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Duan R, Huang J, Zhang D, Tian E. Identification of lethal species in amanita section Phalloideae based on nucleotide signature and specific TaqMan-MGB probe and primer. Front Microbiol 2024; 15:1301085. [PMID: 38362500 PMCID: PMC10867329 DOI: 10.3389/fmicb.2024.1301085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Accepted: 01/18/2024] [Indexed: 02/17/2024] Open
Abstract
Amanita section Phalloideae consists of lethal toxic mushroom species, causing many fatal poisoning incidents worldwide. Molecular techniques of nucleotide signatures and single nucleotide polymorphism (SNP) detection could be used to develop a specific method for identifying lethal section (sect.) Phalloideae species. A comparison of 38 sequenced and 228 validated sequences from sect. Phalloideae species showed a 17-base pair nucleotide signature and an SNP site between the lethal and non-lethal species. A specific minor groove binder probe was designed based on them. The results indicated that this method exhibited excellent specificity for the lethal subgroup, good detection in samples subjected to simulated gastric digestion (60 min boiling and 120 min digestion), and a 10 pg./μL detection limit. This method enables accurate detection of target species in samples under complex conditions and can provide evidence for poisoning incidents caused by lethal sect. Phalloideae species to assist in targeted treatment strategies.
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Affiliation(s)
| | | | | | - Enjing Tian
- Country Engineering Research Center of Edible and Medicinal Fungi, Ministry of Education, Jilin Agricultural University, Changchun, China
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2
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Vetter J. Amanitins: The Most Poisonous Molecules of the Fungal World. Molecules 2023; 28:5932. [PMID: 37570902 PMCID: PMC10421264 DOI: 10.3390/molecules28155932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 07/29/2023] [Accepted: 08/04/2023] [Indexed: 08/13/2023] Open
Abstract
Among the toxic metabolites of the fungal world, those that, due to their strong biological effect, can seriously (even fatally) damage the life processes of humans (and certain groups of animals) stand out. Amatoxin-containing mushrooms and the poisonings caused by them stand out from the higher fungi, the mushrooms. There are already historical data and records about such poisonings, but scientific research on the responsible molecules began in the middle of the last century. The goals of this review work are as follows: presentation of the cosmopolitan mushroom species that produce amanitins (which are known from certain genera of four mushroom families), an overview of the chemical structure and specific properties of amanitins, a summary of the analytical methods applicable to them, a presentation of the "medical history" of poisonings, and a summary of the therapeutic methods used so far. The main responsible molecules (the amanitins) are bicyclic octapeptides, whose structure is characterized by an outer loop and an inner loop (bridge). It follows from the unusual properties of amanitins, especially their extreme stability (against heat, the acidic pH of the medium, and their resistance to human, and animal, digestive enzymes), that they are absorbed almost without hindrance and quickly transported to our vital organs. Adding to the problems is that accidental consumption causes no noticeable symptoms for a few hours (or even 24-36 h) after consumption, but the toxins already damage the metabolism of the target organs and the synthesis of nucleic acid and proteins. The biochemical catastrophe of the cells causes irreversible structural changes, which lead to necrotic damage (in the liver and kidneys) and death. The scientific topicality of the review is due to the recent publication of new data on the probable antidote molecule (ICR: indocyanine green) against amanitins. Further research can provide a new foundation for the therapeutic treatment of poisonings, and the toxicological situation, which currently still poses a deadly threat, could even be tamed into a controllable problem. We also draw attention to the review conclusions, as well as the mycological and social tasks related to amanitin poisonings (prevention of poisonings).
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Affiliation(s)
- János Vetter
- Department of Botany, University of Veterinary Medicine, Pf. 2., 1400 Budapest, Hungary
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Xie X, Li B, Fan Y, Duan R, Gao C, Zheng Y, Tian E. Identification of Gyromitra infula: A Rapid and Visual Method Based on Loop-Mediated Isothermal Amplification. Front Microbiol 2022; 13:842178. [PMID: 35250953 PMCID: PMC8894891 DOI: 10.3389/fmicb.2022.842178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 01/27/2022] [Indexed: 11/25/2022] Open
Abstract
With mushroom poisoning emerging as one of the most serious food safety problems worldwide, a rapid identification method of poisonous mushrooms is urgently required to investigate the source of poisoning. Gyromitra infula, a kind of poisonous mushroom, contains gyromitrin toxin, which causes epileptogenic neurotoxicity and hemolytic disease. This study aimed to establish a rapid and visual method of G. infula identification based on loop-mediated isothermal amplification (LAMP). A set of specific LAMP primers was designed, and its specificity in G. infula was confirmed against various mushroom species, including its closely related species and other macrofungi. The sensitivity assay showed that the minimum concentration of genomic DNA detected by LAMP was 1 ng/μl. The method’s applicability was conducted by preparing mushroom samples that were boiled and digested in artificial gastric juice. The results showed that the content as low as 1% G. infula can be successfully detected. This method can be completed within 90 min, and the reaction results can be directly observed by the naked eyes. Hence, the identification method of G. infula established based on LAMP in this study is accurate, rapid, sensitive, and low-cost, which is required for clinical treatment or forensic analysis when mushroom poisoning occurs.
