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Phillips JD, Griswold CK, Young RG, Hubert N, Hanner RH. A Measure of the DNA Barcode Gap for Applied and Basic Research. Methods Mol Biol 2024; 2744:375-390. [PMID: 38683332 DOI: 10.1007/978-1-0716-3581-0_24] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2024]
Abstract
DNA barcoding has largely established itself as a mainstay for rapid molecular taxonomic identification in both academic and applied research. The use of DNA barcoding as a molecular identification method depends on a "DNA barcode gap"-the separation between the maximum within-species difference and the minimum between-species difference. Previous work indicates the presence of a gap hinges on sampling effort for focal taxa and their close relatives. Furthermore, both theory and empirical work indicate a gap may not occur for related pairs of biological species. Here, we present a novel evaluation approach in the form of an easily calculated set of nonparametric metrics to quantify the extent of proportional overlap in inter- and intraspecific distributions of pairwise differences among target species and their conspecifics. The metrics are based on a simple count of the number of overlapping records for a species falling within the bounds of maximum intraspecific distance and minimum interspecific distance. Our approach takes advantage of the asymmetric directionality inherent in pairwise genetic distance distributions, which has not been previously done in the DNA barcoding literature. We apply the metrics to the predatory diving beetle genus Agabus as a case study because this group poses significant identification challenges due to its morphological uniformity despite both relative sampling ease and well-established taxonomy. Results herein show that target species and their nearest neighbor species were found to be tightly clustered and therefore difficult to distinguish. Such findings demonstrate that DNA barcoding can fail to fully resolve species in certain cases. Moving forward, we suggest the implementation of the proposed metrics be integrated into a common framework to be reported in any study that uses DNA barcoding for identification. In so doing, the importance of the DNA barcode gap and its components for the success of DNA-based identification using DNA barcodes can be better appreciated.
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Affiliation(s)
- Jarrett D Phillips
- School of Computer Science, University of Guelph, Guelph, ON, Canada.
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada.
| | - Cortland K Griswold
- School of Computer Science, University of Guelph, Guelph, ON, Canada
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
| | - Robert G Young
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
| | - Nicolas Hubert
- UMR ISEM (IRD, UM, CNRS), Université de Montpellier, Montpellier, France
| | - Robert H Hanner
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
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Suwannasai N, Sangvichien E, Phosri C, McCloskey S, Wangsawat N, Thamvithayakorn P, Ruchikachorn N, Thienhirun S, Mekkamol S, Sihanonth P, Whalley MA, Whalley AJS. Exploring the Xylariaceae and its relatives. Bot Stud 2023; 64:15. [PMID: 37382773 PMCID: PMC10310687 DOI: 10.1186/s40529-023-00389-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 05/18/2023] [Indexed: 06/30/2023]
Abstract
The Xylariaceae and its relatives rank as one of the best-known members of the Ascomycota. They are now well recognized for their diversity, global distribution, ecological activities and their outstanding novel metabolites with wide ranging bioactivity.
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Affiliation(s)
- Nuttika Suwannasai
- Department of Microbiology, Faculty of Science, Srinakharinwirot University, 114 Sukhumvit 23, Wattana District, Bangkok, 10110, Thailand
| | - Ek Sangvichien
- Department of Biology, Faculty of Science, Ramkhamhaeng University, Hua Mark Bangkapi, Bangkok, 10240, Thailand
| | - Cherdchai Phosri
- Department of Biology, Faculty of Science, Nakhon Phanom University, Nakhon Phanom, 48000, Thailand
| | - Sirirath McCloskey
- National Products Research Unit, Centre of Excellence for Innovation in Chemistry (PERCH-CIC), Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Niwana Wangsawat
- Department of Microbiology, Faculty of Science, Srinakharinwirot University, 114 Sukhumvit 23, Wattana District, Bangkok, 10110, Thailand
- Food Research Unit, CPF Food Research and Development Center, 359 Moo 4 Wang Noi, Phra Nakhon Si Ayutthaya, 13170, Thailand
- National Centre for Genetic Engineering and Biotechnology, 113 Thailand Science Park, Phahonyothin Road, Khlong Luang, Bangkok, 12120, Pathumthani, Thailand
| | - Pisit Thamvithayakorn
- Department of Microbiology, Faculty of Science, Srinakharinwirot University, 114 Sukhumvit 23, Wattana District, Bangkok, 10110, Thailand
| | - Nutthaporn Ruchikachorn
- The Institute for the Promotion of Teaching Science and Technology (IPST), 924 Sukhumvit Road, Phra Khanong Subdistrict, Klong Toei District, Bangkok, 10110, Thailand
| | - Surang Thienhirun
- Department of Royal Forest, Forest Products Research Division, Bangkok, 10900, Thailand
| | - Sureewan Mekkamol
- Plant Protection Program, Faculty of Agricultural Production, Maejo University, 63 Sansai-Phrao Road, Nongharn, Sansai District, Chiang Mai, 50290, Thailand
| | - Prakitsin Sihanonth
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Margaret A Whalley
- School of Pharmacy and Biomolecular Science, Liverpool John Moore University, Liverpool, L3 3AF, UK
| | - Anthony J S Whalley
- School of Pharmacy and Biomolecular Science, Liverpool John Moore University, Liverpool, L3 3AF, UK.
