101
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Zhou MB, Hu H, Miskey C, Lazarow K, Ivics Z, Kunze R, Yang G, Izsvák Z, Tang DQ. Transposition of the bamboo Mariner-like element Ppmar1 in yeast. Mol Phylogenet Evol 2017; 109:367-374. [PMID: 28189615 DOI: 10.1016/j.ympev.2017.02.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 01/26/2017] [Accepted: 02/03/2017] [Indexed: 12/30/2022]
Abstract
The moso bamboo genome contains the two structurally intact and thus potentially functional mariner-like elements Ppmar1 and Ppmar2. Both elements contain perfect terminal inverted repeats (TIRs) and a full-length intact transposase gene. Here we investigated whether Ppmar1 is functional in yeast (Saccharomyces cerevisiae). We have designed a two-component system consisting of a transposase expression cassette and a non-autonomous transposon on two separate plasmids. We demonstrate that the Ppmar1 transposase Pptpase1 catalyses excision of the non-autonomous Ppmar1NA element from the plasmid and reintegration at TA dinucleotide sequences in the yeast chromosomes. In addition, we generated 14 hyperactive Ppmar1 transposase variants by systematic single amino acid substitutions. The most active transposase variant, S171A, induces 10-fold more frequent Ppmar1NA excisions in yeast than the wild type transposase. The Ppmar1 transposon is a promising tool for insertion mutagenesis in moso bamboo and may be used in other plants as an alternative to the established transposon tagging systems.
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Affiliation(s)
- Ming-Bing Zhou
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, LinAn, China
| | - Hui Hu
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, LinAn, China
| | - Csaba Miskey
- Paul Ehrlich Institute, Paul Ehrlich Str. 51-59, 63225 Langen, Germany
| | - Katina Lazarow
- Institute of Biology, Dahlem Centre of Plant Sciences, Freie Universität Berlin, 14195 Berlin, Germany
| | - Zoltán Ivics
- Paul Ehrlich Institute, Paul Ehrlich Str. 51-59, 63225 Langen, Germany
| | - Reinhard Kunze
- Institute of Biology, Dahlem Centre of Plant Sciences, Freie Universität Berlin, 14195 Berlin, Germany
| | - Guojun Yang
- Department of Biology, University of Toronto, Mississauga, ON, Canada
| | - Zsuzsanna Izsvák
- Max Delbrück Center for Molecular Medicine in the Helmholtz Society, Berlin, Germany.
| | - Ding-Qin Tang
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, LinAn, China.
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102
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Braga RM, Santana MF, Costa RVD, Brommonschenkel SH, de Araújo EF, de Queiroz MV. Transposable elements belonging to the Tc1-Mariner superfamily are heavily mutated in Colletotrichum graminicola. Mycologia 2017; 106:629-41. [DOI: 10.3852/13-262] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Raíssa Mesquita Braga
- Departamento de Microbiologia, Instituto de Ciências Biomédicas II, Universidade de São Paulo, Avenida Professor Lineu Prestes 1374, Cidade Universitária, São Paulo, Brasil. CEP: 05508-900
| | - Mateus Ferreira Santana
- Departamento de Microbiologia, Universidade Federal de Viçosa, Avenida Peter Henry Rolfs s/n, Campus Universitário, Viçosa, Brasil. CEP: 36570-000
| | - Rodrigo Veras da Costa
- Embrapa Milho e Sorgo, Rod MG 424 Km 65, Sete Lagoas, Minas Gerais, Brasil. CEP: 35701-970
| | - Sergio Herminio Brommonschenkel
- Departamento de Fitopatologia, Universidade Federal de Viçosa, Avenida Peter Henry Rolfs s/n, Campus Universitário, Viçosa, Brasil. CEP: 36570-000
| | - Elza Fernandes de Araújo
- Fundação de Amparo à Pesquisa do Estado de Minas Gerais, Rua Raul Pompeia 101, São Pedro, Belo Horizonte, Brasil. CEP: 30330-080
| | - Marisa Vieira de Queiroz
- Departamento de Microbiologia, Universidade Federal de Viçosa, Avenida Peter Henry Rolfs s/n, Campus Universitário, Viçosa, Brasil. CEP: 36570-000
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103
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Liu K, Wessler SR. Functional characterization of the active Mutator-like transposable element, Muta1 from the mosquito Aedes aegypti. Mob DNA 2017; 8:1. [PMID: 28096902 PMCID: PMC5225508 DOI: 10.1186/s13100-016-0084-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Accepted: 12/19/2016] [Indexed: 04/25/2024] Open
Abstract
BACKGROUND Mutator-like transposable elements (MULEs) are widespread with members in fungi, plants, and animals. Most of the research on the MULE superfamily has focused on plant MULEs where they were discovered and where some are extremely active and have significant impact on genome structure. The maize MuDR element has been widely used as a tool for both forward and reverse genetic studies because of its high transposition rate and preference for targeting genic regions. However, despite being widespread, only a few active MULEs have been identified, and only one, the rice Os3378, has demonstrated activity in a non-host organism. RESULTS Here we report the identification of potentially active MULEs in the mosquito Aedes aegypti. We demonstrate that one of these, Muta1, is capable of excision and reinsertion in a yeast transposition assay. Element reinsertion generated either 8 bp or 9 bp target site duplications (TSDs) with no apparent sequence preference. Mutagenesis analysis of donor site TSDs in the yeast assay indicates that their presence is important for precise excision and enhanced transposition. Site directed mutagenesis of the putative DDE catalytic motif and other conserved residues in the transposase protein abolished transposition activity. CONCLUSIONS Collectively, our data indicates that the Muta1 transposase of Ae. aegypti can efficiently catalyze both excision and reinsertion reactions in yeast. Mutagenesis analysis reveals that several conserved amino acids, including the DDE triad, play important roles in transposase function. In addition, donor site TSD also impacts the transposition of Muta1.
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Affiliation(s)
- Kun Liu
- Graduate Program in Botany and Plant Sciences, University of California, Riverside, CA 92521 USA
| | - Susan R Wessler
- Department of Botany and Plant Sciences, University of California, Riverside, CA 92521 USA
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104
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Han MJ, Zhou QZ, Zhang HH, Tong X, Lu C, Zhang Z, Dai F. iMITEdb: the genome-wide landscape of miniature inverted-repeat transposable elements in insects. DATABASE-THE JOURNAL OF BIOLOGICAL DATABASES AND CURATION 2016; 2016:baw148. [PMID: 28025339 PMCID: PMC5199201 DOI: 10.1093/database/baw148] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2016] [Revised: 09/19/2016] [Accepted: 10/18/2016] [Indexed: 01/23/2023]
Abstract
Miniature inverted-repeat transposable elements (MITEs) have attracted much attention due to their widespread occurrence and high copy numbers in eukaryotic genomes. However, the systematic knowledge about MITEs in insects and other animals is still lacking. In this study, we identified 6012 MITE families from 98 insect species genomes. Comparison of these MITEs with known MITEs in the NCBI non-redundant database and Repbase showed that 5701(∼95%) of 6012 MITE families are novel. The abundance of MITEs varies drastically among different insect species, and significantly correlates with genome size. In general, larger genomes contain more MITEs than small genomes. Furthermore, all identified MITEs were included in a newly constructed database (iMITEdb) (http://gene.cqu.edu.cn/iMITEdb/), which has functions such as browse, search, BLAST and download. Overall, our results not only provide insight on insect MITEs but will also improve assembly and annotation of insect genomes. More importantly, the results presented in this study will promote studies of MITEs function, evolution and application in insects. Database URL: http://gene.cqu.edu.cn/iMITEdb/
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Affiliation(s)
- Min-Jin Han
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Functional Genomics and Biotechnology of Agricultural Ministry, Southwest University, Chongqing 400715, China
| | - Qiu-Zhong Zhou
- Laboratory of Evolutionary and Functional Genomics, School of Life Sciences, Chongqing University, Chongqing 401331, China
| | - Hua-Hao Zhang
- College of Pharmacy and Life Science, Jiujiang University, Jiujiang 332000, China
| | - Xiaoling Tong
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Functional Genomics and Biotechnology of Agricultural Ministry, Southwest University, Chongqing 400715, China
| | - Cheng Lu
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Functional Genomics and Biotechnology of Agricultural Ministry, Southwest University, Chongqing 400715, China
| | - Ze Zhang
- Laboratory of Evolutionary and Functional Genomics, School of Life Sciences, Chongqing University, Chongqing 401331, China
| | - Fangyin Dai
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Functional Genomics and Biotechnology of Agricultural Ministry, Southwest University, Chongqing 400715, China
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105
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Duan CG, Wang X, Xie S, Pan L, Miki D, Tang K, Hsu CC, Lei M, Zhong Y, Hou YJ, Wang Z, Zhang Z, Mangrauthia SK, Xu H, Zhang H, Dilkes B, Tao WA, Zhu JK. A pair of transposon-derived proteins function in a histone acetyltransferase complex for active DNA demethylation. Cell Res 2016; 27:226-240. [PMID: 27934869 PMCID: PMC5339849 DOI: 10.1038/cr.2016.147] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2016] [Revised: 10/17/2016] [Accepted: 10/18/2016] [Indexed: 12/23/2022] Open
Abstract
Transposons are generally kept silent by epigenetic mechanisms including DNA methylation. Here, we identified a pair of Harbinger transposon-derived proteins (HDPs), HDP1 and HDP2, as anti-silencing factors in Arabidopsis. hdp1 and hdp2 mutants displayed an enhanced silencing of transgenes and some transposons. Phylogenetic analyses revealed that HDP1 and HDP2 were co-domesticated from the Harbinger transposon-encoded transposase and DNA-binding protein, respectively. HDP1 interacts with HDP2 in the nucleus, analogous to their transposon counterparts. Moreover, HDP1 and HDP2 are associated with IDM1, IDM2, IDM3 and MBD7 that constitute a histone acetyltransferase complex functioning in DNA demethylation. HDP2 and the methyl-DNA-binding protein MBD7 share a large set of common genomic binding sites, indicating that they jointly determine the target specificity of the histone acetyltransferase complex. Thus, our data revealed that HDP1 and HDP2 constitute a functional module that has been recruited to a histone acetyltransferase complex to prevent DNA hypermethylation and epigenetic silencing.
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Affiliation(s)
- Cheng-Guo Duan
- Shanghai Center for Plant Stress Biology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, China.,Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907, USA
| | - Xingang Wang
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907, USA
| | - Shaojun Xie
- Shanghai Center for Plant Stress Biology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, China
| | - Li Pan
- Department of Biochemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Daisuke Miki
- Shanghai Center for Plant Stress Biology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, China
| | - Kai Tang
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907, USA
| | - Chuan-Chih Hsu
- Department of Biochemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Mingguang Lei
- Shanghai Center for Plant Stress Biology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, China
| | - Yingli Zhong
- Shanghai Center for Plant Stress Biology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, China
| | - Yueh-Ju Hou
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907, USA
| | - Zhijuan Wang
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907, USA.,The State Key Laboratory of Plant Cell and Chromosome Engineering, Center for Agricultural Research Resources, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, Hebei 050022, China
| | - Zhengjing Zhang
- Shanghai Center for Plant Stress Biology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, China
| | - Satendra K Mangrauthia
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907, USA.,Biotechnology Section, Indian Institute of Rice Research (IIRR), Hyderabad, India
| | - Huawei Xu
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907, USA.,College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471026, China
| | - Heng Zhang
- Shanghai Center for Plant Stress Biology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, China
| | - Brian Dilkes
- Department of Biochemistry, Purdue University, West Lafayette, IN 47907, USA
| | - W Andy Tao
- Department of Biochemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Jian-Kang Zhu
- Shanghai Center for Plant Stress Biology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, China.,Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907, USA
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106
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Jiang SH, Li GY, Xiong XM. Novel miniature inverted-repeat transposable elements derived from novel CACTA transposons were discovered in the genome of the ant Camponotus floridanus. Genes Genomics 2016. [DOI: 10.1007/s13258-016-0464-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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107
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Shen XD, Hou F, Chen J, Jiang XY, Zou SM. Identification of nuclear localization signal within goldfish Tgf2 transposase. Gene 2016; 593:21-27. [PMID: 27468946 DOI: 10.1016/j.gene.2016.07.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 07/12/2016] [Accepted: 07/24/2016] [Indexed: 10/21/2022]
Abstract
The structure of goldfish (Carassius auratus) Tgf2 transposase is still poorly understood, although it can mediate efficient gene transfer in teleost fish. We hypothesized the existence of a nuclear localization signal (NLS) within Tgf2 transposase to assist transport into the nucleus. To explore this, 15 consecutive amino acid residues (656-670 aa) within the C-terminus of Tgf2 transposase were predicted in silico to be a NLS domain. The pEGFP-C1-Tgf2TP(△31C) plasmid encoding the NLS-domain-deleted Tgf2 transposase fused to EGFP was constructed, and transfected into 293T cells. After transfection with pEGFP-C1-Tgf2TP(△31C), EGFP was not detected in the nucleus alone, while 67.0% of cells expressed EGFP only in the cytoplasm. In contrast, after transfection with control plasmids containing C- or N-terminal truncated Tgf2 transposases with an intact NLS domain, EGFP was not detected in the cytoplasm alone, while approximately 40% of cells expressed EGFP only in the nucleus, and the remaining 60% expressed EGFP in both the nucleus and cytoplasm. Our results demonstrated that loss of the NLS domain results in expression in the cytoplasm but not in the nucleus. These findings suggest that 15 aa residues located from 656 to 670 aa within the C-terminus of Tgf2 transposase can function as a NLS to assist the transfer of the transposase into the nucleus where it mediates DNA transposition.
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Affiliation(s)
- Xiao-Dan Shen
- Key Laboratory of Genetic Resources for Freshwater Aquaculture and Fisheries, Shanghai Ocean University, 999 Huchenghuan Road, Shanghai 201306, China
| | - Fei Hou
- Key Laboratory of Genetic Resources for Freshwater Aquaculture and Fisheries, Shanghai Ocean University, 999 Huchenghuan Road, Shanghai 201306, China
| | - Jie Chen
- Key Laboratory of Genetic Resources for Freshwater Aquaculture and Fisheries, Shanghai Ocean University, 999 Huchenghuan Road, Shanghai 201306, China
| | - Xia-Yun Jiang
- Key Laboratory of Genetic Resources for Freshwater Aquaculture and Fisheries, Shanghai Ocean University, 999 Huchenghuan Road, Shanghai 201306, China.
| | - Shu-Ming Zou
- Key Laboratory of Genetic Resources for Freshwater Aquaculture and Fisheries, Shanghai Ocean University, 999 Huchenghuan Road, Shanghai 201306, China.
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108
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Abstract
DNA transposons are defined segments of DNA that are able to move from one genomic location to another. Movement is facilitated by one or more proteins, called the transposase, typically encoded by the mobile element itself. Here, we first provide an overview of the classification of such mobile elements in a variety of organisms. From a mechanistic perspective, we have focused on one particular group of DNA transposons that encode a transposase with a DD(E/D) catalytic domain that is topologically similar to RNase H. For these, a number of three-dimensional structures of transpososomes (transposase-nucleic acid complexes) are available, and we use these to describe the basics of their mechanisms. The DD(E/D) group, in addition to being the largest and most common among all DNA transposases, is the one whose members have been used for a wide variety of genomic applications. Therefore, a second focus of the article is to provide a nonexhaustive overview of transposon applications. Although several non-transposon-based approaches to site-directed genome modifications have emerged in the past decade, transposon-based applications are highly relevant when integration specificity is not sought. In fact, for many applications, the almost-perfect randomness and high frequency of integration make transposon-based approaches indispensable.
