Journal of Microbiology

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ITS1-based profiling of the skin mycobiome in truncal acne reveals altered baseline ecology and heterogeneous doxycycline-associated patterns: Nayan Jin, Woo Jun Sul, Hye Rim Do, Hei Sung Kim; J. Microbiol. 2026;64(2):e2512013. Published online February 28, 2026; DOI: https://doi.org/10.71150/jm.2512013

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Abstract PDF Supplementary Material: Truncal acne represents a biologically distinct manifestation of acne vulgaris, yet its fungal ecology remains incompletely characterized. Previous work using internal transcribed spacer 2 (ITS2) sequencing suggested that truncal acne is associated with altered fungal richness and Malassezia species composition; however, fungal marker choice may influence ecological inference, particularly in sebaceous skin dominated by Malassezia. In this study, we characterized the truncal skin mycobiome of patients with truncal acne and healthy controls using internal transcribed spacer 1 (ITS1) amplicon sequencing. Skin swabs were collected from the upper back, and fungal communities were analyzed using QIIME 2 with taxonomic assignment against the UNITE v10.0 database. Baseline acne–control differences and doxycycline-associated patterns were evaluated using alpha- and beta-diversity metrics and differential abundance analyses. Doxycycline-associated patterns were assessed using paired, within-patient pre- and post-exposure comparisons. ITS1 profiling demonstrated that truncal acne was associated with altered baseline fungal ecology compared with controls, characterized by reduced alpha diversity and ASV-level differences within Malassezia-dominated communities. Beta-diversity analyses showed substantial overlap between acne and control samples, indicating limited global separation. Following doxycycline exposure, fungal communities remained Malassezia-dominant and did not demonstrate uniform convergence toward control profiles; instead, species- and ASV-level differences were heterogeneous across individuals and exposure durations. Together with prior ITS2-based findings, these results underscore the importance of marker-dependent perspectives when interpreting fungal ecology in sebaceous skin.

Ecological characteristics of the truncal skin mycobiome in acne and its association with doxycycline exposure: Hyun Ji Lee, Yong-Joon Cho, Nayan Jin, Piyapat Rintarhat, Won Hee Jung, Hei Sung Kim; J. Microbiol. 2026;64(1):e2511019. Published online January 31, 2026; DOI: https://doi.org/10.71150/jm.2511019

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Abstract PDF Supplementary Material: Truncal acne significantly impairs quality of life yet remains underexplored relative to facial acne, particularly with respect to fungal ecology. The trunk represents a distinct cutaneous niche characterized by thicker epidermis, larger follicular units, and frequent occlusion, and harbors a high abundance of Malassezia species. In this study, we used internal transcribed spacer 2 (ITS2) amplicon sequencing to characterize the truncal mycobiome in patients with acne and in healthy controls and to compare fungal community features across doxycycline exposure groups. Although serial sampling was planned, seven participants contributed a single follow-up sample after doxycycline treatment, and only two participants contributed multiple follow-up samples sufficient for true within-subject longitudinal analyses; therefore, most analyses represent exposure-stratified cross-sectional comparisons rather than confirmed temporal change. At baseline, truncal acne lesions exhibited increased fungal richness and distinct community composition compared with controls. Acne lesions were more frequently enriched for Malassezia globosa, whereas healthy controls were dominated by M. sympodialis. Across doxycycline exposure groups, fungal communities remained Malassezia-dominant with substantial inter-individual variability. Doxycycline exposure was associated with partial and heterogeneous differences in Malassezia species composition without uniform normalization toward control profiles. Because only fungal sequencing was performed, bacterial–fungal interactions were inferred from prior literature and not directly measured. These findings indicate that truncal acne is associated with a distinct fungal community structure and highlight the need for integrated, longitudinal multi-omics studies to clarify treatment-associated microbial dynamics.

