Journal of Microbiology

Full articles

Prebiotic potential of proso millet and quinoa: Effects on gut microbiota composition and functional metabolic pathways: Jinwoo Kim, Jiwoon Kim, Yewon Jung, Gyungcheon Kim, Seongok Kim, Hakdong Shin; J. Microbiol. 2025;63(7):e2503002. Published online July 31, 2025; DOI: https://doi.org/10.71150/jm.2503002

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Abstract PDF Supplementary Material: Prebiotics are indigestible dietary components that improve host health by stimulating the growth and metabolic activity of beneficial intestinal microbes. The whole grains are rich in non-digestible carbohydrates, which may confer prebiotic potential. Among them, millet and quinoa have gained attention as dietary alternatives due to the growing popularity of gluten-free diets. In this study, we examined the effects of proso millet and quinoa on the human gut microbiota using an in vitro fecal incubation model. Both grains altered alpha diversity metrics, including microbial richness, evenness, and phylogenetic diversity. Beta diversity analysis showed that the proso millet and quinoa treatment groups exhibited distinct clustering patterns compared to the control, highlighting their impact on microbial community structure. Taxonomic analysis showed an increase in beneficial genera, including Bifidobacterium, and a decrease in taxa such as Enterobacteriaceae and Flavonifractor. To assess metabolic changes associated with microbial fermentation, short-chain fatty acid (SCFA) intensities were measured. The intensities of acetic acid, propionic acid, and butyric acid were significantly higher in the proso millet- and quinoa-treated groups compared to the control group. Spearman correlation analysis showed that the abundances of Bifidobacterium and Blautia were significantly positively associated with SCFA intensities. Furthermore, predicted functional pathway analysis identified enrichment of carbohydrate-related pathways in proso millet and quinoa treatments. Quinoa supplementation led to a broader enhancement of metabolic pathways, including glycolysis/gluconeogenesis, starch and sucrose metabolism, and pentose phosphate pathways, whereas proso millet enriched galactose metabolism, and starch and sucrose metabolism. These findings suggest that proso millet and quinoa influence gut microbial diversity, composition, and function.

Bacteroides celer sp. nov. and Bacteroides mucinivorans sp. nov., isolated from human feces, and the reclassification of Bacteroides koreensis Shin et al. 2017 and Bacteroides kribbi Shin et al. 2017 as later heterotypic synonyms of Bacteroides ovatus Eggerth and Gagnon 1933 (Approved Lists 1980): Ah-In Yang, Bora Kim, Woorim Kang, Hae-In Joe, Na-Ri Shin; J. Microbiol. 2025;63(6):e2502006. Published online June 30, 2025; DOI: https://doi.org/10.71150/jm.2502006; Correction in: J. Microbiol 2025;63(7):e2507100

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Abstract PDF Supplementary Material: Two novel, Gram-stain-negative, anaerobic, and non-motile bacterial strains, designated KFT8^T and CG01^T, were isolated from the feces of healthy individuals without diagnosed diseases and characterized using a polyphasic approach. Phylogenetic analysis revealed that both strains belong to the genus Bacteroides, with < 99.0% similarity in their 16S rRNA gene sequences to B. facilis NSJ-77^T and B. nordii JCM 12987^T. Within the genus Bacteroides, strain KFT8^T exhibited the highest Orthologous Average Nucleotide Identity value of 94.7% and a digital DNA-DNA hybridization value of 63.7% with B. ovatus ATCC 8483^T, whereas strain CG01^T showed the highest values of 95.3% and 63.3%, respectively, with B. nordii JCM 12987^T. The values between the two novel strains were 74.8% and 21.4%, respectively, which are below the species delineation thresholds, supporting their classification as novel species. The major fatty acid of strain KFT8^T was C_18:1 ω9c, whereas strain CG01^T predominantly contained summed feature 11 (comprising iso-C_17:0 3OH and/or C_18:2 DMA). The only respiratory quinone was MK-11, the major polar lipid was phosphatidylethanolamine. Both strains produced succinic acid and acetic acid as common metabolic end-products of fermentation, while lactic acid and formic acid were detected individually in each strain. Based on polyphasic characterization, strains KFT8^T (= KCTC 15614^T = JCM 36011^T) and CG01^T (= KCTC 15613^T = JCM 36010^T) represent two novel species within the genus Bacteroides, for which the names Bacteroides celer sp. nov. and Bacteroides mucinivorans sp. nov. are proposed, respectively. Additionally, genome-based analyses and phenotypic comparisons revealed that B. koreensis and B. kribbi represent the same strain, showing genomic relatedness to B. ovatus that exceeds the threshold for species delineation. Consequently, we propose the reclassification of B. koreensis Shin et al. 2017 and B. kribbi Shin et al. 2017 as later heterotypic synonyms of B. ovatus Eggerth and Gagnon 1933 (Approved Lists 1980).

