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M3i
Modèles Insectes d’Immunité Innée
Publications
2017
Volohonsky Gloria, Hopp Ann-Katrin, Saenger Mélanie, Soichot Julien, Scholze Heidi, Boch Jens, Blandin Stéphanie A, Marois Eric
Transgenic Expression of the Anti-parasitic Factor TEP1 in the Malaria Mosquito Anopheles gambiae Article de journal
Dans: PLOS Pathogens, vol. 13, no. 1, p. e1006113, 2017, ISSN: 1553-7374.
Liens | BibTeX | Étiquettes: Anopheles gambiae, anti-parasitic factor, blandin, M3i, Malaria, marois, TEP1, transgenic
@article{volohonsky_transgenic_2017,
title = {Transgenic Expression of the Anti-parasitic Factor TEP1 in the Malaria Mosquito Anopheles gambiae},
author = {Gloria Volohonsky and Ann-Katrin Hopp and Mélanie Saenger and Julien Soichot and Heidi Scholze and Jens Boch and Stéphanie A Blandin and Eric Marois},
editor = {Kenneth D Vernick},
url = {http://dx.plos.org/10.1371/journal.ppat.1006113},
doi = {10.1371/journal.ppat.1006113},
issn = {1553-7374},
year = {2017},
date = {2017-01-01},
urldate = {2017-02-01},
journal = {PLOS Pathogens},
volume = {13},
number = {1},
pages = {e1006113},
keywords = {Anopheles gambiae, anti-parasitic factor, blandin, M3i, Malaria, marois, TEP1, transgenic},
pubstate = {published},
tppubtype = {article}
}
2015
Pompon Julien, Levashina Elena A
A New Role of the Mosquito Complement-like Cascade in Male Fertility in Anopheles gambiae Article de journal
Dans: PLoS Biology, vol. 13, no. 9, p. e1002255, 2015.
Résumé | Liens | BibTeX | Étiquettes: Anopheles gambiae, TEP1
@article{J2015,
title = {A New Role of the Mosquito Complement-like Cascade in Male Fertility in Anopheles gambiae},
author = {Julien Pompon and Elena A Levashina},
url = {http://www.ncbi.nlm.nih.gov/pubmed/26394016},
year = {2015},
date = {2015-09-22},
journal = {PLoS Biology},
volume = {13},
number = {9},
pages = {e1002255},
abstract = {Thioester-containing protein 1 (TEP1) is a key immune factor that determines mosquito resistance to a wide range of pathogens, including malaria parasites. Here we report a new allele-specific function of TEP1 in male fertility. We demonstrate that during spermatogenesis TEP1 binds to and removes damaged cells through the same complement-like cascade that kills malaria parasites in the mosquito midgut. Further, higher fertility rates are mediated by an allele that renders the mosquito susceptible to Plasmodium. By elucidating the molecular and genetic mechanisms underlying TEP1 function in spermatogenesis, our study suggests that pleiotropic antagonism between reproduction and immunity may shape resistance of mosquito populations to malaria parasites.},
keywords = {Anopheles gambiae, TEP1},
pubstate = {published},
tppubtype = {article}
}
Thioester-containing protein 1 (TEP1) is a key immune factor that determines mosquito resistance to a wide range of pathogens, including malaria parasites. Here we report a new allele-specific function of TEP1 in male fertility. We demonstrate that during spermatogenesis TEP1 binds to and removes damaged cells through the same complement-like cascade that kills malaria parasites in the mosquito midgut. Further, higher fertility rates are mediated by an allele that renders the mosquito susceptible to Plasmodium. By elucidating the molecular and genetic mechanisms underlying TEP1 function in spermatogenesis, our study suggests that pleiotropic antagonism between reproduction and immunity may shape resistance of mosquito populations to malaria parasites.
Volohonsky Gloria, Terenzi Olivier, Soichot Julien, Naujoks Daniel A, Nolan Tony, Windbichler Nikolai, Kapps Delphine, Smidler Andie L, Vittu Anaïs, Costa Giulia, Steinert Stefanie, Levashina Elena A, Blandin Stéphanie A, Marois Eric
Tools for Anopheles gambiae Transgenesis Article de journal
Dans: G3 (Bethesda), vol. 5, no. 6, p. 1151-63, 2015.
