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Ribeiro BM, Ughini MO, Gomes PMS, Júnior JWL. RELATO DE CASO: TOXICIDADE CEREBELAR INDUZIDA POR CITARABINA DURANTE TRATAMENTO DE LEUCEMIA MIELÓIDE AGUDA (LMA). Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Gomes PMS, Ughini MO, Ribeiro BM, Júnior JWL. SARCOMA MIELOIDE NA LEUCEMIA MIELOIDE AGUDA EM REMISSÃO: RELATO DE CASO. Hematol Transfus Cell Ther 2021. [PMCID: PMC8530622 DOI: 10.1016/j.htct.2021.10.303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
Introdução Relato de caso Discussão e conclusão
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Sosa-Gómez DR, Morgado FS, Corrêa RFT, Silva LA, Ardisson-Araújo DMP, Rodrigues BMP, Oliveira EE, Aguiar RWS, Ribeiro BM. Entomopathogenic Viruses in the Neotropics: Current Status and Recently Discovered Species. Neotrop Entomol 2020; 49:315-331. [PMID: 32358711 DOI: 10.1007/s13744-020-00770-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 03/03/2020] [Indexed: 06/11/2023]
Abstract
The market for biological control of insect pests in the world and in Brazil has grown in recent years due to the unwanted ecological and human health impacts of chemical insecticides. Therefore, research on biological control agents for pest management has also increased. For instance, insect viruses have been used to protect crops and forests around the world for decades. Among insect viruses, the baculoviruses are the most studied and used viral biocontrol agent. More than 700 species of insects have been found to be naturally infected by baculoviruses, with 90% isolated from lepidopteran insects. In this review, some basic aspects of baculovirus infection in vivo and in vitro infection, gene content, viral replication will be discussed. Furthermore, we provide examples of the use of insect viruses for biological pest control and recently characterized baculoviruses in Brazil.
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Affiliation(s)
- D R Sosa-Gómez
- Empresa Brasileira de Pesquisa Agropecuária, Embrapa Soja, Londrina, PR, Brasil
| | - F S Morgado
- Depto de Biologia Celular, Univ of Brasília, Brasília, DF, Brasil
| | - R F T Corrêa
- Depto de Biotecnologia, Univ Federal de Tocantins, Gurupi, TO, Brasil
| | - L A Silva
- Depto de Biologia Celular, Univ of Brasília, Brasília, DF, Brasil
| | - D M P Ardisson-Araújo
- Depto de Bioquímica e Biologia Molecular, Univ Federal de Santa Maria, Santa Maria, RS, Brasil
| | - B M P Rodrigues
- Depto de Biologia Celular, Univ of Brasília, Brasília, DF, Brasil
| | - E E Oliveira
- Depto de Entomologia, Univ Federal de Viçosa, Viçosa, MG, Brasil
| | - R W S Aguiar
- Depto de Biotecnologia, Univ Federal de Tocantins, Gurupi, TO, Brasil
| | - B M Ribeiro
- Depto de Biologia Celular, Univ of Brasília, Brasília, DF, Brasil.
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Dib MA, Oliveira NJ, Marques AE, Oliveira MC, Fernandes JV, Ribeiro BM, Prates PA. Single and ensemble classifiers for defect prediction in sheet metal forming under variability. Neural Comput Appl 2019. [DOI: 10.1007/s00521-019-04651-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
AbstractThis paper presents an approach, based on machine learning techniques, to predict the occurrence of defects in sheet metal forming processes, exposed to sources of scatter in the material properties and process parameters. An empirical analysis of performance of ML techniques is presented, considering both single learning and ensemble models. These are trained using data sets populated with numerical simulation results of two sheet metal forming processes: U-Channel and Square Cup. Data sets were built for three distinct steel sheets. A total of eleven input features, related to the mechanical properties, sheet thickness and process parameters, were considered; also, two types of defects (outputs) were analysed for each process. The sampling data were generated, assuming that the variability of each input feature is described by a normal distribution. For a given type of defect, most single classifiers show similar performances, regardless of the material. When comparing single learning and ensemble models, the latter can provide an efficient alternative. The fact that ensemble predictive models present relatively high performances, combined with the possibility of reconciling model bias and variance, offer a promising direction for its application in industrial environment.