Review

Fecal Microbiota Transplantation: Indications, Methods, and Challenges.: Jee Young Lee, Yehwon Kim, Jiyoun Kim, Jiyeun Kate Kim; J. Microbiol. 2024;62(12):1057-1074. Published online November 18, 2024; DOI: https://doi.org/10.1007/s12275-024-00184-3

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Over the past two decades, as the importance of gut microbiota to human health has become widely known, attempts have been made to treat diseases by correcting dysbiosis of gut microbiota through fecal microbiota transplantation (FMT). Apart from current knowledge of gut microbiota, FMT to treat disease has a long history, from the treatment of food poisoning in the fourth century to the treatment of Clostridioides difficile infections in the twentieth century. In 2013, FMT was recognized as a standard treatment for recurrent C. difficile because it consistently showed high efficacy. Though recurrent C. difficile is the only disease internationally recognized for FMT efficacy, FMT has been tested for other diseases and shown some promising preliminary results. Different FMT methods have been developed using various formulations and administration routes. Despite advances in FMT, some issues remain to be resolved, such as donor screening, manufacturing protocols, and unknown components in the fecal microbiota. In this review, we discuss the mechanisms, clinical indications, methods, and challenges of current FMT. We also discuss the development of alternative therapies to overcome the challenges of FMT.

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Transplantation of Fecal Flora from Patients with Atherosclerosis to Mice Can Increase Serum Low-Density Lipoprotein Cholesterol and Affect Intestinal Flora and Its Metabolites
Liang Feng, Jianting Feng, Li He, Fu Chen, Xin Feng, Suwen Wang
Applied Microbiology.2025; 5(1): 29. CrossRef
Management of refractory checkpoint inhibitor-induced colitis
Anas Zaher, Maria Julia Moura Nascimento Santos, Hassan Elsaygh, Stephen J. Peterson, Carolina Colli Cruz, Anusha Shirwaikar Thomas, Yinghong Wang
Expert Opinion on Drug Safety.2025; : 1. CrossRef
Fecal Microbiota Transplantation (FMT) in Clostridium difficile Infection: A Paradigm Shift in Gastrointestinal Microbiome Modulation
Muhammad Hamza Saeed, Sundas Qamar, Ayesha Ishtiaq, Qudsia Umaira khan, Asma Atta, Maryam Atta, Hifza Ishtiaq, Marriam Khan, Muhammad Rawal Saeed, Ayesha Iqbal
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Exploring the gut microbiome’s influence on cancer-associated anemia: Mechanisms, clinical challenges, and innovative therapies
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Microbiome Therapeutics for Clostridioides difficile Infection
Christine W. Lucky, Brendan J. Kelly, Jennie H. Kwon, Michael H. Woodworth, Rachel L. Medernach
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Laboratory preparation methods for human-derived fecal microbial suspensions for fecal microbiota transplantation: a review and standardization perspectives
Jinhua Gong, Yuchi Liu, Liuye Huang
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Improving fecal transplantation precision for enhanced maturation of intestinal function in germ-free mice through microencapsulation and probiotic intervention
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Fecal microbiota transplantation as salvage therapy for disseminated strongyloidiasis in an immunosuppressed patient: a case report
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Journal Articles

Rhodobacteraceae are Prevalent and Ecologically Crucial Bacterial Members in Marine Biofloc Aquaculture: Meora Rajeev, Jang-Cheon Cho; J. Microbiol. 2024;62(11):985-997. Published online November 15, 2024; DOI: https://doi.org/10.1007/s12275-024-00187-0

