostridiaceae. Thus, we propose the reclassification of Clostridium hathewayi as Hungatella hathewayi gen. nov., comb. nov., the type species of the new genus (type strain DSM 13479(T) = CCUG 43506(T) = MTCC 10951(T)). Strain UB-B.2(T) ( = MTCC 11101(T) = DSM 24995(T)) is assigned to the novel species Hungatella effluvii gen. nov., sp. nov as the type strain.
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Affiliation(s)
- Sukhpreet Kaur
- Microbial Type Culture Collection and Gene bank, CSIR Institute of Microbial Technology, Sector 39A, Chandigarh - 160 036, India
| | - Mir Yawar
- Microbial Type Culture Collection and Gene bank, CSIR Institute of Microbial Technology, Sector 39A, Chandigarh - 160 036, India
| | - P Anil Kumar
- Microbial Type Culture Collection and Gene bank, CSIR Institute of Microbial Technology, Sector 39A, Chandigarh - 160 036, India
| | - K Suresh
- Microbial Type Culture Collection and Gene bank, CSIR Institute of Microbial Technology, Sector 39A, Chandigarh - 160 036, India
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Yutin N, Galperin MY. A genomic update on clostridial phylogeny: Gram-negative spore formers and other misplaced clostridia. Environ Microbiol 2013; 15:2631-41. [PMID: 23834245 DOI: 10.1111/1462-2920.12173] [Citation(s) in RCA: 295] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The class Clostridia in the phylum Firmicutes (formerly low-G+C Gram-positive bacteria) includes diverse bacteria of medical, environmental and biotechnological importance. The Selenomonas-Megasphaera-Sporomusa branch, which unifies members of the Firmicutes with Gram-negative-type cell envelopes, was recently moved from Clostridia to a separate class Negativicutes. However, draft genome sequences of the spore-forming members of the Negativicutes revealed typically clostridial sets of sporulation genes. To address this and other questions in clostridial phylogeny, we have compared a phylogenetic tree for a concatenated set of 50 widespread ribosomal proteins with the trees for beta subunits of the RNA polymerase (RpoB) and DNA gyrase (GyrB) and with the 16S rRNA-based phylogeny. The results obtained by these methods showed remarkable consistency, suggesting that they reflect the true evolutionary history of these bacteria. These data put the Selenomonas-Megasphaera-Sporomusa group back within the Clostridia. They also support placement of Clostridium difficile and its close relatives within the family Peptostreptococcaceae; we suggest resolving the long-standing naming conundrum by renaming it Peptoclostridium difficile. These data also indicate the existence of a group of cellulolytic clostridia that belong to the family Ruminococcaceae. As a tentative solution to resolve the current taxonomical problems, we propose assigning 78 validly described Clostridium species that clearly fall outside the family Clostridiaceae to six new genera: Peptoclostridium, Lachnoclostridium, Ruminiclostridium, Erysipelatoclostridium, Gottschalkia and Tyzzerella. This work reaffirms that 16S rRNA and ribosomal protein sequences are better indicators of evolutionary proximity than phenotypic traits, even such key ones as the structure of the cell envelope and Gram-staining pattern.
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Affiliation(s)
- Natalya Yutin
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD, 20894, USA
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Bouvet P, K'Ouas G, Le Coustumier A, Popoff MR. Clostridium celerecrescens, often misidentified as "Clostridium clostridioforme group," is involved in rare human infection cases. Diagn Microbiol Infect Dis 2012; 74:299-302. [PMID: 22901791 DOI: 10.1016/j.diagmicrobio.2012.06.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Revised: 06/15/2012] [Accepted: 06/25/2012] [Indexed: 11/30/2022]
Abstract
Misidentification of rare Clostridium species often originated from the environment as clinically relevant species is problematic. A strain isolated from a traumatic leg wound first identified as C. clostridioforme was finally identified as the rare Clostridium celerecrescens. Two similar misidentifications are reported in the literature. In order to help the phenotypic differentiation of C. celerecrescens from the close species of the "C. clostridioforme group", an identification table and differential susceptibilities to 4 selected antibiotics are proposed. Once a clinical isolate is referred to this group, identification should be definitively confirmed by unambiguous methods such as 16s rDNA sequencing.
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Affiliation(s)
- Philippe Bouvet
- Institut Pasteur, Centre National de Référence des Bactéries Anaérobies et du Botulisme, Unité Bactéries anaérobies et Toxines, 25-28 rue du Docteur Roux, F-75724 Paris cedex 15, France.
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