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Freire-Rallo S, Wedin M, Diederich P, Millanes AM. To explore strange new worlds - The diversification in Tremella caloplacae was linked to the adaptive radiation of the Teloschistaceae. Mol Phylogenet Evol 2023; 180:107680. [PMID: 36572164 DOI: 10.1016/j.ympev.2022.107680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 09/12/2022] [Accepted: 12/15/2022] [Indexed: 12/24/2022]
Abstract
Lichenicolous fungi are a heterogeneous group of organisms that grow exclusively on lichens, forming obligate associations with them. It has often been assumed that cospeciation has occurred between lichens and lichenicolous fungi, but this has been seldom analysed from a macroevolutionary perspective. Many lichenicolous species are rare or are rarely observed, which results in frequent and large gaps in the knowledge of the diversity of many groups. This, in turn, hampers evolutionary studies that necessarily are based on a reasonable knowledge of this diversity. Tremella caloplacae is a heterobasidiomycete growing on various hosts from the lichen-forming family Teloschistaceae, and evidence suggests that it may represent a species complex. We combine an exhaustive sampling with molecular and ecological data to study species delimitation, cophylogenetic events and temporal concordance of this association. Tremella caloplacae is here shown to include at least six distinct host-specific lineages (=putative species). Host switch is the dominant and most plausible event influencing diversification and explaining the coupled evolutionary history in this system, although cospeciation cannot be discarded. Speciation in T. caloplacae would therefore have occurred coinciding with the rapid diversification - by an adaptive radiation starting in the late Cretaceous - of their hosts. New species in T. caloplacae would have developed as a result of specialization on diversifying lichen hosts that suddenly offered abundant new ecological niches to explore or adapt to.
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Affiliation(s)
- Sandra Freire-Rallo
- Rey Juan Carlos University/Departamento de Biología y Geología, Física y Química Inorgánica, E-28933 Móstoles, Spain
| | - Mats Wedin
- Swedish Museum of Natural History/Botany Dept., PO Box 50007, SE-10405 Stockholm, Sweden.
| | - Paul Diederich
- Musée national d'histoire naturelle, 25 rue Munster, L-2160 Luxembourg, Luxembourg
| | - Ana M Millanes
- Rey Juan Carlos University/Departamento de Biología y Geología, Física y Química Inorgánica, E-28933 Móstoles, Spain
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Wangsawat N, Ju YM, Phosri C, Whalley AJS, Suwannasai N. Twelve New Taxa of Xylaria Associated with Termite Nests and Soil from Northeast Thailand. Biology (Basel) 2021; 10:biology10070575. [PMID: 34201676 PMCID: PMC8301132 DOI: 10.3390/biology10070575] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 06/19/2021] [Accepted: 06/21/2021] [Indexed: 11/24/2022]
Abstract
Simple Summary Xylaria species are known for their medicinal value and production of a variety of bioactive compounds. They usually grow on rotten wood, fallen leaves, seeds, and fruits. Some species can be found growing on soil or associated with termite nests, which belong to subgenus Pseudoxylaria. They share with other Xylaria species a suite of morphological characteristics, including conspicuous or massive upright stromata with a light-coloured interior, a longer than wide ascal apical ring, bluing in an iodine reagent, and brown unicellular ascospores possessing a germ slit. In Thailand, there are only limited reports on Xylaria diversity and taxonomy, especially on species associated with termite nests. In the present study, we describe 12 new Xylaria taxa and report two species closely resembling known species from termite nests or soil. Their morphological and cultural characteristics are described and illustrated, and their nucleotide sequences of ITS rDNA, alpha-actin, and beta-tubulin genes were obtained. Phylogenetic inference based on these sequences confirmed that all taxa analyzed belong to subgenus Pseudoxylaria and differ from all other species with sequences available in public databases. Our study is the first to report on the novel Xylaria species associated with termite nests or growing on soil in Thailand. Subgenus Pseudoxylaria is likely highly diverse in the country. Abstract The diversity of Xylaria species associated with termite nests in northeast Thailand was investigated. Among the 14 taxa included in this study, 11 species and one variety were described as new, and another two species resemble the existing taxa, X. escharoidea and X. nigripes. The newly described taxa are X. chaiyaphumensis, X. conica, X. fulvescens, X. ischnostroma, X. margaretae, X. minima, X. reinkingii var. microspora, X. siamensis, X. sihanonthii, X. subintraflava, X. thienhirunae, and X. vinacea. Their morphological and cultural characteristics are described and illustrated, and their ITS, α-actin and β-tubulin sequences were analysed. A dichotomous key to the 17 species of Xylaria occurring in Thailand is provided.