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Bioflocs are microbial aggregates primarily composed of heterotrophic bacteria that play essential ecological roles in maintaining animal health, gut microbiota, and water quality in biofloc aquaculture systems. Despite the global adoption of biofloc aquaculture for shrimp and fish cultivation, our understanding of biofloc microbiota-particularly the dominant bacterial members and their ecological functions-remains limited. In this study, we employed integrated metataxonomic and metagenomic approaches to demonstrate that the family Rhodobacteraceae of Alphaproteobacteria consistently dominates the biofloc microbiota and plays essential ecological roles. We first analyzed a comprehensive metataxonomic dataset consisting of 200 16S rRNA gene amplicons collected across three Asian countries: South Korea, China, and Vietnam. Taxonomic investigation identified Rhodobacteraceae as the dominant and consistent bacterial members across the datasets. The predominance of this taxon was further validated through metagenomics approaches, including read taxonomy and read recruitment analyses. To explore the ecological roles of Rhodobacteraceae, we applied genome-centric metagenomics, reconstructing 45 metagenome-assembled genomes. Functional annotation of these genomes revealed that dominant Rhodobacteraceae genera, such as Marivita, Ruegeria, Dinoroseobacter, and Aliiroseovarius, are involved in vital ecological processes, including complex carbohydrate degradation, aerobic denitrification, assimilatory nitrate reduction, ammonium assimilation, and sulfur oxidation. Overall, our study reveals that the common practice of carbohydrate addition in biofloc aquaculture systems fosters the growth of specific heterotrophic bacterial communities, particularly Rhodobacteraceae. These bacteria contribute to maintaining water quality by removing toxic nitrogen and sulfur compounds and enhance animal health by colonizing gut microbiota and exerting probiotic effects.

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Ecological disposal of bauxite tailings and red mud: A sustainable strategy for bauxite industrial waste reuse
Xusheng Jiang, Xuehong Zhang, Xijun Liu, Hui Qiu, Mengting Lin, Guo Yu, Shouhui Zhang, Jie Liu
Resources, Conservation and Recycling.2025; 218: 108259. CrossRef
Variation of Microorganisms and Water Quality, and Their Impacts on the Production of Penaeus vannamei in Small-Scale Greenhouse Ponds
Siyu Wu, Haochang Su, Lei Su, Yucheng Cao, Guoliang Wen, Yu Xu, Bin Shen, Shanshan Wu, Yuting Su, Xiaojuan Hu
Microorganisms.2025; 13(3): 546. CrossRef
Effect of hydraulic retention time of sponge-based trickling filter for shrimp culture recirculating tank
Penpicha Satanwat, Mami Nagai, Tharin Boonprasertsakul, Akihiro Nagano, Tsutomu Okubo, Nur Adlin, Takahiro Watari, Masashi Hatamoto, Takashi Yamaguchi, Sitthakarn Sitthi, Wiboonluk Pungrasmi, Rapeepun Vanichviriyakit, Sorawit Powtongsook
Process Safety and Environmental Protection.2025; 198: 107154. CrossRef
Divergence patterns of bacterial communities between larviculture systems of two Penaeus vannamei strains with distinct culture traits
Heng Chen, Fengdie Zhang, Junqi Yu, Rudan Chen, Demin Zhang, Chen Chen, Kai Wang
Aquaculture.2025; 606: 742572. CrossRef
Influence of Polyester and Denim Microfibers on the Treatment and Formation of Aerobic Granules in Sequencing Batch Reactors
Victoria Okhade Onyedibe, Hassan Waseem, Hussain Aqeel, Steven N. Liss, Kimberley A. Gilbride, Roxana Sühring, Rania Hamza
Processes.2025; 13(7): 2272. CrossRef

Description of Streptococcus dentalis sp. nov., Streptococcus gingivalis sp. nov., and Streptococcus lingualis sp. nov., Isolated from Human Oral Cavities: Beom-Jin Goo, Young-Sik Choi, Do-Hun Gim, Su-Won Jeong, Jee-Won Choi, Hojun Sung, Jae-Yun Lee, Jin-Woo Bae; J. Microbiol. 2024;62(11):973-983. Published online November 12, 2024; DOI: https://doi.org/10.1007/s12275-024-00178-1

