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Habbadi K, Duplay Q, Chapulliot D, Kerzaon I, Benkirane R, Benbouazza A, Wisniewski-Dyé F, Lavire C, Achbani EH, Vial L. Characterization and phylogenetic diversity of Allorhizobium vitis isolated from grapevine in Morocco. J Appl Microbiol 2019; 128:828-839. [PMID: 31755153 DOI: 10.1111/jam.14523] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 07/18/2019] [Revised: 10/26/2019] [Accepted: 11/04/2019] [Indexed: 11/29/2022]
Abstract
AIMS Crown gall, a phytobacteriosis characterized by the formation of tumours on plant roots was observed in recently planted vineyards of the Meknes region (Morocco). The objective of this research was to analyse the diversity of pathogenic agrobacteria isolated from grapevine in Morocco. METHODS AND RESULTS Eighty-two isolates from 11 affected vineyards were characterized by recA sequencing and were found to belong to Agrobacterium tumefaciens genomospecies G1, G4 or G7, Rhizobium rhizogenes, and to Allorhizobium vitis. Only the All. vitis isolates appeared to be pathogenic on tomato and multilocus sequence analysis phylogenetic analyses revealed a weak genetic diversity, with the definition of only four genomic groups. Definition of the All. vitis genomic groups correlated with specific pathogenic traits: indeed, genomic groups differed with respect to the severity of hypersensitive response symptoms on tobacco leaves, the intensity of necrotic response on grapevine explants and opine profiles. Both vitopine and octopine were detected by UHPLC in tumours induced by isolates of three genomic groups, an opine signature scarcely ever reported. CONCLUSIONS Allorhizobium vitis is the only causative agent of crown gall on grape in Morocco, pathogenic isolates can be separated into four genomic groups. SIGNIFICANCE AND IMPACT OF THE STUDY This study of recently crown-gall-infested vineyards demonstrated that All. vitis is the only causative agent and revealed the presence of nonpathogenic Agrobacterium strain within tumours. Moreover, as the genetic diversity of the All. vitis isolates is relatively narrow, this study lays the basis for further analyses on the evolution of the disease, on the dissemination of the pTi and more globally on the fate of the different genomic groups in this newly colonized environment.
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Affiliation(s)
- K Habbadi
- Laboratoire de recherche et de protection des plantes URPP-INRA-Meknès, Meknes, Maroc.,Laboratoire de Botanique, Faculté des Sciences, Biotechnologie, et Protection des Plantes, Kenitra, Maroc.,CNRS-UMR 5557, Ecologie Microbienne, INRA-UMR1418, Université de Lyon, Université Lyon 1, Villeurbanne, France
| | - Q Duplay
- CNRS-UMR 5557, Ecologie Microbienne, INRA-UMR1418, Université de Lyon, Université Lyon 1, Villeurbanne, France
| | - D Chapulliot
- CNRS-UMR 5557, Ecologie Microbienne, INRA-UMR1418, Université de Lyon, Université Lyon 1, Villeurbanne, France
| | - I Kerzaon
- CNRS-UMR 5557, Ecologie Microbienne, INRA-UMR1418, Université de Lyon, Université Lyon 1, Villeurbanne, France
| | - R Benkirane
- Laboratoire de Botanique, Faculté des Sciences, Biotechnologie, et Protection des Plantes, Kenitra, Maroc
| | - A Benbouazza
- Laboratoire de recherche et de protection des plantes URPP-INRA-Meknès, Meknes, Maroc
| | - F Wisniewski-Dyé
- CNRS-UMR 5557, Ecologie Microbienne, INRA-UMR1418, Université de Lyon, Université Lyon 1, Villeurbanne, France
| | - C Lavire
- CNRS-UMR 5557, Ecologie Microbienne, INRA-UMR1418, Université de Lyon, Université Lyon 1, Villeurbanne, France
| | - E H Achbani
- Laboratoire de recherche et de protection des plantes URPP-INRA-Meknès, Meknes, Maroc
| | - L Vial
- CNRS-UMR 5557, Ecologie Microbienne, INRA-UMR1418, Université de Lyon, Université Lyon 1, Villeurbanne, France
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Vial L, Ducheyne E, Filatov S, Gerilovych A, McVey DS, Sindryakova I, Morgunov S, Pérez de León AA, Kolbasov D, De Clercq EM. Spatial multi-criteria decision analysis for modelling suitable habitats of Ornithodoros soft ticks in the Western Palearctic region. Vet Parasitol 2017; 249:2-16. [PMID: 29279082 DOI: 10.1016/j.vetpar.2017.10.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [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] [Received: 08/14/2017] [Revised: 10/09/2017] [Accepted: 10/30/2017] [Indexed: 11/19/2022]
