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Genetic engineering

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https://www.readbyqxmd.com/read/28934416/transporter-engineering-in-biomass-utilization-by-yeast
#1
Kiyotaka Y Hara, Jyumpei Kobayashi, Ryosuke Yamada, Daisuke Sasaki, Yuki Kuriya, Yoko Hirono-Hara, Jun Ishii, Michihiro Araki, Akihiko Kondo
Biomass resources are attractive carbon sources for bioproduction because of their sustainability. Many studies have been performed using biomass resources to produce sugars as carbon sources for cell factories. Expression of biomass hydrolyzing enzymes in cell factories is an important approach for constructing biomass-utilizing bioprocesses because external addition of these enzymes is expensive. In particular, yeasts have been extensively engineered to be cell factories that directly utilize biomass because of their manageable responses to many genetic engineering tools, such as gene expression, deletion and editing...
November 1, 2017: FEMS Yeast Research
https://www.readbyqxmd.com/read/28934381/carboxysomes-metabolic-modules-for-co2-fixation
#2
Aiko Turmo, C Raul Gonzalez-Esquer, Cheryl A Kerfeld
The carboxysome is a bacterial microcompartment encapsulating the enzymes carbonic anhydrase and ribulose-1,5-bisphosphate carboxylase/oxygenase. As the site of CO2 fixation, it serves an essential role in the carbon dioxide concentrating mechanism of many chemoautotrophs and all cyanobacteria. Carboxysomes and other bacterial microcompartments self-assemble through specific protein-protein interactions that are typically mediated by conserved protein domains. In this review, we frame our current understanding of carboxysomes in the context of their component protein domains with their inherent function as the 'building blocks' of carboxysomes...
October 2, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28933822/rod-like-virus-based-multiarm-colloidal-molecules
#3
Alexis de la Cotte, Cheng Wu, Marie Trévisan, Andrii Repula, Eric Grelet
We report on the construction of multiarm colloidal molecules by tip-linking filamentous bacteriophages, functionalized either by biological engineering or chemical conjugation. The affinity for streptavidin of a genetically modified vector phage displaying Strep-tags fused to one end of the viral particle, is measured by determining the dissociation constant, Kd. In order to both improve the colloidal stability and the efficiency of the self-assembly process, a biotinylation protocol having a chemical yield higher than 90% is presented to regio-selectively functionalize the cystein residues located at one end of the bacteriophages...
September 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28933617/genetic-engineering-applied-to-agriculture-has-a-long-row-to-hoe
#4
Henry I Miller
No abstract text is available yet for this article.
September 21, 2017: GM Crops & Food
https://www.readbyqxmd.com/read/28933359/a-prospective-treatment-option-for-lysosomal-storage-diseases-crispr-cas9-gene-editing-technology-for-mutation-correction-in-induced-pluripotent-stem-cells
#5
REVIEW
Chloe L Christensen, Francis Y M Choy
Ease of design, relatively low cost and a multitude of gene-altering capabilities have all led to the adoption of the sophisticated and yet simple gene editing system: clustered regularly interspaced short palindromic repeats/CRISPR-associated protein 9 (CRISPR/Cas9). The CRISPR/Cas9 system holds promise for the correction of deleterious mutations by taking advantage of the homology directed repair pathway and by supplying a correction template to the affected patient's cells. Currently, this technique is being applied in vitro in human-induced pluripotent stem cells (iPSCs) to correct a variety of severe genetic diseases, but has not as of yet been used in iPSCs derived from patients affected with a lysosomal storage disease (LSD)...
February 24, 2017: Diseases (Basel)
https://www.readbyqxmd.com/read/28932649/hepatocyte-transplantation-cell-sheet-technology-for-liver-cell-transplantation
#6
REVIEW
Kohei Tatsumi, Teruo Okano
PURPOSE OF REVIEW: We will review the recent developments of cell sheet technology as a feasible tissue engineering approach. Specifically, we will focus on the technological advancement for engineering functional liver tissue using cell sheet technology, and the associated therapeutic effect of cell sheets for liver diseases, highlighting hemophilia. RECENT FINDINGS: Cell-based therapies using hepatocytes have recently been explored as a new therapeutic modality for patients with many forms of liver disease...
