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... Although the wheat A genomes have been intensively studied over past decades, many questions concerning the mechanisms of their divergence and evolution still remain unsolved. In the present study we performed comparative analysis of the A genome chromosomes in diploid (Triticum urartu Tumanian ex Gandilyan, 1972, Triticum boeoticum Boissier, 1874 and Triticum monococcum Linnaeus, 1753) and polypl ...
... Two ‘papers’ of Darwin's were read at the famous 1 July 1858 meeting of the Linnean Society: an excerpt from his 1844 essay and a summary of his theory, enclosed in an 1857 letter to Asa Gray. Quite apart from not selecting the essay excerpt, Darwin's letters appear to indicate that he definitely did not want, and hence did not expect, an excerpt from his 1844 essay to be included (and that he did ...
... Timing and magnitude of surface uplift are key to understanding the impact of crustal deformation and topographic growth on atmospheric circulation, environmental conditions, and surface processes. Uplift of the East African Plateau is linked to mantle processes, but paleoaltimetry data are too scarce to constrain plateau evolution and subsequent vertical motions associated with rifting. Here, we ...
biomarkers; breast neoplasms; cell proliferation; data collection; evolution; gene overexpression; humans; patients; somatic mutation
Abstract:
... Genomic sequencing studies of breast and other cancers have identified patterns of mutations that have been attributed to the endogenous mutator activity of APOBEC3B (A3B), a member of the AID/APOBEC family of cytidine deaminases. A3B gene expression is increased in many cancers, but its upstream drivers remain undefined. Furthermore, there exists a common germ-line deletion polymorphism ( A3B ᵈᵉˡ ...
... BACKGROUND: Feline calicivirus (FCV) is a common cause of upper respiratory tract disease in cats worldwide. Its characteristically high mutation rate leads to escape from the humoral immune response induced by natural infection and/or vaccination and consequently vaccines are not always effective against field isolates. Thus, there is a need to continuously investigate the ability of FCV vaccine ...
acidity; clementines; environmental factors; evolution; fruit drop; fruit maturity; fruit pulp; fruiting; hybrids; juices; mandarins; oranges; peduncle; ripening; sugars; total soluble solids; Corsica; Spain
Abstract:
... Citrus fruit development and ripening are complex processes involving physiological and biochemical changes that are under hormonal, nutritional and environmental control. One of the most evident phenomena in late maturation is shedding of ripe fruit. A study made in Spain on sweet oranges showed that fruit shedding was related to the increase of sugars content of fruit pulp juice. To investigate ...
... Rodents include both the cancer-susceptible short-lived mouse and the two unrelated cancer-resistant long-lived mole-rats. In this work, their genomes were analyzed with the goal to reveal pathways enriched in genes, which are more similar between the mole-rats than between the mouse and the naked mole-rat. The pathways related to cell cycle control were prominent. They include external signal tra ...
... Overuse of acetolactate synthase (ALS)–inhibiting herbicides in rice has led to the evolution of halosulfuron-resistant rice flatsedge in Arkansas and Mississippi. Resistant accessions were cross-resistant to labeled field rates of ALS-inhibiting herbicides from four different families, in comparison to a susceptible (SUS) biotype. Resistance index of Arkansas and Mississippi accessions based on a ...
... MAIN CONCLUSION : Besides being an important model to study desiccation tolerance, the induction of desiccation tolerance in germinated seeds may also play an ecological role in seedling establishment. Desiccation tolerance (DT) is the ability of certain organisms to survive extreme water losses without accumulation of lethal damage. This was a key feature in the conquering of dry land and is curr ...
... Horizontal gene transfer by conjugation plays a major role in bacterial evolution, allowing the acquisition of new traits, such as virulence and resistance to antibacterial agents. With the increased antibiotic resistance in bacterial pathogens, a better understanding of how bacteria modulate conjugation under changing environments and the genetic factors involved is needed. Despite the evolutiona ...
... Water velocity is one of the most important abiotic factors influencing the survival of aquatic insects in rivers and streams. The unidirectional water flow shaping their habitat and characteristically dividing it into alternating zones of high and low water velocity (riffles and pools) also imposes on them the special necessity to adapt to continual downstream drift. Here, we analyze an individua ...
Campanula rotundifolia; climatic factors; evolution; flowering; global warming; growing season; latitude; phenology; phenotypic plasticity; Alps region; Central European region; Netherlands; Scandinavia; Switzerland
Abstract:
... Plant populations need to adjust to climate warming through phenotypic plasticity or evolution of trait means. We performed a common-garden experiment with European populations of Campanula rotundifolia to investigate current adaptation in fitness-related traits and the potential for future adaptation. The common garden was situated in Switzerland and contained plants from 18 populations from four ...
