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https://www.readbyqxmd.com/read/28921815/low-gluten-non-transgenic-wheat-engineered-with-crispr-cas9
#1
Susana Sánchez-León, Javier Gil-Humanes, Carmen V Ozuna, María J Giménez, Carolina Sousa, Daniel F Voytas, Francisco Barro
Celiac disease is an autoimmune disorder triggered in genetically predisposed individuals by the ingestion of gluten proteins from wheat, barley, and rye. The -gliadin gene family of wheat contains four highly stimulatory peptides, of which the 33-mer is the main immunodominant peptide in celiac patients. We designed two sgRNAs to target a conserved region adjacent to the coding sequence for the 33-mer in the -gliadin genes. Twenty-one mutant lines were generated, all showing strong reduction in -gliadins. Up to 35 different genes were mutated in one of the lines of the 45 different genes identified in the wild type, while immunoreactivity was reduced by 85%...
September 18, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28914468/the-toxic-alpha-gliadin-peptide-31-43-enters-cells-without-a-surface-membrane-receptor
#2
Paolella Gaetana, Lepretti Marilena, Martucciello Stefania, Nanayakkara Merlin, Auricchio Salvatore, Esposito Carla, Barone Maria Vittoria, Caputo Ivana
Alpha-gliadin peptide 31-43 is considered to be the main peptide responsible for the innate immune response in celiac disease patients. Recent evidence indicates that peptide 31-43 rapidly enters cells and interacts with the early endocytic vesicular compartment. However, the mechanism of its uptake is not completely understood. Our aim is to characterize, isolate and identify possible cell surface proteins involved in peptide 31-43 internalization by Caco-2 cells. In this study, we used a chemical cross-linker to block peptide 31-43 on cell surface proteins, and pulled-down peptide-proteins complexes using antibodies raised against peptide 31-43...
September 15, 2017: Cell Biology International
https://www.readbyqxmd.com/read/28912827/development-of-taqman-probes-targeting-the-four-major-celiac-disease-epitopes-found-in-%C3%AE-gliadin-sequences-of-spelt-triticum-aestivum-ssp-spelta-and-bread-wheat-triticum-aestivum-ssp-aestivum
#3
Benjamin Dubois, Pierre Bertin, Yordan Muhovski, Emmanuelle Escarnot, Dominique Mingeot
BACKGROUND: Celiac disease (CD) is caused by specific sequences of gluten proteins found in cereals such as bread wheat (Triticum aestivum ssp. aestivum) and spelt (T. aestivum ssp. spelta). Among them, the α-gliadins display the highest immunogenicity, with four T-cell stimulatory epitopes. The toxicity of each epitope sequence can be reduced or even suppressed according to the allelic form of each sequence. One way to address the CD problem would be to make use of this allelic variability in breeding programs to develop safe varieties, but tools to track the presence of toxic epitopes are required...
2017: Plant Methods
https://www.readbyqxmd.com/read/28899487/discovery-cloning-and-characterisation-of-proline-specific-prolyl-endopeptidase-a-gluten-degrading-thermo-stable-enzyme-from-sphaerobacter-thermophiles
#4
Radhakrishna Shetty, Mike Vestergaard, Flemming Jessen, Per Hägglund, Verena Knorr, Peter Koehler, H S Prakash, Timothy John Hobley
Gluten free products have emerged during the last decades, as a result of a growing public concern and technological advancements allowing gluten reduction in food products. One approach is to use gluten degrading enzymes, typically at low or ambient temperatures, whereas many food production processes occur at elevated temperature. We present in this paper, the discovery, cloning and characterisation of a novel recombinant thermostable gluten degrading enzyme, a proline specific prolyl endoprotease (PEP) from Sphaerobacter thermophiles...
December 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28873661/effect-of-mild-thermal-treatment-on-the-polymerization-behavior-conformation-and-viscoelasticity-of-wheat-gliadin
#5
Pei Wang, Min Zou, Kexin Liu, Zhenxin Gu, Runqiang Yang
The physicochemical properties of gliadin upon mild thermal treatment were studied in terms of polymerization behavior, conformation and viscoelasticity. Gliadin samples were heated at 40, 60 and 90°C for up to 20min. Results showed that α-gliadin started to polymerize via disulfide (SS) bonds before γ-gliadin at 90°C, resulting in the extractability loss in aqueous ethanol. β-Turn and specific β-sheet structures were partially conversed to α-helices during thermal treatment. Rearrangement of non-covalent forces might contribute to viscosity loss of gliadin at 40 and 60°C...
