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Vodicska B, Déri J, Tihanyi D, Várkondi E, Kispéter E, Dóczi R, Lakatos D, Dirner A, Vidermann M, Filotás P, Szalkai-Dénes R, Szegedi I, Bartyik K, Gábor KM, Simon R, Hauser P, Péter G, Kiss C, Garami M, Peták I. Real-world performance analysis of a novel computational method in the precision oncology of pediatric tumors. World J Pediatr 2023; 19:992-1008. [PMID: 36914906 PMCID: PMC10497647 DOI: 10.1007/s12519-023-00700-2] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Accepted: 01/31/2023] [Indexed: 03/16/2023]
Abstract
BACKGROUND The utility of routine extensive molecular profiling of pediatric tumors is a matter of debate due to the high number of genetic alterations of unknown significance or low evidence and the lack of standardized and personalized decision support methods. Digital drug assignment (DDA) is a novel computational method to prioritize treatment options by aggregating numerous evidence-based associations between multiple drivers, targets, and targeted agents. DDA has been validated to improve personalized treatment decisions based on the outcome data of adult patients treated in the SHIVA01 clinical trial. The aim of this study was to evaluate the utility of DDA in pediatric oncology. METHODS Between 2017 and 2020, 103 high-risk pediatric cancer patients (< 21 years) were involved in our precision oncology program, and samples from 100 patients were eligible for further analysis. Tissue or blood samples were analyzed by whole-exome (WES) or targeted panel sequencing and other molecular diagnostic modalities and processed by a software system using the DDA algorithm for therapeutic decision support. Finally, a molecular tumor board (MTB) evaluated the results to provide therapy recommendations. RESULTS Of the 100 cases with comprehensive molecular diagnostic data, 88 yielded WES and 12 panel sequencing results. DDA identified matching off-label targeted treatment options (actionability) in 72/100 cases (72%), while 57/100 (57%) showed potential drug resistance. Actionability reached 88% (29/33) by 2020 due to the continuous updates of the evidence database. MTB approved the clinical use of a DDA-top-listed treatment in 56 of 72 actionable cases (78%). The approved therapies had significantly higher aggregated evidence levels (AELs) than dismissed therapies. Filtering of WES results for targeted panels missed important mutations affecting therapy selection. CONCLUSIONS DDA is a promising approach to overcome challenges associated with the interpretation of extensive molecular profiling in the routine care of high-risk pediatric cancers. Knowledgebase updates enable automatic interpretation of a continuously expanding gene set, a "virtual" panel, filtered out from genome-wide analysis to always maximize the performance of precision treatment planning.
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Affiliation(s)
- Barbara Vodicska
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Júlia Déri
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Dóra Tihanyi
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Edit Várkondi
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Enikő Kispéter
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Róbert Dóczi
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Dóra Lakatos
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Anna Dirner
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Mátyás Vidermann
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Péter Filotás
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | | | - István Szegedi
- Division of Pediatric Hematology-Oncology, Department of Pediatrics, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Katalin Bartyik
- Department of Pediatrics, Albert Szent-Györgyi Medical School, University of Szeged, Szeged, Hungary
| | - Krisztina Míta Gábor
- Department of Pediatrics, Albert Szent-Györgyi Medical School, University of Szeged, Szeged, Hungary
| | - Réka Simon
- Onco-Hematology Department, Velkey László Paediatric Health Centre, Miskolc, Hungary
| | - Péter Hauser
- Department of Paediatrics, Semmelweis University, Budapest, Hungary
| | - György Péter
- Onco-Hematology Department, Heim Pál Children's Hospital, Budapest, Hungary
| | - Csongor Kiss
- Division of Pediatric Hematology-Oncology, Department of Pediatrics, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Miklós Garami
- Department of Paediatrics, Semmelweis University, Budapest, Hungary
| | - István Peták
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary.
- Department of Pharmacology and Pharmacotherapy, Semmelweis University, Budapest, Hungary.
- Department of Pharmaceutical Sciences, University of Illinois at Chicago, Chicago, USA.
- Genomate Health, Cambridge, MA, USA.
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Vodicska B, Déri J, Tihanyi D, Várkondi E, Kispéter E, Dóczi R, Lakatos D, Dirner A, Vidermann M, Filotás P, Szalkai-Dénes R, Szegedi I, Bartyik K, Gábor KM, Simon R, Hauser P, Péter G, Kiss C, Garami M, Peták I. Correction to: Real-world performance analysis of a novel computational method in the precision oncology of pediatric tumors. World J Pediatr 2023:10.1007/s12519-023-00724-8. [PMID: 37247168 DOI: 10.1007/s12519-023-00724-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Affiliation(s)
- Barbara Vodicska
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Júlia Déri
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Dóra Tihanyi
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Edit Várkondi
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Enikő Kispéter
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Róbert Dóczi
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Dóra Lakatos
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Anna Dirner
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Mátyás Vidermann
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | - Péter Filotás
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary
| | | | - István Szegedi
- Division of Pediatric Hematology-Oncology, Department of Pediatrics, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Katalin Bartyik
- Department of Pediatrics, Albert Szent-Györgyi Medical School, University of Szeged, Szeged, Hungary
| | - Krisztina Míta Gábor
- Department of Pediatrics, Albert Szent-Györgyi Medical School, University of Szeged, Szeged, Hungary
| | - Réka Simon
- Onco-Hematology Department, Velkey László Paediatric Health Centre, Miskolc, Hungary
| | - Péter Hauser
- Department of Paediatrics, Semmelweis University, Budapest, Hungary
| | - György Péter
- Onco-Hematology Department, Heim Pál Children's Hospital, Budapest, Hungary
| | - Csongor Kiss
- Division of Pediatric Hematology-Oncology, Department of Pediatrics, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Miklós Garami
- Department of Paediatrics, Semmelweis University, Budapest, Hungary
| | - István Peták
- Oncompass Medicine Hungary Kft, Retek Str. 34, Budapest, 1024, Hungary.
- Department of Pharmacology and Pharmacotherapy, Semmelweis University, Budapest, Hungary.
- Department of Pharmaceutical Sciences, University of Illinois at Chicago, Chicago, USA.
- Genomate Health, Cambridge, MA, USA.
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3
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Remenár É, Dóczi R, Dirner A, Sipos A, Perjési A, Tihanyi D, Vodicska B, Lakatos D, Horváth K, Kajáry K, Schwáb R, Déri J, Lengyel CG, Várkondi E, Vályi-Nagy I, Peták I. Lasting Complete Clinical Response of a Recurring Cutaneous Squamous Cell Carcinoma With MEK Mutation and PIK3CA Amplification Achieved by Dual Trametinib and Metformin Therapy. JCO Precis Oncol 2022; 6:e2100344. [PMID: 35005996 DOI: 10.1200/po.21.00344] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Éva Remenár
- Buda Hospitaller Order of St John of God, Budapest, Hungary
| | - Róbert Dóczi
- Oncompass Medicine Hungary Ltd, Budapest, Hungary
| | - Anna Dirner
- Oncompass Medicine Hungary Ltd, Budapest, Hungary
| | - Anna Sipos
- Oncompass Medicine Hungary Ltd, Budapest, Hungary
| | | | - Dóra Tihanyi
- Oncompass Medicine Hungary Ltd, Budapest, Hungary
| | | | - Dóra Lakatos
- Oncompass Medicine Hungary Ltd, Budapest, Hungary
| | | | | | - Richárd Schwáb
- Oncompass Medicine Hungary Ltd, Budapest, Hungary.,MiND Klinika Kft, Budapest, Hungary
| | - Júlia Déri
- Oncompass Medicine Hungary Ltd, Budapest, Hungary
| | | | | | - István Vályi-Nagy
- Centrum Hospital of Southern Pest, National Hematology and Infectology Institute, Budapest, Hungary
| | - István Peták
- Oncompass Medicine Hungary Ltd, Budapest, Hungary.,Department of Pharmacology, Semmelweis University, Budapest, Hungary.,Department of Pharmaceutical Sciences, University of Illinois at Chicago, Chicago, IL
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4
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Szkukalek J, Dóczi R, Dirner A, Boldizsár Á, Varga Á, Déri J, Lakatos D, Tihanyi D, Vodicska B, Schwáb R, Pajkos G, Várkondi E, Vályi-Nagy I, Valtinyi D, Nagy Z, Peták I. Personalized First-Line Treatment of Metastatic Pancreatic Neuroendocrine Carcinoma Facilitated by Liquid Biopsy and Computational Decision Support. Diagnostics (Basel) 2021; 11:1850. [PMID: 34679548 PMCID: PMC8534772 DOI: 10.3390/diagnostics11101850] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 09/28/2021] [Accepted: 09/28/2021] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND We present the case of a 50-year-old female whose metastatic pancreatic neuroendocrine tumor (pNET) diagnosis was delayed by the COVID-19 pandemic. The patient was in critical condition at the time of diagnosis due to the extensive tumor burden and failing liver functions. The clinical dilemma was to choose between two registered first-line molecularly-targeted agents (MTAs), sunitinib or everolimus, or to use chemotherapy to quickly reduce tumor burden. METHODS Cell-free DNA (cfDNA) from liquid biopsy was analyzed by next generation sequencing (NGS) using a comprehensive 591-gene panel. Next, a computational method, digital drug-assignment (DDA) was deployed for rapid clinical decision support. RESULTS NGS analysis identified 38 genetic alterations. DDA identified 6 potential drivers, 24 targets, and 79 MTAs. Everolimus was chosen for first-line therapy based on supporting molecular evidence and the highest DDA ranking among therapies registered in this tumor type. The patient's general condition and liver functions rapidly improved, and CT control revealed partial response in the lymph nodes and stable disease elsewhere. CONCLUSION Deployment of precision oncology using liquid biopsy, comprehensive molecular profiling, and DDA make personalized first-line therapy of advanced pNET feasible in clinical settings.