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Ferreira BC, Melo FL, Silva AMR, Sanches MM, Moscardi F, Ribeiro BM, Souza ML. Biological and molecular characterization of two Anticarsia gemmatalis multiple nucleopolyhedrovirus clones exhibiting contrasting virulence. J Invertebr Pathol 2019; 164:23-31. [PMID: 30930188 DOI: 10.1016/j.jip.2019.03.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 05/24/2018] [Revised: 03/14/2019] [Accepted: 03/26/2019] [Indexed: 12/11/2022]
Abstract
Baculovirus natural populations are known to be genetically heterogeneous and such genotypic diversity could have implications in the performance of biocontrol agents. The Anticarsia gemmatalis nucleopolyhedrovirus (AgMNPV) has been widely used to control the velvetbean caterpillar, Anticarsia gemmatalis, in Brazil. In the present work, morphological and molecular analyses as well as the biological activity of AgMNPV genotypes derived from a Brazilian field isolate (AgMNPV-79) were carried out. The existence of genotypic variants in the population was confirmed by DNA restriction analysis. Although difference in virulence was observed among the variants, the most (Ag79-01) and the least (AgL-16) virulent clones do not show any morphological and cytopathological changes when compared to the most studied isolate (AgMNPV-2D). The complete genome analysis of the two viral clones showed the presence of single open reading frames (ORFs) of the pe-38 and he65 genes, which contrasts with the two split ORFs present in the genome of the AgMNPV-2D isolate. The viral clone AgL-16 has many variations in the ie-2 and pe-38 genes, which are transcription regulatory genes responsible for the regulation of viral early gene expression during insect cell infection. Furthermore, other genes showed alterations like the odv-e56, which have an essential role in the maturation and envelopment of the ODVs, and bro-a and bro-b genes which were fused to form a single ORF. For the Ag79-01, although the total number of single nucleotide variants (SNVs) was more prominent in the pe-38 gene, its genome showed very few modifications in comparison to the AgMNPV-2D genome.
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Affiliation(s)
- B C Ferreira
- Embrapa Recursos Genéticos e Biotecnologia (Cenargen), Parque Estação Biológica, W5 Norte Final, 70770-917 Brasília, DF, Brazil; Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Asa Norte, 70910-900 Brasília, DF, Brazil
| | - F L Melo
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Asa Norte, 70910-900 Brasília, DF, Brazil
| | - A M R Silva
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Asa Norte, 70910-900 Brasília, DF, Brazil
| | - M M Sanches
- Embrapa Recursos Genéticos e Biotecnologia (Cenargen), Parque Estação Biológica, W5 Norte Final, 70770-917 Brasília, DF, Brazil
| | - F Moscardi
- Embrapa Soja, CEP 86001-970 Londrina, PR, Brazil
| | - B M Ribeiro
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Asa Norte, 70910-900 Brasília, DF, Brazil
| | - M L Souza
- Embrapa Recursos Genéticos e Biotecnologia (Cenargen), Parque Estação Biológica, W5 Norte Final, 70770-917 Brasília, DF, Brazil.
