Journal of Microbiology

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Preliminary characterization of the skin microbiota in basal cell carcinoma: An exploratory pilot study in Korean patients: Hye Lim Keum, Woo Jun Sul, Suyeon Kim, In-Young Chung, Ara Koh, Hei Sung Kim; Received November 14, 2025 Accepted December 23, 2025 Published online February 13, 2026; DOI: https://doi.org/10.71150/jm.2511012 [Epub ahead of print]

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Abstract PDF: Basal cell carcinoma (BCC) is the most common form of skin cancer, with ultraviolet radiation recognized as the primary environmental driver; however, the potential contribution of alterations in the skin microbiota remains incompletely understood, particularly in Asian populations. This exploratory pilot study describes bacterial community patterns in BCC lesions compared with contralateral clinically normal skin in 20 Korean patients. Lesional and contralateral samples were obtained using paired skin swabs and punch biopsies and analyzed by full-length 16S rRNA gene sequencing, with targeted quantitative PCR (qPCR) of the roxP antioxidant gene of Cutibacterium acnes. Given the low-biomass nature of skin samples and the exploratory design, analyses focused on descriptive trends rather than confirmatory inference. Across available samples, C. acnes was the dominant taxon, with a trend toward lower relative abundance in BCC lesions, particularly in biopsy-derived datasets. Microbial evenness appeared higher in lesions than controls. Predictive functional profiling suggested reduced representation of vitamin B6 metabolism pathways in lesions, while qPCR analysis of swab samples showed a trend toward lower roxP/16S rRNA ratios in BCC-associated microbiota. These findings should be interpreted cautiously in light of methodological constraints, including sample heterogeneity, lidocaine exposure prior to biopsy, absence of sequencing-based negative controls, and reliance on predictive functional inference. Overall, this pilot study highlights potential differences in skin bacterial community structure between BCC lesions and contralateral skin in a Korean cohort. Larger, methodologically optimized studies incorporating metagenomic and functional validation will be required to determine whether these microbiota shifts contribute to, or result from, BCC-associated changes in the cutaneous environment.

Journal Articles

Repositioning of a mucolytic drug to a selective antibacterial against Vibrio cholerae: In-Young Chung† , Bi-o Kim† , Hye-Jeong Jang† , You-Hee Cho; J. Microbiol. 2020;58(1):61-66. Published online January 2, 2020; DOI: https://doi.org/10.1007/s12275-020-9590-9

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Drug repositioning, the approach to explore existing drugs for use in new therapeutic indications, has emerged as an alternative drug development strategy. In this study, we found that a mucolytic drug, N-acetylcysteine (NAC) showed antibacterial activity against Vibrio cholerae. NAC can provide acid stress that selectively inhibited the growth of V. cholerae among other bacterial pathogens. To address the antibacterial mechanism of NAC against V. cholerae, six acr (acetylcysteine- resistant) mutants were isolated from 3,118 random transposon insertion clones. The transposon insertion sites of the six mutants were mapped at the five genes. All these mutants did not display NAC resistance under acidic conditions, despite their resistance to NAC under alkaline conditions, indicating that the NAC resistance directed by the acr mutations was independent of the unusual pH-sensitivity of V. cholerae. Furthermore, all these mutants displayed attenuated virulence and reduced biofilm formation, suggesting that the acr genes are required for pathogenesis of V. cholerae. This study validates the relevance of drug repositioning for antibacterials with new modes of action and will provide an insight into a novel antibacterial therapy for V. cholerae infections to minimize side effects and resistance emergence.

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Identification of brevinin-1EMa-derived stapled peptides as broad-spectrum virus entry blockers
Mi Il Kim, Thanh K. Pham, Dahee Kim, Minkyung Park, Bi-o Kim, You-Hee Cho, Young-Woo Kim, Choongho Lee
Virology.2021; 561: 6. CrossRef

Differential expression of the major catalase, KatA in the two wild type Pseudomonas aeruginosa strains, PAO1 and PA14: Bi-o Kim , In-Young Chung , You-Hee Cho; J. Microbiol. 2019;57(8):704-710. Published online June 11, 2019; DOI: https://doi.org/10.1007/s12275-019-9225-1

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Abstract PDF

KatA is the major catalase required for hydrogen peroxide (H2O2) resistance and acute virulence in Pseudomonas aeruginosa PA14, whose transcription is governed by its dual promoters (katAp1 and katAp2). Here, we observed that KatA was not required for acute virulence in another wild type P. aeruginosa strain, PAO1, but that PAO1 exhibited higher KatA expression than PA14 did. This was in a good agreement with the observation that PAO1 was more resistant than PA14 to H2O2 as well as to the antibiotic peptide, polymyxin B (PMB), supposed to involve reactive oxygen species (ROS) for its antibacterial activity. The higher KatA expression in PAO1 than in PA14 was attributed to both katAp1 and katAp2 transcripts, as assessed by S1 nuclease mapping. In addition, it was confirmed that the PMB resistance is attributed to both katAp1 and katAp2 in a complementary manner in PA14 and PAO1, by exploiting the promoter mutants for each -10 box (p1m, p2m, and p1p2m). These results provide an evidence that the two widely used P. aeruginosa strains display different virulence mechanisms associated with OxyR and Anr, which need to be further characterized for better understanding of the critical virulence pathways that may differ in various P. aeruginosa strains.

