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https://www.readbyqxmd.com/read/28339470/meiotic-recombination-modulates-the-structure-and-dynamics-of-the-synaptonemal-complex-during-c-elegans-meiosis
#1
Divya Pattabiraman, Baptiste Roelens, Alexander Woglar, Anne M Villeneuve
During meiotic prophase, a structure called the synaptonemal complex (SC) assembles at the interface between aligned pairs of homologous chromosomes, and crossover recombination events occur between their DNA molecules. Here we investigate the inter-relationships between these two hallmark features of the meiotic program in the nematode C. elegans, revealing dynamic properties of the SC that are modulated by recombination. We demonstrate that the SC incorporates new subunits and switches from a more highly dynamic/labile state to a more stable state as germ cells progress through the pachytene stage of meiotic prophase...
March 24, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28338804/duplications-and-positive-selection-drive-the-evolution-of-parasitism-associated-gene-families-in-the-nematode-strongyloides-papillosus
#2
Praveen Baskaran, Tegegn G Jaleta, Adrian Streit, Christian Rödelsperger
Gene duplication is one major mechanism playing a role in the evolution of phenotypic complexity and in the generation of novel traits. By comparing parasitic and nonparasitic nematodes, a recent study found that the evolution of parasitism in Strongyloididae is associated with a large expansion in the Astacin and CAP gene families.To gain novel insights into the developmental processes in the sheep parasite Strongyloides papillosus, we sequenced transcriptomes of different developmental stages and sexes. Overall, we found that the majority of genes are developmentally regulated and have one-to-one orthologs in the diverged S...
March 2, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28338679/entomopathogenic-bacteria-use-multiple-mechanisms-for-bioactive-peptide-library-design
#3
Xiaofeng Cai, Sarah Nowak, Frank Wesche, Iris Bischoff, Marcel Kaiser, Robert Fürst, Helge B Bode
The production of natural product compound libraries has been observed in nature for different organisms such as bacteria, fungi and plants; however, little is known about the mechanisms generating such chemically diverse libraries. Here we report mechanisms leading to the biosynthesis of the chemically diverse rhabdopeptide/xenortide peptides (RXPs). They are exclusively present in entomopathogenic bacteria of the genera Photorhabdus and Xenorhabdus that live in symbiosis with nematodes delivering them to insect prey, which is killed and utilized for nutrition by both nematodes and bacteria...
April 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28338077/characterization-of-the-soluble-nsf-attachment-protein-gene-family-identifies-two-members-involved-in-additive-resistance-to-a-plant-pathogen
#4
Naoufal Lakhssassi, Shiming Liu, Sadia Bekal, Zhou Zhou, Vincent Colantonio, Kris Lambert, Abdelali Barakat, Khalid Meksem
Proteins with Tetratricopeptide-repeat (TPR) domains are encoded by large gene families and distributed in all plant lineages. In this study, the Soluble NSF-Attachment Protein (SNAP) subfamily of TPR containing proteins is characterized. In soybean, five members constitute the SNAP gene family: GmSNAP18, GmSNAP11, GmSNAP14, GmSNAP02, and GmSNAP09. Recently, GmSNAP18 has been reported to mediate resistance to soybean cyst nematode (SCN). Using a population of recombinant inbred lines from resistant and susceptible parents, the divergence of the SNAP gene family is analysed over time...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28337680/morphological-and-molecular-identification-of-habronema-spp-nematoda-habronematidae-from-donkeys-in-xinjiang-china-and-notes-on-the-taxonomical-status-of-habronema-majus-creplin-1849-and-h-microstoma-schneider-1866
#5
Rui Jian, Shi-Wei Wang, Wei-Xin Zhang, Lu-Ping Zhang
Habronematid nematodes were collected from the stomachs of donkeys, Equus asinus L., in the Tarim Basin, Xinjiang, China. After examination by light and scanning electron microscopy, Habronema muscae (Carter, 1861) and H. majus (Creplin, 1849) were identified. The morphology of our specimens representing H. muscae (Carter, 1861) agreed well with previous redescriptions in the shape of the lateral lips, origin of the lateral alae, ratio of left and right spicules, and number and arrangement of caudal papillae...
