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Kroken S, Glass NL, Taylor JW, Yoder OC, Turgeon BG. Phylogenomic analysis of type I polyketide synthase genes in pathogenic and saprobic ascomycetes. Proc Natl Acad Sci U S A 2003; 100:15670-5. [PMID: 14676319 PMCID: PMC307626 DOI: 10.1073/pnas.2532165100] [Citation(s) in RCA: 375] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Fungal type I polyketides (PKs) are synthesized by PK synthases (PKSs) and include well known secondary metabolites such as the anticholesterol drug lovastatin and the potent natural carcinogen aflatoxin. Other type I PKs are known to be virulence factors for some plant pathogens and pigments such as melanin. In this study, a phylogenomic approach was used to investigate the origin and diversity of fungal genes encoding putative PKSs that are predicted to synthesize type I PKs. The resulting genealogy, constructed by using the highly conserved PKS ketosynthase (KS) domain, indicated that: (i). Species within subphylum Pezizomycotina (phylum Ascomycota) but not early diverging ascomycetes, like Saccharomyces cerevisiae (Saccharomycotina) or Schizosaccharomyces pombe (Taphrinomycotina), had large numbers (7-25) of PKS genes. (ii). Bacteria and fungi had separate groups of PKS genes; the few exceptions are the likely result of horizontal gene transfer from bacteria to various sublineages of fungi. (iii). The bulk of genes encoding fungal PKSs fell into eight groups. Four groups were predicted to synthesize variously reduced PKs, and four groups were predicted to make unreduced PKs. (iv). Species within different classes of Pezizomycotina shared the same groups of PKS genes. (v). Different fungal genomes shared few putative orthologous PKS genes, even between closely related genomes in the same class or genus. (vi) The discontinuous distributions of orthologous PKSs among fungal species can be explained by gene duplication, divergence, and gene loss; horizontal gene transfer among fungi does not need to be invoked.
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Affiliation(s)
- Scott Kroken
- Torrey Mesa Research Institute, Syngenta, 3115 Merryfield Row, San Diego, CA 92121, USA
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53
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Grube M, Blaha J. On the phylogeny of some polyketide synthase genes in the lichenized genus Lecanora. ACTA ACUST UNITED AC 2003; 107:1419-26. [PMID: 15000242 DOI: 10.1017/s0953756203008724] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The ketosynthase domains of putative polyketide synthase (PKS) genes from 15 species in the lichenized genus Lecanora as well as three representatives of other genera were amplified and sequenced using conserved primers. A phylogenetic analysis was carried out with the corresponding amino acid sequences, including those of non-lichenized fungi. The phylogenetic hypothesis places all PKS sequences from Lecanora and the other genera in a clade of PKSs that produce complex aromatic compounds. The PKSs from Lecanora are found in two distinct clades. One of these forms a monophyletic group with PKSs producing precursors of dihydroxy naphthalenes from non-lichenized species. This includes PKSs from the L. rupicola group and several other species which are not closely related. The other clade represents at least one functionally different protein and has no close relationships with known PKSs from other fungi. A comparison between an ITS phylogeny of the species with their DNA sequences of ketosynthase domains reveals similar PKS genes in certain closely related species. Coevolution was unapparent in other clades, suggesting the presence of paralogous genes.
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Affiliation(s)
- Martin Grube
- Institut für Botanik, Karl-Franzens-Universität Graz, Austria.
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54
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Scheidegger KA, Payne GA. Unlocking the Secrets Behind Secondary Metabolism: A Review ofAspergillus flavusfrom Pathogenicity to Functional Genomics. ACTA ACUST UNITED AC 2003. [DOI: 10.1081/txr-120024100] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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55
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Quirino BF, Bent AF. Deciphering host resistance and pathogen virulence: the Arabidopsis/Pseudomonas interaction as a model. MOLECULAR PLANT PATHOLOGY 2003; 4:517-30. [PMID: 20569411 DOI: 10.1046/j.1364-3703.2003.00198.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
SUMMARY The last decade has witnessed steady progress in deciphering the molecular basis of plant disease resistance and pathogen virulence. Although contributions have been made using many different plant and pathogen species, studies of the interactions between Arabidopsis thaliana and Pseudomonas syringae have yielded a particularly significant body of information. The present review focuses on recent findings regarding R gene products and the guard hypothesis, RAR1/SGT1 and other examples where protein processing activity is implicated in disease resistance or susceptibility, the use of microarray expression profiling to generate information and experimental leads, and important molecular- and genome-level discoveries regarding P. syringae effectors that mediate bacterial virulence. The development of the Arabidopsis-Pseudomonas model system is also reviewed briefly, and we close with a discussion of characteristics to consider when selecting other pathosystems as experimentally tractable models for future research.