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Affiliation(s)
- Alison B. Hickman
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, United States
| | - Fred Dyda
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, United States
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109
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Characterization of irritans mariner-like elements in the olive fruit fly Bactrocera oleae (Diptera: Tephritidae): evolutionary implications. Naturwissenschaften 2016; 103:64. [DOI: 10.1007/s00114-016-1391-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 06/22/2016] [Accepted: 06/27/2016] [Indexed: 11/25/2022]
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110
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Jiang XY, Hou F, Shen XD, Du XD, Xu HL, Zou SM. The N-terminal zinc finger domain of Tgf2 transposase contributes to DNA binding and to transposition activity. Sci Rep 2016; 6:27101. [PMID: 27251101 PMCID: PMC4890040 DOI: 10.1038/srep27101] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 05/13/2016] [Indexed: 01/14/2023] Open
Abstract
Active Hobo/Activator/Tam3 (hAT) transposable elements are rarely found in vertebrates. Previously, goldfish Tgf2 was found to be an autonomously active vertebrate transposon that is efficient at gene-transfer in teleost fish. However, little is known about Tgf2 functional domains required for transposition. To explore this, we first predicted in silico a zinc finger domain in the N-terminus of full length Tgf2 transposase (L-Tgf2TPase). Two truncated recombinant Tgf2 transposases with deletions in the N-terminal zinc finger domain, S1- and S2-Tgf2TPase, were expressed in bacteria from goldfish cDNAs. Both truncated Tgf2TPases lost their DNA-binding ability in vitro, specifically at the ends of Tgf2 transposon than native L-Tgf2TPase. Consequently, S1- and S2-Tgf2TPases mediated gene transfer in the zebrafish genome in vivo at a significantly (p < 0.01) lower efficiency (21%–25%), in comparison with L-Tgf2TPase (56% efficiency). Compared to L-Tgf2TPase, truncated Tgf2TPases catalyzed imprecise excisions with partial deletion of TE ends and/or plasmid backbone insertion/deletion. The gene integration into the zebrafish genome mediated by truncated Tgf2TPases was imperfect, creating incomplete 8-bp target site duplications at the insertion sites. These results indicate that the zinc finger domain in Tgf2 transposase is involved in binding to Tgf2 terminal sequences, and loss of those domains has effects on TE transposition.
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Affiliation(s)
- Xia-Yun Jiang
- College of Food Science and Technology, Shanghai Ocean University, Huchenghuan Road 999, Shanghai 201306, China.,Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Huchenghuan Road 999, Shanghai 201306, China
| | - Fei Hou
- College of Food Science and Technology, Shanghai Ocean University, Huchenghuan Road 999, Shanghai 201306, China
| | - Xiao-Dan Shen
- Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Huchenghuan Road 999, Shanghai 201306, China
| | - Xue-Di Du
- College of animal science and technology, Yangzhou University, Wenhui Road 48, Yangzhou 225009, China
| | - Hai-Li Xu
- College of Food Science and Technology, Shanghai Ocean University, Huchenghuan Road 999, Shanghai 201306, China
| | - Shu-Ming Zou
- Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Huchenghuan Road 999, Shanghai 201306, China
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111
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Zhang HH, Shen YH, Xiong XM, Han MJ, Qi DW, Zhang XG. Evidence for horizontal transfer of a recently active Academ transposon. INSECT MOLECULAR BIOLOGY 2016; 25:338-346. [PMID: 26959720 DOI: 10.1111/imb.12225] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Horizontal transfer (HT), the exchange of genetic material between species, plays important roles in transposon biology and genome evolution. In this study, we provide the first documented example of a new Academ transposon involved in recent and distant HTs into the genomes of species belonging to seven different orders of insects: Lepidoptera, Hymenoptera, Neuroptera, Embioptera, Dermaptera, Trichoptera and Zoraptera. These results suggest that HT of DNA transposons amongst insects has occurred on a broader scale than previously appreciated. The Academ transposon discovered in the Lepidoptera and parasitic wasps is of particular interest because the intimate association between wasps and their lepidopteran hosts might provide an opportunity for HT of transposons.
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Affiliation(s)
- H-H Zhang
- College of Pharmacy and Life Science, Jiujiang University, Jiujiang, China
| | - Y-H Shen
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - X-M Xiong
- Clinical Medical College, Jiujiang University, Jiujiang, China
| | - M-J Han
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - D-W Qi
- Chongqing Bashu Secondary School, Chongqing, China
| | - X-G Zhang
- College of Pharmacy and Life Science, Jiujiang University, Jiujiang, China
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112
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Palazzo A, Lovero D, D’Addabbo P, Caizzi R, Marsano RM. Identification of Bari Transposons in 23 Sequenced Drosophila Genomes Reveals Novel Structural Variants, MITEs and Horizontal Transfer. PLoS One 2016; 11:e0156014. [PMID: 27213270 PMCID: PMC4877112 DOI: 10.1371/journal.pone.0156014] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 05/09/2016] [Indexed: 11/18/2022] Open
Abstract
Bari elements are members of the Tc1-mariner superfamily of DNA transposons, originally discovered in Drosophila melanogaster, and subsequently identified in silico in 11 sequenced Drosophila genomes and as experimentally isolated in four non-sequenced Drosophila species. Bari-like elements have been also studied for their mobility both in vivo and in vitro. We analyzed 23 Drosophila genomes and carried out a detailed characterization of the Bari elements identified, including those from the heterochromatic Bari1 cluster in D. melanogaster. We have annotated 401 copies of Bari elements classified either as putatively autonomous or inactive according to the structure of the terminal sequences and the presence of a complete transposase-coding region. Analyses of the integration sites revealed that Bari transposase prefers AT-rich sequences in which the TA target is cleaved and duplicated. Furthermore evaluation of transposon’s co-occurrence near the integration sites of Bari elements showed a non-random distribution of other transposable elements. We also unveil the existence of a putatively autonomous Bari1 variant characterized by two identical long Terminal Inverted Repeats, in D. rhopaloa. In addition, we detected MITEs related to Bari transposons in 9 species. Phylogenetic analyses based on transposase gene and the terminal sequences confirmed that Bari-like elements are distributed into three subfamilies. A few inconsistencies in Bari phylogenetic tree with respect to the Drosophila species tree could be explained by the occurrence of horizontal transfer events as also suggested by the results of dS analyses. This study further clarifies the Bari transposon’s evolutionary dynamics and increases our understanding on the Tc1-mariner elements’ biology.
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Affiliation(s)
- Antonio Palazzo
- Dipartimento di Biologia, Università degli Studi di Bari “Aldo Moro” via Orabona 4 70125, Bari, Italy
| | - Domenica Lovero
- Istituto di Biomembrane e Bioenergetica, Consiglio Nazionale delle Ricerche, Via Amendola 165/A, 70126, Bari, Italy
| | - Pietro D’Addabbo
- Dipartimento di Biologia, Università degli Studi di Bari “Aldo Moro” via Orabona 4 70125, Bari, Italy
| | - Ruggiero Caizzi
- Dipartimento di Biologia, Università degli Studi di Bari “Aldo Moro” via Orabona 4 70125, Bari, Italy
| | - René Massimiliano Marsano
- Dipartimento di Biologia, Università degli Studi di Bari “Aldo Moro” via Orabona 4 70125, Bari, Italy
- * E-mail:
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113
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Abstract
IS911 has provided a powerful model for studying the transposition of members of a large class of transposable element: the IS3 family of bacterial Insertion Sequences (IS). These transpose by a Copy-out-Paste-in mechanism in which a double-strand IS circle transposition intermediate is generated from the donor site by replication and proceeds to integrate into a suitable double strand DNA target. This is perhaps one of the most common transposition mechanisms known to date. Copy-out-Paste-in transposition has been adopted by members of at least eight large IS families. This chapter details the different steps of the Copy-out-Paste-in mechanism involved in IS911 transposition. At a more biological level it also describes various aspects of regulation of the transposition process. These include transposase production by programmed translational frameshifting, transposase expression from the circular intermediate using a specialized promoter assembled at the circle junction and binding of the nascent transposase while it remains attached to the ribosome during translation (co-translational binding). This co-translational binding of the transposase to neighboring IS ends provides an explanation for the longstanding observation that transposases show a cis-preference for their activities.
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114
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Abstract
hAT transposons are ancient in their origin and they are widespread across eukaryote kingdoms. They can be present in large numbers in many genomes. However, only a few active forms of these elements have so far been discovered indicating that, like all transposable elements, there is selective pressure to inactivate them. Nonetheless, there have been sufficient numbers of active hAT elements and their transposases characterized that permit an analysis of their structure and function. This review analyzes these and provides a comparison with the several domesticated hAT genes discovered in eukaryote genomes. Active hAT transposons have also been developed as genetic tools and understanding how these may be optimally utilized in new hosts will depend, in part, on understanding the basis of their function in genomes.
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115
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Abstract
The mold Aspergillus fumigatus causes invasive infection in immunocompromised patients. Recently, galactosaminogalactan (GAG), an exopolysaccharide composed of galactose and N-acetylgalactosamine (GalNAc), was identified as a virulence factor required for biofilm formation. The molecular mechanisms underlying GAG biosynthesis and GAG-mediated biofilm formation were unknown. We identified a cluster of five coregulated genes that were dysregulated in GAG-deficient mutants and whose gene products share functional similarity with proteins that mediate the synthesis of the bacterial biofilm exopolysaccharide poly-(β1-6)-N-acetyl-d-glucosamine (PNAG). Bioinformatic analyses suggested that the GAG cluster gene agd3 encodes a protein containing a deacetylase domain. Because deacetylation of N-acetylglucosamine residues is critical for the function of PNAG, we investigated the role of GAG deacetylation in fungal biofilm formation. Agd3 was found to mediate deacetylation of GalNAc residues within GAG and render the polysaccharide polycationic. As with PNAG, deacetylation is required for the adherence of GAG to hyphae and for biofilm formation. Growth of the Δagd3 mutant in the presence of culture supernatants of the GAG-deficient Δuge3 mutant rescued the biofilm defect of the Δagd3 mutant and restored the adhesive properties of GAG, suggesting that deacetylation is an extracellular process. The GAG biosynthetic gene cluster is present in the genomes of members of the Pezizomycotina subphylum of the Ascomycota including a number of plant-pathogenic fungi and a single basidiomycete species, Trichosporon asahii, likely a result of recent horizontal gene transfer. The current study demonstrates that the production of cationic, deacetylated exopolysaccharides is a strategy used by both fungi and bacteria for biofilm formation. This study sheds light on the biosynthetic pathways governing the synthesis of galactosaminogalactan (GAG), which plays a key role in A. fumigatus virulence and biofilm formation. We find that bacteria and fungi use similar strategies to synthesize adhesive biofilm exopolysaccharides. The presence of orthologs of the GAG biosynthetic gene clusters in multiple fungi suggests that this exopolysaccharide may also be important in the virulence of other fungal pathogens. Further, these studies establish a molecular mechanism of adhesion in which GAG interacts via charge-charge interactions to bind to both fungal hyphae and other substrates. Finally, the importance of deacetylation in the synthesis of functional GAG and the extracellular localization of this process suggest that inhibition of deacetylation may be an attractive target for the development of novel antifungal therapies.
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Abstract
The piggyBac transposon was originally isolated from the cabbage looper moth, Trichoplusia ni, in the 1980s. Despite its early discovery and dissimilarity to the other DNA transposon families, the piggyBac transposon was not recognized as a member of a large transposon superfamily for a long time. Initially, the piggyBac transposon was thought to be a rare transposon. This view, however, has now been completely revised as a number of fully sequenced genomes have revealed the presence of piggyBac-like repetitive elements. The isolation of active copies of the piggyBac-like elements from several distinct species further supported this revision. This includes the first isolation of an active mammalian DNA transposon identified in the bat genome. To date, the piggyBac transposon has been deeply characterized and it represents a number of unique characteristics. In general, all members of the piggyBac superfamily use TTAA as their integration target sites. In addition, the piggyBac transposon shows precise excision, i.e., restoring the sequence to its preintegration state, and can transpose in a variety of organisms such as yeasts, malaria parasites, insects, mammals, and even in plants. Biochemical analysis of the chemical steps of transposition revealed that piggyBac does not require DNA synthesis during the actual transposition event. The broad host range has attracted researchers from many different fields, and the piggyBac transposon is currently the most widely used transposon system for genetic manipulations.
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Abstract
The IS630-Tc1-mariner (ITm) family of transposons is one of the most widespread in nature. The phylogenetic distribution of its members shows that they do not persist for long in a given lineage, but rely on frequent horizontal transfer to new hosts. Although they are primarily selfish genomic-parasites, ITm transposons contribute to the evolution of their hosts because they generate variation and contribute protein domains and regulatory regions. Here we review the molecular mechanism of ITm transposition and its regulation. We focus mostly on the mariner elements, which are understood in the greatest detail owing to in vitro reconstitution and structural analysis. Nevertheless, the most important characteristics are probably shared across the grouping. Members of the ITm family are mobilized by a cut-and-paste mechanism and integrate at 5'-TA dinucleotide target sites. The elements encode a single transposase protein with an N-terminal DNA-binding domain and a C-terminal catalytic domain. The phosphoryl-transferase reactions during the DNA-strand breaking and joining reactions are performed by the two metal-ion mechanism. The metal ions are coordinated by three or four acidic amino acid residues located within an RNase H-like structural fold. Although all of the strand breaking and joining events at a given transposon end are performed by a single molecule of transposase, the reaction is coordinated by close communication between transpososome components. During transpososome assembly, transposase dimers compete for free transposon ends. This helps to protect the host by dampening an otherwise exponential increase in the rate of transposition as the copy number increases.