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Affiliation(s)
- Xiaomei Xie
- Engineering Research Center of Edible and Medicinal Fungi, Ministry of Education, Jilin Agricultural University, Changchun, China
| | - Bu Li
- Engineering Research Center of Edible and Medicinal Fungi, Ministry of Education, Jilin Agricultural University, Changchun, China
| | - Yuguang Fan
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, College of Pharmacy, Hainan Medical University, Haikou, China
| | - Renhe Duan
- Engineering Research Center of Edible and Medicinal Fungi, Ministry of Education, Jilin Agricultural University, Changchun, China
| | - Chonghua Gao
- Engineering Research Center of Edible and Medicinal Fungi, Ministry of Education, Jilin Agricultural University, Changchun, China
| | - Yuan Zheng
- Engineering Research Center of Edible and Medicinal Fungi, Ministry of Education, Jilin Agricultural University, Changchun, China
| | - Enjing Tian
- Engineering Research Center of Edible and Medicinal Fungi, Ministry of Education, Jilin Agricultural University, Changchun, China
- *Correspondence: Enjing Tian,
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Rapid Russula senecis identification assays using loop-mediated isothermal amplification based on real-time fluorescence and visualization. Appl Microbiol Biotechnol 2022; 106:1227-1239. [DOI: 10.1007/s00253-022-11774-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 01/03/2022] [Accepted: 01/09/2022] [Indexed: 12/28/2022]
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5
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Piarroux R, Gabriel F, Grenouillet F, Collombon P, Louasse P, Piarroux M, Normand AC. Using MALDI-ToF mass spectrometry to identify mushroom species: Proof of concept analysis of Amanita genus specimens. Med Mycol 2021; 59:890-900. [PMID: 33891700 DOI: 10.1093/mmy/myab018] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 02/18/2021] [Accepted: 03/09/2021] [Indexed: 11/15/2022] Open
Abstract
Food poisoning caused by toxic mushrooms, such as species in the Amanita genus, occurs frequently around the world. To properly treat these patients, it is important to rapidly and accurately identify the causal species. Matrix-assisted laser desorption/ionization time-of-flight (MALDI-ToF) mass spectrometry is a rapid technique that has been used in medical laboratories for the past three decades to identify bacteria, yeasts, and filamentous fungi.Matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-Tof MS) is a rapid method used for the past three decades to identify microorganisms. In this study, we created and internally validated a MALDI-Tof MS reference database comprising 15 Amanita species frequently encountered in France, and we challenged this database with 38 Amanita specimens from four French locations, using a free online application for MALDI-ToF spectra identifications.Assessment of the database showed that mass spectra can be obtained by analyzing any portion of a carpophore and that all portions enabled identification of the carpophore at the species level. Most carpophores were correctly identified using our database, with the exception of specimens from the Vaginatae section. Decay tests also demonstrated that decayed portions (like those found in the kitchen garbage can) of Amanita phalloides mushrooms could be properly identified using MALDI-ToF MS.Our findings provide important insight for toxicology laboratories that often rely on DNA sequencing to identify meal leftovers implicated in food poisoning. In future developments, this technique could also be used to detect counterfeit mushrooms by including other genera in the reference database. LAY SUMMARY MALDI-ToF MS is a powerful identification tool for microorganisms. We demonstrate that the technique can be applied to Amanita specimens. This will prevent food intoxications as a rapid and definite identification can be obtained, and it can also be used for food remnants.
