Dissertations / Theses on the topic 'Invasive phenotype'
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Okoro, Chinyere Kyna. "Invasive Salmonella typhimurium : linking phenotype to genotype." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607714.
Full textBloomfield, Kelly Louise, and n/a. "Investigation of the Role of Thioredoxin in the Invasive Phenotype and its Interaction with the Transcription Factor Sp1." Griffith University. School of Biomolecular and Biomedical Science, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20031021.120018.
Full textBloomfield, Kelly Louise. "Investigation of the Role of Thioredoxin in the Invasive Phenotype and its Interaction with the Transcription Factor Sp1." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/366170.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Biomolecular and Biomedical Sciences
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Thorn, Christopher Charles. "The molecular characteristics of the invasive phenotype in colorectal cancer." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493284.
Full textCasillas, Andrea Lee, Jaime M. C. Gard, and Anne E. Cress. "DNA Damage Response to Ionizing Radiation Defective in the Invasive Cancer Phenotype." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/578566.
Full textBradley, Conor Aidan. "c-MET as a key regulator of an invasive and migratory phenotype in colorectal cancer." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.695258.
Full textFrye, Catherine Anne. "Rheumatoid arthritis synovial fibroblasts: Cytokine-induced invasive phenotype and associated mechanism(s) of tissue destruction." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186719.
Full textMcGarry, Lynn C. "Mediation of transformation by the v-fos oncogene : regulation of the invasive phenotype by histone deacetylases." Thesis, Open University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403835.
Full textLongbrake, A. Christina W. "Ecology and invasive potential of Paulownia tomentosa (Scrophulariaceae) in a hardwood forest landscape." Ohio : Ohio University, 2001. http://www.ohiolink.edu/etd/view.cgi?ohiou992358342.
Full textMeistertzheim, Anne-Leila. "Capacité d'adaptation d'une espèce invasive, l'huître creuse du Pacifique Crassostrea gigas, en région Bretagne." Brest, 2008. http://www.theses.fr/2008BRES2030.
Full textThe Pacific oyster Crassostrea gigas is an important commercial species in France. The wide distribution of this species during the last decade quickly led to the developmeht of “wild” populations mainly in rocky intertidal areas. C. Gigas is now considered an invasive species in various parts of the world. The main objective of this work was to characterize the adaptative capabilities of C. Giqas in Brittany using genetic and physiological approaches at different spatial and temporal scales. Using exonic markers, significant genetic structures were observed between populations of adult oysters along the French coasts. In contrast, this difference was not observed using microsatellites. The study at the micro-scale, demonstrated no significant difference in allelic frequencies between oysters at high and low tidal heights, except at the MPI locus via allozymes analysis. At three sites f rom Brittany, significant genetic structure was observed between adult and juvenile oysters recruited in 2005 and 2006 and also between these same juveniles and cultivated spat. In the second part of this study, several physiological indicators of health and fitness-related traits were assessed on adults from the three sites described above. Strong significant differences were found between sex and gametogenesis stages throughout the year 2005. In contras no differential physiological performance was illustrated between adults at macro and micro-spatial scales. In conclusion, aIl of these results suggest a high potential of invasion for as that correspond to the compound of phenotypic plasticity and all above local selection applied to its high genetic diversity
Ahmed, Khairiya O. "Relationship between altered myoepithelial phenotype and the inflammatory cell infiltrate in progression of DCIS." Thesis, Queen Mary, University of London, 2015. http://qmro.qmul.ac.uk/xmlui/handle/123456789/7867.
Full textDrummond, Russell S. "The effect of single nucleotide polymorphisms of oxidative stress genes and low grade inflammation upon pulse wave contour analysis, a useful non invasive, intermediate vascular phenotype." Thesis, University of Glasgow, 2009. http://theses.gla.ac.uk/1332/.
Full textBalwierz, Aleksandra Karolina [Verfasser], and Stefan [Akademischer Betreuer] Wiemann. "ERBB2 as a driver of an invasive phenotype of cells grown in 3D culture and an important regulator of oncogenic miRNAs' expression in breast cancer / Aleksandra Karolina Balwierz ; Betreuer: Stefan Wiemann." Heidelberg : Universitätsbibliothek Heidelberg, 2017. http://d-nb.info/117800791X/34.
Full textKelley, Amanda. "The Effect of Temperature on Phenotypes of the Invasive European Green Crab: Physiologic Mechanisms that Facilitate Invasion Success." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1004.
Full textCrespo, Lessmann Astrid. "Identificación del fenotipo inflamatorio del asma mediante métodos no invasivos." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/394036.
Full textThis doctoral thesis is the result of the work done in the Service of Respiratory Medicine of the Hospital de la Santa Creu i Sant Pau in Barcelona and the Institute of Biomedical Research of Sant Pau (IIB Sant Pau), following the regulations of the Universitat Autònoma de Barcelona. The study of bronchial inflammation in asthma has become a valuable tool for its diagnosis, monitoring and prediction of therapeutic responses. In recent years, there has been an increased interest in methods of noninvasive evaluation of the airway inflammation. The described non-invasive methods used in the clinical practice to assess airway inflammation include the inflammatory cell counts in induced sputum and the fractional exhaled nitric oxide (FeNO). The exhaled breath temperature and the electronic nose device are considered to be new tools for measuring airway inflammation and control of asthma. The line of the developed research had as a main goal to improve the knowledge of inflammatory phenotypes of asthma through non-invasive methods. It is based on three projects. The first (1) is a clinical project that shows a high percentage of patients with dissociation between the results of the FeNO and eosinophils in induced sputum, presenting clinical and inflammatory differential characteristics. The other two projects provide an insight into the utility of two non-invasive diagnostic methods: 2) the exhaled breath temperature (EBT) and 3) the recognition of the patterns formed by organic volatile compounds using the electronic nose device. The second study does not support the usefulness of the EBT plateau, because no correlation was found between EBT and control of asthma, severity of disease, bronchial obstruction or bronchial inflammation. Furthermore, the results of the third study were encouraging since the using of an e-nose device in a regular clinical setting can reliably discriminate different inflammatory asthma phenotypes among patients with persistent asthma. Thus, the results of this thesis disclosed the applicability of various non-invasive methods performed in routine clinical practice.
Frevola, Danielle Marie Frevola. "Can Surrounding Land Use Promote Phenotypic Plasticity and Invasion Success in Wetland Plants Through Variable Nutrient Regimes?" The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531230832080876.
Full textDooley, Nora P. "The proliferative and invasive phenotypes of malignant gliomas, regulation by protein kinase C (PKC)." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0025/NQ50149.pdf.
Full textDooley, Nora P. "The proliferative & invasive phenotypes of malignant gliomas : regulation by protein kinase C (PKC)." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35694.
Full textReeve, Al J. "Phenotypic plasticity in thermal tolerance : life history strategy of an invasive freshwater fish." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/6946.