... Furfural and acetic acid from lignocellulosic hydrolysates are the prevalent inhibitors to Zymomonas mobilis during cellulosic ethanol production. Developing a strain tolerant to furfural or acetic acid inhibitors is difficul by using rational engineering strategies due to poor understanding of their underlying molecular mechanisms. In this study, strategy of adaptive laboratory evolution (ALE) wa ...
... Innovations permit the diversification of lineages, but they may also impose functional constraints on behaviors such as locomotion. Thus, it is not surprising that secondary simplification of novel locomotory traits has occurred several times among vertebrates and could potentially lead to exceptional divergence when constraints are relaxed. For example, the gecko adhesive system is a remarkable ...
... Infectious diseases could be expected to evolve towards complete avirulence to their hosts if given enough time. However, this is not the case. Often, virulence is maintained because it is linked to adaptive advantages to the parasite, a situation that is often associated with the hypothesis known as the transmission–virulence trade-off hypothesis. Here, we argue that this hypothesis has three lim ...
... Bats are diverse, speciose, and inhabit most of earth’s habitats, aided by powered flapping flight. The many traits that enable flight in these mammals have long attracted popular and research interest, but recent technological and conceptual advances have provided investigators with new kinds of information concerning diverse aspects of flight biology. As a consequence of these new data, our unde ...
... Aeolian sediments are widely distributed in the eastern Qaidam Basin (QB), the main habitats for human in the hyper-arid basin during the Holocene, especially since 3 ka. The evolution of aeolian sediments is an important factor for the environmental change, and influence human activities and migration. However, many questions, e.g., when the aeolian sediments start to accumulate, what controls th ...
... Evolved interstellar ices observed in dense protostellar molecular clouds may arguably be considered as part of precometary materials that will later fall on primitive telluric planets, bringing a wealth of complex organic compounds. In our laboratory, experiments reproducing the photo/thermochemical evolution of these ices are routinely performed. Following previous amino acid identifications in ...
... Grape skin color is among the most important qualitative traits on which selection is based in wine and table grape breeding programmes. Skin color is determined by the quantity and composition of anthocyanins. In prior work on cultivated forms, it was shown that polymorphisms in the grape transcription factor family VvMYBA are responsible for anthocyanin content variation in the berries of cultiv ...
... A phenomenon already discovered more than 25 years ago is the possibility of naïve helper T cells to polarize into TH1 or TH2 populations. In a simplified model, these polarizations occur at opposite ends of an “immune 1-2 axis” (i1-i2 axis) of possible conditions. Additional polarizations of helper/regulatory T cells were discovered later, such as for example TH17 ...
... The influence of locally different species interactions on trait evolution is a focus of recent evolutionary studies. However, few studies have demonstrated that geographically different pollinator‐mediated selection influences geographic variation in floral traits, especially across a narrow geographic range. Here, we hypothesized that floral size variation in the Japanese herb Prunella vulgaris ...
Y chromosome; electrophoresis; evolution; forensic sciences; genetic distance; genetic variation; haplotypes; humans; loci; males; multidimensional scaling; nationalities and ethnic groups; variance; China
Abstract:
... To investigate genetic diversity in Chinese populations, 706 unrelated male individuals from five ethnic groups (Han, Korean, Hui, Mongolian, and Tibetan, respectively) were analyzed with 17 Y‐chromosomal STRs. The haplotype diversity was 0.99985 in the combined data. A total of 675 distinct haplotypes were observed, of which 649 were unique. Y‐chromosome haplogroups in the five groups were also p ...
... A series of problems, resulting from sediment deposition and channel silting, have occurred on the Hetao Plain as a result of changes to the Hobq Desert reach of the Yellow River. Therefore, improved research on channel evolution in this reach is vitally important. Using profile data from 80 channel cross-sections obtained in 1962, 1982, 1991 and 2000 from the Yellow River in the Hobq Desert, we s ...
... The evolution of greenish sepals from petaloid outer tepals has occurred repeatedly in various lineages of non-grass monocots. Studies in distinct monocot species showed that the evolution of sepals could be explained by the ABC model; for example, the defect of B-class function in the outermost whorl was linked to the evolution of sepals. Here, floral MADS-box genes from three sepal-bearing monoc ...
Laura J. Kelly; Simon Renny‐Byfield; Jaume Pellicer; Jiří Macas; Petr Novák; Pavel Neumann; Martin A. Lysak; Peter D. Day; Madeleine Berger; Michael F. Fay; Richard A. Nichols; Andrew R. Leitch; Ilia J. Leitch
DNA; Fritillaria; diploidy; evolution; genome; polyploidy; tandem repeat sequences; transposons
Abstract:
... Plants exhibit an extraordinary range of genome sizes, varying by > 2000‐fold between the smallest and largest recorded values. In the absence of polyploidy, changes in the amount of repetitive DNA (transposable elements and tandem repeats) are primarily responsible for genome size differences between species. However, there is ongoing debate regarding the relative importance of amplification of r ...
