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Marín-Sanz M, Barro F, Sánchez-León S. Unraveling the celiac disease-related immunogenic complexes in a set of wheat and tritordeum genotypes: implications for low-gluten precision breeding in cereal crops. Front Plant Sci 2023; 14:1171882. [PMID: 37251754 PMCID: PMC10210591 DOI: 10.3389/fpls.2023.1171882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 04/06/2023] [Indexed: 05/31/2023]
Abstract
The development of low-gluten immunogenic cereal varieties is a suitable way to fight the increment of pathologies associated with the consumption of cereals. Although RNAi and CRISPR/Cas technologies were effective in providing low-gluten wheat, the regulatory framework, particularly in the European Union, is an obstacle to the short- or medium-term implementation of such lines. In the present work, we carried out a high throughput amplicon sequencing of two highly immunogenic complexes of wheat gliadins in a set of bread and durum wheat, and tritordeum genotypes. Bread wheat genotypes harboring the 1BL/1RS translocation were included in the analysis and their amplicons successfully identified. The number of CD epitopes and their abundances were determined in the alpha- and gamma-gliadin amplicons, including 40k-γ-secalin ones. Bread wheat genotypes not containing the 1BL/1RS translocation showed a higher average number of both alpha- and gamma-gliadin epitopes than those containing such translocation. Interestingly, alpha-gliadin amplicons not containing CD epitopes accounted for the highest abundance (around 53%), and the alpha- and gamma-gliadin amplicons with the highest number of epitopes were present in the D-subgenome. The durum wheat and tritordeum genotypes showed the lowest number of alpha- and gamma-gliadin CD epitopes. Our results allow progress in unraveling the immunogenic complexes of alpha- and gamma-gliadins and can contribute to the development of low-immunogenic varieties within precision breeding programs, by crossing or by CRISPR/Cas gene editing.
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Marín-Sanz M, Sánchez-León S, León E, Barro F. Comparative characterization of the gluten and fructan contents of breads from industrial and artisan bakeries: a study of food products in the Spanish market. Food Nutr Res 2022; 66:8472. [PMID: 35757438 PMCID: PMC9199834 DOI: 10.29219/fnr.v66.8472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 04/06/2022] [Accepted: 04/07/2022] [Indexed: 12/16/2022] Open
Abstract
Background The consumption of wheat/gluten is associated with adverse reactions for human health. Gluten and fructans are identified as the major compounds triggering and worsening adverse reactions to wheat, which are increasing, and as a consequence, avoidance of gluten/wheat is the common strategy of many individuals of the western population. Although bread is a product of daily consumption, there is a lack of information on the gluten and fructan contents and the influence of artisanal or industrial processes. Objective The aim of this study is to carry out a comparative characterization between artisan bakeries and hypermarkets in Spain for gluten and fructan contents in daily sold breads. Design A total of 48 types of bread highly consumed in Spain sold in artisan bakeries (long fermentation) and hypermarkets (short fermentations) were selected for comparing the gluten and fructan contents. Methods such as reverse phase-high performance liquid chromatography (RP-HPLC), R5 monoclonal antibody (moAb), and fructans protocols were used for the quantification of these compounds. Results Great variation for the content of gluten and fructans has been found between all bread categories. Although breads produced using long fermentation (artisan bakeries) contain significantly lower gluten, they have higher fructans than those using short fermentations (hypermarkets). Durum wheat breads had the lowest content of gluten. Moreover, spelt breads from artisan bakeries had the lowest content of fructans but not those from hypermarkets. Discussion In this study, we report the comparative characterizarion of the breads of the Spanish market. These food products presented variation in the amount of gluten and fructans, ligated in most of the cases to the nature of the providers: artisan bakeries against hypermarkets. Depending on the type of bread, the differences for the daily consumption of gluten and fructan can be 4.5 and 20 times, respectively. Conclusions We found strong differences for gluten and fructan contents among breads. These information may contribute to designing strategies to improve the management of gluten and fructans in bread.