Full textLin, Yen-Chun. "Static and microfluidic live imaging studies of Plasmodium falciparum invasion phenotypes." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/271829.
Full textFigueroa, Sepúlveda Sofía Paz. "Variation of phenotypic attributes of the invasive plant eschscholzia californica across three biogeographic regions." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/153097.
Full textLas invasiones biológicas son una de las principales amenazas para la biodiversidad en todo el mundo; una forma de entender por qué algunas especies son más invasoras que otras, es analizando sus rasgos fenotípicos (o rasgos funcionales) relevantes para el desempeño, pero en un contexto biogeográfico, o sea comparar estos rasgos entre individuos provenientes de rangos nativos y los rangos invadidos. Esta comparación puede ser considerada un experimento biogeográfico y puede servir también para estudiar el potencial evolutivo de las especies enfrentadas a nuevos ambientes. Para este trabajo se compararon dos regiones invadidas (Chile y Nueva Zelanda) con su correspondiente región nativa (California) en una especie de hierba originaria de California, Eschscholzia californica. Los rasgos a comparar fueron a) Tamaño de semilla b) Fecundidad c) Presión de propágulo y las comparaciones fueron California vs Chile y California vs Nueva Zelanda, considerando dos poblaciones locales sometidas a diferentes temperaturas ambientales (10°C y 12°C). Los resultados han mostrado diferencias entre las regiones sugiriendo que las plantas producen semillas más grandes en las regiones invadidas, teniendo relación con su origen como planta ornamental lo que podría estar dándole ventajas para invadir, para la región nativa la fecundidad pareciera ser mayor y presión de propágulo no muestras diferencias, sin embargo, las diferencias locales son aparentemente más importantes. Finalmente, el análisis de componentes principales mostró más cercanía entre nueva Zelanda y California que California y Chile.
Biological invasions constitute a biodiversity threat worldwide; One way to understand why some species are more invasive than others are to analyse their phenotypic traits (or functional traits) relevant for fitness ideally between invaded range in relation to native ranges. These comparisons can be considered a biogeographical experiment which can help to elucidate the evolutionary potential of species facing to new environments. in this study, we examined two invaded regions (Chile and New Zealand) and the native range of Eschscholzia californica, a perennial grass original to California. We compared traits such as Seed size, Fecundity and Propagule pressure and the comparisons were California vs Chile and California vs New Zealand; at each region, we considered two local populations which differ in the thermal environment: (10°C and 12°C). Our results have shown differences between the regions suggesting that the plants produce bigger seeds in the invaded regions, In opposition to our expectations, at the native range fecundity was higher and for propagule pressure there were no differences. Local differences between populations, seem to be more important to take account to phenotypic variability. Finally, the principal components analysis showed more proximity between New Zealand and California than California and Chile.
Septiembre 2019
Huffman, Kerri Mills. "Investigation into the potential invasiveness of the exotic Narrow-leaved Bittercress, (Cardamine impatiens L.), Brassicaceae." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/31375.
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In our first experiment, we subjected Cardamine impatiens to non-shaded cages, 54%, or 76% shade intensity. Plants died very quickly, so LD50 data were used as a relative measure of fitness, and relative growth indices were calculated over time. Other relative measures of fitness included canopy area, leaf area, number of leaves, number of leaves per canopy area, and final plant weight. Plants in cages with no shade treatment grew faster than those in cages with shade cloth and final plant weight decreased as shade treatment percentage increased. In each population, the number of leaves increased over time and the number of leaves per canopy area decreased over time under shade treatments.
Our second experiment involved the application of 54%, 76%, and 91% shade intensity. The additional shade treatment of 91% was applied to determine the extent of plant tolerance and plasticity in response to light reduction. Due to high plant mortality in our first experiment, we treated Cardamine impatiens with a 4 week cold period prior to treatment, which simulates its biennial growth form in its natural western Virginia region habitat. Since this second experiment took place later in the year, day length was extended to more accurately duplicate the conditions during the first experiment. LD50 calculations were not necessary, and 7 of the 135 plants produced seed. Relative measures of fitness included canopy area, leaf area, number of leaves, number of leaves per canopy area, and final plant weights. As in experiment one, the number of leaves per plant increased over time, final plant weight decreased as shade treatment increased, and the number of leaves per canopy area decreased as shade treatment increased.
From these two experiments, we determined that Cardamine impatiens is a species that exhibits phenotypic plasticity and therefore may pose a threat as an invasive species. C. impatiens is able to grow and exhibit plasticity of plant architecture under the conditions of very low light. The number of leaves per canopy area decreased as shade increased, suggesting that C. impatiens is highly adaptable to low light conditions, and therefore may be exhibiting phenotypic plasticity by reallocating its resources by producing fewer leaves while maintaining canopy area. This data along with other C. impatiens traits such as high levels needed for seed production, its persistence in seed banks, along with a lack of known major enemies, indicates that they have a great capacity to invade a wide variety of habitats. We also determined that a cold treatment is necessary in order for C. impatiens to obtain optimal growth and reproduction.
Master of Science
Fetters, Tamara Lynn. "Phenotypic Responses to Invasion in the Brown Anole (Anolis sagrei)." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/96486.
Full textDoctor of Philosophy
When species invade a new area, they often face different climates that make can make survival and reproduction challenging. In response, species may alter traits in order to adjust to new temperatures and conditions. In this dissertation, I examine trait changes in a tropical lizard that has successfully invaded a cooler temperate climate, specifically examining traits that may help them to survive and reproduce in their new range. First, I examined physiological traits, as I predicted greater cold tolerance would be necessary to survival in the invasive range. I found that invasive populations tolerated lower temperatures, could sprint faster, and had higher metabolism than native populations. Next, I examined how reproductive traits may change in the invasive range in order to facilitate reproduction under shorter breeding and growing seasons. I found that compared to native females, invasive females had less time between egg lays and produced eggs that hatched more quickly. Once I assessed how traits may have changed in the new range, I determined whether changes resulted from evolution or not. I found that differences in low temperature tolerance, metabolic rate, the time between egg lays, and incubation period were the result of evolution, while sprint speed did not seem to be the result of evolution. My results provide evidence that traits can evolve rapidly during invasion, allowing invasive species to persist and spread in new areas.
Fletcher, Rebecca Ann. "An Investigation of the Factors that Facilitate and Inhibit the Range Expansion of an Invasive Plant." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/95884.
