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https://www.readbyqxmd.com/read/28545145/respiratory-response-to-temperature-of-three-populations-of-aurelia-aurita-polyps-in-northern-europe
#1
Danja P Höhn, Cathy H Lucas, Sven Thatje
The benthic life stage (polyp or scyphistoma) of the bloom-forming jellyfish, Aurelia aurita (Linnaeus, 1759), also known as the moon jellyfish, contributes to the seasonal occurrence and abundance of medusa blooms via asexual reproduction. A. aurita is widely distributed in coastal areas in northern Europe, and one of the most studied jellyfish species. While the physiology of the visible medusa is largely understood, understanding of the physiology of the perennial benthic life-stage is scarce. To measure the physiological tolerance of A...
2017: PloS One
https://www.readbyqxmd.com/read/28544612/ecology-adaptation-and-function-of-methane-sulfidic-spring-water-biofilm-microorganisms-including-a-strain-of-anaerobic-fungus-mucor-hiemalis
#2
Enamul Hoque, Johannes Fritscher
Ecological aspects, adaptation, and some functions of a special biofilm and its unique key anaerobic fungus Mucor hiemalis strain EH11 isolated from a pristine spring (Künzing, Bavaria, Germany) are described. The spring's pure nature is characterized by, for example, bubbling methane, marine-salinity, mild hydrothermal (~19.1°C), sulfidic, and reductive-anoxic (Eh : -241 to -253 mV, O2 : ≤ 0.1 mg/L) conditions. It is geoecologically located at the border zone between Bavarian Forest (crystalline rocky mountains) and the moor-like Danube River valley, where geological displacements bring the spring's water from the deeper layers of former marine sources up to the surface...
May 24, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28544028/subcellular-compartmentation-interdependency-and-dynamics-of-the-cyclic-amp-dependent-pka-subunits-during-pathogenic-differentiation-in-rice-blast
#3
Poonguzhali Selvaraj, Tham Hong Fai, Ravikrishna Ramanujam, Naweed I Naqvi
The cAMP-dependent PKA signaling plays a central role in growth, asexual development and pathogenesis in fungal pathogens. Here, we functionally characterized RPKA, the regulatory subunit of cAMP/PKA and studied the dynamics and organization of the PKA subunits in the rice blast pathogen Magnaporthe oryzae. The RPKA subunit was essential for proper vegetative growth, asexual sporulation and surface hydrophobicity in M. oryzae. A spontaneous suppressor mutation, SMR19, that restored growth and conidiation in the RPKA deletion mutant was isolated and characterized...
May 20, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28542484/simulating-within-vector-generation-of-the-malaria-parasite-diversity
#4
Lauren M Childs, Olivia F Prosper
Plasmodium falciparum, the most virulent human malaria parasite, undergoes asexual reproduction within the human host, but reproduces sexually within its vector host, the Anopheles mosquito. Consequently, the mosquito stage of the parasite life cycle provides an opportunity to create genetically novel parasites in multiply-infected mosquitoes, potentially increasing parasite population diversity. Despite the important implications for disease transmission and malaria control, a quantitative mapping of how parasite diversity entering a mosquito relates to diversity of the parasite exiting, has not been undertaken...
2017: PloS One
https://www.readbyqxmd.com/read/28535256/epigenetic-and-genetic-contributions-to-adaptation-in-chlamydomonas
#5
Ilkka Kronholm, Andrew Bassett, David Baulcombe, Sinéad Collins
Epigenetic modifications, such as DNA methylation or histone modifications, can be transmitted between cellular or organismal generations. However, there are no experiments measuring their role in adaptation, so here we use experimental evolution to investigate how epigenetic variation can contribute to adaptation. We manipulated DNA methylation and histone acetylation in the unicellular green alga Chlamydomonas reinhardtii both genetically and chemically to change the amount of epigenetic variation generated or transmitted in adapting populations in three different environments (salt stress, phosphate starvation, and high CO2) for two hundred asexual generations...