Effects of sequencing platforms on the profiling of root mycorrhizal communities in Pinus densiflora: Ki Hyeong Park, Seung-Yoon Oh, Shinnam Yoo, Yoonhee Cho, Ji Seon Kim, Chang Wan Seo, Chang Sun Kim, Young Woon Lim; J. Microbiol. 2026;64(1):e2509008. Published online January 31, 2026; DOI: https://doi.org/10.71150/jm.2509008

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Abstract PDF Supplementary Material: Next-generation sequencing (NGS) has become a powerful and efficient tool for surveying mycorrhizal mycobiome diversity, surpassing classical methods in accuracy and throughput. Long-read NGS techniques are increasingly applied under the assumption that they provide better taxonomic resolution, yet their use often lacks a balanced evaluation against the established strengths and limitations of widely used short-read NGS technologies. This study compares Illumina MiSeq and PacBio Sequel platforms in analyzing the mycorrhizal mycobiome of Pinus densiflora roots, focusing on how sequencing platforms and database choice influence taxonomic resolution and diversity patterns. Both platforms detected mycorrhizal taxa with similar taxonomic resolution, recovering nearly all taxa previously reported from pine roots. Most mycorrhizal taxa were shared between datasets, although several taxa were detected exclusively by one platform. In terms of diversity, the short-read dataset showed higher diversity due to greater sequencing depth, whereas the long-read dataset offered improved identification of rare or closely related taxa owing to longer sequence information. Moreover, supplementing reference databases with locally derived sequences enhanced taxonomic resolution and the detection of native taxa in both approaches, with a stronger effect for the long-read dataset. Overall, our results emphasize that short- and long-read sequencing each have distinct advantages for mycorrhizal community analysis, and that the use of curated local reference databases is essential to maximize taxonomic resolution and improve the detection of regionally unique taxa.

Journal Articles

Effects of Continuous Straw Returning on Soil Functional Microorganisms and Microbial Communities: Yunpeng Guan , Meikang Wu , Songhao Che , Shuai Yuan , Xue Yang , Siyuan Li , Ping Tian , Lei Wu , Meiying Yang , Zhihai Wu; J. Microbiol. 2023;61(1):49-62. Published online January 26, 2023; DOI: https://doi.org/10.1007/s12275-022-00004-6

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This study examined the changes in soil enzymatic activity, microbial carbon source metabolic diversity, and straw decomposition rates in paddy fields treated with 1, 2, or 3 years of straw returning (SR1–SR3). The soil’s ability to decompose straw and cellulolytic bacteria increased with the number of treatment years (1: 31.9% vs. 2: 43.9% vs. 3: 51.9%, P < 0.05). The numbers of Azotobacter, Nitrobacteria, cellulolytic bacteria, and inorganic phosphate bacteria increased progressively with the numbers of straw returning years. Cellulolytic bacteria and inorganic phosphate bacteria were significantly positively correlated with the decomposition rate (r = 0.783 and r = 0.375, P < 0.05). Based on 16S sequencing results, straw returning improved the microbial diversity of paddy soils by increasing unclassified bacteria and keeping dominant soil microorganism populations unchanged. The relative importance of individual microbial taxa was compared using random forest models. Proteobacteria, ammoniating bacteria, and potassium dissolving bacteria contributed to peroxidase activity. The significant contributors to phosphate monoesterase were Acidobacteriota, Desulfobacterota, ammoniating bacteria, cellulolytic bacteria, and potassium-dissolving bacteria. Proteobacteria, ammoniating bacteria, cellulolytic bacteria, and potassium-dissolving bacteria contributed to urease activity. Desulfobacterota, ammoniating bacteria, cellulolytic bacteria, and potassium-dissolving bacteria contributed to the neutral invertase activity. In conclusion, soil microbial community structure and function were affected within 2 years of straw returning, which was driven by the combined effects of soil organic carbon, available nitrogen, available potassium, and pH. With elapsing straw returning years, soil properties interacted with soil microbial communities, and a healthier soil micro-ecological environment would form.

