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Shen Z, Yang Q, Luo L, Li T, Ke Z, Li T, Chen J, Meng X, Xiang H, Li C, Zhou Z, Chen P, Pan G. Non-coding RNAs identification and regulatory networks in pathogen-host interaction in the microsporidia congenital infection. BMC Genomics 2023; 24:420. [PMID: 37495972 PMCID: PMC10373312 DOI: 10.1186/s12864-023-09490-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 06/28/2023] [Indexed: 07/28/2023] Open
Abstract
BACKGROUND The interaction networks between coding and non-coding RNAs (ncRNAs) including long non-coding RNA (lncRNA), covalently closed circular RNA (circRNA) and miRNA are significant to elucidate molecular processes of biological activities and interactions between host and pathogen. Congenital infection caused by vertical transmission of microsporidia N. bombycis can result in severe economic losses in the silkworm-feeding industry. However, little is known about ncRNAs that take place in the microsporidia congenital infection. Here we conducted whole-transcriptome RNA-Seq analyses to identify ncRNAs and regulatory networks for both N. bombycis and host including silkworm embryos and larvae during the microsporidia congenital infection. RESULTS A total of 4,171 mRNAs, 403 lncRNA, 62 circRNAs, and 284 miRNAs encoded by N. bombycis were identified, among which some differentially expressed genes formed cross-talk and are involved in N. bombycis proliferation and infection. For instance, a lncRNA/circRNA competing endogenous RNA (ceRNA) network including 18 lncRNAs, one circRNA, and 20 miRNAs was constructed to describe 14 key parasites genes regulation, such as polar tube protein 3 (PTP3), ricin-B-lectin, spore wall protein 4 (SWP4), and heat shock protein 90 (HSP90). Regarding host silkworm upon N. bombycis congenital infection, a total of 14,889 mRNAs, 3,038 lncRNAs, 19,039 circRNAs, and 3,413 miRNAs were predicted based on silkworm genome with many differentially expressed coding and non-coding genes during distinct developmental stages. Different species of RNAs form interacting network to modulate silkworm biological processes, such as growth, metamorphosis and immune responses. Furthermore, a lncRNA/circRNA ceRNA network consisting of 140 lncRNAs, five circRNA, and seven miRNAs are constructed hypothetically to describe eight key host genes regulation, such as Toll-6, Serpin-6, inducible nitric oxide synthase (iNOS) and Caspase-8. Notably, cross-species analyses indicate that parasite and host miRNAs play a vital role in pathogen-host interaction in the microsporidia congenital infection. CONCLUSION This is the first comprehensive pan-transcriptome study inclusive of both N. bombycis and its host silkworm with a specific focus on the microsporidia congenital infection, and show that ncRNA-mediated regulation plays a vital role in the microsporidia congenital infection, which provides a new insight into understanding the basic biology of microsporidia and pathogen-host interaction.
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Affiliation(s)
- Zigang Shen
- State Key Laboratory of Resource Insects, Southwest University, Tiansheng Street, Chongqing, 400715, People's Republic of China
- College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, People's Republic of China
- Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, People's Republic of China
| | - Qiong Yang
- Sericulture and Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, People's Republic of China
| | - Lie Luo
- State Key Laboratory of Resource Insects, Southwest University, Tiansheng Street, Chongqing, 400715, People's Republic of China
- Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, People's Republic of China
| | - Tangxin Li
- State Key Laboratory of Resource Insects, Southwest University, Tiansheng Street, Chongqing, 400715, People's Republic of China
- Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, People's Republic of China
| | - Zhuojun Ke
- State Key Laboratory of Resource Insects, Southwest University, Tiansheng Street, Chongqing, 400715, People's Republic of China
- Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, People's Republic of China
| | - Tian Li
- State Key Laboratory of Resource Insects, Southwest University, Tiansheng Street, Chongqing, 400715, People's Republic of China
- Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, People's Republic of China
| | - Jie Chen
- State Key Laboratory of Resource Insects, Southwest University, Tiansheng Street, Chongqing, 400715, People's Republic of China
- Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, People's Republic of China
| | - Xianzhi Meng
- State Key Laboratory of Resource Insects, Southwest University, Tiansheng Street, Chongqing, 400715, People's Republic of China
- Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, People's Republic of China
| | - Heng Xiang
- College of Animal Science and Technology, Southwest University, Chongqing, People's Republic of China
| | - Chunfeng Li
- State Key Laboratory of Resource Insects, Southwest University, Tiansheng Street, Chongqing, 400715, People's Republic of China
- Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, People's Republic of China
| | - Zeyang Zhou
- State Key Laboratory of Resource Insects, Southwest University, Tiansheng Street, Chongqing, 400715, People's Republic of China
- Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, People's Republic of China
- College of Life Sciences, Chongqing Normal University, Chongqing, People's Republic of China
| | - Ping Chen
- State Key Laboratory of Resource Insects, Southwest University, Tiansheng Street, Chongqing, 400715, People's Republic of China.