Full textDoctor of Philosophy
Invasive species threaten our natural ecosystems, our agricultural systems, and even our infrastructure, and we spend billions of dollars each year attempting to control them and reduce their negative impacts. Climate change, habitat destruction, and other forms of global change, will benefit many of these species, magnifying their impacts and promoting their invasion into new territories. Because of the damaging effects of invasive species, and the costs to control them, it is imperative that we are able to predict how they will respond to global change so that we can improve plans to reduce their impact and spread. First, we need to understand the processes that promote their invasion across large swaths of land. Just as importantly, we must study the processes that prevent their invasion of certain areas. Here, I investigated some of the processes that have facilitated, as well as hampered, the spread of the invasive plant Johnsongrass. For this work, I used Johnsongrass plants originating from different habitats, including regions where Johnsongrass is highly invasive and those where Johnsongrass is very rare. I found Johnsongrass originating from regions where it is highly invasive were able to grow very large and produce thousands of seeds that were able to germinate under a range of conditions. These traits may have contributed to the invasion success of this species. However, I found a different pattern for plants that originated from regions where Johnsongrass is rare. These plants reached reproductive age earlier and grew smaller across all environmental conditions, potentially due to the less hospitable climates of these range edges. These findings allow us to project into future climate change scenarios, because it is likely that, as temperatures warm, invasive species will be able to invade new regions, where they will impact the work of conservationists, natural resource professionals, agricultural produces, and other land managers.
Vries, Johannes Erik de. "Genotypic and phenotypic effects of c-Ha-ras oncogene transfection on human colorectal carcinoma cell lines." Maastricht : Maastricht : Universitaire Pers Maastricht ; University Library, Maastricht University [Host], 1993. http://arno.unimaas.nl/show.cgi?fid=5752.
Full textLuo, Jing. "The role of phenotypic plasticity in the invasiveness of three Taraxacum species." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1237576621.
Full textThorlacius, Magnus. "Round goby invasion of the Baltic Sea : the role of phenotypic variation." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-111910.
Full textLê-Bury, Gabrielle. "Infection des macrophages par le VIH-1 : facteurs moléculaires impliqués dans la production virale et dans le développement de bactéries opportunistes The HIV-1 protein Vpr impairs phagosome maturation by controlling microtubule-dependent trafficking Pronounced stealth phenotype and differential pyroptosis induction by invasive Salmonella Typhimurium revealed by coinfection of human macrophages with HIV Role of Solute Carriers in efficient HIV-1 production by human macrophages." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCB094.
Full textHuman Immunodeficiency Virus type 1 (HIV-1) infects macrophages. In contrast to CD4+ T cells, macrophages are resistant to the cytotoxic effects of the virus and represent a reservoir for the pathogen. In these cells, the new virions are produced and stored in a specific intracellular compartment called Virus-Containing Compartment (VCC). This non-acidic compartment, transiently connected to the plasma membrane, remains poorly characterized. In addition, HIV-1 induces an alteration of macrophage function, allowing the development of opportunistic bacteria, such as specific strains of Salmonella Typhimurium. In particular, we studied invasive non-typhoidal Salmonella Typhimurium (iNTS) strains that developed in HIV-positive patients. The aims of my thesis have been to identify the molecular factors involved in the production of HIV-1 in primary human macrophages and to study the development of the invasive strains of Salmonella Typhimurium. First, I participed in studying the effects of HIV-1 infection on macrophage function. Their main role is phagocytosis, which is a defense mechanism enabling internalization and degradation of pathogens. It has previously been shown in the host laboratory that in HIV-1 infected macrophages, the internalization step is partially inhibited by the virulence factor Nef. In this work, we have shown that the infection of these cells by HIV-1 also inhibits the maturation of phagosomes, in this case, via the viral protein Vpr. Further, we have demonstrated that HIV-1 leads to a pre-activation state of the macrophage, while preventing the cell from responding to subsequent stimuli, such as bacterial superinfection. Secondly, I studied the coinfections between HIV-1 and an invasive strain of Salmonella Typhimurium that was compared to reference strains. This work demonstrated that bacteria do not hijack the viral compartment for their survival in co-infected macrophages. Additionally, the invasive strain of Salmonella Typhimurium was observed to induce less cell death by pyroptosis than a reference strain. The signaling pathways upstream of this cell death were determined to be associated with an inflammatory mechanism. Hence, it was demonstrated that the invasive strain of Salmonella hijacks the mechanism of pyroptosis to survive in macrophages. This may explain the dissemination observed in patients. Finally, a study of new cellular factors involved in viral production in macrophages was conducted. Following a transcriptomic analysis of human primary macrophages infected, or not, with HIV-1, we identified a large number of membrane transporters called SLC (Solute Carrier) whose expression was modulated by the infection. After selecting some of the candidates for further study, I have demonstrated that some of these SLCs are important for viral production in macrophages. In conclusion, this work contributes to defining how HIV-1 infects macrophages and disturbs their activation and clearance functions, and how opportunistic pathogenic bacteria develop
Parkkali, Seija Anna. "The role of natural selection and adaptation versus phenotypic plasticity in the invasive success of Hieracium lepidulum in New Zealand." Thesis, University of Canterbury. Biological Sciences, 2008. http://hdl.handle.net/10092/1799.
Full textGenitoni, Julien. "Acclimatation de l’espèce aquatique invasive, Ludwigia grandiflora, au milieu terrestre : Approches physiologique et épigénétique." Thesis, Rennes, Agrocampus Ouest, 2019. http://www.theses.fr/2019NSARA085.
Full textAbstract: In the context of the expansion of invasive species, their survival is conditioned by their ability to adapt. In France, Ludwigia grandiflora has invaded aquatic biotopes and its recent deployment in wet meadows has led to the emergence of two morphotypes, one aquatic and the other called “terrestrial”. The aim of this thesis was to get a better understanding of water primrose acclimation capacities to terrestrial environment through exploring genetic and epigenetic sources of flexibility. The responses of two morphotypes to different water stresses were evaluated by observing physiological traits. The epigenetic pathway was addressed by the use of a hypomethylant drug. This work showed that L. grandiflora adapts its development and metabolism according to environmental conditions.The terrestrial morphotype shows higher trait values than those of the aquatic morphotype, regardless of the condition. However, phenotypic plasticity is higher in the aquatic morphotype. Finally, our results suggest the involvement of DNA methylation and phenotypic plasticity in the response of water primrose to environmental change. Since the terrestrial morphotype has higher capacities than the aquatic morphotype, its management must become a priority. The acquisition of genomic resources in L. grandiflora will make it possible to search for genetic and epigenetic markers of acclimation to the terrestrial environment
Dodson, Thomas M. "Genetic and phenotypic variation in Japanese knotweed (Fallopia japonica) in the Eastern United States." Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1247763089.
Full textAriffin, Nur Syamimi. "The mesenchymal-like phenotype of metastatic breast cancer is maintained by the transcription factor RUNX1." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/the-mesenchymallike-phenotype-of-metastatic-breast-cancer-is-maintained-by-the-transcription-factor-runx1(9b759a61-925a-4e0b-8faa-b74c2271eb18).html.
Full textKnappe, Nathalie [Verfasser], and Viktor [Akademischer Betreuer] Umansky. "Partial reprogramming of melanoma cells mimics the phenotype switch and reveals SNAI3 as a novel invasion-associated marker / Nathalie Knappe ; Betreuer: Viktor Umansky." Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://d-nb.info/1180396308/34.
