1
|
Han H, Li X, Li T, Chen Q, Zhao J, Zhai H, Deng L, Meng X, Li C. Chromosome-level genome assembly of Solanum pimpinellifolium. Sci Data 2024; 11:577. [PMID: 38834611 DOI: 10.1038/s41597-024-03442-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Accepted: 05/29/2024] [Indexed: 06/06/2024] Open
Abstract
Solanum pimpinellifolium, the closest wild relative of the domesticated tomato, has high potential for use in breeding programs aimed at developing multi-pathogen resistance and quality improvement. We generated a chromosome-level genome assembly of S. pimpinellifolium LA1589, with a size of 833 Mb and a contig N50 of 31 Mb. We anchored 98.80% of the contigs into 12 pseudo-chromosomes, and identified 74.47% of the sequences as repetitive sequences. The genome evaluation revealed BUSCO and LAI score of 98.3% and 14.49, respectively, indicating high quality of this assembly. A total of 41,449 protein-coding genes were predicted in the genome, of which 89.17% were functionally annotated. This high-quality genome assembly serves as a valuable resource for accelerating the biological discovery and molecular breeding of this important horticultural crop.
Collapse
Affiliation(s)
- Hongyu Han
- College of Agronomy, Shandong Agricultural University, Tai'an, 271018, China
- Taishan Academy of Tomato Innovation, Shandong Agricultural University, Tai'an, 271018, China
| | - Xiuhong Li
- College of Agronomy, Shandong Agricultural University, Tai'an, 271018, China
| | - Tianze Li
- College of Agronomy, Shandong Agricultural University, Tai'an, 271018, China
| | - Qian Chen
- Taishan Academy of Tomato Innovation, Shandong Agricultural University, Tai'an, 271018, China
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, 271018, China
| | - Jiuhai Zhao
- College of Agronomy, Shandong Agricultural University, Tai'an, 271018, China
- State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China
- Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China
| | - Huawei Zhai
- Taishan Academy of Tomato Innovation, Shandong Agricultural University, Tai'an, 271018, China
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, 271018, China
| | - Lei Deng
- Taishan Academy of Tomato Innovation, Shandong Agricultural University, Tai'an, 271018, China
- College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China
| | - Xianwen Meng
- Taishan Academy of Tomato Innovation, Shandong Agricultural University, Tai'an, 271018, China.
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, 271018, China.
| | - Chuanyou Li
- Taishan Academy of Tomato Innovation, Shandong Agricultural University, Tai'an, 271018, China.
- College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China.
| |
Collapse
|
2
|
Marczuk-Rojas JP, Salmerón A, Alcayde A, Isanbaev V, Carretero-Paulet L. Plastid DNA is a major source of nuclear genome complexity and of RNA genes in the orphan crop moringa. BMC PLANT BIOLOGY 2024; 24:437. [PMID: 38773387 PMCID: PMC11110229 DOI: 10.1186/s12870-024-05158-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Accepted: 05/16/2024] [Indexed: 05/23/2024]
Abstract
BACKGROUND Unlike Transposable Elements (TEs) and gene/genome duplication, the role of the so-called nuclear plastid DNA sequences (NUPTs) in shaping the evolution of genome architecture and function remains poorly studied. We investigate here the functional and evolutionary fate of NUPTs in the orphan crop Moringa oleifera (moringa), featured by the highest fraction of plastid DNA found so far in any plant genome, focusing on (i) any potential biases in their distribution in relation to specific nuclear genomic features, (ii) their contribution to the emergence of new genes and gene regions, and (iii) their impact on the expression of target nuclear genes. RESULTS In agreement with their potential mutagenic effect, NUPTs are underrepresented among structural genes, although their overall transcription levels and broadness were only lower when involved exonic regions; the occurrence of plastid DNA generally did not result in a broader expression, except among those affected in introns by older NUPTs. In contrast, we found a strong enrichment of NUPTs among specific superfamilies of retrotransposons and several classes of RNA genes, including those participating in the protein biosynthetic machinery (i.e., rRNA and tRNA genes) and a specific class of regulatory RNAs. A significant fraction of NUPT RNA genes was found to be functionally expressed, thus potentially contributing to the nuclear pool. CONCLUSIONS Our results complete our view of the molecular factors driving the evolution of nuclear genome architecture and function, and support plastid DNA in moringa as a major source of (i) genome complexity and (ii) the nuclear pool of RNA genes.
Collapse
Affiliation(s)
- Juan Pablo Marczuk-Rojas
- Department of Biology and Geology, University of Almería, Ctra. Sacramento s/n, Almería, 04120, Spain
- "Pabellón de Historia Natural-Centro de Investigación de Colecciones Científicas de la Universidad de Almería" (PHN-CECOUAL), University of Almería, Ctra. Sacramento s/n, Almería, 04120, Spain
| | - Antonio Salmerón
- Department of Mathematics and Center for the Development and Transfer of Mathematical Research to Industry (CDTIME), University of Almería, Ctra. Sacramento s/n, Almería, 04120, Spain
| | - Alfredo Alcayde
- Department of Engineering, University of Almería, Ctra. Sacramento s/n, Almería, 04120, Spain
| | - Viktor Isanbaev
- Department of Engineering, University of Almería, Ctra. Sacramento s/n, Almería, 04120, Spain
| | - Lorenzo Carretero-Paulet
- Department of Biology and Geology, University of Almería, Ctra. Sacramento s/n, Almería, 04120, Spain.