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We isolated three novel strains, S1^T, S2^T, and S5^T, from human oral cavities and identified them as distinct novel species. All these strains are facultatively anaerobic, Gram-stain-positive, and non-flagellated bacteria. Their optimal growth conditions for these strains were observed in Columbia broth (CB) at 37 °C, pH 7.0, and in the absence of NaCl. Phylogenetic analyses, employing the 16S rRNA gene and whole-genome sequencing, confirmed that all three strains belong to the genus Streptococcus. The 16S rRNA gene sequences of strains S1^T, S2^T, and S5^T showed the highest similarities to Streptococcus parasanguinis, 98.57%, 99.05%, and 99.05%, respectively, and the orthologous average nucleotide identity (OrthoANI) values between the three strains and S. parasanguinis were 93.82%, 93.67%, and 94.04%, respectively. The pairwise OrthoANI values between the novel strains were 94.37% (S1^T-S2^T), 95.03% (S2^T-S5^T), and 94.71% (S1^T-S5^T). All strains had C_20:1 ω9c and summed feature 8 (C_18:1 ω7c and/or C_18:1 ω6c) as major cellular fatty acids. Additionally, diphosphatidylglycerol (DPG) and hydroxyphosphatidylethanolamine (OH-PE) were identified as major polar lipids. Menaquinone was undetected in all strains. The results from the phylogenetic, phenotypic, chemotaxonomic, and genotypic analyses collectively indicated that strains S1^T, S2^T, and S5^T represent three distinct novel species within the genus Streptococcus, and we propose the names Streptococcus dentalis sp. nov. for strain S1^T (= KCTC 21234^T = JCM 36526^T), Streptococcus gingivalis sp. nov. for strain S2^T (= KCTC 21235^T = JCM 36527^T), and Streptococcus lingualis sp. nov. for strain S5^T (= KCTC 21236^T = JCM 36528^T).

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Validation List no. 223. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2025;[Epub] CrossRef

The Impact of Makgeolli Consumption on Gut Microbiota: An Enterotype-Based Preliminary Study: Gyungcheon Kim, Seongok Kim, Hayan Jung, Seohyun Kang, Gwoncheol Park, Hakdong Shin; J. Microbiol. 2024;62(11):965-972. Published online October 16, 2024; DOI: https://doi.org/10.1007/s12275-024-00176-3

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Makgeolli, a traditional Korean liquor, contains components such as lactic acid bacteria and dietary fiber, which can induce changes in the gut microbiome. Since variations in microbiome responses may exist between enterotypes-classifications based on the dominant bacterial populations in the gut-we hypothesized that the consumption of makgeolli leads to enterotype-dependent differences in gut microbial structures among healthy participants. This study aimed to determine the effect of makgeolli consumption on gut microbial structures by stratifying all participants into two enterotype groups: Bacteroides-dominant type (B-type, n = 7) and Prevotella-dominant type (P-type, n = 4). The B-type showed an increase in alpha diversity, while no significant difference was observed in the P-type following makgeolli consumption. The composition of gut microbiota significantly changed in the B-type, whereas no noticeable alteration was observed in the P-type after makgeolli consumption. Notably, Prevotella exhibited the most significant changes only in the P-type. In line with the increased abundance of Prevotella, the genes associated with carbohydrate metabolism, including pentose/glucuronate interconversions, fructose/mannose metabolism, starch/sucrose metabolism and amino sugar/nucleotide sugar metabolism were significantly enriched following makgeolli consumption in the P-type. These findings suggest that makgeolli consumption induces enterotype-dependent alterations in gut microbial composition and metabolic pathways, highlighting the potential for personalized dietary interventions.

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The prebiotic potential of dietary onion extracts: shaping gut microbial structures and promoting beneficial metabolites
Yebeen Yoo, Seongok Kim, WonJune Lee, Jinwoo Kim, Bokyung Son, Kwang Jun Lee, Hakdong Shin, Aviâja Lyberth Hauptmann
mSystems.2025;[Epub] CrossRef
Dietary Fiber Intake Improves Osteoporosis Caused by Chronic Lead Exposure by Restoring the Gut–Bone Axis
Ruijian Wang, Jin Shen, Chunqing Han, Xiaodong Shi, Yan Gong, Xiping Hu, Zhongtang Jia, Miaomiao Wang, Yu Wu
Nutrients.2025; 17(9): 1513. CrossRef
Modulation of Gut Microbiota by Cacao: Insights from an In Vitro Model
Jinshil Kim, Sunil Jung, Gyungcheon Kim, Jinwoo Kim, Bokyung Son, Hakdong Shin
Current Issues in Molecular Biology.2025; 47(6): 414. CrossRef