Full textRice, Kelly C. "Regulation of the colonization and invasive phenotypes by protease activity in Staphylococcus aureus, analysis of fibronectin-binding protein (FNBP) and V8 protease as paradigms of this concept." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ63692.pdf.
Full textOuisse, Tiphaine. "Phenotypic and genetic characterisation of the carabid beetle Merizodus soledadinus along its invasion gradient at the subantartic Kerguelen Islands." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1B017/document.
Full textGlobal trade and human movements increase the likelihood of long-distance transportation of propagules and their subsequent introduction into new geographic regions. In some instances, newly established species can become dominant in invaded communities, at the expense of native species. Besides threatening invaded communities and ecosystem functions, biological invasions constitute natural experiments that allow to study eco-evolutionary processes in real time, including the occurrence of new biotic interactions affecting community composition, rapid adaptation to novel environmental conditions, or dispersal evolution at range margins. Because of their impoverished native communities, oceanic islands’ ecosystems are particularly sensitive to biological invasions, and the French subantarctic islands are no exception. For instance, the flightless predatory carabid beetle Merizodus soledadinus is native from the southern tip of South America, and has been accidentally introduced to the Kerguelen Islands in 1913. In the present work, we aimed at understanding the main mechanisms underlying the invasive success of this insect at the Kerguelen Islands. Using a vast array of methodologies, ecological features of M. soledadinus were investigated with analytical procedures scaling from population to molecule through the individual level. Genetic investigations support the historically-based hypothesis of a single introduction event at a unique location of the Kerguelen Islands. No genetic structure was observed among individuals sampled from different populations along the invasion gradient. We tested the hypothesis of spatial sorting of populations during range expansion, by exploring phenotypic changes among individuals sampled along the invasion gradient. The measured phenotypic traits revealed major differentiation of adults according to the residence time of their populations, confirming the occurrence of spatial sorting of populations during geographic expansion. We also demonstrated that the geographic expansion of M. soledadinus, and microhabitat selection, are primarily governed by the availability of water resources, as suggested by the high sensitivity to water stress of adults of this ground beetle. In parallel, colonisation of altitudinal habitats is governed by thermal conditions, which seem to be physiologically constraining from 200m asl onwards. As the altitudinal distribution of M. soledadinus still extends, we concluded that ongoing climatic changes play a pivotal role in this expansion. Finally, adults of this ground beetle are long-lived and active year-round. The ecological knowledge of M. soledadinus characteristics and spatial expansion dynamics suggest that the colonisation process of the Kerguelen archipelago by this species will continue. Altogether, these data could be used for parametrising range expansion models that would delineate dispersal pathways and expansion rates, in the objective to assist stakeholders’ management decisions
Cerwenka, Alexander Fabian [Verfasser], Jürgen P. [Akademischer Betreuer] Geist, Roland [Akademischer Betreuer] Gerstmeier, and Gerhard [Akademischer Betreuer] Haszprunar. "Phenotypic and genetic differentiation of invasive gobies in the upper Danube River / Alexander Fabian Cerwenka. Gutachter: Roland Gerstmeier ; Jürgen P. Geist ; Gerhard Haszprunar. Betreuer: Jürgen P. Geist." München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1065804148/34.
Full textCerwenka, Alexander Fabian Verfasser], Jürgen P. [Akademischer Betreuer] Geist, Roland [Akademischer Betreuer] Gerstmeier, and Gerhard [Akademischer Betreuer] [Haszprunar. "Phenotypic and genetic differentiation of invasive gobies in the upper Danube River / Alexander Fabian Cerwenka. Gutachter: Roland Gerstmeier ; Jürgen P. Geist ; Gerhard Haszprunar. Betreuer: Jürgen P. Geist." München : Universitätsbibliothek der TU München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20141209-1220534-0-2.
Full textChun, Young Jin. "The role of adaptive evolution of phenotypic plasticity and historical population genetic processes in purple loosestrife (Lythrum salicaria L.) invasion in North America." [Ames, Iowa : Iowa State University], 2007.
Find full textTartour, Eric. "Dosages intratumoraux d'arnm de cytokines par une technique de pcr quantitative dans les tumeurs invasives du col de l'uterus : influence de l'il-6 et de l'ifn sur le phenotype clinique de ces tumeurs." Paris 7, 1998. http://www.theses.fr/1998PA077292.
Full textLatorre, Espeso Dani. "Effects of environmental conditions on phenotypic plasticity of fishes in Iberian waters: life-history, physiological and morphological traits." Doctoral thesis, Universitat de Girona, 2019. http://hdl.handle.net/10803/672266.
Full textLa plasticitat fenotípica és la resposta adaptativa d’un genotip a presentar diferents tipus de fenotips en resposta a canvis ambientals. Aquestes respostes adaptatives poden contribuir a que una espècie determinada pugui ocupar un hàbitat o habitats determinats i d’aquesta manera, expandir la seva àrea de distribució. Aquesta tesi estudia alguns aspectes dels mecanismes d’invasió, establiment i expansió de l’espècie invasora Alburnus alburnus en diferents conques de la Península Ibèrica i aportar més informació per a una millor comprensió de la seva biologia i mecanismes d'invasió. D’altra banda, també té com objectiu comparar la morfologia, metabolisme i velocitat crítica de natació de dues poblacions de fartet, una criada en captivitat i una altra de salvatge i utilitzar aquesta informació per aplicar-la a programes de cria en captivitat i millorar la gestió de les reintroduccions d'individus criats en captivitat en el seu hàbitat natural
Programa de Doctorat en Ciència i Tecnologia de l'Aigua
AFFOUE, DIT FAUTE MURIEL. "Aspects moleculaires et cellulaires impliques dans la coexistence des phenotypes invasifs et resistants dans les cellules d'adenocarcinome mammaire mcf-7 cultivees en spheroide (doctorat : biochimie et biologie moleculaire)." Reims, 1999. http://www.theses.fr/1999REIMP211.
Full textFraimout, Antoine. "Evolution de la variation génétique et phénotypique au cours d'une invasion : le cas de Drosophila suzukii." Thesis, Paris, Muséum national d'histoire naturelle, 2016. http://www.theses.fr/2016MNHN0019.