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Brito AF, Melo FL, Ardisson-Araújo DMP, Sihler W, Souza ML, Ribeiro BM. Genome-wide diversity in temporal and regional populations of the betabaculovirus Erinnyis ello granulovirus (ErelGV). BMC Genomics 2018; 19:698. [PMID: 30249206 PMCID: PMC6154946 DOI: 10.1186/s12864-018-5070-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 12/30/2017] [Accepted: 09/11/2018] [Indexed: 11/30/2022] Open
Abstract
Background Erinnyis ello granulovirus (ErelGV) is a betabaculovirus infecting caterpillars of the sphingid moth E. ello ello (cassava hornworm), an important pest of cassava crops (Manihot esculenta). In this study, the genome of seven field isolates of the virus ErelGV were deep sequenced and their inter- and intrapopulational sequence diversity were analyzed. Results No events of gene gain/loss or translocations were observed, and indels were mainly found within highly repetitive regions (direct repeats, drs). A naturally occurring isolate from Northern Brazil (Acre State, an Amazonian region) has shown to be the most diverse population, with a unique pattern of polymorphisms. Overall, non-synonymous substitutions were found all over the seven genomes, with no specific gathering of mutations on hotspot regions. Independently of their sizes, some ORFs have shown higher levels of non-synonymous changes than others. Non-core genes of known functions and structural genes were among the most diverse ones; and as expected, core genes were the least variable genes. We observed remarkable differences on diversity of paralogous genes, as in multiple copies of p10, fgf, and pep. Another important contrast on sequence diversity was found on genes encoding complex subunits and/or involved in the same biological processes, as late expression factors (lefs) and per os infectivity factors (pifs). Interestingly, several polymorphisms in coding regions lie on sequences encoding specific protein domains. Conclusions By comparing and integrating information about inter- and intrapopulational diversity of viral isolates, we provide a detailed description on how evolution operates on field isolates of a betabaculovirus. Our results revealed that 35–41% of the SNPs of ErelGV lead to amino acid changes (non-synonymous substitutions). Some genes, especially non-core genes of unknown functions, tend to accumulate more mutations, while core genes evolve slowly and are more conserved. Additional studies would be necessary to understand the actual effects of such gene variations on viral infection and fitness. Electronic supplementary material The online version of this article (10.1186/s12864-018-5070-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- A F Brito
- Centre for Integrative Systems Biology and Bioinformatics, Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - F L Melo
- Laboratory of Baculovirus, Cell Biology Department, University of Brasilia, Brasília, DF, 70910-970, Brazil
| | - D M P Ardisson-Araújo
- Laboratory of Insect Virology, Department of Biochemistry and Molecular Biology, Federal University of Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - W Sihler
- Embrapa Genetic Resources and Biotechnology, Biological Station Park, Brasília, DF, 70770-917, Brazil
| | - M L Souza
- Embrapa Genetic Resources and Biotechnology, Biological Station Park, Brasília, DF, 70770-917, Brazil
| | - B M Ribeiro
- Laboratory of Baculovirus, Cell Biology Department, University of Brasilia, Brasília, DF, 70910-970, Brazil.
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Souza DM, Alves PM, Silva MLF, Paulino TP, Coraspe HO, Mendonça MMS, Ribeiro BM, da Silva MV, Rodrigues Júnior V, Rodrigues DBR. 5-ALA-mediated photodynamic therapy reduces the parasite load in mice infected withLeishmania braziliensis. Parasite Immunol 2017; 39. [DOI: 10.1111/pim.12403] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 11/17/2016] [Indexed: 11/30/2022]
Affiliation(s)
- D. M. Souza
- Immunology Laboratory; Department of Biological Sciences; Federal University of Triângulo Mineiro; Uberaba Minas Gerais Brazil
| | - P. M. Alves
- Immunology Laboratory; Department of Biological Sciences; Federal University of Triângulo Mineiro; Uberaba Minas Gerais Brazil
| | - M. L. F. Silva
- Immunology Laboratory; Department of Biological Sciences; Federal University of Triângulo Mineiro; Uberaba Minas Gerais Brazil
| | - T. P. Paulino
- Cefores - Centro de Educação Profissional; Federal University of Triângulo Mineiro; Uberaba Minas Gerais Brazil
| | - H. O. Coraspe
- Immunology Laboratory; Department of Biological Sciences; Federal University of Triângulo Mineiro; Uberaba Minas Gerais Brazil
| | - M. M. S. Mendonça
- Immunology Laboratory; Department of Biological Sciences; Federal University of Triângulo Mineiro; Uberaba Minas Gerais Brazil