- College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, People's Republic of China.
| | - Guoqing Pan
- State Key Laboratory of Resource Insects, Southwest University, Tiansheng Street, Chongqing, 400715, People's Republic of China.
- Chongqing Key Laboratory of Microsporidia Infection and Control, Southwest University, Chongqing, People's Republic of China.
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Jordan C, de Carvalho VR, Mascarin GM, Dos Santos Oliveira LR, Dunlap CA, Wilcken CF. First record of a new microsporidium pathogenic to Gonipterus platensis in Brazil. Sci Rep 2021; 11:10971. [PMID: 34040020 PMCID: PMC8155060 DOI: 10.1038/s41598-021-90041-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Accepted: 04/12/2021] [Indexed: 11/22/2022] Open
Abstract
Microsporidia are naturally occurring fungal-related parasites that can infect nearly all animal hosts, but their biocontrol potential of insect pests is routinely overlooked in agriculture and forestry. This research brings the first report describing the natural occurrence of a microsporidium causing disease in field-collected populations of the invasive eucalyptus snout beetle, Gonipterus platensis (Coleoptera: Curculionidae), a major destructive pest of eucalyptus plantations in Brazil. Adult beetles were collected during field surveys in commercial eucalyptus plantations in southern Brazil to be examined and dissected with typical symptoms to verify presence of microsporidian spores in haemolymph. From 14 plantations in different sites, the natural infection occurrence in these populations ranged from 0 to 65%, while a lab colony exhibited an infection incidence of 70%. Spore density in haemolymph of symptomatic insects averaged 2.1 (± 0.4) × 107 spores/beetle. Symptoms in infected adults were identified by an abnormal abdomen with malformation of the second pair of wings, impairing their flight activity. Electron transmission microscopy of the pathogen showed morphological features similar to species belonging to the genus Nosema or Vairimorpha. Phylogenetic analysis of the full-length small subunit ribosomal RNA gene suggests this pathogen's placement in the genus Vairimorpha, but with a sequence identity of ~ 94% with the nearest neighbours. The low level of sequence identity suggests this pathogen may represent a novel taxon in the genus and further requires whole genome sequencing for definitive taxonomic resolution. These findings provide insights on the natural occurrence of this novel pathogen of this invasive pest in Eucalyptus plantations in Brazil. Further studies are needed to determine potential of this microsporidium in the design of conservative or augmentative biological control programs for this invasive pest.
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Affiliation(s)
- Carolina Jordan
- School of Agricultural Sciences, São Paulo State University (UNESP), Campus of Botucatu, Av. Universitária, 3780, Altos do Paraíso, Fazenda Experimental Lageado, Botucatu, SP, 18610-034, Brazil.
| | - Vanessa Rafaela de Carvalho
- School of Agricultural Sciences, São Paulo State University (UNESP), Campus of Botucatu, Av. Universitária, 3780, Altos do Paraíso, Fazenda Experimental Lageado, Botucatu, SP, 18610-034, Brazil
| | - Gabriel Moura Mascarin
- Laboratory of Environmental Microbiology, Brazilian Agricultural Research Corporation, Embrapa Environment, Rodovia SP-340, km 127.5, Jaguariúna, SP, 13918-110, Brazil.