March 23, 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/28336910/populus-trichocarpa-encodes-small-effector-like-secreted-proteins-that-are-highly-induced-during-mutualistic-symbiosis
#6
Jonathan M Plett, Hengfu Yin, Ritesh Mewalal, Rongbin Hu, Ting Li, Priya Ranjan, Sara Jawdy, Henrique C De Paoli, George Butler, Tessa Maureen Burch-Smith, Hao-Bo Guo, Chun Ju Chen, Annegret Kohler, Ian C Anderson, Jessy L Labbé, Francis Martin, Gerald A Tuskan, Xiaohan Yang
During symbiosis, organisms use a range of metabolic and protein-based signals to communicate. Of these protein signals, one class is defined as 'effectors', i.e., small secreted proteins (SSPs) that cause phenotypical and physiological changes in another organism. To date, protein-based effectors have been described in aphids, nematodes, fungi and bacteria. Using RNA sequencing of Populus trichocarpa roots in mutualistic symbiosis with the ectomycorrhizal fungus Laccaria bicolor, we sought to determine if host plants also contain genes encoding effector-like proteins...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28336605/draft-genome-sequence-of-chromobacterium-subtsugae-mwu12-2387-isolated-from-a-wild-cranberry-bog-in-truro-massachusetts
#7
Kristin Vöing, Alisha Harrison, Scott D Soby
Chromobacterium subtsugae MWU12-2387 was isolated from the rhizosphere of cranberry plants. While it is unknown what environmental role these bacteria play in bog soils, they hold potential as biological control agents against nematodes and insect pests. Potential virulence genes were identified, including the violacein synthesis pathway, siderophores, and several chitinases.
March 23, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28334204/transcriptomic-and-histological-responses-of-african-rice-oryza-glaberrima-to-meloidogyne-graminicola-provide-new-insights-into-root-knot-nematode-resistance-in-monocots
#8
Anne-Sophie Petitot, Tina Kyndt, Rana Haidar, Alexis Dereeper, Myriam Collin, Janice de Almeida Engler, Godelieve Gheysen, Diana Fernandez
Background and Aims: The root-knot nematode Meloidogyne graminicola is responsible for production losses in rice ( Oryza sativa ) in Asia and Latin America. The accession TOG5681 of African rice, O. glaberrima , presents improved resistance to several biotic and abiotic factors, including nematodes. The aim of this study was to assess the cytological and molecular mechanisms underlying nematode resistance in this accession. Methods: Penetration and development in M...
February 28, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28334182/evaluation-of-different-applications-of-ethanedinitrile-c2n2-in-various-fumigation-chambers-for-control-of-monochamus-alternatus-coleoptera-cerambycidae-in-naturally-infested-logs
#9
Byung-Ho Lee, Chung-Gyoo Park, Yonglin Ren
Monochamus alternatus Hopeis is an important vector of nematode pests of timber in Korea, particularly Bursaphelenchus xylophilus (Steiner & Buhrer) Nickle. Previously, we reported that ethanedinitrile (C2N2) has the potential to replace methyl bromide and metam sodium to control M. alternatus larvae and B. xylophilus under low-temperature (<5 °C) conditions. Herein, we report on fumigation trials of C2N2 over a 3-yr period (February 2013-October 2015) conducted at higher temperatures. The trials were conducted under 24 different conditions that incorporated varying fumigation chamber types (plastic sheeting-enclosed chambers of differing construction or an ISO shipping container, interior size: 5...
March 3, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334040/macrophage-origin-limits-functional-plasticity-in-helminth-bacterial-co-infection
#10
Dominik Rückerl, Sharon M Campbell, Sheelagh Duncan, Tara E Sutherland, Stephen J Jenkins, James P Hewitson, Tom A Barr, Lucy H Jackson-Jones, Rick M Maizels, Judith E Allen
Rapid reprogramming of the macrophage activation phenotype is considered important in the defense against consecutive infection with diverse infectious agents. However, in the setting of persistent, chronic infection the functional importance of macrophage-intrinsic adaptation to changing environments vs. recruitment of new macrophages remains unclear. Here we show that resident peritoneal macrophages expanded by infection with the nematode Heligmosomoides polygyrus bakeri altered their activation phenotype in response to infection with Salmonella enterica ser...