Full textBiological invasions are a component of global change and have dramatic effects on ecosystems, agrosystems and human health. Nonetheless, these peculiar biological processes offer a great opportunity for the study of rapid phenotypic and genetic evolution, at an ecological timescale. Biological invasions often involve environmental and demographic constraints on populations, as well as strong effects of selection and drift. However, these species are among the most successful colonialists in nature, and their ability to respond to these constraints is remarkable. The evolutionary and adaptive potential of invasive populations have been proposed as facilitating factors of the success of invasions. Processes of genetic (i.e. changes in allele frequencies) and plastic (i.e. adjustment to environmental fluctuation through phenotypic plasticity) involved in the success of biological invasions are at the center of modern evolutionary biology. Here, we use the recent spread of the spotted-wing Drosophila suzukii to study the underlying mechanisms of response to selection potentially involved in the success of this global invasion. Analyzing patterns of neutral genetic variation allowed us to decipher the complex history of this worldwide invasion, and subsequently evaluate phenotypic divergence and evolution of quantitative genetic variation among ancestral and derived populations. We thus estimated the effects of selection and drift throughout this invasion and discuss their importance regarding the evolution of wing shape in this species. Finally, experimental protocols on the analysis of phenotypic plasticity as well as Species Distribution Modeling methods allowed us to discuss the influence of environmental fluctuations on the success of this invasion
Vieira, Daniela Cristine Mascia. "Ecofisiologia de Clausena excavata Burm. F. (Rutaceae), uma espécie exótica invasora /." Rio Claro : [s.n.], 2009. http://hdl.handle.net/11449/100659.
Full textBanca: Victor José Mendes Cardoso
Banca: Sergius Gandolfi
Banca: Débora Leonardo dos Santos
Banca: Dalva Maria Silva Matos
Resumo: As espécies invasoras são reconhecidas como um dos mais importantes e difíceis fatores que influenciam a conservação dos ecossistemas nativos. Na restauração de ambientes degradados, estas espécies podem afetar profundamente a trajetória do recobrimento vegetal pelas espécies nativas e, conseqüentemente, a composição do ecossistema. Um fator importante para o sucesso de algumas espécies vegetais invasoras é a plasticidade fenotípica, dandolhes grande capacidade de aclimatação em diversas condições ambientais. O conhecimento dos fatores ambientais e das características da planta que contribuem para o sucesso das espécies invasoras é de grande importância para predizer a habilidade de invasão e para esforços de manejo. Neste contexto, o objetivo principal deste estudo foi conhecer algumas características fisiológicas e ecológicas de Clausena excavata Burm. f., uma espécie de árvore exótica reconhecida como invasora em algumas regiões no mundo, no intuito de compreender o sucesso da espécie como invasora e contribuir com informações relevantes para possíveis tentativas de controle. Primeiramente, foram avaliados os efeitos da luz e da temperatura em sua germinação (condição controlada) e o efeito da luz na emergência de suas plântulas (condição natural, a pleno sol e sob a copa das árvores). As sementes germinaram tanto na presença como na ausência de luz, nas temperaturas de 20 a 35°C, sem diferença entre a porcentagem de sementes germinadas nas diferentes temperaturas. Sementes mantidas a 20°C, em ambas as condições de luz, germinaram mais lentamente em relação às demais temperaturas. Independente da temperatura, na presença de luz as sementes apresentaram uma germinação muito mais sincronizada do que aquelas mantidas no escuro. Tais resultados mostraram que as sementes de C. excavata são fotoblásticas neutra. Em campo, a emergência... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The invasive species are recognized one of more important and difficult factors that prejudice the conservation of native ecosystems. In the restoration of degraded environment, these species can to affect profoundly the trajectory of recovery by native species and, therefore, the ecosystems composition. An important factor to the success of invasive species is their phenotypic plasticity, which gives them a great ability to adjust in several environmental conditions. The knowledge of environmental factors and plant characteristics that contribute to the success of invasive species is very important to predict the invasion capacity and to manage efforts. In this context, the main objective of this study was to know some physiological and ecological characteristics of Clausena excavata Burm. f., a nonnative tree species recognized as invasive somewhere of the world, with intention to understand the success of this species as invasive and to contribute with relevant informations for a possible management. At first, were evaluated the effects of light and temperature on their seeds germination (controlled condition) and the effect of light on seedling emergence (natural condition, at full sun and shade). The seeds germinated in presence and absence of light, from 20 to 35°C, without difference among the germination percentage at different temperatures. Seeds maintained in 20°C, at both light conditions, germinated slowly than others temperatures. Independent of temperature, in light the seeds showed a germination more synchronized than the seeds kept in darkness. Those results showed that C. excavata have neuter photoblasics seeds. On the field, the emergence occurred at both environments, but at full sun all seeds produced a seedling. The seedling emergence occurred with same rate and synchronization index on two tested conditions. Thereafter, the seedlings were observed with purpose... (Complete abstract click electronic access below)
Doutor
Gard, Benjamin. "Processus écologiques et évolutifs influençant la colonisation de l'ambroisie à feuilles d'armoise (Ambrosia artemisiifolia L.) en France." Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00985748.
Full textBernardi, Maria Auxiliadora. "Expressão de CD44 e CD24 em carcinomas mamários ductais invasivos de acordo com análise dos subtipos moleculares e sua relação com fatores prognósticos." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/5/5155/tde-27102011-172419/.
Full textBackground: Breast carcinomas consist phenotypically of diverse cells and exhibit intra tumoral heterogeneity being stratified in several subgroups based in gene expression profiles or histochemical biomarkers. It was suggested that this heterogeneity is derived in part from the transformation of different subsets of cancer stem cells (CSC) in each intrinsic subgroup. The presence of CSC can be evidenced by phenotypic analysis of CD44 e CD24. This study aimed to identify the CD24 and CD44 immunophenotype within invasive ductal breast carcinoma (IDC) subtypes and determine its influence on prognosis as well as its association with the expression of Ki67, citokeratins (CK5, CK6 and CK18) and claudin-7. Methods: Immuno expression of CD44 and CD24 alone or in combination was investigated in 95 IDC cases arranged in a tissue microarray (TMA). The association with intrinsic subgroups defined as luminal A (ER+, PR+, HER2-), luminal B (ER and or PR+, HER2+), HER2 subtype (ER-, PR-, HER2+) and triple negative (ER-, PR-, HER2-), and the other markers and prognosis was analyzed. Results: CD44+CD24- and CD44-CD24+ were respectively presents in 8.4% and 16.8% of the tumors, a lack of both proteins was detected in 6.3%, while CD44+CD24+ was determined in 45.3% of the tumors. Although there was no significant correlation between subgroups and different phenotypes, the CD44+CD24- phenotype was more common in the basal subgroups but the frequency of this subtype has not been associated with clinical characteristic or biological markers. The phenotype was absent in HER2 tumors whereas luminal tumors are enriched in CD44-CD24+ and CD44+CD24+ cells which did not show associations with clinical/biological markers features. There was also no significant association of the subtypes with the event free (DFS) and overall survival (OS) but the CD44+CD24- phenotype showed a more favorable prognostic as compared to CD44-CD44+ phenotype that showed a worse prognosis (p = 0.26) (median follow up, 4.8 years) CD44+ alone was evident in 57.9%, while CD24+ was positive in 74.7% of the tumors, the latter showing a significant association with ER, PR and Ki67 and a marginal association with CK18 and claudin-7. Expression of claudin-7 and Ki67 did not associate with the cancer subgroups, while a positive association between CK18 and the luminal subgroups was found. CD44+ was not significantly associated with OS (p = 0.684) and DFS (p = 0.386) whereas CD24+ expression was also no significantly associated with OS (p = 0.32) but was associated with a decrease in DFS (p = 0.07). CK5, CK18 and Ki67 expression had no influence in OS or DFS, however claudin-7 positive although not statistically associated with OS, was associated with reduced DFS (p = 0.05). Conclusions: The heterogeneity of cells with several CD44CD24 expression may indicate the presence of different stem cell populations. Ocurrence of CD44+CD24- phenotype is more common in triple negative tumors and lower in tumors of luminal type and absent in HER2 tumors. Although not associated significantly with patho-biological markers or OS and DFS, the CD44+CD24- phenotype has a tendency to be a favorable prognostic marker in breast cancer raising the possibilty that the putative tumorigenic ability may no be restricted to cells of this phenotype. The presence of CD44-CD24+ may indicat a worse prognosis. CD24+ was associated with ER, PR, Ki67and showed a marginal association with CK18 and claudin-7. CD24 and Claudin-7 positivity were the only biological markers associated with reduced DFS. These two investigated markers can be used to improve the assessement of prognosis in breast cancer
Vieira, Daniela Cristine Mascia [UNESP]. "Ecofisiologia de Clausena excavata Burm. F. (Rutaceae), uma espécie exótica invasora." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/100659.