Résumé | Liens | BibTeX | Étiquettes: Anopheles gambiae, bioinformatic, blandin, M3i, marois, transgenesis
@article{G2015,
title = {Tools for Anopheles gambiae Transgenesis},
author = {Gloria Volohonsky and Olivier Terenzi and Julien Soichot and Daniel A Naujoks and Tony Nolan and Nikolai Windbichler and Delphine Kapps and Andie L Smidler and Anaïs Vittu and Giulia Costa and Stefanie Steinert and Elena A Levashina and Stéphanie A Blandin and Eric Marois},
url = {http://www.ncbi.nlm.nih.gov/pubmed/25869647},
year = {2015},
date = {2015-04-13},
journal = {G3 (Bethesda)},
volume = {5},
number = {6},
pages = {1151-63},
abstract = {Transgenesis is an essential tool to investigate gene function and to introduce desired characters in laboratory organisms. Setting-up transgenesis in non-model organisms is challenging due to the diversity of biological life traits and due to knowledge gaps in genomic information. Some procedures will be broadly applicable to many organisms, and others have to be specifically developed for the target species. Transgenesis in disease vector mosquitoes has existed since the 2000s but has remained limited by the delicate biology of these insects. Here, we report a compilation of the transgenesis tools that we have designed for the malaria vector Anopheles gambiae, including new docking strains, convenient transgenesis plasmids, a puromycin resistance selection marker, mosquitoes expressing cre recombinase, and various reporter lines defining the activity of cloned promoters. This toolbox contributed to rendering transgenesis routine in this species and is now enabling the development of increasingly refined genetic manipulations such as targeted mutagenesis. Some of the reagents and procedures reported here are easily transferable to other nonmodel species, including other disease vector or agricultural pest insects.},
keywords = {Anopheles gambiae, bioinformatic, blandin, M3i, marois, transgenesis},
pubstate = {published},
tppubtype = {article}
}
Transgenesis is an essential tool to investigate gene function and to introduce desired characters in laboratory organisms. Setting-up transgenesis in non-model organisms is challenging due to the diversity of biological life traits and due to knowledge gaps in genomic information. Some procedures will be broadly applicable to many organisms, and others have to be specifically developed for the target species. Transgenesis in disease vector mosquitoes has existed since the 2000s but has remained limited by the delicate biology of these insects. Here, we report a compilation of the transgenesis tools that we have designed for the malaria vector Anopheles gambiae, including new docking strains, convenient transgenesis plasmids, a puromycin resistance selection marker, mosquitoes expressing cre recombinase, and various reporter lines defining the activity of cloned promoters. This toolbox contributed to rendering transgenesis routine in this species and is now enabling the development of increasingly refined genetic manipulations such as targeted mutagenesis. Some of the reagents and procedures reported here are easily transferable to other nonmodel species, including other disease vector or agricultural pest insects.
2014
Baldini Francesco, Segata N, Pompon Julien, Marcenac P, Shaw W R, Dabire R, Diabate A, Levashina Elena A, Catteruccia Flaminia
Evidence of natural Wolbachia infections in field populations of Anopheles gambiae Article de journal
Dans: Nature Commun., vol. 5, p. 3985, 2014.