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Affiliation(s)
- Judita Szkukalek
- Department of Clinical Oncology, St. Imre Hospital, 1115 Budapest, Hungary; (J.S.); (D.V.); (Z.N.)
| | - Róbert Dóczi
- Oncompass Medicine Hungary Ltd., 1024 Budapest, Hungary; (R.D.); (A.D.); (Á.B.); (Á.V.); (J.D.); (D.L.); (D.T.); (B.V.); (R.S.); (G.P.); (E.V.)
| | - Anna Dirner
- Oncompass Medicine Hungary Ltd., 1024 Budapest, Hungary; (R.D.); (A.D.); (Á.B.); (Á.V.); (J.D.); (D.L.); (D.T.); (B.V.); (R.S.); (G.P.); (E.V.)
| | - Ákos Boldizsár
- Oncompass Medicine Hungary Ltd., 1024 Budapest, Hungary; (R.D.); (A.D.); (Á.B.); (Á.V.); (J.D.); (D.L.); (D.T.); (B.V.); (R.S.); (G.P.); (E.V.)
| | - Ágnes Varga
- Oncompass Medicine Hungary Ltd., 1024 Budapest, Hungary; (R.D.); (A.D.); (Á.B.); (Á.V.); (J.D.); (D.L.); (D.T.); (B.V.); (R.S.); (G.P.); (E.V.)
| | - Júlia Déri
- Oncompass Medicine Hungary Ltd., 1024 Budapest, Hungary; (R.D.); (A.D.); (Á.B.); (Á.V.); (J.D.); (D.L.); (D.T.); (B.V.); (R.S.); (G.P.); (E.V.)
| | - Dóra Lakatos
- Oncompass Medicine Hungary Ltd., 1024 Budapest, Hungary; (R.D.); (A.D.); (Á.B.); (Á.V.); (J.D.); (D.L.); (D.T.); (B.V.); (R.S.); (G.P.); (E.V.)
| | - Dóra Tihanyi
- Oncompass Medicine Hungary Ltd., 1024 Budapest, Hungary; (R.D.); (A.D.); (Á.B.); (Á.V.); (J.D.); (D.L.); (D.T.); (B.V.); (R.S.); (G.P.); (E.V.)
| | - Barbara Vodicska
- Oncompass Medicine Hungary Ltd., 1024 Budapest, Hungary; (R.D.); (A.D.); (Á.B.); (Á.V.); (J.D.); (D.L.); (D.T.); (B.V.); (R.S.); (G.P.); (E.V.)
| | - Richárd Schwáb
- Oncompass Medicine Hungary Ltd., 1024 Budapest, Hungary; (R.D.); (A.D.); (Á.B.); (Á.V.); (J.D.); (D.L.); (D.T.); (B.V.); (R.S.); (G.P.); (E.V.)
| | - Gábor Pajkos
- Oncompass Medicine Hungary Ltd., 1024 Budapest, Hungary; (R.D.); (A.D.); (Á.B.); (Á.V.); (J.D.); (D.L.); (D.T.); (B.V.); (R.S.); (G.P.); (E.V.)
| | - Edit Várkondi
- Oncompass Medicine Hungary Ltd., 1024 Budapest, Hungary; (R.D.); (A.D.); (Á.B.); (Á.V.); (J.D.); (D.L.); (D.T.); (B.V.); (R.S.); (G.P.); (E.V.)
| | - István Vályi-Nagy
- Centrum Hospital of Southern Pest, National Hematology and Infectology Institute, 1097 Budapest, Hungary;
| | - Dorottya Valtinyi
- Department of Clinical Oncology, St. Imre Hospital, 1115 Budapest, Hungary; (J.S.); (D.V.); (Z.N.)
| | - Zsuzsanna Nagy
- Department of Clinical Oncology, St. Imre Hospital, 1115 Budapest, Hungary; (J.S.); (D.V.); (Z.N.)
| | - István Peták
- Oncompass Medicine Hungary Ltd., 1024 Budapest, Hungary; (R.D.); (A.D.); (Á.B.); (Á.V.); (J.D.); (D.L.); (D.T.); (B.V.); (R.S.); (G.P.); (E.V.)
- Department of Pharmacology and Pharmacotherapy, Semmelweis University, 1089 Budapest, Hungary
- Department of Pharmaceutical Sciences, University of Illinois at Chicago, Chicago, IL 60612, USA
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5
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de Guillebon E, Jimenez M, Mazzarella L, Betsou F, Stadler P, Peták I, Jeannot E, Chanas L, Servant N, Marret G, Duso BA, Legrand F, Kornerup KN, Bernhart SH, Balogh G, Dóczi R, Filotás P, Curigliano G, Bièche I, Guérin J, Dirner A, Neuzillet C, Girard N, Borcoman E, Larbi Chérif L, Tresca P, Roufai DB, Dupain C, Scholl S, André F, Fernandez X, Filleron T, Kamal M, Le Tourneau C. Combining immunotherapy with an epidrug in squamous cell carcinomas of different locations: rationale and design of the PEVO basket trial. ESMO Open 2021; 6:100106. [PMID: 33865192 PMCID: PMC8066350 DOI: 10.1016/j.esmoop.2021.100106] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 01/12/2021] [Revised: 02/12/2021] [Accepted: 03/06/2021] [Indexed: 12/25/2022] Open
Abstract
Squamous cell carcinomas (SCCs) are among the most frequent solid tumors in humans. SCCs, related or not to the human papillomavirus, share common molecular features. Immunotherapies, and specifically immune checkpoint inhibitors, have been shown to improve overall survival in multiple cancer types, including SCCs. However, only a minority of patients experience a durable response with immunotherapy. Epigenetic modulation plays a major role in escaping tumor immunosurveillance and confers resistance to immune checkpoint inhibitors. Preclinical evidence suggests that modulating the epigenome might improve the efficacy of immunotherapy. We herein review the preclinical and the clinical rationale for combining immunotherapy with an epidrug, and detail the design of PEVOsq, a basket clinical trial combining pembrolizumab with vorinostat, a histone deacetylase inhibitor, in patients with SCCs of different locations. Sequential blood and tumor sampling will be collected in order to identify predictive and pharmacodynamics biomarkers of efficacy of the combination. We also present how clinical and biological data will be managed with the aim to enable the development of a prospective integrative platform to allow secure and controlled access to the project data as well as further exploitations.