... It is well known that polyploidy is a major force in plant evolution and diversification. Evaluating the transmission of heterozygosity by 2n gametes with different formation mechanisms is of crucial importance. In the present study, 120 triploid hybrids [originating from first-division restitution (FDR), second-division restitution (SDR), and postmeiotic restitution (PMR) 2n eggs of the same fema ...
... Classification of bacteria is challenging due to the lack of a theory-based framework. In addition, the adaptation of bacteria to ecological niches often results in selection of strains with diverse virulence, pathogenicity and transmission characteristics. Bacterial strain diversity presents challenges for taxonomic classification, which in turn impacts the ability to develop accurate diagnostics ...
Fabio Cortesi; Zuzana Musilová; Sara M. Stieb; Nathan S. Hart; Ulrike E. Siebeck; Martin Malmstrøm; Ole K. Tørresen; Sissel Jentoft; Karen L. Cheney; N. Justin Marshall; Karen L. Carleton; Walter Salzburger
... Single-gene and whole-genome duplications are important evolutionary mechanisms that contribute to biological diversification by launching new genetic raw material. For example, the evolution of animal vision is tightly linked to the expansion of the opsin gene family encoding light-absorbing visual pigments. In teleost fishes, the most species-rich vertebrate group, opsins are particularly divers ...
... Anhydrobiosis is an adaptive strategy of certain organisms or specialised propagules to survive in the absence of water while programmed cell death (PCD) is a finely tuned cellular process of the selective elimination of targeted cell during developmental programme and perturbed biotic and abiotic conditions. Particularly during water stress both the strategies serve single purpose i.e., survival ...
... Antarctica is an isolated continent whose conditions challenge the survival of living organisms. High levels of endemism are now known in many Antarctic organisms, including algae, tardigrades, nematodes and microarthropods. Bdelloid rotifers are a key, widespread and abundant group of Antarctic microscopic invertebrates. However, their diversity, regional distribution and endemism have received l ...
... Staphylococcus aureus is a burden in human and veterinary medicine. During the last decade, an increasing number of studies reported the presence of livestock-associated methicillin-resistant S. aureus (LA-MRSA) clonal complex (CC) 398 in pigs. During 2013, a survey was performed in pig farms (n=328) randomly selected over Belgium, to monitor the current epidemiological situation of LA-MRSA among ...
Kimberley J. Hockings; Matthew R. McLennan; Susana Carvalho; Marc Ancrenaz; René Bobe; Richard W. Byrne; Robin I.M. Dunbar; Tetsuro Matsuzawa; William C. McGrew; Elizabeth A. Williamson; Michael L. Wilson; Bernard Wood; Richard W. Wrangham; Catherine M. Hill
... We are in a new epoch, the Anthropocene, and research into our closest living relatives, the great apes, must keep pace with the rate that our species is driving change. While a goal of many studies is to understand how great apes behave in natural contexts, the impact of human activities must increasingly be taken into account. This is both a challenge and an opportunity, which can importantly in ...
... Aposematism is unusual in herbivorous mammals, and exceptions help clarify its ecology and evolution. The Norwegian lemming differs from other rodents in colouration and behaviour. One hypothesis is that its black, yellow and white colours, loud calls and ferocious defence reduce predation by conspicuous aposematism. Another hypothesis is that the colouration is cryptic. These alternatives are tes ...
... Ethylene is perceived following binding to endoplasmic reticulum-localized receptors, which in Arabidopsis thaliana, include ETR1, ERS1, EIN4, ETR2, and ERS2. These receptors fall into two subfamilies based on conservation of features within their histidine kinase domain. Subfamily 1 contains ETR1 and ERS1 whereas subfamily 2 contains EIN4, ETR2, and ERS2. Because ethylene receptors are found only ...
... Geosmithia belongs among fungi living in symbiosis with phloem-feeding bark beetles. Several species have altered their ecology to that of obligatory symbiosis with ambrosia beetles, which has led to a shift in their phenotype and caused formation of large spherical conidia. In this study, we pose the following questions; (1) Is the conidial DNA content of Geosmithia correlated with conidial volum ...
... Aptamers are short and functional single-stranded oligonucleotide sequences selected from systematic evolution of ligands by exponential enrichment (SELEX) process, which have the capacity to recognize various classes of target molecules with high affinity and specificity. Various analytical aptamers acquired by SELEX are widely used in many research fields, such as medicine, biology, and chemistr ...
... DNA replicases routinely stall at lesions encountered on the template strand, and translesion DNA synthesis (TLS) is used to rescue progression of stalled replisomes. This process requires specialized polymerases that perform translesion DNA synthesis. Although prokaryotes and eukaryotes possess canonical TLS polymerases (Y-family Pols) capable of traversing blocking DNA lesions, most archaea lack ...