The Gut Microbiota Mediates the Protective Effects of Spironolactone on Myocardial Infarction: Lu Li, Jian-Yong Sun, Yu-Lin Li, Shi-Wei Zhu, Sheng-Zhong Duan; J. Microbiol. 2024;62(10):883-895. Published online September 3, 2024; DOI: https://doi.org/10.1007/s12275-024-00164-7

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Myocardial infarction (MI) is a type of cardiovascular disease that influences millions of human beings worldwide and has a great rate of mortality and morbidity. Spironolactone has been used as a critical drug for the treatment of cardiac failure and it ameliorates cardiac dysfunction post-MI. Despite these findings, whether there is a relationship between the therapeutic effects of spironolactone and the gut microorganism after MI has not been determined. In our research, we used male C57BL/6 J mice to explore whether the gut microbiota mediates the beneficial function of spironolactone after myocardial infarction. We demonstrated that deletion of the gut microbiota eliminated the beneficial function of spironolactone in MI mice, displaying exacerbated cardiac dysfunction, cardiac infarct size. In addition, the gut microbiota was altered by spironolactone after sham or MI operation in mice. We also used male C57BL/6 J mice to investigate the function of a probiotic in the myocardial infarction. In summary, our findings reveal a precious role of the gut flora in the therapeutic function of spironolactone on MI.

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Probiotics and Prebiotics in Post-Myocardial Infarction Rehabilitation: Mechanisms, Benefits, and Future Directions
Georgy Leonov, Elena Livantsova, Yurgita Varaeva, Antonina Starodubova
Current Nutrition Reports.2025;[Epub] CrossRef
Research Trends and Hotspots of Gut Microbiota and Its Metabolites in Cardiovascular Diseases: A Bibliometric Analysis
Kaixuan Zhang, Yajun Shi, Lirong Peng, Xiaofei Zhang, Nanbo Zheng, Jiajing Xin, Junbo Zou, Fei Luan
Journal of Multidisciplinary Healthcare.2025; Volume 18: 5125. CrossRef
The role of the gut microbiota in the onset and progression of heart failure: insights into epigenetic mechanisms and aging
Giulia Matacchione, Francesco Piacenza, Lorenzo Pimpini, Yuri Rosati, Serena Marcozzi
Clinical Epigenetics.2024;[Epub] CrossRef

Identification of avaC from Human Gut Microbial Isolates that Converts 5AVA to 2-Piperidone: Qiudi Zhou, Lihui Feng; J. Microbiol. 2024;62(5):367-379. Published online June 17, 2024; DOI: https://doi.org/10.1007/s12275-024-00141-0

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2-piperidone is a crucial industrial raw material of high-value nylon-5 and nylon-6,5. Currently, a major bottleneck in the biosynthesis of 2-piperidone is the identification of highly efficient 2-piperidone synthases. In this study, we aimed to identify specific strains among 51 human gut bacterial strains capable of producing 2-piperidone and to elucidate its synthetic mechanism. Our findings revealed that four gut bacterial strains, namely Collinsella aerofaciens LFYP39, Collinsella intestinalis LFYP54, Clostridium bolteae LFYP116, and Clostridium hathewayi LFYP18, could produce 2-piperidone from 5-aminovaleric acid (5AVA). Additionally, we observed that 2-piperidone could be synthesized from proline through cross-feeding between Clostridium difficile LFYP43 and one of the four 2-piperidone producing strains, respectively. To identify the enzyme responsible for catalyzing the conversion of 5AVA to 2-piperidone, we utilized a gain-of-function library and identified avaC (5-aminovaleric acid cyclase) in C. intestinalis LFYP54. Moreover, homologous genes of avaC were validated in the other three bacterial strains. Notably, avaC were found to be widely distributed among environmental bacteria. Overall, our research delineated the gut bacterial strains and genes involved in 2-piperidone production, holding promise for enhancing the efficiency of industrial biosynthesis of this compound.