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Affiliation(s)
- Betania F Quirino
- Genomics and Biotecnology Program, Universidade Católica de Brasília, Brasília, DF, Brazil
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56
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Varga J, Rigó K, Kocsubé S, Farkas B, Pál K. Diversity of polyketide synthase gene sequences in Aspergillus species. Res Microbiol 2003; 154:593-600. [PMID: 14527661 DOI: 10.1016/s0923-2508(03)00169-4] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Fungal polyketide synthases are responsible for the biosynthesis of several mycotoxins and other secondary metabolites. The aim of our work was to investigate the diversity of polyketide synthases in Aspergillus species using two approaches: PCR amplification using oligonucleotide primers, and bioinformatics. Ketosynthase domain probes amplified DNA fragments of about 700 bp in each examined isolate. Sequences of these domains were aligned and analyzed by phylogenetic methods. The ketosynthase domain sequences were highly diverse indicating that they most probably represent polyketide synthases responsible for different functions. A. albertensis and A. niger ketosynthase domain sequences clustered together with sequences of genes required for pigment biosynthesis (wA) in A. nidulans and P. patulum, while the ketosynthase domain sequence of A. muricatus was most closely related to an A. parasiticus wA type domain sequence, and those of the A. ochraceus isolates formed a distinct clade on the tree. These sequences were highly homologous to an A. terreus naphthopyrone synthase gene. An Aspergillus fumigatus genomic database was also searched for ketosynthase domain sequences, which have been included in the phylogenetic analysis. Altogether 14 putative ketosynthase domain sequences were identified. Clustering of the ketosynthase domain sequences correlated well with the type of metabolites produced by the corresponding polyketide synthases. At least 8 clusters with putative ketosynthase domain sequences of unknown function have been identified. Further studies are in progress to clarify the role of some of the identified polyketide synthase genes.
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Affiliation(s)
- János Varga
- Department of Microbiology, Faculty of Sciences, University of Szeged, PO Box 533, 6701 Szeged, Hungary.
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57
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Mannhaupt G, Montrone C, Haase D, Mewes HW, Aign V, Hoheisel JD, Fartmann B, Nyakatura G, Kempken F, Maier J, Schulte U. What's in the genome of a filamentous fungus? Analysis of the Neurospora genome sequence. Nucleic Acids Res 2003; 31:1944-54. [PMID: 12655011 PMCID: PMC152809 DOI: 10.1093/nar/gkg293] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2002] [Accepted: 02/07/2003] [Indexed: 11/14/2022] Open
Abstract
The German Neurospora Genome Project has assembled sequences from ordered cosmid and BAC clones of linkage groups II and V of the genome of Neurospora crassa in 13 and 12 contigs, respectively. Including additional sequences located on other linkage groups a total of 12 Mb were subjected to a manual gene extraction and annotation process. The genome comprises a small number of repetitive elements, a low degree of segmental duplications and very few paralogous genes. The analysis of the 3218 identified open reading frames provides a first overview of the protein equipment of a filamentous fungus. Significantly, N.crassa possesses a large variety of metabolic enzymes including a substantial number of enzymes involved in the degradation of complex substrates as well as secondary metabolism. While several of these enzymes are specific for filamentous fungi many are shared exclusively with prokaryotes.
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Affiliation(s)
- Gertrud Mannhaupt
- Technical University of Munich, Department of Genome Oriented Bioinformatics, Freising-Weihenstephan, Germany
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58
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Abstract
Gibberella species are destructive plant pathogens, although many are more familiar under their Fusarium anamorph names. The recent synthesis of phylogenetic, biological, and morphological species approaches has revitalized taxonomy of a genus that was first described almost 200 years ago. Twelve sexual species of Gibberella of agricultural importance were selected for this review to represent phylogenetic, biological, and chemical diversity of the genus. Even closely related Gibberella species can differ in reproductive mode, geographic and host distribution, plant pathogenesis, and production of toxins and other biologically active metabolites. Gibberella species have proven amenable to meiotic and molecular genetic analysis; A complete genome sequence of G. zeae should soon be available. Combining gene disruption strategies with new genomics technologies for expression profiling should help plant pathologists to understand the pathological and evolutionary significance of biological and chemical diversity in Gibberella and to identify novel strategies for disease control.