Résumé | Liens | BibTeX | Étiquettes: Anopheles gambiae, field, Wolbachia
@article{F2014,
title = {Evidence of natural Wolbachia infections in field populations of Anopheles gambiae},
author = {Francesco Baldini and N Segata and Julien Pompon and P Marcenac and W R Shaw and R Dabire and A Diabate and Elena A Levashina and Flaminia Catteruccia},
url = {http://www.ncbi.nlm.nih.gov/pubmed/24905191},
year = {2014},
date = {2014-06-06},
journal = {Nature Commun.},
volume = {5},
pages = {3985},
abstract = {Wolbachia are maternally transmitted intracellular bacteria that invade insect populations by manipulating their reproduction and immunity and thus limiting the spread of numerous human pathogens. Experimental Wolbachia infections can reduce Plasmodium numbers in Anopheles mosquitoes in the laboratory, however, natural Wolbachia infections in field anophelines have never been reported. Here we show evidence of Wolbachia infections in Anopheles gambiae in Burkina Faso, West Africa. Sequencing of the 16S rRNA gene identified Wolbachia sequences in both female and male germlines across two seasons, and determined that these sequences are vertically transmitted from mother to offspring. Whole-genome sequencing of positive samples suggests that the genetic material identified in An. gambiae belongs to a novel Wolbachia strain, related to but distinct from strains infecting other arthropods. The evidence of Wolbachia infections in natural Anopheles populations promotes further investigations on the possible use of natural Wolbachia-Anopheles associations to limit malaria transmission.},
keywords = {Anopheles gambiae, field, Wolbachia},
pubstate = {published},
tppubtype = {article}
}
Wolbachia are maternally transmitted intracellular bacteria that invade insect populations by manipulating their reproduction and immunity and thus limiting the spread of numerous human pathogens. Experimental Wolbachia infections can reduce Plasmodium numbers in Anopheles mosquitoes in the laboratory, however, natural Wolbachia infections in field anophelines have never been reported. Here we show evidence of Wolbachia infections in Anopheles gambiae in Burkina Faso, West Africa. Sequencing of the 16S rRNA gene identified Wolbachia sequences in both female and male germlines across two seasons, and determined that these sequences are vertically transmitted from mother to offspring. Whole-genome sequencing of positive samples suggests that the genetic material identified in An. gambiae belongs to a novel Wolbachia strain, related to but distinct from strains infecting other arthropods. The evidence of Wolbachia infections in natural Anopheles populations promotes further investigations on the possible use of natural Wolbachia-Anopheles associations to limit malaria transmission.
Bernardini F, Galizi R, Menichelli M, Papathanos P A, Dritsou V, Marois Eric, Crisanti Andrea, Windbichler Nikolai
Site-specific genetic engineering of the Anopheles gambiae Y chromosome Article de journal
Dans: Proc Natl Acad Sci U S A., vol. 111, no. 21, p. 7600-5, 2014.
Résumé | Liens | BibTeX | Étiquettes: Anopheles gambiae, Biotechnology, M3i, marois, SIT, transgenesis
@article{F2014b,
title = {Site-specific genetic engineering of the Anopheles gambiae Y chromosome},
author = {F Bernardini and R Galizi and M Menichelli and P A Papathanos and V Dritsou and Eric Marois and Andrea Crisanti and Nikolai Windbichler},
url = {http://www.ncbi.nlm.nih.gov/pubmed/24821795},
year = {2014},
date = {2014-05-27},
journal = {Proc Natl Acad Sci U S A.},
volume = {111},
number = {21},
pages = {7600-5},
abstract = {Despite its function in sex determination and its role in driving genome evolution, the Y chromosome remains poorly understood in most species. Y chromosomes are gene-poor, repeat-rich and largely heterochromatic and therefore represent a difficult target for genetic engineering. The Y chromosome of the human malaria vector Anopheles gambiae appears to be involved in sex determination although very little is known about both its structure and function. Here, we characterize a transgenic strain of this mosquito species, obtained by transposon-mediated integration of a transgene construct onto the Y chromosome. Using meganuclease-induced homologous repair we introduce a site-specific recombination signal onto the Y chromosome and show that the resulting docking line can be used for secondary integration. To demonstrate its utility, we study the activity of a germ-line-specific promoter when located on the Y chromosome. We also show that Y-linked fluorescent transgenes allow automated sex separation of this important vector species, providing the means to generate large single-sex populations. Our findings will aid studies of sex chromosome function and enable the development of male-exclusive genetic traits for vector control.},
keywords = {Anopheles gambiae, Biotechnology, M3i, marois, SIT, transgenesis},
pubstate = {published},
tppubtype = {article}
}
Despite its function in sex determination and its role in driving genome evolution, the Y chromosome remains poorly understood in most species. Y chromosomes are gene-poor, repeat-rich and largely heterochromatic and therefore represent a difficult target for genetic engineering. The Y chromosome of the human malaria vector Anopheles gambiae appears to be involved in sex determination although very little is known about both its structure and function. Here, we characterize a transgenic strain of this mosquito species, obtained by transposon-mediated integration of a transgene construct onto the Y chromosome. Using meganuclease-induced homologous repair we introduce a site-specific recombination signal onto the Y chromosome and show that the resulting docking line can be used for secondary integration. To demonstrate its utility, we study the activity of a germ-line-specific promoter when located on the Y chromosome. We also show that Y-linked fluorescent transgenes allow automated sex separation of this important vector species, providing the means to generate large single-sex populations. Our findings will aid studies of sex chromosome function and enable the development of male-exclusive genetic traits for vector control.
