MicrobiologyOpen最新文献

{"title":"Isolation and characterization of filamentous fungi capable of degrading the mycotoxin patulin","authors":"Megumi Mita,&nbsp;Rina Sato,&nbsp;Miho Kakinuma,&nbsp;Hiroyuki Nakagawa,&nbsp;Toshiki Furuya","doi":"10.1002/mbo3.1373","DOIUrl":"10.1002/mbo3.1373","url":null,"abstract":"<p>Patulin is a toxic secondary metabolite synthesized by various fungal strains. This mycotoxin is generally toxic to microorganisms as well as mammals due to its reactivity with the important cellular antioxidant glutathione. In this study, we explored the presence of microorganisms capable of degrading patulin. Microorganisms were screened for the ability to both grow in culture medium containing patulin and reduce its concentration. Screening of 510 soil samples resulted in the isolation of two filamentous fungal strains, one of which, <i>Acremonium</i> sp. TUS-MM1 was characterized in detail. Liquid chromatography-mass spectrometry and nuclear magnetic resonance analyses revealed that TUS-MM1 cells degraded patulin to desoxypatulinic acid. In addition, extracellular components of strain TUS-MM1 also exhibited patulin-transforming activity. High-performance liquid chromatography analysis revealed that the extracellular components generated several products from patulin. Disc diffusion assay using <i>Escherichia coli</i> cells revealed that the patulin-transformation products by the extracellular components are less toxic than patulin. We also demonstrated that a thermostable, low-molecular-weight compound within the extracellular components was responsible for the patulin-transforming activity. These results suggest that strain TUS-MM1 transforms patulin into less-toxic molecules by secreting a highly reactive compound. In addition, once patulin enters the cells, strain TUS-MM1 can transform it into desoxypatulinic acid to reduce its toxicity.</p>","PeriodicalId":18573,"journal":{"name":"MicrobiologyOpen","volume":"12 4","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mbo3.1373","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10141162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isolation, biochemical characterization, and genome sequencing of two high-quality genomes of a novel chitinolytic Jeongeupia species","authors":"Nathanael D. Arnold,&nbsp;Daniel Garbe,&nbsp;Thomas B. Brück","doi":"10.1002/mbo3.1372","DOIUrl":"10.1002/mbo3.1372","url":null,"abstract":"<p>Chitin is the second most abundant polysaccharide worldwide as part of arthropods' exoskeletons and fungal cell walls. Low concentrations in soils and sediments indicate rapid decomposition through chitinolytic organisms in terrestrial and aquatic ecosystems. The enacting enzymes, so-called chitinases, and their products, chitooligosaccharides, exhibit promising characteristics with applications ranging from crop protection to cosmetics, medical, textile, and wastewater industries. Exploring novel chitinolytic organisms is crucial to expand the enzymatical toolkit for biotechnological chitin utilization and to deepen our understanding of diverse catalytic mechanisms. In this study, we present two long-read sequencing-based genomes of highly similar <i>Jeongeupia</i> species, which have been screened, isolated, and biochemically characterized from chitin-amended soil samples. Through metabolic characterization, whole-genome alignments, and phylogenetic analysis, we could demonstrate how the investigated strains differ from the taxonomically closest strain <i>Jeongeupia naejangsanensis</i> BIO-TAS4-2^T (DSM 24253). In silico analysis and sequence alignment revealed a multitude of highly conserved chitinolytic enzymes in the investigated <i>Jeongeupia</i> genomes. Based on these results, we suggest that the two strains represent a novel species within the genus of <i>Jeongeupia</i>, which may be useful for environmentally friendly <i>N</i>-acetylglucosamine production from crustacean shell or fungal biomass waste or as a crop protection agent.