Full textAs espécies invasoras são reconhecidas como um dos mais importantes e difíceis fatores que influenciam a conservação dos ecossistemas nativos. Na restauração de ambientes degradados, estas espécies podem afetar profundamente a trajetória do recobrimento vegetal pelas espécies nativas e, conseqüentemente, a composição do ecossistema. Um fator importante para o sucesso de algumas espécies vegetais invasoras é a plasticidade fenotípica, dandolhes grande capacidade de aclimatação em diversas condições ambientais. O conhecimento dos fatores ambientais e das características da planta que contribuem para o sucesso das espécies invasoras é de grande importância para predizer a habilidade de invasão e para esforços de manejo. Neste contexto, o objetivo principal deste estudo foi conhecer algumas características fisiológicas e ecológicas de Clausena excavata Burm. f., uma espécie de árvore exótica reconhecida como invasora em algumas regiões no mundo, no intuito de compreender o sucesso da espécie como invasora e contribuir com informações relevantes para possíveis tentativas de controle. Primeiramente, foram avaliados os efeitos da luz e da temperatura em sua germinação (condição controlada) e o efeito da luz na emergência de suas plântulas (condição natural, a pleno sol e sob a copa das árvores). As sementes germinaram tanto na presença como na ausência de luz, nas temperaturas de 20 a 35°C, sem diferença entre a porcentagem de sementes germinadas nas diferentes temperaturas. Sementes mantidas a 20°C, em ambas as condições de luz, germinaram mais lentamente em relação às demais temperaturas. Independente da temperatura, na presença de luz as sementes apresentaram uma germinação muito mais sincronizada do que aquelas mantidas no escuro. Tais resultados mostraram que as sementes de C. excavata são fotoblásticas neutra. Em campo, a emergência...
The invasive species are recognized one of more important and difficult factors that prejudice the conservation of native ecosystems. In the restoration of degraded environment, these species can to affect profoundly the trajectory of recovery by native species and, therefore, the ecosystems composition. An important factor to the success of invasive species is their phenotypic plasticity, which gives them a great ability to adjust in several environmental conditions. The knowledge of environmental factors and plant characteristics that contribute to the success of invasive species is very important to predict the invasion capacity and to manage efforts. In this context, the main objective of this study was to know some physiological and ecological characteristics of Clausena excavata Burm. f., a nonnative tree species recognized as invasive somewhere of the world, with intention to understand the success of this species as invasive and to contribute with relevant informations for a possible management. At first, were evaluated the effects of light and temperature on their seeds germination (controlled condition) and the effect of light on seedling emergence (natural condition, at full sun and shade). The seeds germinated in presence and absence of light, from 20 to 35°C, without difference among the germination percentage at different temperatures. Seeds maintained in 20°C, at both light conditions, germinated slowly than others temperatures. Independent of temperature, in light the seeds showed a germination more synchronized than the seeds kept in darkness. Those results showed that C. excavata have neuter photoblasics seeds. On the field, the emergence occurred at both environments, but at full sun all seeds produced a seedling. The seedling emergence occurred with same rate and synchronization index on two tested conditions. Thereafter, the seedlings were observed with purpose... (Complete abstract click electronic access below)
Hall, Charles. "Ex vivo reprogramming of tumor-reactive immune cells from FVBN202 mice bearing lung metastatic mammary carcinoma: an immunotherapeutic opportunity revealed against recurrence." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/3176.
Full textGiannini, Giuseppe. "A tumoral and invasive phenotype independent of c-Met mutation." Thèse, 2003. http://hdl.handle.net/1866/14926.
Full textLin, Ai-Chien, and 林愛潔. "Type 1 insulin-like growth factor receptor signaling and the invasive phenotype of cervical cancer cells." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/04980526990440783500.
Full text國立成功大學
藥理學研究所
92
This study is aimed to identify the specific growth factors which are critically involved in cervical cancer cell invasion and proliferation, and test the hypothesis that adhesion receptors of integrin family and growth factor receptor signaling may cooperate functionally to promote cancer invasion and proliferation. The results demonstrate that insulin like growth factor-1 (IGF-1) is a potent stimulator of cervical cancer cell invasion and proliferation. The IGF-1-stimulating effects are completely inhibited by antagonistic antibody against IGF-1 receptor (IGF-1R), whereas the effects was unaffected by either IgG or blocking antibody to insulin receptor (IR). Blocking ligand occupancy of alphav beta3, but not alpha2, alpha3, alpha4, alpha6, beta1, beta4 or alpha2 beta1 integrin, result in attenuation of cervical cancer cell response to IGF-1 stimulation. The immunofluorescent stains of surgical specimens show that cervical cancer cell with a strong tendency to invade or metastasize have higher expression of IGF-1/IGF-1R than those with a low ability to do so. Furthermore, IGF-1R overexpression correlates with poor clinical outcome in early stage of cervical cancer. Blockade of alphav beta3 integrin and IGF-1R signalings may provide novel strategies for the treatment of invasive phenotypes of cervical cancer. The mechanisms by which insulin-like growth factor 1 (IGF-1) cooperates with membrane ion transport system to modulate epithelial cell motility and proliferation remain poorly understood. Here, we investigated the role of electroneutral K-Clcotransport (KCC), in IGF-1-dependent invasiveness and proliferation of cervical cancer cells. IGF-1 increased KCC activity and mRNA expression in a dose-and time-dependent manner in parallel with the enhancement of regulatory volume decrease. IGF-1 treatment triggers phosphatidylinositol 3-kinase (PI3K) and mitogen-activated protein kinase (MAPK) cascades leading to the activation of Akt and extracellular signal-regulated kinase1/2 (Erk1/2), respectively. The activated Erk1/2MAPK and PI3K signaling pathways are differentially required for IGF-1-stimulated biosynthesis of KCC polypeptides. IGF-1 stimulated cellular invasiveness and proliferation are abolished by the KCC inhibitor, 50 mM DIOA. It demonstrates that KCC is necessary for IGF-1-induced cancer cell invasiveness and proliferation. IGF-1 and KCC colocalize in the surgical specimens of cervical cancer (n=28), suggesting autocrine or paracrine IGF-1 stimulation of KCC production. Taken together, our results indicate that KCC activation by IGF-1 plays an important role in IGF-1 signaling to promote growth and invasion of cervical cancer cells.