- "Pabellón de Historia Natural-Centro de Investigación de Colecciones Científicas de la Universidad de Almería" (PHN-CECOUAL), University of Almería, Ctra. Sacramento s/n, Almería, 04120, Spain.
| |
Collapse
|
3
|
Plessy C, Mansfield MJ, Bliznina A, Masunaga A, West C, Tan Y, Liu AW, Grašič J, Del Río Pisula MS, Sánchez-Serna G, Fabrega-Torrus M, Ferrández-Roldán A, Roncalli V, Navratilova P, Thompson EM, Onuma T, Nishida H, Cañestro C, Luscombe NM. Extreme genome scrambling in marine planktonic Oikopleura dioica cryptic species. Genome Res 2024; 34:426-440. [PMID: 38621828 PMCID: PMC11067885 DOI: 10.1101/gr.278295.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 02/28/2024] [Indexed: 04/17/2024]
Abstract
Genome structural variations within species are rare. How selective constraints preserve gene order and chromosome structure is a central question in evolutionary biology that remains unsolved. Our sequencing of several genomes of the appendicularian tunicate Oikopleura dioica around the globe reveals extreme genome scrambling caused by thousands of chromosomal rearrangements, although showing no obvious morphological differences between these animals. The breakpoint accumulation rate is an order of magnitude higher than in ascidian tunicates, nematodes, Drosophila, or mammals. Chromosome arms and sex-specific regions appear to be the primary unit of macrosynteny conservation. At the microsyntenic level, scrambling did not preserve operon structures, suggesting an absence of selective pressure to maintain them. The uncoupling of the genome scrambling with morphological conservation in O. dioica suggests the presence of previously unnoticed cryptic species and provides a new biological system that challenges our previous vision of speciation in which similar animals always share similar genome structures.
Collapse
Affiliation(s)
- Charles Plessy
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Onna-son, Okinawa 904-0495, Japan;
| | - Michael J Mansfield
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Onna-son, Okinawa 904-0495, Japan
| | - Aleksandra Bliznina
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Onna-son, Okinawa 904-0495, Japan
| | - Aki Masunaga
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Onna-son, Okinawa 904-0495, Japan
| | - Charlotte West
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Onna-son, Okinawa 904-0495, Japan
| | - Yongkai Tan
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Onna-son, Okinawa 904-0495, Japan
| | - Andrew W Liu
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Onna-son, Okinawa 904-0495, Japan
| | - Jan Grašič
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Onna-son, Okinawa 904-0495, Japan
| | - María Sara Del Río Pisula
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Onna-son, Okinawa 904-0495, Japan
| | - Gaspar Sánchez-Serna
- Departament de Genètica, Microbiologia i Estadística, Facultat de Biologia, Universitat de Barcelona (UB), Barcelona 08028, Spain
- Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona (UB), Barcelona 08028, Spain
| | - Marc Fabrega-Torrus
- Departament de Genètica, Microbiologia i Estadística, Facultat de Biologia, Universitat de Barcelona (UB), Barcelona 08028, Spain
- Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona (UB), Barcelona 08028, Spain
| | - Alfonso Ferrández-Roldán
- Departament de Genètica, Microbiologia i Estadística, Facultat de Biologia, Universitat de Barcelona (UB), Barcelona 08028, Spain
- Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona (UB), Barcelona 08028, Spain
| | - Vittoria Roncalli
- Departament de Genètica, Microbiologia i Estadística, Facultat de Biologia, Universitat de Barcelona (UB), Barcelona 08028, Spain
- Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona (UB), Barcelona 08028, Spain
| | - Pavla Navratilova
- Centre of Plant Structural and Functional Genomics, Institute of Experimental Botany, 779 00 Olomouc, Czech Republic
- Sars International Centre, University of Bergen, Bergen N-5008, Norway
| | - Eric M Thompson
- Sars International Centre, University of Bergen, Bergen N-5008, Norway
- Department of Biological Sciences, University of Bergen, Bergen N-5020, Norway
| | - Takeshi Onuma
- Faculty of Science, Kagoshima University, Kagoshima 890-0065, Japan
- Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Hiroki Nishida
- Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Cristian Cañestro
- Departament de Genètica, Microbiologia i Estadística, Facultat de Biologia, Universitat de Barcelona (UB), Barcelona 08028, Spain
- Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona (UB), Barcelona 08028, Spain
| | - Nicholas M Luscombe
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Onna-son, Okinawa 904-0495, Japan
| |
Collapse
|
4
|
McEvoy SL, Grady PGS, Pauloski N, O'Neill RJ, Wegrzyn JL. Profiling genome-wide methylation in two maples: Fine-scale approaches to detection with nanopore technology. Evol Appl 2024; 17:e13669. [PMID: 38633133 PMCID: PMC11022628 DOI: 10.1111/eva.13669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 02/04/2024] [Accepted: 02/12/2024] [Indexed: 04/19/2024] Open