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Affiliation(s)
| | - Frédéric Gabriel
- Centre Hospitalier Universitaire de Bordeaux, Service de Parasitologie Mycologie, F-33000, Bordeaux, France
| | - Frédéric Grenouillet
- Department of Parasitology and Mycology, University Hospital of Besançon, F-25000, Besançon, France
| | - Patrick Collombon
- Société de Mycologie de Provence, Laboratoire de Botanique - Faculté des Sciences Saint-Charles, F-13331, Marseille, France
| | | | - Martine Piarroux
- Ministère des armées, Centre d'épidémiologie et de santé publique des armées (CESPA), F-13014, Marseille, Paris, France
| | - Anne-Cécile Normand
- AP-HP, Groupe Hospitalier La Pitié-Salpêtrière, Service de Parasitologie Mycologie, F-75013, Paris, France
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Wang N, Zhao Z, Gao J, Tian E, Yu W, Li H, Zhang J, Xie R, Zhao X, Chen A. Rapid and Visual Identification of Chlorophyllum molybdites With Loop-Mediated Isothermal Amplification Method. Front Microbiol 2021; 12:638315. [PMID: 33815325 PMCID: PMC8013719 DOI: 10.3389/fmicb.2021.638315] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Accepted: 02/10/2021] [Indexed: 11/14/2022] Open
Abstract
Chlorophyllum molybdites is a kind of common poisonous mushroom in China that is widely distributed in different areas. Food poisoning caused by accidentally eating C. molybdites has become more frequent in recent years. In 2019, there were 55 food poisoning incidents caused by eating this mushroom in China. Mushroom poisoning continues to be a common health issue of global concern. When mushroom poisoning occurs, an effective, simple, and rapid detection method is required for accurate clinical treatment or forensic analysis. For the first time, we established a loop-mediated isothermal amplification (LAMP) assay for the visual detection of C. molybdites. A set of specific LAMP primers was designed, and the specificity was confirmed against 43 different mushroom species. The LAMP method could detect as low as 1 pg of genomic DNA. Boiled mushrooms and artificial gastric-digested mushroom samples were prepared to test the applicability of the method, and the results showed that as low as 1% C. molybdites in boiled and digested samples could be successfully detected. The LAMP method can also be completed within 45 min, and the reaction results could be directly observed based on a color change under daylight by the naked eye. Therefore, the LAMP assay established in this study provides an accurate, sensitive, rapid, and low-cost method for the detection of C. molybdites.
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Affiliation(s)
- Nan Wang
- Institute of Quality Standard and Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Zhiyong Zhao
- Institute for Agri-food Standards and Testing Technology, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Jie Gao
- Institute of Quality Standard and Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Enjing Tian
- Institute of Mycology, Engineering Research Center of Chinese Ministry of Education for Edible and Medicinal Fungi, Jilin Agricultural University, Jilin, China
| | - Wenjie Yu
- Institute of Quality Standard and Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Hui Li
- Institute of Quality Standard and Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Juan Zhang
- Institute of Quality Standard and Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Ruibin Xie
- Institute of Quality Standard and Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xiaoyan Zhao
- Institute for Agri-food Standards and Testing Technology, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Ailiang Chen
- Institute of Quality Standard and Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
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Sharma S, Aydin M, Bansal G, Kaya E, Singh R. Determination of amatoxin concentration in heat-treated samples of Amanita phalloides by high-performance liquid chromatography: A forensic approach. J Forensic Leg Med 2021; 78:102111. [PMID: 33444994 DOI: 10.1016/j.jflm.2020.102111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 12/07/2020] [Accepted: 12/20/2020] [Indexed: 10/22/2022]
Affiliation(s)
- Spriha Sharma
- Research Fellow, Department of Forensic Science, Punjabi University, Patiala, Punjab, 147002, India.
| | - Meryem Aydin
- Research Fellow, Center of Traditional and Complementary Medicine, Duzce University, Duzce, Turkey.
| | - Gulshan Bansal
- Department of Pharmaceutical Sciences and Drug Research, Punjabi University, Patiala, Punjab, 147002, India.
| | - Ertugrul Kaya
- Department of Medical Pharmacology, Faculty of Medicine, Duzce University, Duzce, Turkey.
| | - Rajinder Singh
- Department of Forensic Science, Punjabi University, Patiala, Punjab, 147002, India.