2017: Current Transplantation Reports
https://www.readbyqxmd.com/read/28931757/vista-comp-an-engineered-checkpoint-receptor-agonist-that-potently-suppresses-t-cell-mediated-immune-responses
#7
Aaron Prodeus, Aws Abdul-Wahid, Amanda Sparkes, Nicholas W Fischer, Marzena Cydzik, Nicholas Chiang, Mays Alwash, Alessandra Ferzoco, Nathalie Vacaresse, Michael Julius, Reginald M Gorczysnki, Jean Gariépy
V-domain immunoglobulin suppressor of T cell activation (VISTA) is a recently discovered immune checkpoint ligand that functions to suppress T cell activity. The therapeutic potential of activating this immune checkpoint pathway to reduce inflammatory responses remains untapped, largely due to the inability to derive agonists targeting its unknown receptor. A dimeric construct of the IgV domain of VISTA (VISTA-Fc) was shown to suppress the activation of T cells in vitro. However, this effect required its immobilization on a solid surface, suggesting that VISTA-Fc may display limited efficacy as a VISTA-receptor agonist in vivo...
September 21, 2017: JCI Insight
https://www.readbyqxmd.com/read/28931639/trispecific-broadly-neutralizing-hiv-antibodies-mediate-potent-shiv-protection-in-macaques
#8
Ling Xu, Amarendra Pegu, Ercole Rao, Nicole Doria-Rose, Jochen Beninga, Krisha McKee, Dana M Lord, Ronnie R Wei, Gejing Deng, Mark Louder, Stephen D Schmidt, Zachary Mankoff, Lan Wu, Mangaiarkarasi Asokan, Christian Beil, Christian Lange, Wulf Dirk Leuschner, Jochen Kruip, Rebecca Sendak, Young Do Kwon, Tongqing Zhou, Xuejun Chen, Robert T Bailer, Keyun Wang, Misook Choe, Lawrence J Tartaglia, Dan H Barouch, Sijy O'Dell, John-Paul Todd, Dennis R Burton, Mario Roederer, Mark Connors, Richard A Koup, Peter D Kwong, Zhi-Yong Yang, John R Mascola, Gary J Nabel
The development of an effective AIDS vaccine has been challenging due to viral genetic diversity and the difficulty in generating broadly neutralizing antibodies (bnAbs). Here, we engineered trispecific antibodies (Abs) that allow a single molecule to interact with three independent HIV-1 envelope determinants: 1) the CD4 binding site, 2) the membrane proximal external region (MPER) and 3) the V1V2 glycan site. Trispecific Abs exhibited higher potency and breadth than any previously described single bnAb, showed pharmacokinetics similar to human bnAbs, and conferred complete immunity against a mixture of SHIVs in non-human primates (NHP) in contrast to single bnAbs...
September 20, 2017: Science
https://www.readbyqxmd.com/read/28931004/the-logic-of-the-floral-transition-reverse-engineering-the-switch-controlling-the-identity-of-lateral-organs
#9
Jean-Louis Dinh, Etienne Farcot, Charlie Hodgman
Much laboratory work has been carried out to determine the gene regulatory network (GRN) that results in plant cells becoming flowers instead of leaves. However, this also involves the spatial distribution of different cell types, and poses the question of whether alternative networks could produce the same set of observed results. This issue has been addressed here through a survey of the published intercellular distribution of expressed regulatory genes and techniques both developed and applied to Boolean network models...
September 20, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28930985/visualizing-angiogenesis-by-multiphoton-microscopy-in-vivo-in-genetically-modified-3d-plga-nhap-scaffold-for-calvarial-critical-bone-defect-repair
#10
Jian Li, Holger Jahr, Wei Zheng, Pei-Gen Ren
The reconstruction of critically sized bone defects remains a serious clinical problem because of poor angiogenesis within tissue-engineered scaffolds during repair, which gives rise to a lack of sufficient blood supply and causes necrosis of the new tissues. Rapid vascularization is a vital prerequisite for new tissue survival and integration with existing host tissue. The de novo generation of vasculature in scaffolds is one of the most important steps in making bone regeneration more efficient, allowing repairing tissue to grow into a scaffold...
September 7, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28930617/genetic-manipulation-of-microalgae-for-the-production-of-bioproducts
#11
Patricia Vazquez-Villegas, Mario A Torres-Acosta, Sergio A Garcia-Echauri, Jose M Aguilar-Yanez, Marco Rito-Palomares, Federico Ruiz-Ruiz
Microalgae have been used during the past four decades in the Bio-industries for the production of high added value products and development of useful approaches with environmental applications. The fast growing rate, simple growth requirements and using sunlight as the major source of energy are the key factors for usage of algae. In the past 15 years, a considerable progress has been made regarding the use of microalgae for production of proteins, nutraceuticals, food supplements, molecular tags for diagnostics and fixation of greenhouse gases...