Abstract
DNA methylation is critical to the regulation of transposable elements and gene expression and can play an important role in the adaptation of stress response mechanisms in plants. Traditional methods of methylation quantification rely on bisulfite conversion that can compromise accuracy. Recent advances in long-read sequencing technologies allow for methylation detection in real time. The associated algorithms that interpret these modifications have evolved from strictly statistical approaches to Hidden Markov Models and, recently, deep learning approaches. Much of the existing software focuses on methylation in the CG context, but methylation in other contexts is important to quantify, as it is extensively leveraged in plants. Here, we present methylation profiles for two maple species across the full range of 5mC sequence contexts using Oxford Nanopore Technologies (ONT) long-reads. Hybrid and reference-guided assemblies were generated for two new Acer accessions: Acer negundo (box elder; 65x ONT and 111X Illumina) and Acer saccharum (sugar maple; 93x ONT and 148X Illumina). The ONT reads generated for these assemblies were re-basecalled, and methylation detection was conducted in a custom pipeline with the published Acer references (PacBio assemblies) and hybrid assemblies reported herein to generate four epigenomes. Examination of the transposable element landscape revealed the dominance of LTR Copia elements and patterns of methylation associated with different classes of TEs. Methylation distributions were examined at high resolution across gene and repeat density and described within the broader angiosperm context, and more narrowly in the context of gene family dynamics and candidate nutrient stress genes.
Collapse
Affiliation(s)
- Susan L. McEvoy
- Department of Ecology and Evolutionary BiologyUniversity of ConnecticutStorrsConnecticutUSA
- Department of Forest SciencesUniversity of HelsinkiHelsinkiFinland
| | - Patrick G. S. Grady
- Department of Molecular and Cell BiologyUniversity of ConnecticutStorrsConnecticutUSA
| | - Nicole Pauloski
- Department of Molecular and Cell BiologyUniversity of ConnecticutStorrsConnecticutUSA
- Institute for Systems GenomicsUniversity of ConnecticutStorrsConnecticutUSA
| | - Rachel J. O'Neill
- Department of Molecular and Cell BiologyUniversity of ConnecticutStorrsConnecticutUSA
- Institute for Systems GenomicsUniversity of ConnecticutStorrsConnecticutUSA
| | - Jill L. Wegrzyn
- Department of Ecology and Evolutionary BiologyUniversity of ConnecticutStorrsConnecticutUSA
- Institute for Systems GenomicsUniversity of ConnecticutStorrsConnecticutUSA
| |
Collapse
|
5
|
Karimi B, Mokhtari K, Rozbahani H, Peymani M, Nabavi N, Entezari M, Rashidi M, Taheriazam A, Ghaedi K, Hashemi M. Pathological roles of miRNAs and pseudogene-derived lncRNAs in human cancers, and their comparison as prognosis/diagnosis biomarkers. Pathol Res Pract 2024; 253:155014. [PMID: 38128189 DOI: 10.1016/j.prp.2023.155014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 12/02/2023] [Accepted: 12/02/2023] [Indexed: 12/23/2023]
Abstract
This review examines and compares the diagnostic and prognostic capabilities of miRNAs and lncRNAs derived from pseudogenes in cancer patients. Additionally, it delves into their roles in cancer pathogenesis. Both miRNAs and pseudogene-derived lncRNAs have undergone thorough investigation as remarkably sensitive and specific cancer biomarkers, offering significant potential for cancer detection and monitoring. . Extensive research is essential to gain a complete understanding of the precise roles these non-coding RNAs play in cancer, allowing the development of novel targeted therapies and biomarkers for improved cancer detection and treatment approaches.
Collapse
Affiliation(s)
- Bahareh Karimi
- Department of Cellular and Molecular Biology and Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
| | - Khatere Mokhtari
- Department of Animal Biotechnology, Cell Science Research Center, Royan Institute for Biotechnology, ACECR, Isfahan, Iran
| | - Hossein Rozbahani
- Department of Psychology, North Tehran Branch, Islamic Azad University, Tehran, Iran; Department of Psychology, West Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Maryam Peymani
- Department of Biology, Faculty of Basic Sciences, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
| | - Noushin Nabavi
- Department of Urologic Sciences and Vancouver Prostate Centre, University of British Columbia, Vancouver, BC V6H3Z6, Canada
| | - Maliheh Entezari
- Farhikhtegan Medical Convergence Sciences Research Center, Farhikhtegan Hospital Tehran Medical Sciences, Islamic Azad University, Tehran, Iran; Department of Genetics, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Mohsen Rashidi
- Department Pharmacology, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran; The Health of Plant and Livestock Products Research Center, Mazandaran University of Medical Sciences, Sari, Iran.