Abstract
Ticks are economically and medically important ectoparasites due to the injuries inflicted through their bite, and their ability to transmit pathogens to humans, livestock, and wildlife. Whereas hard ticks have been intensively studied, little is known about soft ticks, even though they can also transmit pathogens, including African Swine Fever Virus (ASFV) affecting domestic and wild suids or Borrelia bacteria causing tick-borne relapsing fever (TBRF) in humans. We thus developed a regional model to identify suitable spatial areas for a community of nine Ornithodoros tick species (O. erraticus, O. sonrai, O. alactagalis, O. nereensis, O. tholozani, O. papillipes, O. tartakovskyi, O. asperus, O. verrucosus), which may be of medical and veterinary importance in the Western Palearctic region. Multi-Criteria Decision Analysis was used due to the relative scarcity of high-quality occurrence data. After an in-depth literature review on the ecological requirements of the selected tick community, five climate-related factors appeared critical for feeding activity and tick development: (i) a spring temperature exceeding 10°C to induce the end of winter soft tick quiescent period, (ii) a three-months summer temperature above 20°C to allow tick physiological activities, (iii) annual precipitation ranging from 60mm to 750mm and, in very arid areas, (iv) dry seasons interrupted by small rain showers to maintain minimum moisture inside their habitat along the year or (v) residual water provided by perennial rivers near habitats. We deliberately chose not to include biological factors such as host availability or vegetation patterns. A sensitivity analysis was done by performing multiple runs of the model altering the environmental variables, their suitability function, and their attributed weights. To validate the models, we used 355 occurrence data points, complemented by random points within sampled ecoregions. All models indicated suitable areas in the Mediterranean Basin and semi-desert areas in South-West and Central Asia. Most variability between models was observed along northern and southern edges of highly suitable areas. The predictions featured a relatively good accuracy with an average Area Under Curve (AUC) of 0.779. These first models provide a useful tool for estimating the global distribution of Ornithodoros ticks and targeting their surveillance in the Western Palearctic region.
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Affiliation(s)
- L Vial
- Centre of International Cooperation for Research in Agriculture Development (CIRAD), UMR ASTRE, F-34398 Montpellier, France; UMR ASTRE, Montpellier University, CIRAD, INRA, Montpellier, France.
| | | | - S Filatov
- National Scientific Center Institute of Experimental and Clinical Veterinary Medicine, Kharkiv, Ukraine.
| | - A Gerilovych
- National Scientific Center Institute of Experimental and Clinical Veterinary Medicine, Kharkiv, Ukraine.
| | - D S McVey
- Arthropod-borne Animal Diseases Research Unit, Center for Grain and Animal Health Research, United States; Department of Agriculture- Agricultural Research Service (USDA-ARS), Manhattan, Kansas, United States.
| | - I Sindryakova
- National Research Institute for Veterinary Virology and Microbiology (VNIIVViM), Pokrov, Russia.
| | - S Morgunov
- National Research Institute for Veterinary Virology and Microbiology (VNIIVViM), Pokrov, Russia.
| | - A A Pérez de León
- Knipling-Bushland U.S. Livestock Insects Research Laboratory and Veterinary Pest Genomics Center, United States; Department of Agriculture-Agricultural Research Service (USDA-ARS), Kerrville, Texas, United States.
| | - D Kolbasov
- National Research Institute for Veterinary Virology and Microbiology (VNIIVViM), Pokrov, Russia.
| | - E M De Clercq
- Georges Lemaitre Earth and Climate Research Centre, Earth and Life Institute, Université Catholique de Louvain (UCL), Louvain-La-Neuve, Belgium; Fonds de la Recherche Scientifique F.R.S. (FNRS), Brussels, Belgium.
