Journal of Microbiology

Journal Articles

Mammaliicoccus sciuri's Pan-Immune System and the Dynamics of Horizontal Gene Transfer among Staphylococcaceae: a One-Health CRISPR Tale: Allan de Carvalho, Marcia Giambiagi-deMarval, Ciro César Rossi; J. Microbiol. 2024;62(9):775-784. Published online July 22, 2024; DOI: https://doi.org/10.1007/s12275-024-00156-7

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Recently emancipated from the Staphylococcus genus due to genomic differences, Mammaliicoccus sciuri, previously classified as an occasional pathogen, emerges as a significant player in the landscape of resistance gene dissemination among Staphylococcaceae. Despite its classification, its role remained enigmatic. In this study, we delved into the genomic repertoire of M. sciuri to unravel its contribution to resistance and virulence gene transfer in the context of One Health. Through comprehensive analysis of publicly available genomes, we unveiled a diverse pan-immune system adept at defending against exogenous genetic elements, yet concurrently fostering horizontal gene transfer (HGT). Specifically, exploration of CRISPR-Cas systems, with spacer sequences as molecular signatures, elucidated a global dissemination pattern spanning environmental, animal, and human hosts. Notably, we identified the integration of CRISPR-Cas systems within SCCmecs (Staphylococcal Cassette Chromosome mec), harboring key genes associated with pathogenicity and resistance, especially the methicillin resistance gene mecA, suggesting a strategic adaptation to outcompete other mobile genetic elements. Our findings underscored M. sciuri's active engagement in HGT dynamics and evolutionary trajectories within Staphylococcaceae, emphasizing its central role in shaping microbial communities and highlighting the significance of understanding its implications in the One Health framework, an interdisciplinary approach that recognizes the interconnectedness of human, animal, and environmental health to address global health challenges.

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Staphylococcal phages as agents of evolution and innovation: From gene flow to next-generation therapeutics
Ciro César Rossi, Felipe Castro Oliveira de Brito Teixeira, Giarlã Cunha da Silva, Monalessa Fábia Pereira, Marcia Giambiagi-deMarval
Genetics and Molecular Biology.2026;[Epub] CrossRef
pTJK, a rare Mammaliicoccus lentus phage with broad-host-range, antibiofilm, and synergistic interactions with antimicrobials against resistant Staphylococcaceae
Faizan Ahmad, Pedro Rocha Garcia, Vitor Emanuel Lanes Viana, Sandy de Almada Estanislau, Nohman Rasheed, Rafael Reis de Rezende, Eduardo Luís Menezes de Almeida, Poliane Alfenas Zerbini, Marisa Alves Nogueira Diaz, Monalessa Fábia Pereira, Marcia Giambiag
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Discovery of phage CSF, a novel generalist bacteriophage targeting multidrug-resistant and potentially pathogenic Staphylococcus spp. and Mammaliicoccus spp.
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Identification and Methicillin Resistance of Coagulase-Negative Staphylococci Isolated from Nasal Cavity of Healthy Horses: Jolanta Karakulska , Karol Fijałkowski , Paweł Nawrotek , Anna Pobucewicz , Filip Poszumski , Danuta Czernomysy-Furowicz; J. Microbiol. 2012;50(3):444-451. Published online June 30, 2012; DOI: https://doi.org/10.1007/s12275-012-1550-6

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The aim of this study was an analysis of the staphylococcal flora of the nasal cavity of 42 healthy horses from 4 farms, along with species identification of CoNS isolates and determination of resistance to 18 antimicrobial agents, particularly phenotypic and genotypic methicillin resistance. From the 81 swabs, 87 staphylococci were isolated. All isolates possessed the gap gene but the coa gene was not detected in any of these isolates. Using PCR-RFLP of the gap gene, 82.8% of CoNS were identified: S. equorum (14.9%), S. warneri (14.9%), S. sciuri (12.6%), S. vitulinus (12.6%), S. xylosus (11.5% ), S. felis (5.7%), S. haemolyticus (3.4%), S. simulans(3.4%), S. capitis (1.1%), S. chromogenes (1.1%), and S. cohnii subsp. urealyticus (1.1%). To our knowledge, this was the first isolation of S. felis from a horse. The species identity of the remaining Staphylococcus spp. isolates (17.2%) could not be determined from the gap gene PCR-RFLP analysis and 16S rRNA gene sequencing data. Based on 16S-23S intergenic transcribed spacer PCR, 11 different ITS-PCR profiles were identified for the 87 analyzed isolates. Results of API Staph were consistent with molecular identification of 17 (19.5%) isolates. Resistance was detected to only 1 or 2 of the 18 antimicrobial agents tested in the 17.2% CoNS isolates, including 6.9% MRCoNS. The mecA gene was detected in each of the 5 (5.7%) phenotypically cefoxitin-resistant isolates and in 12 (13.8%) isolates susceptible to cefoxitin. In total, from 12 horses (28.6%), 17 (19.5%) MRCoNS were isolated. The highest percentage of MRCoNS was noted among S. sciuri isolates (100%).

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