| | - B. M. Ribeiro
- Immunology Laboratory; Department of Biological Sciences; Federal University of Triângulo Mineiro; Uberaba Minas Gerais Brazil
| | - M. V. da Silva
- Immunology Laboratory; Department of Biological Sciences; Federal University of Triângulo Mineiro; Uberaba Minas Gerais Brazil
| | - V. Rodrigues Júnior
- Immunology Laboratory; Department of Biological Sciences; Federal University of Triângulo Mineiro; Uberaba Minas Gerais Brazil
| | - D. B. R. Rodrigues
- Immunology Laboratory; Department of Biological Sciences; Federal University of Triângulo Mineiro; Uberaba Minas Gerais Brazil
- Cefores - Centro de Educação Profissional; Federal University of Triângulo Mineiro; Uberaba Minas Gerais Brazil
- Department of Immunology and Molecular Biology; University of Uberaba; Uberaba Minas Gerais Brazil
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Aragão-Silva CW, Andrade MS, Ardisson-Araújo DMP, Fernandes JEA, Morgado FS, Báo SN, Moraes RHP, Wolff JLC, Melo FL, Ribeiro BM. The complete genome of a baculovirus isolated from an insect of medical interest: Lonomia obliqua (Lepidoptera: Saturniidae). Sci Rep 2016; 6:23127. [PMID: 27282807 PMCID: PMC4901303 DOI: 10.1038/srep23127] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 02/25/2016] [Indexed: 01/08/2023] Open
Abstract
Lonomia obliqua (Lepidoptera: Saturniidae) is a species of medical importance due to the severity of reactions caused by accidental contact with the caterpillar bristles. Several natural pathogens have been identified in L. obliqua, and among them the baculovirus Lonomia obliqua multiple nucleopolyhedrovirus (LoobMNPV). The complete genome of LoobMNPV was sequenced and shown to have 120,022 bp long with 134 putative open reading frames (ORFs). Phylogenetic analysis of the LoobMNPV genome showed that it belongs to Alphabaculovirus group I (lepidopteran-infective NPV). A total of 12 unique ORFs were identified with no homologs in other sequenced baculovirus genomes. One of these, the predicted protein encoded by loob035, showed significant identity to an eukaryotic transcription terminator factor (TTF2) from the Lepidoptera Danaus plexippus, suggesting an independent acquisition through horizontal gene transfer. Homologs of cathepsin and chitinase genes, which are involved in host integument liquefaction and viral spread, were not found in this genome. As L. obliqua presents a gregarious behavior during the larvae stage the impact of this deletion might be neglectable.
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Affiliation(s)
- C W Aragão-Silva
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF, Brazil
| | - M S Andrade
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF, Brazil
| | - D M P Ardisson-Araújo
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF, Brazil
| | - J E A Fernandes
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF, Brazil
| | - F S Morgado
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF, Brazil
| | - S N Báo
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF, Brazil
| | - R H P Moraes
- Departamento de Entomologia, Instituto Butantan, Av. Vital Brasil, 1500, São Paulo, Brazil
| | - J L C Wolff
- Laboratório de Biologia Molecular e Virologia, Centro de Ciências Biológicas e da Saúde (CCBS), Universidade Presbiteriana Mackenzie, São Paulo, SP, Brazil
| | - F L Melo
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF, Brazil
| | - B M Ribeiro
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF, Brazil
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Carpes MP, Nunes JF, Sampaio TL, Castro MEB, Zanotto PMA, Ribeiro BM. Molecular analysis of a mutant Anticarsia gemmatalis multiple nucleopolyhedrovirus (AgMNPV) shows an interruption of an inhibitor of apoptosis gene (iap-3) by a new class-II piggyBac-related insect transposon. Insect Mol Biol 2009; 18:747-757. [PMID: 19788700 DOI: 10.1111/j.1365-2583.2009.00917.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A new piggyBac-related transposable element (TE) was found in the genome of a mutant Anticarsia gemmatalis multiple nucleopolyhedrovirus interrupting an inhibitor of apoptosis gene. This mutant virus induces apoptosis upon infection of an Anticarsia gemmatalis cell line, but not in a Trichoplusia ni cell line. The sequence of the new TE (which was named IDT for iap disruptor transposon) has 2531 bp with two DNA sequences flanking a putative Transposase (Tpase) ORF of 1719 bp coding for a protein with 572 amino acids. These structural features are similar to the piggyBac TE, also reported for the first time in the genome of a baculovirus. We have also isolated variants of this new TE from different lepidopteran insect cells and compared their Tpase sequences.
