keyword
MENU ▼
Read by QxMD icon Read
search

Human asexuality

keyword
https://www.readbyqxmd.com/read/28899381/ned-19-inhibition-of-parasite-growth-and-multiplication-suggests-a-role-for-naadp-mediated-signalling-in-the-asexual-development-of-plasmodium-falciparum
#1
Pablo Suárez-Cortés, Guido Gambara, Annarita Favia, Fioretta Palombi, Pietro Alano, Antonio Filippini
BACKGROUND: Although malaria is a preventable and curable human disease, millions of people risk to be infected by the Plasmodium parasites and to develop this illness. Therefore, there is an urgent need to identify new anti-malarial drugs. Ca(2+) signalling regulates different processes in the life cycle of Plasmodium falciparum, representing a suitable target for the development of new drugs. RESULTS: This study investigated for the first time the effect of a highly specific inhibitor of nicotinic acid adenine dinucleotide phosphate (NAADP)-induced Ca(2+) release (Ned-19) on P...
September 12, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28886443/antiplasmodial-activities-of-dyes-against-plasmodium-falciparum-asexual-and-sexual-stages-contrasted-uptakes-of-triarylmethanes-brilliant-green-green-s-e142-and-patent-blue-v-e131-by-erythrocytes
#2
Louis-Jérôme Leba, Jean Popovici, Yannick Estevez, Stéphane Pelleau, Eric Legrand, Lise Musset, Christophe Duplais
The search for safe antimalarial compounds acting against asexual symptom-responsible stages and sexual transmission-responsible forms of Plasmodium species is one of the major challenges in malaria elimination programs. So far, among current drugs approved for human use, only primaquine has transmission-blocking activity. The discovery of small molecules targeting different Plasmodium falciparum life stages remains a priority in antimalarial drug research. In this context, several independent studies have recently reported antiplasmodial and transmission-blocking activities of commonly used stains, dyes and fluorescent probes against P...
August 2, 2017: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/28877692/the-use-of-a-p-falciparum-specific-coiled-coil-domain-to-construct-a-self-assembling-protein-nanoparticle-vaccine-to-prevent-malaria
#3
Christopher P Karch, Tais A P F Doll, Sara M Paulillo, Issa Nebie, David E Lanar, Giampietro Corradin, Peter Burkhard
BACKGROUND: The parasitic disease malaria remains a major global public health concern and no truly effective vaccine exists. One approach to the development of a malaria vaccine is to target the asexual blood stage that results in clinical symptoms. Most attempts have failed. New antigens such as P27A and P27 have emerged as potential new vaccine candidates. Multiple studies have demonstrated that antigens are more immunogenic and are better correlated with protection when presented on particulate delivery systems...
September 6, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/28870457/a-fluorogenic-c-neoformans-reporter-strain-with-a-robust-expression-of-m-cherry-expressed-from-a-safe-haven-site-in-the-genome
#4
Rajendra Upadhya, Woei C Lam, Brian T Maybruck, Maureen J Donlin, Andrew L Chang, Sarah Kayode, Kate L Ormerod, James A Fraser, Tamara L Doering, Jennifer K Lodge
C. neoformans is an encapsulated fungal pathogen with defined asexual and sexual life cycles. Due to the availability of genetic and molecular tools for its manipulation, it has become a model organism for studies of fungal pathogens, even though it lacks a reliable system for maintaining DNA fragments as extrachromosomal plasmids. To compensate for this deficiency, we identified a genomic gene-free intergenic region where heterologous DNA could be inserted by homologous recombination without adverse effects on the phenotype of the recipient strain...
September 12, 2017: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/28859429/gametocytemia-and-attractiveness-of-plasmodium-falciparum-infected-kenyan-children-to-anopheles-gambiae-mosquitoes
#5
Annette O Busula, Teun Bousema, Collins K Mweresa, Daniel Masiga, James G Logan, Robert W Sauerwein, Niels O Verhulst, Willem Takken, Jetske G de Boer
It has been suggested that Plasmodia manipulate their vertebrate hosts to enhance parasite transmission. Using a dual-choice olfactometer, we investigated the attraction of Anopheles gambiae to 50 Kenyan children (aged 5-12 years) who were naturally infected with Plasmodium falciparum or noninfected controls. Microscopic gametocyte carriers attracted almost 2 times more mosquitoes than children who were parasite free, harbored asexual stages, or had gametocytes at submicroscopic densities. By using highly sensitive stage-specific molecular methods to detect P...