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Description of Microbacterium luteum sp. nov., Microbacterium cremeum sp. nov., and Microbacterium atlanticum sp. nov., three novel C50 carotenoid producing bacteria: Fuquan Xie , Siwen Niu , Xihuang Lin , Shengxiang Pei , Li Jiang , Yun Tian , Gaiyun Zhang; J. Microbiol. 2021;59(10):886-897. Published online September 7, 2021; DOI: https://doi.org/10.1007/s12275-021-1186-5

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Abstract PDF

We have identified three Microbacterium strains, A18JL200T, NY27T, and WY121T, that produce C50 carotenoids. Taxonomy shows they represent three novel species. These strains shared < 98.5% 16S rRNA gene sequence identity with each other and were closely related to Microbacterium aquimaris JCM 15625T, Microbacterium yannicii JCM 18959T, Microbacterium ureisolvens CFH S00084T, and Microbacterium hibisci CCTCC AB 2016180T. Digital DNA-DNA hybridization (dDDH) values and average nucleotide identity (ANI) showed differences among the three strains and from their closest relatives, with values ranging from 20.4% to 34.6% and 75.5% to 87.6%, respectively. These values are below the threshold for species discrimination. Both morphology and physiology also differed from those of phylogenetically related Microbacterium species, supporting that they are indeed novel species. These strains produce C50 carotenoids (mainly decaprenoxanthin). Among the three novel species, A18JL200T had the highest total yield in carotenoids (6.1 mg/L or 1.2 mg/g dry cell weight). Unusual dual isoprenoid biosynthetic pathways (methylerythritol phosphate and mevalonate pathways) were annotated for strain A18JL200T. In summary, we found strains of the genus Microbacterium that are potential producers of C50 carotenoids, but their genome has to be investigated further.

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Identification, evaluation, control of yellow-causing bacteria and their influence on the quality of high moisture rice-based food
Sijie Zhang, Lin Ou, Cuiping Yi, Qiutao Xie, Yang Shan
Food Control.2025; 168: 110887. CrossRef
Microbacterium xanthum sp. nov. Isolated from Seaweed, with the Reclassification of Microbacterium ihumii Yacouba et al. 2023 as a Later Heterotypic Synonym of Microbacterium tenebrionis Lee and Kim 2023
Soon Dong Lee, Hong Lim Yang, In Seop Kim
Current Microbiology.2025;[Epub] CrossRef
Description of Microbacterium luticellae sp. nov., Microbacterium alcoholitolerans sp. nov. and Microbacterium daqui sp. nov. isolated from baijiu pit mud and daqu
Mingkai Tian, Ye Lu, Xinyu Liu, Yi Yan, Jialiang Xu
International Journal of Systematic and Evolutionary Microbiology .2025;[Epub] CrossRef
Chlamydomonas reinhardtii and Microbacterium forte sp. nov., a mutualistic association that favors sustainable hydrogen production
Neda Fakhimi, María Jesus Torres, Emilio Fernández, Aurora Galván, Alexandra Dubini, David González-Ballester
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Discovery of a new bacterium, Microbacterium betulae sp. nov., in birch wood associated with hypersensitivity pneumonitis in woodworkers
Mariola Paściak, Krzysztof J. Pawlik, Dariusz Martynowski, Łukasz Łaczmański, Jarosław Ciekot, Bogumiła Szponar, Angelina Wójcik‐Fatla, Barbara Mackiewicz, Ewelina Farian, Grażyna Cholewa, Alicja Cholewa, Jacek Dutkiewicz
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Microbacterium aquilitoris sp. nov. and Microbacterium gwkjiense sp. nov., isolated from beach
Soon Dong Lee, Hong Lim Yang, Ji-Sun Kim, In Seop Kim
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Microbacterium algihabitans sp. nov., Microbacterium phycohabitans sp. nov., and Microbacterium galbum sp. nov., isolated from dried beach seaweeds
Soon Dong Lee, Hong Lim Yang, In Seop Kim
International Journal of Systematic and Evolutionary Microbiology .2024;[Epub] CrossRef
Association between the gut microbiome and carotenoid plumage phenotype in an avian hybrid zone
Marcella D. Baiz, Andrew W. Wood, David P. L. Toews
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Description of Microbacterium dauci sp. nov., a plant growth hormone indoleacetic acid-producing and nitrogen-fixing bacterium isolated from carrot rhizosphere soil
Jiawen Zheng, Yunyu Liao, Yang Li, Dongsheng Li, Yaping Sun, Zijun Xiao
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Jian Xiao, Tian Liang, Shangdong Yang, Hongwei Tan
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Jun Ren, Junhao Shen, Thi Duc Thai, Min-gyun Kim, Seung Ho Lee, Wonseop Lim, Dokyun Na
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Effects of flavonoids on membrane adaptation of food-associated bacteria
Maria Linden, Alexander Flegler, Michelle M. Feuereisen, Fabian Weber, André Lipski, Andreas Schieber
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Four new Microbacterium species isolated from seaweeds and reclassification of five Microbacterium species with a proposal of Paramicrobacterium gen. nov. under a genome-based framework of the genus Microbacterium
Soon Dong Lee, Hong Lim Yang, In Seop Kim
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Microbacterium Cluster EA Bacteriophages: Phylogenomic Relationships and Host Range Predictions
Mark Milhaven, Cyril J. Versoza, Aman Garg, Lindsey Cai, Sanjana Cherian, Kamalei Johnson, Kevin Salas Perez, Madison Blanco, Jackelyn Lobatos, Corinne Mitra, Maria Strasser, Susanne P. Pfeifer
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Gastrointestinal microbiota alteration induced by Mucor circinelloides in a murine model: Katherine D. Mueller , Hao Zhang , Christian R. Serrano , R. Blake Billmyre , Eun Young Huh , Philipp Wiemann , Nancy P. Keller , Yufeng Wang , Joseph Heitman , Soo Chan Lee; J. Microbiol. 2019;57(6):509-520. Published online May 27, 2019; DOI: https://doi.org/10.1007/s12275-019-8682-x