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Affiliation(s)
- M P Carpes
- Laboratório de Microscopia Eletrônica, Departamento de Biologia Celular, Universidade de Brasília, Brasília, DF, Brazil
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Silveira EB, Cordeiro BA, Ribeiro BM, Báo SN. Morphological characterization of Anticarsia gemmatalis M nucleopolyhedrovirus infection in haemocytes from its natural larval host, the velvet bean caterpillar Anticarsia gemmatalis (Hübner) (Lepidoptera: Noctuidae). Tissue Cell 2004; 36:171-80. [PMID: 15140594 DOI: 10.1016/j.tice.2004.01.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2003] [Revised: 01/08/2004] [Accepted: 01/09/2004] [Indexed: 11/16/2022]
Abstract
For a better understanding of virus x host interactions, transmission electron microscopy was used to characterize the intrahaemocoelic infection of Anticarsia gemmatalis larval haemocytes by A. gemmatalis M nucleopolyhedrovirus (AgMNPV). At 12 h post-infection (h p.i.), we observed nuclear hypertrophy, budded virus assembling, and protrusion towards the cytoplasm, virion envelopment, and accumulation of fibrillar aggregates in the cytoplasm. Around 24 h p.i., fibrillar aggregates also appeared inside nuclei of infected cells. By 48 h p.i., virogenic stroma and polyhedra were visualised in nuclei and at 72 h p.i., widespread infection in haemocytes was observed. Cell remnants and free polyhedra were phagocytosed by granular haemocyte 1 and plasmatocytes. Entire cells were phagocytosed only by plasmatocytes. Necrosis of infected cells was quite common, suggesting a putative cytotoxic response. Granular haemocyte 1 presented a more exuberant protrusion of budded viruses in comparison to other haemocytes. All types of haemocytes were shown to be infected, and the intense virus replication in some of these cells reveals the importance of haemolymph for AgMNPV spread in its natural host, a critical factor for permissiveness.
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Affiliation(s)
- E B Silveira
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade Estudual de Campinas, Campinas, SP, Brazil
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Felipe MSS, Andrade RV, Petrofeza SS, Maranhão AQ, Torres FAG, Albuquerque P, Arraes FBM, Arruda M, Azevedo MO, Baptista AJ, Bataus LAM, Borges CL, Campos EG, Cruz MR, Daher BS, Dantas A, Ferreira MASV, Ghil GV, Jesuino RSA, Kyaw CM, Leitão L, Martins CR, Moraes LMP, Neves EO, Nicola AM, Alves ES, Parente JA, Pereira M, Poças-Fonseca MJ, Resende R, Ribeiro BM, Saldanha RR, Santos SC, Silva-Pereira I, Silva MAS, Silveira E, Simões IC, Soares RBA, Souza DP, De-Souza MT, Andrade EV, Xavier MAS, Veiga HP, Venancio EJ, Carvalho MJA, Oliveira AG, Inoue MK, Almeida NF, Walter MEMT, Soares CMA, Brígido MM. Transcriptome characterization of the dimorphic and pathogenic fungus Paracoccidioides brasiliensis by EST analysis. Yeast 2003; 20:263-71. [PMID: 12557278 DOI: 10.1002/yea.964] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [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: 11/07/2022] Open
Abstract
Paracoccidioides brasiliensis is a pathogenic fungus that undergoes a temperature-dependent cell morphology change from mycelium (22 degrees C) to yeast (36 degrees C). It is assumed that this morphological transition correlates with the infection of the human host. Our goal was to identify genes expressed in the mycelium (M) and yeast (Y) forms by EST sequencing in order to generate a partial map of the fungus transcriptome. Individual EST sequences were clustered by the CAP3 program and annotated using Blastx similarity analysis and InterPro Scan. Three different databases, GenBank nr, COG (clusters of orthologous groups) and GO (gene ontology) were used for annotation. A total of 3,938 (Y = 1,654 and M = 2,274) ESTs were sequenced and clustered into 597 contigs and 1,563 singlets, making up a total of 2,160 genes, which possibly represent one-quarter of the complete gene repertoire in P. brasiliensis. From this total, 1,040 were successfully annotated and 894 could be classified in 18 functional COG categories as follows: cellular metabolism (44%); information storage and processing (25%); cellular processes-cell division, posttranslational modifications, among others (19%); and genes of unknown functions (12%). Computer analysis enabled us to identify some genes potentially involved in the dimorphic transition and drug resistance. Furthermore, computer subtraction analysis revealed several genes possibly expressed in stage-specific forms of P. brasiliensis. Further analysis of these genes may provide new insights into the pathology and differentiation of P. brasiliensis.