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Affiliation(s)
- E de Guillebon
- Department of Drug Development and Innovation (D3i), Institut Curie, Paris, France; Inserm U932 Research Unit - Immunite et cancer, Paris, France
| | | | - L Mazzarella
- Department of Experimental Oncology, European Institute of Oncology - IRCCS, Milan, Italy; Division of Innovative Therapies, European Institute of Oncology - IRCCS, Milan, Italy
| | - F Betsou
- Integrated Biobank of Luxembourg, Dudelange, Luxembourg
| | - P Stadler
- Bioinformatics Group, Department of Computer, University of Leipzig, Leipzig, Germany
| | - I Peták
- Oncompass Medicine Ltd, Budapest, Hungary; Department of Pharmacology and Pharmacotherapy, Semmelweis University, Budapest, Hungary; Department of Pharmaceutical Sciences, University of Illinois at Chicago, Chicago, USA
| | - E Jeannot
- Department of Genetics, Institut Curie, Paris, France; Department of Pathology, Institut Curie, Paris, France
| | - L Chanas
- Data Direction, Institut Curie, Paris, France
| | - N Servant
- Inserm U900 Research Unit, Saint Cloud, France
| | - G Marret
- Department of Drug Development and Innovation (D3i), Institut Curie, Paris, France
| | - B A Duso
- Department of Experimental Oncology, European Institute of Oncology - IRCCS, Milan, Italy
| | | | - K N Kornerup
- Integrated Biobank of Luxembourg, Dudelange, Luxembourg
| | - S H Bernhart
- Bioinformatics Group, Department of Computer, University of Leipzig, Leipzig, Germany
| | - G Balogh
- Bioinformatics Group, Department of Computer, University of Leipzig, Leipzig, Germany
| | - R Dóczi
- Oncompass Medicine Ltd, Budapest, Hungary
| | - P Filotás
- Oncompass Medicine Ltd, Budapest, Hungary
| | - G Curigliano
- Division of Innovative Therapies, European Institute of Oncology - IRCCS, Milan, Italy; Department of Pharmacology and Pharmacotherapy, Semmelweis University, Budapest, Hungary; University of Milano, Milan, Italy
| | - I Bièche
- Department of Genetics, Institut Curie, Paris, France
| | - J Guérin
- Data Direction, Institut Curie, Paris, France
| | - A Dirner
- Oncompass Medicine Ltd, Budapest, Hungary
| | - C Neuzillet
- Department of Medical Oncology, Institut Curie, Paris, France; Paris-Saclay University, Paris, France
| | - N Girard
- Department of Medical Oncology, Institut Curie, Paris, France; Paris-Saclay University, Paris, France
| | - E Borcoman
- Department of Drug Development and Innovation (D3i), Institut Curie, Paris, France
| | - L Larbi Chérif
- Department of Drug Development and Innovation (D3i), Institut Curie, Paris, France
| | - P Tresca
- Department of Drug Development and Innovation (D3i), Institut Curie, Paris, France
| | - D B Roufai
- Department of Drug Development and Innovation (D3i), Institut Curie, Paris, France
| | - C Dupain
- Department of Drug Development and Innovation (D3i), Institut Curie, Paris, France
| | - S Scholl
- Department of Drug Development and Innovation (D3i), Institut Curie, Paris, France
| | - F André
- Department of Medical Oncology, Gustave Roussy, Villejuif; INSERM, Gustave Roussy Cancer Campus, UMR981, Villejuif; University of Paris-Sud, Orsay, France
| | - X Fernandez
- Data Direction, Institut Curie, Paris, France
| | - T Filleron
- Biostatistics Unit, Institut Claudius Regaud, Institut Universitaire du Cancer de Toulouse-Oncopole, Toulouse, France
| | - M Kamal
- Department of Drug Development and Innovation (D3i), Institut Curie, Paris, France.
| | - C Le Tourneau
- Department of Drug Development and Innovation (D3i), Institut Curie, Paris, France; Inserm U900 Research Unit, Saint Cloud, France; Paris-Saclay University, Paris, France.
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Urbán L, Dóczi R, Vodicska B, Tihanyi D, Horváth M, Kormos D, Takács I, Pápai-Székely Z, Póka-Farkas Z, Várkondi E, Schwáb R, Hegedüs C, Vályi-Nagy I, Peták I. Major Clinical Response to Afatinib Monotherapy in Lung Adenocarcinoma Harboring EGFR Exon 20 Insertion Mutation. Clin Lung Cancer 2020; 22:e112-e115. [PMID: 33082101 DOI: 10.1016/j.cllc.2020.09.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 09/02/2020] [Indexed: 11/19/2022]
Affiliation(s)
- László Urbán
- Mátraháza University and Teaching Hospital, Mátraháza, Hungary.
| | - Róbert Dóczi
- Oncompass Medicine Hungary Ltd, Budapest, Hungary
| | | | - Dóra Tihanyi
- Oncompass Medicine Hungary Ltd, Budapest, Hungary
| | | | - Dóra Kormos
- BAZ County Central and Teaching Hospital, Department of Internal Medicine and Lymphomatherapy V., Miskolc, Hungary
| | - István Takács
- BAZ County Central and Teaching Hospital, Department of Internal Medicine and Lymphomatherapy V., Miskolc, Hungary; Faculty of Healthcare, University of Miskolc, Miskolc, Hungary
| | - Zsolt Pápai-Székely
- Mátraháza University and Teaching Hospital, Mátraháza, Hungary; Fejér County and University Teaching Hospital, Székesfehérvár, Hungary
| | | | | | | | | | - István Vályi-Nagy
- Centrum Hospital of Southern Pest, National Hematology and Infectology Institute, Budapest, Hungary
| | - István Peták
- Oncompass Medicine Hungary Ltd, Budapest, Hungary; Department of Pharmacology, Semmelweis University, Budapest, Hungary; Department of Pharmaceutical Sciences, University of Illinois at Chicago, Chicago, IL.
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7
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Dóczi R, Tihanyi D, Filotas P, Dirner A, Pálházi B, Várkondi E, Farkas Z, Deri J, Lengyel E, Hegedus C, Petak I. Analysis of molecular profile complexities for immunotherapy decision support. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz253.083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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8
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Petak I, Hegedus C, Várkondi E, Farkas Z, Tihanyi D, Dóczi R, Mathiasz D, Lengyel E, Pajkos G, Schwab R, Deri J, Vályi-Nagy I. Introducing standardized medical procedure and dynamic decision support program in precision oncology for the community of practice. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz263.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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9
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Kalapos B, Hlavová M, Nádai TV, Galiba G, Bišová K, Dóczi R. Early Evolution of the Mitogen-Activated Protein Kinase Family in the Plant Kingdom. Sci Rep 2019; 9:4094. [PMID: 30858468 PMCID: PMC6411719 DOI: 10.1038/s41598-019-40751-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 02/04/2019] [Indexed: 01/23/2023] Open
Abstract
Mitogen-activated protein kinase (MAPK) pathways are central cellular signalling mechanisms in all eukaryotes. They are key regulators of the cell cycle and stress responses, yet evolution of MAPK families took markedly different paths in the animal and plant kingdoms. Instead of the characteristic divergence of MAPK types in animals, in plants an expanded network of ERK-like MAPKs has emerged. To gain insight into the early evolution of the plant MAPK family we identified and analysed MAPKs in 13 representative species across green algae, a large and diverse early-diverging lineage within the plant kingdom. Our results reveal that the plant MAPK gene family emerged from three types of progenitor kinases, which are ubiquitously present in algae, implying their formation in an early ancestor. Low number of MAPKs is characteristic across algae, the few losses or duplications are associated with genome complexity rather than habitat ecology, despite the importance of MAPKs in environmental signalling in flowering plants. ERK-type MAPKs are associated with cell cycle regulation in opisthokont models, yet in plants their stress-signalling function is more prevalent. Unicellular microalgae offer an excellent experimental system to study the cell cycle, and MAPK gene expression profiles show CDKB-like peaks around S/M phase in synchronised Chlamydomonas reinhardtii cultures, suggesting their participation in cell cycle regulation, in line with the notion that the ancestral eukaryotic MAPK was a cell cycle regulator ERK-like kinase. Our work also highlights the scarcity of signalling knowledge in microalgae, in spite of their enormous ecological impact and emerging economic importance.