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Arici MA, Tuncok Y. Mushroom-related toxins, alpha amanitin, and usage of antioxidants: Directions toward antioxidant capacity. Toxicology 2021. [DOI: 10.1016/b978-0-12-819092-0.00044-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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9
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Pennisi L, Lepore A, Gagliano-Candela R, Santacroce L, Charitos IA. A Report on Mushrooms Poisonings in 2018 at the Apulian Regional Poison Center. Open Access Maced J Med Sci 2020. [DOI: 10.3889/oamjms.2020.4208] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
BACKGROUND: The “Ospedali Riuniti’s Poison Center” (Foggia, Italy) provides a 24 h telephone consultation in clinical toxicology to the general public and health-care professionals, including drug information and assessment of the effects of commercial and industrial chemical substances, toxins but also plants and mushrooms. It participates in diagnosis and treatment of the exposure to toxins and toxicants, also throughout its ambulatory activity.
METHODS: To report data on the epidemiology of mushroom poisoning in people contacting our Poison Center we made computerized queries and descriptive analyses of the medical records database of the mushroom poisoning in the poison center of Foggia from January 2018 to December 2018.
RESULTS: A total of 69 mushroom poisonings cases were recorded in our poison center the period from January 2018 to December 2018. Our poison center serves all the Italian territory but most of the calls about mushrooms poisonings, in 2018, came from Apulia, Campania, and Basilicata, which are bordering regions of Italy. About 80.2 % of calls were made by the physicians (particularly, 73.9% by emergency room, 18.8% and 4.3% by hospital ward, and 1.4% both by a general practitioner and by the American Sign Language [“ASL”]) and 18.8% by the public. Cooked mushrooms were involved in all the cases (single and multiple species). The most frequent calls were made in the period between September 2018 and December 2018; in the other months, there were only sporadic cases. All were intentional exposures in adults (>18 years).
CONCLUSIONS: Mushroom exposures and poisonings are an important problem in those regions of Italy where many people adventuring in mushroom’s research without any license. This fact has contributed substantially to morbidity due to mushroom poisoning. Our database is a valuable national resource for the collection and monitoring of Italian mushroom poisoning cases in 2018 but limited to the people who called our poison center, which is one of the nine poisons centers in Italy. And since in most cases, the mushroom’s species remains unknown, it is important to quickly recognize symptoms and most frequent species involved on the Italian territory, in particular in South Italy.
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Arenas M, Pereira F, Oliveira M, Pinto N, Lopes AM, Gomes V, Carracedo A, Amorim A. Forensic genetics and genomics: Much more than just a human affair. PLoS Genet 2017; 13:e1006960. [PMID: 28934201 PMCID: PMC5608170 DOI: 10.1371/journal.pgen.1006960] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
While traditional forensic genetics has been oriented towards using human DNA in criminal investigation and civil court cases, it currently presents a much wider application range, including not only legal situations sensu stricto but also and, increasingly often, to preemptively avoid judicial processes. Despite some difficulties, current forensic genetics is progressively incorporating the analysis of nonhuman genetic material to a greater extent. The analysis of this material-including other animal species, plants, or microorganisms-is now broadly used, providing ancillary evidence in criminalistics in cases such as animal attacks, trafficking of species, bioterrorism and biocrimes, and identification of fraudulent food composition, among many others. Here, we explore how nonhuman forensic genetics is being revolutionized by the increasing variety of genetic markers, the establishment of faster, less error-burdened and cheaper sequencing technologies, and the emergence and improvement of models, methods, and bioinformatics facilities.