... We explore the relevance of honest signalling theory to the evolution of aposematism. We begin with a general consideration of models of signal stability, with a focus on the Zahavian costly signalling framework. Next, we review early models of signalling in the context of aposematism (some that are consistent and some inconsistent with costly honest signalling). We focus on controversies surround ...
... We review the literature on the geographic and taxonomic diversity of species of lizards and scorpions that are involved in predator–prey interactions. Somewhat surprisingly, lizards are often the predators in these interactions. Consequently, our goals were to evaluate whether lizard predators had evolved morphological or physiological resistance to scorpion venom or whether the rely on behaviora ...
... Some of the world's most economically and environmentally damaging introduced species reproduce asexually. While sexually reproducing introduced herbs have proven capable of rapid evolution, no previous study has quantified morphological changes in multiple obligatory asexually reproducing introduced species, or asked whether their potential for change differs from that of sexual species. We measu ...
... The possibility that a metabolomic approach can inform about the pathophysiology of a given form of epilepsy was addressed. Using chemometric analyses of HRMAS NMR data, we compared several brain structures in three rat strains with different susceptibilities to absence epilepsy: Genetic Absence Epilepsy Rats from Strasbourg (GAERS), Non Epileptic Control rats (NEC), and Wistar rats. Two ages were ...
Poecilia reticulata; body size; demographic statistics; environmental factors; evolution; excretion; field experimentation; freshwater ecosystems; life history; nitrogen; phosphorus; population density; predation; predators; rivers; sociodemographic characteristics; Trinidad and Tobago
Abstract:
... Trait evolution can occur in response to anthropogenic alterations to ecosystems and can occur on timescales similar to those of ecological processes suggesting that it could alter ecosystem function. In this study, we characterise the effects of life history evolution on nutrient recycling using the Trinidadian guppy (Poecilia reticulata) as a model system. Guppy life history traits evolve in res ...
... Literature on recovery of nitrogen and phosphorous from wastewater in the form of value-added struvite fertilizer has been critically reviewed towards the evolution of a sustainable management strategy. Presence of nitrogen and phosphorus is widespread in both domestic as well as industrial wastewater streams such as swine wastewater, landfill leachate, urine waste, dairy manure, coke wastewater, ...
nuclear magnetic resonance spectroscopy; cell growth; evolution; electron microscopy; nitrogen; carbon; leaves; Brassica napus; leaf development
Abstract:
... MAIN CONCLUSION : Differential palisade and spongy parenchyma structural changes in oilseed rape leaf were demonstrated. These dismantling processes were linked to early senescence events and associated to remobilization processes. During leaf senescence, an ordered cell dismantling process allows efficient nutrient remobilization. However, in Brassica napus plants, an important amount of nitrogen ...
... Lambda-cyhalothrin, a sodium channel modulator insecticide, has been used frequently for the control of house flies, Musca domestica L. (Diptera: Muscidae) worldwide, including Pakistan. This experiment was performed to determine the selection and assessment of lambda-cyhalothrin resistance evolution along with four other insecticides. After 26 generations of selection, the lambda-cyhalothrin-sele ...
... Clustered regularly interspaced short palindromic repeats (CRISPR), which is considered to be an immune system for bacteria, has been widely used as a tool for genome editing and genotyping. It has also been reported to be associated with virulence factors in some bacteria. To understand the role of CRISPR in the virulence and evolution of pathogenic Vibrio parahaemolyticus, 154 V. parahaemolyticu ...
B.C.J. van den Berg; F.J. Sierro; F.J. Hilgen; R. Flecker; J.C. Larrasoaña; W. Krijgsman; J.A. Flores; M.P. Mata; E. Bellido Martín; J. Civis; J.A. González-Delgado
... We present a new high-resolution cyclostratigraphic age model for the Messinian sediments of the Montemayor-1 core. This core was drilled in the Guadalquivir Basin in southern Spain, which formed part of the marine corridor linking the Mediterranean with the Atlantic in the Late Miocene. Tuning of high-resolution geochemical records reveals a strong precessional cyclicity, with maximum clastic sup ...
Abies balsamea; allometry; biomass; canopy; carbon; environmental factors; evolution; forests; models; resource allocation; shade tolerance; species diversity; trees
Abstract:
... There is a lack of consensus in theoretical and empirical literature on whether height–diameter (H:D) relationships of canopy trees are asymptotic. To investigate H:D allometry, particularly in the transition to the canopy, we focused on shade‐tolerant Abies balsamea, across steep physical gradients associated with elevation, and correlated biotically generated gradients of stem density, canopy he ...
ecosystems; evolution; fractal dimensions; fungi; hyphae; image analysis; mathematical theory; microbial growth; mycelium; space and time
Abstract:
... Due to their ability to grow in complex environments, fungi play an important role in most ecosystems and have for that reason been the subject of numerous studies. Some of the main obstacles to the study of fungal growth are the heterogeneity of growth environments and the limited scope of laboratory experiments.Given the increasing availability of image capturing techniques, a new approach lies ...