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Estrada-Peña A, D’Amico G, Palomar A, Dupraz M, Fonville M, Heylen D, Habela M, Hornok S, Lempereur L, Madder M, Núncio M, Otranto D, Pfaffle M, Plantard O, Santos-Silva M, Sprong H, Vatansever Z, Vial L, Mihalca A. A comparative test of ixodid tick identification by a network of European researchers. Ticks Tick Borne Dis 2017; 8:540-546. [DOI: 10.1016/j.ttbdis.2017.03.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 03/04/2017] [Accepted: 03/06/2017] [Indexed: 10/20/2022]
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Dequivre M, Diel B, Villard C, Sismeiro O, Durot M, Coppée JY, Nesme X, Vial L, Hommais F. Small RNA Deep-Sequencing Analyses Reveal a New Regulator of Virulence in Agrobacterium fabrum C58. Mol Plant Microbe Interact 2015; 28:580-589. [PMID: 26024442 DOI: 10.1094/mpmi-12-14-0380-fi] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Novel ways of regulating Ti plasmid functions were investigated by studying small RNAs (sRNAs) that are known to act as posttranscriptional regulators in plant pathogenic bacteria. sRNA-seq analyses of Agrobacterium fabrum C58 allowed us to identify 1,108 small transcripts expressed in several growth conditions that could be sRNAs. A quarter of them were confirmed by bioinformatics or by biological experiments. Antisense RNAs represent 24% of the candidates and they are over-represented on the pTi (with 62% of pTi sRNAs), suggesting differences in the regulatory mechanisms between the essential and accessory replicons. Moreover, a large number of these pTi antisense RNAs are transcribed opposite to those genes involved in virulence. Others are 5'- and 3'-untranslated region RNAs and trans-encoded RNAs. We have validated, by rapid amplification of cDNA ends polymerase chain reaction, the transcription of 14 trans-encoded RNAs, among which RNA1111 is expressed from the pTiC58. Its deletion decreased the aggressiveness of A. fabrum C58 on tomatoes, tobaccos, and kalanchoe, suggesting that this sRNA activates virulence. The identification of its putative target mRNAs (6b gene, virC2, virD3, and traA) suggests that this sRNA may coordinate two of the major pTi functions, the infection of plants and its dissemination among bacteria.
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Affiliation(s)
- M Dequivre
- 1Université de Lyon, F-69622, Lyon, France
- 2Université Lyon 1, F-69622 Villeurbanne, France
- 3CNRS, UMR 5240 Microbiologie Adaptation et Pathogénie, F-69622 Villeurbanne, France
| | - B Diel
- 1Université de Lyon, F-69622, Lyon, France
- 2Université Lyon 1, F-69622 Villeurbanne, France
- 3CNRS, UMR 5240 Microbiologie Adaptation et Pathogénie, F-69622 Villeurbanne, France
- 4CNRS, UMR 5557 Ecologie Microbienne, F-69622 Villeurbanne, France
- 5INRA, USC 1364 Ecologie Microbienne, F-69622 Villeurbanne, France
| | - C Villard
- 1Université de Lyon, F-69622, Lyon, France
- 2Université Lyon 1, F-69622 Villeurbanne, France
- 3CNRS, UMR 5240 Microbiologie Adaptation et Pathogénie, F-69622 Villeurbanne, France
| | - O Sismeiro
- 6Plate-forme Transcriptome et Epigénome, Département Génomes et Génétique, Institut Pasteur, 25 rue du Dr. Roux, F75015 Paris, France
| | - M Durot
- 7CEA/DSV/FAR/IG/Genoscope and CNRS UMR8030 Laboratoire d'Analyses Bioinformatiques en Métabolisme et Génomique, 2 rue Gaston Crémieux 91057 Evry cedex, France
- 8Total New Energies USA, 5858 Horton Street, Emeryville, CA 94608, U.S.A
| | - J Y Coppée
- 6Plate-forme Transcriptome et Epigénome, Département Génomes et Génétique, Institut Pasteur, 25 rue du Dr. Roux, F75015 Paris, France
| | - X Nesme
- 1Université de Lyon, F-69622, Lyon, France
- 2Université Lyon 1, F-69622 Villeurbanne, France
- 4CNRS, UMR 5557 Ecologie Microbienne, F-69622 Villeurbanne, France
- 5INRA, USC 1364 Ecologie Microbienne, F-69622 Villeurbanne, France
| | - L Vial
- 1Université de Lyon, F-69622, Lyon, France
- 2Université Lyon 1, F-69622 Villeurbanne, France
- 4CNRS, UMR 5557 Ecologie Microbienne, F-69622 Villeurbanne, France
- 5INRA, USC 1364 Ecologie Microbienne, F-69622 Villeurbanne, France
| | - F Hommais
- 1Université de Lyon, F-69622, Lyon, France
- 2Université Lyon 1, F-69622 Villeurbanne, France
- 3CNRS, UMR 5240 Microbiologie Adaptation et Pathogénie, F-69622 Villeurbanne, France
