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https://www.readbyqxmd.com/read/29784759/of-what-use-is-connectomics-a-personal-perspective-on-the-drosophila-connectome
#1
REVIEW
Ian A Meinertzhagen
The brain is a network of neurons and its biological output is behaviour. This is an exciting age, with a growing acknowledgement that the comprehensive compilation of synaptic circuits densely reconstructed in the brains of model species is now both technologically feasible and a scientifically enabling possibility in neurobiology, much as 30 years ago genomics was in molecular biology and genetics. Implemented by huge advances in electron microscope technology, especially focused ion beam-scanning electron microscope (FIB-SEM) milling (see Glossary), image capture and alignment, and computer-aided reconstruction of neuron morphologies, enormous progress has been made in the last decade in the detailed knowledge of the actual synaptic circuits formed by real neurons, in various brain regions of the fly Drosophila It is useful to distinguish synaptic pathways that are major, with 100 or more presynaptic contacts, from those that are minor, with fewer than about 10; most neurites are both presynaptic and postsynaptic, and all synaptic sites have multiple postsynaptic dendrites...
May 20, 2018: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29784342/rapid-and-sensitive-detection-of-staphylococcus-aureus-assisted-by-polydopamine-modified-magnetic-nanoparticles
#2
Xiaomei Gao, Xin Yao, Zitao Zhong, Li Jia
Pathogens cause significant morbidity and mortality to humans. Thus, development of fast and reliable methods for detection and identification of pathogens is urgently needed to increase protection level of public health and ensure the safety of consumers. Herein, a rapid and sensitive method has been developed for Staphylococcus aureus (S. aureus) detection based on the dual role of polydopamine modified magnetic nanoparticles (PDA@Fe3 O4 NPs) combined with polymerase chain reaction (PCR) and capillary electrophoresis (CE)...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29783622/risk-mitigation-for-immunocompromised-consumers-of-mucormycete-spoiled-and-fermented-foods-germain-guidance-and-remaining-needs
#3
REVIEW
Abigail B Snyder, Randy W Worobo
Mucoralean invasive fungal infections, while unusual among the general population, have a high mortality rate among immunocompromised individuals who become infected. They are also common spoilage organisms in cultured dairy products, some fresh produce, and baked goods. Additionally, Mucor and Rhizopus spp. are utilized in the production of traditional fermented foods including mold ripened cheeses and fermented soy products. The risk that consumption of these foods poses to immunocompromised consumers has been previously identified...
May 18, 2018: Microorganisms
https://www.readbyqxmd.com/read/29783050/disruption-of-ergosterol-and-tryptophan-biosynthesis-as-well-as-cell-wall-integrity-pathway-and-the-intracellular-ph-homeostasis-lead-to-mono-2-ethylhexyl-phthalate-toxicity-in-budding-yeast
#4
Linghuo Jiang, Litong Wang, Tianshu Fang, Vassilios Papadopoulos
Endocrine disrupting chemicals (EDCs) are substances in the environment, food, and consumer products that interfere with hormone homeostasis, metabolism or reproduction in humans and animals. One such EDC, the plasticizer di-(2-ethylhexyl)-phthalate (DEHP), exerts its function through its principal bioactive metabolite, mono-(2-ethylhexyl)-phthalate (MEHP). To fully understand the effects of MEHP on cellular processes and metabolism as well as to assess the impact of genetic alteration on the susceptibility to MEHP-induced toxicity, we screened MEHP-sensitive mutations on a genome-scale in the eukaryotic model organism Saccharomyces cerevisiae...
May 15, 2018: Chemosphere
https://www.readbyqxmd.com/read/29779773/reverse-line-probe-assay-for-cheap-detection-of-single-nucleotide-polymorphisms-in-mycobacterium-tuberculosis
#5
Memona Yasmin, Guislaine Refregier, Rubina Tabassum Siddiqui, Rizwan Iqbal, Shahid Ahmad Abbasi, Sabira Tahseen
More and more Single Nucleotide Polymosrphisms of interest among pathogenic organisms are described with the advent of Whole Genome Sequencing but WGS approach is still too expensive, time consuming, and relying on bioinformatical means that are not available in many developing countries. This study presents a low-cost reverse hybridization line probe technique for detecting SNPs in Mycobacterium tuberculosis. The proposed test is able to detect mutations in the RRDR of rpoB gene in M. tuberculosis with specificity and sensitivity of 98% and 100%, respectively and for an average cost of less than €3 per sample...