... The emergence of mechanically-delivered armatures was a crucial event in human evolution, indicating technological and cognitive advances. Morphometric analysis has been the most commonly employed method to explore this subject. While a morphometric analysis can demonstrate a potential capability as a projectile, it is inevitable that the analyzed sample includes artifacts that were not used as hu ...
... Bacteria form a broad spectrum of symbioses with eukaryotes. This permits reconstruction of the symbiogenesis processes providing the transformation of free-living microorganisms into cellular organelles. In ecologically (conditionally) obligate symbioses, an increase in the size and complexity of the bacterial genome structure was observed. This was associated with segregation of the regions cont ...
... Bacteriophages are types of viruses that infect bacteria. They are the most abundant and diverse entities in the biosphere, and influence the evolution of most bacterial species by promoting gene transfer, sometimes in unexpected ways. Although pac-type phages can randomly package and transfer bacterial DNA by a process called generalized transduction, some mobile genetic elements have developed e ...
... Baculoviruses, members of the family Baculoviridae, are large, enveloped viruses that contain a double‐stranded circular DNA genome of 80–180 kbp, encoding 90–180 putative proteins. These viruses are exclusively pathogenic for arthropods, particularly insects, and have been developed, or are being developed, as environmentally sound pesticides and eukaryotic vectors for foreign protein expression, ...
... Major histocompatibility complex (MHC) is a family of highly polymorphic genes activating adaptive immunity in vertebrates. However, the underlying mechanism of MHC evolution is still not fully understood. In this study, we investigated genetic variation of three classical MHC class I genes in the giant panda (Ailuropoda melanoleuca) and tested for selection effect and recombination event across e ...
Mungos mungo; evolution; females; inbreeding; inbreeding depression; kin recognition; males; mammals; mating behavior; paternity; philopatry; probability; random mating
Abstract:
... Inbreeding and inbreeding avoidance are key factors in the evolution of animal societies, influencing dispersal and reproductive strategies which can affect relatedness structure and helping behaviours. In cooperative breeding systems, individuals typically avoid inbreeding through reproductive restraint and/or dispersing to breed outside their natal group. However, where groups contain multiple p ...
... Lay Summary Behavior is flexible and flexibility depends on the cognitive mechanisms of decision making, which are often biased and sometimes irrational. From formal models of optimal (but biologically implausible) computation, I derive a simple, versatile and biologically plausible decision mechanism, which values options as deviations from an expected standard, weighted by assessment accuracy. I ...
... A broad range of animals use visual signals to assess potential mates, and the theory of sensory exploitation suggests variation in visual systems drives mate preference variation due to sensory bias. Trinidadian guppies (Poecilia reticulata), a classic system for studies of the evolution of female mate choice, provide a unique opportunity to test this theory by looking for covariation in visual t ...
... Pollinators visit flowers for rewards and should therefore have a preference for floral signals that indicate reward status, so called ‘honest signals’. We investigated honest signalling in Brassica rapa L. and its relevance for the attraction of a generalised pollinator, the bumble bee Bombus terrestris (L.). We found a positive association between reward amount (nectar sugar and pollen) and the ...
... Predators exert a strong selective force on the ecosystems in which they exist, thereby altering the structure of ecological communities and leading to the evolution of prey defences. However, how interspecific differences in defence ability affect habitat partitioning amongst competing prey species remains unresolved. We examined how prey defences affect species distribution in a natural ecosyste ...
Chiroptera; acoustics; ecology; evolution; flight; leaves; roosting behavior; social behavior
Abstract:
... The limited availability of refuges may represent an important factor promoting the evolution of sociality, particularly in bats. Spix's disc-winged bats (Thyroptera tricolor) show highly specialized morphological adaptations that enable individuals to roost inside furled musoid leaves. This roosting ecology presents major challenges, as leaves rapidly unfurl, forcing bats to locate new roosts on ...
environmental protection; evolution; hydrologic data; pollution load; remote sensing; river deltas; sediment yield; sediments; stream channels; China; Yellow River
Abstract:
... Long-term hydrological data and remotely-sensed satellite images were used to analyze the effects of the water–sediment regulation scheme (WSRS) implemented in the lower Yellow River (LYR), China, between 1983 and 2013. The WSRS aimed to control channel scouring in the LYR and maintain the Yellow River Delta (YRD). Channel erosion in the LYR has primarily depended on the incoming sediment concentr ...