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Affiliation(s)
- Miriam Marín-Sanz
- Department of Plant Breeding, Institute of Sustainable Agriculture (IAS), Spanish Council for Scientific Research (CSIC), Córdoba, Spain
| | - Susana Sánchez-León
- Department of Plant Breeding, Institute of Sustainable Agriculture (IAS), Spanish Council for Scientific Research (CSIC), Córdoba, Spain
| | | | - Francisco Barro
- Department of Plant Breeding, Institute of Sustainable Agriculture (IAS), Spanish Council for Scientific Research (CSIC), Córdoba, Spain
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Haro C, Guzmán-López MH, Marín-Sanz M, Sánchez-León S, Vaquero L, Pastor J, Comino I, Sousa C, Vivas S, Landa BB, Barro F. Consumption of Tritordeum Bread Reduces Immunogenic Gluten Intake without Altering the Gut Microbiota. Foods 2022; 11:foods11101439. [PMID: 35627010 PMCID: PMC9142130 DOI: 10.3390/foods11101439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 05/13/2022] [Accepted: 05/15/2022] [Indexed: 12/04/2022] Open
Abstract
Gluten proteins are responsible for the wheat breadmaking quality. However, gluten is also related to human pathologies for which the only treatment is a gluten-free diet (GFD). GFD has gained popularity among individuals who want to reduce their gluten intake. Tritordeum is a cereal species that originated after crossing durum wheat with wild barley and differs from bread wheat in its gluten composition. In this work, we have characterized the immunogenic epitopes of tritordeum bread and results from a four-phase study with healthy adults for preferences of bread and alterations in the gut microbiota after consuming wheat bread, gluten-free bread, and tritordeum bread are reported. Tritordeum presented fewer peptides related to gluten proteins, CD-epitopes, and IgE binding sites than bread wheat. Participants rated tritordeum bread higher than gluten-free bread. Gut microbiota analysis revealed that the adherence to a strict GFD involves some minor changes, especially altering the species producing short-chain fatty acids. However, the short-term consumption of tritordeum bread does not induce significant changes in the diversity or community composition of the intestinal microbiota in healthy individuals. Therefore, tritordeum bread could be an alternative for healthy individuals without wheat-related pathologies who want to reduce their gluten consumption without harming their gut health.
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Affiliation(s)
- Carmen Haro
- Department of Crop Protection, Institute for Sustainable Agriculture—Spanish National Research Council (IAS—CSIC), 14004 Córdoba, Spain; (C.H.); (B.B.L.)
| | - María H. Guzmán-López
- Department of Plant Breeding, Institute for Sustainable Agriculture—Spanish National Research Council (IAS—CSIC), 14004 Córdoba, Spain; (M.M.-S.); (S.S.-L.)
- Correspondence: (M.H.G.-L.); (F.B.)
| | - Miriam Marín-Sanz
- Department of Plant Breeding, Institute for Sustainable Agriculture—Spanish National Research Council (IAS—CSIC), 14004 Córdoba, Spain; (M.M.-S.); (S.S.-L.)
| | - Susana Sánchez-León
- Department of Plant Breeding, Institute for Sustainable Agriculture—Spanish National Research Council (IAS—CSIC), 14004 Córdoba, Spain; (M.M.-S.); (S.S.-L.)
| | - Luis Vaquero
- Department of Gastroenterology, Hospital of León, Biomedicine Institute, University of León, 24071 León, Spain; (L.V.); (S.V.)
| | - Jorge Pastor
- Novapan, S.L., C/Chopo, 68-70, 50171 La Puebla de Alfinden, Spain;
| | - Isabel Comino
- Department of Microbiology and Parasitology, Pharmacy Faculty, University of Seville, 41004 Seville, Spain; (I.C.); (C.S.)
| | - Carolina Sousa
- Department of Microbiology and Parasitology, Pharmacy Faculty, University of Seville, 41004 Seville, Spain; (I.C.); (C.S.)
| | - Santiago Vivas
- Department of Gastroenterology, Hospital of León, Biomedicine Institute, University of León, 24071 León, Spain; (L.V.); (S.V.)
| | - Blanca B. Landa
- Department of Crop Protection, Institute for Sustainable Agriculture—Spanish National Research Council (IAS—CSIC), 14004 Córdoba, Spain; (C.H.); (B.B.L.)
| | - Francisco Barro
- Department of Plant Breeding, Institute for Sustainable Agriculture—Spanish National Research Council (IAS—CSIC), 14004 Córdoba, Spain; (M.M.-S.); (S.S.-L.)
- Correspondence: (M.H.G.-L.); (F.B.)