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Affiliation(s)
- M S S Felipe
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade de Brasília, 70910-900 Brasília, DF, Brasil.
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de Castro ME, Ribeiro BM. Production of viral progeny in insect cells undergoing apoptosis induced by a mutant Anticarsia gemmatalis nucleopolyhedrovirus. Microbiol Res 2002; 156:369-76. [PMID: 11770855 DOI: 10.1078/0944-5013-00122] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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: 11/18/2022]
Abstract
The Anticarsia gemmatalis nucleopolyhedrovirus (AgMNPV) is the most successful viral biopesticide in use worldwide. We have demonstrated that despite widespread apoptosis and no protein synthesis at 48 h p.i., UFL-AG-286 cells infected with a mutant of AgMNPV (vApAg), produced significant amounts of budded virus (BVs) and viral DNA late in infection. However, a different susceptible cell line (BTI-Tn5B 1-4) showed no signs of apoptosis and produced 3.5 times more budded virus when infected with vApAg. A comparison of DNA from AgMNPV and vApAg digested with the same restriction enzymes showed differences in the restriction pattern, indicating that the vApAg phenotype might be due to a mutation in a gene or genes responsible for directly or indirectly inhibiting apoptosis in UFL-AG-286 cells.
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Affiliation(s)
- M E de Castro
- Embrapa Recursos Genéticos e Biotecnologia, Cx. Postal 02372, Brasília, DF, 70849-970, Brasil
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Ribeiro BM, Gatti CD, Costa MH, Moscardi F, Maruniak JE, Possee RD, Zanotto PM. Construction of a recombinant Anticarsia gemmatalis nucleopolyhedrovirus (AgMNPV-2D) harbouring the beta-galactosidase gene. Arch Virol 2001; 146:1355-67. [PMID: 11556711 DOI: 10.1007/s007050170096] [Citation(s) in RCA: 12] [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: 11/24/2022]
Abstract
We have constructed a transfer vector (pAgGal) containing the beta-galactosidase gene under control of the Escherichia coli gpt and AgMNPV polyhedrin (polh) promoters. The transfer vector was cotransfected with wild type Anticarsia gemmatalis nucleopolyhedrovirus (AgMNPV) DNA into A. gemmatalis (UFL-AG-286) cells and a recombinant baculovirus (vAgGalA2) was isolated. The beta-galactosidase gene insertion was checked by polymerase chain reaction (PCR) using DNA from AgMNPV and vAgGalA2 and primers specific for regions upstream and downstream of the polh gene. Insect cells (UFL-AG-286) were infected with the recombinant vAgGalA2 and wild type AgMNPV viruses and the production of the heterologous protein analyzed by SDS-PAGE and Pulse-Chase. Beta-galactosidase was expressed at high levels late on infection as expected for a gene under the control of the polh promoter. The highly expressed beta-galactosidase protein was also shown to be biologically active by a beta-galactosidase assay.