2007
Wang-Sattler Rui, Blandin Stephanie A, Ning Ye, Blass Claudia, Dolo Guimogo, Touré Yeya T, delle Torre Alessandra, Lanzaro Gregory C, Steinmetz Lars M, Kafatos Fotis C, Zheng Liangbiao
Mosaic genome architecture of the Anopheles gambiae species complex Article de journal
Dans: PLoS ONE, vol. 2, no. 11, p. e1249, 2007, ISSN: 1932-6203.
Résumé | Liens | BibTeX | Étiquettes: Animals, Anopheles gambiae, Artificial, Bacterial, Biological Evolution, blandin, Chromosomes, Female, Genetic Markers, Genetic Variation, Genome, M3i, Microsatellite Repeats, Mosaicism
@article{wang-sattler_mosaic_2007,
title = {Mosaic genome architecture of the Anopheles gambiae species complex},
author = {Rui Wang-Sattler and Stephanie A Blandin and Ye Ning and Claudia Blass and Guimogo Dolo and Yeya T Touré and Alessandra delle Torre and Gregory C Lanzaro and Lars M Steinmetz and Fotis C Kafatos and Liangbiao Zheng},
doi = {10.1371/journal.pone.0001249},
issn = {1932-6203},
year = {2007},
date = {2007-01-01},
journal = {PLoS ONE},
volume = {2},
number = {11},
pages = {e1249},
abstract = {BACKGROUND: Attempts over the last three decades to reconstruct the phylogenetic history of the Anopheles gambiae species complex have been important for developing better strategies to control malaria transmission. METHODOLOGY: We used fingerprint genotyping data from 414 field-collected female mosquitoes at 42 microsatellite loci to infer the evolutionary relationships of four species in the A. gambiae complex, the two major malaria vectors A. gambiae sensu stricto (A. gambiae s.s.) and A. arabiensis, as well as two minor vectors, A. merus and A. melas. PRINCIPAL FINDINGS: We identify six taxonomic units, including a clear separation of West and East Africa A. gambiae s.s. S molecular forms. We show that the phylogenetic relationships vary widely between different genomic regions, thus demonstrating the mosaic nature of the genome of these species. The two major malaria vectors are closely related and closer to A. merus than to A. melas at the genome-wide level, which is also true if only autosomes are considered. However, within the Xag inversion region of the X chromosome, the M and two S molecular forms are most similar to A. merus. Near the X centromere, outside the Xag region, the two S forms are highly dissimilar to the other taxa. Furthermore, our data suggest that the centromeric region of chromosome 3 is a strong discriminator between the major and minor malaria vectors. CONCLUSIONS: Although further studies are needed to elucidate the basis of the phylogenetic variation among the different regions of the genome, the preponderance of sympatric admixtures among taxa strongly favor introgression of different genomic regions between species, rather than lineage sorting of ancestral polymorphism, as a possible mechanism.},
keywords = {Animals, Anopheles gambiae, Artificial, Bacterial, Biological Evolution, blandin, Chromosomes, Female, Genetic Markers, Genetic Variation, Genome, M3i, Microsatellite Repeats, Mosaicism},
pubstate = {published},
tppubtype = {article}
}
BACKGROUND: Attempts over the last three decades to reconstruct the phylogenetic history of the Anopheles gambiae species complex have been important for developing better strategies to control malaria transmission. METHODOLOGY: We used fingerprint genotyping data from 414 field-collected female mosquitoes at 42 microsatellite loci to infer the evolutionary relationships of four species in the A. gambiae complex, the two major malaria vectors A. gambiae sensu stricto (A. gambiae s.s.) and A. arabiensis, as well as two minor vectors, A. merus and A. melas. PRINCIPAL FINDINGS: We identify six taxonomic units, including a clear separation of West and East Africa A. gambiae s.s. S molecular forms. We show that the phylogenetic relationships vary widely between different genomic regions, thus demonstrating the mosaic nature of the genome of these species. The two major malaria vectors are closely related and closer to A. merus than to A. melas at the genome-wide level, which is also true if only autosomes are considered. However, within the Xag inversion region of the X chromosome, the M and two S molecular forms are most similar to A. merus. Near the X centromere, outside the Xag region, the two S forms are highly dissimilar to the other taxa. Furthermore, our data suggest that the centromeric region of chromosome 3 is a strong discriminator between the major and minor malaria vectors. CONCLUSIONS: Although further studies are needed to elucidate the basis of the phylogenetic variation among the different regions of the genome, the preponderance of sympatric admixtures among taxa strongly favor introgression of different genomic regions between species, rather than lineage sorting of ancestral polymorphism, as a possible mechanism.