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Metabolite biomarkers of screening neonatal congenital hypothyroidism based on dried blood spot metabolomics
Xingyu Guo, Feng Suo, Yuting Wang, Di Yu, Yi Wang, Bulian Dong, Lingshan Gou, Xinhui Gan, Benjing Wang, Chaowen Yu, Xiaoxiang Xie, Dandan Linghu, Xinyu Liu, Maosheng Gu, Guowang Xu
Analytical and Bioanalytical Chemistry.2025; 417(13): 2889. CrossRef

Effects of Light and Dark Conditions on the Transcriptome of Aging Cultures of Candidatus Puniceispirillum marinum IMCC1322: Ji Hyen Lee, Hyun-Myung Oh; J. Microbiol. 2024;62(4):297-314. Published online April 25, 2024; DOI: https://doi.org/10.1007/s12275-024-00125-0

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To elucidate the function of proteorhodopsin in Candidatus Puniceispirillum marinum strain IMCC1322, a cultivated representative of SAR116, we produced RNA-seq data under laboratory conditions. We examined the transcriptomes of six different cultures, including sets of expression changes under constant dark (DD), constant light (LL), and diel-cycled (LD; 14 h light: 10 h dark) conditions at the exponential and stationary/death phases. Prepared mRNA extracted from the six samples was analyzed on the Solexa Genome Analyzer with 36 cycles. Differentially expressed genes on the IMCC1322 genome were distinguished as four clusters by K-mean clustering and each CDS (n = 2546) was annotated based on the KEGG BRITE hierarchy. Cluster 0 (n = 1573) covered most constitutive genes including proteorhodopsin, retinoids, and glycolysis/TCA cycle. Cluster 1 genes (n = 754) were upregulated in stationary/death phase under constant dark conditions and included genes associated with bacterial defense, membrane transporters, nitrogen metabolism, and senescence signaling. Cluster 2 genes (n = 197) demonstrated upregulation in exponential phase cultures and included genes involved in genes for oxidative phosphorylation, translation factors, and transcription machinery. Cluster 3 (n = 22) contained light-stimulated upregulated genes expressed under stationary/phases. Stringent response genes belonged to cluster 2, but affected genes spanned various cellular processes such as amino acids, nucleotides, translation, transcription, glycolysis, fatty acids, and cell wall components. The coordinated expression of antagonistic stringent genes, including mazG, ppx/gppA, and spoT/relA may provide insight into the controlled cultural response observed between constant light and constant dark conditions in IMCC1322 cultures, regardless of cell numbers and biomass.

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Culture-supported ecophysiology of the SAR116 clade demonstrates metabolic and spatial niche partitioning
Jordan T Coelho, Lauren Teubner, Michael W Henson, V Celeste Lanclos, Conner Y Kojima, J Cameron Thrash
The ISME Journal.2025;[Epub] CrossRef
Effect of Light Regime on Candidatus Puniceispirillum marinum IMCC1322 in Nutrient-Replete Conditions
Hyun-Myung Oh, Ji Hyen Lee, Ahyoung Choi, Sung-Hyun Yang, Gyung-Hoon Shin, Sung Gyun Kang, Jang-Cheon Cho, Hak Jun Kim, Kae-Kyoung Kwon
Journal of Microbiology and Biotechnology.2024;[Epub] CrossRef

Reviews

Balancing Act of the Intestinal Antimicrobial Proteins on Gut Microbiota and Health: Ye Eun Ra, Ye‑Ji Bang; J. Microbiol. 2024;62(3):167-179. Published online April 17, 2024; DOI: https://doi.org/10.1007/s12275-024-00122-3

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The human gut houses a diverse and dynamic microbiome critical for digestion, metabolism, and immune development, exerting profound efects on human health. However, these microorganisms pose a potential threat by breaching the gut barrier, entering host tissues, and triggering infections, uncontrolled infammation, and even sepsis. The intestinal epithelial cells form the primary defense, acting as a frontline barrier against microbial invasion. Antimicrobial proteins (AMPs), produced by these cells, serve as innate immune efectors that regulate the gut microbiome by directly killing or inhibiting microbes. Abnormal AMP production, whether insufcient or excessive, can disturb the microbiome equilibrium, contributing to various intestinal diseases. This review delves into the complex interactions between AMPs and the gut microbiota and sheds light on the role of AMPs in governing host-microbiota interactions. We discuss the function and mechanisms of action of AMPs, their regulation by the gut microbiota, microbial evasion strategies, and the consequences of AMP dysregulation in disease. Understanding these complex interactions between AMPs and the gut microbiota is crucial for developing strategies to enhance immune responses and combat infections within the gut microbiota. Ongoing research continues to uncover novel aspects of this intricate relationship, deepening our understanding of the factors shaping gut health. This knowledge has the potential to revolutionize therapeutic interventions, ofering enhanced treatments for a wide range of gut-related diseases.