</p>","PeriodicalId":18573,"journal":{"name":"MicrobiologyOpen","volume":"12 4","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mbo3.1372","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10149742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Co-localization of clinically relevant antibiotic- and heavy metal resistance genes on plasmids in Klebsiella pneumoniae from marine bivalves","authors":"Fredrik Håkonsholm,&nbsp;Marit A. K. Hetland,&nbsp;Iren H. Löhr,&nbsp;Bjørn Tore Lunestad,&nbsp;Nachiket P. Marathe","doi":"10.1002/mbo3.1368","DOIUrl":"10.1002/mbo3.1368","url":null,"abstract":"<p><i>Klebsiella pneumoniae</i> is an opportunistic pathogen frequently associated with antibiotic resistance and present in a wide range of environments, including marine habitats. However, little is known about the development, persistence, and spread of antibiotic resistance in such environments. This study aimed to obtain the complete genome sequences of antibiotic-resistant <i>K. pneumoniae</i> isolated from marine bivalves in order to determine the genetic context of antibiotic- and heavy metal resistance genes in these isolates. Five antibiotic-resistant <i>K. pneumoniae</i> isolates, of which four also carried heavy metal resistance genes, were selected for complete genome sequencing using the Illumina MiSeq platform and the Oxford Nanopore Technologies GridION device. Conjugation experiments were conducted to examine the transfer potential of selected plasmids. The average length of the complete genomes was 5.48 Mbp with a mean chromosome size of 5.27 Mbp. Seven plasmids were detected in the antibiotic-resistant isolates. Three IncFIB, one IncFIB/IncFII, and one IncFIB/IncHIB plasmid, respectively, carried antibiotic resistance genes such as <i>qnrS1, aph(6)-Id</i> and <i>aph(3′)-Ia, aadA1</i>, and <i>aadA2</i>. Four of these plasmids also carried genes encoding resistance to copper (<i>pco</i>), silver (<i>sil</i>), and arsenic (<i>ars</i>). One plasmid carrying <i>tet(D</i>) and <i>bla</i>_SHV-1 as well as <i>pco, sil</i>, and <i>ars</i> genes was transferred to <i>Escherichia coli</i> by conjugation. We show the co-occurrence of antibiotic- and heavy metal resistance genes on a conjugative IncFIB plasmid from <i>K. pneumoniae</i> from marine bivalves. Our study highlights the importance of the marine environment and seafood as a possible dissemination route for antimicrobial resistance and provides insights into the potential for co-selection of antibiotic resistance genes by heavy metals.</p>","PeriodicalId":18573,"journal":{"name":"MicrobiologyOpen","volume":"12 4","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mbo3.1368","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10141166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isolation and functional analysis of phage-displayed antibody fragments targeting the staphylococcal superantigen-like proteins","authors":"Ida Alanko,&nbsp;Rebecca Sandberg,&nbsp;Eeva-Christine Brockmann,&nbsp;Carla J. C. de Haas,&nbsp;Jos A. G. van Strijp,&nbsp;Urpo Lamminmäki,&nbsp;Outi M. H. Salo-Ahen","doi":"10.1002/mbo3.1371","DOIUrl":"10.1002/mbo3.1371","url":null,"abstract":"<p><i>Staphylococcus aureus</i> produces numerous virulence factors that manipulate the immune system, helping the bacteria avoid phagocytosis. In this study, we are investigating three immune evasion molecules called the staphylococcal superantigen-like proteins 1, 5, and 10 (SSL1, SSL5, and SSL10). All three SSLs inhibit vital host immune processes and contribute to <i>S</i>. <i>aureus</i> immune evasion. This study aimed to identify single-chain variable fragment (scFvs) antibodies from synthetic antibody phage libraries, which can recognize either of the three SSLs and could block the interaction between the SSLs and their respective human targets. The antibodies were isolated after three rounds of panning against SSL1, SSL5, and SSL10, and their ability to bind to the SSLs was studied using a time-resolved fluorescence-based immunoassay. We successfully obtained altogether 44 unique clones displaying binding activity to either SSL1, SSL5, or SSL10. The capability of the SSL-recognizing scFvs to inhibit the SSLs' function was tested in an MMP9 enzymatic activity assay, a P-selectin glycoprotein ligand 1 competitive binding assay, and an IgG1-mediated phagocytosis assay. We could show that one scFv was able to inhibit SSL1 and maintain MMP9 activity in a concentration-dependent manner. Finally, the structure of this inhibiting scFv was modeled and used to create putative scFv-SSL1-complex models by protein–protein docking. The complex models were subjected to a 100-ns molecular dynamics simulation to assess the possible binding mode of the antibody.