| | - Afshin Taheriazam
- Department of Genetics, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran; Department of Orthopedics, Faculty of medicine, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
| | - Kamran Ghaedi
- Department of Cell and Molecular Biology and Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran.
| | - Mehrdad Hashemi
- Farhikhtegan Medical Convergence Sciences Research Center, Farhikhtegan Hospital Tehran Medical Sciences, Islamic Azad University, Tehran, Iran; Department of Genetics, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
| |
Collapse
|
6
|
Gao D. Introduction of Plant Transposon Annotation for Beginners. BIOLOGY 2023; 12:1468. [PMID: 38132293 PMCID: PMC10741241 DOI: 10.3390/biology12121468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 11/21/2023] [Accepted: 11/23/2023] [Indexed: 12/23/2023]
Abstract
Transposons are mobile DNA sequences that contribute large fractions of many plant genomes. They provide exclusive resources for tracking gene and genome evolution and for developing molecular tools for basic and applied research. Despite extensive efforts, it is still challenging to accurately annotate transposons, especially for beginners, as transposon prediction requires necessary expertise in both transposon biology and bioinformatics. Moreover, the complexity of plant genomes and the dynamic evolution of transposons also bring difficulties for genome-wide transposon discovery. This review summarizes the three major strategies for transposon detection including repeat-based, structure-based, and homology-based annotation, and introduces the transposon superfamilies identified in plants thus far, and some related bioinformatics resources for detecting plant transposons. Furthermore, it describes transposon classification and explains why the terms 'autonomous' and 'non-autonomous' cannot be used to classify the superfamilies of transposons. Lastly, this review also discusses how to identify misannotated transposons and improve the quality of the transposon database. This review provides helpful information about plant transposons and a beginner's guide on annotating these repetitive sequences.
Collapse
Affiliation(s)
- Dongying Gao
- Small Grains and Potato Germplasm Research Unit, USDA-ARS, Aberdeen, ID 83210, USA
| |
Collapse
|
7
|
Liao X, Zhu W, Zhou J, Li H, Xu X, Zhang B, Gao X. Repetitive DNA sequence detection and its role in the human genome. Commun Biol 2023; 6:954. [PMID: 37726397 PMCID: PMC10509279 DOI: 10.1038/s42003-023-05322-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 09/04/2023] [Indexed: 09/21/2023] Open
Abstract
Repetitive DNA sequences playing critical roles in driving evolution, inducing variation, and regulating gene expression. In this review, we summarized the definition, arrangement, and structural characteristics of repeats. Besides, we introduced diverse biological functions of repeats and reviewed existing methods for automatic repeat detection, classification, and masking. Finally, we analyzed the type, structure, and regulation of repeats in the human genome and their role in the induction of complex diseases. We believe that this review will facilitate a comprehensive understanding of repeats and provide guidance for repeat annotation and in-depth exploration of its association with human diseases.
Collapse
Affiliation(s)
- Xingyu Liao
- Computational Bioscience Research Center (CBRC), Computer, Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia
| | - Wufei Zhu
- Department of Endocrinology, Yichang Central People's Hospital, The First College of Clinical Medical Science, China Three Gorges University, 443000, Yichang, P.R. China
| | - Juexiao Zhou
- Computational Bioscience Research Center (CBRC), Computer, Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia
| | - Haoyang Li
- Computational Bioscience Research Center (CBRC), Computer, Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia
| | - Xiaopeng Xu
- Computational Bioscience Research Center (CBRC), Computer, Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia
| | - Bin Zhang
- Computational Bioscience Research Center (CBRC), Computer, Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia
| | - Xin Gao
- Computational Bioscience Research Center (CBRC), Computer, Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.
| |
Collapse
|
8
|
Zhao P, Gu L, Gao Y, Pan Z, Liu L, Li X, Zhou H, Yu D, Han X, Qian L, Liu GE, Fang L, Wang Z. Young SINEs in pig genomes impact gene regulation, genetic diversity, and complex traits. Commun Biol 2023; 6:894. [PMID: 37652983 PMCID: PMC10471783 DOI: 10.1038/s42003-023-05234-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 08/09/2023] [Indexed: 09/02/2023] Open
Abstract
Transposable elements (TEs) are a major source of genetic polymorphisms and play a role in chromatin architecture, gene regulatory networks, and genomic evolution. However, their functional role in pigs and contributions to complex traits are largely unknown. We created a catalog of TEs (n = 3,087,929) in pigs and found that young SINEs were predominantly silenced by histone modifications, DNA methylation, and decreased accessibility. However, some transcripts from active young SINEs showed high tissue-specificity, as confirmed by analyzing 3570 RNA-seq samples. We also detected 211,067 dimorphic SINEs in 374 individuals, including 340 population-specific ones associated with local adaptation. Mapping these dimorphic SINEs to genome-wide associations of 97 complex traits in pigs, we found 54 candidate genes (e.g., ANK2 and VRTN) that might be mediated by TEs. Our findings highlight the important roles of young SINEs and provide a supplement for genotype-to-phenotype associations and modern breeding in pigs.