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Raio L, Cappocia R, Hofstaetter C, Ahrens O, Vial L. Intrazerebrale Blutungen bei wachstumsretardierten Feten < 34 Wochen und mit Zentralisierung. Z Geburtshilfe Neonatol 2013. [DOI: 10.1055/s-0033-1361286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Shams M, Vial L, Chapulliot D, Nesme X, Lavire C. Rapid and accurate species and genomic species identification and exhaustive population diversity assessment of Agrobacterium spp. using recA-based PCR. Syst Appl Microbiol 2013; 36:351-8. [PMID: 23578959 DOI: 10.1016/j.syapm.2013.03.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 03/04/2013] [Accepted: 03/10/2013] [Indexed: 11/17/2022]
Abstract
Agrobacteria are common soil bacteria that interact with plants as commensals, plant growth promoting rhizobacteria or alternatively as pathogens. Indigenous agrobacterial populations are composites, generally with several species and/or genomic species and several strains per species. We thus developed a recA-based PCR approach to accurately identify and specifically detect agrobacteria at various taxonomic levels. Specific primers were designed for all species and/or genomic species of Agrobacterium presently known, including 11 genomic species of the Agrobacterium tumefaciens complex (G1-G9, G13 and G14, among which only G2, G4, G8 and G14 still received a Latin epithet: pusense, radiobacter, fabrum and nepotum, respectively), A. larrymoorei, A. rubi, R. skierniewicense, A. sp. 1650, and A. vitis, and for the close relative Allorhizobium undicola. Specific primers were also designed for superior taxa, Agrobacterium spp. and Rhizobiaceace. Primer specificities were assessed with target and non-target pure culture DNAs as well as with DNAs extracted from composite agrobacterial communities. In addition, we showed that the amplicon cloning-sequencing approach used with Agrobacterium-specific or Rhizobiaceae-specific primers is a way to assess the agrobacterial diversity of an indigenous agrobacterial population. Hence, the agrobacterium-specific primers designed in the present study enabled the first accurate and rapid identification of all species and/or genomic species of Agrobacterium, as well as their direct detection in environmental samples.
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Affiliation(s)
- M Shams
- Université de Lyon, F-69622 Lyon, France; Université Lyon 1, F-69622 Villeurbanne, France
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Jori F, Vial L, Penrith ML, Pérez-Sánchez R, Etter E, Albina E, Michaud V, Roger F. Review of the sylvatic cycle of African swine fever in sub-Saharan Africa and the Indian ocean. Virus Res 2012; 173:212-27. [PMID: 23142551 DOI: 10.1016/j.virusres.2012.10.005] [Citation(s) in RCA: 102] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Revised: 10/05/2012] [Accepted: 10/06/2012] [Indexed: 11/17/2022]
Abstract
African swine fever (ASF) is a major limiting factor for pig production in most of the countries in Sub-Saharan Africa and the Indian Ocean. In the absence of vaccine, a good understanding of the ecology and epidemiology of the disease is fundamental to implement effective control measures. In selected countries of Southern and East Africa, the association between Ornithodoros moubata ticks and warthogs has been described in detail in the literature. However, for many other countries in the region, information related to the sylvatic cycle is lacking or incomplete. In West African countries, for instance, the role of wild pigs in the epidemiology of ASF has never been demonstrated and the existence and potential impact of a sylvatic cycle involving an association between soft ticks and warthogs is questionable. In other countries, other wild pig species such as the bushpigs (Potamochoerus spp.) can also be asymptomatically infected by the virus but their role in the epidemiology of the disease is unclear and might differ according to geographic regions. In addition, the methods and techniques required to study the role of wild hosts in ASF virus (ASFV) epidemiology and ecology are very specific and differ from the more traditional methods to study domestic pigs or other tick species. The aim of this review is (i) to provide a descriptive list of the methodologies implemented to study the role of wild hosts in African swine fever, (ii) to compile the available knowledge about the sylvatic cycle of ASFV in different regions of Sub-Saharan Africa and the Indian Ocean in addition to the one that has been described for East and Southern Africa, and (iii) to discuss current methodologies and available knowledge in order to identify new orientations for further field and experimental surveys.