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Affiliation(s)
- Balázs Kalapos
- Institute of Agriculture, Centre for Agricultural Research of the Hungarian Academy of Sciences, H-2462, Martonvásár, Brunszvik u. 2, Hungary.,Festetics Doctoral School, Georgikon Faculty, University of Pannonia, 8360, Keszthely, Hungary
| | - Monika Hlavová
- Centre Algatech, Institute of Microbiology Academy of Sciences of the Czech Republic, Opatovicky mlyn, CZ 379 81, Třeboň, Czech Republic
| | - Tímea V Nádai
- Institute of Agriculture, Centre for Agricultural Research of the Hungarian Academy of Sciences, H-2462, Martonvásár, Brunszvik u. 2, Hungary.,Festetics Doctoral School, Georgikon Faculty, University of Pannonia, 8360, Keszthely, Hungary
| | - Gábor Galiba
- Institute of Agriculture, Centre for Agricultural Research of the Hungarian Academy of Sciences, H-2462, Martonvásár, Brunszvik u. 2, Hungary.,Festetics Doctoral School, Georgikon Faculty, University of Pannonia, 8360, Keszthely, Hungary
| | - Kateřina Bišová
- Centre Algatech, Institute of Microbiology Academy of Sciences of the Czech Republic, Opatovicky mlyn, CZ 379 81, Třeboň, Czech Republic
| | - Róbert Dóczi
- Institute of Agriculture, Centre for Agricultural Research of the Hungarian Academy of Sciences, H-2462, Martonvásár, Brunszvik u. 2, Hungary.
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10
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Dóczi R, Hatzimasoura E, Farahi Bilooei S, Ahmad Z, Ditengou FA, López-Juez E, Palme K, Bögre L. The MKK7-MPK6 MAP Kinase Module Is a Regulator of Meristem Quiescence or Active Growth in Arabidopsis. Front Plant Sci 2019; 10:202. [PMID: 30891050 PMCID: PMC6413535 DOI: 10.3389/fpls.2019.00202] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 02/06/2019] [Indexed: 05/23/2023]
Abstract
Plant growth flexibly adapts to environmental conditions. Growth initiation itself may be conditional to a suitable environment, while the most common response of plants to adverse conditions is growth inhibition. Most of our understanding about environmental growth inhibition comes from studies on various plant hormones, while less is known about the signaling mechanisms involved. The mitogen-activated protein kinase (MAPK) cascades are central signal transduction pathways in all eukaryotes and their roles in plant stress responses is well-established, while increasing evidence points to their involvement in hormonal and developmental processes. Here we show that the MKK7-MPK6 module is a suppressor of meristem activity using genetic approaches. Shoot apical meristem activation during light-induced de-etiolation is accelerated in mpk6 and mkk7 seedlings, whereas constitutive or induced overexpression of MKK7 results in meristem defects or collapse, both in the shoot and the root apical meristems. These results underscore the role of stress-activated MAPK signaling in regulating growth responses at the whole plant level, which may be an important regulatory mechanism underlying the environmental plasticity of plant development.
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Affiliation(s)
- Róbert Dóczi
- Centre for Systems and Synthetic Biology, School of Biological Sciences, Royal Holloway, University of London, Egham, United Kingdom
- Institute of Agriculture, Centre for Agricultural Research, Hungarian Academy of Sciences, Martonvásár, Hungary
| | - Elizabeth Hatzimasoura
- Centre for Systems and Synthetic Biology, School of Biological Sciences, Royal Holloway, University of London, Egham, United Kingdom
| | - Sara Farahi Bilooei
- Centre for Systems and Synthetic Biology, School of Biological Sciences, Royal Holloway, University of London, Egham, United Kingdom
| | - Zaki Ahmad
- Centre for Systems and Synthetic Biology, School of Biological Sciences, Royal Holloway, University of London, Egham, United Kingdom
| | - Franck Anicet Ditengou
- Institute of Biology II, University of Freiburg, Freiburg im Breisgau, Germany
- BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg im Breisgau, Germany
- Centre for Systems and Synthetic Biology, School of Biological Sciences, University of Freiburg, Freiburg im Breisgau, Germany
| | - Enrique López-Juez
- Centre for Systems and Synthetic Biology, School of Biological Sciences, Royal Holloway, University of London, Egham, United Kingdom
| | - Klaus Palme
- Institute of Biology II, University of Freiburg, Freiburg im Breisgau, Germany
- BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg im Breisgau, Germany
- Centre for Systems and Synthetic Biology, School of Biological Sciences, University of Freiburg, Freiburg im Breisgau, Germany
| | - László Bögre
- Centre for Systems and Synthetic Biology, School of Biological Sciences, Royal Holloway, University of London, Egham, United Kingdom
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11
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Abstract
Mitogen-activated protein kinase (MAPK) pathways are versatile signaling mechanisms in all eukaryotes. Their signaling outputs are defined by the protein substrates phosphorylated by MAPKs. An expanding list of substrates has been identified by high-throughput screens and targeted approaches in plants. The majority of these are phosphorylated by MPK3/6, and a few by MPK4, which are the best-characterized plant MAPKs, participating in the regulation of numerous biological processes. The identified substrates clearly represent the functional diversity of MAPKs: they are associated with pathogen defense, abiotic stress responses, ethylene signaling, and various developmental functions. Understanding their outputs is integral to unraveling the complex regulatory mechanisms of MAPK cascades. We review here methodological approaches and provide an overview of known MAPK substrates.
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Affiliation(s)
- Róbert Dóczi
- Institute of Agriculture, Centre for Agricultural Research of the Hungarian Academy of Sciences, Brunszvik utca 2, H-2462 Martonvásár, Hungary.
| | - László Bögre
- School of Biological Sciences and Centre for Systems and Synthetic Biology, Royal Holloway, University of London, Egham TW20 0EX, UK
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12
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Ditengou FA, Gomes D, Nziengui H, Kochersperger P, Lasok H, Medeiros V, Paponov IA, Nagy SK, Nádai TV, Mészáros T, Barnabás B, Ditengou BI, Rapp K, Qi L, Li X, Becker C, Li C, Dóczi R, Palme K. Characterization of auxin transporter PIN6 plasma membrane targeting reveals a function for PIN6 in plant bolting. New Phytol 2018; 217:1610-1624. [PMID: 29218850 DOI: 10.1111/nph.14923] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [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: 06/13/2017] [Accepted: 10/23/2017] [Indexed: 05/25/2023]
Abstract
Auxin gradients are sustained by series of influx and efflux carriers whose subcellular localization is sensitive to both exogenous and endogenous factors. Recently the localization of the Arabidopsis thaliana auxin efflux carrier PIN-FORMED (PIN) 6 was reported to be tissue-specific and regulated through unknown mechanisms. Here, we used genetic, molecular and pharmacological approaches to characterize the molecular mechanism(s) controlling the subcellular localization of PIN6. PIN6 localizes to endomembrane domains in tissues with low PIN6 expression levels such as roots, but localizes at the plasma membrane (PM) in tissues with increased PIN6 expression such as the inflorescence stem and nectary glands. We provide evidence that this dual localization is controlled by PIN6 phosphorylation and demonstrate that PIN6 is phosphorylated by mitogen-activated protein kinases (MAPKs) MPK4 and MPK6. The analysis of transgenic plants expressing PIN6 at PM or in endomembrane domains reveals that PIN6 subcellular localization is critical for Arabidopsis inflorescence stem elongation post-flowering (bolting). In line with a role for PIN6 in plant bolting, inflorescence stems elongate faster in pin6 mutant plants than in wild-type plants. We propose that PIN6 subcellular localization is under the control of developmental signals acting on tissue-specific determinants controlling PIN6-expression levels and PIN6 phosphorylation.
