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Abstract
The principles and function of chromatin and nuclear architecture have been extensively studied in model organisms, such as Drosophila melanogaster. However, little is known about the role of these epigenetic processes in transcriptional regulation in other insects including mosquitoes, which are major disease vectors and a worldwide threat for human health. Some of these life-threatening diseases are malaria, which is caused by protozoan parasites of the genus Plasmodium and transmitted by Anopheles mosquitoes; dengue fever, which is caused by an arbovirus mainly transmitted by Aedes aegypti; and West Nile fever, which is caused by an arbovirus transmitted by Culex spp. In this contribution, we review what is known about chromatin-associated mechanisms and the 3D genome structure in various mosquito vectors, including Anopheles, Aedes, and Culex spp. We also discuss the similarities between epigenetic mechanisms in mosquitoes and the model organism Drosophila melanogaster, and advocate that the field could benefit from the cross-application of state-of-the-art functional genomic technologies that are well-developed in the fruit fly. Uncovering the mosquito regulatory genome can lead to the discovery of unique regulatory networks associated with the parasitic life-style of these insects. It is also critical to understand the molecular interactions between the vectors and the pathogens that they transmit, which could hold the key to major breakthroughs on the fight against mosquito-borne diseases. Finally, it is clear that epigenetic mechanisms controlling mosquito environmental plasticity and evolvability are also of utmost importance, particularly in the current context of globalization and climate change.
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Affiliation(s)
| | | | - José L. Ruiz
- Instituto de Parasitología y Biomedicina López-Neyra (IPBLN), Consejo Superior de Investigaciones Científicas, Granada, Spain
| | - Elena Gómez-Díaz
- Instituto de Parasitología y Biomedicina López-Neyra (IPBLN), Consejo Superior de Investigaciones Científicas, Granada, Spain
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Drosopoulou E, Gariou-Papalexiou A, Karamoustou E, Gouvi G, Augustinos AA, Bourtzis K, Zacharopoulou A. The chromosomes of Drosophila suzukii (Diptera: Drosophilidae): detailed photographic polytene chromosomal maps and in situ hybridization data. Mol Genet Genomics 2019; 294:1535-46. [PMID: 31346719 DOI: 10.1007/s00438-019-01595-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 07/15/2019] [Indexed: 01/25/2023]
Abstract
The spotted wing drosophila, D. suzukii, is a serious agricultural pest attacking a variety of soft fruits and vegetables. Although originating from East Asia it has recently invaded America and Europe raising major concern about its expansion potential and the consequent economic losses. Since cytogenetic information on the species is scarce, we report here the mitotic karyotype and detailed photographic maps of the salivary gland polytene chromosomes of D. suzukii. The mitotic metaphase complement contains three pairs of autosomes, one of which is dot-like, and one pair of heteromorphic (XX/XY) sex chromosomes. The salivary gland polytene complement consists of five long polytene arms, representing the two metacentric autosomes and the acrocentric X chromosome, and one very short polytene element, which corresponds to the dot-like autosome. Banding pattern as well as the most characteristic features and prominent landmarks of each polytene chromosome arm are presented and discussed. Furthermore, twelve gene markers have been mapped on the polytene chromosomes of D. suzukii by in situ hybridization. Their distribution pattern was found quite similar to that of D. melanogaster revealing conservation of synteny although the relative position within each chromosome arm for most of the genes differed significantly between D. suzukii and D. melanogaster. The chromosome information presented here is suitable for comparative cytogenetic studies and phylogenetic exploration, while it could also facilitate the assembly of the genome sequence and support the development of genetic tools for species-specific and environment-friendly biological control applications such as the sterile insect technique.