May 2018: Tuberculosis
https://www.readbyqxmd.com/read/29771304/laboratory-evolution-for-forced-glucose-xylose-co-consumption-enables-identification-of-mutations-that-improve-mixed-sugar-fermentation-by-xylose-fermenting-saccharomyces-cerevisiae
#6
Ioannis Papapetridis, Maarten D Verhoeven, Sanne J Wiersma, Maaike Goudriaan, Antonius J A van Maris, Jack T Pronk
Simultaneous fermentation of glucose and xylose can contribute to improved productivity and robustness of yeast-based processes for bioethanol production from lignocellulosic hydrolysates. This study explores a novel laboratory evolution strategy for identifying mutations that contribute to simultaneous utilization of these sugars in batch cultures of Saccharomyces cerevisiae. To force simultaneous utilization of xylose and glucose, the genes encoding glucose-6-phosphate isomerase (PGI1) and ribulose-5-phosphate epimerase (RPE1) were deleted in a xylose-isomerase-based xylose-fermenting strain with a modified oxidative pentose-phosphate pathway...
May 15, 2018: FEMS Yeast Research
https://www.readbyqxmd.com/read/29765361/biodiversity-of-environmental-leptospira-improving-identification-and-revisiting-the-diagnosis
#7
Roman Thibeaux, Dominique Girault, Emilie Bierque, Marie-Estelle Soupé-Gilbert, Anna Rettinger, Anthony Douyère, Michael Meyer, Gregorio Iraola, Mathieu Picardeau, Cyrille Goarant
Leptospirosis is an important environmental disease and a major threat to human health causing at least 1 million clinical infections annually. There has recently been a growing interest in understanding the environmental lifestyle of Leptospira . However, Leptospira isolation from complex environmental samples is difficult and time-consuming and few tools are available to identify Leptospira isolates at the species level. Here, we propose a polyphasic isolation and identification scheme, which might prove useful to recover and identify environmental isolates and select those to be submitted to whole-genome sequencing...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29762619/isolation-and-genome-sequencing-of-individual-circulating-tumor-cells-using-hydrogel-encapsulation-and-laser-capture-microdissection
#8
Emily S Park, Justin P Yan, Richard A Ang, Jeong Hyun Lee, Xiaoyan Deng, Simon P Duffy, Kevin Beja, Matti Annala, Peter C Black, Kim N Chi, Alexander W Wyatt, Hongshen Ma
Circulating tumor cells (CTCs) are malignant cells released into the bloodstream with the potential to form metastases in secondary sites. These cells, acquired non-invasively, represent a sample of highly relevant tumor tissue that is an alternative to difficult and low-yield tumor biopsies. In recent years, there has been growing interest in genomic profiling of CTCs to enable longitudinal monitoring of the tumor's adaptive response to therapy. However, due to their extreme rarity, genotyping CTCs has proved challenging...
May 15, 2018: Lab on a Chip
https://www.readbyqxmd.com/read/29754566/current-ethical-and-legal-issues-in-health-related-direct-to-consumer-genetic-testing
#9
Emilia Niemiec, Louiza Kalokairinou, Heidi Carmen Howard
A variety of health-related genetic testing is currently advertized directly to consumers. This article provides a timely overview of direct-to-consumer genetic testing (DTC GT) and salient ethical issues, as well as an analysis of the impact of the recently adopted regulation on in vitro diagnostic medical devices on DTC GT. DTC GT companies currently employ new testing approaches, report on a wide spectrum of conditions and target new groups of consumers. Such activities raise ethical issues including the questionable analytic and clinical validity of tests, the adequacy of informed consent, potentially misleading advertizing, testing in children, research uses and commercialization of genomic data...
September 2017: Personalized Medicine
https://www.readbyqxmd.com/read/29749067/outlaws-old-laws-no-laws-the-prospects-of-gene-editing-for-agriculture-in-the-usa
#10
Wayne Parrott
The advent of genome-edited products that are nearing commercialization in agriculture has highlighted that the USA biotechnology regulatory system has not kept pace with technological advances. Of the three agencies that regulate engineered crops and animals for agriculture, only one has indicated how it will regulate edited plants. The Food and Drug Administration can regulate any plant, but has not indicated if it will single out edited plants. The United States Department of Agriculture currently has no authority over edited plants when the edit is a deletion or does not contain any added DNA from a plant pest...