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Guzmán-López MH, Sánchez-León S, Marín-Sanz M, Comino I, Segura V, Vaquero L, Rivero-Lezcano OM, Pastor J, Sousa C, Vivas S, Barro F. Oral Consumption of Bread from an RNAi Wheat Line with Strongly Silenced Gliadins Elicits No Immunogenic Response in a Pilot Study with Celiac Disease Patients. Nutrients 2021; 13:nu13124548. [PMID: 34960101 PMCID: PMC8708050 DOI: 10.3390/nu13124548] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 12/15/2021] [Accepted: 12/16/2021] [Indexed: 02/07/2023] Open
Abstract
Celiac disease (CD) is a genetically predisposed, T cell-mediated and autoimmune-like disorder caused by dietary exposure to the storage proteins of wheat and related cereals. A gluten-free diet (GFD) is the only treatment available for CD. The celiac immune response mediated by CD4+ T-cells can be assessed with a short-term oral gluten challenge. This study aimed to determine whether the consumption of bread made using flour from a low-gluten RNAi wheat line (named E82) can activate the immune response in DQ2.5-positive patients with CD after a blind crossover challenge. The experimental protocol included assessing IFN-γ production by peripheral blood mononuclear cells (PBMCs), evaluating gastrointestinal symptoms, and measuring gluten immunogenic peptides (GIP) in stool samples. The response of PBMCs was not significant to gliadin and the 33-mer peptide after E82 bread consumption. In contrast, PBMCs reacted significantly to Standard bread. This lack of immune response is correlated with the fact that, after E82 bread consumption, stool samples from patients with CD showed very low levels of GIP, and the symptoms were comparable to those of the GFD. This pilot study provides evidence that bread from RNAi E82 flour does not elicit an immune response after a short-term oral challenge and could help manage GFD in patients with CD.
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Affiliation(s)
- María H. Guzmán-López
- Department of Plant Breeding, Institute for Sustainable Agriculture—Spanish National Research Council (IAS-CSIC), 14004 Córdoba, Spain; (M.H.G.-L.); (S.S.-L.); (M.M.-S.)
| | - Susana Sánchez-León
- Department of Plant Breeding, Institute for Sustainable Agriculture—Spanish National Research Council (IAS-CSIC), 14004 Córdoba, Spain; (M.H.G.-L.); (S.S.-L.); (M.M.-S.)
| | - Miriam Marín-Sanz
- Department of Plant Breeding, Institute for Sustainable Agriculture—Spanish National Research Council (IAS-CSIC), 14004 Córdoba, Spain; (M.H.G.-L.); (S.S.-L.); (M.M.-S.)
| | - Isabel Comino
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Seville, 41012 Sevilla, Spain; (I.C.); (V.S.); (C.S.)
| | - Verónica Segura
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Seville, 41012 Sevilla, Spain; (I.C.); (V.S.); (C.S.)
| | - Luis Vaquero
- Department of Gastroenterology, University Hospital of León, University of León, 24071 León, Spain; (L.V.); (S.V.)
| | | | - Jorge Pastor
- Novapan, S.L., C/Chopo, 68-70, La Puebla de Alfindén, 50171 Zaragoza, Spain;
| | - Carolina Sousa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Seville, 41012 Sevilla, Spain; (I.C.); (V.S.); (C.S.)
| | - Santiago Vivas
- Department of Gastroenterology, University Hospital of León, University of León, 24071 León, Spain; (L.V.); (S.V.)
| | - Francisco Barro
- Department of Plant Breeding, Institute for Sustainable Agriculture—Spanish National Research Council (IAS-CSIC), 14004 Córdoba, Spain; (M.H.G.-L.); (S.S.-L.); (M.M.-S.)