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118
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Gao B, Shen D, Xue S, Chen C, Cui H, Song C. The contribution of transposable elements to size variations between four teleost genomes. Mob DNA 2016; 7:4. [PMID: 26862351 PMCID: PMC4746887 DOI: 10.1186/s13100-016-0059-7] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 01/11/2016] [Indexed: 11/23/2022] Open
Abstract
Background Teleosts are unique among vertebrates, with a wide range of haploid genome sizes in very close lineages, varying from less than 400 mega base pairs (Mb) for pufferfish to over 3000 Mb for salmon. The cause of the difference in genome size remains largely unexplained. Results In this study, we reveal that the differential success of transposable elements (TEs) correlates with the variation of genome size across four representative teleost species (zebrafish, medaka, stickleback, and tetraodon). The larger genomes represent a higher diversity within each clade (superfamily) and family and a greater abundance of TEs compared with the smaller genomes; zebrafish, representing the largest genome, shows the highest diversity and abundance of TEs in its genome, followed by medaka and stickleback; while the tetraodon, representing the most compact genome, displays the lowest diversity and density of TEs in its genome. Both of Class I (retrotransposons) and Class II TEs (DNA transposons) contribute to the difference of TE accumulation of teleost genomes, however, Class II TEs are the major component of the larger teleost genomes analyzed and the most important contributors to genome size variation across teleost lineages. The hAT and Tc1/Mariner superfamilies are the major DNA transposons of all four investigated teleosts. Divergence distribution revealed contrasting proliferation dynamics both between clades of retrotransposons and between species. The TEs within the larger genomes of the zebrafish and medaka represent relatively stronger activity with an extended time period during the evolution history, in contrast with the very young activity in the smaller stickleback genome, or the very low level of activity in the tetraodon genome. Conclusion Overall, our data shows that teleosts represent contrasting profiles of mobilomes with a differential density, diversity and activity of TEs. The differences in TE accumulation, dominated by DNA transposons, explain the main size variations of genomes across the investigated teleost species, and the species differences in both diversity and activity of TEs contributed to the variations of TE accumulations across the four teleost species. TEs play major roles in teleost genome evolution. Electronic supplementary material The online version of this article (doi:10.1186/s13100-016-0059-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Bo Gao
- Institute of Epigenetics & Epigenomics, College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009 China
| | - Dan Shen
- Institute of Epigenetics & Epigenomics, College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009 China
| | - Songlei Xue
- Institute of Epigenetics & Epigenomics, College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009 China
| | - Cai Chen
- Institute of Epigenetics & Epigenomics, College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009 China
| | - Hengmi Cui
- Institute of Epigenetics & Epigenomics, College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009 China
| | - Chengyi Song
- Institute of Epigenetics & Epigenomics, College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009 China
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Fernández-Medina RD, Granzotto A, Ribeiro JM, Carareto CMA. Transposition burst of mariner-like elements in the sequenced genome of Rhodnius prolixus. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2016; 69:14-24. [PMID: 26363296 DOI: 10.1016/j.ibmb.2015.09.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Revised: 08/28/2015] [Accepted: 09/06/2015] [Indexed: 06/05/2023]
Abstract
Transposable elements (TEs) are widespread in insect's genomes. However, there are wide differences in the proportion of the total DNA content occupied by these repetitive sequences in different species. We have analyzed the TEs present in R. prolixus (vector of the Chagas disease) and showed that 3.0% of this genome is occupied by Class II TEs, belonging mainly to the Tc1-mariner superfamily (1.65%) and MITEs (1.84%). Interestingly, most of this genomic content is due to the expansion of two subfamilies belonging to: irritans himar, a well characterized subfamily of mariners, and prolixus1, one of the two novel subfamilies here described. The high amount of sequences in these subfamilies suggests that bursts of transposition occurred during the life cycle of this family. In an attempt to characterize these elements, we performed an in silico analysis of the sequences corresponding to the DDD/E domain of the transposase gene. We performed an evolutionary analysis including network and Bayesian coalescent-based methods in order to infer the dynamics of the amplification, as well as to estimate the time of the bursts identified in these subfamilies. Given our data, we hypothesized that the TE expansions occurred around the time of speciation of R. prolixus around 1.4 mya. This suggestion lays on the "Transposon Model" of TE evolution, in which the members of a TE population that are replicative active are present at multiple loci in the genome, but their replicative potential varies, and of the "Life Cycle Model" that states that when present-day TEs have been involved in amplification bursts, they share an ancestral copy that dates back to this initial amplification.
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Affiliation(s)
- R D Fernández-Medina
- Fundação Oswaldo Cruz, Programa de Computação Científica, Av. Brasil, 4365, Rio de Janeiro, Brazil.
| | - A Granzotto
- UNESP - Univ. Estadual Paulista, Departamento de Biologia, São José do Rio Preto, SP, Brazil.
| | - J M Ribeiro
- Laboratory of Malaria and Vector Research, NIAID-NIH, Bethesda, MD, USA.
| | - C M A Carareto
- UNESP - Univ. Estadual Paulista, Departamento de Biologia, São José do Rio Preto, SP, Brazil.
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Zhao D, Ferguson AA, Jiang N. What makes up plant genomes: The vanishing line between transposable elements and genes. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2015; 1859:366-80. [PMID: 26709091 DOI: 10.1016/j.bbagrm.2015.12.005] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 12/09/2015] [Accepted: 12/11/2015] [Indexed: 02/07/2023]
Abstract
The ultimate source of evolution is mutation. As the largest component in plant genomes, transposable elements (TEs) create numerous types of mutations that cannot be mimicked by other genetic mechanisms. When TEs insert into genomic sequences, they influence the expression of nearby genes as well as genes unlinked to the insertion. TEs can duplicate, mobilize, and recombine normal genes or gene fragments, with the potential to generate new genes or modify the structure of existing genes. TEs also donate their transposase coding regions for cellular functions in a process called TE domestication. Despite the host defense against TE activity, a subset of TEs survived and thrived through discreet selection of transposition activity, target site, element size, and the internal sequence. Finally, TEs have established strategies to reduce the efficacy of host defense system by increasing the cost of silencing TEs. This review discusses the recent progress in the area of plant TEs with a focus on the interaction between TEs and genes.
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Affiliation(s)
- Dongyan Zhao
- Department of Horticulture, Michigan State University, 1066 Bogue Street, East Lansing, MI 48824, USA
| | - Ann A Ferguson
- Department of Horticulture, Michigan State University, 1066 Bogue Street, East Lansing, MI 48824, USA
| | - Ning Jiang
- Department of Horticulture, Michigan State University, 1066 Bogue Street, East Lansing, MI 48824, USA.
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Tc1-like Transposase Thm3 of Silver Carp (Hypophthalmichthys molitrix) Can Mediate Gene Transposition in the Genome of Blunt Snout Bream (Megalobrama amblycephala). G3-GENES GENOMES GENETICS 2015; 5:2601-10. [PMID: 26438298 PMCID: PMC4683633 DOI: 10.1534/g3.115.020933] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Tc1-like transposons consist of an inverted repeat sequence flanking a transposase gene that exhibits similarity to the mobile DNA element, Tc1, of the nematode, Caenorhabditis elegans. They are widely distributed within vertebrate genomes including teleost fish; however, few active Tc1-like transposases have been discovered. In this study, 17 Tc1-like transposon sequences were isolated from 10 freshwater fish species belonging to the families Cyprinidae, Adrianichthyidae, Cichlidae, and Salmonidae. We conducted phylogenetic analyses of these sequences using previously isolated Tc1-like transposases and report that 16 of these elements comprise a new subfamily of Tc1-like transposons. In particular, we show that one transposon, Thm3 from silver carp (Hypophthalmichthys molitrix; Cyprinidae), can encode a 335-aa transposase with apparently intact domains, containing three to five copies in its genome. We then coinjected donor plasmids harboring 367 bp of the left end and 230 bp of the right end of the nonautonomous silver carp Thm1 cis-element along with capped Thm3 transposase RNA into the embryos of blunt snout bream (Megalobrama amblycephala; one- to two-cell embryos). This experiment revealed that the average integration rate could reach 50.6% in adult fish. Within the blunt snout bream genome, the TA dinucleotide direct repeat, which is the signature of Tc1-like family of transposons, was created adjacent to both ends of Thm1 at the integration sites. Our results indicate that the silver carp Thm3 transposase can mediate gene insertion by transposition within the genome of blunt snout bream genome, and that this occurs with a TA position preference.
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122
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Markova DN, Mason-Gamer RJ. The Role of Vertical and Horizontal Transfer in the Evolutionary Dynamics of PIF-Like Transposable Elements in Triticeae. PLoS One 2015; 10:e0137648. [PMID: 26355747 PMCID: PMC4565680 DOI: 10.1371/journal.pone.0137648] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 08/20/2015] [Indexed: 11/19/2022] Open
Abstract
PIF-like transposable elements are members of the PIF/Harbinger superfamily of DNA transposons found in the genomes of many plants, animals, and fungi. The evolution of the gene that encodes the transposase responsible for mobilizing PIF-like elements has been studied in both plants and animals, but the elements' history in flowering plants remains poorly known. In this work, we describe the phylogenetic distribution and evolution of PIF-like elements in the genomes of 21 diploid species from the wheat tribe, Triticeae, and we present the first convincing evidence of horizontal transfer of PIF elements in plant genomes. A phylogenetic analysis of 240 PIF sequences based on the conserved region of the transposase domain revealed at least four main transposase lineages. Their complex evolutionary history can be best explained by a combination of vertical transmission with differential evolutionary success among lineages, and occasional horizontal transfer between phylogenetically distant Triticeae genera. In addition, we identified 127 potentially functional transposase sequences indicating possible recent activity of PIF.
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Affiliation(s)
- Dragomira N. Markova
- Department of Biological Sciences, University of Illinois at Chicago, Chicago, IL, United States of America
| | - Roberta J. Mason-Gamer
- Department of Biological Sciences, University of Illinois at Chicago, Chicago, IL, United States of America
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Gilbert DM, Bridges MC, Strother AE, Burckhalter CE, Burnette JM, Hancock CN. Precise repair of mPing excision sites is facilitated by target site duplication derived microhomology. Mob DNA 2015; 6:15. [PMID: 26347803 PMCID: PMC4561436 DOI: 10.1186/s13100-015-0046-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 08/28/2015] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND A key difference between the Tourist and Stowaway families of miniature inverted repeat transposable elements (MITEs) is the manner in which their excision alters the genome. Upon excision, Stowaway-like MITEs and the associated Mariner elements usually leave behind a small duplication and short sequences from the end of the element. These small insertions or deletions known as "footprints" can potentially disrupt coding or regulatory sequences. In contrast, Tourist-like MITEs and the associated PIF/Pong/Harbinger elements generally excise precisely, returning the genome to its original state. The purpose of this study was to determine the mechanisms underlying these excision differences, including the role of the host DNA repair mechanisms. RESULTS The transposition of the Tourist-like element, mPing, and the Stowaway-like element, 14T32, were evaluated using yeast transposition assays. Assays performed in yeast strains lacking non-homologous end joining (NHEJ) enzymes indicated that the excision sites of both elements were primarily repaired by NHEJ. Altering the target site duplication (TSD) sequences that flank these elements reduced the transposition frequency. Using yeast strains with the ability to repair the excision site by homologous repair showed that some TSD changes disrupt excision of the element. Changing the ends of mPing to produce non-matching TSDs drastically reduced repair of the excision site and resulted in increased generation of footprints. CONCLUSIONS Together these results indicate that the difference in Tourist and Stowaway excision sites results from transposition mechanism characteristics. The TSDs of both elements play a role in element excision, but only the mPing TSDs actively participate in excision site repair. Our data suggests that Tourist-like elements excise with staggered cleavage of the TSDs, which provides microhomology that facilitates precise repair. This slight modification in the transposition mechanism results in more efficient repair of the double stranded break, and thus, may be less harmful to host genomes by disrupting fewer genes.
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Affiliation(s)
- David M Gilbert
- Department of Biology and Geology, University of South Carolina Aiken, 471 University Parkway, Aiken, SC 29801 USA
| | - M Catherine Bridges
- Present Address: Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425 USA
| | - Ashley E Strother
- Department of Biology and Geology, University of South Carolina Aiken, 471 University Parkway, Aiken, SC 29801 USA
| | - Courtney E Burckhalter
- Department of Biology and Geology, University of South Carolina Aiken, 471 University Parkway, Aiken, SC 29801 USA
| | - James M Burnette
- Present Address: College of Natural and Agricultural Sciences, University of California Riverside, Riverside, CA 92521 USA
| | - C Nathan Hancock
- Department of Biology and Geology, University of South Carolina Aiken, 471 University Parkway, Aiken, SC 29801 USA
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Terencio ML, Schneider CH, Gross MC, do Carmo EJ, Nogaroto V, de Almeida MC, Artoni RF, Vicari MR, Feldberg E. Repetitive sequences: the hidden diversity of heterochromatin in prochilodontid fish. COMPARATIVE CYTOGENETICS 2015; 9:465-481. [PMID: 26752156 PMCID: PMC4698564 DOI: 10.3897/compcytogen.v9i4.5299] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 06/17/2015] [Indexed: 06/05/2023]
Abstract
The structure and organization of repetitive elements in fish genomes are still relatively poorly understood, although most of these elements are believed to be located in heterochromatic regions. Repetitive elements are considered essential in evolutionary processes as hotspots for mutations and chromosomal rearrangements, among other functions - thus providing new genomic alternatives and regulatory sites for gene expression. The present study sought to characterize repetitive DNA sequences in the genomes of Semaprochilodus insignis (Jardine & Schomburgk, 1841) and Semaprochilodus taeniurus (Valenciennes, 1817) and identify regions of conserved syntenic blocks in this genome fraction of three species of Prochilodontidae (Semaprochilodus insignis, Semaprochilodus taeniurus, and Prochilodus lineatus (Valenciennes, 1836) by cross-FISH using Cot-1 DNA (renaturation kinetics) probes. We found that the repetitive fractions of the genomes of Semaprochilodus insignis and Semaprochilodus taeniurus have significant amounts of conserved syntenic blocks in hybridization sites, but with low degrees of similarity between them and the genome of Prochilodus lineatus, especially in relation to B chromosomes. The cloning and sequencing of the repetitive genomic elements of Semaprochilodus insignis and Semaprochilodus taeniurus using Cot-1 DNA identified 48 fragments that displayed high similarity with repetitive sequences deposited in public DNA databases and classified as microsatellites, transposons, and retrotransposons. The repetitive fractions of the Semaprochilodus insignis and Semaprochilodus taeniurus genomes exhibited high degrees of conserved syntenic blocks in terms of both the structures and locations of hybridization sites, but a low degree of similarity with the syntenic blocks of the Prochilodus lineatus genome. Future comparative analyses of other prochilodontidae species will be needed to advance our understanding of the organization and evolution of the genomes in this group of fish.
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Affiliation(s)
- Maria L Terencio
- Federal University of Integration American-Latin (Universidade Federal da Integração Latino-Americana), Laboratory of Genetics, Av. Tarquínio Joslin dos Santos, 1000, Jardim Universitário, Foz do Iguaçu, PR, Brazil 85857-190
| | - Carlos H Schneider
- Federal University of Amazonas (Universidade Federal do Amazonas), Institute of Biological Sciences, Department of Genetics, Laboratory of Animal Cytogenomics, Manaus, AM, Brazil
| | - Maria C Gross
- Federal University of Amazonas (Universidade Federal do Amazonas), Institute of Biological Sciences, Department of Genetics, Laboratory of Animal Cytogenomics, Manaus, AM, Brazil
| | - Edson Junior do Carmo
- Federal University of Amazonas, Institute of Biological Sciences, Laboratory of DNA Technologies, Manaus, AM, Brazil
| | - Viviane Nogaroto
- State University of Ponta Grossa, Department of Structural and Molecular Biology and Genetics, Laboratory of Cytogenetics and Evolution, Ponta Grossa, PR, Brazil
| | - Mara Cristina de Almeida
- State University of Ponta Grossa, Department of Structural and Molecular Biology and Genetics, Laboratory of Cytogenetics and Evolution, Ponta Grossa, PR, Brazil
| | - Roberto Ferreira Artoni
- State University of Ponta Grossa, Department of Structural and Molecular Biology and Genetics, Laboratory of Cytogenetics and Evolution, Ponta Grossa, PR, Brazil
| | - Marcelo R Vicari
- State University of Ponta Grossa, Department of Structural and Molecular Biology and Genetics, Laboratory of Cytogenetics and Evolution, Ponta Grossa, PR, Brazil
| | - Eliana Feldberg
- National Institute of Amazonian Research, Laboratory of Animal Genetics, Av. André Araújo, 2936, Petrópolis, Manaus, AM, Brazil 69011-970
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Abstract
Pong-like elements are members of the PIF/Harbinger superfamily of DNA transposons that has been described in many plants, animals, and fungi. Most Pong elements contain two open reading frames (ORFs). One encodes a transposase (ORF2) that catalyzes transposition of Pong and related non-autonomous elements, while the function of the second is unknown. Little is known about the evolutionary history of Pong elements in flowering plants. In this work, we present the first comprehensive analysis of the diversity, abundance, and evolution of the Pong-like transposase gene in the genomes of 21 diploid species from the wheat tribe, Triticeae, and we present the first convincing evidence of horizontal transfer of nuclear-encoded Pong elements in any organism. A phylogenetic analysis of nearly 300 Pong sequences based on a conserved region of the transposase domain revealed a complex evolutionary history of Pong elements that can be best explained by ancestral polymorphism, followed by differential evolutionary success of some transposase lineages, and by occasional horizontal transfer between phylogenetically distant genera. In addition, we used transposon display to estimate the abundance of the transposase gene within Triticeae genomes, and our results revealed varying levels of Pong proliferation, with numbers of transposase copies ranging from 22 to 92. Comparisons of Pong transposase abundance to flow cytometry estimates of genome size revealed that larger Triticeae genome size was not correlated with transposase abundance.