May 10, 2018: Physiologia Plantarum
https://www.readbyqxmd.com/read/29748819/recent-advances-in-steroidal-saponins-biosynthesis-and-in-vitro-production
#11
REVIEW
Swati Upadhyay, Gajendra Singh Jeena, Shikha, Rakesh Kumar Shukla
Steroidal saponins exhibited numerous pharmacological activities due to the modification of their backbone by different cytochrome P450s (P450) and UDP glycosyltransferases (UGTs). Plant-derived steroidal saponins are not sufficient for utilizing them for commercial purpose so in vitro production of saponin by tissue culture, root culture, embryo culture, etc, is necessary for its large-scale production. Saponin glycosides are the important class of plant secondary metabolites, which consists of either steroidal or terpenoidal backbone...
May 10, 2018: Planta
https://www.readbyqxmd.com/read/29747442/safety-evaluations-of-bifidobacterium-bifidum-bgn4-and-bifidobacterium-longum-bori
#12
Min Jeong Kim, Seockmo Ku, Sun Young Kim, Hyun Ha Lee, Hui Jin, Sini Kang, Rui Li, Tony V Johnston, Myeong Soo Park, Geun Eog Ji
Over the past decade, a variety of lactic acid bacteria have been commercially available to and steadily used by consumers. However, recent studies have shown that some lactic acid bacteria produce toxic substances and display properties of virulence. To establish safety guidelines for lactic acid bacteria, the Food and Agriculture Organization of the United Nations (FAO)/World Health Organization (WHO) has suggested that lactic acid bacteria be characterized and proven safe for consumers’ health via multiple experiments (e...
May 9, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29745758/evaluation-of-heating-conditions-for-inactivation-of-hepatitis-e-virus-genotypes-3-and-4
#13
Toshifumi Imagawa, Ryuichi Sugiyama, Tomoyuki Shiota, Tian-Cheng Li, Sayaka Yoshizaki, Takaji Wakita, Koji Ishii
Hepatitis E virus (HEV) is a causative agent of acute hepatitis throughout the world. HEV genotypes 1 through 4 infect humans, whereas genotypes 3 and 4 (Gt3 and Gt4) also infect other animals. In developed countries, the main HEV infection route is by foodborne transmission, resulting from the consumption of undercooked meat. It is important to know the criteria for HEV control in daily cooking. In this study, we assessed the heat conditions required to inactivate HEV Gt3 and Gt4 in culture supernatants and spiked minced pork meat...
May 10, 2018: Journal of Food Protection
https://www.readbyqxmd.com/read/29743506/self-reference-and-random-sampling-approach-for-label-free-identification-of-dna-composition-using-plasmonic-nanomaterials
#14
Lindsay M Freeman, Lin Pang, Yeshaiahu Fainman
The analysis of DNA has led to revolutionary advancements in the fields of medical diagnostics, genomics, prenatal screening, and forensic science, with the global DNA testing market expected to reach revenues of USD 10.04 billion per year by 2020. However, the current methods for DNA analysis remain dependent on the necessity for fluorophores or conjugated proteins, leading to high costs associated with consumable materials and manual labor. Here, we demonstrate a potential label-free DNA composition detection method using surface-enhanced Raman spectroscopy (SERS) in which we identify the composition of cytosine and adenine within single strands of DNA...
May 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29741246/high-throughput-sequencing-for-diagnosing-platelet-disorders-lessons-learned-from-exploring-the-causes-of-bleeding-disorders
#15
REVIEW
J Heremans, K Freson
Inherited platelet disorders (IPDs) are a heterogeneous group of disorders caused by multiple genetic defects. Obtaining a molecular diagnosis for IPD patients using a phenotype- and laboratory-based approach is complex, expensive, time-consuming, and not always successful. High-throughput sequencing (HTS) methods offer a genotype-based approach to facilitate molecular diagnostics. Such approaches are expected to decrease time to diagnosis, increase the diagnostic rate, and they have provided novel insights into the genotype-phenotype correlation of IPDs...