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Affiliation(s)
- Franck Anicet Ditengou
- Institute of Biology II, Faculty of Biology, University of Freiburg, Schänzlestrasse 1, D-79104, Freiburg, Germany
| | - Dulceneia Gomes
- Institute of Biology II, Faculty of Biology, University of Freiburg, Schänzlestrasse 1, D-79104, Freiburg, Germany
| | - Hugues Nziengui
- Institute of Biology II, Faculty of Biology, University of Freiburg, Schänzlestrasse 1, D-79104, Freiburg, Germany
| | - Philip Kochersperger
- Institute of Biology II, Faculty of Biology, University of Freiburg, Schänzlestrasse 1, D-79104, Freiburg, Germany
| | - Hanna Lasok
- Institute of Biology II, Faculty of Biology, University of Freiburg, Schänzlestrasse 1, D-79104, Freiburg, Germany
| | - Violante Medeiros
- Institute of Biology II, Faculty of Biology, University of Freiburg, Schänzlestrasse 1, D-79104, Freiburg, Germany
| | - Ivan A Paponov
- Institute of Biology II, Faculty of Biology, University of Freiburg, Schänzlestrasse 1, D-79104, Freiburg, Germany
- NIBIO, Norwegian Institute for Bioeconomy Research, Postvegen 213, 4353, Klepp Stasjon, Norway
| | - Szilvia Krisztina Nagy
- Department of Medical Chemistry, Molecular Biology and Pathobiochemistry, Semmelweis University, Tűzoltó u. 37-47, H-1094, Budapest, Hungary
| | - Tímea Virág Nádai
- Department of Plant Cell Biology, Centre for Agricultural Research of the Hungarian Academy of Sciences, Brunszvik u. 2, H-2462, Martonvásár, Hungary
| | - Tamás Mészáros
- Department of Medical Chemistry, Molecular Biology and Pathobiochemistry, Semmelweis University, Tűzoltó u. 37-47, H-1094, Budapest, Hungary
- Research Group for Technical Analytical Chemistry, Hungarian Academy of Sciences, Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111, Budapest, Hungary
| | - Beáta Barnabás
- Department of Plant Cell Biology, Centre for Agricultural Research of the Hungarian Academy of Sciences, Brunszvik u. 2, H-2462, Martonvásár, Hungary
| | - Beata Izabela Ditengou
- Institute of Biology II, Faculty of Biology, University of Freiburg, Schänzlestrasse 1, D-79104, Freiburg, Germany
| | - Katja Rapp
- Institute of Biology II, Faculty of Biology, University of Freiburg, Schänzlestrasse 1, D-79104, Freiburg, Germany
| | - Linlin Qi
- VIB-UGent, Center for Plant Systems Biology, Gent, Belgium
| | - Xugang Li
- Institute of Biology II, Faculty of Biology, University of Freiburg, Schänzlestrasse 1, D-79104, Freiburg, Germany
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Daizong Street 61, Tai'an, 271018, China
| | - Claude Becker
- Institute of Biology II, Faculty of Biology, University of Freiburg, Schänzlestrasse 1, D-79104, Freiburg, Germany
- Gregor Mendel Institute of Molecular Plant Biology, Austrian Academy of Sciences, Vienna Biocenter (VBC), 1030, Vienna, Austria
| | - Chuanyou Li
- VIB-UGent, Center for Plant Systems Biology, Gent, Belgium
| | - Róbert Dóczi
- Department of Plant Cell Biology, Centre for Agricultural Research of the Hungarian Academy of Sciences, Brunszvik u. 2, H-2462, Martonvásár, Hungary
| | - Klaus Palme
- Institute of Biology II, Faculty of Biology, University of Freiburg, Schänzlestrasse 1, D-79104, Freiburg, Germany
- Gregor Mendel Institute of Molecular Plant Biology, Austrian Academy of Sciences, Vienna Biocenter (VBC), 1030, Vienna, Austria
- Centre for Biological Systems Analysis, Albert-Ludwigs-University of Freiburg, Habsburgerstrasse 49, 79104, Freiburg, Germany
- Freiburg Institute for Advanced Sciences (FRIAS), Albert-Ludwigs-University of Freiburg, Albertstrasse 19, 79104, Freiburg, Germany
- BIOSS Centre for Biological Signalling Studies, Albert-Ludwigs-University of Freiburg, Schänzlestrasse 18, 79104, Freiburg, Germany
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13
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Mohammed B, Bilooei SF, Dóczi R, Grove E, Railo S, Palme K, Ditengou FA, Bögre L, López-Juez E. Converging Light, Energy and Hormonal Signaling Control Meristem Activity, Leaf Initiation, and Growth. Plant Physiol 2018; 176:1365-1381. [PMID: 29284741 PMCID: PMC5813583 DOI: 10.1104/pp.17.01730] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 12/21/2017] [Indexed: 05/19/2023]
Abstract
The development of leaf primordia is subject to light control of meristematic activity. Light regulates the expression of thousands of genes with roles in cell proliferation, organ development, and differentiation of photosynthetic cells. Previous work has highlighted roles for hormone homeostasis and the energy-dependent Target of Rapamycin (TOR) kinase in meristematic activity, yet a picture of how these two regulatory mechanisms depend on light perception and interact with each other has yet to emerge. Their relevance beyond leaf initiation also is unclear. Here, we report the discovery that the dark-arrested meristematic region of Arabidopsis (Arabidopsis thaliana) experiences a local energy deprivation state and confirm previous findings that the PIN1 auxin transporter is diffusely localized in the dark. Light triggers a rapid removal of the starvation state and the establishment of PIN1 polar membrane localization consistent with auxin export, both preceding the induction of cell cycle- and cytoplasmic growth-associated genes. We demonstrate that shoot meristematic activity can occur in the dark through the manipulation of auxin and cytokinin activity as well as through the activation of energy signaling, both targets of photomorphogenesis action, but the organ developmental outcomes differ: while TOR-dependent energy signals alone stimulate cell proliferation, the development of a normal leaf lamina requires photomorphogenesis-like hormonal responses. We further show that energy signaling adjusts the extent of cell cycle activity and growth of young leaves non-cellautonomously to available photosynthates and leads to organs constituted of a greater number of cells developing under higher irradiance. This makes energy signaling perhaps the most important biomass growth determinant under natural, unstressed conditions.
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Affiliation(s)
- Binish Mohammed
- School of Biological Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, United Kingdom
| | - Sara Farahi Bilooei
- School of Biological Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, United Kingdom
| | - Róbert Dóczi
- Centre for Agricultural Research of the Hungarian Academy of Sciences, H-2462 Martonvasar, Brunszvik u. 2, Hungary
| | - Elliot Grove
- School of Biological Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, United Kingdom
| | - Saana Railo
- School of Biological Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, United Kingdom
| | - Klaus Palme
- Institute of Biology II, BIOSS Centre for Biological Signaling Studies, and Centre for Biological Systems Analysis, University of Freiburg, 79104 Freiburg, Germany
| | - Franck Anicet Ditengou
- Institute of Biology II, BIOSS Centre for Biological Signaling Studies, and Centre for Biological Systems Analysis, University of Freiburg, 79104 Freiburg, Germany
| | - László Bögre
- School of Biological Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, United Kingdom
| | - Enrique López-Juez
- School of Biological Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, United Kingdom
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14
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Dory M, Hatzimasoura E, Kállai BM, Nagy SK, Jäger K, Darula Z, Nádai TV, Mészáros T, López‐Juez E, Barnabás B, Palme K, Bögre L, Ditengou FA, Dóczi R. Coevolving MAPK and PID phosphosites indicate an ancient environmental control of PIN auxin transporters in land plants. FEBS Lett 2018; 592:89-102. [PMID: 29197077 PMCID: PMC5814726 DOI: 10.1002/1873-3468.12929] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [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: 07/27/2017] [Revised: 11/22/2017] [Accepted: 11/23/2017] [Indexed: 11/16/2022]
Abstract
Plant growth flexibly adapts to environmental conditions, implying cross-talk between environmental signalling and developmental regulation. Here, we show that the PIN auxin efflux carrier family possesses three highly conserved putative mitogen-activated protein kinase (MAPK) sites adjacent to the phosphorylation sites of the well-characterised AGC kinase PINOID, which regulates the polar localisation of PINs and directional auxin transport, thereby underpinning organ growth. The conserved sites of PIN1 are phosphorylated in vitro by two environmentally activated MAPKs, MPK4 and MPK6. In contrast to AGC kinases, MAPK-mediated phosphorylation of PIN1 at adjacent sites leads to a partial loss of the plasma membrane localisation of PIN1. MAPK-mediated modulation of PIN trafficking may participate in environmental adjustment of plant growth.