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Anselmetti Y, Duchemin W, Tannier E, Chauve C, Bérard S. Phylogenetic signal from rearrangements in 18 Anopheles species by joint scaffolding extant and ancestral genomes. BMC Genomics 2018; 19:96. [PMID: 29764366 PMCID: PMC5954271 DOI: 10.1186/s12864-018-4466-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [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] [Indexed: 12/02/2022] Open
Abstract
Background Genomes rearrangements carry valuable information for phylogenetic inference or the elucidation of molecular mechanisms of adaptation. However, the detection of genome rearrangements is often hampered by current deficiencies in data and methods: Genomes obtained from short sequence reads have generally very fragmented assemblies, and comparing multiple gene orders generally leads to computationally intractable algorithmic questions. Results We present a computational method, ADseq, which, by combining ancestral gene order reconstruction, comparative scaffolding and de novo scaffolding methods, overcomes these two caveats. ADseq provides simultaneously improved assemblies and ancestral genomes, with statistical supports on all local features. Compared to previous comparative methods, it runs in polynomial time, it samples solutions in a probabilistic space, and it can handle a significantly larger gene complement from the considered extant genomes, with complex histories including gene duplications and losses. We use ADseq to provide improved assemblies and a genome history made of duplications, losses, gene translocations, rearrangements, of 18 complete Anopheles genomes, including several important malaria vectors. We also provide additional support for a differentiated mode of evolution of the sex chromosome and of the autosomes in these mosquito genomes. Conclusions We demonstrate the method’s ability to improve extant assemblies accurately through a procedure simulating realistic assembly fragmentation. We study a debated issue regarding the phylogeny of the Gambiae complex group of Anopheles genomes in the light of the evolution of chromosomal rearrangements, suggesting that the phylogenetic signal they carry can differ from the phylogenetic signal carried by gene sequences, more prone to introgression. Electronic supplementary material The online version of this article (10.1186/s12864-018-4466-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yoann Anselmetti
- ISEM, Université de Montpellier, CNRS, IRD, EPHE, Montpellier, France.,Univ Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive UMR5558, 43 Boulevard du 11 novembre 1918, Villeurbanne cedex, 69622, France
| | - Wandrille Duchemin
- Univ Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive UMR5558, 43 Boulevard du 11 novembre 1918, Villeurbanne cedex, 69622, France.,INRIA Grenoble - Rhône-Alpes, 655 Avenue de l'Europe, Montbonnot-Saint-Martin, 38330, France
| | - Eric Tannier
- Univ Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive UMR5558, 43 Boulevard du 11 novembre 1918, Villeurbanne cedex, 69622, France.,INRIA Grenoble - Rhône-Alpes, 655 Avenue de l'Europe, Montbonnot-Saint-Martin, 38330, France
| | - Cedric Chauve
- Department of Mathematics, Simon Fraser University, 8888 University Drive, Burnaby, V5A1S6, BC, Canada
| | - Sèverine Bérard
- ISEM, Université de Montpellier, CNRS, IRD, EPHE, Montpellier, France.
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Wei Y, Cheng B, Zhu G, Shen D, Liang J, Wang C, Wang J, Tang J, Cao J, Sharakhov IV, Xia A. Comparative physical genome mapping of malaria vectors Anopheles sinensis and Anopheles gambiae. Malar J 2017; 16:235. [PMID: 28583133 PMCID: PMC5460330 DOI: 10.1186/s12936-017-1888-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 02/08/2017] [Accepted: 05/31/2017] [Indexed: 11/29/2022] Open
Abstract
Background Anopheles sinensis is a dominant natural vector of Plasmodium vivax in China, Taiwan, Japan, and Korea. Recent genome sequencing of An. sinensis provides important insights into the genomic basis of vectorial capacity. However, the lack of a physical genome map with chromosome assignment and orientation of sequencing scaffolds hinders comparative analyses with other genomes to infer evolutionary changes relevant to the vector capacity. Results Here, a physical genome map for An. sinensis was constructed by assigning 52 scaffolds onto the chromosomes using fluorescence in situ hybridization (FISH). This chromosome-based genome assembly composes approximately 36% of the total An. sinensis genome. Comparisons of 3955 orthologous genes between An. sinensis and Anopheles gambiae identified 361 conserved synteny blocks and 267 inversions fixed between these two lineages. The rate of gene order reshuffling on the X chromosome is approximately 3.2 times higher than that on the autosomes. Conclusions The physical map will facilitate detailed genomic analysis of An. sinensis and contribute to understanding of the patterns and mechanisms of large-scale genome rearrangements in anopheline mosquitoes. Electronic supplementary material The online version of this article (doi:10.1186/s12936-017-1888-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yun Wei
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Biao Cheng
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Guoding Zhu
- Key Laboratory of National Health and Family Planning Commission on Parasitic Disease Control and Prevention, Jiangsu Provincial Key Laboratory on Parasite and Vector Control Technology, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu Province, China
| | - Danyu Shen
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Jiangtao Liang
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Cong Wang
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Jing Wang
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Jianxia Tang
- Key Laboratory of National Health and Family Planning Commission on Parasitic Disease Control and Prevention, Jiangsu Provincial Key Laboratory on Parasite and Vector Control Technology, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu Province, China
| | - Jun Cao
- Key Laboratory of National Health and Family Planning Commission on Parasitic Disease Control and Prevention, Jiangsu Provincial Key Laboratory on Parasite and Vector Control Technology, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu Province, China
| | - Igor V Sharakhov
- Department of Entomology, Fralin Life Science Institute, Virginia Tech, Blacksburg, VA, USA.,Laboratory for Ecology, Genetics and Environmental Protection, Tomsk State University, Tomsk, Russia
| | - Ai Xia
- Department of Entomology, Nanjing Agricultural University, Nanjing, China.