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Affiliation(s)
- F Jori
- Cirad, AGIRs Research Unit, Campus International de Baillarguet, 34398 Montpellier, France.
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8
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Ravaomanana J, Jori F, Vial L, Pérez-Sánchez R, Blanco E, Michaud V, Roger F. Assessment of interactions between African swine fever virus, bushpigs (Potamochoerus larvatus), Ornithodoros ticks and domestic pigs in north-western Madagascar. Transbound Emerg Dis 2011; 58:247-54. [DOI: 10.1111/j.1865-1682.2011.01207.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kone N, De Meeûs T, Bouyer J, Ravel S, Guerrini L, N'Goran EK, Vial L. Population structuring of the tsetse Glossina tachinoides resulting from landscape fragmentation in the Mouhoun River basin, Burkina Faso. Med Vet Entomol 2010; 24:162-168. [PMID: 20141594 DOI: 10.1111/j.1365-2915.2010.00857.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The impact of landscape fragmentation resulting from human- and climate-mediated factors on the structure of a population of Glossina tachinoides Westwood (Diptera: Glossinidae) in the Mouhoun River basin, Burkina Faso, was investigated. Allele frequencies at five microsatellite loci were compared in four populations. The average distance between samples was 72 km. The sampling points traversed an ecological cline in terms of rainfall and riverine forest ecotype, along a river loop that enlarged from upstream to downstream. Microsatellite DNA demonstrated no structuring among the groups studied (F(ST) = 0.015, P = 0.07), which is contrary to findings pertaining to Glossina palpalis gambiensis Vanderplank in the same geographical area. The populations of G. tachinoides showed complete panmixia (F(IS) = 0, P = 0.5 for the whole sample) and no genetic differentiation among populations or global positioning system trap locations. This is in line with the results of dispersal studies which indicated higher diffusion coefficients for G. tachinoides than for G. p. gambiensis. The impact of these findings is discussed within the framework of control campaigns currently promoted by the Pan African Tsetse and Trypanosomosis Eradication Campaign.
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Affiliation(s)
- N Kone
- Centre International de Recherche-Développement sur l'Elevage en Zone Subhumide, Bobo Dioulasso, Burkina Faso.
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Vial L. Biological and ecological characteristics of soft ticks (Ixodida: Argasidae) and their impact for predicting tick and associated disease distribution. Parasite 2010; 16:191-202. [PMID: 19839264 DOI: 10.1051/parasite/2009163191] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
As evidence of global changes is accumulating, scientists are challenged to detect distribution changes of vectors, reservoirs and pathogens caused by anthropogenic and/or environmental changes. Statistical and mathematical distribution models are emerging for ixodid hard ticks whereas no prediction has ever been developed for argasid ones. These last organisms remain unknown and under-reported; they differ from hard ticks by many structural, biological and ecological properties, which complicate direct adaptation of hard tick models. However, investigations on bibliographic resources concerning these ticks suggest that distribution modelling based on natural niche concept and using environmental factors especially climate is also possible, bearing in mind the scale of prediction and their specificities including their nidicolous lifestyle, an indiscriminate host feeding and a short bloodmeal duration, as well as a flexible development cycle through diapause periods.
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Affiliation(s)
- L Vial
- Centre de Cooperation Internationale en Recherche Agronomique pour le Développement (CIRAD), BIOS UMR15 (TA A-15/G), Campus International de Baillarguet, 34398 Montpellier cedex 5, France.
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Bouyer J, Balenghien T, Ravel S, Vial L, Sidibé I, Thévenon S, Solano P, De Meeûs T. Population sizes and dispersal pattern of tsetse flies: rolling on the river? Mol Ecol 2009; 18:2787-97. [PMID: 19457176 DOI: 10.1111/j.1365-294x.2009.04233.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The West African trypanosomoses are mostly transmitted by riverine species of tsetse fly. In this study, we estimate the dispersal and population size of tsetse populations located along the Mouhoun river in Burkina Faso where tsetse habitats are experiencing increasing fragmentation caused by human encroachment. Dispersal estimated through direct (mark and recapture) and indirect (genetic isolation by distance) methods appeared consistent with one another. In these fragmented landscapes, tsetse flies displayed localized, small subpopulations with relatively short effective dispersal. We discuss how such information is crucial for designing optimal strategies for eliminating this threat. To estimate ecological parameters of wild animal populations, the genetic measures are both a cost- and time-effective alternative to mark-release-recapture. They can be applied to other vector-borne diseases of medical and/or economic importance.