- Correspondence:
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Guzmán-López MH, Marín-Sanz M, Sánchez-León S, Barro F. A Bioinformatic Workflow for InDel Analysis in the Wheat Multi-Copy α-Gliadin Gene Family Engineered with CRISPR/Cas9. Int J Mol Sci 2021; 22:13076. [PMID: 34884880 PMCID: PMC8657701 DOI: 10.3390/ijms222313076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 11/24/2021] [Accepted: 12/01/2021] [Indexed: 11/16/2022] Open
Abstract
The α-gliadins of wheat, along with other gluten components, are responsible for bread viscoelastic properties. However, they are also related to human pathologies as celiac disease or non-celiac wheat sensitivity. CRISPR/Cas was successfully used to knockout α-gliadin genes in bread and durum wheat, therefore, obtaining low gluten wheat lines. Nevertheless, the mutation analysis of these genes is complex as they present multiple and high homology copies arranged in tandem in A, B, and D subgenomes. In this work, we present a bioinformatic pipeline based on NGS amplicon sequencing for the analysis of insertions and deletions (InDels) in α-gliadin genes targeted with two single guides RNA (sgRNA). This approach allows the identification of mutated amplicons and the analysis of InDels through comparison to the most similar wild type parental sequence. TMM normalization was performed for inter-sample comparisons; being able to study the abundance of each InDel throughout generations and observe the effects of the segregation of Cas9 coding sequence in different lines. The usefulness of the workflow is relevant to identify possible genomic rearrangements such as large deletions due to Cas9 cleavage activity. This pipeline enables a fast characterization of mutations in multiple samples for a multi-copy gene family.
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Affiliation(s)
| | | | | | - Francisco Barro
- Department of Plant Breeding, Institute for Sustainable Agriculture-Spanish National Research Council (IAS-CSIC), 14004 Córdoba, Spain; (M.H.G.-L.); (M.M.-S.); (S.S.-L.)
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Renard J, Martínez-Almonacid I, Queralta Castillo I, Sonntag A, Hashim A, Bissoli G, Campos L, Muñoz-Bertomeu J, Niñoles R, Roach T, Sánchez-León S, Ozuna CV, Gadea J, Lisón P, Kranner I, Barro F, Serrano R, Molina I, Bueso E. Apoplastic lipid barriers regulated by conserved homeobox transcription factors extend seed longevity in multiple plant species. New Phytol 2021; 231:679-694. [PMID: 33864680 DOI: 10.1111/nph.17399] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 03/31/2021] [Indexed: 06/12/2023]
Abstract
Cutin and suberin are lipid polyesters deposited in specific apoplastic compartments. Their fundamental roles in plant biology include controlling the movement of gases, water and solutes, and conferring pathogen resistance. Both cutin and suberin have been shown to be present in the Arabidopsis seed coat where they regulate seed dormancy and longevity. In this study, we use accelerated and natural ageing seed assays, glutathione redox potential measures, optical and transmission electron microscopy and gas chromatography-mass spectrometry to demonstrate that increasing the accumulation of lipid polyesters in the seed coat is the mechanism by which the AtHB25 transcription factor regulates seed permeability and longevity. Chromatin immunoprecipitation during seed maturation revealed that the lipid polyester biosynthetic gene long-chain acyl-CoA synthetase 2 (LACS2) is a direct AtHB25 binding target. Gene transfer of this transcription factor to wheat and tomato demonstrated the importance of apoplastic lipid polyesters for the maintenance of seed viability. Our work establishes AtHB25 as a trans-species regulator of seed longevity and has identified the deposition of apoplastic lipid barriers as a key parameter to improve seed longevity in multiple plant species.
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Affiliation(s)
- Joan Renard
- Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Camino de Vera, Valencia, 46022, Spain
| | - Irene Martínez-Almonacid
- Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Camino de Vera, Valencia, 46022, Spain
| | - Indira Queralta Castillo
- Department of Biology, Algoma University, 1520 Queen Street East, Sault Ste Marie, ON, P6A 2G4, Canada
| | - Annika Sonntag
- Department of Biology, Algoma University, 1520 Queen Street East, Sault Ste Marie, ON, P6A 2G4, Canada
| | - Aseel Hashim
- Department of Biology, Algoma University, 1520 Queen Street East, Sault Ste Marie, ON, P6A 2G4, Canada
| | - Gaetano Bissoli
- Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Camino de Vera, Valencia, 46022, Spain
| | - Laura Campos
- Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Camino de Vera, Valencia, 46022, Spain
| | - Jesús Muñoz-Bertomeu
- Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Camino de Vera, Valencia, 46022, Spain
| | - Regina Niñoles
- Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Camino de Vera, Valencia, 46022, Spain
| | - Thomas Roach
- Institute of Botany, Functional Plant Biology, University of Innsbruck, Innsbruck, A-6020, Austria
| | - Susana Sánchez-León
- Department of Plant Breeding, Institute for Sustainable Agriculture (IAS-CSIC), Córdoba, 14004, Spain
| | - Carmen V Ozuna
- Department of Plant Breeding, Institute for Sustainable Agriculture (IAS-CSIC), Córdoba, 14004, Spain
| | - José Gadea
- Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Camino de Vera, Valencia, 46022, Spain
| | - Purificación Lisón
- Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Camino de Vera, Valencia, 46022, Spain
| | - Ilse Kranner
- Institute of Botany, Functional Plant Biology, University of Innsbruck, Innsbruck, A-6020, Austria
| | - Francisco Barro
- Department of Plant Breeding, Institute for Sustainable Agriculture (IAS-CSIC), Córdoba, 14004, Spain
| | - Ramón Serrano
- Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Camino de Vera, Valencia, 46022, Spain
| | - Isabel Molina
- Department of Biology, Algoma University, 1520 Queen Street East, Sault Ste Marie, ON, P6A 2G4, Canada
| | - Eduardo Bueso
- Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Camino de Vera, Valencia, 46022, Spain
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Sánchez-León S, Haro C, Villatoro M, Vaquero L, Comino I, González-Amigo AB, Vivas S, Pastor J, Sousa C, Landa BB, Barro F. Tritordeum breads are well tolerated with preference over gluten-free breads in non-celiac wheat-sensitive patients and its consumption induce changes in gut bacteria. J Sci Food Agric 2021; 101:3508-3517. [PMID: 33275797 DOI: 10.1002/jsfa.10982] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 09/29/2020] [Accepted: 12/04/2020] [Indexed: 05/24/2023]
Abstract
BACKGROUND The ingestion of wheat and other cereals are related to several gut disorders. The specific components responsible for non-celiac wheat-sensitivity (NCWS) may include gluten and other compounds. Tritordeum is a new cereal derived from crossing durum wheat with a wild barley species, which differs from bread wheat in its gluten composition. In the present work, we examined the response of NCWS patients to tritordeum bread Gastrointestinal symptoms as well as tritordeum acceptability, gluten immunogenic peptides excretion, and the composition and structure of the intestinal microbiota were evaluated. RESULTS Gastrointestinal symptoms of the subjects showed no significant change between the gluten-free bread and the tritordeum bread. Participating subjects rated tritordeum bread higher than the gluten-free bread. Analysis of the bacterial gut microbiota indicated that tritordeum consumption does not alter the global structure and composition of the intestinal microbiota, and only a few changes in some butyrate-producing bacteria were observed. CONCLUSIONS All the results derived from acceptability, biochemical and microbiological tests suggest that tritordeum may be tolerated by a sub-set of NCWS sufferers who do not require strict exclusion of gluten from their diet. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Susana Sánchez-León
- Departamento de Mejora Genética Vegetal, Instituto de Agricultura Sostenible (IAS-CSIC), Córdoba, Spain
| | - Carmen Haro
- Departamento de Protección de Cultivos, Instituto de Agricultura Sostenible (IAS-CSIC), Córdoba, Spain
| | - Myriam Villatoro
- Departamento de Mejora Genética Vegetal, Instituto de Agricultura Sostenible (IAS-CSIC), Córdoba, Spain
| | - Luis Vaquero
- Departamento de Gastroenterología, Hospital Universitario de León, Instituto de Biomedicina, Universidad de León, León, Spain
| | - Isabel Comino
- Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad de Sevilla, Sevilla, Spain
| | - Ana B González-Amigo
- Departamento de Gastroenterología, Hospital Universitario de León, Instituto de Biomedicina, Universidad de León, León, Spain
| | - Santiago Vivas
- Departamento de Gastroenterología, Hospital Universitario de León, Instituto de Biomedicina, Universidad de León, León, Spain
| | - Jorge Pastor
- Novapan, S.L., La Puebla de Alfinden, Zaragoza, Spain
| | - Carolina Sousa
- Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad de Sevilla, Sevilla, Spain
| | - Blanca B Landa
- Departamento de Protección de Cultivos, Instituto de Agricultura Sostenible (IAS-CSIC), Córdoba, Spain
| | - Francisco Barro
- Departamento de Mejora Genética Vegetal, Instituto de Agricultura Sostenible (IAS-CSIC), Córdoba, Spain
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Sánchez-León S, Giménez MJ, Barro F. The α-Gliadins in Bread Wheat: Effect of Nitrogen Treatment on the Expression of the Major Celiac Disease Immunogenic Complex in Two RNAi Low-Gliadin Lines. Front Plant Sci 2021; 12:663653. [PMID: 33995459 PMCID: PMC8116895 DOI: 10.3389/fpls.2021.663653] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 04/06/2021] [Indexed: 06/01/2023]
Abstract