... Genomic imprinting of the Cdkn1c/Kcnq1ot1 region shows lack of conservation between human and mouse. This region has been reported to be associated with Beckwith–Wiedemann syndrome (BWS) and cancer. To increase our understanding of imprinted genes in bovine Cdkn1c/Kcnq1ot1 imprinting cluster, we assessed the imprinting status of four cattle genes (Tssc4, Nap1l4, Phlda2 and Osbpl5) in seven types o ...
... Mammalian and avian genomes are characterized by a substantial spatial heterogeneity of GC-content, which is often interpreted as reflecting the effect of local GC-biased gene conversion (gBGC), a meiotic repair bias that favors G and C over A and T alleles in high-recombining genomic regions. Surprisingly, the first fully sequenced nonavian sauropsid (i.e., reptile), the green anole Anolis caroli ...
... In grasses such as rice or maize, the distribution of genic GC content is well known to be bimodal. It is mainly driven by GC content at third codon positions (GC3 for short). This feature is thought to be specific to grasses as closely related species like banana have a unimodal GC3 distribution. GC3 is associated with numerous genomics features and uncovering the origin of this peculiar distribu ...
aquacultural and fisheries equipment; bioeconomics; demographic statistics; discount rate; evolution; life history; models; mortality; overfishing; stocking rate
Abstract:
... Fishing reduces stock size and shifts demographics, and selective mortality may also lead to evolutionary changes. Previous studies suggest that traits may change evolutionarily because of fishing on decadal time scales. Here we examine the potential bioeconomic impacts of fishing-induced evolutionary change. We used a life-history model with stock dynamics based on evolving maturation age, which ...
evolution; gene activation; genes; genotoxicity; human diseases; humans; transposons
Abstract:
... Mobile genetic elements within genomes have been known to drive genome evolution in diverse ways. Since developing high-technology for whole-genome sequencing, many researchers have focused on not only how mobile genetic elements have affected the evolution of genes and their function, particularly of human and mammals, but also how these elements involve in gene activation or inactivation associa ...
... Covering: up to 2014 Marine cyanobacteria are an ancient group of organisms and prolific producers of bioactive secondary metabolites. These compounds are presumably optimized by evolution over billions of years to exert high affinity for their intended biological target in the ecologically relevant organism but likely also possess activity in different biological contexts such as human cells. Scr ...
... We used the eddy-covariance technique to measure the temporal dynamics and the relationships between leaf area index (LAI) and exchanges of carbon dioxide (CO2), latent heat (LE) and sensible heat (H) in a multi-genotype short-rotation poplar coppice (SRC) located in East-Flanders (Belgium). The study was carried out over four years (2010–2013) corresponding to the first two rotations of the plant ...
... Adaptive laboratory evolution has proven a valuable strategy for metabolic engineering. Here, we established an experimental evolution approach for improving microbial metabolite production by imposing an artificial selective pressure on the fluorescent output of a biosensor using fluorescence-activated cell sorting. Cells showing the highest fluorescent output were iteratively isolated and (re-)c ...
... MAIN CONCLUSION : MpBHY codes for a carotene β-ring 3(,3′)-hydroxylase responsible for both zeaxanthin and lutein biosynthesis in liverwort. MpCYP97C functions as an ε-ring hydroxylase (zeinoxanthin 3′-hydroxylase) to produce lutein in liverwort. Xanthophylls are oxygenated or hydroxylated carotenes that are most abundant in the light-harvesting complexes of plants. The plant-type xanthophylls con ...
... Of two contending models for eukaryotic evolution the “archezoan“ has an amitochondriate eukaryote take up an endosymbiont, while “symbiogenesis“ states that an Archaeon became a eukaryote as the result of this uptake. If so, organelle formation resulting from new engulfments is simplified by the primordial symbiogenesis, and less informative regarding the bacterium‐to‐mitochondrion conversion. Gr ...
... Previous studies of mouse embryos concluded that after the optic vesicle evaginates from the ventral forebrain and contacts the surface ectoderm, signals from the ectoderm specify the distal region of the optic vesicle to become retina and signals from the optic vesicle induce the lens. Germline deletion of Bmp4 resulted in failure of lens formation. We performed conditional deletion of Bmp4 from ...
... Light and electron microscopy were used to compare spider book lung development with earlier studies of the development of horseshoe crab book gills and scorpion book lungs. Histological studies at the beginning of the 20th century provided evidence that spider and scorpion book lungs begin with outgrowth of a few primary lamellae (respiratory furrows, saccules) from the posterior surface of opist ...
... Clostridial neurotoxins (CNTs) are the deadliest toxins known and the causative agents of botulism and tetanus. Despite their structural and functional complexity, no CNT homologs are currently known outside Clostridium. Here, we report the first homologs of Clostridium CNTs within the genome of the rice fermentation organism Weissella oryzae SG25. One gene in W. oryzae S25 encodes a protein with ...