August 1, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28840304/myba-a-new-player-driving-survival-of-the-conidium-of-the-human-pathogen-aspergillus-fumigatus
#6
REVIEW
Özlem Sarikaya Bayram, Jean Paul Latgé, Özgür Bayram
Aspergillus fumigatus is an opportunistic human pathogen that causes various complications in patients with a weakened immune system functions. Asexual spores of A. fumigatus are responsible for initiation of aspergillosis. Long-term viability and proper germination of dormant conidia depend on trehalose accumulation, which protect the spores against thermal and oxidative stress. A putative Myb transcription factor, MybA has been recently found to be responsible for a variety of physiological and molecular roles ranging from conidiation, spore viability, trehalose accumulation, cell wall integrity and protection against reactive oxygen species...
August 24, 2017: Current Genetics
https://www.readbyqxmd.com/read/28839251/odours-of-plasmodium-falciparum-infected-participants-influence-mosquito-host-interactions
#7
Jetske G de Boer, Ailie Robinson, Stephen J Powers, Saskia L G E Burgers, John C Caulfield, Michael A Birkett, Renate C Smallegange, Perry J J van Genderen, Teun Bousema, Robert W Sauerwein, John A Pickett, Willem Takken, James G Logan
Malaria parasites are thought to influence mosquito attraction to human hosts, a phenomenon that may enhance parasite transmission. This is likely mediated by alterations in host odour because of its importance in mosquito host-searching behaviour. Here, we report that the human skin odour profile is affected by malaria infection. We compared the chemical composition and attractiveness to Anopheles coluzzii mosquitoes of skin odours from participants that were infected by Controlled Human Malaria Infection with Plasmodium falciparum...
August 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28830940/the-toxoplasma-centrocone-houses-cell-cycle-regulatory-factors
#8
Anatoli Naumov, Stella Kratzer, Li-Min Ting, Kami Kim, Elena S Suvorova, Michael W White
Our knowledge of cell cycle regulatory mechanisms in apicomplexan parasites is very limited. In this study, we describe a novel Toxoplasma gondii factor that has a vital role in chromosome replication and the regulation of cytoplasmic and nuclear mitotic structures, and we named this factor ECR1 for essential for chromosome replication 1. ECR1 was discovered by complementation of a temperature-sensitive (ts) mutant that suffers lethal, uncontrolled chromosome replication at 40°C similar to a ts mutant carrying a defect in topoisomerase...
August 22, 2017: MBio
https://www.readbyqxmd.com/read/28812327/design-and-synthesis-of-terephthalic-acid-based-histone-deacetylase-inhibitors-with-dual-stage-anti-plasmodium-activity
#9
Katharina Stenzel, Ming Jang Chua, Sandra Duffy, Yevgeniya Antonova-Koch, Stephan Meister, Alexandra Hamacher, Matthias U Kassack, Elizabeth Winzeler, Vicky M Avery, Thomas Kurz, Katherine T Andrews, Finn K Hansen
In this work we aimed to develop parasite-selective histone deacetylase inhibitors (HDAC) inhibitors with activity against the disease-causing asexual blood stages of Plasmodium as well as causal prophylactic and/or transmission blocking properties. We report the design, synthesis, and biological testing of a series of 13 terephthalic acid-based HDAC inhibitors. All compounds showed low cytotoxicity against human embryonic kidney (HEK293) cells (IC50 : 8->51 μm), with 11 also having sub-micromolar in vitro activity against drug-sensitive (3D7) and multidrug-resistant (Dd2) asexual blood-stage P...
August 15, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28800735/life-span-of-in-vitro-differentiated-plasmodium-falciparum-gametocytes
#10
Tamirat Gebru, Albert Lalremruata, Peter G Kremsner, Benjamin Mordmüller, Jana Held
BACKGROUND: The sexual stages (gametocytes) of Plasmodium falciparum do not directly contribute to the pathology of malaria but are essential for transmission of the parasite from the human host to the mosquito. Mature gametocytes circulate in infected human blood for several days and their circulation time has been modelled mathematically from data of previous in vivo studies. This is the first time that longevity of gametocytes is studied experimentally in vitro. METHODS: The in vitro longevity of P...