May 23, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28530581/metabolic-phenotyping-of-various-tea-camellia-sinensis-l-cultivars-and-understanding-of-their-intrinsic-metabolism
#6
Hyang-Gi Ji, Yeong-Ran Lee, Min-Seuk Lee, Kyeong Hwan Hwang, Eun-Hee Kim, Jun Seong Park, Young-Shick Hong
Recently, we selected three tea (Camellia sinensis) cultivars that are rich in taste, epigallocatechin-3-O-gallate (EGCG) and epigallocatechin-3-O-(3-O-methyl)-gallate (EGCG3″Me) and then cultivated them through asexual propagation by cutting in the same region. In the present study, proton nuclear magnetic resonance ((1)H NMR)-based metabolomics was applied to characterize the metabotype and to understand the metabolic mechanism of these tea cultivars including wild type tea. Of the tea leaf metabolite variations, reverse associations of amino acid metabolism with catechin compound metabolism were found in the rich-taste, and EGCG- and EGCG3″Me-rich tea cultivars...
October 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28526032/multiplex-dnase-free-one-step-reverse-transcription-pcr-for-plasmodium-18s-rrna-and-spliced-gametocyte-specific-mrnas
#7
Amelia E Hanron, Zachary P Billman, Annette M Seilie, Tayla M Olsen, Matthew Fishbaugher, Ming Chang, Thomas Rueckle, Nicole Andenmatten, Bryan Greenhouse, Emmanuel Arinaitwe, John Rek, Smita Das, Gonzalo J Domingo, Kelly Shipman, Stefan H Kappe, James G Kublin, Sean C Murphy
BACKGROUND: Plasmodium gametocytes are sexual stages transmitted to female Anopheles mosquitoes. While Plasmodium parasites can be differentiated microscopically on Giemsa-stained blood smears, molecular methods are increasingly used because of their increased sensitivity. Molecular detection of gametocytes requires methods that discriminate between asexual and sexual stage parasites. Commonly tested gametocyte-specific mRNAs are pfs25 and pfs230 detected by reverse transcription polymerase chain reaction (RT-PCR)...
May 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28525580/a-new-formulation-of-random-genetic-drift-and-its-application-to-the-evolution-of-cell-populations
#8
Yuxin Chen, Ding Tong, Chung-I Wu
Random genetic drift, or stochastic change in gene frequency, is a fundamental evolutionary force that is usually defined within the ideal Wright-Fisher (WF) population. However, as the theory is increasingly applied to populations that deviate strongly from the ideal model, a paradox of random drift has emerged. When drift is defined by the WF model, it becomes stronger as the population size, N, decreases. However, the intensity of competition decreases when N decreases and, hence, drift might become weaker...
May 19, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28522360/sex-with-no-regrets-how-sexual-reproduction-uses-a-no-regret-learning-algorithm-for-evolutionary-advantage
#9
Omer Edhan, Ziv Hellman, Dana Sherill-Rofe
The question of 'why sex' has long been a puzzle. The randomness of recombination, which potentially produces low fitness progeny, contradicts notions of fitness landscape hill climbing. We use the concept of evolution as an algorithm for learning unpredictable environments to provide a possible answer. While sex and asex both implement similar machine learning no-regret algorithms in the context of random samples that are small relative to a vast genotype space, the algorithm of sex constitutes a more efficient goal-directed walk through this space...
May 15, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28515780/evolution-and-the-duration-of-a-doomed-population
#10
Richard Gomulkiewicz, Stephen M Krone, Christopher H Remien
Many populations are doomed to extinction, but little is known about how evolution contributes to their longevity. We address this by modeling an asexual population consisting of genotypes whose abundances change independently according to a system of continuous branching diffusions. Each genotype is characterized by its initial abundance, growth rate, and reproductive variance. The latter two components determine the genotype's "risk function" which describes its per capita probability of extinction at any time...