January 1, 2018: Frontiers in Bioscience (Elite Edition)
https://www.readbyqxmd.com/read/28930528/biotechnological-improvement-of-nutritional-and-therapeutic-value-of-cultivated-potato
#12
Deepak Singh Bagri, Devanshi Chandel Upadhyay, Subodh Kumar Jain, Chandrama Prakash Upadhyay
Genetic engineering is recognized as a powerful tool for altering the genetic characteristic of crop plants. Genetic engineering has tremendous potential in developing improved potato varieties with desired agronomic traits and has been utilized for improvement of several crop plants including potato to enhance essential amino acid, protein and lipids/carbohydrates contents as well to improve stress tolerance. The pathway engineering of amino acid revealed dramatic changes in essential amino acid content and protein quality...
January 1, 2018: Frontiers in Bioscience (Scholar Edition)
https://www.readbyqxmd.com/read/28928909/transplanting-embryonic-stem-cells-onto-damaged-human-corneal-endothelium
#13
Charles Hanson, Arsaell Arnarsson, Thorir Hardarson, Ann Lindgård, Mandana Daneshvarnaeini, Catarina Ellerström, Anita Bruun, Ulf Stenevi
AIM: To investigate whether human embryonic stem cells (hESCs) could be made to attach, grow and differentiate on a human Descemet's membrane (DM). METHODS: Spontaneously differentiated hESCs were transferred onto a human corneal button with the endothelial layer removed using ocular sticks. The cells were cultured on a DM for up to 15 d. The genetically engineered hESC line expressed green fluorescent protein, which facilitated identification during the culture experiments, tissue preparation, and analysis...
August 26, 2017: World Journal of Stem Cells
https://www.readbyqxmd.com/read/28928460/molecular-dissection-of-transcriptional-reprogramming-of-steviol-glycosides-synthesis-in-leaf-tissue-during-developmental-phase-transitions-in-stevia-rebaudiana-bert
#14
Gopal Singh, Gagandeep Singh, Pradeep Singh, Rajni Parmar, Navgeet Paul, Radhika Vashist, Mohit Kumar Swarnkar, Ashok Kumar, Sanatsujat Singh, Anil Kumar Singh, Sanjay Kumar, Ram Kumar Sharma
Stevia is a natural source of commercially important steviol glycosides (SGs), which share biosynthesis route with gibberellic acids (GAs) through plastidal MEP and cytosolic MVA pathways. Ontogeny-dependent deviation in SGs biosynthesis is one of the key factor for global cultivation of Stevia, has not been studied at transcriptional level. To dissect underlying molecular mechanism, we followed a global transcriptome sequencing approach and generated more than 100 million reads. Annotation of 41,262 de novo assembled transcripts identified all the genes required for SGs and GAs biosynthesis...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28928126/chimeric-antigen-receptor-t-cell-therapies-for-multiple-myeloma
#15
Lekha Mikkilineni, James N Kochenderfer
Multiple myeloma (MM) is a nearly always incurable malignancy of plasma cells, so new approaches to treatment are needed. T-cell therapies are a promising approach for treating MM, with a mechanism of action different than those of standard MM treatments. Chimeric antigen receptors (CARs) are fusion proteins incorporating antigen-recognition domains and T-cell signaling domains. T-cells genetically engineered to express CARs can specifically recognize antigens. Success of CAR T-cells against leukemia and lymphoma has encouraged development of CAR T-cell therapies for MM...
September 19, 2017: Blood
https://www.readbyqxmd.com/read/28928052/directing-enzyme-devolution-for-biosynthesis-of-alkanols-and-1-n-alkanediols-from-natural-polyhydroxy-compounds
#16
Lu Dai, Fei Tao, Hongzhi Tang, Yali Guo, Yaling Shen, Ping Xu
Primordial enzymes are proposed to possess broad specificities. Through divergence and evolution, enzymes have been refined to exhibit specificity towards one reaction or substrate, and are thus commonly assumed as "specialists". However, several enzymes are "generalists" that catalyze a range of substrates and reactions. This property has been defined as enzyme promiscuity and is of great importance for the evolution of new functions. The promiscuities of two enzymes, namely glycerol dehydratase and diol dehydratase, were herein exploited for catalyzing long-chain polyols, including 1,2-butanediol, 1,2,4-butanetriol, erythritol, 1,2-pentanediol, 1,2,5-pentanetriol, and 1,2,6-hexanetriol...