Celiac Disease (CD) is an autoimmune disorder that affects approximately 1% of the worldwide population. The α-gliadins of wheat contain the 33-mer peptide, the most active peptide in CD both in adults and pediatric patients. In this study, we have characterized the variants and expression profile of an α-gliadins amplicon, harboring the 33-mer peptide, in two low-gliadin RNAi wheat lines, under two different Nitrogen (N) treatments. We estimated that the amplicon expands 45 different α-gliadin variants with high variability due to length, randomly distributed SNPs, and the presence of encoded CD epitopes. Expression of this amplicon is reduced in both RNAi lines in comparison to the wild type. High N treatment significantly increases transcripts of the amplicon in the wild type, but not in the transgenic lines. Classification of α-gliadin variants, considering the number of epitopes, revealed that amplicon variants containing the full complement of 33-mer peptide were affected by N treatment, increasing their expression when N was increased. Line D793 provided higher and more stable silencing through different N fertilization regimes, expressing fewer CD epitopes than D783. Results of this study are important for better understanding of RNAi α-gliadin silencing in response to N treatments, and for undertaking new strategies by RNAi or CRISPR/Cas toward obtaining new varieties suitable for people suffering gluten intolerances.
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Sánchez-León S, Giménez MJ, Comino I, Sousa C, López Casado MÁ, Torres MI, Barro F. Stimulatory Response of Celiac Disease Peripheral Blood Mononuclear Cells Induced by RNAi Wheat Lines Differing in Grain Protein Composition. Nutrients 2019; 11:nu11122933. [PMID: 31816892 PMCID: PMC6950052 DOI: 10.3390/nu11122933] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 11/27/2019] [Accepted: 11/29/2019] [Indexed: 12/13/2022] Open
Abstract
Wheat gluten proteins are responsible for the bread-making properties of the dough but also for triggering important gastrointestinal disorders. Celiac disease (CD) affects approximately 1% of the population in Western countries. The only treatment available is the strict avoidance of gluten in the diet. Interference RNA (RNAi) is an excellent approach for the down-regulation of genes coding for immunogenic proteins related to celiac disease, providing an alternative for the development of cereals suitable for CD patients. In the present work, we report a comparative study of the stimulatory capacity of seven low-gluten RNAi lines differing in grain gluten and non-gluten protein composition, relevant for CD and other gluten pathologies. Peripheral blood mononuclear cells (PBMCs) of 35 patients with active CD were included in this study to assess the stimulatory response induced by protein extracts from the RNAi lines. Analysis of the proliferative response and interferon-gamma (INF-γ) release of PBMCs demonstrated impaired stimulation in response to all RNAi lines. The lower response was provided by lines with a very low content of α- and γ-gliadins, and low or almost devoid of DQ2.5 and p31-43 α-gliadin epitopes. The non-gluten protein seems not to play a key role in PBMC stimulation.
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Affiliation(s)
- Susana Sánchez-León
- Departamento de Mejora Genética Vegetal, Instituto de Agricultura Sostenible, 14004 Córdoba, Spain; (S.S.-L.); (M.J.G.)
| | - María José Giménez
- Departamento de Mejora Genética Vegetal, Instituto de Agricultura Sostenible, 14004 Córdoba, Spain; (S.S.-L.); (M.J.G.)
| | - Isabel Comino
- Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain; (I.C.); (C.S.)
| | - Carolina Sousa
- Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain; (I.C.); (C.S.)
| | | | - María Isabel Torres
- Departamento de Biología Experimental, Campus Universitario Las Lagunillas, 23071 Jaén, Spain;
| | - Francisco Barro
- Departamento de Mejora Genética Vegetal, Instituto de Agricultura Sostenible, 14004 Córdoba, Spain; (S.S.-L.); (M.J.G.)
- Correspondence:
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10
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Abstract
Gluten proteins, major determinants of the bread-making quality of wheat, are related to several digestive disorders. Advances in plant genetic breeding have allowed the production of wheat lines with very low gliadin content through the use of RNAi and gene editing technologies. In this review, we carried out a comprehensive study of the application of these cutting-edge technologies towards the development of wheat lines devoid of immunogenic gluten, and their genetic, nutritional and clinical characterization. One line, named E82, showed outstanding nutritional properties, with very low immunogenic gluten and a low stimulation capacity of T-cells from celiac patients. Moreover, a clinical trial with non-celiac wheat sensitivity (NCWS) patients showed that the consumption of bread made with this E82 low gliadin line induced positive changes in the gut microbiota composition.