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Affiliation(s)
- Anne E Desjardins
- Mycotoxin Research, National Center for Agricultural Utilization Research, USDA, ARS, 1815 North University Street, Peoria, Illinois 61604, USA
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59
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Fungal Pathogenicity Genes. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1874-5334(03)80012-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
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60
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Doytchinova IA, Taylor P, Flower DR. Proteomics in Vaccinology and Immunobiology: An Informatics Perspective of the Immunone. J Biomed Biotechnol 2003; 2003:267-290. [PMID: 14688414 PMCID: PMC521502 DOI: 10.1155/s1110724303209232] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2002] [Accepted: 12/18/2002] [Indexed: 01/02/2023] Open
Abstract
The postgenomic era, as manifest, inter alia, by proteomics, offers unparalleled opportunities for the efficient discovery of safe, efficacious, and novel subunit vaccines targeting a tranche of modern major diseases. A negative corollary of this opportunity is the risk of becoming overwhelmed by this embarrassment of riches. Informatics techniques, working to address issues of both data management and through prediction to shortcut the experimental process, can be of enormous benefit in leveraging the proteomic revolution. In this disquisition, we evaluate proteomic approaches to the discovery of subunit vaccines, focussing on viral, bacterial, fungal, and parasite systems. We also adumbrate the impact that proteomic analysis of host-pathogen interactions can have. Finally, we review relevant methods to the prediction of immunome, with special emphasis on quantitative methods, and the subcellular localization of proteins within bacteria.
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Affiliation(s)
- Irini A Doytchinova
- Edward Jenner Institute for Vaccine Research, High Street, Compton, Berkshire, RG20 7NN, UK
| | - Paul Taylor
- Edward Jenner Institute for Vaccine Research, High Street, Compton, Berkshire, RG20 7NN, UK
| | - Darren R Flower
- Edward Jenner Institute for Vaccine Research, High Street, Compton, Berkshire, RG20 7NN, UK
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61
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Linnemannstöns P, Schulte J, del Mar Prado M, Proctor RH, Avalos J, Tudzynski B. The polyketide synthase gene pks4 from Gibberella fujikuroi encodes a key enzyme in the biosynthesis of the red pigment bikaverin. Fungal Genet Biol 2002; 37:134-48. [PMID: 12409099 DOI: 10.1016/s1087-1845(02)00501-7] [Citation(s) in RCA: 122] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The ascomycete Gibberella fujikuroi mating population C (MP-C) is well known for the production of gibberellins, but also produces many other secondary metabolites, including the red polyketide pigment bikaverin. Here, we used a differential display method to clone a polyketide synthase gene pks4 responsible for the first step of bikaverin biosynthesis. Sequence analysis indicated that pks4 encoded a 2009-amino acid polypeptide consisting of four functional domains: beta-ketoacyl synthase (KS), acyltransferase (AT), acyl carrier (ACP), and thioesterase (TE). Disruption of pks4 resulted in the loss of both pks4 transcripts and bikaverin biosynthesis in G. fujikuroi cultures. Expression of pks4 is strongly repressed by high amounts of ammonium and basic pH. Unexpectedly, pks4 was overexpressed in mutants of the regulatory gene, areA, which is responsible for the activation of nitrogen assimilation genes. Three additional polyketide synthase genes have been cloned from G. fujikuroi MP-C by heterologous hybridization. The presence of these four PKS genes demonstrates the diversity of polyketide biosynthetic pathways in this fungus.
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Affiliation(s)
- Pia Linnemannstöns
- Institut für Botanik, Westfälische Wilhelms-Universität Münster, Schlossgarten 3, D-48149, Münster, Germany
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62
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Abstract
Opportunistic fungal pathogens are an important cause of fatal invasive diseases and one of the many threats facing immunocompromised patients. Because of the limitations of the antifungal therapies currently available such as their toxicity, their narrow spectrum and the emergence of resistant pathogens, there is a significant demand for a broader antifungal arsenal. The characterization of genes essential for fungal growth will be an important step in the identification and development of novel antifungal drugs. Original strategies and new technologies including in vivo or in vitro transposon mutagenesis and post-transcriptional gene silencing are being developed for genome-scale identification of essential genes in fungal species that are pathogenic to humans.