August 11, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28768894/phenotypic-plasticity-in-reproductive-effort-malaria-parasites-respond-to-resource-availability
#11
Philip L G Birget, Charlotte Repton, Aidan J O'Donnell, Petra Schneider, Sarah E Reece
The trade-off between survival and reproduction is fundamental in the life history of all sexually reproducing organisms. This includes malaria parasites, which rely on asexually replicating stages for within-host survival and on sexually reproducing stages (gametocytes) for between-host transmission. The proportion of asexual stages that form gametocytes (reproductive effort) varies during infections-i.e. is phenotypically plastic-in response to changes in a number of within-host factors, including anaemia...
August 16, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28768890/is-meiosis-a-fundamental-cause-of-inviability-among-sexual-and-asexual-plants-and-animals
#12
Daniel A Levitis, Kolea Zimmerman, Anne Pringle
Differences in viability between asexually and sexually generated offspring strongly influence the selective advantage and therefore the prevalence of sexual reproduction (sex). However, no general principle predicts when sexual offspring will be more viable than asexual offspring. We hypothesize that when any kind of reproduction is based on a more complex cellular process, it will encompass more potential failure points, and therefore lower offspring viability. Asexual reproduction (asex) can be simpler than sex, when offspring are generated using only mitosis...
August 16, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28743888/multiplication-rate-variation-in-the-human-malaria-parasite-plasmodium-falciparum
#13
Lee Murray, Lindsay B Stewart, Sarah J Tarr, Ambroise D Ahouidi, Mahamadou Diakite, Alfred Amambua-Ngwa, David J Conway
It is important to understand intrinsic variation in asexual blood stage multiplication rates of the most virulent human malaria parasite, Plasmodium falciparum. Here, multiplication rates of long-term laboratory adapted parasite clones and new clinical isolates were measured, using a newly standardised assay of growth from low starting density in replicate parallel cultures with erythrocytes from multiple different donors, across multiple cycles. Multiplication rates of long-term established clones were between 7...
July 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28738214/plasmodium-falciparum-in%C3%A2-vitro-continuous-culture-conditions-a-comparison-of-parasite-susceptibility-and-tolerance-to-anti-malarial-drugs-throughout-the-asexual-intra-erythrocytic-life-cycle
#14
Sandra Duffy, Vicky M Avery
The continuous culture of Plasmodium falciparum is often seen as a means to an end, that end being to probe the biology of the parasite in question, and ultimately for many in the malaria drug discovery arena, to identify means of killing the parasite in order to treat malaria. In vitro continuous culture of Plasmodium falciparum is a fundamental requirement when undertaking malaria research where the primary objectives utilise viable parasites of a desired lifecycle stage. This investigation, and resulting data, compared the impact culturing Plasmodium falciparum long term (4 months) in different environmental conditions had on experimental outcomes and thus conclusions...
July 15, 2017: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/28701714/structural-and-biochemical-characterization-of-apicomplexan-inorganic-pyrophosphatases
#15
Abhishek Jamwal, Manickam Yogavel, Malik Z Abdin, Swatantra K Jain, Amit Sharma
Inorganic pyrophosphatases (PPase) participate in energy cycling and they are essential for growth and survival of organisms. Here we report extensive structural and functional characterization of soluble PPases from the human parasites Plasmodium falciparum (PfPPase) and Toxoplasma gondii (TgPPase). Our results show that PfPPase is a cytosolic enzyme whose gene expression is upregulated during parasite asexual stages. Cambialistic PfPPase actively hydrolyzes linear short chain polyphosphates like PPi, polyP3 and ATP in the presence of Zn(2+)...