June 2017: Evolutionary Applications
https://www.readbyqxmd.com/read/28513586/hundreds-of-dual-stage-antimalarial-molecules-discovered-by-a-functional-gametocyte-screen
#11
Celia Miguel-Blanco, Irene Molina, Ana I Bardera, Beatriz Díaz, Laura de Las Heras, Sonia Lozano, Carolina González, Janneth Rodrigues, Michael J Delves, Andrea Ruecker, Gonzalo Colmenarejo, Sara Viera, María S Martínez-Martínez, Esther Fernández, Jake Baum, Robert E Sinden, Esperanza Herreros
Plasmodium falciparum stage V gametocytes are responsible for parasite transmission, and drugs targeting this stage are needed to support malaria elimination. We here screen the Tres Cantos Antimalarial Set (TCAMS) using the previously developed P. falciparum female gametocyte activation assay (Pf FGAA), which assesses stage V female gametocyte viability and functionality using Pfs25 expression. We identify over 400 compounds with activities <2 μM, chemically classified into 57 clusters and 33 singletons...
May 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28513283/molecular-characterisation-of-australian-isolates-of-puccinia-graminis-f-sp-tritici-supports-long-term-clonality-but-also-reveals-cryptic-genetic-variation
#12
Jianping Zhang, Peng Zhang, Haydar Karaoglu, Robert F Park
Long term surveys of pathogenicity in Puccinia graminis f. sp. tritici (Pgt) in Australia have implicated mutation as a major source of virulence, at times leading to the demise of stem rust resistant wheat cultivars and substantial yield losses. Since 1925, these surveys have identified at least four occasions on which exotic isolates of Pgt appeared in Australia, with each acting as a founding isolate that gave rise sequentially to derivative pathotypes via presumed single step mutation. The current study aimed to examine the relationship between virulence and molecular patterns using SSR markers on selected isolates of Pgt collected in Australia during a 52 year period in order to propose an evolutionary pathway...
May 17, 2017: Phytopathology
https://www.readbyqxmd.com/read/28510588/evolutionary-restoration-of-fertility-in-an-interspecies-hybrid-yeast-by-whole-genome-duplication-after-a-failed-mating-type-switch
#13
Raúl A Ortiz-Merino, Nurzhan Kuanyshev, Stephanie Braun-Galleani, Kevin P Byrne, Danilo Porro, Paola Branduardi, Kenneth H Wolfe
Many interspecies hybrids have been discovered in yeasts, but most of these hybrids are asexual and can replicate only mitotically. Whole-genome duplication has been proposed as a mechanism by which interspecies hybrids can regain fertility, restoring their ability to perform meiosis and sporulate. Here, we show that this process occurred naturally during the evolution of Zygosaccharomyces parabailii, an interspecies hybrid that was formed by mating between 2 parents that differed by 7% in genome sequence and by many interchromosomal rearrangements...
May 2017: PLoS Biology
https://www.readbyqxmd.com/read/28510363/purification-toxoplasma-gondii-tissue-cysts-using-percoll-gradients
#14
Elizabeth A Watts, Animesh Dhara, Anthony P Sinai
The protozoan parasite Toxoplasma gondii is capable of infecting all warm-blooded animals and humans. Infectious, transmissible forms of the parasite include oocysts produced by the sexual cycle within the definitive feline host and tissue cysts that form Toxoplasma in the central nervous system and muscle during the asexual cycle within all chronically infected warm-blooded hosts. These tissue cysts are populated with slow-growing bradyzoites, which until recently have been thought to be dormant entities in the context of immune sufficiency...
May 16, 2017: Current Protocols in Microbiology
https://www.readbyqxmd.com/read/28502250/antiplasmodial-dihetarylthioethers-target-the-coenzyme-a-synthesis-pathway-in-plasmodium-falciparum-erythrocytic-stages
#15
Thomas Weidner, Leonardo Lucantoni, Abed Nasereddin, Lutz Preu, Peter G Jones, Ron Dzikowski, Vicky M Avery, Conrad Kunick
BACKGROUND: Malaria is a widespread infectious disease that threatens a large proportion of the population in tropical and subtropical areas. Given the emerging resistance against the current standard anti-malaria chemotherapeutics, the development of alternative drugs is urgently needed. New anti-malarials representing chemotypes unrelated to currently used drugs have an increased potential for displaying novel mechanisms of action and thus exhibit low risk of cross-resistance against established drugs...