May 2018: International Journal of Laboratory Hematology
https://www.readbyqxmd.com/read/29736260/mutation-load-estimation-model-as-a-predictor-of-the-response-to-cancer-immunotherapy
#16
Guan-Yi Lyu, Yu-Hsuan Yeh, Yi-Chen Yeh, Yu-Chao Wang
The determination of the mutation load, a total number of nonsynonymous point mutations, by whole-exome sequencing was shown to be useful in predicting the treatment responses to cancer immunotherapy. However, this technique is expensive and time-consuming, which hampers its application in clinical practice. Therefore, the objective of this study was to construct a mutation load estimation model for lung adenocarcinoma, using a small set of genes, as a predictor of the immunotherapy treatment response. Using the somatic mutation data downloaded from The Cancer Genome Atlas (TCGA) database, a computational framework was developed...
2018: NPJ Genomic Medicine
https://www.readbyqxmd.com/read/29731757/an-efficient-crispr-cas9-platform-for-rapidly-generating-simultaneous-mutagenesis-of-multiple-gene-homoeologs-in-allotetraploid-oilseed-rape
#17
Chao Li, Mengyu Hao, Wenxiang Wang, Hui Wang, Fan Chen, Wen Chu, Baohong Zhang, Desheng Mei, Hongtao Cheng, Qiong Hu
With the rapid development of sequence specific nucleases (SSNs) for genome targeting, clustered regularly interspaced short palindromic repeats/CRISPR-associated protein 9 (CRISPR/Cas9) is now considered the most promising method for functional genetic researches, as well as genetic improvement in crop plants. However, the gene redundancy feature within the allotetraploid rapeseed genome is one of the major obstacles for simultaneous modification of different homologs in the first generation. In addition, large scale screening to identify mutated transgenic plants is very time-and labor-consuming using the conventional restriction enzyme-based approaches...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29730298/exploring-the-biophysical-properties-of-phytosterols-in-the-plasma-membrane-for-novel-cancer-prevention-strategies
#18
REVIEW
Omar Fakih, Didem Sanver, David Kane, James L Thorne
Cancer is a global problem with no sign that incidences are reducing. The great costs associated with curing cancer, through developing novel treatments and applying patented therapies, is an increasing burden to developed and developing nations alike. These financial and societal problems will be alleviated by research efforts into prevention, or treatments that utilise off-patent or repurposed agents. Phytosterols are natural components of the diet found in an array of seeds, nuts and vegetables and have been added to several consumer food products for the management of cardio-vascular disease through their ability to lower LDL-cholesterol levels...
May 3, 2018: Biochimie
https://www.readbyqxmd.com/read/29728389/insight-into-energy-conservation-via-alternative-carbon-monoxide-metabolism-in-carboxydothermus-pertinax-revealed-by-comparative-genome-analysis
#19
Yuto Fukuyama, Kimiho Omae, Yasuko Yoneda, Takashi Yoshida, Yoshihiko Sako
Carboxydothermus species are some of the most studied thermophilic carboxydotrophs. Their varied carboxydotrophic growth properties suggest distinct strategies for energy conservation via CO metabolism. In this study, we used comparative genome analysis of the genus Carboxydothermus to show variations in the CO dehydrogenase/energy-converting hydrogenase gene cluster, which is responsible for CO metabolism with H2 production (hydrogenogenic CO metabolism). Indeed, ability or inability to produce H2 with CO oxidation is explained by the presence or absence of this gene cluster in C...
May 4, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29725931/the-impact-of-winter-relocation-and-depuration-on-norovirus-concentrations-in-pacific-oysters-harvested-from-a-commercial-production-site
#20
Agnieszka Rupnik, Sinéad Keaveney, Leon Devilly, Francis Butler, William Doré
Oysters contaminated with norovirus present a significant public health risk when consumed raw. In this study, norovirus genome copy concentrations were determined in Pacific oysters (Magallana gigas) harvested from a sewage-impacted production site and then subjected to site-specific management procedures. These procedures consisted of relocation of oysters to an alternative production area during the norovirus high-risk winter periods (November to March) followed by an extended depuration (self-purification) under controlled temperature conditions...
May 3, 2018: Food and Environmental Virology
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