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Affiliation(s)
- Arnaud Firon
- Institut Pasteur, Unité Microbiologie et Environnement, CNRS URA 2172, 25, rue du Dr Roux, Paris, France
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63
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Trouvelot S, Olivain C, Recorbet G, Migheli Q, Alabouvette C. Recovery of Fusarium oxysporum Fo47 Mutants Affected in Their Biocontrol Activity After Transposition of the Fot1 Element. PHYTOPATHOLOGY 2002; 92:936-45. [PMID: 18944018 DOI: 10.1094/phyto.2002.92.9.936] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
ABSTRACT To investigate the biocontrol mechanisms by which the antagonistic Fusarium oxysporum strain Fo47 is active against Fusarium wilt, a Fot1 transposon-mediated insertional mutagenesis approach was adopted to generate mutants affected in their antagonistic activity. Ninety strains in which an active Fot1 copy had transposed were identified with a phenotypic assay for excision and tested for their biocontrol activity against F. oxysporum f. sp. lini on flax in greenhouse experiments. Sixteen strains were affected in their capacity to protect flax plants, either positively (more antagonistic than Fo47) or negatively (less antagonistic). The molecular characterization of these mutants confirms the excision of Fot1 and its reinsertion in most of the cases. Moreover, we demonstrate that other transposable elements such as Fot2, impala, and Hop have no transposition activity in the mutant genomes. The phenotypic characterization of these mutants shows that they are affected neither in their in vitro growth habit nor in their competitiveness in soil compared with wild-type strain Fo47. These results show that mutants are not impaired in their saprophytic phase and suggest that the altered biocontrol phenotype should likely be expressed during the interaction with the host plant.
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64
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Abstract
Within a few years, the genome sequences of a large number of medically and agriculturally important fungi will be known. With this resource come the promises of genomic approaches to study pathogenicity and host-fungus interactions. Genomics is particularly attractive for these questions, as conventional genetic and biochemical approaches are limited in many pathogenic fungi. Recent work has applied signature-tagged mutagenesis and DNA microarray analysis to virulence studies in several fungal species, and novel approaches, such as protein arrays and genomic deletion libraries, are being developed in Saccharomyces cerevisiae and have significant potential in other fungi. High-throughput gene-discovery approaches should greatly increase our understanding of fungal pathogenesis.
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Affiliation(s)
- Michael C Lorenz
- Whitehead Institute for Biomedical Research, Nine Cambridge Center, Cambridge, Massachusetts 02142, USA.
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65
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Punt PJ, van Biezen N, Conesa A, Albers A, Mangnus J, van den Hondel C. Filamentous fungi as cell factories for heterologous protein production. Trends Biotechnol 2002; 20:200-6. [PMID: 11943375 DOI: 10.1016/s0167-7799(02)01933-9] [Citation(s) in RCA: 314] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Filamentous fungi have been used as sources of metabolites and enzymes for centuries. For about two decades, molecular genetic tools have enabled us to use these organisms to express extra copies of both endogenous and exogenous genes. This review of current practice reveals that molecular tools have enabled several new developments. But it has been process development that has driven the final breakthrough to achieving commercially relevant quantities of protein. Recent research into gene expression in filamentous fungi has explored their wealth of genetic diversity with a view to exploiting them as expression hosts and as a source of new genes. Inevitably, the progress in the 'genomics' technology will further develop high-throughput technologies for these organisms.
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Affiliation(s)
- Peter J Punt
- TNO Nutrition and Food Research Institute, Dept of Applied Microbiology and Gene Technology, P.O. Box 360, 3700 AJ, Zeist, The Netherlands.
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66
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Soanes DM, Skinner W, Keon J, Hargreaves J, Talbot NJ. Genomics of phytopathogenic fungi and the development of bioinformatic resources. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2002; 15:421-427. [PMID: 12036272 DOI: 10.1094/mpmi.2002.15.5.421] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Genomic resources available to researchers studying phytopathogenic fungi are limited. Here, we briefly review the genomic and bioinformatic resources available and the current status of fungal genomics. We also describe a relational database containing sequences of expressed sequence tags (ESTs) from three phytopathogenic fungi, Blumeria graminis, Magnaporthe grisea, and Mycosphaerella graminicola, and the methods and underlying principles required for its construction. The database contains significant annotation for each EST sequence and is accessible at http://cogeme.ex.ac.uk. An easy-to-use interface allows the user to identify gene sequences by using simple text queries or homology searches. New querying functions and large sequence sets from a variety of phytopathogenic species will be incorporated in due course.