March 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28333289/the-role-of-daf-21-hsp90-in-mouth-form-plasticity-in-pristionchus-pacificus
#11
Bogdan Sieriebriennikov, Gabriel V Markov, Hanh Witte, Ralf J Sommer
Phenotypic plasticity is increasingly recognized to facilitate adaptive change in plants and animals, including insects, nematodes and vertebrates. Plasticity can occur as continuous or discrete (polyphenisms) variation. In social insects, e.g. in ants, some species have workers of distinct size classes while in other closely related species variation in size may be continuous. Despite the abundance of examples in nature, how discrete morphs are specified remains currently unknown. In theory, polyphenisms might require robustness, whereby the distribution of morphologies would be limited by the same mechanisms that execute buffering from stochastic perturbations, a function attributed to heat-shock proteins of the Hsp90 family...
March 13, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28331602/positive-selection-of-il-33-in-adaptive-immunity-of-domestic-chinese-goats
#12
Akhtar Rasool Asif, Muhammad Awais, Sumayyah Qadri, Hafiz Ishfaq Ahmad, Xiaoyong Du
The identification of the candidate genes that play key role in phenotypic variation in livestock populations can provide new information about evolution and positive selection. IL-33 (71954) (Interleukin) gene is associated with the increased nematode resistance in small ruminants; however, the role of IL-33 for the genetic control of different diseases in Chinese goat breeds is poorly described in scientific literature. Therefore, the current investigation was performed for the better understanding of the molecular evolution and the positive selection of single-nucleotide polymorphism in IL-33 gene...
March 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28330511/cytochrome-c-oxidase-subunit-i-haplotype-reveals-high-genetic-diversity-of-angiostrongylus-malaysiensis-nematoda-angiostrongylidae
#13
P Eamsobhana, H S Yong, S L Song, A Prasartvit, S Boonyong, A Tungtrongchitr
The rat lungworm Angiostrongylus malaysiensis is a metastrongyloid nematode parasite. It has been reported in Malaysia, Thailand, Laos, Myanmar, Indonesia and Japan. In this study, A. malaysiensis adult worms recovered from the lungs of wild rats in different geographical regions/provinces in Thailand were used to determine their haplotype by means of the mitochondrial partial cytochrome c oxidase subunit I (COI) gene sequence. The results revealed high COI haplotype diversity of A. malaysiensis from Thailand...
March 23, 2017: Journal of Helminthology
https://www.readbyqxmd.com/read/28330273/purification-and-characterization-of-polygalacturonase-from-aspergillus-fumigatus-mtcc-2584-and-elucidating-its-application-in-retting-of-crotalaria-juncea-fiber
#14
Gautam Anand, Sangeeta Yadav, Dinesh Yadav
Polygalacturonases represents an important member of pectinases group of enzymes with diverse industrial applications and is widely distributed among fungi, bacteria, yeasts, plants and some plant parasitic nematodes. An endo-polygalacturonase from a new fungal source Aspergillus fumigatus MTCC 2584 was produced under solid-state fermentation conditions and was purified simply by acetone precipitation and gel-filtration chromatography technique. The approximate molecular weight of the purified PG was found to be 43...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330100/molecular-characterization-and-amplified-ribosomal-dna-restriction-analysis-of-entomopathogenic-bacteria-associated-with-rhabditis-oscheius-spp
#15
Balakrishnan Geetha Sangeetha, Cheruvandasseri Arumughan Jayaprakas, Jinachandrannair Vijayakumari Siji, Moochattil Rajitha, Basheerkutty Shyni, Chellappan Mohandas
Bacterial strains associated with entomopathogenic nematodes (EPNs) Rhabditis (Oscheius) spp. were isolated from infected cadavers of Galleria mellonella. The obtained 18 isolates were subdivided into nine phylogenetically different genera based on comparative sequence analysis of their 16S rRNA genes. The isolates were affiliated to three different class namely γ-proteobacteria (Enterobacter, Proteus, Providencia, Pseudomonas, Stenotrophomonas), β-proteobacteria (Alcaligenes) and Bacilli (Bacillus, Enterococcus, Lysinibacillus)...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28327883/chapiniella-variabilis-nematoda-parasitizing-chelonoidis-carbonarius-and-c-denticulatus-testudinidae-in-the-state-of-piau%C3%A3
#16
Simone Mousinho Freire, Anangela Ravena da Silva Leal, Marcelo Knoff, Delir Corrêa Gomes, Jeannie Nascimento Dos Santos, Elane Guerreiro Giese, Reinaldo José da Silva, Ivete Lopes Mendonça
Chapiniella variabilis (Chapin, 1924), a strongylid nematode, was collected parasitizing the large intestine of the tortoises Chelonoidis carbonarius (Spix, 1824) (Cc) and C. denticulatus (Linnaeus, 1766) (Cd) in the Zoobotanical Park of the municipality of Teresina, state of Piauí, Brazil. The taxonomic identification was based on morphological and morphometric features, using bright-field and scanning electron microscopy. The present study adds new observations on the morphology, mainly relating to the mouth papillae, external and internal leaf-crown elements, excretory pore, deirids and male and female posterior end...