... Nature has supplied the inexhaustible resources for mankind, and at the same time, it has also progressively developed into the school for scientists and engineers. Through more than four billions years of rigorous and stringent evolution, different creatures in nature gradually exhibit their own special and fascinating biological functional surfaces. For example, sharkskin has the potential drag- ...
... Symptoms of bovine viral diarrhea virus (BVDV) infection range from subclinical to severe, depending on strain virulence. Several in vitro studies showed BVDV infection impaired leukocyte function. Fewer studies have examined the effects of in vivo BVDV infection on monocyte/macrophage function, especially with strains of differing virulence. We characterized cytokine production by bovine myeloid ...
... There is remarkable diversity in brain size among vertebrates, but surprisingly little is known about how ecological species interactions impact the evolution of brain size. Using guppies, artificially selected for large and small brains, we determined how brain size affects survival under predation threat in a naturalistic environment. We cohoused mixed groups of small‐ and large‐brained individu ...
Crocuta crocuta; Hyaena; Primates; animal behavior; body size; carnivores; cognition; evolution; frontal lobe; mammals; prediction; problem solving; social behavior; zoos
Abstract:
... Theoretically intelligence should evolve to help animals solve specific types of problems posed by the environment, but it remains unclear how environmental complexity or novelty facilitates the evolutionary enhancement of cognitive abilities, or whether domain-general intelligence can evolve in response to domain-specific selection pressures. The social complexity hypothesis, which posits that in ...
Daniel J. Crawford; Gregory J. Anderson; Lurdes Borges Silva; Miguel Menezes de Sequeira; Mónica Moura; Arnoldo Santos-Guerra; John K. Kelly; Mark E. Mort
... Plants on oceanic islands often originate from self-compatible (SC) colonizers capable of seed set by self-fertilization. This fact is supported by empirical studies, and is rooted in the hypothesis that one (or few) individuals could find a sexual population, whereas two or more would be required if the colonizers were self-incompatible (SI). However, a SC colonizer would have lower heterozygosit ...
... 330 I. 330 II. 331 III. 332 IV. 333 334 References 334 SUMMARY: One of the most striking innovations in flower development is the congenital or postgenital union of petals (sympetaly) which has enabled dramatic specialization in flower structure and possibly accelerated speciation rates. Sympetalous flowers exhibit extraordinary variation in development, including the degree and timing of fusion, ...
Xenopus; early development; eggs; embryo (animal); embryogenesis; evolution; frogs; models; organogenesis; tadpoles; temperature
Abstract:
... The large size and rapid development of amphibian embryos has facilitated ground-breaking discoveries in developmental biology. Here, we describe the embryogenesis of the Budgett's frog (Lepidobatrachus laevis), an unusual species with eggs that are over twice the diameter of laboratory Xenopus, and embryos that can tolerate higher temperatures to develop into a tadpole four times more rapidly. In ...
... The genetic enhancement of wild animals and plants for characteristics that benefit human populations has been practiced for thousands of years, resulting in impressive improvements in commercially valuable species. Despite these benefits, genetic manipulations are rarely considered for noncommercial purposes, such as conservation and restoration initiatives. Over the last century, humans have dri ...
... The proinsulin C-peptide has molecular, cellular and organismal activities but lacks disease-associated mutations or short-term loss-of-function effects. This dilemma between activity and function may be explained from its evolutionary setting with insulin as an ancestral partner. The charge, approximate length and flexibility of C-peptide are all that is required for the insulin interactions, whi ...
... Calmodulin (CaM) is a well-studied calcium sensor that is ubiquitous in all eukaryotes and contributes to signaling during developmental processes and adaptation to environmental stimuli. Among eukaryotes, plants have a remarkable variety of CaM-like proteins (CMLs). The expansion of genomic data sets offers the opportunity to explore CaM and CML evolution among the green lineage from algae to lan ...
... During the decades following World War II diverse groups of American biologists established a variety of distinctive approaches to organismal biology. Rhetorically, organismal biology could be used defensively to distinguish established research traditions from perceived threats from newly emerging fields such as molecular biology. But, organismal biologists were also interested in integrating bio ...
... The natural environment of the human pathogen Campylobacter jejuni is the gastrointestinal tract of warm‐blooded animals. In the gut, the availability of oxygen is limited; therefore, less efficient electron acceptors such as nitrate or fumarate are used by C. jejuni. The molecular mechanisms that regulate the activity of the highly branched respiratory chain of C. jejuni are still a mystery mainl ...
... The recent finding that the human version of a neurodevelopmental enhancer of the Wnt receptor Frizzled 8 (FZD8) gene alters neural progenitor cell cycle timing and brain size is a step forward to understanding human brain evolution. The human brain is distinctive in terms of its cognitive abilities as well as its susceptibility to neurological disease. Identifying which of the millions of genomic ...