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Affiliation(s)
- Niwana Wangsawat
- Department of Biology, Faculty of Science, Srinakharinwirot University, 114 Sukhumvit 23, Wathana, Bangkok 10110, Thailand;
| | - Yu-Ming Ju
- Institute of Plant and Microbial Biology, Academia Sinica, Nankang, Taipei 115, Taiwan;
| | - Cherdchai Phosri
- Department of Biology, Faculty of Science, Nakhon Phanom University, Nakhon Phanom 48000, Thailand;
| | - Anthony J. S. Whalley
- School of Pharmacy and Biomolecular Science, Liverpool John Moore University, Liverpool L3 3AF, UK;
| | - Nuttika Suwannasai
- Department of Microbiology, Faculty of Science, Srinakharinwirot University, 114 Sukhumvit 23, Wathana, Bangkok 10110, Thailand
- Correspondence: ; Tel.: +66-2-6495000 (ext. 18519)
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Martín MP, Daniëls PP, Erickson D, Spouge JL. Figures of merit and statistics for detecting faulty species identification with DNA barcodes: A case study in Ramaria and related fungal genera. PLoS One 2020; 15:e0237507. [PMID: 32813726 PMCID: PMC7437900 DOI: 10.1371/journal.pone.0237507] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 07/28/2020] [Indexed: 11/19/2022] Open
Abstract
DNA barcoding can identify biological species and provides an important tool in diverse applications, such as conserving species and identifying pathogens, among many others. If combined with statistical tests, DNA barcoding can focus taxonomic scrutiny onto anomalous species identifications based on morphological features. Accordingly, we put nonparametric tests into a taxonomic context to answer questions about our sequence dataset of the formal fungal barcode, the nuclear ribosomal internal transcribed spacer (ITS). For example, does DNA barcoding concur with annotated species identifications significantly better if expert taxonomists produced the annotations? Does species assignment improve significantly if sequences are restricted to lengths greater than 500 bp? Both questions require a figure of merit to measure of the accuracy of species identification, typically provided by the probability of correct identification (PCI). Many articles on DNA barcoding use variants of PCI to measure the accuracy of species identification, but do not provide the variants with names, and the absence of explicit names hinders the recognition that the different variants are not comparable from study to study. We provide four variant PCIs with a name and show that for fixed data they follow systematic inequalities. Despite custom, therefore, their comparison is at a minimum problematic. Some popular PCI variants are particularly vulnerable to errors in species annotation, insensitive to improvements in a barcoding pipeline, and unable to predict identification accuracy as a database grows, making them unsuitable for many purposes. Generally, the Fractional PCI has the best properties as a figure of merit for species identification. The fungal genus Ramaria provides unusual taxonomic difficulties. As a case study, it shows that a good taxonomic background can be combined with the pertinent summary statistics of molecular results to improve the identification of doubtful samples, linking both disciplines synergistically.
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Affiliation(s)
- María P. Martín
- Department of Mycology, Real Jardín Botánico-CSIC, Madrid, Spain
| | - Pablo P. Daniëls
- Department of Botany, Ecology and Plant Physiology, Campus Rabanales, University of Córdoba, Córdoba, Spain
| | - David Erickson
- Joint Institute of Food Safety and Applied Nutrition, University of Maryland, College Park, Maryland, United States of America
| | - John L. Spouge
- National Center for Biotechnology Information, National Library of Medicine, Bethesda, Maryland, United States of America