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Affiliation(s)
- B M Ribeiro
- Departamento de Biologia Celular, Universidade de Brasília-UnB, DF, Brazil
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Rodrigues JC, De Souza ML, O'Reilly D, Velloso LM, Pinedo FJ, Razuck FB, Ribeiro B, Ribeiro BM. Characterization of the ecdysteroid UDP-glucosyltransferase (egt) gene of Anticarsia gemmatalis nucleopolyhedrovirus. Virus Genes 2001; 22:103-12. [PMID: 11210933 DOI: 10.1023/a:1008142621359] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [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: 11/12/2022]
Abstract
The Anticarsia gemmatalis nucelopolyhedrovirus (AgMNPV) egt gene was cloned, sequenced and its expression characterized by RT-PCR and western blot analysis. Sequence analysis of the gene indicated the presence of an open reading frame (ORF) of 1482 nucleotides, which codes for a polypeptide of 494 amino acids. ATATA box and a conserved regulatory sequence (CATT) found in other baculovirus early genes were present in the promoter region of the egt gene. A poly-A consensus sequence was present in the 3' untranslated region (3'-UTR) of the gene. Homology comparisons showed that the EGT protein of AgMNPV is most closely related (95.9% amino acid sequence identity) to the EGT from the Choristoneura fumiferana DEF nucleopolyhedrovirus (CfDEF). Transcriptional analysis of the AgMNPV egt gene showed that egt-specific transcripts can be detected both early and late in infection. The EGT protein was detected, by western blot analysis, in the intra- (from 12 to 48 h post-infection) and extra-cellular (from 12 to 96 h post-infection) fractions of infected insect cells. The AgMNPV Bgl II-F fragment, which has homology to the AcMNPV ie-1 gene, was cloned and used to cotransfect SF21 cells with the cloned AgMNPV egt gene. EGT activity was observed, suggesting that AgMNPV ie-1 can transactivate egt expression.
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Affiliation(s)
- J C Rodrigues
- Embrapa Genetic Resources and Biotechnology, Brasília, Brasil.
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Marquez AM, Dias JM, Ribeiro BM. Screening and characterization of Bacillus thuringiensis isolates from Brazil for the presence of coleoptera-specific cry genes. Microbiol Res 2000; 154:355-62. [PMID: 10772158 DOI: 10.1016/s0944-5013(00)80010-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 10/15/2022]
Abstract
Forty-three Bacillus thuringiensis isolates from Brazil and 3 from Argentina were screened, using the polymerase chain reaction (PCR), for various coleoptera-specific cry genes. Seven isolates produced specific and/or nonspecific DNA fragments in a PCR reaction with primers specific for two coleopteran cry genes and 4 of these produced DNA fragments with primers specific for 7 known coleopteran cry genes. These isolates showed, by electron microscopy, the presence of spherical crystals. They also showed proteins of around 70 kDa which were immunologically similar to the Cry3Aa protein from B. thuringiensis subsp. tenebrionis. The 3 isolates from Argentina were toxic to T. molitor, and although no isolate from Brazil showed toxicity, they might show toxicity to another insect species.
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Affiliation(s)
- A M Marquez
- Departmento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Brazil
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Pombo V, Velloso LM, Ribeiro BM, Bao SN. Structural and ultrastructural changes during the infection of UFL-AG-286 cells with the baculovirus AgMNPV. J Invertebr Pathol 1998; 72:239-45. [PMID: 9784346 DOI: 10.1006/jipa.1998.4788] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
During infection of the permissive insect cell line UFL-AG-286 by the baculovirus Anticarsia gemmatalis nucleopolyhedrovirus (AgMNPV-2D) several morphological changes occur. By 12 h postinfection (h p.i.), the infected cells became round and exhibited a decrease in the number of cytoplasmic projections. By 24 h p.i., it was possible to detect a virogenic stroma inside the cell nucleus, and after 48 h p.i., polyhedral inclusion bodies were observed. Some of these morphological modifications are probably due to changes in the cytoskeleton of the cell and this possibility was substantiated by the observation that the distribution of actin and microtubules was dramatically modified upon infection. Several viral-induced proteins were also produced during infection and a sharp decrease in overall protein synthesis was observed. These results are very similar to those obtained with other cell lines infected with different baculoviruses, indicating a similar mechanism of infection. Copyright 1998 Academic Press.