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Affiliation(s)
- Miguel Arenas
- Department of Biochemistry, Genetics and Immunology, University of Vigo, Vigo, Spain
- Instituto de Investigação e Inovação em Saúde (i3S), University of Porto, Porto, Portugal
- Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Porto, Portugal
| | - Filipe Pereira
- Instituto de Investigação e Inovação em Saúde (i3S), University of Porto, Porto, Portugal
- Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), University of Porto, Porto, Portugal
| | - Manuela Oliveira
- Instituto de Investigação e Inovação em Saúde (i3S), University of Porto, Porto, Portugal
- Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Porto, Portugal
- Faculty of Sciences, University of Porto, Porto, Portugal
| | - Nadia Pinto
- Instituto de Investigação e Inovação em Saúde (i3S), University of Porto, Porto, Portugal
- Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Porto, Portugal
- Centre of Mathematics of the University of Porto, Porto, Portugal
| | - Alexandra M. Lopes
- Instituto de Investigação e Inovação em Saúde (i3S), University of Porto, Porto, Portugal
- Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Porto, Portugal
| | - Veronica Gomes
- Instituto de Investigação e Inovação em Saúde (i3S), University of Porto, Porto, Portugal
- Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Porto, Portugal
| | - Angel Carracedo
- Institute of Forensic Sciences Luis Concheiro, University of Santiago de Compostela, Santiago de Compostela, Spain
- Genomics Medicine Group, CIBERER, University of Santiago de Compostela, Santiago de Compostela, Spain
| | - Antonio Amorim
- Instituto de Investigação e Inovação em Saúde (i3S), University of Porto, Porto, Portugal
- Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Porto, Portugal
- Faculty of Sciences, University of Porto, Porto, Portugal
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Kikkawa HS, Tsuge K, Kubota S, Aragane M, Ohta H, Sugita R. Species identification of white false hellebore (Veratrum album subsp. oxysepalum) using real-time PCR. Forensic Sci Int 2017; 275:160-166. [PMID: 28366623 DOI: 10.1016/j.forsciint.2017.02.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 12/30/2016] [Accepted: 02/02/2017] [Indexed: 10/19/2022]
Abstract
Food poisoning is frequently caused by the accidental ingestion of toxic plants that possess strong morphological similarities to edible plants. False helleborine (Veratrum album) is one of the most common plants involved in such accidents. In cases of poisoning by toxic plants, rapid and accurate identification, usually based on the morphological or chemical analysis of plant parts, is required for appropriate medical treatment or forensic investigation. However, morphological examinations require experience in systematic botany because the samples are fragmentary, and chemical analysis of natural compounds can be difficult. In this study, we developed a TaqMan real-time PCR method using trnH-psbA and trnL-trnF that could be carried out in 30-60min. The lower detection limit was less than 10pg of DNA and the primer sets were specific to V. album and Veratrum stamineum. Mixed samples, cooked samples, and simulated gastric contents were successfully identified, and a multiplex assay of two regions was also possible. These results indicate that the TaqMan real-time PCR analysis is a very effective method to detect small samples of V. album and V. stamineum accurately and rapidly in poisoning cases.
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Affiliation(s)
- Hitomi S Kikkawa
- National Research Institute of Police Science, 6-3-1 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan.
| | - Kouichiro Tsuge
- National Research Institute of Police Science, 6-3-1 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
| | - Satoshi Kubota
- National Research Institute of Police Science, 6-3-1 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
| | - Masako Aragane
- Medical Plant Garden, Tokyo Metropolitan Institute of Public Health, 21-1 Nakajimacho, Kodaira, Tokyo 187-0033, Japan
| | - Hikoto Ohta
- National Research Institute of Police Science, 6-3-1 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
| | - Ritsuko Sugita
- National Research Institute of Police Science, 6-3-1 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
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Morel S, Fons F, Rapior S, Dubois V, Vitou M, Portet K, Dore JC, Poucheret P. Decision-Making for the Detection of Amatoxin Poisoning: A Comparative Study of Standard Analytical Methods. CRYPTOGAMIE MYCOL 2016. [DOI: 10.7872/crym/v37.iss2.2016.217] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Strauss BB, Yab TC, O'Connor HM, Taylor WR, Mahoney DW, Simonson JA, Christensen J, Chari ST, Ahlquist DA. Fecal Recovery of Ingested Cellular DNA: Implications for Noninvasive Detection of Upper Gastrointestinal Neoplasms. Dig Dis Sci 2016; 61:117-25. [PMID: 26297132 DOI: 10.1007/s10620-015-3845-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Accepted: 08/04/2015] [Indexed: 12/18/2022]
Abstract
BACKGROUND Stool DNA testing represents a potential noninvasive approach to detect upper gastrointestinal (UGI) neoplasms. However, little is known about fecal recovery efficiency of DNA exfoliated from UGI tumors. AIMS The purpose of this study was to establish a human ingestion model that quantitatively approximates daily cellular shedding from UGI neoplasms and to estimate fecal DNA marker recovery rates. METHODS Healthy volunteers (n = 10) ingested two scheduled doses of raw salmon, 0.3 and 30 g, simulating the mass exfoliated daily from 1 to 4.5 cm lesions. To approach a steady-state, each dose was ingested over three consecutive days in randomized order. Following defecation of an indicator dye ingested with test meals, stools were collected over 48 h. Ingested salmon DNA was captured from stools using probes targeting pathognomonic Salmonidae sequences (SlmII). Captured DNA was quantified using PCR primers to generate 178, 138, 88 and 55 bp amplicons. RESULTS SlmII sequences were recovered from all stools following salmon ingestion; recovery was proportional to amount ingested (p = 0.004). Fecal recovery of ingested salmon varied inversely with amplicon size targeted; mean recovery rates of SlmII were 0.49, 0.91, 3.63, and 7.31 copies per 100,000 copies ingested for 178, 134, 88, and 55 bp amplicons, respectively (p < 0.0001). Longer oro-anal transit was associated with reduced recovery. CONCLUSIONS While recovery efficiencies are low, ingested cellular DNA simulating daily amounts shed from UGI tumors can readily be detected in stool. Assay of shorter-fragment analyte increases recovery. This ingestion model has potential value in studying the effects of perturbations relevant to the fecal recovery of DNA exfoliated from UGI tumors.