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Affiliation(s)
- Darren M Soanes
- School of Biological Sciences, University of Exeter, Washington Singer Laboratories, UK
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67
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Palmer CL, Skinner W. Mycosphaerella graminicola: latent infection, crop devastation and genomics. MOLECULAR PLANT PATHOLOGY 2002; 3:63-70. [PMID: 20569310 DOI: 10.1046/j.1464-6722.2002.00100.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
UNLABELLED summary Mycosphaerella graminicola is an important pathogen of wheat, causing septoria leaf blotch disease. This review summarizes the current knowledge on disease development and control of the fungus, and discusses how molecular tools and genomics are being employed to uncover the genetic basis of pathogenicity. TAXONOMY Mycosphaerella graminicola (Fuckel) J. Schröt. in Cohn (anamorph: Septoria tritici Roberge in Desmaz.). Kingdom Fungi, Phylum Ascomycota, Class Loculoascomycetes (filamentous ascomycetes), Order Dothideales, Genus Mycosphaerella, Species graminicola. HOST RANGE Bread and durum wheat (Triticum aestivum L. and T. turgidum ssp. durum L.) Disease symptoms: Initiating with the appearance of chlorotic flecks on leaves that develop into irregular sunken necrotic lesions peppered with tiny black spots (pycnidia). In addition to the necrotic tissue, the disease results in early leaf tissue senescence and therefore reduced photosynthetic capacity. USEFUL WEBSITES <http://cogeme.ex.ac.uk>, <http://www.plant.wageningen-ur.nl>, <http://www.paragen.com>.
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Affiliation(s)
- Claire-Louise Palmer
- School of Biological Sciences, University of Bristol, Woodland Road, Clifton, Bristol, BS8 1UG. UK
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68
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Affiliation(s)
- A E Osbourn
- Sainsbury Laboratory, John Innes Centre, Norwich NR4 7UH, United Kingdom.
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69
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Rauyaree P, Choi W, Fang E, Blackmon B, Dean RA. Genes expressed during early stages of rice infection with the rice blast fungus Magnaporthe grisea. MOLECULAR PLANT PATHOLOGY 2001; 2:347-54. [PMID: 20573024 DOI: 10.1046/j.1464-6722.2001.00085.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
summary A system-wide approach was adopted to further elucidate mechanisms regulating disease outcome between rice and the fungal pathogen Magnaporthe grisea. First, a cDNA library was constructed from M. grisea infected rice at 48 h post-inoculation. The 5' end-sequencing of 619 randomly selected clones revealed 359 expressed sequence tags (ESTs) that had not previously been described. A total of 124 from 260 ESTs with high and moderate similarity scores, based on BlastX, were organized into categories according to their putative function. The largest category of sequences (21%) contained stress or defence response genes. Eleven per cent of identified ESTs were redundant. In a second approach, differential hybridization analysis of the cDNA library using high-density filters resulted in the identification of novel genes and previously characterized M. grisea genes, including several that had previously been implicated in the infection process. A survey of up-regulated cDNA clones revealed clone 29003, which corresponded to the rice peroxidase POX22.3. This gene is known to be expressed in rice upon infection with Xanthomonas oryzae pv. oryzae, the bacterial blight pathogen. Importantly, this approach demonstrates the utility of gene discovery, through ESTs, for revealing novel genes in addition to those previously characterized as being potentially implicated in host-pathogen interactions.
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Affiliation(s)
- P Rauyaree
- Department of Plant Pathology and Physiology, Clemson University, Clemson, SC 29634, USA
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70
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Abstract
The exponentially growing collection of genomic sequence information, the high-throughput analysis of expression products, and the ability to order this information using advanced bioinformatics are expected to affect biotechnology and life sciences in a profound and unprecedented way. These developments offer many possibilities to improve the functionality of fermentations by food-grade microorganisms and to increase the microbial safety of foods. It will be necessary to combine functional studies with comparative genomics approaches to provide effective strategies for improving the functionality and safety of foods.
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Affiliation(s)
- W M de Vos
- Laboratory of Microbiology and Wageningen Centre for Food Sciences, Hesselink van Suchtelenweg 4, Wageningen, The Netherlands
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