March 16, 2017: Revista Brasileira de Parasitologia Veterinária, Brazilian Journal of Veterinary Parasitology
https://www.readbyqxmd.com/read/28327808/prevalence-and-distribution-of-angiostrongylus-cantonensis-nematoda-angiostrongylidae-in-achatina-fulica-mollusca-gastropoda-in-baixada-santista-s%C3%A3-o-paulo-brazil
#17
Laura Rocha Guerino, Iracy Lea Pecora, Marcel Sabino Miranda, Cryslaine Aguiar-Silva, Omar Dos Santos Carvalho, Roberta Lima Caldeira, Reinaldo José da Silva
INTRODUCTION: Angiostrongylus cantonensis is causes eosinophilic meningoencephalitis in humans. Worldwide expansion of this nematode is linked to the dispersion of their hosts. This study aimed to determine the prevalence of A. cantonensis infection in Achatina fulica in the nine municipalities that make up Baixada Santista, São Paulo, Brazil. METHODS: Angiostrongylus cantonensis larvae were analyzed using optical microscopy. We performed polymerase chain reaction and restriction fragment length polymorphism using restriction endonuclease ClaI, directed to the internal transcribed spacer region 2 of A...
January 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28326696/history-of-research-on-c-elegans-and-other-free-living-nematodes-as-model-organisms
#18
Victor Marc Nigon, Marie-Anne Félix
The nematode Caenorhabditis elegans is now a major model organism in biology. The choice of Sydney Brenner to adopt this species in the mid-1960s and the success of his team in raising it to a model organism status have been told (http://www.wormbook.org/toc_wormhistory.html; Brenner, 2001; Ankeny, 2001). Here we review the pre-Brenner history of the use of free-living nematodes as models for general questions in biology. We focus on the period that started in 1899 with the first publication of Emile Maupas mentioning Rhabditis elegans and ended in 1974 with the first publications by Brenner...
March 21, 2017: WormBook: the Online Review of C. Elegans Biology
https://www.readbyqxmd.com/read/28326345/methionine-restriction-alters-bone-morphology-and-affects-osteoblast-differentiation
#19
Amadou Ouattara, Diana Cooke, Raj Gopalakrishnan, Tsang-Hai Huang, Gene P Ables
Methionine restriction (MR) extends the lifespan of a wide variety of species, including rodents, drosophila, nematodes, and yeasts. MR has also been demonstrated to affect the overall growth of mice and rats. The objective of this study was to evaluate the effect of MR on bone structure in young and aged male and female C57BL/6J mice. This study indicated that MR affected the growth rates of males and young females, but not aged females. MR reduced volumetric bone mass density (vBMD) and bone mineral content (BMC), while bone microarchitecture parameters were decreased in males and young females, but not in aged females compared to control-fed (CF) mice...
December 2016: Bone Reports
https://www.readbyqxmd.com/read/28326124/adverse-effects-of-hydroalcoholic-extracts-and-the-major-components-in-the-stems-of-impatiens-balsamina-l-on-caenorhabditis-elegans
#20
Hong-Fang Jiang, Zi-Heng Zhuang, Bei-Wei Hou, Bao-Jun Shi, Cheng-Jie Shu, Lei Chen, Guo-Xin Shi, Wei-Ming Zhang
Impatiens balsamina L. (Balsaminaceae), an annual herb found throughout China, has been extensively used in traditional Chinese medicine (TCM). However, our knowledge regarding the adverse effects of I. balsamina in vivo is very limited. In this present study, the nematode Caenorhabditis elegans model was employed to fully assess the adverse effects of hydroalcoholic (EtOH 55%) extracts of I. balsamina stems (HAEIBS) in vivo. After exposure to 10 mg/mL HAEIBS, the major organism-level endpoints of C. elegans of percent survival, frequency of head thrash and body bends, and reproduction had decreased by 24%, 30%, and 25%, respectively...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
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