January 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28873623/waxy-flour-degradation-impact-of-screw-geometry-and-specific-mechanical-energy-in-a-co-rotating-twin-screw-extruder
#6
Ryan J Kowalski, Jacob P Hause, Helen Joyner Melito, Girish M Ganjyal
Dextrinization of starch using extrusion processing is crucial to the quality of direct expanded products. To determine the extent of dextrinization, flour samples were extracted from a twin-screw extruder that had been brought to a sudden stop and molecular weights were determined by intrinsic viscosity. The screw profile and moisture feed content had the most significant impact on molecular weight reduction, reducing intrinsic viscosity from 1.75 to 0.70dL/g at the most. The breakdown, as shown by a reduction in intrinsic viscosity, had a strong negative correlation (r=-0...
January 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28871457/protective-effect-of-1-25-dihydroxy-vitamin-d3-on-pepsin-trypsin-resistant-gliadin-induced-tight-junction-injuries
#7
Shouquan Dong, Tikka Prabhjot Singh, Xin Wei, Huang Yao, Hongling Wang
BACKGROUND: Tight junction (TJ) injuries induced by pepsin-trypsin-resistant gliadin (PT-G) play an important role in the pathogenesis of celiac disease. Previously, 1,25-dihydroxy vitamin D3 (VD3) was reported to be a TJ regulator that attenuates lipopolysaccharide- and alcohol-induced TJ injuries. However, whether VD3 can attenuate PT-G-induced TJ injuries is unknown. AIM: The aim of this study was to evaluate the effects of VD3 on PT-G-induced TJ injuries. METHODS: Caco-2 monolayers were used as in vitro models...
September 4, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/28857322/new-insights-into-structural-organization-and-gene-duplication-in-a-1-75-mb-genomic-region-harboring-the-%C3%AE-gliadin-gene-family-in-aegilops-tauschii-the-source-of-wheat-d-genome
#8
Naxin Huo, Lingli Dong, Shengli Zhang, Yi Wang, Tingting Zhu, Toni Mohr, Susan Altenbach, Zhiyong Liu, Jan Dvorak, Olin D Anderson, Ming-Cheng Luo, Daowen Wang, Yong Q Gu
Among the wheat prolamins important for its end-use traits, α-gliadins are the most abundant and also a major cause of food-related allergies and intolerances. Previous studies of various wheat species estimated between 25 to 150 α-gliadin genes reside in the Gli-2 locus regions. To better understand the evolution of this complex gene family, the DNA sequence of a 1.75-Mb genomic region spanning the Gli-2 locus was analyzed in the diploid grass, Aegilops tauschii, the ancestral source of D genome in hexaploid bread wheat...
August 30, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28839442/gut-barrier-failure-biomarkers-are-associated-with-poor-disease-outcome-in-patients-with-primary-sclerosing-cholangitis
#9
Tamas Tornai, Eszter Palyu, Zsuzsanna Vitalis, Istvan Tornai, David Tornai, Peter Antal-Szalmas, Gary L Norman, Zakera Shums, Gabor Veres, Antal Dezsofi, Gabriella Par, Alajos Par, Peter Orosz, Ferenc Szalay, Peter Laszlo Lakatos, Maria Papp
AIM: To assess the prevalence of a panel of serologic markers that reflect gut barrier dysfunction in a mixed cohort of pediatric and adult primary sclerosing cholangitis (PSC) patients. METHODS: Sera of 67 PSC patients [median age (range): 32 (5-79) years, concomitant IBD: 67% and cirrhosis: 20%] were assayed for the presence of antibodies against to F-actin (AAA IgA/IgG) and gliadin (AGA IgA/IgG)] and for serum level of intestinal fatty acid-binding protein (I-FABP) by ELISA...
August 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28819077/-gluten-ataxia-anti-transglutaminase-6-antibody-as-a-new-biomarker
#10
Kenji Sato, Kazunori Nanri
Gluten-related disorders (GRDs) are conditions that develop in response to the common trigger of gluten ingestion and manifest as a variety of clinical symptoms. GRDs have been considered rare in Asian countries, including Japan, because of lower consumption of wheat products than in Europe and the U.S.A. and differences in genetic background. Recently, however, GRDs, such as celiac disease and gluten ataxia, have been reported in Japan, albeit sporadically and their presence is now recognized in this country...