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Affiliation(s)
- Magdalena Dory
- Institute of AgricultureCentre for Agricultural ResearchHungarian Academy of SciencesMartonvásárHungary
| | - Elizabeth Hatzimasoura
- School of Biological Sciences and Centre for Systems and Synthetic BiologyRoyal Holloway, University of LondonEghamUK
| | - Brigitta M. Kállai
- Department of Medical ChemistryMolecular Biology and PathobiochemistrySemmelweis UniversityBudapestHungary
| | - Szilvia K. Nagy
- Department of Medical ChemistryMolecular Biology and PathobiochemistrySemmelweis UniversityBudapestHungary
| | - Katalin Jäger
- Institute of AgricultureCentre for Agricultural ResearchHungarian Academy of SciencesMartonvásárHungary
| | - Zsuzsanna Darula
- Laboratory of Proteomics ResearchBiological Research CentreHungarian Academy of SciencesSzegedHungary
| | - Tímea V. Nádai
- Institute of AgricultureCentre for Agricultural ResearchHungarian Academy of SciencesMartonvásárHungary
| | - Tamás Mészáros
- Department of Medical ChemistryMolecular Biology and PathobiochemistrySemmelweis UniversityBudapestHungary
| | - Enrique López‐Juez
- School of Biological Sciences and Centre for Systems and Synthetic BiologyRoyal Holloway, University of LondonEghamUK
| | - Beáta Barnabás
- Institute of AgricultureCentre for Agricultural ResearchHungarian Academy of SciencesMartonvásárHungary
| | - Klaus Palme
- Institute of Biology IIUniversity of FreiburgGermany
- BIOSS Centre for Biological Signalling StudiesUniversity of FreiburgGermany
- Centre for Biological Systems Analysis (ZBSA)University of FreiburgGermany
| | - László Bögre
- School of Biological Sciences and Centre for Systems and Synthetic BiologyRoyal Holloway, University of LondonEghamUK
| | - Franck A. Ditengou
- Institute of Biology IIUniversity of FreiburgGermany
- BIOSS Centre for Biological Signalling StudiesUniversity of FreiburgGermany
- Centre for Biological Systems Analysis (ZBSA)University of FreiburgGermany
| | - Róbert Dóczi
- Institute of AgricultureCentre for Agricultural ResearchHungarian Academy of SciencesMartonvásárHungary
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15
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Dóczi R, Semkova V, Fenyvesi A, Yamamuro N, Buczkó CM, Csikai J. Excitation Functions of Some (n, p) and (n, α) Reactions from Threshold to 16 MeV. NUCL SCI ENG 2017. [DOI: 10.13182/nse98-a1970] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- R. Dóczi
- Kossuth University, Institute of Experimental Physics, H-4001 Debrecen, Pf. 105, Hungary
| | - V. Semkova
- Bulgarian Academy of Sciences, Institute for Nuclear Research and Nuclear Energy Tzarigradsko chausse 72, 1784 Sofia, Bulgaria
| | - A. Fenyvesi
- Institute of Nuclear Research of the Hungarian Academy of Sciences P.O.B. 51, H-4001 Debrecen, Hungary
| | - N. Yamamuro
- Kitahassaku 60, Midori-ku, Yokohama, Knagawa-ken 226, Japan
| | - Cs. M. Buczkó
- Kossuth University, Institute of Experimental Physics, H-4001 Debrecen, Pf. 105, Hungary
| | - J. Csikai
- Kossuth University, Institute of Experimental Physics, H-4001 Debrecen, Pf. 105, Hungary
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16
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Oláh Z, Kremmer T, Vogg A, Varga Z, Szűcs Z, Neumaier B, Dóczi R. Novel ion exchange chromatography method for nca arsenic separation. Appl Radiat Isot 2017; 122:111-115. [DOI: 10.1016/j.apradiso.2017.01.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 12/15/2016] [Accepted: 01/13/2017] [Indexed: 11/30/2022]
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17
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Dory M, Doleschall Z, Nagy SK, Ambrus H, Mészáros T, Barnabás B, Dóczi R. Kinase-Associated Phosphoisoform Assay: a novel candidate-based method to detect specific kinase-substrate phosphorylation interactions in vivo. BMC Plant Biol 2016; 16:204. [PMID: 27655033 PMCID: PMC5031308 DOI: 10.1186/s12870-016-0894-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 09/12/2016] [Indexed: 05/30/2023]
Abstract
BACKGROUND Protein kinases are important components of signalling pathways, and kinomes have remarkably expanded in plants. Yet, our knowledge of kinase substrates in plants is scarce, partly because tools to analyse protein phosphorylation dynamically are limited. Here we describe Kinase-Associated Phosphoisoform Assay, a flexible experimental method for directed experiments to study specific kinase-substrate interactions in vivo. The concept is based on the differential phosphoisoform distribution of candidate substrates transiently expressed with or without co-expression of activated kinases. Phosphorylation status of epitope-tagged proteins is subsequently detected by high-resolution capillary isoelectric focusing coupled with nanofluidic immunoassay, which is capable of detecting subtle changes in isoform distribution. RESULTS The concept is validated by showing phosphorylation of the known mitogen-activated protein kinase (MAPK) substrate, ACS6, by MPK6. Next, we demonstrate that two transcription factors, WUS and AP2, both of which are shown to be master regulators of plant development by extensive genetic studies, exist in multiple isoforms in plant cells and are phosphorylated by activated MAPKs. CONCLUSION As plant development flexibly responds to environmental conditions, phosphorylation of developmental regulators by environmentally-activated kinases may participate in linking external cues to developmental regulation. As a counterpart of advances in unbiased screening methods to identify potential protein kinase substrates, such as phosphoproteomics and computational predictions, our results expand the candidate-based experimental toolkit for kinase research and provide an alternative in vivo approach to existing in vitro methodologies.
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Affiliation(s)
- Magdalena Dory
- Department of Plant Cell Biology, Centre for Agricultural Research of the Hungarian Academy of Sciences, H-2462, Brunszvik u. 2, Martonvásár, Hungary
| | - Zoltán Doleschall
- Department of Pathogenetics, National Institute of Oncology, H-1122, Ráth György u. 7-9, Budapest, Hungary
| | - Szilvia K. Nagy
- Department of Medical Chemistry, Molecular Biology and Pathobiochemistry, Semmelweis University, H-1094, Tűzoltó u. 37-47, Budapest, Hungary
| | - Helga Ambrus
- Department of Plant Cell Biology, Centre for Agricultural Research of the Hungarian Academy of Sciences, H-2462, Brunszvik u. 2, Martonvásár, Hungary
| | - Tamás Mészáros
- Department of Medical Chemistry, Molecular Biology and Pathobiochemistry, Semmelweis University, H-1094, Tűzoltó u. 37-47, Budapest, Hungary
- Research Group for Technical Analytical Chemistry, Hungarian Academy of Sciences - Budapest University of Technology and Economics, H-1111, Szt. Gellért tér 4, Budapest, Hungary
| | - Beáta Barnabás
- Department of Plant Cell Biology, Centre for Agricultural Research of the Hungarian Academy of Sciences, H-2462, Brunszvik u. 2, Martonvásár, Hungary
| | - Róbert Dóczi
- Department of Plant Cell Biology, Centre for Agricultural Research of the Hungarian Academy of Sciences, H-2462, Brunszvik u. 2, Martonvásár, Hungary
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18
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Dóczi R, Okrész L, Romero AE, Paccanaro A, Bögre L. Exploring the evolutionary path of plant MAPK networks. Trends Plant Sci 2012; 17:518-25. [PMID: 22682803 DOI: 10.1016/j.tplants.2012.05.009] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2012] [Revised: 05/01/2012] [Accepted: 05/10/2012] [Indexed: 05/08/2023]
Abstract
The evolutionarily conserved mitogen-activated protein kinase (MAPK) signaling network comprises connected protein kinases arranged in MAPK modules. In this Opinion article, we analyze MAPK signaling components in evolutionarily representative species of the plant lineage and in Naegleria gruberi, a member of an early diverging eukaryotic clade. In Naegleria, there are two closely related MAPK kinases (MKKs) and a single conventional MAPK, whereas in several species of algae, there are two distinct MKKs and multiple MAPKs belonging to different groups. This suggests that the formation of multiple MAPK modules began early during plant evolution. The expansion of MAPK signaling components through gene duplications and the evolution of interaction motifs could have contributed to the highly connected complex MAPK signaling network that we know in Arabidopsis.