... Human adults and children respond negatively to inequity, even sacrificing personal gain to avoid both disadvantageous (more for you, less for me) and advantageous (more for me, less for you) resource allocations. Recent work has argued that some nonhuman animals share this response, but findings for inequity aversion outside of humans are controversial. Unfortunately, animals' negative responses ...
DNA; DNA repair; Nobel Prize; bacteria; chemistry; disease resistance; evolution; metabolism; researchers
Abstract:
... This year, the Nobel Prize in Chemistry has been awarded to Tomas Lindahl, Aziz Sancar, and Paul Modrich for their seminal studies of the mechanisms by which cells from bacteria to man repair DNA damage that is generated by normal cellular metabolism and stress from the environment. These studies beautifully illustrate the remarkable power of DNA repair to influence life from evolution through dis ...
... For the fruit postharvest physiologist, discussions of cell wall metabolism initially bring to mind the processes associated with the fruit softening that occurs during ripening. Fruit softening traditionally has been equated to the series of apoplast-localized events that lead to textural changes, which are desired by most consumers. Among these events, the enzyme-catalyzed breakdown and solubili ...
... The role of genetic relatedness in the evolution of eusociality has been the topic of much debate, especially when contrasting eusocial insects with vertebrates displaying reproductive altruism. The naked mole‐rat, Heterocephalus glaber, was the first described eusocial mammal. Although this discovery was based on an ecological constraints model of eusocial evolution, early genetic studies reporte ...
Rotavirus A; children; evolution; gastroenteritis; genes; genetic background; humans; Japan
Abstract:
... Rotavirus A (RVA) is a leading cause of acute gastroenteritis in young children worldwide. Most human RVA strains are classified into three major genotype constellations: Wa-like, DS-1-like and AU-1-like. The evolution of G2P[4] strains possessing the DS-1-like genetic background was described in a few recent studies. However, the strains analyzed in these studies were almost exclusively the ones ...
... Sucrose phosphate synthase (SPS) is a key enzyme in the production of sucrose. Five SPS gene families have been identified in monocotyledonous plants including sugarcane. Using SPS family-specific primers to four of the five families (we had previously characterised the fifth gene family), an approximately 400-nt region was amplified from the parents of a sugarcane mapping population, namely the c ...
Vratislav Peška; Petr Fajkus; Miloslava Fojtová; Martina Dvořáčková; Jan Hapala; Vojtěch Dvořáček; Pavla Polanská; Andrew R. Leitch; Eva Sýkorová; Jiří Fajkus
... The characterization of unusual telomere sequence sheds light on patterns of telomere evolution, maintenance and function. Plant species from the closely related genera Cestrum, Vestia and Sessea (family Solanaceae) lack known plant telomeric sequences. Here we characterize the telomere of Cestrum elegans, work that was a challenge because of its large genome size and few chromosomes (1C 9.76 pg; ...
Vitis vinifera; breeding; correlation; data collection; evolution; genes; grapes; linkage disequilibrium; multidimensional scaling; single nucleotide polymorphism
Abstract:
... BACKGROUND AND AIMS: Linkage disequilibrium (LD) is an important tool in studies of genetics and evolution. In the cultivated species of Vitis vinifera, LD has been extensively surveyed; however, in other Vitis species, LD has not previously been reported. Patterns of LD in five populations of 48 Vitis species and 248 accessions were extensively characterised in this study. METHODS AND RESULTS: Pa ...
... Sclerotinia homoeocarpa F.T. Bennett is a filamentous member of Ascomycota that causes dollar spot, the most economically important disease of turfgrass worldwide. We sequenced and characterized the mating-type (MAT) locus of four recently-collected contemporary strains causing dollar spot, four historical type strains used to describe the fungus, and three species of Rutstroemiaceae. Moreover, we ...
... 2-Ketoisovalerate is an important cellular intermediate for the synthesis of branched-chain amino acids as well as other important molecules, such as pantothenate, coenzyme A, and glucosinolate. This ketoacid can also serve as a precursor molecule for the production of biofuels, pharmaceutical agents, and flavor agents in engineered organisms, such as the betaproteobacterium Ralstonia eutropha. Th ...
... Premise of the study: Microsatellite primers were developed in the perennial herbs of the diploid-polyploid complex Veronica subsect. Pentasepalae (Plantaginaceae) to investigate the role that hybridization has played in the evolution of the group, which includes several endangered species. Methods and Results: Twelve pairs of primers leading to polymorphic and readable markers were identified and ...
... Fusarium graminearum species complex (FGSC) members cause Fusarium head blight (FHB) of wheat (Triticum aestivum L.) and small grains in the United States. The U.S. population is diverse and includes several genetically distinct local emergent subpopulations, some more aggressive and toxigenic than the majority population. Kentucky is a transition zone between the Mid-Atlantic and Midwestern wheat ...