May 15, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28501690/toxicity-estimates-for-diuron-and-atrazine-for-the-tropical-marine-cnidarian-exaiptasia-pallida-and-in-hospite-symbiodinium-spp-using-pam-chlorophyll-a-fluorometry
#16
Pelli Louise Howe, Amanda Jean Reichelt-Brushett, Malcolm William Clark, Cliff Ross Seery
Effective ecotoxicological risk assessments for herbicides in tropical marine environments are restricted by a lack of toxicity data, sensitive test methods and endpoints for relevant species, and this requires rectification. The symbiotic sea anemone Exaiptasia pallida is a suitable test species, representing the phylum Cnidaria and allowing for assessments of toxicological responses of both the animal host and in-hospite Symbiodinium spp. Pulse amplitude modulated (PAM) chlorophyll-a fluorometry is recognised as a valuable ecotoxicological tool, and here newly-developed test methods are presented using PAM fluorometry to measure herbicide effects on photosynthetic efficiency of in-hospite Symbiodinium spp...
May 6, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28498997/initiation-of-gametocytogenesis-at-very-low-parasite-density-in-plasmodium-falciparum-infection
#17
Ryan Farid, Matthew W Dixon, Leann Tilley, James S McCarthy
The recent focus on the elimination of malaria has led to an increased interest in the role of sexual stages in its transmission. We introduce Plasmodium falciparum gametocyte exported protein-5 (PfGEXP5) transcript analysis as an important tool for evaluating the earliest (ring) stage sexual gametocytes in the blood of infected individuals. We show that gametocyte rings are detected in the peripheral blood immediately following establishment of asexual infections-without the need for triggers such as high-density asexual parasitemia or drug treatment...
April 1, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28498866/cognitive-adaptation-in-asexual-and-sexual-wasps-living-in-contrasted-environments
#18
Lucie Froissart, Martin Giurfa, Sandrine Sauzet, Emmanuel Desouhant
Differences in learning and memory dynamics between populations are suspected to result from differences in ecological constraints such as resource distribution. The two reproductive modes (strains) of the parasitoid wasp Venturia canescens share the same geographical areas but live in contrasting habitats: arrhenotokous wasps live in the wild (generally orchards), whereas thelytokous ones live mostly in stored-products buildings (e.g. granaries). This species thus represents a relevant biological model for understanding the relationship between the ecological constraints faced by a species and its memory and learning ability...
2017: PloS One
https://www.readbyqxmd.com/read/28496148/genetic-structure-of-cercospora-beticola-populations-on-beta-vulgaris-in-new-york-and-hawaii
#19
Niloofar Vaghefi, Scot C Nelson, Julie R Kikkert, Sarah J Pethybridge
Cercospora leaf spot (CLS), caused by Cercospora beticola, is a major disease of Beta vulgaris worldwide. No sexual stage is known for C. beticola but in its asexual form it overwinters on infected plant debris as pseudostromata, and travels short distances by rain splash-dispersed conidiospores. Cercospora beticola infects a broad range of host species and may be seedborne. The relative contribution of these inoculum sources to CLS epidemics on table beet is not well understood. Pathogen isolates collected from table beet, Swiss chard and common lambsquarters in mixed-cropping farms and monoculture fields in New York and Hawaii, USA, were genotyped (n = 600) using 12 microsatellite markers...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28494201/exploring-sexual-behaviors-and-health-communication-among-older-women
#20
Caroline D Bergeron, Heather Honoré Goltz, Leigh Szucs, Jovanni V Reyes, Kelly L Wilson, Marcia G Ory, Matthew Lee Smith
Older women around the globe are generally depicted as asexual beings, which may impact patient-provider discussions about sex. We examined data on 703 aging women in the United States to compare factors associated with women perceiving sex as important and women discussing sex with their physicians since turning age 50. While 65.1% of participants perceived sex to be important, only 23.8% discussed sex with their providers since turning age 50. Factors related to discussing sex included age, education, having a chronic condition, and consuming alcohol...
May 11, 2017: Health Care for Women International
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