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Affiliation(s)
- Róbert Dóczi
- Institute of Agriculture, Agricultural Research Centre of the Hungarian Academy of Sciences, Brunszvik Rd 2, Martonvásár, H-2462, Hungary
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19
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Ditrói F, Tárkányi F, Takács S, Dóczi R, Hermanne A, Ignatyuk A. Study of excitation function of deuteron induced reactions on natKr up to 20MeV. Appl Radiat Isot 2012; 70:574-82. [DOI: 10.1016/j.apradiso.2011.12.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 12/14/2011] [Accepted: 12/16/2011] [Indexed: 10/14/2022]
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20
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Abstract
Mitogen-activated protein (MAP) kinase pathways are conserved in eukaryotes and transmit a plethora of stimuli. MAP kinases (MAPKs) are part of signalling modules that consist of three to four tiers of protein kinases in a phosphorylation cascade. MAPKs are known to phosphorylate specific substrates at specific sites at a -threonine or serine residue followed by proline, but the surrounding amino acids of the phosphorylation site and docking interactions are also important for substrate recognition. MAPK activity can be assayed by detecting their phosphotransferase activity, their activation state, or detecting the switching on or off reaction of specific genes, or cellular responses. Prior to the kinase assay, specific MAPK proteins can be immunoprecipitated either by MAPK-specific antibodies or by the introduction of C-terminal epitope tags and expression of the fusion proteins in planta or transiently in protoplasts. Protoplasts derived from Arabidopsis thaliana cell cultures or leaves provide a valuable tool to co-express multiple gene constructs, thus in this system MAPKs can be co-expressed with upstream regulatory components or downstream targets. In protoplasts, the signalling activity through MAPK pathways can also be monitored by -co-transforming reporter genes fused to target promoters. Furthermore, components of the MAPK -signalling pathways can be silenced by co-transformation of RNAi or amiRNA constructs, and the impact of silencing on MAPK activation or gene expression can thus be determined.
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Affiliation(s)
- Róbert Dóczi
- Agricultural Research Institute of the Hungarian Academy of Sciences, Martonvásár, Hungary.
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21
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Abstract
A new route has been investigated for the production of the 81Rb(81
mKr) generator parent radionuclide at low energy cyclotrons. The excitation function of the 80Kr(d,n) 81Rb reaction was measured up to 14 MeV using natural Kr gas as target, the activation method and a stacked gas-cell irradiation technique. The saturation yield of 81Rb over the energy range Ed = 14 → 6 MeV amounts to 2.86 GBq/μA. A comparison of this production method with the commonly used 82Kr(p,2n) 81Rb route is given.
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22
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Csikai J, Dóczi R. Optimization of source–sample–detector geometries for bulk hydrogen analysis using epithermal neutrons. Appl Radiat Isot 2009; 67:70-2. [DOI: 10.1016/j.apradiso.2008.09.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2008] [Accepted: 09/02/2008] [Indexed: 11/29/2022]
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Menges M, Dóczi R, Ökrész L, Morandini P, Mizzi L, Soloviev M, Murray JAH, Bögre L. Comprehensive gene expression atlas for the Arabidopsis MAP kinase signalling pathways. New Phytol 2008; 179:643-662. [PMID: 18715324 DOI: 10.1111/j.1469-8137.2008.02552.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
* Mitogen activated protein kinase (MAPK) pathways are signal transduction modules with layers of protein kinases having c. 120 genes in Arabidopsis, but only a few have been linked experimentally to functions. * We analysed microarray expression data for 114 MAPK signalling genes represented on the ATH1 Affymetrix arrays; determined their expression patterns during development, and in a wide range of time-course microarray experiments for their signal-dependent transcriptional regulation and their coregulation with other signalling components and transcription factors. * Global expression correlation of the MAPK genes with each of the represented 21 692 Arabidopsis genes was determined by calculating Pearson correlation coefficients. To group MAPK signalling genes based on similarities in global regulation, we performed hierarchical clustering on the pairwise correlation values. This should allow inferring functional information from well-studied MAPK components to functionally uncharacterized ones. Statistical overrepresentation of specific gene ontology (GO) categories in the gene lists showing high expression correlation values with each of the MAPK components predicted biological themes for the gene functions. * The combination of these methods provides functional information for many uncharacterized MAPK genes, and a framework for complementary future experimental dissection of the function of this complex family.
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Affiliation(s)
- Margit Menges
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QT, UK
| | - Róbert Dóczi
- School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
| | - László Ökrész
- Institute of Plant Biology, Biological Research Centre, POB 521, H-6701, Szeged, Hungary
| | - Piero Morandini
- Department of Biology, University of Milan and CNR Biophysics Institute (Milan Section), Via Celoria 26, I-20133 Milan, Italy
| | - Luca Mizzi
- Department of Biomolecular Sciences and Biotechnology, University of Milan and CNR Biophysics Institute (Milan Section), Via Celoria 26, I-20133 Milan, Italy
| | - Mikhail Soloviev
- School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
| | - James A H Murray
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QT, UK
| | - László Bögre
- School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
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Dóczi R, Brader G, Pettkó-Szandtner A, Rajh I, Djamei A, Pitzschke A, Teige M, Hirt H. The Arabidopsis mitogen-activated protein kinase kinase MKK3 is upstream of group C mitogen-activated protein kinases and participates in pathogen signaling. Plant Cell 2007; 19:3266-79. [PMID: 17933903 PMCID: PMC2174707 DOI: 10.1105/tpc.106.050039] [Citation(s) in RCA: 156] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2007] [Revised: 09/21/2007] [Accepted: 09/27/2007] [Indexed: 05/17/2023]
Abstract
Although the Arabidopsis thaliana genome contains genes encoding 20 mitogen-activated protein kinases (MAPKs) and 10 MAPK kinases (MAPKKs), most of them are still functionally uncharacterized. In this work, we analyzed the function of the group B MAPK kinase, MKK3. Transgenic ProMKK3:GUS lines showed basal expression in vascular tissues that was strongly induced by Pseudomonas syringae pv tomato strain DC3000 (Pst DC3000) infection but not by abiotic stresses. The growth of virulent Pst DC3000 was increased in mkk3 knockout plants and decreased in MKK3-overexpressing plants. Moreover, MKK3 overexpression lines showed increased expression of several PR genes. By yeast two-hybrid analysis, coimmunoprecipitation, and protein kinase assays, MKK3 was revealed to be an upstream activator of the group C MAPKs MPK1, MPK2, MPK7, and MPK14. Flagellin-derived flg22 peptide strongly activated MPK6 but resulted in poor activation of MPK7. By contrast, MPK6 and MPK7 were both activated by H(2)O(2), but only MPK7 activation was enhanced by MKK3. In agreement with the notion that MKK3 regulates the expression of PR genes, ProPR1:GUS expression was strongly enhanced by coexpression of MKK3-MPK7. Our results reveal that the MKK3 pathway plays a role in pathogen defense and further underscore the importance and complexity of MAPK signaling in plant stress responses.