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Affiliation(s)
- V Pombo
- Departamento de Biologia Celular, Universidade de Brasilia, Brasilia DF, 70919-970, Brazil
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Ribeiro BM, Crook NE. Construction of occluded recombinant baculoviruses containing the full-length cry1Ab and cry1Ac genes from Bacillus thuringiensis. Braz J Med Biol Res 1998; 31:763-9. [PMID: 9698820 DOI: 10.1590/s0100-879x1998000600006] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [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: 02/08/2023] Open
Abstract
The administration of baculoviruses to insects for bioassay purposes is carried out, in most cases, by contamination of food surfaces with a known amount of occlusion bodies (OBs). Sinceper os infection is the natural route of infection, occluded recombinant viruses containing crystal protein genes (cry1Ab and cry1Ac) from Bacillus thuringiensis were constructed for comparison with the baculovirus prototype Autographa californica nucleopolyhedrovirus (AcNPV). The transfer vector pAcUW2B was used for construction of occluded recombinant viruses. The transfer vector containing the crystal protein genes was cotransfected with linearized DNA from a non-occluded recombinant virus. The isolation of recombinant viruses was greatly facilitated by the reduction of background "wild type" virus and the increased proportion of recombinant viruses. Since the recombinant viruses containing full-length and truncated forms of the crystal protein genes did not seem to improve the pathogenicity of the recombinant viruses when compared with the wild type AcNPV, and in order to compare expression levels of the full-length crystal proteins produced by non-occluded and occluded recombinant viruses the full-length cry1Ab and cry1Ac genes were chosen for construction of occluded recombinant viruses. The recombinant viruses containing full-length and truncated forms of the crystal protein genes did not seem to improve its pathogenicity but the size of the larvae infected with the recombinant viruses was significantly smaller than that of larvae infected with the wild type virus.
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Affiliation(s)
- B M Ribeiro
- Horticulture Research International, Littlehampton, West Sussex, UK.
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Abstract
We have mapped the mutation responsible for the temperature-sensitive (ts) phenotype of tsB821, a mutant of the baculovirus Autographa californica nuclear polyhedrosis virus (H. H. Lee and L. K. Miller, J. Virol. 31:240-252, 1979), to a single nucleotide which changes alanine 432 of the multifunctional regulatory protein IE-1 to a valine. Mapping was done with a combination of marker rescue and transient expression assays, hybrid gene construction by overlap PCR gene splicing, and nucleotide sequence analysis. Cells infected with tsB821 at high multiplicities of infection showed a spectrum of responses from severe cytopathic effects, including apoptosis, to a lack of obvious signs of infection. Protein synthesis in tsB821-infected cells at the restrictive temperature appeared similar to uninfected cell protein synthesis, but viral DNA replication and budded virus production were observed, albeit in a delayed manner. The dependence of early and late promoter activity on the wild-type IE-1 gene, ie-1, was observed in transient expression assays. However, the dependence of early promoter activity on ie-1 was strongest in the absence of other viral genes. Thus, other viral genes appear to be able to compensate, at least in part, for the lack, or low levels, of ie-1 in transient expression assays using early promoters. The mutant should prove useful in further defining the function(s) of IE-1.
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Affiliation(s)
- B M Ribeiro
- Department of Entomology, University of Georgia, Athens 30602
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Ribeiro BM, Crook NE. Expression of full-length and truncated forms of crystal protein genes from Bacillus thuringiensis subsp. kurstaki in a baculovirus and pathogenicity of the recombinant viruses. J Invertebr Pathol 1993; 62:121-30. [PMID: 8228317 DOI: 10.1006/jipa.1993.1087] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [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: 01/29/2023]
Abstract
Full-length and truncated forms of the crystal protein gene cryIA(b) derived from Bacillus thuringiensis subsp. kurstaki HD-1 and full-length cryIA(c) gene of B. thuringiensis subsp. kurstaki HD-73 were introduced into the genome of the baculovirus Autographa californica nuclear polyhedrosis virus, in place of the polyhedrin gene. All gene constructs were expressed at high levels in insect cells and insects upon infection with the recombinant viruses. The protein products were shown to be biologically and immunologically similar to the natural crystal protein. The expressed proteins formed crystals (in insects) up to 10 times bigger (in length) than their bacterial counterpart. The LT50 values for recombinant viruses were not significantly shorter than wild-type virus.
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Affiliation(s)
- B M Ribeiro
- Horticulture Research International, Littlehampton, West Sussex, United Kingdom
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