Teodoro, Inês Maria Marques. "Pneumococcal invasive disease in adults (2015-2017): epidemiological and molecular characterization of Streptococcus pneumoniae and genomic analysis of emerging clones." Master's thesis, 2020. http://hdl.handle.net/10451/51878.
Full textThe introduction of the 13-valent pneumococcal conjugate vaccine (PCV13) for children in Portugal resulted in significant changes in the serotype distribution of the pneumococcal population responsible for invasive pneumococcal disease (IPD) not only in children, but also in adults, consistent with herd protection. A 23-valent pneumococcal polysaccharide vaccine (PPV23) is also available in Portugal since 1996, although adult uptake is believed to be low. The effect of broader PCV13 uptake in children in adult IPD is currently unknown. We aimed to characterize the pneumococcal population causing adult IPD (≥18 years old) in Portugal after the introduction of PCV13 in the Nacional Immunization Plan for children, in 2015. A total of 1608 Streptococcus pneumoniae isolates were recovered from adult IPD in 61 hospitals in Portugal between 2015 and 2017. These strains were characterized phenotypically (serotyping and antimicrobial susceptibility testing) and by molecular methods (MLST). The results obtained were compared with those from previous studies to assess the effect of PCV13 introduction in Nacional Immunization Plan in the studied population. Among the 1608 isolates, 56 different serotypes were found. The most common serotypes were serotype 8 (17.8%, n=287), 3 (14.7%, n=236), 22F (7.4%, n=119), 14 (6.9%, n=111), 19A (6.2%, n=100) and 9N (4.1%, n=66). Most of the cases corresponded to serotypes exclusively found in the PPV23 (42.4%, n=681). The PCV13 serotypes were responsible for 37.6% (n=605) of the cases, and 7-valent pneumococcal conjugate vaccine (PCV7) serotypes accounted for a small fraction of the cases (14.0%, n=225). Penicillin and erythromycin non-susceptibility were detected in 14.9% (n=239) and 16.4% (n=263) of the bacterial isolates, respectively. PCV7 and serotypes exclusively found in PCV13 were responsible for 51.0% (n=122) and 15.5% (n=37) of the penicillin non-susceptible isolates and 37.6% (n=99) and 19.0% (n=50) of the erythromycin resistant isolates, respectively. Regarding all collection, 31.2% (n=501) of the strains were non-susceptible to at least one of the tested antibiotics, where serotypes 14 and 19A were the most common. MLST analysis was performed in 726 strains, where 56 different clonal complexes were found. PCV13 serotypes presented a high genetic diversity, while serotypes exclusively found in PPV23 and non-vaccine serotypes (NVT) presented a lower genetic diversity. Thirteen major clonal complexes (CC) were defined in this study that accounted for 86.4% (n=627) of the isolates: CC156, CC180, CC433, CC378, CC97, CC235, CC439, CC199, CC260, CC315, CC994, CC30 and CC191. Eleven of the 43 PMEN clones were at least double-locus-variant of 33.6% (n=244) of the isolates, however no significant association was established between clonal complexes and penicillin and erythromycin non-susceptible isolates. Serotyping was also performed using in silico methods, where both approaches (SeroBa and PneumoCAT) were found to be good alternatives to conventional methods for the determination of S. pneumoniae serotypes. Comparison with previous studies revealed an increase in the proportion of serotypes 8 and 12F, while serotypes 1, 12B and 7F decreased. Non-susceptible serotypes 8 and 22F isolates increased, whereas non-susceptible 19A isolates decreased. Although not significant, serotype 3 also presented an increase in the proportion of non-susceptible isolates to some of the antimicrobials tested. Regarding genetic lineages, sequence type (ST) 53 (serotype 8) increased, while ST191 (serotype 7F) and ST276 (serotype 19A) decreased. Even with the introduction of PCV13 in the National Immunization Plan, serotype 3 is still one of the dominant serotypes in adult IPD in Portugal, along with serotypes 14 and 19A (all serotypes present in PCV13). The increase in serotypes that do not belong to PCV13, especially serotype 8, 22F and 9N is also of concern, particularly serotypes 8 and 22F where antimicrobial non-susceptible isolates increased. With these, our data suggests that, in a situation of higher vaccination coverage, PCV13 serotypes are still significant causes of adult IPD, especially serotypes 3. However, serotypes not present in PCV13 have been showing to be an important cause of adult IPD, particularly serotypes 8 and 22F, reinforcing the continuous need for surveillance studies.