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Affiliation(s)
- Róbert Dóczi
- Department of Plant Molecular Biology, Max F. Perutz Laboratories, University of Viena, A-1030 Viena, Austria
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25
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Csikai J, Dóczi R. A comparison of the neutron thermalization and reflection methods used for bulk hydrogen analysis. Appl Radiat Isot 2007; 65:764-8. [PMID: 17403604 DOI: 10.1016/j.apradiso.2007.01.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2007] [Accepted: 01/31/2007] [Indexed: 10/23/2022]
Abstract
The advantages and limitations of the slowing down of epithermal neutrons and the thermal neutron reflection methods were compared for bulk hydrogen analysis. In both cases, the same sample dimensions were used, i.e. 10cm diameter and 8cm height. It was found that the sensitivity of the slowing down method is higher by a factor of approximately 20 in average and the matrix effect can be neglected as compared to the neutron reflection technique. The simultaneous application of the two methods renders the determination of the H content and the C/H atomic ratio possible. The effect of spatial distribution of hydrogen in the matrix to be investigated on the number of reflected neutrons was also studied.
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Affiliation(s)
- J Csikai
- Institute of Experimental Physics, University of Debrecen, Pf. 105, 4010 Debrecen-10, Hungary
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26
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Dóczi R, Ali MA, Fayez-Hassan M, Csikai J. Determination of hydrogen content in bulk samples using the neutron activation method. Appl Radiat Isot 2005; 63:137-40. [PMID: 15866459 DOI: 10.1016/j.apradiso.2005.02.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2005] [Accepted: 02/28/2005] [Indexed: 11/22/2022]
Abstract
The applicability of a new irradiation facility for bulk hydrogen analysis based on the activation method using thermal and epithermal neutrons has been tested for cylindrical samples of 8 cm diameter and 10 cm high. A definite correlation was found between the relative excess flux values, R and the total hydrogen contents, N(H) of the samples. Analytical expressions obtained for R vs. N(H) function indicate the possible use of this method even in the case of approximately kg weight and liter sample dimensions. The large sample has a special advantage if the determination of the hydrogen concentration, C(H) is in question.
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Affiliation(s)
- R Dóczi
- Institute of Nuclear Research of the Hungarian Academy of Sciences, 4001 Debrecen, Pf. 51, Hungary.
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27
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Dóczi R, Kondrák M, Kovács G, Beczner F, Bánfalvi Z. Conservation of the drought-inducible DS2 genes and divergences from their ASR paralogues in solanaceous species. Plant Physiol Biochem 2005; 43:269-76. [PMID: 15854835 DOI: 10.1016/j.plaphy.2005.02.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2004] [Accepted: 02/04/2005] [Indexed: 05/08/2023]
Abstract
The drought-inducible DS2 genes of potatoes are members of the ASR (abscisic acid, stress and ripening) gene family. Previously it was shown that expression of DS2 genes is highly dehydration-specific in potato leaves, is not inducible by cold, heat, salt, hypoxia or oxidative stresses, and is independent of abscisic acid (ABA). Now it is shown that StDS2 does not respond either to sucrose or any plant hormones. Conservation of DS2 genes with this unique mode of regulation was studied in the solanaceous species with different relationships to potatoes. DS2 orthologues were identified by DNA sequence alignment in the closely related Lycopersicon and Capsicum species but not in the more distantly related Nicotiana sp. DNA and RNA gel blot analysis revealed the presence of a gene highly homologous to the potato gene StDS2 in tomato (LeDS2) with the same desiccation-specific expression in leaves and organ-specific expression in flowers and green fruits. The LeDS2 promoter was isolated and found to be almost identical in sequence with the promoter of StDS2, except for a 45-bp insertion in tomato. In contrast, no gene highly similar to StDS2 was detected in Nicotiana species on DNA gel blots. Neither StDS2 nor LeDS2 promoter regions were able to confer expression for the beta-glucuronidase (GUS) reporter gene in transgenic tobacco plants indicating that the trans regulatory factors necessary for DS2 expression are not conserved either in Nicotiana tabacum. These data suggest a narrow species-specificity and late evolution of the DS2-type genes within the family Solanaceae.
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Affiliation(s)
- Róbert Dóczi
- Agricultural Biotechnology Center, P.O. Box 411, H-2101 Gödöllö, Hungary
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28
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Teige M, Scheikl E, Eulgem T, Dóczi R, Ichimura K, Shinozaki K, Dangl JL, Hirt H. The MKK2 pathway mediates cold and salt stress signaling in Arabidopsis. Mol Cell 2004; 15:141-52. [PMID: 15225555 DOI: 10.1016/j.molcel.2004.06.023] [Citation(s) in RCA: 550] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2004] [Revised: 05/26/2004] [Accepted: 06/09/2004] [Indexed: 11/24/2022]
Abstract
The Arabidopsis mitogen-activated protein kinase (MAPK) kinase 2 (MKK2) and the downstream MAPKs MPK4 and MPK6 were isolated by functional complementation of osmosensitive yeast mutants. In Arabidopsis protoplasts, MKK2 was specifically activated by cold and salt stress and by the stress-induced MAPK kinase kinase MEKK1. Yeast two-hybrid, in vitro, and in vivo protein kinase assays revealed that MKK2 directly targets MPK4 and MPK6. Accordingly, plants overexpressing MKK2 exhibited constitutive MPK4 and MPK6 activity, constitutively upregulated expression of stress-induced marker genes, and increased freezing and salt tolerance. In contrast, mkk2 null plants were impaired in MPK4 and MPK6 activation and were hypersensitive to salt and cold stress. Full genome transcriptome analysis of MKK2-overexpressing plants demonstrated altered expression of 152 genes involved in transcriptional regulation, signal transduction, cellular defense, and stress metabolism. These data identify a MAP kinase signaling cascade mediating cold and salt stress tolerance in plants.
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Affiliation(s)
- Markus Teige
- Max F. Perutz Laboratories, University of Vienna and Gregor Mendel Institute of Molecular Plant Sciences, Austrian Academy of Sciences, Vienna Biocenter, Dr. Bohrgasse 9, A-1030 Vienna, Austria.
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Abstract
Principles and techniques of some neutron-based methods used to identify the antipersonnel landmines (APMs) are discussed. New results have been achieved in the field of neutron reflection, transmission, scattering and reaction techniques. Some conclusions are as follows: The neutron hand-held detector is suitable for the observation of anomaly caused by a DLM2-like sample in different soils with a scanning speed of 1m(2)/1.5 min; the reflection cross section of thermal neutrons rendered the determination of equivalent thickness of different soil components possible; a simple method was developed for the determination of the thermal neutron flux perturbation factor needed for multi-elemental analysis of bulky samples; unfolded spectra of elastically backscattered neutrons using broad-spectrum sources render the identification of APMs possible; the knowledge of leakage spectra of different source neutrons is indispensable for the determination of the differential and integrated reaction rates and through it the dimension of the interrogated volume; the precise determination of the C/O atom fraction requires the investigations on the angular distribution of the 6.13MeV gamma-ray emitted in the (16)O(n,n'gamma) reaction. These results, in addition to the identification of landmines, render the improvement of the non-intrusive neutron methods possible.
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Affiliation(s)
- J Csikai
- Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), P.O.B. 51, Debrecen H-4001, Hungary.
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Csikai J, Semkova V, Dóczi R, Majdeddin A, Várnagy M, Buczkó C, Fenyvesi A. Measured, estimated and calculated (n,α) cross-sections for fusion applications. Fusion Engineering and Design 1997. [DOI: 10.1016/s0920-3796(97)00032-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Klopries RM, Dóczi R, Csikai J, Qaim SM. Excitation Functions of some Neutron Threshold Reactions on 89Y in the Energy Range of 7.8 to 14.7 MeV. ACTA ACUST UNITED AC 1997. [DOI: 10.1524/ract.1997.76.12.3] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- R. M. Klopries
- Institut für Nuklearchemie, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
| | - R. Dóczi
- Institut für Nuklearchemie, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
- Institute of Experimental Physics, Kossuth University, H-4001 Debrecen, Hungary
| | - J. Csikai
- Institute of Experimental Physics, Kossuth University, H-4001 Debrecen, Hungary
| | - S. M. Qaim
- Institut für Nuklearchemie, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
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