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Abstract PDF

Mucor circinelloides is a pathogenic fungus and etiologic agent of mucormycosis. In 2013, cases of gastrointestinal illness after yogurt consumption were reported to the US FDA, and the producer found that its products were contaminated with Mucor. A previous study found that the Mucor strain isolated from an open contaminated yogurt exhibited virulence in a murine systemic infection model and showed that this strain is capable of surviving passage through the gastrointestinal tract of mice. In this study, we isolated another Mucor strain from an unopened yogurt that is closely related but distinct from the first Mucor strain and subsequently examined if Mucor alters the gut microbiota in a murine host model. DNA extracted from a ten-day course of stool samples was used to analyze the microbiota in the gastrointestinal tracts of mice exposed via ingestion of Mucor spores. The bacterial 16S rRNA gene and fungal ITS1 sequences obtained were used to identify taxa of each kingdom. Linear regressions revealed that there are changes in bacterial and fungal abundance in the gastrointestinal tracts of mice which ingested Mucor. Furthermore, we found an increased abundance of the bacterial genus Bacteroides and a decreased abundance of the bacteria Akkermansia muciniphila in the gastrointestinal tracts of exposed mice. Measurements of abundances show shifts in relative levels of multiple bacterial and fungal taxa between mouse groups. These findings suggest that exposure of the gastrointestinal tract to Mucor can alter the microbiota and, more importantly, illustrate an interaction between the intestinal mycobiota and bacteriota. In addition, Mucor was able to induce increased permeability in epithelial cell monolayers in vitro, which might be indicative of unstable intestinal barriers. Understanding how the gut microbiota is shaped is important to understand the basis of potential methods of treatment for gastrointestinal illness. How the gut microbiota changes in response to exposure, even by pathogens not considered to be causative agents of food-borne illness, may be important to how commercial food producers prevent and respond to contamination of products aimed at the public. This study provides evidence that the fungal microbiota, though understudied, may play an important role in diseases of the human gut.

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