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Affiliation(s)
- María Dolores García-Molina
- Department of Plant Breeding, Institute for Sustainable Agriculture (IAS-CSIC), 14004 Córdoba, Spain.
- DAFNE Department, University of Tuscia, 01100 Viterbo, Italy.
| | - María José Giménez
- Department of Plant Breeding, Institute for Sustainable Agriculture (IAS-CSIC), 14004 Córdoba, Spain.
| | - Susana Sánchez-León
- Department of Plant Breeding, Institute for Sustainable Agriculture (IAS-CSIC), 14004 Córdoba, Spain.
| | - Francisco Barro
- Department of Plant Breeding, Institute for Sustainable Agriculture (IAS-CSIC), 14004 Córdoba, Spain.
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11
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Gil-Humanes J, Wang Y, Liang Z, Shan Q, Ozuna CV, Sánchez-León S, Baltes NJ, Starker C, Barro F, Gao C, Voytas DF. High-efficiency gene targeting in hexaploid wheat using DNA replicons and CRISPR/Cas9. Plant J 2017; 89:1251-1262. [PMID: 27943461 PMCID: PMC8439346 DOI: 10.1111/tpj.13446] [Citation(s) in RCA: 211] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 11/17/2016] [Accepted: 11/24/2016] [Indexed: 05/17/2023]
Abstract
The ability to edit plant genomes through gene targeting (GT) requires efficient methods to deliver both sequence-specific nucleases (SSNs) and repair templates to plant cells. This is typically achieved using Agrobacterium T-DNA, biolistics or by stably integrating nuclease-encoding cassettes and repair templates into the plant genome. In dicotyledonous plants, such as Nicotinana tabacum (tobacco) and Solanum lycopersicum (tomato), greater than 10-fold enhancements in GT frequencies have been achieved using DNA virus-based replicons. These replicons transiently amplify to high copy numbers in plant cells to deliver abundant SSNs and repair templates to achieve targeted gene modification. In the present work, we developed a replicon-based system for genome engineering of cereal crops using a deconstructed version of the wheat dwarf virus (WDV). In wheat cells, the replicons achieve a 110-fold increase in expression of a reporter gene relative to non-replicating controls. Furthermore, replicons carrying CRISPR/Cas9 nucleases and repair templates achieved GT at an endogenous ubiquitin locus at frequencies 12-fold greater than non-viral delivery methods. The use of a strong promoter to express Cas9 was critical to attain these high GT frequencies. We also demonstrate gene-targeted integration by homologous recombination (HR) in all three of the homoeoalleles (A, B and D) of the hexaploid wheat genome, and we show that with the WDV replicons, multiplexed GT within the same wheat cell can be achieved at frequencies of ~1%. In conclusion, high frequencies of GT using WDV-based DNA replicons will make it possible to edit complex cereal genomes without the need to integrate GT reagents into the genome.
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Affiliation(s)
- Javier Gil-Humanes
- Department of Genetics, Cell Biology, and Development, Center for Genome Engineering, University of Minnesota, Minneapolis, MN 55455, USA
- Calyxt Inc., New Brighton, MN 55112, USA
| | - Yanpeng Wang
- State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Zhen Liang
- State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Qiwei Shan
- State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Carmen V. Ozuna
- Institute for Sustainable Agriculture, CSIC, E-14080, Córdoba, Spain
| | | | - Nicholas J. Baltes
- Department of Genetics, Cell Biology, and Development, Center for Genome Engineering, University of Minnesota, Minneapolis, MN 55455, USA
- Calyxt Inc., New Brighton, MN 55112, USA
| | - Colby Starker
- Department of Genetics, Cell Biology, and Development, Center for Genome Engineering, University of Minnesota, Minneapolis, MN 55455, USA
| | - Francisco Barro
- Institute for Sustainable Agriculture, CSIC, E-14080, Córdoba, Spain
| | - Caixia Gao
- State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Daniel F. Voytas
- Department of Genetics, Cell Biology, and Development, Center for Genome Engineering, University of Minnesota, Minneapolis, MN 55455, USA
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