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Affiliation(s)
- J Bouyer
- Cirad, UMR CIRAD-INRA Contrôle des maladies animales, Campus International de Baillarguet, F34398, Montpellier, France.
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Patin S, Sahler C, Balosso J, Chapet O, Baron MH, Ginestet C, Vial L, Biston MC, Pommier P. Le projet OMéRRIC, « Organisation médicale du recrutement pour la radiothérapie par ions carbone ». Cancer Radiother 2008. [DOI: 10.1016/j.canrad.2008.08.069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Khodri M, Vial L, Baury M, Plattard D, Martin H, Tete I, Remini N, Delaroche G, Schmitt T. Expérience clinique de la dosimétrie portale (PDIP) en vue de la vérification avant une RCMI. Cancer Radiother 2008. [DOI: 10.1016/j.canrad.2008.08.255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Chapet O, Sotton MP, Bouffard J, Vial L, Belliere A, Ardiet JM, Mornex F, Sentenac I, Romestaing P. Intérêts potentiels decombiner uneradiothérapie deconformation avecmodulation d'intensité (RCMI) avecunrepositionnement journalier surimplants intraprostatiques pourréduire latoxicité sexuelle induite parl'irradiation exclusive descancers deprostate. Cancer Radiother 2007. [DOI: 10.1016/j.canrad.2007.09.091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Durand E, de Rochefort L, Maître X, Fodil R, Louis B, Vial L, Darrasse L, Caillibotte G, Sbirlea-Apiou G, Bittoun J, Isabey D. Three-component gas velocity mapping by magnetic resonance imaging. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)85496-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Garcia R, Bodez V, Vial L, Gaillot-Petit N, Chastel D, Licata R, Pourel N, Reboul F. Techniques innovantes en radiothérapie des cancers bronchiques. ONCOLOGIE 2005. [DOI: 10.1007/s10269-005-0263-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Garcia R, Alfonsi M, Bodez V, Vial L. 510 Head and Neck IMRT always need better precision. Radiother Oncol 2005. [DOI: 10.1016/s0167-8140(05)81486-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Fetita C, Mancini S, Perchet D, Prêteux F, Thiriet M, Vial L. An image-based computational model of oscillatory flow in the proximal part of tracheobronchial trees. Comput Methods Biomech Biomed Engin 2005; 8:279-93. [PMID: 16298850 DOI: 10.1080/10255840500289624] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A computational model of an oscillatory laminar flow of an incompressible Newtonian fluid has been carried out in the proximal part of human tracheobronchial trees, either normal or with a strongly stenosed right main bronchus. After acquisition with a multislice spiral CT, the thoracic images are processed to reconstruct the geometry of the trachea and the first six bronchus generations and to virtually travel inside this duct network. The facetisation associated with the 3D reconstruction of the tracheobronchial tree is improved to get a computation-adapted surface triangulation, which leads to a volumic mesh composed of tetrahedra. The Navier-Stokes equations associated with the classical boundary conditions and different values of the flow dimensionless parameters are solved using the finite element method. The airways are supposed to be rigid during rest breathing. The flow distribution among the set of bronchi is determined during the respiratory cycle. Cycle reproducibility and mesh size effects on the numerical results are examined. Helpful qualitative data are provided rather than accurate quantitative results in the context of multimodelling, from image processing to numerical simulations.
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Affiliation(s)
- C Fetita
- Unité de Projets ARTEMIS, Institut National des Télécommunications, F-91011 Evry, France
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Fodil R, Croce C, Louis B, Coste A, Blondeau J, Isabey D, Perchet D, Fetita C, Preteux F, Grenier P, Vial L, Caillibotte G, Till M, Maday Y, Thiriet M, de Rochefort L, Maître X, Bittoun J, Durand E, Sbirlea-Apiou G. Simulateur morphofonctionnel des voies aériennes supérieures et proximales. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.rbmret.2004.11.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Garcia R, Bodez V, Vial L, Le Thanh H, Reboul F. [Recommendations in the use of portal images]. Cancer Radiother 2004; 8 Suppl 1:S56-60. [PMID: 15679248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
Technical radiotherapy progress drive the practices towards increasingly more precise irradiations. The recent developments of the various imaging methods and specialized software made more controls possible. The fields of investigations relate to the quality assurance of the irradiation, the reproducibility of positioning, the movements evaluations and real time dosimetry. Radiotherapy finds, in the images exploitation, a strong potential in improving quality treatments, however it is conditioned by the implementation of ambitious programs, time consuming, but essential to grant the precision of virtual simulations and the daily practice. If all the existing technical devices and software offer higher tools than the current practices, the recommendations can be limited to the insurance of a sufficient precision and reproducibility of the whole treatments. It is thus fundamental to be able to filter the errors, the systematic deviations and to control the statistics of positioning and movements. Each radiotherapy department must apply an adapted program to each site and exploit the imaging chain to maintain its results.