Collapse
Affiliation(s)
- Pengju Zhao
- Hainan Institute, Zhejiang University, Yongyou Industry Park, Yazhou Bay Sci-Tech City, Sanya, 572000, China
- College of Animal Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Lihong Gu
- Institute of Animal Science & Veterinary Medicine, Hainan Academy of Agricultural Sciences, No. 14 Xingdan Road, Haikou, 571100, China
| | - Yahui Gao
- Animal Genomics and Improvement Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, MD, 20705, USA
| | - Zhangyuan Pan
- Department of Animal Science, University of California, Davis, CA, 95616, USA
| | - Lei Liu
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518124, China
| | - Xingzheng Li
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518124, China
| | - Huaijun Zhou
- Department of Animal Science, University of California, Davis, CA, 95616, USA
| | - Dongyou Yu
- Hainan Institute, Zhejiang University, Yongyou Industry Park, Yazhou Bay Sci-Tech City, Sanya, 572000, China
- College of Animal Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Xinyan Han
- Hainan Institute, Zhejiang University, Yongyou Industry Park, Yazhou Bay Sci-Tech City, Sanya, 572000, China
- College of Animal Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Lichun Qian
- Hainan Institute, Zhejiang University, Yongyou Industry Park, Yazhou Bay Sci-Tech City, Sanya, 572000, China
- College of Animal Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - George E Liu
- Animal Genomics and Improvement Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, MD, 20705, USA.
| | - Lingzhao Fang
- Center for Quantitative Genetics and Genomics, Aarhus University, Aarhus, 8000, Denmark.
| | - Zhengguang Wang
- Hainan Institute, Zhejiang University, Yongyou Industry Park, Yazhou Bay Sci-Tech City, Sanya, 572000, China.
- College of Animal Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China.
| |
Collapse
|
9
|
Nakamura-García AK, Espinal-Enríquez J. Pseudogenes in Cancer: State of the Art. Cancers (Basel) 2023; 15:4024. [PMID: 37627052 PMCID: PMC10452131 DOI: 10.3390/cancers15164024] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 07/24/2023] [Accepted: 07/26/2023] [Indexed: 08/27/2023] Open
Abstract
Pseudogenes are duplicates of protein-coding genes that have accumulated multiple detrimental alterations, rendering them unable to produce the protein they encode. Initially disregarded as "junk DNA" due to their perceived lack of functionality, research on their biological roles has been hindered by this assumption. Nevertheless, recent focus has shifted towards these molecules due to their abnormal expression in cancer phenotypes. In this review, our objective is to provide a thorough overview of the current understanding of pseudogene formation, the mechanisms governing their expression, and the roles they may play in promoting tumorigenesis.
Collapse
|
10
|
Hartig N, Seibt KM, Heitkam T. How to start a LINE: 5' switching rejuvenates LINE retrotransposons in tobacco and related Nicotiana species. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2023. [PMID: 36965091 DOI: 10.1111/tpj.16208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 02/10/2023] [Accepted: 02/19/2023] [Indexed: 06/18/2023]
Abstract
By contrast to their conserved mammalian counterparts, plant long interspersed nuclear elements (LINEs) are highly variable, splitting into many low-copy families. Curiously, LINE families from the retrotransposable element (RTE) clade retain a stronger sequence conservation and hence reach higher copy numbers. The cause of this RTE-typical property is not yet understood, but would help clarify why some transposable elements are removed quickly, whereas others persist in plant genomes. Here, we bring forward a detailed study of RTE LINE structure, diversity and evolution in plants. For this, we argue that the nightshade family is the ideal taxon to follow the evolutionary trajectories of RTE LINEs, given their high abundance, recent activity and partnership to non-autonomous elements. Using bioinformatic, cytogenetic and molecular approaches, we detect 4029 full-length RTE LINEs across the Solanaceae. We finely characterize and manually curate a core group of 458 full-length LINEs in allotetraploid tobacco, show an integration event after polyploidization and trace hybridization by RTE LINE composition of parental genomes. Finally, we reveal the role of the untranslated regions (UTRs) as causes for the unique RTE LINE amplification and evolution pattern in plants. On the one hand, we detected a highly conserved motif at the 3' UTR, suggesting strong selective constraints acting on the RTE terminus. On the other hand, we observed successive rounds of 5' UTR cycling, constantly rejuvenating the promoter sequences. This interplay between exchangeable promoters and conserved LINE bodies and 3' UTR likely allows RTE LINEs to persist and thrive in plant genomes.