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Affiliation(s)
- Benjamin B Strauss
- Division of Gastroenterology and Hepatology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55901, USA.
| | - Tracy C Yab
- Division of Gastroenterology and Hepatology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55901, USA.
| | - Helen M O'Connor
- Division of Gastroenterology and Hepatology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55901, USA.
- Center for Clinical and Translational Science, Mayo Clinic, Rochester, MN, USA.
| | - William R Taylor
- Division of Gastroenterology and Hepatology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55901, USA.
| | - Douglas W Mahoney
- Biomedical Statistics and Informatics, Mayo Clinic, Rochester, MN, USA.
| | - Julie A Simonson
- Division of Gastroenterology and Hepatology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55901, USA.
| | - John Christensen
- Division of Gastroenterology and Hepatology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55901, USA
| | - Suresh T Chari
- Division of Gastroenterology and Hepatology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55901, USA.
| | - David A Ahlquist
- Division of Gastroenterology and Hepatology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55901, USA.
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Bazzle LJ, Cubeta MA, Marks SL, Dorman DC. Feasibility of flotation concentration of fungal spores as a method to identify toxigenic mushrooms. VETERINARY MEDICINE-RESEARCH AND REPORTS 2014; 6:1-9. [PMID: 30101091 PMCID: PMC6067785 DOI: 10.2147/vmrr.s67794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Purpose Mushroom poisoning is a recurring and challenging problem in veterinary medicine. Diagnosis of mushroom exposure in animals is hampered by the lack of rapid diagnostic tests. Our study evaluated the feasibility of using flotation concentration and microscopic evaluation of spores for mushroom identification. Evaluation of this method in living animals exposed to toxigenic mushrooms is limited by ethical constraints; therefore, we relied upon the use of an in vitro model that mimics the oral and gastric phases of digestion. Methods In our study, mycologist-identified toxigenic (poisonous) and nontoxigenic fresh mushrooms were collected in North Carolina, USA. In phase 1, quantitative spore recovery rates were determined following magnesium sulfate, modified Sheather’s sugar solution, and zinc sulfate flotation (n=16 fungal species). In phase 2, mushrooms (n=40 fungal species) were macerated and digested for up to 2 hours in a salivary and gastric juice simulant. The partially digested material was acid neutralized, filtered, and spores concentrated using zinc sulfate flotation followed by microscopic evaluation of spore morphology. Results Mean spore recovery rates for the three flotation fluids ranged from 32.5% to 41.0% (P=0.82). Mean (± standard error of the mean) Amanita spp. spore recovery rates were 38.1%±3.4%, 36.9%±8.6%, and 74.5%±1.6% (P=0.0012) for the magnesium sulfate, Sheather’s sugar, and zinc sulfate solutions, respectively. Zinc sulfate flotation following in vitro acid digestion (phase 2) yielded spore numbers adequate for microscopic visualization in 97.5% of trials. The most common spore shapes observed were globose, spiked, elliptical, smooth and reticulate. Conclusion Flotation can concentrate mushroom spores; however, false negative results can occur. Spore morphology could not be used to differentiate species of mushroom-forming fungi since the spore shape and surface characteristics seen in the present study were often observed with multiple species of mushroom-forming fungi.
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Affiliation(s)
- Lisa J Bazzle
- Department of Clinical Sciences, College of Veterinary Medicine
| | - Marc A Cubeta
- Department of Plant Pathology, College of Agriculture and Life Sciences, Center for Integrated Fungal Research
| | - Steven L Marks
- Department of Clinical Sciences, College of Veterinary Medicine
| | - David C Dorman
- Department of Molecular and Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA,
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