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126
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Morales ME, Servant G, Ade C, Roy-Enge AM. Altering Genomic Integrity: Heavy Metal Exposure Promotes Transposable Element-Mediated Damage. Biol Trace Elem Res 2015; 166:24-33. [PMID: 25774044 PMCID: PMC4696754 DOI: 10.1007/s12011-015-0298-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 03/03/2015] [Indexed: 12/13/2022]
Abstract
Maintenance of genomic integrity is critical for cellular homeostasis and survival. The active transposable elements (TEs) composed primarily of three mobile element lineages LINE-1, Alu, and SVA comprise approximately 30% of the mass of the human genome. For the past 2 decades, studies have shown that TEs significantly contribute to genetic instability and that TE-caused damages are associated with genetic diseases and cancer. Different environmental exposures, including several heavy metals, influence how TEs interact with its host genome increasing their negative impact. This mini-review provides some basic knowledge on TEs, their contribution to disease, and an overview of the current knowledge on how heavy metals influence TE-mediated damage.
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Affiliation(s)
- Maria E. Morales
- Department of Epidemiology and Tulane Cancer Center, SL-66, Tulane University Health Sciences Center, 1430 Tulane Ave., New Orleans, LA 70112
| | - Geraldine Servant
- Department of Epidemiology and Tulane Cancer Center, SL-66, Tulane University Health Sciences Center, 1430 Tulane Ave., New Orleans, LA 70112
| | - Catherine Ade
- Department of Cellular and Molecular Biology, Tulane University Health Sciences Center, 1430 Tulane Ave., New Orleans, LA 70112
| | - Astrid M. Roy-Enge
- Department of Epidemiology and Tulane Cancer Center, SL-66, Tulane University Health Sciences Center, 1430 Tulane Ave., New Orleans, LA 70112
- Corresponding author: Astrid M. Roy-Engel, Ph.D., Department of Epidemiology, Tulane Cancer Center, SL66, Tulane University Health Sciences Center, 1430 Tulane Ave., New Orleans, LA 70112. , Phone: (504) 988-6316, Fax: (504) 988-5516
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127
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Han MJ, Xiong CL, Zhang HB, Zhang MQ, Zhang HH, Zhang Z. The diversification of PHIS transposon superfamily in eukaryotes. Mob DNA 2015; 6:12. [PMID: 26120370 PMCID: PMC4482050 DOI: 10.1186/s13100-015-0043-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 06/17/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND PHIS transposon superfamily belongs to DNA transposons and includes PIF/Harbinger, ISL2EU, and Spy transposon groups. These three groups have similar DDE domain-containing transposases; however, their coding capacity, species distribution, and target site duplications (TSDs) are significantly different. RESULTS In this study, we systematically identified and analyzed PHIS transposons in 836 sequenced eukaryotic genomes using transposase homology search and structure approach. In total, 380 PHIS families were identified in 112 genomes and 168 of 380 families were firstly reported in this study. Besides previous identified PIF/Harbinger, ISL2EU, and Spy groups, three new types (called Pangu, NuwaI, and NuwaII) of PHIS superfamily were identified; each has its own distinctive characteristics, especially in TSDs. Pangu and NuwaII transposons are characterized by 5'-ANT-3' and 5'-C|TNA|G-3' TSDs, respectively. Both transposons are widely distributed in plants, fungi, and animals; the NuwaI transposons are characterized by 5'-CWG-3' TSDs and mainly distributed in animals. CONCLUSIONS Here, in total, 380 PHIS families were identified in eukaryotes. Among these 380 families, 168 were firstly reported in this study. Furthermore, three new types of PHIS superfamily were identified. Our results not only enrich the transposon diversity but also have extensive significance for improving genome sequence assembly and annotation of higher organisms.
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Affiliation(s)
- Min-Jin Han
- School of Life Sciences, Chongqing University, Chongqing, 400044 China
| | - Chu-Lin Xiong
- School of Life Sciences, Chongqing University, Chongqing, 400044 China
| | - Hong-Bo Zhang
- School of Life Sciences, Chongqing University, Chongqing, 400044 China
| | - Meng-Qiang Zhang
- School of Life Sciences, Chongqing University, Chongqing, 400044 China
| | - Hua-Hao Zhang
- College of Pharmacy and Life Science, Jiujiang University, Jiujiang, 332000 China
| | - Ze Zhang
- School of Life Sciences, Chongqing University, Chongqing, 400044 China
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Abstract
Genome defense likely evolved to curtail the spread of transposable elements and invading viruses. A combination of effective defense mechanisms has been shown to limit colonization of the Neurospora crassa genome by transposable elements. A novel DNA transposon named Sly1-1 was discovered in the genome of the most widely used laboratory "wild-type" strain FGSC 2489 (OR74A). Meiotic silencing by unpaired DNA, also simply called meiotic silencing, prevents the expression of regions of the genome that are unpaired during karyogamy. This mechanism is posttranscriptional and is proposed to involve the production of small RNA, so-called masiRNAs, by proteins homologous to those involved in RNA interference-silencing pathways in animals, fungi, and plants. Here, we demonstrate production of small RNAs when Sly1-1 was unpaired in a cross between two wild-type strains. These small RNAs are dependent on SAD-1, an RNA-dependent RNA polymerase necessary for meiotic silencing. We present the first case of endogenously produced masiRNA from a novel N. crassa DNA transposable element.
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Sun C, Feschotte C, Wu Z, Mueller RL. DNA transposons have colonized the genome of the giant virus Pandoravirus salinus. BMC Biol 2015; 13:38. [PMID: 26067596 PMCID: PMC4495683 DOI: 10.1186/s12915-015-0145-1] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 06/03/2015] [Indexed: 01/06/2023] Open
Abstract
Background Transposable elements are mobile DNA sequences that are widely distributed in prokaryotic and eukaryotic genomes, where they represent a major force in genome evolution. However, transposable elements have rarely been documented in viruses, and their contribution to viral genome evolution remains largely unexplored. Pandoraviruses are recently described DNA viruses with genome sizes that exceed those of some prokaryotes, rivaling parasitic eukaryotes. These large genomes appear to include substantial noncoding intergenic spaces, which provide potential locations for transposable element insertions. However, no mobile genetic elements have yet been reported in pandoravirus genomes. Results Here, we report a family of miniature inverted-repeat transposable elements (MITEs) in the Pandoravirus salinus genome, representing the first description of a virus populated with a canonical transposable element family that proliferated by transposition within the viral genome. The MITE family, which we name Submariner, includes 30 copies with all the hallmarks of MITEs: short length, terminal inverted repeats, TA target site duplication, and no coding capacity. Submariner elements show signs of transposition and are undetectable in the genome of Pandoravirus dulcis, the closest known relative Pandoravirus salinus. We identified a DNA transposon related to Submariner in the genome of Acanthamoeba castellanii, a species thought to host pandoraviruses, which contains remnants of coding sequence for a Tc1/mariner transposase. These observations suggest that the Submariner MITEs of P. salinus belong to the widespread Tc1/mariner superfamily and may have been mobilized by an amoebozoan host. Ten of the 30 MITEs in the P. salinus genome are located within coding regions of predicted genes, while others are close to genes, suggesting that these transposons may have contributed to viral genetic novelty. Conclusions Our discovery highlights the remarkable ability of DNA transposons to colonize and shape genomes from all domains of life, as well as giant viruses. Our findings continue to blur the division between viral and cellular genomes, adhering to the emerging view that the content, dynamics, and evolution of the genomes of giant viruses do not substantially differ from those of cellular organisms. Electronic supplementary material The online version of this article (doi:10.1186/s12915-015-0145-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Cheng Sun
- Department of Biology, Colorado State University, Campus Delivery 1878, Fort Collins, CO, 80523-1878, USA.
| | - Cédric Feschotte
- Department of Human Genetics, The University of Utah, Salt Lake City, UT, 84112, USA.
| | - Zhiqiang Wu
- Department of Biology, Colorado State University, Campus Delivery 1878, Fort Collins, CO, 80523-1878, USA.
| | - Rachel Lockridge Mueller
- Department of Biology, Colorado State University, Campus Delivery 1878, Fort Collins, CO, 80523-1878, USA.
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130
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Kapheim KM, Pan H, Li C, Salzberg SL, Puiu D, Magoc T, Robertson HM, Hudson ME, Venkat A, Fischman BJ, Hernandez A, Yandell M, Ence D, Holt C, Yocum GD, Kemp WP, Bosch J, Waterhouse RM, Zdobnov EM, Stolle E, Kraus FB, Helbing S, Moritz RFA, Glastad KM, Hunt BG, Goodisman MAD, Hauser F, Grimmelikhuijzen CJP, Pinheiro DG, Nunes FMF, Soares MPM, Tanaka ÉD, Simões ZLP, Hartfelder K, Evans JD, Barribeau SM, Johnson RM, Massey JH, Southey BR, Hasselmann M, Hamacher D, Biewer M, Kent CF, Zayed A, Blatti C, Sinha S, Johnston JS, Hanrahan SJ, Kocher SD, Wang J, Robinson GE, Zhang G. Social evolution. Genomic signatures of evolutionary transitions from solitary to group living. Science 2015; 348:1139-43. [PMID: 25977371 PMCID: PMC5471836 DOI: 10.1126/science.aaa4788] [Citation(s) in RCA: 239] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Accepted: 05/06/2015] [Indexed: 12/14/2022]
Abstract
The evolution of eusociality is one of the major transitions in evolution, but the underlying genomic changes are unknown. We compared the genomes of 10 bee species that vary in social complexity, representing multiple independent transitions in social evolution, and report three major findings. First, many important genes show evidence of neutral evolution as a consequence of relaxed selection with increasing social complexity. Second, there is no single road map to eusociality; independent evolutionary transitions in sociality have independent genetic underpinnings. Third, though clearly independent in detail, these transitions do have similar general features, including an increase in constrained protein evolution accompanied by increases in the potential for gene regulation and decreases in diversity and abundance of transposable elements. Eusociality may arise through different mechanisms each time, but would likely always involve an increase in the complexity of gene networks.
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Affiliation(s)
- Karen M Kapheim
- Carl R. WoeseInstitute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Department of Biology, Utah State University, Logan, UT 84322, USA.
| | - Hailin Pan
- China National GeneBank, BGI-Shenzhen, Shenzhen, 518083, China
| | - Cai Li
- China National GeneBank, BGI-Shenzhen, Shenzhen, 518083, China. Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Copenhagen, 1350, Denmark
| | - Steven L Salzberg
- Departments of Biomedical Engineering, Computer Science, and Biostatistics, Johns Hopkins University, Baltimore, MD 21218, USA. Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Daniela Puiu
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Tanja Magoc
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Hugh M Robertson
- Carl R. WoeseInstitute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Matthew E Hudson
- Carl R. WoeseInstitute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Aarti Venkat
- Carl R. WoeseInstitute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Department of Human Genetics, University of Chicago, Chicago, IL 60637, USA
| | - Brielle J Fischman
- Carl R. WoeseInstitute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Program in Ecology and Evolutionary Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Department of Biology, Hobart and William Smith Colleges, Geneva, NY 14456, USA
| | - Alvaro Hernandez
- Roy J. Carver Biotechnology Center, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Mark Yandell
- Department of Human Genetics, Eccles Institute of Human Genetics, University of Utah, Salt Lake City, UT 84112, USA. USTAR Center for Genetic Discovery, University of Utah, Salt Lake City, UT 84112, USA
| | - Daniel Ence
- Department of Human Genetics, Eccles Institute of Human Genetics, University of Utah, Salt Lake City, UT 84112, USA
| | - Carson Holt
- Department of Human Genetics, Eccles Institute of Human Genetics, University of Utah, Salt Lake City, UT 84112, USA. USTAR Center for Genetic Discovery, University of Utah, Salt Lake City, UT 84112, USA
| | - George D Yocum
- U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS) Red River Valley Agricultural Research Center, Biosciences Research Laboratory, Fargo, ND 58102, USA
| | - William P Kemp
- U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS) Red River Valley Agricultural Research Center, Biosciences Research Laboratory, Fargo, ND 58102, USA
| | - Jordi Bosch
- Center for Ecological Research and Forestry Applications (CREAF), Universitat Autonoma de Barcelona, 08193 Bellaterra, Spain
| | - Robert M Waterhouse
- Department of Genetic Medicine and Development, University of Geneva Medical School, 1211 Geneva, Switzerland. Swiss Institute of Bioinformatics, 1211 Geneva, Switzerland. Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA. The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Evgeny M Zdobnov
- Department of Genetic Medicine and Development, University of Geneva Medical School, 1211 Geneva, Switzerland. Swiss Institute of Bioinformatics, 1211 Geneva, Switzerland
| | - Eckart Stolle
- Institute of Biology, Department Zoology, Martin-Luther-University Halle-Wittenberg, Hoher Weg 4, D-06099 Halle (Saale), Germany. Queen Mary University of London, School of Biological and Chemical Sciences Organismal Biology Research Group, London E1 4NS, UK
| | - F Bernhard Kraus
- Institute of Biology, Department Zoology, Martin-Luther-University Halle-Wittenberg, Hoher Weg 4, D-06099 Halle (Saale), Germany. Department of Laboratory Medicine, University Hospital Halle, Ernst Grube Strasse 40, D-06120 Halle (Saale), Germany
| | - Sophie Helbing
- Institute of Biology, Department Zoology, Martin-Luther-University Halle-Wittenberg, Hoher Weg 4, D-06099 Halle (Saale), Germany
| | - Robin F A Moritz
- Institute of Biology, Department Zoology, Martin-Luther-University Halle-Wittenberg, Hoher Weg 4, D-06099 Halle (Saale), Germany. German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, 04103 Leipzig, Germany
| | - Karl M Glastad
- School of Biology, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Brendan G Hunt
- Department of Entomology, University of Georgia, Griffin, GA 30223, USA
| | | | - Frank Hauser
- Center for Functional and Comparative Insect Genomics, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Cornelis J P Grimmelikhuijzen
- Center for Functional and Comparative Insect Genomics, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Daniel Guariz Pinheiro
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901 Ribeirão Preto, SP, Brazil. Departamento de Tecnologia, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista (UNESP), 14884-900 Jaboticabal, SP, Brazil
| | - Francis Morais Franco Nunes
- Departamento de Genética e Evolução, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil
| | - Michelle Prioli Miranda Soares
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901 Ribeirão Preto, SP, Brazil
| | - Érica Donato Tanaka
- Departamento de Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, 14049-900 Ribeirão Preto, SP, Brazil
| | - Zilá Luz Paulino Simões
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901 Ribeirão Preto, SP, Brazil
| | - Klaus Hartfelder
- Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, 14049-900 Ribeirão Preto, SP, Brazil
| | - Jay D Evans
- USDA-ARS Bee Research Lab, Beltsville, MD 20705 USA
| | - Seth M Barribeau
- Department of Biology, East Carolina University, Greenville, NC 27858, USA
| | - Reed M Johnson
- Department of Entomology, Ohio Agricultural Research and Development Center, Ohio State University, Wooster, OH 44691, USA
| | - Jonathan H Massey
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Bruce R Southey
- Department of Animal Sciences, University of Illinois, Urbana, IL 61801, USA
| | - Martin Hasselmann
- Department of Population Genomics, Institute of Animal Husbandry and Animal Breeding, University of Hohenheim, Germany
| | - Daniel Hamacher
- Department of Population Genomics, Institute of Animal Husbandry and Animal Breeding, University of Hohenheim, Germany
| | - Matthias Biewer
- Department of Population Genomics, Institute of Animal Husbandry and Animal Breeding, University of Hohenheim, Germany
| | - Clement F Kent
- Department of Biology, York University, Toronto, ON M3J 1P3, Canada. Janelia Farm Research Campus, Howard Hughes Medical Institue, Ashburn, VA 20147, USA
| | - Amro Zayed
- Department of Biology, York University, Toronto, ON M3J 1P3, Canada
| | - Charles Blatti
- Carl R. WoeseInstitute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Department of Computer Science, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Saurabh Sinha
- Carl R. WoeseInstitute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Department of Computer Science, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - J Spencer Johnston
- Department of Entomology, Texas A&M University, College Station, TX 77843, USA
| | - Shawn J Hanrahan
- Department of Entomology, Texas A&M University, College Station, TX 77843, USA
| | - Sarah D Kocher
- Department of Organismic and Evolutionary Biology, Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138, USA
| | - Jun Wang
- China National GeneBank, BGI-Shenzhen, Shenzhen, 518083, China. Department of Biology, University of Copenhagen, 2200 Copenhagen, Denmark. Princess Al Jawhara Center of Excellence in the Research of Hereditary Disorders, King Abdulaziz University, Jeddah 21589, Saudi Arabia. Macau University of Science and Technology, Avenida Wai long, Taipa, Macau 999078, China. Department of Medicine, University of Hong Kong, Hong Kong.