Collapse
Affiliation(s)
- Nora Hartig
- Faculty of Botany, Technische Universität Dresden, 01069, Dresden, Germany
| | - Kathrin M Seibt
- Faculty of Botany, Technische Universität Dresden, 01069, Dresden, Germany
| | - Tony Heitkam
- Faculty of Botany, Technische Universität Dresden, 01069, Dresden, Germany
| |
Collapse
|
11
|
Oggenfuss U, Croll D. Recent transposable element bursts are associated with the proximity to genes in a fungal plant pathogen. PLoS Pathog 2023; 19:e1011130. [PMID: 36787337 PMCID: PMC9970103 DOI: 10.1371/journal.ppat.1011130] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 02/27/2023] [Accepted: 01/18/2023] [Indexed: 02/15/2023] Open
Abstract
The activity of transposable elements (TEs) contributes significantly to pathogen genome evolution. TEs often destabilize genome integrity but may also confer adaptive variation in pathogenicity or resistance traits. De-repression of epigenetically silenced TEs often initiates bursts of transposition activity that may be counteracted by purifying selection and genome defenses. However, how these forces interact to determine the expansion routes of TEs within a pathogen species remains largely unknown. Here, we analyzed a set of 19 telomere-to-telomere genomes of the fungal wheat pathogen Zymoseptoria tritici. Phylogenetic reconstruction and ancestral state estimates of individual TE families revealed that TEs have undergone distinct activation and repression periods resulting in highly uneven copy numbers between genomes of the same species. Most TEs are clustered in gene poor niches, indicating strong purifying selection against insertions near coding sequences, or as a consequence of insertion site preferences. TE families with high copy numbers have low sequence divergence and strong signatures of defense mechanisms (i.e., RIP). In contrast, small non-autonomous TEs (i.e., MITEs) are less impacted by defense mechanisms and are often located in close proximity to genes. Individual TE families have experienced multiple distinct burst events that generated many nearly identical copies. We found that a Copia element burst was initiated from recent copies inserted substantially closer to genes compared to older copies. Overall, TE bursts tended to initiate from copies in GC-rich niches that escaped inactivation by genomic defenses. Our work shows how specific genomic environments features provide triggers for TE proliferation in pathogen genomes.
Collapse
Affiliation(s)
- Ursula Oggenfuss
- Laboratory of Evolutionary Genetics, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
| | - Daniel Croll
- Laboratory of Evolutionary Genetics, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
- * E-mail:
| |
Collapse
|
12
|
Wang J, Yuan L, Tang J, Liu J, Sun C, Itgen MW, Chen G, Sessions SK, Zhang G, Mueller RL. Transposable element and host silencing activity in gigantic genomes. Front Cell Dev Biol 2023; 11:1124374. [PMID: 36910142 PMCID: PMC9998948 DOI: 10.3389/fcell.2023.1124374] [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: 12/15/2022] [Accepted: 02/09/2023] [Indexed: 02/26/2023] Open
Abstract
Transposable elements (TEs) and the silencing machinery of their hosts are engaged in a germline arms-race dynamic that shapes TE accumulation and, therefore, genome size. In animal species with extremely large genomes (>10 Gb), TE accumulation has been pushed to the extreme, prompting the question of whether TE silencing also deviates from typical conditions. To address this question, we characterize TE silencing via two pathways-the piRNA pathway and KRAB-ZFP transcriptional repression-in the male and female gonads of Ranodon sibiricus, a salamander species with a ∼21 Gb genome. We quantify 1) genomic TE diversity, 2) TE expression, and 3) small RNA expression and find a significant relationship between the expression of piRNAs and TEs they target for silencing in both ovaries and testes. We also quantified TE silencing pathway gene expression in R. sibiricus and 14 other vertebrates with genome sizes ranging from 1 to 130 Gb and find no association between pathway expression and genome size. Taken together, our results reveal that the gigantic R. sibiricus genome includes at least 19 putatively active TE superfamilies, all of which are targeted by the piRNA pathway in proportion to their expression levels, suggesting comprehensive piRNA-mediated silencing. Testes have higher TE expression than ovaries, suggesting that they may contribute more to the species' high genomic TE load. We posit that apparently conflicting interpretations of TE silencing and genomic gigantism in the literature, as well as the absence of a correlation between TE silencing pathway gene expression and genome size, can be reconciled by considering whether the TE community or the host is currently "on the attack" in the arms race dynamic.