</p>","PeriodicalId":18573,"journal":{"name":"MicrobiologyOpen","volume":"12 4","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mbo3.1371","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10149741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Clay-associated microbial communities and their relevance for a nuclear waste repository in the Opalinus Clay rock formation","authors":"Julia Mitzscherling,&nbsp;Steffi Genderjahn,&nbsp;Anja M. Schleicher,&nbsp;Alexander Bartholomäus,&nbsp;Jens Kallmeyer,&nbsp;Dirk Wagner","doi":"10.1002/mbo3.1370","DOIUrl":"10.1002/mbo3.1370","url":null,"abstract":"<p>Microorganisms are known to be natural agents of biocorrosion and mineral transformation, thereby potentially affecting the safety of deep geological repositories used for high-level nuclear waste storage. To better understand how resident microbial communities of the deep terrestrial biosphere may act on mineralogical and geochemical characteristics of insulating clays, we analyzed their structure and potential metabolic functions, as well as site-specific mineralogy and element composition from the dedicated Mont Terri underground research laboratory, Switzerland. We found that the Opalinus Clay formation is mainly colonized by Alphaproteobacteria, Firmicutes, and Bacteroidota, which are known for corrosive biofilm formation. Potential iron-reducing bacteria were predominant in comparison to methanogenic archaea and sulfate-reducing bacteria. Despite microbial communities in Opalinus Clay being in majority homogenous, site-specific mineralogy and geochemistry conditions have selected for subcommunities that display metabolic potential for mineral dissolution and transformation. Our findings indicate that the presence of a potentially low-active mineral-associated microbial community must be further studied to prevent effects on the repository's integrity over the long term.</p>","PeriodicalId":18573,"journal":{"name":"MicrobiologyOpen","volume":"12 4","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mbo3.1370","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10141165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphological and physiological impacts of salinity on colonial strains of the cyanobacteria Microcystis aeruginosa","authors":"Myriam Bormans,&nbsp;Benjamin Legrand,&nbsp;Nicolas Waisbord,&nbsp;Enora Briand","doi":"10.1002/mbo3.1367","DOIUrl":"10.1002/mbo3.1367","url":null,"abstract":"<p>In the context of global change and enhanced toxic cyanobacterial blooms, cyanobacterial transfer to estuaries is likely to increase in frequency and intensity and impact animal and human health. Therefore, it is important to evaluate the potential of their survival in estuaries. In particular, we tested if the colonial form generally observed in natural blooms enhanced the resistance to salinity shock compared to the unicellular form generally observed in isolated strains. We tested the impact of salinity on two colonial strains of <i>Microcystis aeruginosa</i>, producing different amounts of mucilage by combining classical batch methods with a novel microplate approach. We demonstrate that the collective organization of these pluricellular colonies improves their ability to cope with osmotic shock when compared to unicellular strains. The effect of a sudden high salinity increase (<i>S</i> ≥ 20) over 5 to 6 days had several impacts on the morphology of <i>M. aeruginosa</i> colonies. For both strains, we observed a gradual increase in colony size and a gradual decrease in intercellular spacing. For one strain, we also observed a decrease in cell diameter with an increase in mucilage extent. The pluricellular colonies formed by both strains could withstand higher salinities than unicellular strains studied previously. In particular, the strain producing more mucilage displayed a sustained autofluorescence even at <i>S</i> = 20, a limit that is higher than the most robust unicellular strain. These results imply survival and possible <i>M. aeruginosa</i> proliferation in mesohaline estuaries.</p>","PeriodicalId":18573,"journal":{"name":"MicrobiologyOpen","volume":"12 3","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mbo3.1367","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9731858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An improved method for intracellular DNA (iDNA) recovery from terrestrial environments","authors":"Diego Medina Caro,&nbsp;Lucas Horstmann,&nbsp;Lars Ganzert,&nbsp;Romulo Oses,&nbsp;Thomas Friedl,&nbsp;Dirk Wagner","doi":"10.1002/mbo3.1369","DOIUrl":"10.1002/mbo3.1369","url":null,"abstract":"<p>The simultaneous extraction of intracellular DNA (iDNA) and extracellular DNA (eDNA) can help to separate the living in situ community (represented by iDNA) from background DNA that originated both from past communities and from allochthonous sources. As iDNA and eDNA extraction protocols require separating cells from the sample matrix, their DNA yields are generally lower than direct methods that lyse the cells within the sample matrix. We, therefore, tested different buffers with and without adding a detergent mix (DM) in the extraction protocol to improve the recovery of iDNA from surface and subsurface samples that covered a variety of terrestrial environments. The combination of a highly concentrated sodium phosphate buffer plus DM significantly improved iDNA recovery for almost all tested samples. Additionally, the combination of sodium phosphate and EDTA improved iDNA recovery in most of the samples and even allowed the successful extraction of iDNA from extremely low-biomass iron-bearing rock samples taken from the deep biosphere. Based on our results, we recommend using a protocol with sodium phosphate in combination with either a DM (NaP 300 mM + DM) or EDTA (NaP + EDTA 300 mM). Furthermore, for studies that rely on the eDNA pool, we recommend using buffers solely based on sodium phosphate because the addition of EDTA or a DM resulted in a decrease in eDNA for most of the tested samples. These improvements can help reduce community bias in environmental studies and contribute to better characterizations of both modern and past ecosystems.</p>","PeriodicalId":18573,"journal":{"name":"MicrobiologyOpen","volume":"12 3","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mbo3.1369","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9726448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Genome comparison reveals that Halobacterium salinarum 63-R2 is the origin of the twin laboratory strains NRC-1 and R1","authors":"Friedhelm Pfeiffer,&nbsp;Mike Dyall-Smith","doi":"10.1002/mbo3.1365","DOIUrl":"10.1002/mbo3.1365","url":null,"abstract":"<p>The genome of <i>Halobacterium</i> strain 63-R2 was recently reported and provides the opportunity to resolve long-standing issues regarding the source of two widely used model strains of <i>Halobacterium salinarum</i>, NRC-1 and R1. Strain 63-R2 was isolated in 1934 from a salted buffalo hide (epithet “cutirubra”), along with another strain from a salted cow hide (91-R6^T, epithet “salinaria,” the type strain of <i>Hbt. salinarum</i>). Both strains belong to the same species according to genome-based taxonomy analysis (TYGS), with chromosome sequences showing 99.64% identity over 1.85 Mb. The chromosome of strain 63-R2 is 99.99% identical to the two laboratory strains NRC-1 and R1, with only five indels, excluding the mobilome. The two reported plasmids of strain 63-R2 share their architecture with plasmids of strain R1 (pHcu43/pHS4, 99.89% identity; pHcu235/pHS3, 100.0% identity). We detected and assembled additional plasmids using PacBio reads deposited at the SRA database, further corroborating that strain differences are minimal. One plasmid, pHcu190 (190,816 bp) corresponds to pHS1 (strain R1) but is even more similar in architecture to pNRC100 (strain NRC-1). Another plasmid, pHcu229, assembled partially and completed in silico (229,124 bp), shares most of its architecture with pHS2 (strain R1). In deviating regions, it corresponds to pNRC200 (strain NRC-1). Further architectural differences between the laboratory strain plasmids are not unique, but are present in strain 63-R2, which contains characteristics from both of them. Based on these observations, it is proposed that the early twentieth-century isolate 63-R2 is the immediate ancestor of the twin laboratory strains NRC-1 and R1.</p>","PeriodicalId":18573,"journal":{"name":"MicrobiologyOpen","volume":"12 3","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mbo3.1365","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9728776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aedes albopictus microbiome derives from environmental sources and partitions across distinct host tissues","authors":"Priscilla S. Seabourn,&nbsp;Danya E. Weber,&nbsp;Helen Spafford,&nbsp;Matthew C. I. Medeiros","doi":"10.1002/mbo3.1364","DOIUrl":"10.1002/mbo3.1364","url":null,"abstract":"<p>The mosquito microbiome consists of a consortium of interacting microorganisms that reside on and within culicid hosts. Mosquitoes acquire most of their microbial diversity from the environment over their life cycle. Once present within the mosquito host, the microbes colonize distinct tissues, and these symbiotic relationships are maintained by immune-related mechanisms, environmental filtering, and trait selection. The processes that govern how environmental microbes assemble across the tissues within mosquitoes remain poorly resolved. We use ecological network analyses to examine how environmental bacteria assemble to form bacteriomes among <i>Aedes albopictus</i> host tissues. Mosquitoes, water, soil, and plant nectar were collected from 20 sites in the Mānoa Valley, Oahu. DNA was extracted and associated bacteriomes were inventoried using Earth Microbiome Project protocols. We find that the bacteriomes of <i>A. albopictus</i> tissues were compositional taxonomic subsets of environmental bacteriomes and suggest that the environmental microbiome serves as a source pool that supports mosquito microbiome diversity. Within the mosquito, the microbiomes of the crop, midgut, Malpighian tubules, and ovaries differed in composition. This microbial diversity partitioned among host tissues formed two specialized modules: one in the crop and midgut, and another in the Malpighian tubules and ovaries. The specialized modules may form based on microbe niche preferences and/or selection of mosquito tissues for specific microbes that aid unique biological functions of the tissue types. A strong niche-driven assembly of tissue-specific microbiotas from the environmental species pool suggests that each tissue has specialized associations with microbes, which derive from host-mediated microbe selection.</p>","PeriodicalId":18573,"journal":{"name":"MicrobiologyOpen","volume":"12 3","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mbo3.1364","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9726450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential impacts of environmental bacteria on the microbiota of loggerhead (Caretta caretta) and green (Chelonia mydas) sea turtle eggs and their hatching success","authors":"Colleen M. McMaken,&nbsp;Derek A. Burkholder,&nbsp;Rosanna J. Milligan,&nbsp;Jose V. Lopez","doi":"10.1002/mbo3.1363","DOIUrl":"10.1002/mbo3.1363","url":null,"abstract":"<p>Sea turtle hatching success can be affected by many variables, including pathogenic microbes, but it is unclear which microbes are most impactful and how they are transmitted into the eggs. This study characterized and compared the bacterial communities from the (i) cloaca of nesting sea turtles (ii) sand within and surrounding the nests; and (iii) hatched and unhatched eggshells from loggerhead (<i>Caretta caretta</i>) and green (<i>Chelonia mydas</i>) turtles. High throughput sequencing of bacterial 16S ribosomal RNA gene V4 region amplicons was performed on samples collected from 27 total nests in Fort Lauderdale and Hillsboro beaches in southeast Florida, United States. Significant differences were identified between hatched and unhatched egg microbiota with the differences caused predominately by <i>Pseudomona</i>s spp., found in higher abundances in unhatched eggs (19.29% relative abundance) than hatched eggs (1.10% relative abundance). Microbiota similarities indicate that the nest sand environment, particularly nest distance from dunes, played a larger role than the nesting mother's cloaca in influencing hatched and unhatched egg microbiota. Pathogenic bacteria potentially derive from mixed-mode transmission or additional sources not included in this study as suggested by the high proportion (24%–48%) of unhatched egg microbiota derived from unknown sources. Nonetheless, the results suggest <i>Pseudomonas</i> as a candidate pathogen or opportunistic colonizer associated with sea turtle egg-hatching failure.</p>","PeriodicalId":18573,"journal":{"name":"MicrobiologyOpen","volume":"12 3","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mbo3.1363","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9731855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}