2006
Frolet Cécile, Thoma Martine, Blandin Stéphanie A, Hoffmann Jules A, Levashina Elena A
Boosting NF-kappaB-dependent basal immunity of Anopheles gambiae aborts development of Plasmodium berghei Article de journal
Dans: Immunity, vol. 25, no. 4, p. 677–685, 2006, ISSN: 1074-7613.
Résumé | Liens | BibTeX | Étiquettes: Animals, Anopheles gambiae, blandin, Gene Expression, Gene Expression Regulation, Genes, hoffmann, Immunity, Insect, M3i, NF-kappa B, Plasmodium berghei, telomerase
@article{frolet_boosting_2006,
title = {Boosting NF-kappaB-dependent basal immunity of Anopheles gambiae aborts development of Plasmodium berghei},
author = {Cécile Frolet and Martine Thoma and Stéphanie A Blandin and Jules A Hoffmann and Elena A Levashina},
url = {http://www.ncbi.nlm.nih.gov/pubmed/17045818},
doi = {10.1016/j.immuni.2006.08.019},
issn = {1074-7613},
year = {2006},
date = {2006-10-01},
journal = {Immunity},
volume = {25},
number = {4},
pages = {677--685},
abstract = {Anopheles gambiae, the major vector for the protozoan malaria parasite Plasmodium falciparum, mounts powerful antiparasitic responses that cause marked parasite loss during midgut invasion. Here, we showed that these antiparasitic defenses were composed of pre- and postinvasion phases and that the preinvasion phase was predominantly regulated by Rel1 and Rel2 members of the NF-kappaB transcription factors. Concurrent silencing of Rel1 and Rel2 decreased the basal expression of the major antiparasitic genes TEP1 and LRIM1 and abolished resistance of Anopheles to the rodent malaria parasite P. berghei. Conversely, depletion of a negative regulator of Rel1, Cactus, prior to infection, enhanced the basal expression of TEP1 and of other immune factors and completely prevented parasite development. Our findings uncover the crucial role of the preinvasion defense in the elimination of parasites, which is at least in part based on circulating blood molecules.},
keywords = {Animals, Anopheles gambiae, blandin, Gene Expression, Gene Expression Regulation, Genes, hoffmann, Immunity, Insect, M3i, NF-kappa B, Plasmodium berghei, telomerase},
pubstate = {published},
tppubtype = {article}
}
Anopheles gambiae, the major vector for the protozoan malaria parasite Plasmodium falciparum, mounts powerful antiparasitic responses that cause marked parasite loss during midgut invasion. Here, we showed that these antiparasitic defenses were composed of pre- and postinvasion phases and that the preinvasion phase was predominantly regulated by Rel1 and Rel2 members of the NF-kappaB transcription factors. Concurrent silencing of Rel1 and Rel2 decreased the basal expression of the major antiparasitic genes TEP1 and LRIM1 and abolished resistance of Anopheles to the rodent malaria parasite P. berghei. Conversely, depletion of a negative regulator of Rel1, Cactus, prior to infection, enhanced the basal expression of TEP1 and of other immune factors and completely prevented parasite development. Our findings uncover the crucial role of the preinvasion defense in the elimination of parasites, which is at least in part based on circulating blood molecules.