Collapse
Affiliation(s)
- Jie Wang
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan, China
| | - Liang Yuan
- School of Life Sciences, Xinjiang Normal University, Urumqi, China
| | - Jiaxing Tang
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan, China.,College of Life Sciences, Sichuan Normal University, Chengdu, China
| | - Jiongyu Liu
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan, China
| | - Cheng Sun
- College of Life Sciences, Capital Normal University, Beijing, China
| | - Michael W Itgen
- Department of Biology, Colorado State University, Fort Collins, CO, United States
| | - Guiying Chen
- College of Life Sciences, Sichuan Normal University, Chengdu, China
| | | | - Guangpu Zhang
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan, China.,College of Life Sciences, Sichuan Normal University, Chengdu, China
| | | |
Collapse
|
13
|
Berger J, Legendre F, Zelosko KM, Harrison MC, Grandcolas P, Bornberg-Bauer E, Fouks B. Eusocial Transition in Blattodea: Transposable Elements and Shifts of Gene Expression. Genes (Basel) 2022; 13:1948. [PMID: 36360186 PMCID: PMC9689775 DOI: 10.3390/genes13111948] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/19/2022] [Accepted: 10/20/2022] [Indexed: 11/07/2023] Open
Abstract
(1) Unravelling the molecular basis underlying major evolutionary transitions can shed light on how complex phenotypes arise. The evolution of eusociality, a major evolutionary transition, has been demonstrated to be accompanied by enhanced gene regulation. Numerous pieces of evidence suggest the major impact of transposon insertion on gene regulation and its role in adaptive evolution. Transposons have been shown to be play a role in gene duplication involved in the eusocial transition in termites. However, evidence of the molecular basis underlying the eusocial transition in Blattodea remains scarce. Could transposons have facilitated the eusocial transition in termites through shifts of gene expression? (2) Using available cockroach and termite genomes and transcriptomes, we investigated if transposons insert more frequently in genes with differential expression in queens and workers and if those genes could be linked to specific functions essential for eusocial transition. (3) The insertion rate of transposons differs among differentially expressed genes and displays opposite trends between termites and cockroaches. The functions of termite transposon-rich queen- and worker-biased genes are related to reproduction and ageing and behaviour and gene expression, respectively. (4) Our study provides further evidence on the role of transposons in the evolution of eusociality, potentially through shifts in gene expression.
Collapse
Affiliation(s)
- Juliette Berger
- Institut de Systématique, Évolution, Biodiversité (ISYEB), Muséum National d’Histoire Naturelle, CNRS, Sorbonne Université, EPHE, Université des Antilles, CP50, 57 rue Cuvier, 75005 Paris, France
| | - Frédéric Legendre
- Institut de Systématique, Évolution, Biodiversité (ISYEB), Muséum National d’Histoire Naturelle, CNRS, Sorbonne Université, EPHE, Université des Antilles, CP50, 57 rue Cuvier, 75005 Paris, France
| | - Kevin-Markus Zelosko
- Institute for Evolution and Biodiversity, Molecular Evolution and Bioinformatics, Westfälische Wilhelms-Universität, Hüfferstrasse 1, 48149 Münster, Germany
| | - Mark C. Harrison
- Institute for Evolution and Biodiversity, Molecular Evolution and Bioinformatics, Westfälische Wilhelms-Universität, Hüfferstrasse 1, 48149 Münster, Germany
| | - Philippe Grandcolas
- Institut de Systématique, Évolution, Biodiversité (ISYEB), Muséum National d’Histoire Naturelle, CNRS, Sorbonne Université, EPHE, Université des Antilles, CP50, 57 rue Cuvier, 75005 Paris, France
| | - Erich Bornberg-Bauer
- Institute for Evolution and Biodiversity, Molecular Evolution and Bioinformatics, Westfälische Wilhelms-Universität, Hüfferstrasse 1, 48149 Münster, Germany
- Department of Protein Evolution, Max Planck Institute for Developmental Biology, Max-Planck-Ring 5, 72076 Tübingen, Germany
| | - Bertrand Fouks
- Institute for Evolution and Biodiversity, Molecular Evolution and Bioinformatics, Westfälische Wilhelms-Universität, Hüfferstrasse 1, 48149 Münster, Germany
| |
Collapse
|
14
|
Riehl K, Riccio C, Miska EA, Hemberg M. TransposonUltimate: software for transposon classification, annotation and detection. Nucleic Acids Res 2022; 50:e64. [PMID: 35234904 PMCID: PMC9226531 DOI: 10.1093/nar/gkac136] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 02/09/2022] [Accepted: 02/14/2022] [Indexed: 12/17/2022] Open
Abstract
Most genomes harbor a large number of transposons, and they play an important role in evolution and gene regulation. They are also of interest to clinicians as they are involved in several diseases, including cancer and neurodegeneration. Although several methods for transposon identification are available, they are often highly specialised towards specific tasks or classes of transposons, and they lack common standards such as a unified taxonomy scheme and output file format. We present TransposonUltimate, a powerful bundle of three modules for transposon classification, annotation, and detection of transposition events. TransposonUltimate comes as a Conda package under the GPL-3.0 licence, is well documented and it is easy to install through https://github.com/DerKevinRiehl/TransposonUltimate. We benchmark the classification module on the large TransposonDB covering 891,051 sequences to demonstrate that it outperforms the currently best existing solutions. The annotation and detection modules combine sixteen existing softwares, and we illustrate its use by annotating Caenorhabditis elegans, Rhizophagus irregularis and Oryza sativa subs. japonica genomes. Finally, we use the detection module to discover 29 554 transposition events in the genomes of 20 wild type strains of C. elegans. Databases, assemblies, annotations and further findings can be downloaded from (https://doi.org/10.5281/zenodo.5518085).
Collapse
Affiliation(s)
- Kevin Riehl
- Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, UK
| | - Cristian Riccio
- Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, UK
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK
| | - Eric A Miska
- Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, UK
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK
- Department of Genetics, University of Cambridge, Downing Street, Cambridge CB2 3EH, UK
| | - Martin Hemberg
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK
- Evergrande Center for Immunologic Diseases, Harvard Medical School and Brigham and Women’s Hospital, 75 Francis Street, Boston, MA 02215, USA
| |
Collapse
|
15
|
Firsov SY, Kosherova KA, Mukha DV. Identification and functional characterization of the German cockroach, Blattella germanica, short interspersed nuclear elements. PLoS One 2022; 17:e0266699. [PMID: 35696390 PMCID: PMC9191728 DOI: 10.1371/journal.pone.0266699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 03/24/2022] [Indexed: 11/18/2022] Open
Abstract
In recent decades, experimental data has accumulated indicating that short interspersed nuclear elements (SINEs) can play a significant functional role in the regulation of gene expression in the host genome. In addition, molecular markers based on SINE insertion polymorphisms have been developed and are widely used for genetic differentiation of populations of eukaryotic organisms. Using routine bioinformatics analysis and publicly available genomic DNA and small RNA-seq data, we first described nine SINEs in the genome of the German cockroach, Blattella germanica. All described SINEs have tRNA promoters, and the start of their transcription begins 11 bp upstream of an “A” box of these promoters. The number of copies of the described SINEs in the B. germanica genome ranges from several copies to more than a thousand copies in a SINE-specific manner. Some of the described SINEs and their degenerate copies can be localized both in the introns of genes and loci known as piRNA clusters. piRNAs originating from piRNA clusters are shown to be mapped to seven of the nine types of SINEs described, including copies of SINEs localized in gene introns. We speculate that SINEs, localized in the introns of certain genes, may regulate the level of expression of these genes by a PIWI-related molecular mechanism.
Collapse
Affiliation(s)
- Sergei Yu. Firsov
- Vavilov Institute of General Genetics Russian Academy of Sciences, Moscow, Russia
| | - Karina A. Kosherova
- Vavilov Institute of General Genetics Russian Academy of Sciences, Moscow, Russia
| | - Dmitry V. Mukha
- Vavilov Institute of General Genetics Russian Academy of Sciences, Moscow, Russia
- * E-mail:
| |
Collapse
|
16
|
Wang X, D’Alessandro E, Chi C, Moawad AS, Zong W, Chen C, Song C. Genetic Evaluation and Population Structure of Jiangsu Native Pigs in China Revealed by SINE Insertion Polymorphisms. Animals (Basel) 2022; 12:ani12111345. [PMID: 35681812 PMCID: PMC9179424 DOI: 10.3390/ani12111345] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 05/04/2022] [Accepted: 05/18/2022] [Indexed: 12/13/2022] Open
Abstract
Simple Summary In a previous study, 30 SINE-RIPs were applied for population genetic analysis in 7 Chinese miniature pig populations and approved effectively in the genetic distances and breed-relationships between these populations. There are abundant indigenous pigs famous across the world for their prolificacy in the Jiangsu Province of eastern China, such as Meishan, Erhualian. Since pork production relies on limited commercial breeds such as Landrace, Large White, and Duroc pigs, characterized by maximizing productivity in intensive production systems, these indigenous pigs are nowadays decrease sharply. The genetic characterizations of these resources are essential requirements for the development of conservation, selection, and sustainable utilizations. Therefore, SINE-RIPs were selected to evaluate the genetic variation and population structure of Jiangsu pig populations and the results may assist with the conservation and utilization of these native pig populations. Abstract Short interspersed nuclear elements (SINEs), one type of retrotransposon, are considered to be ideal molecular markers due to their wide distribution in the genome, high copy number, and high polymorphism. Preliminary studies have identified more than 35,000 SINE-retrotransposon insertion polymorphisms (RIPs) in the pig genome. In this study, 18 SINE-RIPs were used to evaluate the genetic variation and population structure of seven native pig populations and two crossbreeds in the Jiangsu Province of China. Two commercial pig breeds (Duroc and Large White) and one Italian native breed (Sicilian Black pig) were selected as the control. The results showed that all 18 SINE-RIPs were polymorphic among these pigs. The Jiangsu native pig populations (Erhualian, Fengjing, Middle Meishan, Mi, Shawutou, Small Meishan, and Huai) were shown to be more polymorphic than the crossbreeds (Sushan and Sujiang) and external breeds (Sicilian Black pig, Large White, and Duroc) based on the expected heterozygosity and polymorphic information content values. Some native pigs, including Small Meishan, