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  • 1
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 88, No. 4 ( 2022-02-22)
    Abstract: Analysis of the de novo assembled genome of Mammaliicoccus sciuri IMDO-S72 revealed the genetically encoded machinery behind its earlier reported antibacterial phenotype and gave further insight into the repertoire of putative virulence factors of this recently reclassified species. A plasmid-encoded biosynthetic gene cluster was held responsible for the antimicrobial activity of M. sciuri IMDO-S72, comprising genes involved in thiopeptide production. The compound encoded by this gene cluster was structurally identified as micrococcin P1. Further examination of its genome highlighted the ubiquitous presence of innate virulence factors mainly involved in surface colonization. Determinants contributing to aggressive virulence were generally absent, with the exception of a plasmid-associated ica cluster. The native antibiotic resistance genes sal (A) and mecA were detected within the genome, among others, but were not consistently linked with a resistance phenotype. While mobile genetic elements were identified within the genome, such as an untypeable staphylococcal cassette chromosome (SCC) element, they proved to be generally free of virulence- and antibiotic-related genes. These results further suggest a commensal lifestyle of M. sciuri and indicate the association of antibiotic resistance determinants with mobile genetic elements as an important factor in conferring antibiotic resistance, in addition to their unilateral annotation. IMPORTANCE Mammaliicoccus sciuri has been put forward as an important carrier of virulence and antibiotic resistance genes, which can be transmitted to clinically important staphylococcal species such as Staphylococcus aureus . As a common inhabitant of mammal skin, this species is believed to have a predominant commensal lifestyle, although it has been reported as an opportunistic pathogen in some cases. This study provides an extensive genome-wide description of its putative virulence potential taking into consideration the genomic context in which these genes appear, an aspect that is often overlooked during virulence analysis. Additional genome and biochemical analysis linked M. sciuri with the production of micrococcin P1, gaining further insight into the extent to which these biosynthetic gene clusters are distributed among different related species. The frequent plasmid-associated character hints that these traits can be horizontally transferred and might confer a competitive advantage to its recipient within its ecological niche.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    RVK:
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2022
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    detail.hit.zdb_id: 1478346-0
    SSG: 12
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  • 2
    In: Frontiers in Microbiology, Frontiers Media SA, Vol. 11 ( 2020-7-17)
    Type of Medium: Online Resource
    ISSN: 1664-302X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2020
    detail.hit.zdb_id: 2587354-4
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  • 3
    Online Resource
    Online Resource
    Elsevier BV ; 2020
    In:  Food Microbiology Vol. 89 ( 2020-08), p. 103448-
    In: Food Microbiology, Elsevier BV, Vol. 89 ( 2020-08), p. 103448-
    Type of Medium: Online Resource
    ISSN: 0740-0020
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2020
    detail.hit.zdb_id: 1467522-5
    SSG: 12
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  • 4
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    Online Resource
    Frontiers Media SA ; 2022
    In:  Frontiers in Microbiology Vol. 13 ( 2022-7-11)
    In: Frontiers in Microbiology, Frontiers Media SA, Vol. 13 ( 2022-7-11)
    Abstract: The fiber, vitamin, and antioxidant contents of fruits contribute to a balanced human diet. In countries such as Argentina, several tropical fruits are witnessing a high yield in the harvest season, with a resulting surplus. Fruit fermentation using autochthonous starter cultures can provide a solution for food waste. However, limited knowledge exists about the microbiota present on the surfaces of fruits and the preceding flowers. In the present exploratory study, the microbiomes associated with the surfaces of tropical fruits from Northern Argentina, such as white guava, passion fruit and papaya were investigated using a shotgun metagenomic sequencing approach. Hereto, one sample composed of 14 white guava fruits, two samples of passion fruits with each two to three fruits representing the almost ripe and ripe stage of maturity, four samples of papaya with each two to three fruits representing the unripe, almost ripe, and ripe stage of maturity were processed, as well as a sample of closed and a sample of open Japanese medlar flowers. A considerable heterogeneity was found in the composition of the fruits’ surface microbiota at the genus and species level. While bacteria dominated the microbiota of the fruits and flowers, a small number of the metagenomic sequence reads corresponded with yeasts and filamentous fungi. A minimal abundance of bacterial species critical in lactic acid and acetic acid fermentations was found. A considerable fraction of the metagenomic sequence reads from the fruits’ surface microbiomes remained unidentified, which suggested that intrinsic species are to be sequenced or discovered.
    Type of Medium: Online Resource
    ISSN: 1664-302X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
    detail.hit.zdb_id: 2587354-4
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  • 5
    Online Resource
    Online Resource
    Frontiers Media SA ; 2019
    In:  Frontiers in Microbiology Vol. 10 ( 2019-3-13)
    In: Frontiers in Microbiology, Frontiers Media SA, Vol. 10 ( 2019-3-13)
    Type of Medium: Online Resource
    ISSN: 1664-302X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2019
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  • 6
    Online Resource
    Online Resource
    Frontiers Media SA ; 2020
    In:  Frontiers in Microbiology Vol. 11 ( 2020-7-15)
    In: Frontiers in Microbiology, Frontiers Media SA, Vol. 11 ( 2020-7-15)
    Type of Medium: Online Resource
    ISSN: 1664-302X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2020
    detail.hit.zdb_id: 2587354-4
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  • 7
    Online Resource
    Online Resource
    Frontiers Media SA ; 2021
    In:  Frontiers in Microbiology Vol. 11 ( 2021-1-11)
    In: Frontiers in Microbiology, Frontiers Media SA, Vol. 11 ( 2021-1-11)
    Abstract: Starter culture-initiated cocoa fermentation processes can be applied to improve the quality of cured cocoa beans. However, an accurate monitoring of the microbial strains inoculated in fresh cocoa pulp-bean mass to assess their contribution to the cocoa bean curing process is still lacking. In the present study, eight different cocoa fermentation processes were carried out with Trinitario cocoa in vessels in Costa Rica to assess the contribution of two candidate yeast starter culture strains, namely Saccharomyces cerevisiae IMDO 050523 and Pichia kudriavzevii IMDO 020508, inoculated in combination with Limosilactobacillus fermentum IMDO 0611222 and Acetobacter pasteurianus IMDO 0506386. A multiphasic approach, consisting of culture-dependent selective plating and incubation, rRNA-PCR-DGGE community profiling of agar plate washes, and culture-independent high-throughput amplicon sequencing, combined with a metabolite target analysis of non-volatile and volatile organic compounds (VOCs), was performed on samples from the fermentation and/or drying steps. The different starter culture mixtures applied effectively steered the cocoa fermentation processes performed. Moreover, the use of an amplicon sequence variant (ASV) approach, aligning these ASVs to the whole-genome sequences of the inoculated strains, allowed the monitoring of these inoculated strains and their differentiation from very closely related variants naturally present in the background or spontaneous fermentation processes. Further, traits such as malolactic fermentation during the fermentation step and acetoin and tetramethylpyrazine formation during the drying step could be unraveled. Finally, the yeast strains inoculated influenced the substrate consumption and metabolite production during all starter culture-initiated fermentation processes. This had an impact on the VOC profiles of the cured cocoa beans. Whereas the P. kudriavzevii strain produced a wide range of VOCs in the cocoa pulp, the S. cerevisiae strain mostly influenced the VOC composition of the cured cocoa beans.
    Type of Medium: Online Resource
    ISSN: 1664-302X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2021
    detail.hit.zdb_id: 2587354-4
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  • 8
    In: Microbiome, Springer Science and Business Media LLC, Vol. 11, No. 1 ( 2023-04-28)
    Abstract: Excessive hedonic consumption is one of the main drivers for weight gain. Identifying contributors of this dysregulation would help to tackle obesity. The gut microbiome is altered during obesity and regulates host metabolism including food intake. Results By using fecal material transplantation (FMT) from lean or obese mice into recipient mice, we demonstrated that gut microbes play a role in the regulation of food reward (i.e., wanting and learning processes associated with hedonic food intake) and could be responsible for excessive motivation to obtain sucrose pellets and alterations in dopaminergic and opioid markers in reward-related brain areas. Through untargeted metabolomic approach, we identified the 3-(3’-hydroxyphenyl)propanoic acid (33HPP) as highly positively correlated with the motivation. By administrating 33HPP in mice, we revealed its effects on food reward. Conclusions Our data suggest that targeting the gut microbiota and its metabolites would be an interesting therapeutic strategy for compulsive eating, preventing inappropriate hedonic food intake.
    Type of Medium: Online Resource
    ISSN: 2049-2618
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2697425-3
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  • 9
    In: iScience, Elsevier BV, Vol. 25, No. 11 ( 2022-11), p. 105309-
    Type of Medium: Online Resource
    ISSN: 2589-0042
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2022
    detail.hit.zdb_id: 2927064-9
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  • 10
    In: JPGN Reports, Ovid Technologies (Wolters Kluwer Health), Vol. 4, No. 3 ( 2023-07-17), p. e334-
    Abstract: Autoimmune hepatitis and primary sclerosing cholangitis (PSC) can both be present, resulting in autoimmune sclerosing cholangitis (ASC). PSC physiopathology could be based on the cross-talk between gut microbiota and bile acids (BAs); antibiotics are an innovative therapy. This pilot study assesses metronidazole (MTZ)’s effectiveness in ASC or PSC patients according to the stage of the disease, and its effects on biochemical parameters, BA profiles, and gut microbiota. Methods: ASC or PSC patients from Cliniques universitaires Saint-Luc’s pediatric hepato-gastroenterology division were enrolled retrospectively and prospectively; both datasets were merged. MTZ was administered over at least 14 days on top of standard treatment (ursodeoxycholic acid, azathioprine, and steroids). Fecal and blood samples were collected before (T0) and at MTZ day 14 (T14). Sustained biochemical remission was defined by the reduction of transaminases (AST and ALT), gamma-glutamyl transferase (GGT), and CRP until 12 months post-MTZ. Results: A total of 18 patients (mean age, 13.2 ± 4.5 years) were enrolled (13 ASC and 5 PSC), and divided in remission or relapse patients. CRP, AST, ALT, and GGT levels decreased post-MTZ in both groups (excepting GGT in relapse patients), with decreases between T0 and T14 being significant for AST and ALT. Relapse patients were older ( P = 0.0351) and in late-disease stage, with mainly large-duct PSC ( P = 0.0466). In remission patients, the mean plasma relative abundance of hydrophilic BA increased by +6.3% ( P = 0.0391) after MTZ. Neither at baseline nor T14, there were significant differences in gut microbiota recorded. Conclusion: These data are likely indicative of long-term benefits following MTZ therapy at early-stage ASC or PSC, with increased hydrophilic BA abundance. Multicenter prospective studies are needed.
    Type of Medium: Online Resource
    ISSN: 2691-171X
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2023
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