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Liang J, Cheng B, Zhu G, Wei Y, Tang J, Cao J, Ma Y, Sharakhova MV, Xia A, Sharakhov IV. Structural divergence of chromosomes between malaria vectors Anopheles lesteri and Anopheles sinensis. Parasit Vectors 2016; 9:608. [PMID: 27887641 PMCID: PMC5124334 DOI: 10.1186/s13071-016-1855-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [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: 08/15/2016] [Accepted: 10/23/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Anopheles lesteri and Anopheles sinensis are two major malaria vectors in China and Southeast Asia. They are dramatically different in terms of geographical distribution, host preference, resting habitats, and other traits associated with ecological adaptation and malaria transmission. Both species belong to the Anopheles hyrcanus group, but the extent of genetic differences between them is not well understood. To provide an effective way to differentiate between species and to find useful markers for population genetics studies, we performed a comparative cytogenetic analysis of these two malaria vectors. RESULTS Presented here is a standard cytogenetic map for An. lesteri, and a comparative analysis of chromosome structure and gene order between An. lesteri and An. sinensis. Our results demonstrate that much of the gene order on chromosomes X and 2 was reshuffled between the two species. However, the banding pattern and the gene order on chromosome 3 appeared to be conserved. We also found two new polymorphic inversions, 2Lc and 3Rb, in An. lesteri, and we mapped the breakpoints of these two inversions on polytene chromosomes. CONCLUSIONS Our results demonstrate the extent of structural divergence of chromosomes between An. lesteri and An. sinensis, and provide a new taxonomic cytogenetic tool to distinguish between these two species. Polymorphic inversions of An. lesteri could serve as markers for studies of the population structure and ecological adaptations of this major malaria vector.
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Affiliation(s)
- Jiangtao Liang
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Biao Cheng
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Guoding Zhu
- Key Laboratory of National Health and Family Planning Commission on Parasitic Disease Control and Prevention, Jiangsu Provincial Key Laboratory on Parasite and Vector Control Technology, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu Province, China
| | - Yun Wei
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Jianxia Tang
- Key Laboratory of National Health and Family Planning Commission on Parasitic Disease Control and Prevention, Jiangsu Provincial Key Laboratory on Parasite and Vector Control Technology, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu Province, China
| | - Jun Cao
- Key Laboratory of National Health and Family Planning Commission on Parasitic Disease Control and Prevention, Jiangsu Provincial Key Laboratory on Parasite and Vector Control Technology, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu Province, China
| | - Yajun Ma
- Department of Tropical Infectious Diseases, Faculty of Tropical Medicine and Public Health, Second Military Medical University, Shanghai, 200433, China
| | - Maria V Sharakhova
- Department of Entomology, Fralin Life Science Institute, Virginia Tech, Blacksburg, VA, USA.,Laboratory for Ecology, Genetics and Environmental Protection, Tomsk State University, Tomsk, Russia
| | - Ai Xia
- Department of Entomology, Nanjing Agricultural University, Nanjing, China.
| | - Igor V Sharakhov
- Department of Entomology, Fralin Life Science Institute, Virginia Tech, Blacksburg, VA, USA. .,Laboratory for Ecology, Genetics and Environmental Protection, Tomsk State University, Tomsk, Russia.
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Adler PH, Yildirim A, Onder Z, Tasci GT, Duzlu O, Arslan MO, Ciloglu A, Sari B, Parmaksizoglu N, Inci A. Rearrangement hotspots in the sex chromosome of the Palearctic black fly Simulium bergi (Diptera, Simuliidae). Comp Cytogenet 2016; 10:295-310. [PMID: 27551350 PMCID: PMC4977804 DOI: 10.3897/compcytogen.v10i2.8855] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 06/01/2016] [Indexed: 06/06/2023]
Abstract
An extreme example of nonrandom rearrangements, especially inversion breaks, is described in the polytene chromosomes of the black fly Simulium bergi Rubtsov, 1956 from Armenia and Turkey. A total of 48 rearrangements was discovered, relative to the standard banding sequence for the subgenus Simulium Latreille, 1802. One rearrangement, an inversion (IIS-C) in the short arm of the second chromosome, was fixed. Six (12.5%) of the rearrangements were autosomal polymorphisms, and the remaining 41 (85.4%) were sex linked. More than 40 X- and Y-linked rearrangements, predominantly inversions, were clustered in the long arm of the second chromosome (IIL), representing about 15% of the total complement. The pattern conforms to a nonrandom model of chromosome breakage, perhaps associated with an underlying molecular mechanism.
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Affiliation(s)
- Peter H. Adler
- Department of Agricultural and Environmental Sciences, 130 McGinty Court, Clemson University, Clemson, SC 29634-0310 USA
| | - Alparslan Yildirim
- Department of Parasitology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey
| | - Zuhal Onder
- Department of Parasitology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey
| | - G. Taskin Tasci
- Department of Parasitology, Faculty of Veterinary Medicine, Kafkas University, Kars, Turkey
| | - Onder Duzlu
- Department of Parasitology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey
| | - M. Ozkan Arslan
- Department of Microbiology, Faculty of Medicine, Kafkas University, Kars, Turkey
| | - Arif Ciloglu
- Department of Parasitology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey
| | - Baris Sari
- Department of Parasitology, Faculty of Veterinary Medicine, Kafkas University, Kars, Turkey
| | - Nilgun Parmaksizoglu
- Department of Parasitology, Faculty of Veterinary Medicine, Kafkas University, Kars, Turkey
| | - Abdullah Inci
- Department of Parasitology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey
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Gelfand M. Introduction to selected papers from MCCMB 2015. J Bioinform Comput Biol 2016. [DOI: 10.1142/s0219720016020030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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