| | - Leiliane Rodrigues Dos Santos Oliveira
- Botucatu Medical School, Dept. Internal Medicine, Sao Paulo State University (UNESP), Campus of Botucatu, Av. Prof. Mário Rubens Guimarães Montenegro, s/n, Botucatu, SP, 18618-687, Brazil
| | - Christopher A Dunlap
- USDA, Agricultural Research Service, National Center for Agricultural Utilization Research, Crop Bioprotection Research Unit, 1815, N. University St, Peoria, IL, 61604, USA
| | - Carlos Frederico Wilcken
- School of Agricultural Sciences, São Paulo State University (UNESP), Campus of Botucatu, Av. Universitária, 3780, Altos do Paraíso, Fazenda Experimental Lageado, Botucatu, SP, 18610-034, Brazil
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The Genome of Nosema sp. Isolate YNPr: A Comparative Analysis of Genome Evolution within the Nosema/Vairimorpha Clade. PLoS One 2016; 11:e0162336. [PMID: 27598992 PMCID: PMC5012567 DOI: 10.1371/journal.pone.0162336] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Accepted: 08/22/2016] [Indexed: 01/13/2023] Open
Abstract
The microsporidian parasite designated here as Nosema sp. Isolate YNPr was isolated from the cabbage butterfly Pieris rapae collected in Honghe Prefecture, Yunnan Province, China. The genome was sequenced by Illumina sequencing and compared to those of two related members of the Nosema/Vairimorpha clade, Nosema ceranae and Nosema apis. Based upon assembly statistics, the Nosema sp. YNPr genome is 3.36 x 106bp with a G+C content of 23.18% and 2,075 protein coding sequences. An “ACCCTT” motif is present approximately 50-bp upstream of the start codon, as reported from other members of the clade and from Encephalitozoon cuniculi, a sister taxon. Comparative small subunit ribosomal DNA (SSU rDNA) analysis as well as genome-wide phylogenetic analysis confirms a closer relationship between N. ceranae and Nosema sp. YNPr than between the two honeybee parasites N. ceranae and N. apis. The more closely related N. ceranae and Nosema sp. YNPr show similarities in a number of structural characteristics such as gene synteny, gene length, gene number, transposon composition and gene reduction. Based on transposable element content of the assemblies, the transposon content of Nosema sp. YNPr is 4.8%, that of N. ceranae is 3.7%, and that of N. apis is 2.5%, with large differences in the types of transposons present among these 3 species. Gene function annotation indicates that the number of genes participating in most metabolic activities is similar in all three species. However, the number of genes in the transcription, general function, and cysteine protease categories is greater in N. apis than in the other two species. Our studies further characterize the evolution of the Nosema/Vairimorpha clade of microsporidia. These organisms maintain variable but very reduced genomes. We are interested in understanding the effects of genetic drift versus natural selection on genome size in the microsporidia and in developing a testable hypothesis for further studies on the genomic ecology of this group.
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Araújo J, Hughes D. Diversity of Entomopathogenic Fungi. GENETICS AND MOLECULAR BIOLOGY OF ENTOMOPATHOGENIC FUNGI 2016; 94:1-39. [DOI: 10.1016/bs.adgen.2016.01.001] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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Michalakis Y, Bédhomme S, Biron DG, Rivero A, Sidobre C, Agnew P. Virulence and resistance in a mosquito-microsporidium interaction. Evol Appl 2015; 1:49-56. [PMID: 25567490 PMCID: PMC3352405 DOI: 10.1111/j.1752-4571.2007.00004.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/18/2007] [Indexed: 12/04/2022] Open
Abstract
We review the results of a series of experiments involving Aedes aegypti and its microsporidian parasite Vavraia culicis to illustrate how intra-specific competition and parasitism shape life history traits. More specifically these experiments showed that some major components of virulence are host condition-dependent in this system, while others are not. We also briefly discuss the ways through which V. culicis modifies the physiological functioning of its host. We discuss the implications of these results for studies of host – parasite interactions in general and propose ways through which our studies could contribute to vector control and management programs.
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Affiliation(s)
- Yannis Michalakis
- Génétique et Evolution des Maladies Infectieuses, UMR CNRS - IRD Montpellier CEDEX 1, France
| | - Stéphanie Bédhomme
- Génétique et Evolution des Maladies Infectieuses, UMR CNRS - IRD Montpellier CEDEX 1, France
| | - David G Biron
- Génétique et Evolution des Maladies Infectieuses, UMR CNRS - IRD Montpellier CEDEX 1, France
| | - Ana Rivero
- Génétique et Evolution des Maladies Infectieuses, UMR CNRS - IRD Montpellier CEDEX 1, France
| | - Christine Sidobre
- Génétique et Evolution des Maladies Infectieuses, UMR CNRS - IRD Montpellier CEDEX 1, France
| | - Philip Agnew
- Génétique et Evolution des Maladies Infectieuses, UMR CNRS - IRD Montpellier CEDEX 1, France
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Haag KL, Traunecker E, Ebert D. Single-nucleotide polymorphisms of two closely related microsporidian parasites suggest a clonal population expansion after the last glaciation. Mol Ecol 2012; 22:314-26. [PMID: 23163569 DOI: 10.1111/mec.12126] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 10/03/2012] [Accepted: 10/07/2012] [Indexed: 11/27/2022]
Abstract
The mode of reproduction of microsporidian parasites has remained puzzling since many decades. It is generally accepted that microsporidia are capable of sexual reproduction, and that some species have switched to obligate asexuality, but such process had never been supported with population genetic evidence. We examine the mode of reproduction of Hamiltosporidium tvaerminnensis and Hamiltosporidium magnivora, two closely related microsporidian parasites of the widespread freshwater crustacean Daphnia magna, based on a set of 129 single-nucleotide polymorphisms distributed across 16 genes. We analyse 20 H. tvaerminnensis isolates from localities representative of the entire species' geographic distribution along the Skerry Island belt of the Baltic Sea. Five isolates of the sister species H. magnivora were used for comparison. We estimate the recombination rates in H. tvaerminnensis to be at least eight orders of magnitude lower than in H. magnivora and not significantly different from zero. This is corroborated by the higher divergence between H. tvaerminnensis alleles (including fixed heterozygosity), as compared to H. magnivora. Our study confirms that sexual recombination is present in microsporidia, that it can be lost, and that asexuals may become epidemic.
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Affiliation(s)
- Karen L Haag
- Zoological Institute, University of Basel, Vesalgasse 1, CH-4051, Basel, Switzerland.
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8
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Sokolova YY, Sokolov IM, Carlton CE. New microsporidia parasitizing bark lice (Insecta: Psocoptera). J Invertebr Pathol 2010; 104:186-94. [DOI: 10.1016/j.jip.2010.03.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2009] [Revised: 03/10/2010] [Accepted: 03/25/2010] [Indexed: 11/29/2022]
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9
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Cucumispora dikerogammari n. gen. (Fungi: Microsporidia) infecting the invasive amphipod Dikerogammarus villosus: a potential emerging disease in European rivers. Parasitology 2009; 137:191-204. [PMID: 19765341 DOI: 10.1017/s0031182009991119] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Dikerogammarus villosus is an invasive amphipod that recently colonized the main rivers of Central and Western Europe. Two frequent microsporidian parasites were previously detected in this species, but their taxonomic status was unclear. Here we present ultrastructural and molecular data indicating that these two parasites are in fact a single microsporidian species. This parasite shares numerous characteristics of Nosema spp. It forms elongate spores (cucumiform), developing in direct contact with host cell cytoplasm; all developmental stages are diplokaryotic and the life cycle is monomorphic with disporoblastic sporogony. Initially this parasite was described as Nosema dikerogammari Ovcharenko and Kurandina 1987. However, phylogenetic analysis based on the complete sequence of SSU rDNA places the parasite outside the genus Nosema and it is therefore ascribed to a new genus Cucumispora. The key features characteristic to this genus are: presence of a very well-developed, umbrella-shape anchoring disk covering the anterior part of polaroplast; arrangement of isofilar polar filament into 6-8 coils convoluted with different angles, voluminous diplokaryon, thin spore wall and relatively small posterior vacuole containing posterosome. The parasite infects most host tissues but mainly muscles. It showed high rates of horizontal trophic transmission and lower rates of vertical transmission.