July 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28699823/the-gmz2-malaria-vaccine-from-concept-to-efficacy-in-humans
#16
Michael Theisen, Bright Adu, Benjamin Mordmüller, Subhash Singh
GMZ2 is a recombinant protein consisting of conserved domains of GLURP and MSP3, two asexual blood-stage antigens of Plasmodium falciparum, and is designed with the aim of mimicking naturally acquired anti-malarial immunity. The rationale for combining these two antigens is based on a series of immune epidemiological studies from geographically diverse malaria endemic regions; functional in vitro studies; and pre-clinical studies in rodents and New World monkeys. GMZ2 adjuvanted with alhydrogel® (alum) was well tolerated and immunogenic in three phase 1 studies...
September 2017: Expert Review of Vaccines
https://www.readbyqxmd.com/read/28688334/-behind-closed-doors-with-open-minds-a-qualitative-study-exploring-nursing-home-staff-s-narratives-towards-their-roles-and-duties-within-the-context-of-sexuality-in-dementia
#17
T Vandrevala, T Chrysanthaki, E Ogundipe
BACKGROUND: Despite sexual expression being recognised as a fundamental human need, sexuality in old age is often ignored and frequently misunderstood, with residents with dementia in a nursing home often viewed as asexual or incapable of being sexually active. OBJECTIVES: The current study aims to understand the views held by nursing care home staff towards dementia and sexuality and explore the roles they may adopt whilst responding and managing sexual needs and expression for residents with dementia...
June 13, 2017: International Journal of Nursing Studies
https://www.readbyqxmd.com/read/28677124/myba-a-transcription-factor-involved-in-conidiation-and-conidial-viability-of-the-human-pathogen-aspergillus-fumigatus
#18
Isabel Valsecchi, Özlem Sarikaya-Bayram, Joanne Wong Sak Hoi, Laetitia Muszkieta, John Gibbons, Marie-Christine Prevost, Adeline Mallet, Jacomina Krijnse-Locker, Oumaima Ibrahim-Granet, Isabelle Mouyna, Paul Carr, Michael Bromley, Vishukumar Aimanianda, Jae-Hyuk Yu, Antonis Rokas, Gerhard H Braus, Cosmin Saveanu, Özgür Bayram, Jean Paul Latgé
Aspergillus fumigatus, a ubiquitous human fungal pathogen, produces asexual spores (conidia), which are the main mode of propagation, survival and infection of this human pathogen. In this study, we present the molecular characterization of a novel regulator of conidiogenesis and conidial survival called MybA because the predicted protein contains a Myb DNA binding motif. Cellular localization of the MybA::Gfp fusion and immunoprecipitation of the MybA::Gfp or MybA::3xHa protein showed that MybA is localized to the nucleus...
July 5, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28671944/predominance-of-asymptomatic-and-sub-microscopic-infections-characterizes-the-plasmodium-gametocyte-reservoir-in-the-peruvian-amazon
#19
Eduard Rovira-Vallbona, Juan José Contreras-Mancilla, Roberson Ramirez, Mitchel Guzmán-Guzmán, Gabriel Carrasco-Escobar, Alejandro Llanos-Cuentas, Joseph M Vinetz, Dionicia Gamboa, Anna Rosanas-Urgell
Malaria transmission requires that Anopheles mosquitoes ingest Plasmodium gametocyte stages circulating in the human bloodstream. In the context of malaria elimination, understanding the epidemiology of gametocytes relative to all Plasmodium infections and the contribution of asymptomatic and sub-microscopic parasite carriers to the gametocyte reservoir is necessary, especially in low endemic settings with predominance of P.vivax. A 13-month longitudinal study was conducted in two communities (n = 1935 individuals) of Loreto Department, Peru, with five active screenings for Plasmodium infections and gametocyte stages by quantitative real-time PCR (qPCR) and reverse transcription (RT)-qPCR, respectively...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28597816/sex-and-the-imperfect-fungi
#20
Paul S Dyer, Ulrich Kück
Approximately 20% of species in the fungal kingdom are only known to reproduce by asexual means despite the many supposed advantages of sexual reproduction. However, in recent years, sexual cycles have been induced in a series of emblematic "asexual" species. We describe how these discoveries were made, building on observations of evidence for sexual potential or "cryptic sexuality" from population genetic analyses; the presence, distribution, and functionality of mating-type genes; genome analyses revealing the presence of genes linked to sexuality; the functionality of sex-related genes; and formation of sex-related developmental structures...
June 2017: Microbiology Spectrum
keyword
keyword
101667
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"