September 16, 2017: Metabolic Engineering
https://www.readbyqxmd.com/read/28925994/chimeric-antigen-receptor-t-cell-therapy-assessment-and-management-of-toxicities
#17
REVIEW
Sattva S Neelapu, Sudhakar Tummala, Partow Kebriaei, William Wierda, Cristina Gutierrez, Frederick L Locke, Krishna V Komanduri, Yi Lin, Nitin Jain, Naval Daver, Jason Westin, Alison M Gulbis, Monica E Loghin, John F de Groot, Sherry Adkins, Suzanne E Davis, Katayoun Rezvani, Patrick Hwu, Elizabeth J Shpall
Immunotherapy using T cells genetically engineered to express a chimeric antigen receptor (CAR) is rapidly emerging as a promising new treatment for haematological and non-haematological malignancies. CAR-T-cell therapy can induce rapid and durable clinical responses, but is associated with unique acute toxicities, which can be severe or even fatal. Cytokine-release syndrome (CRS), the most commonly observed toxicity, can range in severity from low-grade constitutional symptoms to a high-grade syndrome associated with life-threatening multiorgan dysfunction; rarely, severe CRS can evolve into fulminant haemophagocytic lymphohistiocytosis (HLH)...
September 19, 2017: Nature Reviews. Clinical Oncology
https://www.readbyqxmd.com/read/28925932/chloroplast-genome-sequence-of-clusterbean-cyamopsis-tetragonoloba-l-genome-structure-and-comparative-analysis
#18
Tanvi Kaila, Pavan K Chaduvla, Hukam C Rawal, Swati Saxena, Anshika Tyagi, S V Amitha Mithra, Amolkumar U Solanke, Pritam Kalia, T R Sharma, N K Singh, Kishor Gaikwad
Clusterbean (Cyamopsis tetragonoloba L.), also known as guar, belongs to the family Leguminosae, and is an annual herbaceous legume. Guar is the main source of galactomannan for gas mining industries. In the present study, the draft chloroplast genome of clusterbean was generated and compared to some of the previously reported legume chloroplast genomes. The chloroplast genome of clusterbean is 152,530 bp in length, with a quadripartite structure consisting of large single copy (LSC) and small single copy (SSC) of 83,025 bp and 17,879 bp in size, respectively, and a pair of inverted repeats (IRs) of 25,790 bp in size...
September 19, 2017: Genes
https://www.readbyqxmd.com/read/28924475/pandemics-public-health-emergencies-and-antimicrobial-resistance-putting-the-threat-in-an-epidemiologic-and-risk-analysis-context
#19
C Raina MacIntyre, Chau Minh Bui
Public health messaging about antimicrobial resistance (AMR) sometimes conveys the problem as an epidemic. We outline why AMR is a serious endemic problem manifested in hospital and community-acquired infections. AMR is not an epidemic condition, but may complicate epidemics, which are characterised by sudden societal impact due to rapid rise in cases over a short timescale. Influenza, which causes direct viral effects, or secondary bacterial complications is the most likely cause of an epidemic or pandemic where AMR may be a problem...
2017: Archives of Public Health, Archives Belges de Santé Publique
https://www.readbyqxmd.com/read/28923688/expression-and-activity-analysis-of-%C3%AE-gallinacin-3-in-arabidopsis
#20
Libo Jin, Yunpeng Wang, Nuo Xu, Dezhong Wang, Xiuming Liu, Renyi Peng, Chao Jiang, Xiaokun Li
β Gallinacin-3 (β Gal-3) is an antimicrobial peptide with strong antibacterial activity against Escherichia coli, Staphylococcus aureus and Salmonella typhimurium. In this study, the β Gal-3 gene was transferred into a plant genome by genetic engineering techniques. These transgenic plants can be used as feed additives to prevent poultry diseases and them might replace the antibiotics used in poultry industry. To ensure the β Gal-3 expresses effectively in Arabidopsis seeds, the expression was driven by promoter Ppha cloned from the β-phaseolin storage protein gene...
September 16, 2017: Protein Expression and Purification
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