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Roth O, Sadd BM, Schmid-Hempel P, Kurtz J. Strain-specific priming of resistance in the red flour beetle, Tribolium castaneum. Proc Biol Sci 2009; 276:145-51. [PMID: 18796392 DOI: 10.1098/rspb.2008.1157] [Citation(s) in RCA: 163] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
As invertebrates lack the molecular machinery employed by the vertebrate adaptive immune system, it was thought that they consequently lack the ability to produce lasting and specific immunity. However, in recent years, it has been demonstrated that the immune defence of invertebrates is by far more complicated and specific than previously envisioned. Lasting immunity following an initial exposure that proves protection on a secondary exposure has been shown in several species of invertebrates. This phenomenon has become known as immune priming. In the cases where it is explicitly tested, this priming can also be highly specific. In this study, we used survival assays to test for specific priming of resistance in the red flour beetle, Tribolium castaneum, using bacteria of different degrees of relatedness. Our results suggest an unexpected degree of specificity that even allows for differentiation between different strains of the same bacterium. However, our findings also demonstrate that specific priming of resistance in insects may not be ubiquitous across all bacteria.
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Affiliation(s)
- Olivia Roth
- Institute for Integrative Biology, Experimental Ecology, Universitätsstrasse 16, ETH-Zentrum, 8092 Zürich, Switzerland.
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ROTH O, KURTZ J. The stimulation of immune defence accelerates development in the red flour beetle (Tribolium castaneum). J Evol Biol 2008; 21:1703-10. [DOI: 10.1111/j.1420-9101.2008.01584.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Koella, Agnew. A correlated response of a parasite’s virulence and life cycle to selection on its host’s life history. J Evol Biol 2008. [DOI: 10.1046/j.1420-9101.1999.00010.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Koella
- Department of Zoology, University of Aarhus, Universitetsparken B135, DK‐8000 Århus C, Denmark
| | - Agnew
- Department of Zoology, University of Aarhus, Universitetsparken B135, DK‐8000 Århus C, Denmark
- Experimental Ecology, ETH Zürich, ETH Zentrum NW, CH‐8092 Zürich, Switzerland
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Nascimento ES, Figueiró R, Becnel JJ, Araújo-Coutinho CJPC. Influence of temperature on microsporidia infections in a natural population of Simulium pertinax Kollar, 1832 (Diptera; Simuliidae). BRAZ J BIOL 2008; 67:519-26. [PMID: 18094835 DOI: 10.1590/s1519-69842007000300017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2005] [Accepted: 05/22/2006] [Indexed: 11/21/2022] Open
Abstract
During the studies involving the correlation between the water temperature of the breeding site of Simulium pertinax larvae and the infection prevalence by microsporidia, developed in the Andorinhas river, Magé, RJ, weekly samples of blackfly larvae were taken within a two-year period (2001-2002 and 2003-2004), and it was noticed that the infections by Amblyospora sp. were more prevalent when compared to infections by Polydispyrenia sp. in larvae. It was also observed that the infections do not follow the same pattern, since the genus Amblyospora was recorded almost every month during the study with the exception of December, 2001. In the results of correlation between the environmental water temperature and the microsporidia infection rates, it was observed that for the first period studied, there was a high negative correlation, while during the second period there was absence correlation. On the other hand, the Amblyospora sp. infection rates prove that the correlation was high and significant in the first period, but was not significant in the second sampling period and Polydispyrenia sp. showed absence correlation in both periods.
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Affiliation(s)
- E S Nascimento
- Laboratório de Referência Nacional em Simulídeos e Oncocercose, Departamento de Entomologia, Instituto Oswaldo Cruz, Rio de Janeiro, RJ 21045-900, Brazil.
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Becnel JJ, White SE, Shapiro AM. Review of microsporidia-mosquito relationships: from the simple to the complex. Folia Parasitol (Praha) 2005. [DOI: 10.14411/fp.2005.006] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Abstract
Biological agents have not found wide application in the control of insects that transmit agents of human disease. Fungal pathogens may have a potential for field use, but environmental constraints, lack of knowledge of their life cycle, or dependence on production in vivo, have prevented their widespread use. In fact, sporogenous bacteria are the only biological agents used on a large scale for the control of mosquitoes and blackflies that transmit diseases in the tropics. Two bacteria, Bacillus thuringiensis sp. israelensis and B. sphaericus are very effective for the control of these vectors. In this article, Jean Marc Hougard and Christian Back discuss various factors associated with the use of bacteria for vector control, and the prospects for further developments.