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Skin Deep: The Potential of Microbiome Cosmetics: Ju Hee Han, Hei Sung Kim; J. Microbiol. 2024;62(3):181-199. Published online April 16, 2024; DOI: https://doi.org/10.1007/s12275-024-00128-x

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Abstract PDF

The interplay between the skin microbiome and its host is a complex facet of dermatological health and has become a critical focus in the development of microbiome cosmetics. The skin microbiome, comprising various microorganisms, is essential from birth, develops over the lifespan, and performs vital roles in protecting our body against pathogens, training the immune system, and facilitating the breakdown of organic matter. Dysbiosis, an imbalance of these microorganisms, has been implicated in a number of skin conditions such as acne, atopic dermatitis, and skin cancer. Recent scientific findings have spurred cosmetic companies to develop products that preserve and enhance the skin's microbial diversity balance. These products may incorporate elements like prebiotics, probiotics, and postbiotics, which are beneficial for the skin microbiome. Beyond topical products, there's increasing interest in ingestible beauty supplements (i.e. oral probiotics), highlighting the connection between the gut and skin. This review examines the influence of the microbiome on skin health and the emerging trends of microbiome skincare products.

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MAPK Cascades in Plant Microbiota Structure and Functioning: Thijs Van Gerrewey, Hoo Sun Chung; J. Microbiol. 2024;62(3):231-248. Published online April 8, 2024; DOI: https://doi.org/10.1007/s12275-024-00114-3

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Abstract PDF

Mitogen-activated protein kinase (MAPK) cascades are highly conserved signaling modules that coordinate diverse biological processes such as plant innate immunity and development. Recently, MAPK cascades have emerged as pivotal regulators of the plant holobiont, infuencing the assembly of normal plant microbiota, essential for maintaining optimal plant growth and health. In this review, we provide an overview of current knowledge on MAPK cascades, from upstream perception of microbial stimuli to downstream host responses. Synthesizing recent fndings, we explore the intricate connections between MAPK signaling and the assembly and functioning of plant microbiota. Additionally, the role of MAPK activation in orchestrating dynamic changes in root exudation to shape microbiota composition is discussed. Finally, our review concludes by emphasizing the necessity for more sophisticated techniques to accurately decipher the role of MAPK signaling in establishing the plant holobiont relationship.

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Hydroxychloroquine an Antimalarial Drug, Exhibits Potent Antifungal Efficacy Against Candida albicans Through Multitargeting: Sargun Tushar Basrani, Tanjila Chandsaheb Gavandi, Shivani Balasaheb Patil, Nandkumar Subhash Kadam, Dhairyasheel Vasantrao Yadav, Sayali Ashok Chougule, Sankunny Mohan Karuppayil, Ashwini Khanderao Jadhav; J. Microbiol. 2024;62(5):381-391. Published online April 8, 2024; DOI: https://doi.org/10.1007/s12275-024-00111-6

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Candida albicans is the primary etiological agent associated with candidiasis in humans. Unrestricted growth of C. albicans can progress to systemic infections in the worst situation. This study investigates the antifungal activity of Hydroxychloroquine (HCQ) and mode of action against C. albicans. HCQ inhibited the planktonic growth and yeast to hyphal form morphogenesis of C. albicans significantly at 0.5 mg/ml concentration. The minimum inhibitory concentrations (MIC(50)) of HCQ for C. albicans adhesion and biofilm formation on the polystyrene surface was at 2 mg/ml and 4 mg/ml respectively. Various methods, such as scanning electron microscopy, exploration of the ergosterol biosynthesis pathway, cell cycle analysis, and assessment of S oxygen species (ROS) generation, were employed to investigate HCQ exerting its antifungal effects. HCQ was observed to reduce ergosterol levels in the cell membranes of C. albicans in a dose-dependent manner. Furthermore, HCQ treatment caused a substantial arrest of the C. albicans cell cycle at the G0/G1 phase, which impeded normal cell growth. Gene expression analysis revealed upregulation of SOD2, SOD1, and CAT1 genes after HCQ treatment, while genes like HWP1, RAS1, TEC1, and CDC 35 were downregulated. The study also assessed the in vivo efficacy of HCQ in a mice model, revealing a reduction in the pathogenicity of C. albicans after HCQ treatment. These results indicate that HCQ holds for the development of novel antifungal therapies.