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Crous PW, Wingfield MJ, Chooi YH, Gilchrist CLM, Lacey E, Pitt JI, Roets F, Swart WJ, Cano-Lira JF, Valenzuela-Lopez N, Hubka V, Shivas RG, Stchigel AM, Holdom DG, Jurjević Ž, Kachalkin AV, Lebel T, Lock C, Martín MP, Tan YP, Tomashevskaya MA, Vitelli JS, Baseia IG, Bhatt VK, Brandrud TE, De Souza JT, Dima B, Lacey HJ, Lombard L, Johnston PR, Morte A, Papp V, Rodríguez A, Rodríguez-Andrade E, Semwal KC, Tegart L, Abad ZG, Akulov A, Alvarado P, Alves A, Andrade JP, Arenas F, Asenjo C, Ballarà J, Barrett MD, Berná LM, Berraf-Tebbal A, Bianchinotti MV, Bransgrove K, Burgess TI, Carmo FS, Chávez R, Čmoková A, Dearnaley JDW, de A Santiago ALCM, Freitas-Neto JF, Denman S, Douglas B, Dovana F, Eichmeier A, Esteve-Raventós F, Farid A, Fedosova AG, Ferisin G, Ferreira RJ, Ferrer A, Figueiredo CN, Figueiredo YF, Reinoso-Fuentealba CG, Garrido-Benavent I, Cañete-Gibas CF, Gil-Durán C, Glushakova AM, Gonçalves MFM, González M, Gorczak M, Gorton C, Guard FE, Guarnizo AL, Guarro J, Gutiérrez M, Hamal P, Hien LT, Hocking AD, Houbraken J, Hunter GC, Inácio CA, Jourdan M, Kapitonov VI, Kelly L, Khanh TN, Kisło K, Kiss L, Kiyashko A, Kolařík M, Kruse J, Kubátová A, Kučera V, Kučerová I, Kušan I, Lee HB, Levicán G, Lewis A, Liem NV, Liimatainen K, Lim HJ, Lyons MN, Maciá-Vicente JG, Magaña-Dueñas V, Mahiques R, Malysheva EF, Marbach PAS, Marinho P, Matočec N, McTaggart AR, Mešić A, Morin L, Muñoz-Mohedano JM, Navarro-Ródenas A, Nicolli CP, Oliveira RL, Otsing E, Ovrebo CL, Pankratov TA, Paños A, Paz-Conde A, Pérez-Sierra A, Phosri C, Pintos Á, Pošta A, Prencipe S, Rubio E, Saitta A, Sales LS, Sanhueza L, Shuttleworth LA, Smith J, Smith ME, Spadaro D, Spetik M, Sochor M, Sochorová Z, Sousa JO, Suwannasai N, Tedersoo L, Thanh HM, Thao LD, Tkalčec Z, Vaghefi N, Venzhik AS, Verbeken A, Vizzini A, Voyron S, Wainhouse M, Whalley AJS, Wrzosek M, Zapata M, Zeil-Rolfe I, Groenewald JZ. Fungal Planet description sheets: 1042-1111. Persoonia 2020; 44:301-459. [PMID: 33116344 DOI: 10.3767/persoonia.2020.44.11] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 05/30/2020] [Indexed: 12/31/2022]
Abstract
Novel species of fungi described in this study include those from various countries as follows: Antarctica, Cladosporium arenosum from marine sediment sand. Argentina, Kosmimatamyces alatophylus (incl. Kosmimatamyces gen. nov.) from soil. Australia, Aspergillus banksianus, Aspergillus kumbius, Aspergillus luteorubrus, Aspergillus malvicolor and Aspergillus nanangensis from soil, Erysiphe medicaginis from leaves of Medicago polymorpha, Hymenotorrendiella communis on leaf litter of Eucalyptus bicostata, Lactifluus albopicri and Lactifluus austropiperatus on soil, Macalpinomyces collinsiae on Eriachne benthamii, Marasmius vagus on soil, Microdochium dawsoniorum from leaves of Sporobolus natalensis, Neopestalotiopsis nebuloides from leaves of Sporobolus elongatus, Pestalotiopsis etonensis from leaves of Sporobolus jacquemontii, Phytophthora personensis from soil associated with dying Grevillea mccutcheonii.Brazil, Aspergillus oxumiae from soil, Calvatia baixaverdensis on soil, Geastrum calycicoriaceum on leaf litter, Greeneria kielmeyerae on leaf spots of Kielmeyera coriacea. Chile, Phytophthora aysenensis on collar rot and stem of Aristotelia chilensis.Croatia, Mollisia gibbospora on fallen branch of Fagus sylvatica.Czech Republic, Neosetophoma hnaniceana from Buxus sempervirens.Ecuador, Exophiala frigidotolerans from soil. Estonia, Elaphomyces bucholtzii in soil. France, Venturia paralias from leaves of Euphorbia paralias.India, Cortinarius balteatoindicus and Cortinarius ulkhagarhiensis on leaf litter. Indonesia, Hymenotorrendiella indonesiana on Eucalyptus urophylla leaf litter. Italy, Penicillium taurinense from indoor chestnut mill. Malaysia, Hemileucoglossum kelabitense on soil, Satchmopsis pini on dead needles of Pinus tecunumanii.Poland, Lecanicillium praecognitum on insects’ frass. Portugal, Neodevriesia aestuarina from saline water. Republic of Korea, Gongronella namwonensis from freshwater. Russia, Candida pellucida from Exomias pellucidus, Heterocephalacria septentrionalis as endophyte from Cladonia rangiferina, Vishniacozyma phoenicis from dates fruit, Volvariella paludosa from swamp. Slovenia, Mallocybe crassivelata on soil. South Africa, Beltraniella podocarpi, Hamatocanthoscypha podocarpi, Coleophoma podocarpi and Nothoseiridium podocarpi (incl. Nothoseiridium gen. nov.) from leaves of Podocarpus latifolius, Gyrothrix encephalarti from leaves of Encephalartos sp., Paraphyton cutaneum from skin of human patient, Phacidiella alsophilae from leaves of Alsophila capensis, and Satchmopsis metrosideri on leaf litter of Metrosideros excelsa.Spain, Cladophialophora cabanerensis from soil, Cortinarius paezii on soil, Cylindrium magnoliae from leaves of Magnolia grandiflora, Trichophoma cylindrospora (incl. Trichophoma gen. nov.) from plant debris, Tuber alcaracense in calcareus soil, Tuber buendiae in calcareus soil. Thailand, Annulohypoxylon spougei on corticated wood, Poaceascoma filiforme from leaves of unknown Poaceae.UK, Dendrostoma luteum on branch lesions of Castanea sativa, Ypsilina buttingtonensis from heartwood of Quercus sp. Ukraine, Myrmecridium phragmiticola from leaves of Phragmites australis.USA, Absidia pararepens from air, Juncomyces californiensis (incl. Juncomyces gen. nov.) from leaves of Juncus effusus, Montagnula cylindrospora from a human skin sample, Muriphila oklahomaensis (incl. Muriphila gen. nov.) on outside wall of alcohol distillery, Neofabraea eucalyptorum from leaves of Eucalyptus macrandra, Diabolocovidia claustri (incl. Diabolocovidia gen. nov.) from leaves of Serenoa repens, Paecilomyces penicilliformis from air, Pseudopezicula betulae from leaves of leaf spots of Populus tremuloides. Vietnam, Diaporthe durionigena on branches of Durio zibethinus and Roridomyces pseudoirritans on rotten wood. Morphological and culture characteristics are supported by DNA barcodes.
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Thamvithayakorn P, Phosri C, Pisutpaisal N, Krajangsang S, Whalley AJS, Suwannasai N. Utilization of oil palm decanter cake for valuable laccase and manganese peroxidase enzyme production from a novel white-rot fungus, Pseudolagarobasidium sp. PP17-33. 3 Biotech 2019; 9:417. [PMID: 31696022 DOI: 10.1007/s13205-019-1945-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 10/10/2019] [Indexed: 10/25/2022] Open
Abstract
Oil palm decanter cake (OPDC) in the current study was converted to valuable products as laccase and manganese peroxidase (MnP) by an undescribed strain of the white-rot fungus, Pseudolagarobasidium sp. PP17-33. The optimization to enhance the production of enzymes through solid-state fermentation was performed using Plackett-Burman design and response surface methodology. The highest observed laccase was 5.841 U/gds and observed MnP was 5.156 U/gds, which enhanced yield by 2.59-fold and 1.94-fold from the non-optimization. The optimized medium (mg/g of OPDC) consisted of 0.852 mg CuSO4·5H2O, 13.512 mg glucose, 2 mg yeast extract, 0.2 mg KH2PO4, 1.5 mg MgSO4·7H2O, 0.01 mg FeSO4·7H2O, 0.15 mg MnSO4·H2O, 0.01 mg ZnSO4·7H2O and 0.3 mg Tween 80 (pH 5.0) when incubated at 30 °C for 7 days. The most significant variables of laccase and MnP productions were CuSO4·5H2O and glucose concentrations. This study is the first to report on the production of ligninolytic enzymes from OPDC waste using white-rot fungi. In addition, five different white-rot fungi, Coriolopsis aspera, C. retropicta, Dentipellis parmastoi, Nigroporus vinosus and Tyromyces xuchilensis, are newly observed producers of ligninolytic enzymes in Thailand. The results obtained from this study are significant not only for agro-industrial waste management but also for value-added enzyme production.