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Review

REVIEW] Antibacterial strategies inspired by the oxidative stress and response networks: So Youn Kim , Chanseop Park , Hye-Jeong Jang , Bi-o Kim , Hee-Won Bae , In-Young Chung , Eun Sook Kim , You-Hee Cho; J. Microbiol. 2019;57(3):203-212. Published online February 26, 2019; DOI: https://doi.org/10.1007/s12275-019-8711-9

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Abstract PDF

Oxidative stress arises from an imbalance between the excessive accumulation of reactive oxygen species (ROS) and a cell’s capability to readily detoxify them. Although ROS are spontaneously generated during the normal oxygen respiration and metabolism, the ROS generation is usually augmented by redox-cycling agents, membrane disrupters, and bactericidal antibiotics, which contributes their antimicrobial bioactivity. It is noted that all the bacteria deploy an arsenal of inducible antioxidant defense systems to cope with the devastating effect exerted by the oxidative stress: these systems include the antioxidant effectors such as catalases and the master regulators such as OxyR. The oxidative stress response is not essential for normal growth, but critical to survive the oxidative stress conditions that the bacterial pathogens may encounter due to the host immune response and/or the antibiotic treatment. Based on these, we here define the ROS-inspired antibacterial strategies to enhance the oxidative stress of ROS generation and/or to compromise the bacterial response of ROS detoxification, by delineating the ROSgenerating antimicrobials and the core concept of the bacterial response against the oxidative stress.

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Journal Article

[PROTOCOL] Drosophila melanogaster as a polymicrobial infection model for Pseudomonas aeruginosa and Staphylococcus aureus: Young-Joon Lee , Hye-Jeong Jang , In-Young Chung , You-Hee Cho; J. Microbiol. 2018;56(8):534-541. Published online July 25, 2018; DOI: https://doi.org/10.1007/s12275-018-8331-9

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Abstract PDF

Non-mammalian infection models have been developed over the last two decades, which is a historic milestone to understand the molecular basis of bacterial pathogenesis. They also provide small-scale research platforms for identification of virulence factors, screening for antibacterial hits, and evaluation of antibacterial efficacy. The fruit fly, Drosophila melanogaster is one of the model hosts for a variety of bacterial pathogens, in that the innate immunity pathways and tissue physiology are highly similar to those in mammals. We here present a relatively simple protocol to assess the key aspects of the polymicrobial interaction in vivo between the human opportunistic pathogens, Pseudomonas aeruginosa and Staphylococcus aureus, which is based on the systemic infection by needle pricking at the dorsal thorax of the flies. After infection, fly survival and bacteremia over time for both P. aeruginosa and S. aureus within the infected flies can be monitored as a measure of polymicrobial virulence potential. The infection takes ~24 h including bacterial cultivation. Fly survival and bacteremia are assessed using the infected flies that are monitored up to ~60 h post-infection. These methods can be used to identify presumable as well as unexpected phenotypes during polymicrobial interaction between P. aeruginosa and S. aureus mutants, regarding bacterial pathogenesis and host immunity.

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Research Support, Non-U.S. Gov't

Superinfection Exclusion Reveals Heteroimmunity between Pseudomonas aeruginosa Temperate Phages: In-Young Chung , Hee-Won Bae , Hye-Jung Jang , Bi-o Kim , You-Hee Cho; J. Microbiol. 2014;52(6):515-520. Published online May 29, 2014; DOI: https://doi.org/10.1007/s12275-014-4012-5

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Abstract PDF

Temperate siphophages (MP29, MP42, and MP48) were isolated from the culture supernatant of clinical Pseudomonas aeruginosa isolates. The complete nucleotide sequences and annotation of the phage genomes revealed the overall synteny to the known temperate P. aeruginosa phages such as MP22, D3112, and DMS3. Genome-level sequence analysis showed the conservation of both ends of the linear genome and the divergence at the previously identified dissimilarity regions (R1 to R9). Protein sequence alignment of the c repressor (ORF1) of each phage enabled us to divide the six phages into two groups: D3112 group (D3112, MP29, MP42, and MP48) and MP22 group (MP22 and DMS3). Superinfection exclusion was observed between the phages belonging to the same group, which was mediated by the specific interaction between the c repressor and the cognate operator. Based on these, we suggest that the temperate siphophages prevalent in the clinical strains of P. aeruginosa represent at least two distinct heteroimmunity groups.

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