August 2017: Brain and Nerve, Shinkei Kenkyū No Shinpo
https://www.readbyqxmd.com/read/28809572/antigen-specific-gut-inflammation-and-systemic-immune-responses-induced-by-prolonging-wheat-gluten-sensitization-in-balb-c-murine-model
#11
M Vijaykrishnaraj, B V Mohan Kumar, S P Muthukumar, Nawneet K Kurrey, P Prabhasankar
Gluten-related diseases such as wheat allergy, celiac disease, and gluten intolerance are widespread around the globe to genetically predisposed individuals. The present study aims to develop a wheat-gluten induced BALB/c murine model for addressing wheat-gluten related disorders by sensitizing the wheat gluten through the route of intraperitoneal and oral challenge in prolonged days. During the sensitization, the sera were collected for specific antigliadin antibodies response and proinflammatory markers quantification...
September 11, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28798921/screening-of-celiac-disease-in-down-syndrome-old-and-new-dilemmas
#12
REVIEW
Momcilo Pavlovic, Karolina Berenji, Marko Bukurov
Celiac disease (CD) is a common and well defined autoimmune disorder caused by gliadin and related proteins of wheat, rye, and barley. Epidemiologic studies confirmed that CD is highly associated with other autoimmune diseases and with Down syndrome (DS). The symptomatic form of CD in patients with DS is more frequent than asymptomatic forms. However, growth impairment, anemia, intermittent diarrhea, and constipation are symptoms and signs typically of children with DS without CD. Late identification of the disease can lead to various complications, sometimes even very severe...
July 16, 2017: World Journal of Clinical Cases
https://www.readbyqxmd.com/read/28797308/coeliac-disease-in-infants-antibodies-to-deamidated-gliadin-peptide-come-first
#13
Michele Arigliani, Francesca Rech Morassutti, Martina Fabris, Paola Melli, Elio Tonutti, Paola Cogo
BACKGROUND: The onset of coeliac disease (CD) in the first year of life is uncommon and the diagnosis can be challenging due to the suboptimal sensitivity of tissue transglutaminase antibodies (tTG) at this age and the many other possible causes of malabsorption in infants. Antibodies to deamidated gliadin peptides (anti-DGPs), especially IgG, may appear earlier than IgA anti-tTG in very young children with CD. CASE PRESENTATION: We report here on an 8-month-old child who was evaluated for failure to thrive, constipation and developmental delay...
August 10, 2017: Italian Journal of Pediatrics
https://www.readbyqxmd.com/read/28771001/abrogation-of-immunogenic-properties-of-gliadin-peptides-through-transamidation-by-microbial-transglutaminase-is-acyl-acceptor-dependent
#14
Lin Zhou, Yvonne M C Kooy-Winkelaar, Robert A Cordfunke, Irina Dragan, Allan Thompson, Jan Wouter Drijfhout, Peter A van Veelen, Hongbing Chen, Frits Koning
Wheat gluten confers superior baking quality to wheat based products but elicits a pro-inflammatory immune response in patients with celiac disease. Transamidation of gluten by microbial transglutaminase (mTG) and tissue transglutaminase (tTG) reduces the immunogenicity of gluten; however, little information is available on the minimal modification sufficient to eliminate gliadin immunogenicity nor has the effectiveness of transamidation been studied with T-cell clones from patients. Here we demonstrate that mTG can efficiently couple three different acyl-acceptor molecules, l-lysine, glycine ethyl ester, and hydroxylamine, to gliadin peptides and protein...
August 30, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28769550/differences-in-gluten-protein-composition-between-old-and-modern-durum-wheat-genotypes-in-relation-to-20th-century-breeding-in-italy
#15
Michele A De Santis, Marcella M Giuliani, Luigia Giuzio, Pasquale De Vita, Alison Lovegrove, Peter R Shewry, Zina Flagella
The impact of breeding on grain yields of wheat varieties released during the 20th century has been extensively studied, whereas less information is available on the changes in gluten quality associated with effects on the amount and composition of glutenins and gliadins. In order to explore the effects of breeding during the 20th century on gluten quality of durum wheat for processing and health we have compared a set of old and modern Italian genotypes grown under Mediterranean conditions. The better technological performance observed for the modern varieties was found to be due not only to the introgression of superior alleles of high (HMW-GS) and low molecular weight (LMW-GS) glutenin subunits encoded at Glu-B1 and Glu-B3 loci, but also to differential expression of specific storage proteins...