Streptococcus pneumoniae é um dos agentes patogénicos mais comuns do ser humano, responsável por elevadas taxas de mortalidade e morbilidade. Este microrganismo coloniza, tipicamente, a nasofaringe das crianças, podendo tornar-se patogénico, levando ao desenvolvimento de doenças pneumocócicas invasivas como a pneumonia, meningite e bacteriemia, ou não invasivas como otite média ou sinusite. Tem como principais grupos de risco crianças, indivíduos imunocomprometidos e idosos. Com a introdução das vacinas pneumocócicas conjugadas, observou-se um decréscimo na incidência da doença pneumocócica invasiva em crianças, assim como alterações na distribuição dos serotipos, também na população adulta. Este decréscimo deveu-se sobretudo à redução da incidência dos serotipos incluídos nestas vacinas. Contudo, observou-se um aumento na proporção de serotipos não vacinais, assim como a persistência de alguns serotipos vacinais (como foi o caso do serotipo 3 que se encontra presente na vacina pneumocócica conjugada 13-valente). A vacina pneumocócica conjugada 7-valente (PCV7, inclui os serotipos 4, 6B, 9V, 14, 18C, 19F e 23F) foi introduzida em Portugal em 2001. Apesar de disponível apenas no sector privado, a cobertura desta vacina foi aumentado gradualmente ao longo dos anos, tendo-se estimado uma cobertura vacinal de 75% das crianças com ≤2 anos em 2008. Tal como nas crianças, nos adultos observou-se uma redução da proporção de doença pneumocócica invasiva causada por serotipos abrangidos pela vacina PCV7. No entanto, os serotipos 1, 3, 7F e 19A emergiram como causas importantes de doença pneumocócica invasiva nos adultos pós-PCV7 (estudo de 2006 a 2008). Em meados de 2009, a vacina pneumocócica conjugada 10-valente (PCV10, engloba todos os serotipos presentes na vacina PCV7, mais os serotipos 1, 5 e 7F) ficou disponível, seguindo-se em 2010 a disponibilização da vacina pneumocócica conjugada 13-valente (PCV13, abrange todos os serotipos presentes na vacina PCV10, mais os serotipos 3, 6A e 19A), ambas no sector privado. A introdução desta última vacina em Portugal resultou numa alteração da distribuição dos serotipos da população de S. pneumoniae responsáveis por doença pneumocócica invasiva em adultos, apesar de estes permanecerem como importantes causas de doença pneumocócica invasiva nos adultos, consistente com o efeito de proteção de grupo. A vacina pneumocócica polissacarídica 23-valente (PPV23, integra todos os serotipos presentes na vacina PCV13, à exceção do serotipo 6A, mais os serotipos 2, 8, 9N, 10A, 11A, 12F, 15B, 17F, 20, 22F e 33F) encontra-se disponível em Portugal desde 1996, ainda assim estima-se que a cobertura desta vacina seja baixa. Em 2015, a vacina PCV13 foi introduzida no plano nacional de vacinação das crianças, esperando-se, deste modo, uma maior cobertura vacinal, o que pode levar a alterações na população deste microrganismo causador de doença pneumocócica invasiva em criança e, consequentemente, em adultos. Assim, este estudo teve como objetivo caracterizar a população de Streptococcus pneumoniae causadora de doença invasiva pneumocócica nos adultos (indivíduos com ≥18 anos) em Portugal, após a introdução da vacina PCV13 no plano nacional de vacinação para as crianças em 2015. Um total de 1608 estirpes de Streptococcus pneumoniae responsável por doença invasiva pneumocócica em adultos foram recebidas por 61 hospitais de todo o país entre 2015 e 2017. Estas estripes foram caracterizadas fenotipicamente (através de serotipagem e teste de suscetibilidade aos antimicrobianos) e genotipicamente (através de métodos moleculares, obtendo-se o perfil de multilocus sequence typing por sequenciação total do genoma). Os resultados obtidos foram ainda comparados com os de estudos anteriores, de forma a avaliar o efeito da introdução da vacina PCV13 no plano nacional de vacinação na população em estudo. De entre as 1608 estirpes de pneumococos, foram encontrados 56 serotipos diferentes, sendo que os mais frequentes foram os serotipos: 8 (17.8%, n=287), 3 (14,7%, n=236), 22F (7,4%, n=119), 14 (6,9%, n=111), 19A (6,2%, n=100) e 9N (4,1%, n=66). Grande parte dos casos pertenceram a serotipos exclusivos da vacina PPV23 (42,4%, n=681). Os serotipos da vacina PCV13 foram responsáveis por 37,6% (n=605) dos casos em estudo, sendo que serotipos da vacina PCV7 foram responsáveis por uma pequena fração dos casos em estudo (14,0%, n=225). A não suscetibilidade à penicilina e à eritromicina foi detetada em 14,9% (n=239) e 16,4% (n=263) das estirpes estudadas, respetivamente. Serotipos da vacina PCV7 e serotipos exclusivos da vacina PCV13 foram responsáveis por 51,0% (n=122) e 15,5% (n=37) dos casos de não suscetibilidade à penicilina e 37,6% (n=99) e 19,0% (n=50) dos casos de resistência à eritromicina, respetivamente. Em relação à coleção total de estirpes, 31,2% (n=501) das estirpes apresentaram não suscetibilidade a pelos menos um dos antimicrobianos testados, onde os serotipos 14 e 19 foram os mais comuns. A analise dos perfis de multilocus sequence typing foi realizada em 50% das estipes que apresentaram mais do que 10 estirpes do mesmo serotipo, tendo-se obtido um total de 726 estirpes sequenciadas, onde foram detetados 56 complexos clonais diferentes. Serotipos da vacina PCV13 apresentaram uma elevada diversidade genética, enquanto que os serotipos exclusivos da vacina PPV23 e serotipos não vacinais apresentaram uma diversidade genética baixa. Treze complexos clonais principais foram definidos neste estudo, englobando 86,4% (n=627) das estirpes sequenciadas: complexo clonal (CC) 156, CC180, CC433, CC378, CC97, CC235, CC439, CC199, CC260, CC315, CC994, CC30 e CC191. Onze dos 43 clones PMEN foram identificados como sendo, pelo menos, double-locus-variants de 33,6% (n=244) das estirpes sequenciadas. No entanto, não se estabeleceu nenhuma associação significativa, depois da correção para testes múltiplos, entre complexos clonais e não suscetibilidade à penicilina e à eritromicina. Determinaram-se, ainda, os serotipos através de métodos in silico, onde se observou que ambos os softwares SeroBa e PneumoCAT são boas alternativas aos métodos convencionais para a determinação dos serotipos de S. pneumoniae. Em relação à analise comparativa com estudos anteriores, observou-se um aumento na proporção dos serotipos 8 e 12F, ao passo que os serotipo 1, 12B e 7F apresentaram um decréscimo significativo. A proporção de serotipos 8 e 22F não suscetíveis a antimicrobianos aumentou quando comparada com a proporção do estudo anterior, enquanto que a proporção de serotipo 19A não suscetível a antimicrobianos diminuiu significativamente. Apesar de não significativo após a correção para testes múltiplos, o serotipo 3 também apresentou um aumento na sua proporção de estirpes não suscetíveis a determinados antimicrobianos testados. Em relação à analise comparativa das linhagens genéticas, sequence type (ST) 53 (constituído maioritariamente por estirpes do serotipo 8) aumentou em proporção, ao passo que os ST191 (constituído sobretudo por estirpes do serotipo 7F) e ST276 (constituído principalmente por estirpes do serotipo 19A) diminuíram, todos de modo significativo. Deste modo, observou-se que mesmo com a introdução da vacina PCV13 no plano nacional de vacinação, o serotipo 3 continua a ser um dos serotipos mais frequente como causa de doença invasiva pneumocócica em adultos em Portugal, juntamente com os serotipos 14 e 19A (todos estes serotipos estão presentes na vacina PCV13). O aumento da proporção de serotipos não abrangidos pela vacina PCV13, nomeadamente os serotipos 8, 22F e 9N, são de especial preocupação, principalmente o caso dos serotipos 8 e 22F onde se observou um aumento na proporção de estirpes não suscetíveis a antimicrobianos. Assim, podemos concluir com este estudo que numa situação de elevada cobertura vacinal, os serotipos da vacina PCV13 ainda são causas importantes de doença pneumocócica invasiva nos adultos, em particular o serotipo 3. Contudo, os serotipos não abrangidos por esta vacina têm-se mostrado, também, relevantes causas de doença pneumocócica invasiva em adultos em Portugal, especialmente os serotipos 8 e 22F, reforçando desta forma a continua necessidade de realizar estudos de vigilância epidemiológica.