Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"Horizontal Gene Transfer (HGT)"”.
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HORIZONTAL GENE TRANSFER (HGT) AND SPHAGNUM FALLAX: A PHYLOGENETIC LOOK INTO THE OCCURRENCE, PREVALENCE, AND IMPORTANCE OF HORIZONTAL GENE TRANSFER IN A BOG MOSS
Horizontal gene transfer (HGT) is a biological process that involves any transmission of genetic material that isn't vertical in nature. HGT occurs frequently between prokaryotes and plays a significant role in prokaryotic evolution. This process is also known to occur between symbiotic bacteria …
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Phylogenetic Analysis Suggests Horizontal Gene Transfer Event Within the Mitis Group Within the Genus Streptococcus Involving L-Amino Oxidase In Streptococcus Oligofermentans
<p>This phylogenetic study was undertaken in order to provide further elucidation to evolutionary relationships within the genus streptococcus. The inhibition by Streptococcus oligofermentans of Streptococcus mutans is of particular interest. A comprehensive mechanism for this inhibition has been …
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Characterization of Antibiotic Resistance in <i>Vibrio cholerae</i> Isolated From Ships' Ballast and Other Environmental Sources
… novel genotypes. Of particular interest are the genes encoding for various forms of antibiotic resistance, many of which are carried on mobile genetic elements. A four-year sampling effort has yielded over 300 putative isolates of <em>Vibrio cholerae</em> from ships' ballast tanks and various …
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Indirect genetic effects of rhizobium symbiosis plasmid on legume-grass dynamics
… species. In Rhizobium symbionts of clover, the genes that determine symbiosis compatibility and efficiency are located on a plasmid (pSym, or symbiosis plasmid), which can be shared within and across taxa through horizontal gene transfer (HGT). Previous work has identified four distinct clades …
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Large scale phylogenomic estimation
… trees directly from sequences without using gene trees. Finally, SIESTA is a modification to the algorithms used by FastRFS, SVDquest, and other methods including ASTRAL that allows for the output and analysis of multiple optimal solutions, if they exist. For all these methods, I describe the …
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Understanding microbial communities through horizontal gene transfer
… the community assembly process under a serial transfer regime at a higher resolution and concluded that the diversity maintained is little affected by the complexity of the carbon source. Systematic variation of parameters in the regime demonstrated that diluting the initial inoculum has the …
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A genomic investigation into gastrointestinal antimicrobial resistance and clinical infection in patients undergoing transplantation
… these resistomes revealed patterns in paired AMR gene co-localisation, suggesting links with mobile genetic elements and potential for transmission via horizontal gene transfer (HGT). In summary, improved surveillance of HGT can bolster efforts to ensure judicious use of existing antimicrobials …
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Duplication is a prominent mechanism of recent gene birth in Caenorhabditis elegans
… their comparison has enabled the elucidation of gene birth mechanisms that act over a long evolutionary timescale. However, the lack of several reference-quality genomes for different individuals of the same species has hampered the study of the mechanisms of more evolutionarily young gene …
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Microbial adaptation, differentiation, and community structure
… temperature tolerance. Next, we investigate the genetic basis of bacterial ecological differentiation by analyzing the genomes of two closely related, yet ecologically distinct populations of Vibrio splendidus. We nd that most loci recombine freely across habitats, and that ecological …
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Factors that affect horizontal gene transfer in enteric bacteria
… environments through mutations or through horizontal gene transfer (HGT) of genetic material containing resistance genes. Conjugation machinery offers an efficient method for acquisition of AMR and virulence genes, which may be responsible for propelling the evolution of pathogenic …
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Modelling evolution of genome size in prokaryotes in response to changes in their abiotic environment
… the classic Hutchinson niche space model, a gene was defined as a Gaussian function over a corresponding niche dimension. The cell can have more than one gene along a given dimension, and the envelope of all the corresponding responses is considered a full description of a cell’s phenotype …
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Analysis and Characterization of Vitamin B Biosynthesis Pathways in the Phytoparasitic Nematode Heterodera Glycines
… A bioinformatic screen of the data revealed nine genes involved in the de novo biosynthesis and salvage of the B vitamins: B1, B5, B6, and B7. Each of these de novo pathways are believed to have been lost in most animals and their similarity to bacterial homologues made them candidates for …
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Purification and characterisation of novel recombinant β-glucosidases from aspergillus with application in biofuel production
… database from eight species. Evidence for Horizontal Gene Transfer (HGT) of bacterial origin of some β-glucosidase genes was provided by their lack of introns, absence of some fungal specific amino acid insertions in their sequences and unusual positions in phylogenetic trees showing …
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The influence of long-term nitrogen fertilization on symbiosis and metabolism in the legume-rhizobium mutualism
… particular might evolve quickly, thanks to short generation times and the potential for independent evolution of plasmids through recombination and/or horizontal gene transfer (HGT). In a previous work using the legume/rhizobia mutualism, we demonstrated that long-term nitrogen fertilization …
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Comparative genomic approaches for investigating evolution in the microbial and viral populations of the rumen
… first assessing the diversity and potential for horizontal gene transfer (HGT) of multiple strains of the cellulolytic rumen bacterium, Ruminococcus flavefaciens, and then by conducting a survey of rumen viral metagenome (virome) and subsequent comparison of the virome and microbiome sequences to …
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Biogeochemical and phylogenetic signals of Proterozoic and Phanerozoic microbial metabolisms
… develops and employs novel geochemical and genetic approaches to illuminate diagnostic signals of microbial metabolisms. Field studies, laboratory cultures, and computational models explain how methanogens produce unique nonequilibrium methane clumped isotopologue (13CH3D ) signals that do …
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THE ROLE OF SPATIAL SCALES IN BIOGEOGRAPHY AND EVOLUTION OF SOIL-BORNE STREPTOMYCES
… separation on Streptomyces community assembly, horizontal gene transfer events, and population differentiation. A combination of amplicon sequencing and comparative genome analyses show that dispersal limitation occurs at local, regional, and continental scales, and is caused by both barriers to …
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Biogeochemical and phylogenetic signals of Proterozoic and Phanerozoic microbial metabolisms
… develops and employs novel geochemical and genetic approaches to illuminate diagnostic signals of microbial metabolisms. Field studies, laboratory cultures, and computational models explain how methanogens produce unique nonequilibrium methane clumped isotopologue (1 3CH3D ) signals that do …
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Ecological insights from bacterial networks
… discovery of a massive, global network of recent gene exchange linking even distantly related bacteria from the far corners of earth. To uncover this network, I developed and validated a simple evolutionary rate heuristic and applied it to report recent transfers across nearly 5 million pairwise …
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