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Deng Y, Hsiang T, Li S, Lin L, Wang Q, Chen Q, Xie B, Ming R. Comparison of the Mitochondrial Genome Sequences of Six Annulohypoxylon stygium Isolates Suggests Short Fragment Insertions as a Potential Factor Leading to Larger Genomic Size. Front Microbiol 2018; 9:2079. [PMID: 30250455 PMCID: PMC6140425 DOI: 10.3389/fmicb.2018.02079] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 08/14/2018] [Indexed: 12/22/2022] Open
Abstract
Mitochondrial DNA (mtDNA) is a core non-nuclear genetic material found in all eukaryotic organisms, the size of which varies extensively in the eumycota, even within species. In this study, mitochondrial genomes of six isolates of Annulohypoxylon stygium (Lév.) were assembled from raw reads from PacBio and Illumina sequencing. The diversity of genomic structures, conserved genes, intergenic regions and introns were analyzed and compared. Genome sizes ranged from 132 to 147 kb and contained the same sets of conserved protein-coding, tRNA and rRNA genes and shared the same gene arrangements and orientation. In addition, most intergenic regions were homogeneous and had similar sizes except for the region between cytochrome b (cob) and cytochrome c oxidase I (cox1) genes which ranged from 2,998 to 8,039 bp among the six isolates. Sixty-five intron insertion sites and 99 different introns were detected in these genomes. Each genome contained 45 or more introns, which varied in distribution and content. Introns from homologous insertion sites also showed high diversity in size, type and content. Comparison of introns at the same loci showed some complex introns, such as twintrons and ORF-less introns. There were 44 short fragment insertions detected within introns, intergenic regions, or as introns, some of them located at conserved domain regions of homing endonuclease genes. Insertions of short fragments such as small inverted repeats might affect or hinder the movement of introns, and these allowed for intron accumulation in the mitochondrial genomes analyzed, and enlarged their size. This study showed that the evolution of fungal mitochondrial introns is complex, and the results suggest short fragment insertions as a potential factor leading to larger mitochondrial genomes in A. stygium.
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Affiliation(s)
- Youjin Deng
- Center for Genomics and Biotechnology, Haixia Institute of Science and Technology, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL, United States
| | - Tom Hsiang
- Environmental Sciences, University of Guelph, Guelph, ON, Canada
| | - Shuxian Li
- USDA-Agricultural Research Service, Crop Genetics Research Unit, Stoneville, MS, United States
| | - Longji Lin
- Center for Genomics and Biotechnology, Haixia Institute of Science and Technology, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Qingfu Wang
- Center for Genomics and Biotechnology, Haixia Institute of Science and Technology, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Qinghe Chen
- Center for Genomics and Biotechnology, Haixia Institute of Science and Technology, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL, United States
| | - Baogui Xie
- Center for Genomics and Biotechnology, Haixia Institute of Science and Technology, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Ray Ming
- Center for Genomics and Biotechnology, Haixia Institute of Science and Technology, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL, United States
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Maciel OMC, Tavares RSN, Caluz DRE, Gaspar LR, Debonsi HM. Photoprotective potential of metabolites isolated from algae-associated fungi Annulohypoxylon stygium. J Photochem Photobiol B 2017; 178:316-322. [PMID: 29175758 DOI: 10.1016/j.jphotobiol.2017.11.018] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Revised: 10/31/2017] [Accepted: 11/12/2017] [Indexed: 11/28/2022]
Abstract
Natural products, or secondary metabolites, obtained from fungal species associated with marine algae have been widely used in sunscreens due to their antioxidant activity and protective potential against solar radiation. The endophytic fungus isolated from Bostrychia radicans algae collected in the Rio Escuro mangrove, São Paulo State, Brazil, Annulohypoxylon stygium (Xylariaceae family) was studied to evaluate the photoprotective potential of its metabolites. The Annulohypoxylon genus can produce secondary metabolites with interesting cytotoxic, antibacterial and antioxidant properties and was never isolated before from a marine alga or had its metabolites studied for UV protection. The fungal culture (code As) extracted with dichloromethane: methanol (2:1) yielded 9 fractions (Asa to Asi) which were submitted to different chromatographic methodologies to obtain pure compounds, and to spectroscopic methodologies to elucidate their structures. Also, a screening was conducted to evaluate the qualitative production of the metabolites, besides the absorption in the UVA/UVB range, their photostability and phototoxicity potential using the 3T3 NRU phototoxicity test (OECD TG 432). This study led to the isolation of a novel compound, 3-benzylidene-2-methylhexahydropyrrolo [1,2-α] pyrazine-1,4-dione (1), from fractions Ase3 and Asf3; Ase1 was identified as 1-(1,3-Benzodioxol-5-yl)-1,2-propanediol (2), two metabolites were isolated as diastereomers (1S,2R)-1-phenyl-1,2-propanediol (3) from Asd2 and (1R,2R)-1-phenyl-1,2-propanediol (4) from Asd3, and Ase1 and 1,3-benzodioxole-5-methanol (5) from Asc1. The results obtained showed a great potential source of new molecules to be used as UVB filters in sunscreens, since substances 1-2 presented UVB absorption, had no phototoxic potential and were considered photostable. In conclusion, these compounds can be considered as a potential new class of molecules for photoprotection, since their photosafety and non-cytotoxicity were predicted using in vitro methods for topical use. Meanwhile, further efficacy assays shall be conducted for the establishment of their Sun Protection Factor (SPF). Also, this work provided new information concerning the metabolic profile of A. stygium, since it was possible to obtain two enantiomer compounds (3) and (4). One of them belonged to the same skeleton, but with a methylenedioxy moiety, showing the richest enzymatic pattern for this microorganism.