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Affiliation(s)
- R Garcia
- Service de radiothérapie, institut Sainte-Catherine, 1750, chemin Louvarin, Avignon, France.
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Chevalier V, de la Rocque S, Baldet T, Vial L, Roger F. Epidemiological processes involved in the emergence of vector-borne diseases : West Nile fever, Rift Valley fever, Japanese encephalitis and Crimean-Congo haemorrhagic fever. REV SCI TECH OIE 2004; 23:535-55. [PMID: 15702718 DOI: 10.20506/rst.23.2.1505] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Over the past few decades, the geographical distribution of arthropod-borne zoonoses has dramatically expanded. The influence of human-induced or ecological changes on the risk of disease outbreaks is undeniable. However, few hypotheses have been proposed which address the re-emergence of these diseases, the spread of these viruses to previously uninfected areas and their establishment therein. Host and vector movements play an important role in the dissemination of pathogens, and the ability of these diseases to colonise previously uninfected areas may be explained by the diversity of hosts and vectors, the presence of favourable ecological conditions, and the successful adaptations of vectors or pathogens to new ecosystems. The objective of this paper is to describe the epidemiological processes of the vector-borne diseases Rift Valley fever, West Nile fever, Japanese encephalitis and Crimean-Congo haemorrhagic fever.
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Affiliation(s)
- V Chevalier
- Centre de coopération internationale en recherche agronomique pour le développement, Campus International de Baillarguet, 34398 Montpellier Cedex 5, France
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Takeuchi N, Vial L, Panvert M, Schmitt E, Watanabe K, Mechulam Y, Blanquet S. Recognition of tRNAs by Methionyl-tRNA transformylase from mammalian mitochondria. J Biol Chem 2001; 276:20064-8. [PMID: 11274157 DOI: 10.1074/jbc.m101007200] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Protein synthesis involves two methionine-isoaccepting tRNAs, an initiator and an elongator. In eubacteria, mitochondria, and chloroplasts, the addition of a formyl group gives its full functional identity to initiator Met-tRNA(Met). In Escherichia coli, it has been shown that the specific action of methionyl-tRNA transformylase on Met-tRNA(f)(Met) mainly involves a set of nucleotides in the acceptor stem, particularly a C(1)A(72) mismatch. In animal mitochondria, only one tRNA(Met) species has yet been described. It is admitted that this species can engage itself either in initiation or elongation of translation, depending on the presence or absence of a formyl group. In the present study, we searched for the identity elements of tRNA(Met) that govern its formylation by bovine mitochondrial transformylase. The main conclusion is that the mitochondrial formylase preferentially recognizes the methionyl moiety of its tRNA substrate. Moreover, the relatively small importance of the tRNA acceptor stem in the recognition process accounts for the protection against formylation of the mitochondrial tRNAs that share with tRNA(Met) an A(1)U(72) motif.
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Affiliation(s)
- N Takeuchi
- Laboratoire de Biochimie, Unité Mixte de Recherche Number 7654, CNRS, Ecole Polytechnique, F-91128 Palaiseau cedex, France
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Levitzky MG, Vial L, Smith DE. Use of combined examinations in the basic sciences. Acad Med 1996; 71:1278-1279. [PMID: 9114880 DOI: 10.1097/00001888-199612000-00004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Lecomte F, Cailleux N, Girault C, Vial L, Guyonnaud C, Lévesque H, Leroy J, Courtois H. Facteurs de risque des pneumocystoses en dehors de la pathologie VIH: la corticothérapie est elle responsable ? Rev Med Interne 1996. [DOI: 10.1016/s0248-8663(97)81035-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Varela MA, Vial L, Zunzunegui J. [Pathology of the diaphragm in children]. Rev Chil Pediatr 1976; 47:115-20. [PMID: 1029026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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