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Affiliation(s)
- J M Hougard
- Vector Control Unit of the Health Department of ORSTOM, BP 2528, Bamako, Mali, West Africa
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Ginarte CA, Andrade CFS, Gaona JC. Larvas de simulídeos (Diptera, Simuliidae) do centro oeste, sudeste e sul do Brasil, parasitadas por microsporídeos (Protozoa) e mermitídeos (Nematoda). IHERINGIA. SERIE ZOOLOGIA 2003. [DOI: 10.1590/s0073-47212003000300011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Parasites and their infections can adversely effect a host's growth, reproduction and survival. These effects are often not immediate, but increase with time since infection. A general prediction from evolutionary biology is that hosts suffering from this type of infection should preferentially allocate resources towards reproduction, even if this is at the expense of their growth and survival. This review illustrates this argument with several empirical studies showing hosts behaving in this manner. These studies indicate that one way for hosts to reduce the costs of parasitism is by altering their life history traits to bring forward their schedule of reproduction.
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Affiliation(s)
- P Agnew
- Fonctionnement et évolution des systèmes écologiques, CNRS-UMR 7625, Université Pierre et Marie Curie, 7, quai St Bernard (cc237) Paris, France
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West DF, Black WC. Breeding structure of three snow pool Aedes mosquito species in northern Colorado. Heredity (Edinb) 1998; 81 ( Pt 4):371-80. [PMID: 9839435 DOI: 10.1046/j.1365-2540.1998.00387.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
RAPD-PCR polymorphisms were used to examine breeding structure in three species of snow pool Aedes mosquitoes across three river drainages in northern Colorado. Larvae were collected from four snow pools for Aedes cataphylla Dyar, seven pools for A. hexodontus Dyar and six pools for A. pullatus (Coquillet). Polymorphisms were scored at 47-48 RAPD loci in each species. To test for isolation by distance, FST/(1-FST) values between pairs of pools were plotted against geographical distances and subjected to a Mantel test with 1000 random permutations. FST values were independent of geographical distances in A. cataphylla and A. hexodontus but were somewhat correlated in A. pullatus suggesting isolation by distance in this species. A cluster analysis was performed on pair-wise FST values among pools including seven pools that were sampled in both 1994 and 1995. Bootstrap analysis indicated that pools clustered across drainages and generally independently of geographical proximity. However, there was consistent support for clustering of larvae collected from the same pool across years in A. cataphylla and in high altitude collections of A. pullatus. Mountains do not appear to act as major barriers to gene flow in any of these species. Instead, seasonal differences in adult emergence may serve as barriers to migration among A. pullatus and A. cataphylla populations. Larvae of A. hexodontus are distributed continuously in grassy pools along the banks of rivers and genetic drift probably occurs through random larval mortality when these pools are washed out during spring run-off.
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Affiliation(s)
- D F West
- Department of Microbiology, Colorado State University, Fort Collins 80523, USA
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Fallon AM. Transgenic insect cells: mosquito cell mutants and the dihydrofolate reductase gene. Cytotechnology 1996; 20:23-31. [PMID: 8987577 DOI: 10.1007/bf00350386] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Affiliation(s)
- A M Fallon
- Department of Entomology, University of Minnesota, St. Paul 55108, USA
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Garcia JJ, Becnel JJ. Eight new species of microsporidia (Microspora) from argentine mosquitoes (Diptera: Culicidae). J Invertebr Pathol 1994. [DOI: 10.1016/s0022-2011(94)90350-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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ANDREADIS THEODOREG. Ultrastructural Characterization of Meiospores of Six New Species of Amblyospora (Microsporida: Amblyosporidae) from Northern Aedes (Diptera: Culicidae) Mosquitoes. J Eukaryot Microbiol 1994. [DOI: 10.1111/j.1550-7408.1994.tb01488.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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