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Affiliation(s)
- Olívia Maria Campanini Maciel
- Department of Physics and Chemistry, School of Pharmaceutical Sciences of Ribeirão Preto - University of Sao Paulo, Ribeirao Preto, Brazil
| | - Renata Spagolla Napoleão Tavares
- Department of Pharmaceutical Sciences, School of Pharmaceutical Sciences of Ribeirão Preto - University of Sao Paulo, Ribeirao Preto, Brazil
| | - Daniela Ricardo Engracia Caluz
- Department of Physics and Chemistry, School of Pharmaceutical Sciences of Ribeirão Preto - University of Sao Paulo, Ribeirao Preto, Brazil
| | - Lorena Rigo Gaspar
- Department of Pharmaceutical Sciences, School of Pharmaceutical Sciences of Ribeirão Preto - University of Sao Paulo, Ribeirao Preto, Brazil
| | - Hosana Maria Debonsi
- Department of Physics and Chemistry, School of Pharmaceutical Sciences of Ribeirão Preto - University of Sao Paulo, Ribeirao Preto, Brazil.
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Shaw JJ, Berbasova T, Sasaki T, Jefferson-George K, Spakowicz DJ, Dunican BF, Portero CE, Narváez-Trujillo A, Strobel SA. Identification of a fungal 1,8-cineole synthase from Hypoxylon sp. with specificity determinants in common with the plant synthases. J Biol Chem 2015; 290:8511-26. [PMID: 25648891 DOI: 10.1074/jbc.m114.636159] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Terpenes are an important and diverse class of secondary metabolites widely produced by fungi. Volatile compound screening of a fungal endophyte collection revealed a number of isolates in the family Xylariaceae, producing a series of terpene molecules, including 1,8-cineole. This compound is a commercially important component of eucalyptus oil used in pharmaceutical applications and has been explored as a potential biofuel additive. The genes that produce terpene molecules, such as 1,8-cineole, have been little explored in fungi, providing an opportunity to explore the biosynthetic origin of these compounds. Through genome sequencing of cineole-producing isolate E7406B, we were able to identify 11 new terpene synthase genes. Expressing a subset of these genes in Escherichia coli allowed identification of the hyp3 gene, responsible for 1,8-cineole biosynthesis, the first monoterpene synthase discovered in fungi. In a striking example of convergent evolution, mutational analysis of this terpene synthase revealed an active site asparagine critical for water capture and specificity during cineole synthesis, the same mechanism used in an unrelated plant homologue. These studies have provided insight into the evolutionary relationship of fungal terpene synthases to those in plants and bacteria and further established fungi as a relatively untapped source of this important and diverse class of compounds.
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Affiliation(s)
- Jeffrey J Shaw
- From the Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520
| | - Tetyana Berbasova
- From the Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520
| | - Tomoaki Sasaki
- From the Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520
| | - Kyra Jefferson-George
- the Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, and
| | - Daniel J Spakowicz
- From the Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520
| | - Brian F Dunican
- From the Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520
| | - Carolina E Portero
- the Laboratorio de Biotecnología Vegetal, Pontificia Universidad Católica del Ecuador, Quito 17 01 21 84, Ecuador
| | - Alexandra Narváez-Trujillo
- the Laboratorio de Biotecnología Vegetal, Pontificia Universidad Católica del Ecuador, Quito 17 01 21 84, Ecuador
| | - Scott A Strobel
- From the Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520,
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Estrada-Bárcenas DA, Vite-Garín T, Navarro-Barranco H, de la Torre-Arciniega R, Pérez-Mejía A, Rodríguez-Arellanes G, Ramirez JA, Humberto Sahaza J, Taylor ML, Toriello C. Genetic diversity of Histoplasma and Sporothrix complexes based on sequences of their ITS1-5.8S-ITS2 regions from the BOLD System. Rev Iberoam Micol 2014; 31:90-4. [DOI: 10.1016/j.riam.2013.10.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Accepted: 10/09/2013] [Indexed: 11/26/2022] Open
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Oliveira SF, Bocayuva MF, Veloso TGR, Bazzolli DMS, da Silva CC, Pereira OL, Kasuya MCM. Endophytic and mycorrhizal fungi associated with roots of endangered native orchids from the Atlantic Forest, Brazil. Mycorrhiza 2014; 24:55-64. [PMID: 23812655 DOI: 10.1007/s00572-013-0512-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Accepted: 06/10/2013] [Indexed: 05/04/2023]
Abstract
The composition and diversity of fungal communities associated with three endangered orchid species, Hadrolaelia jongheana, Hoffmannseggella caulescens, and Hoffmannseggella cinnabarina, found in different vegetation formations of the Atlantic Forest were determined by constructing clone libraries and by applying diversity and richness indices. Our results demonstrated the presence of Basidiomycetes. Sebacinales (81.61%) and Cantharellales (12.10%) were the dominant orders and are potential candidates for orchid mycorrhizal fungi. The Ascomycetes identified included the Helotiales (29.31%), Capnodiales (18.10%), and Sordariales (10.34%), among others. These orders may represent potentially endophytic fungi. A Shannon-Wiener diversity index (H') analysis showed a relatively high fungal community diversity associated with these tropical orchids. This diversity may offer greater flexibility in terms of the adaptation of the plants to changing environmental conditions and the potential facilitation of reintroduction programs. The Simpson diversity index values showed that all of the libraries included dominant species, and a LIBSHUFF analysis showed that the fungal communities were structurally different from each other, suggesting an influence of local factors on this diversity. This study offers important information for the development of conservation strategies for threatened and endemic species of Brazilian flora in an important and threatened hotspot.