| | - Gene E Robinson
- Carl R. WoeseInstitute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Center for Advanced Study Professor in Entomology and Neuroscience, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Guojie Zhang
- China National GeneBank, BGI-Shenzhen, Shenzhen, 518083, China. Centre for Social Evolution, Department of Biology, Universitetsparken 15, University of Copenhagen, DK-2100 Copenhagen, Denmark.
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131
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Bao W, Kojima KK, Kohany O. Repbase Update, a database of repetitive elements in eukaryotic genomes. Mob DNA 2015; 6:11. [PMID: 26045719 PMCID: PMC4455052 DOI: 10.1186/s13100-015-0041-9] [Citation(s) in RCA: 1682] [Impact Index Per Article: 186.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 04/17/2015] [Indexed: 02/08/2023] Open
Abstract
Repbase Update (RU) is a database of representative repeat sequences in eukaryotic genomes. Since its first development as a database of human repetitive sequences in 1992, RU has been serving as a well-curated reference database fundamental for almost all eukaryotic genome sequence analyses. Here, we introduce recent updates of RU, focusing on technical issues concerning the submission and updating of Repbase entries and will give short examples of using RU data. RU sincerely invites a broader submission of repeat sequences from the research community.
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Affiliation(s)
- Weidong Bao
- Genetic Information Research Institute, 5150 El Camino Real, Ste B-30, Los Altos, CA 94022 USA
| | - Kenji K Kojima
- Genetic Information Research Institute, 5150 El Camino Real, Ste B-30, Los Altos, CA 94022 USA ; Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, University of Tokyo, Minato-ku, Tokyo Japan ; Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai Minato-ku, Tokyo, 108-8639 Japan
| | - Oleksiy Kohany
- Genetic Information Research Institute, 5150 El Camino Real, Ste B-30, Los Altos, CA 94022 USA
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132
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Kuan CS, Yew SM, Toh YF, Chan CL, Ngeow YF, Lee KW, Na SL, Yee WY, Hoh CC, Ng KP. Dissecting the fungal biology of Bipolaris papendorfii: from phylogenetic to comparative genomic analysis. DNA Res 2015; 22:219-32. [PMID: 25922537 PMCID: PMC4463846 DOI: 10.1093/dnares/dsv007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2015] [Accepted: 03/28/2015] [Indexed: 01/21/2023] Open
Abstract
Bipolaris papendorfii has been reported as a fungal plant pathogen that rarely causes opportunistic infection in humans. Secondary metabolites isolated from this fungus possess medicinal and anticancer properties. However, its genetic fundamental and basic biology are largely unknown. In this study, we report the first draft genome sequence of B. papendorfii UM 226 isolated from the skin scraping of a patient. The assembled 33.4 Mb genome encodes 11,015 putative coding DNA sequences, of which, 2.49% are predicted transposable elements. Multilocus phylogenetic and phylogenomic analyses showed B. papendorfii UM 226 clustering with Curvularia species, apart from other plant pathogenic Bipolaris species. Its genomic features suggest that it is a heterothallic fungus with a putative unique gene encoding the LysM-containing protein which might be involved in fungal virulence on host plants, as well as a wide array of enzymes involved in carbohydrate metabolism, degradation of polysaccharides and lignin in the plant cell wall, secondary metabolite biosynthesis (including dimethylallyl tryptophan synthase, non-ribosomal peptide synthetase, polyketide synthase), the terpenoid pathway and the caffeine metabolism. This first genomic characterization of B. papendorfii provides the basis for further studies on its biology, pathogenicity and medicinal potential.
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Affiliation(s)
- Chee Sian Kuan
- Department of Medical Microbiology, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Su Mei Yew
- Department of Medical Microbiology, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Yue Fen Toh
- Department of Medical Microbiology, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Chai Ling Chan
- Department of Medical Microbiology, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Yun Fong Ngeow
- Department of Medical Microbiology, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Kok Wei Lee
- Codon Genomics SB, Jalan Bandar Lapan Belas, Selangor Darul Ehsan 47160, Malaysia
| | - Shiang Ling Na
- Department of Medical Microbiology, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Wai-Yan Yee
- Codon Genomics SB, Jalan Bandar Lapan Belas, Selangor Darul Ehsan 47160, Malaysia
| | - Chee-Choong Hoh
- Codon Genomics SB, Jalan Bandar Lapan Belas, Selangor Darul Ehsan 47160, Malaysia
| | - Kee Peng Ng
- Department of Medical Microbiology, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
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133
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Sadd BM, Barribeau SM, Bloch G, de Graaf DC, Dearden P, Elsik CG, Gadau J, Grimmelikhuijzen CJP, Hasselmann M, Lozier JD, Robertson HM, Smagghe G, Stolle E, Van Vaerenbergh M, Waterhouse RM, Bornberg-Bauer E, Klasberg S, Bennett AK, Câmara F, Guigó R, Hoff K, Mariotti M, Munoz-Torres M, Murphy T, Santesmasses D, Amdam GV, Beckers M, Beye M, Biewer M, Bitondi MMG, Blaxter ML, Bourke AFG, Brown MJF, Buechel SD, Cameron R, Cappelle K, Carolan JC, Christiaens O, Ciborowski KL, Clarke DF, Colgan TJ, Collins DH, Cridge AG, Dalmay T, Dreier S, du Plessis L, Duncan E, Erler S, Evans J, Falcon T, Flores K, Freitas FCP, Fuchikawa T, Gempe T, Hartfelder K, Hauser F, Helbing S, Humann FC, Irvine F, Jermiin LS, Johnson CE, Johnson RM, Jones AK, Kadowaki T, Kidner JH, Koch V, Köhler A, Kraus FB, Lattorff HMG, Leask M, Lockett GA, Mallon EB, Antonio DSM, Marxer M, Meeus I, Moritz RFA, Nair A, Näpflin K, Nissen I, Niu J, Nunes FMF, Oakeshott JG, Osborne A, Otte M, Pinheiro DG, Rossié N, Rueppell O, Santos CG, Schmid-Hempel R, Schmitt BD, Schulte C, Simões ZLP, Soares MPM, Swevers L, Winnebeck EC, Wolschin F, Yu N, Zdobnov EM, Aqrawi PK, Blankenburg KP, Coyle M, Francisco L, Hernandez AG, Holder M, Hudson ME, Jackson L, Jayaseelan J, Joshi V, Kovar C, Lee SL, Mata R, Mathew T, Newsham IF, Ngo R, Okwuonu G, Pham C, Pu LL, Saada N, Santibanez J, Simmons D, Thornton R, Venkat A, Walden KKO, Wu YQ, Debyser G, Devreese B, Asher C, Blommaert J, Chipman AD, Chittka L, Fouks B, Liu J, O'Neill MP, Sumner S, Puiu D, Qu J, Salzberg SL, Scherer SE, Muzny DM, Richards S, Robinson GE, Gibbs RA, Schmid-Hempel P, Worley KC. The genomes of two key bumblebee species with primitive eusocial organization. Genome Biol 2015; 16:76. [PMID: 25908251 PMCID: PMC4414376 DOI: 10.1186/s13059-015-0623-3] [Citation(s) in RCA: 249] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 03/10/2015] [Indexed: 12/25/2022] Open
Abstract
Background The shift from solitary to social behavior is one of the major evolutionary transitions. Primitively eusocial bumblebees are uniquely placed to illuminate the evolution of highly eusocial insect societies. Bumblebees are also invaluable natural and agricultural pollinators, and there is widespread concern over recent population declines in some species. High-quality genomic data will inform key aspects of bumblebee biology, including susceptibility to implicated population viability threats. Results We report the high quality draft genome sequences of Bombus terrestris and Bombus impatiens, two ecologically dominant bumblebees and widely utilized study species. Comparing these new genomes to those of the highly eusocial honeybee Apis mellifera and other Hymenoptera, we identify deeply conserved similarities, as well as novelties key to the biology of these organisms. Some honeybee genome features thought to underpin advanced eusociality are also present in bumblebees, indicating an earlier evolution in the bee lineage. Xenobiotic detoxification and immune genes are similarly depauperate in bumblebees and honeybees, and multiple categories of genes linked to social organization, including development and behavior, show high conservation. Key differences identified include a bias in bumblebee chemoreception towards gustation from olfaction, and striking differences in microRNAs, potentially responsible for gene regulation underlying social and other traits. Conclusions These two bumblebee genomes provide a foundation for post-genomic research on these key pollinators and insect societies. Overall, gene repertoires suggest that the route to advanced eusociality in bees was mediated by many small changes in many genes and processes, and not by notable expansion or depauperation. Electronic supplementary material The online version of this article (doi:10.1186/s13059-015-0623-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Ben M Sadd
- School of Biological Sciences, Illinois State University, Normal, IL, 61790, USA. .,Experimental Ecology, Institute of Integrative Biology, Eidgenössiche Technische Hochschule (ETH) Zürich, CH-8092, Zürich, Switzerland.
| | - Seth M Barribeau
- Experimental Ecology, Institute of Integrative Biology, Eidgenössiche Technische Hochschule (ETH) Zürich, CH-8092, Zürich, Switzerland. .,Department of Biology, East Carolina University, Greenville, NC, 27858, USA.
| | - Guy Bloch
- Department of Ecology, Evolution, and Behavior, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel.
| | - Dirk C de Graaf
- Laboratory of Zoophysiology, Faculty of Sciences, Ghent University, Krijgslaan 281, S2, 9000, Ghent, Belgium.
| | - Peter Dearden
- Laboratory for Evolution and Development, Genetics Otago and the National Research Centre for Growth and Development, Department of Biochemistry, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand.
| | - Christine G Elsik
- Division of Animal Sciences, Division of Plant Sciences, and MU Informatics Institute, University of Missouri, Columbia, MO, 65211, USA. .,Department of Biology, Georgetown University, Washington, DC, 20057, USA.
| | - Jürgen Gadau
- School of Life Sciences, Arizona State University, Tempe, AZ, 85287, USA.
| | - Cornelis J P Grimmelikhuijzen
- Center for Functional and Comparative Insect Genomics, Department of Biology, University of Copenhagen, Copenhagen, Denmark.
| | - Martin Hasselmann
- University of Hohenheim, Institute of Animal Science, Garbenstrasse 17, 70599, Stuttgart, Germany.
| | - Jeffrey D Lozier
- Department of Biological Sciences, University of Alabama, Tuscaloosa, AL, 35487, USA.
| | - Hugh M Robertson
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
| | - Guy Smagghe
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.
| | - Eckart Stolle
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Wittenberg, Germany.
| | - Matthias Van Vaerenbergh
- Laboratory of Zoophysiology, Faculty of Sciences, Ghent University, Krijgslaan 281, S2, 9000, Ghent, Belgium.
| | - Robert M Waterhouse
- Department of Genetic Medicine and Development, University of Geneva Medical School, rue Michel-Servet 1, 1211, Geneva, Switzerland. .,Swiss Institute of Bioinformatics, rue Michel-Servet 1, 1211, Geneva, Switzerland. .,Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, 32 Vassar Street, Cambridge, MA, 02139, USA. .,The Broad Institute of MIT and Harvard, 7 Cambridge Center, Cambridge, MA, 02142, USA.
| | - Erich Bornberg-Bauer
- Westfalian Wilhelms University, Institute of Evolution and Biodiversity, Huefferstrasse 1, 48149, Muenster, Germany.
| | - Steffen Klasberg
- Westfalian Wilhelms University, Institute of Evolution and Biodiversity, Huefferstrasse 1, 48149, Muenster, Germany.
| | - Anna K Bennett
- Department of Biology, Georgetown University, Washington, DC, 20057, USA.
| | - Francisco Câmara
- Centre for Genomic Regulation (CRG), Dr. Aiguader 88, 08003, Barcelona, Spain. .,Universitat Pompeu Fabra (UPF), Barcelona, Spain.
| | - Roderic Guigó
- Centre for Genomic Regulation (CRG), Dr. Aiguader 88, 08003, Barcelona, Spain. .,Universitat Pompeu Fabra (UPF), Barcelona, Spain.
| | - Katharina Hoff
- Ernst Moritz Arndt University Greifswald, Institute for Mathematics and Computer Science, Walther-Rathenau-Str. 47, 17487, Greifswald, Germany.
| | - Marco Mariotti
- Centre for Genomic Regulation (CRG), Dr. Aiguader 88, 08003, Barcelona, Spain. .,Universitat Pompeu Fabra (UPF), Barcelona, Spain.
| | - Monica Munoz-Torres
- Department of Biology, Georgetown University, Washington, DC, 20057, USA. .,Genomics Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
| | - Terence Murphy
- National Center for Biotechnology Information, National Library of Medicine, Bethesda, USA.
| | - Didac Santesmasses
- Centre for Genomic Regulation (CRG), Dr. Aiguader 88, 08003, Barcelona, Spain. .,Universitat Pompeu Fabra (UPF), Barcelona, Spain.
| | - Gro V Amdam
- School of Life Sciences, Arizona State University, Tempe, AZ, 85287, USA. .,Department of Chemistry, Biotechnology and Food Science, Norwegian University of Food Science, N-1432, Aas, Norway.
| | - Matthew Beckers
- School of Computing Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK.
| | - Martin Beye
- Institute of Evolutionary Genetics, Heinrich Heine University Duesseldorf, Universitaetsstrasse 1, 40225, Duesseldorf, Germany.
| | - Matthias Biewer
- University of Hohenheim, Institute of Animal Science, Garbenstrasse 17, 70599, Stuttgart, Germany. .,University of Cologne, Institute of Genetics, Cologne, Germany.
| | - Márcia M G Bitondi
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901, Ribeirão Preto, Brazil.
| | - Mark L Blaxter
- Institute of Evolutionary Biology and Edinburgh Genomics, The Ashworth Laboratories, The King's Buildings, University of Edinburgh, Edinburgh, EH9 3FL, UK.
| | - Andrew F G Bourke
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK.
| | - Mark J F Brown
- School of Biological Sciences, Royal Holloway University of London, London, UK.
| | - Severine D Buechel
- Experimental Ecology, Institute of Integrative Biology, Eidgenössiche Technische Hochschule (ETH) Zürich, CH-8092, Zürich, Switzerland.
| | - Rossanah Cameron
- Laboratory for Evolution and Development, Genetics Otago and the National Research Centre for Growth and Development, Department of Biochemistry, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand.
| | - Kaat Cappelle
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
| | - James C Carolan
- Maynooth University Department of Biology, Maynooth University, Co, Kildare, Ireland.
| | - Olivier Christiaens
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.
| | - Kate L Ciborowski
- School of Biological Sciences, University of Bristol, 24 Tyndall Avenue, Bristol, BS8 1TQ, UK.
| | | | - Thomas J Colgan
- Department of Zoology, School of Natural Sciences, Trinity College Dublin, Dublin, Ireland.
| | - David H Collins
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK.
| | - Andrew G Cridge
- Laboratory for Evolution and Development, Genetics Otago and the National Research Centre for Growth and Development, Department of Biochemistry, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand.
| | - Tamas Dalmay
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK.
| | - Stephanie Dreier
- Institute of Zoology, Zoological Society of London, Regent's Park, London, NW1 4RY, UK.
| | - Louis du Plessis
- Theoretical Biology, Institute of Integrative Biology, Eidgenössiche Technische Hochschule (ETH) Zürich, CH-8092, Zürich, Switzerland. .,Swiss Institute of Bioinformatics, Lausanne, Switzerland. .,Computational Evolution, Department of Biosystems Science and Engineering, ETH Zürich, Basel, Switzerland.
| | - Elizabeth Duncan
- Laboratory for Evolution and Development, Genetics Otago and the National Research Centre for Growth and Development, Department of Biochemistry, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand.
| | - Silvio Erler
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Wittenberg, Germany.
| | - Jay Evans
- USDA-ARS Bee Research Laboratory, Maryland, USA.
| | - Tiago Falcon
- Departamento de Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, 14040-900, Ribeirão Preto, Brazil.
| | - Kevin Flores
- Center for Research in Scientific Computation, North Carolina State University Raleigh, Raleigh, NC, USA.
| | - Flávia C P Freitas
- Departamento de Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, 14040-900, Ribeirão Preto, Brazil.
| | - Taro Fuchikawa
- Department of Ecology, Evolution, and Behavior, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel. .,Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan.
| | - Tanja Gempe
- Institute of Evolutionary Genetics, Heinrich Heine University Duesseldorf, Universitaetsstrasse 1, 40225, Duesseldorf, Germany.
| | - Klaus Hartfelder
- Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, 14040-900, Ribeirão Preto, Brazil.
| | - Frank Hauser
- Center for Functional and Comparative Insect Genomics, Department of Biology, University of Copenhagen, Copenhagen, Denmark.
| | - Sophie Helbing
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Wittenberg, Germany.
| | - Fernanda C Humann
- Instituto Federal de Educação, Ciência e Tecnologia de São Paulo, 15991-502, Matão, Brazil.
| | - Frano Irvine
- Laboratory for Evolution and Development, Genetics Otago and the National Research Centre for Growth and Development, Department of Biochemistry, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand.
| | | | - Claire E Johnson
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
| | - Reed M Johnson
- Department of Entomology, The Ohio State University, Wooster, OH, 44791, USA.
| | - Andrew K Jones
- Department of Biological and Medical Sciences, Faculty of Health and Life Sciences, Oxford Brookes University, Oxford, OX3 0BP, UK.
| | - Tatsuhiko Kadowaki
- Department of Biological Sciences, Xi'an Jiaotong-Liverpool University, Suzhou, China.
| | - Jonathan H Kidner
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Wittenberg, Germany.
| | - Vasco Koch
- Institute of Evolutionary Genetics, Heinrich Heine University Duesseldorf, Universitaetsstrasse 1, 40225, Duesseldorf, Germany.
| | - Arian Köhler
- Institute of Evolutionary Genetics, Heinrich Heine University Duesseldorf, Universitaetsstrasse 1, 40225, Duesseldorf, Germany.
| | - F Bernhard Kraus
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Wittenberg, Germany. .,Department of Laboratory Medicine, University Hospital Halle (Saale), Halle, Germany.
| | - H Michael G Lattorff
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Wittenberg, Germany. .,German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany.
| | - Megan Leask
- Laboratory for Evolution and Development, Genetics Otago and the National Research Centre for Growth and Development, Department of Biochemistry, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand.
| | | | - Eamonn B Mallon
- Department of Biology, University of Leicester, Leicester, UK.
| | - David S Marco Antonio
- Departamento de Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, 14040-900, Ribeirão Preto, Brazil.
| | - Monika Marxer
- Experimental Ecology, Institute of Integrative Biology, Eidgenössiche Technische Hochschule (ETH) Zürich, CH-8092, Zürich, Switzerland.
| | - Ivan Meeus
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.
| | - Robin F A Moritz
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Wittenberg, Germany.
| | - Ajay Nair
- Laboratory for Evolution and Development, Genetics Otago and the National Research Centre for Growth and Development, Department of Biochemistry, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand.
| | - Kathrin Näpflin
- Experimental Ecology, Institute of Integrative Biology, Eidgenössiche Technische Hochschule (ETH) Zürich, CH-8092, Zürich, Switzerland.
| | - Inga Nissen
- Institute of Evolutionary Genetics, Heinrich Heine University Duesseldorf, Universitaetsstrasse 1, 40225, Duesseldorf, Germany.
| | - Jinzhi Niu
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.
| | - Francis M F Nunes
- Departamento de Genética e Evolução, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos, 13565-905, São Carlos, Brazil.
| | | | - Amy Osborne
- Laboratory for Evolution and Development, Genetics Otago and the National Research Centre for Growth and Development, Department of Biochemistry, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand.
| | - Marianne Otte
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Wittenberg, Germany.
| | - Daniel G Pinheiro
- Departamento de Tecnologia, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, 14884-900, Jaboticabal, Brazil.
| | - Nina Rossié
- Institute of Evolutionary Genetics, Heinrich Heine University Duesseldorf, Universitaetsstrasse 1, 40225, Duesseldorf, Germany.
| | - Olav Rueppell
- Department of Biology, University of North Carolina at Greensboro, 321 McIver Street, Greensboro, NC, 27403, USA.
| | - Carolina G Santos
- Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, 14040-900, Ribeirão Preto, Brazil.
| | - Regula Schmid-Hempel
- Experimental Ecology, Institute of Integrative Biology, Eidgenössiche Technische Hochschule (ETH) Zürich, CH-8092, Zürich, Switzerland.
| | - Björn D Schmitt
- Institute of Evolutionary Genetics, Heinrich Heine University Duesseldorf, Universitaetsstrasse 1, 40225, Duesseldorf, Germany.
| | - Christina Schulte
- Institute of Evolutionary Genetics, Heinrich Heine University Duesseldorf, Universitaetsstrasse 1, 40225, Duesseldorf, Germany.
| | - Zilá L P Simões
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901, Ribeirão Preto, Brazil.
| | - Michelle P M Soares
- Departamento de Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, 14040-900, Ribeirão Preto, Brazil.
| | - Luc Swevers
- Institute of Biosciences & Applications, National Center for Scientific Research Demokritos, Athens, Greece.
| | | | - Florian Wolschin
- School of Life Sciences, Arizona State University, Tempe, AZ, 85287, USA. .,Department of Chemistry, Biotechnology and Food Science, Norwegian University of Food Science, N-1432, Aas, Norway.
| | - Na Yu
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.
| | - Evgeny M Zdobnov
- Department of Genetic Medicine and Development, University of Geneva Medical School, rue Michel-Servet 1, 1211, Geneva, Switzerland. .,Swiss Institute of Bioinformatics, rue Michel-Servet 1, 1211, Geneva, Switzerland.
| | - Peshtewani K Aqrawi
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Kerstin P Blankenburg
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Marcus Coyle
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Liezl Francisco
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Alvaro G Hernandez
- Roy J. Carver Biotechnology Center, University of Illinois Urbana-Champaign, Urbana, IL, USA.
| | - Michael Holder
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Matthew E Hudson
- Department of Crop Sciences and Institute of Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
| | - LaRonda Jackson
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Joy Jayaseelan
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Vandita Joshi
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Christie Kovar
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Sandra L Lee
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Robert Mata
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Tittu Mathew
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Irene F Newsham
- Molecular Genetic Technology Program, School of Health Professions, MD Anderson Cancer Center, 1515 Holcombe Blvd, Unit 2, Houston, TX, 77025, USA.
| | - Robin Ngo
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Geoffrey Okwuonu
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Christopher Pham
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Ling-Ling Pu
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Nehad Saada
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Jireh Santibanez
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - DeNard Simmons
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Rebecca Thornton
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Aarti Venkat
- Department of Human Genetics, University of Chicago, Chicago, IL, USA.
| | - Kimberly K O Walden
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
| | - Yuan-Qing Wu
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Griet Debyser
- Laboratory of Protein Biochemistry and Biomolecular Engineering, Department of Biochemistry and Microbiology, Ghent University, K.L. Ledeganckstraat 35, 9000, Ghent, Belgium.
| | - Bart Devreese
- Laboratory of Protein Biochemistry and Biomolecular Engineering, Department of Biochemistry and Microbiology, Ghent University, K.L. Ledeganckstraat 35, 9000, Ghent, Belgium.
| | - Claire Asher
- Institute of Zoology, Zoological Society of London, Regent's Park, London, NW1 4RY, UK.
| | - Julie Blommaert
- Laboratory for Evolution and Development, Genetics Otago and the National Research Centre for Growth and Development, Department of Biochemistry, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand.
| | - Ariel D Chipman
- Department of Ecology, Evolution, and Behavior, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel.
| | - Lars Chittka
- Department of Biological and Experimental Psychology, School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London, E1 4NS, UK.
| | - Bertrand Fouks
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Wittenberg, Germany. .,Department of Biology, University of North Carolina at Greensboro, 321 McIver Street, Greensboro, NC, 27403, USA.
| | - Jisheng Liu
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium. .,School of Life Sciences, Guangzhou University, Guangzhou, China.
| | - Meaghan P O'Neill
- Laboratory for Evolution and Development, Genetics Otago and the National Research Centre for Growth and Development, Department of Biochemistry, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand.
| | - Seirian Sumner
- School of Biological Sciences, University of Bristol, 24 Tyndall Avenue, Bristol, BS8 1TQ, UK.
| | - Daniela Puiu
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University, Baltimore, MD, 21205, USA.
| | - Jiaxin Qu
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Steven L Salzberg
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University, Baltimore, MD, 21205, USA.
| | - Steven E Scherer
- School of Life Sciences, Guangzhou University, Guangzhou, China.
| | - Donna M Muzny
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Stephen Richards
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Gene E Robinson
- Carl R. Woese Institute for Genomic Biology, Department of Entomology, Neuroscience Program, University of Illinois at Urbana-Champaign, 1206 West Gregory Drive, Urbana, IL, 61801, USA.
| | - Richard A Gibbs
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
| | - Paul Schmid-Hempel
- Experimental Ecology, Institute of Integrative Biology, Eidgenössiche Technische Hochschule (ETH) Zürich, CH-8092, Zürich, Switzerland.
| | - Kim C Worley
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, MS BCM226, One Baylor Plaza, Houston, TX, 77030, USA.
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Elliott TA, Gregory TR. Do larger genomes contain more diverse transposable elements? BMC Evol Biol 2015; 15:69. [PMID: 25896861 PMCID: PMC4438587 DOI: 10.1186/s12862-015-0339-8] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Accepted: 03/25/2015] [Indexed: 01/15/2023] Open
Abstract
Background The genomes of eukaryotes vary enormously in size, with much of this diversity driven by differences in the abundances of transposable elements (TEs). There is also substantial structural and phylogenetic diversity among TEs, such that they can be classified into distinct classes, superfamilies, and families. Possible relationships between TE diversity (and not just abundance) and genome size have not been investigated to date, though there are reasons to expect either a positive or a negative correlation. This study compares data from 257 species of animals, plants, fungi, and “protists” to determine whether TE diversity at the superfamily level is related to genome size. Results No simple relationship was found between TE diversity and genome size. There is no significant correlation across all eukaryotes, but there is a positive correlation for genomes below 500Mbp and a negative correlation among land plants. No relationships were found across animals or within vertebrates. Some TE superfamilies tend to be present across all major groups of eukaryotes, but there is considerable variance in TE diversity in different taxa. Conclusions Differences in genome size are thought to arise primarily through accumulation of TEs, but beyond a certain point (~500 Mbp), TE diversity does not increase with genome size. Several possible explanations for these complex patterns are discussed, and recommendations to facilitate future analyses are provided. Electronic supplementary material The online version of this article (doi:10.1186/s12862-015-0339-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Tyler A Elliott
- Department of Integrative Biology, University of Guelph, 50 Stone Road East, Guelph, Ontario, N1G 2W1, Canada.
| | - T Ryan Gregory
- Department of Integrative Biology, University of Guelph, 50 Stone Road East, Guelph, Ontario, N1G 2W1, Canada.
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135
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Abstract
ABSTRACT
The number and diversity of known prokaryotic insertion sequences (IS) have increased enormously since their discovery in the late 1960s. At present the sequences of more than 4000 different IS have been deposited in the specialized ISfinder database. Over time it has become increasingly apparent that they are important actors in the evolution of their host genomes and are involved in sequestering, transmitting, mutating and activating genes, and in the rearrangement of both plasmids and chromosomes. This review presents an overview of our current understanding of these transposable elements (TE), their organization and their transposition mechanism as well as their distribution and genomic impact. In spite of their diversity, they share only a very limited number of transposition mechanisms which we outline here. Prokaryotic IS are but one example of a variety of diverse TE which are being revealed due to the advent of extensive genome sequencing projects. A major conclusion from sequence comparisons of various TE is that frontiers between the different types are becoming less clear. We detail these receding frontiers between different IS-related TE. Several, more specialized chapters in this volume include additional detailed information concerning a number of these.
In a second section of the review, we provide a detailed description of the expanding variety of IS, which we have divided into families for convenience. Our perception of these families continues to evolve and families emerge regularly as more IS are identified. This section is designed as an aid and a source of information for consultation by interested specialist readers.
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136
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Majumdar S, Rio DC. P Transposable Elements in Drosophila and other Eukaryotic Organisms. Microbiol Spectr 2015; 3:MDNA3-0004-2014. [PMID: 26104714 PMCID: PMC4399808 DOI: 10.1128/microbiolspec.mdna3-0004-2014] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Indexed: 11/20/2022] Open
Abstract
P transposable elements were discovered in Drosophila as the causative agents of a syndrome of genetic traits called hybrid dysgenesis. Hybrid dysgenesis exhibits a unique pattern of maternal inheritance linked to the germline-specific small RNA piwi-interacting (piRNA) pathway. The use of P transposable elements as vectors for gene transfer and as genetic tools revolutionized the field of Drosophila molecular genetics. P element transposons have served as a useful model to investigate mechanisms of cut-and-paste transposition in eukaryotes. Biochemical studies have revealed new and unexpected insights into how eukaryotic DNA-based transposons are mobilized. For example, the P element transposase makes unusual 17nt-3' extended double-strand DNA breaks at the transposon termini and uses guanosine triphosphate (GTP) as a cofactor to promote synapsis of the two transposon ends early in the transposition pathway. The N-terminal DNA binding domain of the P element transposase, called a THAP domain, contains a C2CH zinc-coordinating motif and is the founding member of a large family of animal-specific site-specific DNA binding proteins. Over the past decade genome sequencing efforts have revealed the presence of P element-like transposable elements or P element transposase-like genes (called THAP9) in many eukaryotic genomes, including vertebrates, such as primates including humans, zebrafish and Xenopus, as well as the human parasite Trichomonas vaginalis, the sea squirt Ciona, sea urchin and hydra. Surprisingly, the human and zebrafish P element transposase-related THAP9 genes promote transposition of the Drosophila P element transposon DNA in human and Drosophila cells, indicating that the THAP9 genes encode active P element "transposase" proteins.
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Affiliation(s)
| | - Donald C. Rio
- Department of Molecular and Cell Biology University of California, Berkeley Berkeley, CA 94720-3204
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137
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Abstract
DNA transposases use a limited repertoire of structurally and mechanistically distinct nuclease domains to catalyze the DNA strand breaking and rejoining reactions that comprise DNA transposition. Here, we review the mechanisms of the four known types of transposition reactions catalyzed by (1) RNase H-like transposases (also known as DD(E/D) enzymes); (2) HUH single-stranded DNA transposases; (3) serine transposases; and (4) tyrosine transposases. The large body of accumulated biochemical and structural data, particularly for the RNase H-like transposases, has revealed not only the distinguishing features of each transposon family, but also some emerging themes that appear conserved across all families. The more-recently characterized single-stranded DNA transposases provide insight into how an ancient HUH domain fold has been adapted for transposition to accomplish excision and then site-specific integration. The serine and tyrosine transposases are structurally and mechanistically related to their cousins, the serine and tyrosine site-specific recombinases, but have to date been less intensively studied. These types of enzymes are particularly intriguing as in the context of site-specific recombination they require strict homology between recombining sites, yet for transposition can catalyze the joining of transposon ends to form an excised circle and then integration into a genomic site with much relaxed sequence specificity.
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Affiliation(s)
- Alison B Hickman
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, 5 Center Dr., Bethesda, MD 20892, USA
| | - Fred Dyda
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, 5 Center Dr., Bethesda, MD 20892, USA
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Piégu B, Bire S, Arensburger P, Bigot Y. A survey of transposable element classification systems--a call for a fundamental update to meet the challenge of their diversity and complexity. Mol Phylogenet Evol 2015; 86:90-109. [PMID: 25797922 DOI: 10.1016/j.ympev.2015.03.009] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2014] [Revised: 03/11/2015] [Accepted: 03/12/2015] [Indexed: 10/25/2022]
Abstract
The increase of publicly available sequencing data has allowed for rapid progress in our understanding of genome composition. As new information becomes available we should constantly be updating and reanalyzing existing and newly acquired data. In this report we focus on transposable elements (TEs) which make up a significant portion of nearly all sequenced genomes. Our ability to accurately identify and classify these sequences is critical to understanding their impact on host genomes. At the same time, as we demonstrate in this report, problems with existing classification schemes have led to significant misunderstandings of the evolution of both TE sequences and their host genomes. In a pioneering publication Finnegan (1989) proposed classifying all TE sequences into two classes based on transposition mechanisms and structural features: the retrotransposons (class I) and the DNA transposons (class II). We have retraced how ideas regarding TE classification and annotation in both prokaryotic and eukaryotic scientific communities have changed over time. This has led us to observe that: (1) a number of TEs have convergent structural features and/or transposition mechanisms that have led to misleading conclusions regarding their classification, (2) the evolution of TEs is similar to that of viruses by having several unrelated origins, (3) there might be at least 8 classes and 12 orders of TEs including 10 novel orders. In an effort to address these classification issues we propose: (1) the outline of a universal TE classification, (2) a set of methods and classification rules that could be used by all scientific communities involved in the study of TEs, and (3) a 5-year schedule for the establishment of an International Committee for Taxonomy of Transposable Elements (ICTTE).
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Affiliation(s)
- Benoît Piégu
- UMR INRA-CNRS 7247, PRC, Centre INRA de Nouzilly, 37380 Nouzilly, France
| | - Solenne Bire
- UMR INRA-CNRS 7247, PRC, Centre INRA de Nouzilly, 37380 Nouzilly, France; Institute of Biotechnology, University of Lausanne, Center for Biotechnology UNIL-EPFL, 1015 Lausanne, Switzerland
| | - Peter Arensburger
- UMR INRA-CNRS 7247, PRC, Centre INRA de Nouzilly, 37380 Nouzilly, France; Biological Sciences Department, California State Polytechnic University, Pomona, CA 91768, United States.
| | - Yves Bigot
- UMR INRA-CNRS 7247, PRC, Centre INRA de Nouzilly, 37380 Nouzilly, France.
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139
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Ma B, Li T, Xiang Z, He N. MnTEdb, a collective resource for mulberry transposable elements. DATABASE-THE JOURNAL OF BIOLOGICAL DATABASES AND CURATION 2015; 2015:bav004. [PMID: 25725060 PMCID: PMC4343074 DOI: 10.1093/database/bav004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Mulberry has been used as an economically important food crop for the domesticated silkworm for thousands of years, resulting in one of the oldest and well-known plant-herbivore interactions. The genome of Morus notabilis has now been sequenced and there is an opportunity to mine the transposable element (TE) data. To better understand the roles of TEs in structural, functional and evolutionary dynamics of the mulberry genome, a specific, comprehensive and user-friendly web-based database, MnTEdb, was constructed. It was built based on a detailed and accurate identification of all TEs in mulberry. A total of 5925 TEs belonging to 13 superfamilies and 1062 families were deposited in this database. MnTEdb enables users to search, browse and download the mulberry TE sequences. Meanwhile, data mining tools, including BLAST, GetORF, HMMER, Sequence Extractor and JBrowse were also integrated into MnTEdb. MnTEdb will assist researchers to efficiently take advantage of our newly annotated TEs, which facilitate their studies in the origin, amplification and evolution of TEs, as well as the comparative analysis among the different species. Database URL:http://morus.swu.edu.cn/mntedb/
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Affiliation(s)
- Bi Ma
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China
| | - Tian Li
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China
| | - Zhonghuai Xiang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China
| | - Ningjia He
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China
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140
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Engelman A, Cherepanov P. Retroviral Integrase Structure and DNA Recombination Mechanism. Microbiol Spectr 2015; 2:1-22. [PMID: 25705574 PMCID: PMC4334468 DOI: 10.1128/microbiolspec.mdna3-0024-2014] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Indexed: 12/13/2022] Open
Abstract
Due to the importance of human immunodeficiency virus type 1 (HIV-1) integrase as a drug target, the biochemistry and structural aspects of retroviral DNA integration have been the focus of intensive research during the past three decades. The retroviral integrase enzyme acts on the linear double-stranded viral DNA product of reverse transcription. Integrase cleaves specific phosphodiester bonds near the viral DNA ends during the 3' processing reaction. The enzyme then uses the resulting viral DNA 3'-OH groups during strand transfer to cut chromosomal target DNA, which simultaneously joins both viral DNA ends to target DNA 5'-phosphates. Both reactions proceed via direct transesterification of scissile phosphodiester bonds by attacking nucleophiles: a water molecule for 3' processing, and the viral DNA 3'-OH for strand transfer. X-ray crystal structures of prototype foamy virus integrase-DNA complexes revealed the architectures of the key nucleoprotein complexes that form sequentially during the integration process and explained the roles of active site metal ions in catalysis. X-ray crystallography furthermore elucidated the mechanism of action of HIV-1 integrase strand transfer inhibitors, which are currently used to treat AIDS patients, and provided valuable insights into the mechanisms of viral drug resistance.
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Affiliation(s)
- Alan Engelman
- Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, 450 Brookline, Avenue, CLS-1010, Boston, MA 02215
| | - Peter Cherepanov
- Cancer Research UK London Research Institute, Clare Hall Laboratories, Blanche Lane, Potters Bar, EN6 3LD, United Kingdom
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141
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Guérillot R, Siguier P, Gourbeyre E, Chandler M, Glaser P. The diversity of prokaryotic DDE transposases of the mutator superfamily, insertion specificity, and association with conjugation machineries. Genome Biol Evol 2015; 6:260-72. [PMID: 24418649 PMCID: PMC3942029 DOI: 10.1093/gbe/evu010] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Transposable elements (TEs) are major components of both prokaryotic and eukaryotic genomes and play a significant role in their evolution. In this study, we have identified new prokaryotic DDE transposase families related to the eukaryotic Mutator-like transposases. These genes were retrieved by cascade PSI-Blast using as initial query the transposase of the streptococcal integrative and conjugative element (ICE) TnGBS2. By combining secondary structure predictions and protein sequence alignments, we predicted the DDE catalytic triad and the DNA-binding domain recognizing the terminal inverted repeats. Furthermore, we systematically characterized the organization and the insertion specificity of the TEs relying on these prokaryotic Mutator-like transposases (p-MULT) for their mobility. Strikingly, two distant TE families target their integration upstream σA dependent promoters. This allowed us to identify a transposase sequence signature associated with this unique insertion specificity and to show that the dissymmetry between the two inverted repeats is responsible for the orientation of the insertion. Surprisingly, while DDE transposases are generally associated with small and simple transposons such as insertion sequences (ISs), p-MULT encoding TEs show an unprecedented diversity with several families of IS, transposons, and ICEs ranging in size from 1.1 to 52 kb.
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Affiliation(s)
- Romain Guérillot
- Unité de Biologie des Bactéries pathogènes à Gram-positif, Institut Pasteur, Paris, France
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142
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Hickman AB, Ewis HE, Li X, Knapp JA, Laver T, Doss AL, Tolun G, Steven AC, Grishaev A, Bax A, Atkinson PW, Craig NL, Dyda F. Structural basis of hAT transposon end recognition by Hermes, an octameric DNA transposase from Musca domestica. Cell 2014; 158:353-367. [PMID: 25036632 DOI: 10.1016/j.cell.2014.05.037] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 04/10/2014] [Accepted: 05/12/2014] [Indexed: 11/25/2022]
Abstract
Hermes is a member of the hAT transposon superfamily that has active representatives, including McClintock's archetypal Ac mobile genetic element, in many eukaryotic species. The crystal structure of the Hermes transposase-DNA complex reveals that Hermes forms an octameric ring organized as a tetramer of dimers. Although isolated dimers are active in vitro for all the chemical steps of transposition, only octamers are active in vivo. The octamer can provide not only multiple specific DNA-binding domains to recognize repeated subterminal sequences within the transposon ends, which are important for activity, but also multiple nonspecific DNA binding surfaces for target capture. The unusual assembly explains the basis of bipartite DNA recognition at hAT transposon ends, provides a rationale for transposon end asymmetry, and suggests how the avidity provided by multiple sites of interaction could allow a transposase to locate its transposon ends amidst a sea of chromosomal DNA.
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Affiliation(s)
- Alison B Hickman
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Hosam E Ewis
- Howard Hughes Medical Institute, Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Xianghong Li
- Howard Hughes Medical Institute, Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Joshua A Knapp
- Graduate Program in Biochemistry and Molecular Biology, University of California Riverside, Riverside, CA 92521, USA
| | - Thomas Laver
- Graduate Program in Genetics, Genomics, and Bioinformatics, University of California Riverside, Riverside, CA 92521, USA
| | - Anna-Louise Doss
- Graduate Program in Cell, Molecular, and Developmental Biology, University of California Riverside, Riverside, CA 92521, USA
| | - Gökhan Tolun
- Laboratory of Structural Biology Research, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Alasdair C Steven
- Laboratory of Structural Biology Research, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Alexander Grishaev
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Ad Bax
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Peter W Atkinson
- Graduate Program in Biochemistry and Molecular Biology, University of California Riverside, Riverside, CA 92521, USA; Graduate Program in Genetics, Genomics, and Bioinformatics, University of California Riverside, Riverside, CA 92521, USA; Graduate Program in Cell, Molecular, and Developmental Biology, University of California Riverside, Riverside, CA 92521, USA; Department of Entomology and Institute for Integrative Genome Biology, University of California Riverside, Riverside, CA 92521, USA
| | - Nancy L Craig
- Howard Hughes Medical Institute, Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Fred Dyda
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
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143
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Gonçalves JW, Valiati VH, Delprat A, Valente VLS, Ruiz A. Structural and sequence diversity of the transposon Galileo in the Drosophila willistoni genome. BMC Genomics 2014; 15:792. [PMID: 25218200 PMCID: PMC4168063 DOI: 10.1186/1471-2164-15-792] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2014] [Accepted: 09/09/2014] [Indexed: 01/07/2023] Open
Abstract
Background Galileo is one of three members of the P superfamily of DNA transposons. It was originally discovered in Drosophila buzzatii, in which three segregating chromosomal inversions were shown to have been generated by ectopic recombination between Galileo copies. Subsequently, Galileo was identified in six of 12 sequenced Drosophila genomes, indicating its widespread distribution within this genus. Galileo is strikingly abundant in Drosophila willistoni, a neotropical species that is highly polymorphic for chromosomal inversions, suggesting a role for this transposon in the evolution of its genome. Results We carried out a detailed characterization of all Galileo copies present in the D. willistoni genome. A total of 191 copies, including 133 with two terminal inverted repeats (TIRs), were classified according to structure in six groups. The TIRs exhibited remarkable variation in their length and structure compared to the most complete copy. Three copies showed extended TIRs due to internal tandem repeats, the insertion of other transposable elements (TEs), or the incorporation of non-TIR sequences into the TIRs. Phylogenetic analyses of the transposase (TPase)-encoding and TIR segments yielded two divergent clades, which we termed Galileo subfamilies V and W. Target-site duplications (TSDs) in D. willistoni Galileo copies were 7- or 8-bp in length, with the consensus sequence GTATTAC. Analysis of the region around the TSDs revealed a target site motif (TSM) with a 15-bp palindrome that may give rise to a stem-loop secondary structure. Conclusions There is a remarkable abundance and diversity of Galileo copies in the D. willistoni genome, although no functional copies were found. The TIRs in particular have a dynamic structure and extend in different ways, but their ends (required for transposition) are more conserved than the rest of the element. The D. willistoni genome harbors two Galileo subfamilies (V and W) that diverged ~9 million years ago and may have descended from an ancestral element in the genome. Galileo shows a significant insertion preference for a 15-bp palindromic TSM. Electronic supplementary material The online version of this article (doi:10.1186/1471-2164-15-792) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | | | | | - Vera L S Valente
- Programa de Pós-Graduação em Genética e Biologia Molecular, Departamento de Genética, Universidade Federal do Rio Grande do Sul (UFRGS), CP 15053, Porto Alegre, Rio Grande do Sul 91501-970, Brazil.
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144
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Buchmann JP, Löytynoja A, Wicker T, Schulman AH. Analysis of CACTA transposases reveals intron loss as major factor influencing their exon/intron structure in monocotyledonous and eudicotyledonous hosts. Mob DNA 2014; 5:24. [PMID: 25206928 PMCID: PMC4158355 DOI: 10.1186/1759-8753-5-24] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 08/18/2014] [Indexed: 01/20/2023] Open
Abstract
Background CACTA elements are DNA transposons and are found in numerous organisms. Despite their low activity, several thousand copies can be identified in many genomes. CACTA elements transpose using a ‘cut-and-paste’ mechanism, which is facilitated by a DDE transposase. DDE transposases from CACTA elements contain, despite their conserved function, different exon numbers among various CACTA families. While earlier studies analyzed the ancestral history of the DDE transposases, no studies have examined exon loss and gain with a view of mechanisms that could drive the changes. Results We analyzed 64 transposases from different CACTA families among monocotyledonous and eudicotyledonous host species. The annotation of the exon/intron boundaries showed a range from one to six exons. A robust multiple sequence alignment of the 64 transposases based on their protein sequences was created and used for phylogenetic analysis, which revealed eight different clades. We observed that the exon numbers in CACTA transposases are not specific for a host genome. We found that ancient CACTA lineages diverged before the divergence of monocotyledons and eudicotyledons. Most exon/intron boundaries were found in three distinct regions among all the transposases, grouping 63 conserved intron/exon boundaries. Conclusions We propose a model for the ancestral CACTA transposase gene, which consists of four exons, that predates the divergence of the monocotyledons and eudicotyledons. Based on this model, we propose pathways of intron loss or gain to explain the observed variation in exon numbers. While intron loss appears to have prevailed, a putative case of intron gain was nevertheless observed.
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Affiliation(s)
- Jan P Buchmann
- Institute of Biotechnology, Viikki Biocenter, University of Helsinki, PO Box 65, FIN-00014 Helsinki, Finland ; Present address: Marie Bashir Institute for Infectious Diseases and Biosecurity, Charles Perkins Center, University of Sydney, Sydney NSW 2006, Australia
| | - Ari Löytynoja
- Institute of Biotechnology, Viikki Biocenter, University of Helsinki, PO Box 65, FIN-00014 Helsinki, Finland
| | - Thomas Wicker
- Institute of Plant Biology, University of Zurich, Zollikerstrasse 107, Zurich, Switzerland
| | - Alan H Schulman
- Institute of Biotechnology, Viikki Biocenter, University of Helsinki, PO Box 65, FIN-00014 Helsinki, Finland ; Biotechnology and Food Research, MTT Agrifood Research Finland, Myllytie 1, FIN-31600 Jokioinen, Finland
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145
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Hickman AB, Dyda F. CRISPR-Cas immunity and mobile DNA: a new superfamily of DNA transposons encoding a Cas1 endonuclease. Mob DNA 2014; 5:23. [PMID: 25180049 PMCID: PMC4150552 DOI: 10.1186/1759-8753-5-23] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Accepted: 08/11/2014] [Indexed: 12/22/2022] Open
Abstract
Mobile genetic elements such as DNA transposons are a feature of most genomes. The existence of novel DNA transposons can be inferred when whole genome sequencing reveals the presence of hallmarks of mobile elements such as terminal inverted repeats (TIRs) flanked by target site duplications (TSDs). A recent report describes a new superfamily of DNA transposons in the genomes of a few bacteria and archaea that possess TIRs and TSDs, and encode several conserved genes including a cas1 endonuclease gene, previously associated only with CRISPR-Cas adaptive immune systems. The data strongly suggests that these elements, designated ‘casposons’, are likely to be bona fide DNA transposons and that their Cas1 nucleases act as transposases and are possibly still active.
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Affiliation(s)
- Alison B Hickman
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Fred Dyda
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
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146
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Palazzo A, Moschetti R, Caizzi R, Marsano RM. The Drosophila mojavensis Bari3 transposon: distribution and functional characterization. Mob DNA 2014; 5:21. [PMID: 25093043 PMCID: PMC4120734 DOI: 10.1186/1759-8753-5-21] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 06/13/2014] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND Bari-like transposons belong to the Tc1-mariner superfamily, and they have been identified in several genomes of the Drosophila genus. This transposon's family has been used as paradigm to investigate the complex dynamics underlying the persistence and structural evolution of transposable elements (TEs) within a genome. Three structural Bari variants have been identified so far and can be distinguished based on the organization of their terminal inverted repeats. Bari3 is the last discovered member of this family identified in Drosophila mojavensis, a recently emerged species of the Repleta group of the genus Drosophila. RESULTS We studied the insertion pattern of Bari3 in different D. mojavensis populations and found evidence of recent transposition activity. Analysis of the transposase domains unveiled the presence of a functional nuclear localization signal, as well as a functional binding domain. Using luciferase-based assays, we investigated the promoter activity of Bari3 as well as the interaction of its transposase with its left terminus. The results suggest that Bari3 is transposition-competent. Finally we demonstrated transposase transcript processing when the transposase gene is overexpressed in vivo and in vitro. CONCLUSIONS Bari3 displays very similar structural and functional features with its close relative, Bari1. Our results strongly suggest that Bari3 is an independent element that has generated genomic diversity in D. mojavensis. It can autonomously transcribe its transposase gene, which in turn can localize in the nucleus and bind the terminal inverted repeats of the transposon. Nevertheless, the identification of an unpredicted spliced form of the Bari3 transposase transcript allows us to hypothesize a control mechanism of its mobility based on mRNA processing. These results will aid the studies on the Bari family of transposons, which is intriguing for its widespread diffusion in Drosophilids coupled with a structural diversity generated during the evolution of Bari-like elements in their host genomes.
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Affiliation(s)
- Antonio Palazzo
- Dipartimento di Biologia, Università degli Studi di Bari "Aldo Moro", Via Orabona 4, 70125 Bari, Italy
| | - Roberta Moschetti
- Dipartimento di Biologia, Università degli Studi di Bari "Aldo Moro", Via Orabona 4, 70125 Bari, Italy
| | - Ruggiero Caizzi
- Dipartimento di Biologia, Università degli Studi di Bari "Aldo Moro", Via Orabona 4, 70125 Bari, Italy
| | - René Massimiliano Marsano
- Dipartimento di Biologia, Università degli Studi di Bari "Aldo Moro", Via Orabona 4, 70125 Bari, Italy
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147
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Han MJ, Xu HE, Zhang HH, Feschotte C, Zhang Z. Spy: a new group of eukaryotic DNA transposons without target site duplications. Genome Biol Evol 2014; 6:1748-57. [PMID: 24966181 PMCID: PMC4122938 DOI: 10.1093/gbe/evu140] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Class 2 or DNA transposons populate the genomes of most eukaryotes and like other mobile genetic elements have a profound impact on genome evolution. Most DNA transposons belong to the cut-and-paste types, which are relatively simple elements characterized by terminal-inverted repeats (TIRs) flanking a single gene encoding a transposase. All eukaryotic cut-and-paste transposons so far described are also characterized by target site duplications (TSDs) of host DNA generated upon chromosomal insertion. Here, we report a new group of evolutionarily related DNA transposons called Spy, which also include TIRs and DDE motif-containing transposase but surprisingly do not create TSDs upon insertion. Instead, Spy transposons appear to transpose precisely between 5'-AAA and TTT-3' host nucleotides, without duplication or modification of the AAATTT target sites. Spy transposons were identified in the genomes of diverse invertebrate species based on transposase homology searches and structure-based approaches. Phylogenetic analyses indicate that Spy transposases are distantly related to IS5, ISL2EU, and PIF/Harbinger transposases. However, Spy transposons are distinct from these and other DNA transposon superfamilies by their lack of TSD and their target site preference. Our findings expand the known diversity of DNA transposons and reveal a new group of eukaryotic DDE transposases with unusual catalytic properties.
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Affiliation(s)
- Min-Jin Han
- School of Life Sciences, Chongqing University, China
| | - Hong-En Xu
- Department of Genome Oriented Bioinformatics, Wissenschaftszentrum Weihenstephan, TU Muenchen, Freising, Germany
| | - Hua-Hao Zhang
- School of Life Sciences, Chongqing University, ChinaCollege of Pharmacy and Life Science, Jiujiang University, China
| | - Cédric Feschotte
- Department of Human Genetics, University of Utah School of Medicine
| | - Ze Zhang
- School of Life Sciences, Chongqing University, China
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148
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Liu Y, Yang G. Tc1-like transposable elements in plant genomes. Mob DNA 2014; 5:17. [PMID: 24926322 PMCID: PMC4054914 DOI: 10.1186/1759-8753-5-17] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Accepted: 05/12/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The Tc1/mariner superfamily of transposable elements (TEs) is widespread in animal genomes. Mariner-like elements, which bear a DDD triad catalytic motif, have been identified in a wide range of flowering plant species. However, as the founding member of the superfamily, Tc1-like elements that bear a DD34E triad catalytic motif are only known to unikonts (animals, fungi, and Entamoeba). RESULTS Here we report the identification of Tc1-like elements (TLEs) in plant genomes. These elements bear the four terminal nucleotides and the characteristic DD34E triad motif of Tc1 element. The two TLE families (PpTc1, PpTc2) identified in the moss (Physcomitrella patens) genome contain highly similar copies. Multiple copies of PpTc1 are actively transcribed and the transcripts encode intact full length transposase coding sequences. TLEs are also found in angiosperm genome sequence databases of rice (Oryza sativa), dwarf birch (Betula nana), cabbage (Brassica rapa), hemp (Cannabis sativa), barley (Hordium valgare), lettuce (Lactuta sativa), poplar (Populus trichocarpa), pear (Pyrus x bretschneideri), and wheat (Triticum urartu). CONCLUSIONS This study extends the occurrence of TLEs to the plant phylum. The elements in the moss genome have amplified recently and may still be capable of transposition. The TLEs are also present in angiosperm genomes, but apparently much less abundant than in moss.
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Affiliation(s)
- Yuan Liu
- Department of Biology, University of Toronto at Mississauga, 3359 Mississauga Road, L5L 1C6 Mississauga, ON, Canada ; Cell and Systems Biology, University of Toronto, Toronto, Canada
| | - Guojun Yang
- Department of Biology, University of Toronto at Mississauga, 3359 Mississauga Road, L5L 1C6 Mississauga, ON, Canada ; Cell and Systems Biology, University of Toronto, Toronto, Canada
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149
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Zhang HH, Feschotte C, Han MJ, Zhang Z. Recurrent horizontal transfers of Chapaev transposons in diverse invertebrate and vertebrate animals. Genome Biol Evol 2014; 6:1375-86. [PMID: 24868016 PMCID: PMC4079192 DOI: 10.1093/gbe/evu112] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/21/2014] [Indexed: 01/08/2023] Open
Abstract
Horizontal transfer (HT) of a transposable element (TE) into a new genome is regarded as an important force to drive genome variation and biological innovation. In addition, HT also plays an important role in the persistence of TEs in eukaryotic genomes. Here, we provide the first documented example for the repeated HT of three families of Chapaev transposons in a wide range of animal species, including mammals, reptiles, jawed fishes, lampreys, insects, and in an insect bracovirus. Multiple alignments of the Chapaev transposons identified in these species revealed extremely high levels of nucleotide sequence identity (79-99%), which are inconsistent with vertical evolution given the deep divergence time separating these host species. Rather, the discontinuous distribution amongst species and lack of purifying selection acting on these transposons strongly suggest that they were independently and horizontally transferred into these species lineages. The detection of Chapaev transposons in an insect bracovirus indicated that these viruses might act as a possible vector for the horizontal spread of Chapaev transposons. One of the Chapaev families was also shared by lampreys and some of their common hosts (such as sturgeon and paddlefish), which suggested that parasite-host interaction might facilitate HTs.
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Affiliation(s)
- Hua-Hao Zhang
- School of Life Sciences, Chongqing University, ChinaCollege of Pharmacy and Life Science, Jiujiang University, China
| | - Cédric Feschotte
- Department of Human Genetics, University of Utah School of Medicine
| | - Min-Jin Han
- School of Life Sciences, Chongqing University, China
| | - Ze Zhang
- School of Life Sciences, Chongqing University, China
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Dias GB, Svartman M, Delprat A, Ruiz A, Kuhn GCS. Tetris is a foldback transposon that provided the building blocks for an emerging satellite DNA of Drosophila virilis. Genome Biol Evol 2014; 6:1302-13. [PMID: 24858539 PMCID: PMC4079207 DOI: 10.1093/gbe/evu108] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Transposable elements (TEs) and satellite DNAs (satDNAs) are abundant components of most eukaryotic genomes studied so far and their impact on evolution has been the focus of several studies. A number of studies linked TEs with satDNAs, but the nature of their evolutionary relationships remains unclear. During in silico analyses of the Drosophila virilis assembled genome, we found a novel DNA transposon we named Tetris based on its modular structure and diversity of rearranged forms. We aimed to characterize Tetris and investigate its role in generating satDNAs. Data mining and sequence analysis showed that Tetris is apparently nonautonomous, with a structure similar to foldback elements, and present in D. virilis and D. americana. Herein, we show that Tetris shares the final portions of its terminal inverted repeats (TIRs) with DAIBAM, a previously described miniature inverted transposable element implicated in the generation of chromosome inversions. Both elements are likely to be mobilized by the same autonomous TE. Tetris TIRs contain approximately 220-bp internal tandem repeats that we have named TIR-220. We also found TIR-220 repeats making up longer (kb-size) satDNA-like arrays. Using bioinformatic, phylogenetic and cytogenomic tools, we demonstrated that Tetris has contributed to shaping the genomes of D. virilis and D. americana, providing internal tandem repeats that served as building blocks for the amplification of satDNA arrays. The β-heterochromatic genomic environment seemed to have favored such amplification. Our results imply for the first time a role for foldback elements in generating satDNAs.
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Affiliation(s)
- Guilherme B Dias
- Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Marta Svartman
- Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Alejandra Delprat
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, Catalunya, Spain
| | - Alfredo Ruiz
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, Catalunya, Spain
| | - Gustavo C S Kuhn
- Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
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