July 2017: European Journal of Agronomy: the Journal of the European Society for Agronomy
https://www.readbyqxmd.com/read/28764003/fundamental-study-on-reactivities-of-gluten-protein-types-from-wheat-rye-and-barley-with-five-sandwich-elisa-test-kits
#16
Barbara Lexhaller, Christine Tompos, Katharina Anne Scherf
Monitoring the compliance of gluten-free foods to the regulatory threshold of 20mg/kg of gluten is essential for celiac disease patients. The different enzyme-linked immunosorbent assays (ELISAs) for gluten detection each have specific characteristics, but there are only a few systematic comparisons. This fundamental study compared the specificities and sensitivities of the R5, G12 and Skerritt monoclonal and two polyclonal antibodies to well-defined gluten protein types (GPT) isolated from wheat, rye and barley flours...
December 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28759621/identification-of-novel-antibody-reactive-detection-sites-for-comprehensive-gluten-monitoring
#17
Niels Röckendorf, Barbara Meckelein, Katharina A Scherf, Kathrin Schalk, Peter Koehler, Andreas Frey
Certain cereals like wheat, rye or barley contain gluten, a protein mixture that can trigger celiac disease (CD). To make gluten-free diets available for affected individuals the gluten content of foodstuff must be monitored. For this purpose, antibody-based assays exist which rely on the recognition of certain linear gluten sequence motifs. Yet, not all CD-active gluten constituents and fragments formed during food processing/fermentation may be covered by those tests. In this study, we therefore assayed the coverage of reportedly CD-active gluten components by currently available detection antibodies and determined the antibody-inducing capacity of wheat gluten constituents in order to provide novel diagnostic targets for comprehensive gluten quantitation...
2017: PloS One
https://www.readbyqxmd.com/read/28750860/impaired-barrier-function-and-autoantibody-generation-in-malnutrition-enteropathy-in-zambia
#18
Beatrice Amadi, Ellen Besa, Kanekwa Zyambo, Patrick Kaonga, John Louis-Auguste, Kanta Chandwe, Phillip I Tarr, Donna M Denno, James P Nataro, William Faubion, Anne Sailer, Sunil Yeruva, Tricia Brantner, Joseph Murray, Andrew J Prendergast, Jerrold R Turner, Paul Kelly
Intestinal damage in malnutrition constitutes a threat to the survival of many thousands of children globally. We studied children in Lusaka, Zambia, with severe acute malnutrition (SAM) and persistent diarrhea using endoscopy, biopsy and analysis of markers and protective proteins in blood and intestinal secretions. We carried out parallel investigations in apparently healthy adults, and analyzed biomarkers only in apparently healthy children. Villus height and crypt depth did not differ in children with SAM and adult controls, but epithelial surface was reduced in children with SAM (median 445, interquartile range (IQR) 388, 562μm per 100μm muscularis mucosae) compared to adults (578, IQR 465,709; P=0...
August 2017: EBioMedicine
https://www.readbyqxmd.com/read/28737923/cosilencing-intestinal-transglutaminase-2-and-interleukin-15-using-gelatin-based-nanoparticles-in-an-in-vitro-model-of-celiac-disease
#19
Husain Attarwala, Valerie Clausen, Prasoon Chaturvedi, Mansoor M Amiji
In this study, we have developed a type B gelatin nanoparticle based siRNA delivery system for silencing of intestinal transglutaminase-2 (TG2) and interleukin-15 (IL-15) genes in cultured human intestinal epithelial cells (Caco-2) and murine alveolar macrophage cells (J774A.1). Small interfering RNA (siRNA) targeting the TG2 or IL-15 gene was encapsulated within gelatin nanoparticles using ethanol-water solvent displacement method. Size, charge, and morphology of gelatin nanoparticles were evaluated using a Zetasizer instrument and transmission electron microscopy...
August 10, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28722361/-food-dependent-exercise-induced-anaphylaxis-a-stepwise-diagnosis
#20
Julien Gaillard, Amélie Borgeat-Kaeser, Guillaume Buss, François Spertini
Food-dependent exercise-induced anaphylaxis (FDEIA) is a potentially severe food allergy. Physical exercise, NSAID, alcohol, infectious diseases and estrogens are recognized cofactors, able to reduce the amount of allergen needed to achieve a threshold for the induction of anaphylaxis. Various kinds of causative food but only a few responsible proteins have been identified. The best known is wheat ω5-gliadine. An oral food challenge remains the gold standard to prove the diagnosis. Its clinical application remains difficult and includes an allergen challenge, a cofactor challenge and a third step which integrates both of them in a single test...
April 5, 2017: Revue Médicale Suisse
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