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Affiliation(s)
- Sabrina Feliciano Oliveira
- Microbiology Department, Federal University of Viçosa, Peter Henry Rolfs Avenue, s/n, CEP 36570-000, Viçosa, Minas Gerais, Brazil
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Kuhnert E, Fournier J, Peršoh D, Luangsa-ard JJD, Stadler M. New Hypoxylon species from Martinique and new evidence on the molecular phylogeny of Hypoxylon based on ITS rDNA and β-tubulin data. FUNGAL DIVERS 2014; 64:181-203. [DOI: 10.1007/s13225-013-0264-3] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Ortiz R, Navarrete J, Oviedo C, Párraga M, Carrasco I, de la Vega E, Ortiz M, Blanchette RA. White rot Basidiomycetes isolated from Chiloé National Park in Los Lagos region, Chile. Antonie Van Leeuwenhoek 2013; 104:1193-203. [PMID: 24068453 DOI: 10.1007/s10482-013-0041-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 09/19/2013] [Indexed: 10/26/2022]
Abstract
Wood decomposition is an important component in forest ecosystems but information about the diversity of fungi causing decay is lacking. This is especially true for the temperate rain forests in Chile. These investigations show results of a biodiversity study of white-rot fungi in wood obtained from Chiloé National Park in Los Lagos region, Chile. Culturing from white-rotted wood followed by sequencing of the complete internal transcribed spacer region of the ribosomal DNA (rDNA) or partial large subunit region of the rDNA, identified 12 different species in the Basidiomycota. All of these fungi were characterized as white rot fungi and were identified with a BLAST match of 97 % or greater to sequences in the GenBank database. Fungi obtained were species of Phlebia, Mycoacia, Hyphodontia, Bjerkandera, Phanerochaete, Stereum, Trametes, and Ceriporiopsis. This report identifies for the first time in Chile the species Ceriporiopsis subvermispora, Hyphodontia radula, Phlebia radiata, Phanerochaete affinis, Peniophora cinerea, Stereum gausapatum, Phlebia setulosa and Phanerochaete sordida. Scanning electron microscopy was used to characterize the type of decay caused by the fungi that were isolated and a combination of selective lignin degraders and simultaneous white rot fungi were found. Fungi that cause a selective degradation of lignin are of interest for bioprocessing technologies that require modification or degradation of lignin without cellulose removal.
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Pino-Bodas R, Martín MP, Burgaz AR, Lumbsch HT. Species delimitation in Cladonia (Ascomycota): a challenge to the DNA barcoding philosophy. Mol Ecol Resour 2013; 13:1058-68. [PMID: 23437908 DOI: 10.1111/1755-0998.12086] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2012] [Revised: 01/30/2013] [Accepted: 01/31/2013] [Indexed: 01/28/2023]
Abstract
The lichen-forming fungal genus Cladonia is species-rich with approximately 500 described species. The accepted barcode for fungi (ITS rDNA) often fails in identifying Cladonia spp. In order to find other markers that, in combination with the ITS rDNA region can be used for species identification in Cladonia, we studied the loci IGS rDNA, ef1α, rpb2 and cox1. A total of 782 sequences from 36 species have been analyzed. PCR amplification success rate, intraspecific and interspecific genetic distance variation, calculated using the K2P model, and the correct identification percentage (PCI) were taken into account to assess possible barcode regions. The marker showing the least intraspecific genetic distance range was cox1, followed by ITS rDNA and ef1α. Of the five studied markers only cox1 showed a barcoding gap. The rpb2 locus showed the highest PCI values, but it was the most difficult to amplify. The highest correct identification rates using blast method were obtained with rpb2.
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Affiliation(s)
- Raquel Pino-Bodas
- Departamento Biología Vegetal 1, Facultad de Biología, Universidad Complutense de Madrid, E-28040, Madrid, Spain
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