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Genomic Evolution and Recombination Dynamics of Human Adenovirus D Species: Insights from Comprehensive Bioinformatic Analysis: Anyeseu Park, Chanhee Lee, Jeong Yoon Lee; J. Microbiol. 2024;62(5):393-407. Published online March 7, 2024; DOI: https://doi.org/10.1007/s12275-024-00112-5

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Human adenoviruses (HAdVs) can infect various epithelial mucosal cells, ultimately causing different symptoms in infected organ systems. With more than 110 types classified into seven species (A-G), HAdV-D species possess the highest number of viruses and are the fastest proliferating. The emergence of new adenovirus types and increased diversity are driven by homologous recombination (HR) between viral genes, primarily in structural elements such as the penton base, hexon and fiber proteins, and the E1 and E3 regions. A comprehensive analysis of the HAdV genome provides valuable insights into the evolution of human adenoviruses and identifies genes that display high variation across the entire genome to determine recombination patterns. Hypervariable regions within genetic sequences correlate with functional characteristics, thus allowing for adaptation to new environments and hosts. Proteotyping of newly emerging and already established adenoviruses allows for prediction of the characteristics of novel viruses. HAdV-D species evolved in a direction that increased diversity through gene recombination. Bioinformatics analysis across the genome, particularly in highly variable regions, allows for the verification or re-evaluation of recombination patterns in both newly introduced and pre-existing viruses, ultimately aiding in tracing various biological traits such as virus tropism and pathogenesis. Our research does not only assist in predicting the emergence of new adenoviruses but also offers critical guidance in regard to identifying potential regulatory factors of homologous recombination hotspots.

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Relationship between adenovirus infection and intussusception via pathological evidence confirms
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Effects of Feather Hydrolysates Generated by Probiotic Bacillus licheniformis WHU on Gut Microbiota of Broiler and Common carp: Kamin Ke, Yingjie Sun, Tingting He, Wenbo Liu, Yijiao Wen, Siyuan Liu, Qin Wang, Xiaowei Gao; J. Microbiol. 2024;62(6):473-487. Published online February 29, 2024; DOI: https://doi.org/10.1007/s12275-024-00118-z

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Abstract PDF

Due to the ever-increasing demand for meat, it has become necessary to identify cheap and sustainable sources of protein for animal feed. Feathers are the major byproduct of poultry industry, which are rich in hard-to-degrade keratin protein. Previously we found that intact feathers can be digested into free amino acids, short peptides, and nano-/micro-keratin particles by the strain Bacillus licheniformis WHU in water, and the resulting feather hydrolysates exhibit prebiotic effects on mice. To explore the potential utilization of feather hydrolysate in the feed industry, we investigated its effects on the gut microbiota of broilers and fish. Our results suggest that feather hydrolysates significantly decrease and increase the diversity of gut microbial communities in broilers and fish, respectively. The composition of the gut microbiota was markedly altered in both of the animals. The abundance of bacteria with potentially pathogenic phenotypes in the gut microbial community of the fish significantly decreased. Staphylococcus spp., Pseudomonas spp., Neisseria spp., Achromobacter spp. were significantly inhibited by the feather hydrolysates. In addition, feather hydrolysates significantly improved proteolytic activity in the guts of broilers and fish. In fish, the expression levels of ZO-1 and TGF-α significantly improved after administration of feather hydrolysates. The results presented here suggest that feather hydrolysates generated by B. licheniformis WHU could be an alternative protein source in aquaculture and could exert beneficial effects on fish.

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Keratinous bioresources: their generation, microbial degradation, and value enhancement for biotechnological applications
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World Journal of Microbiology and Biotechnology.2025;[Epub] CrossRef

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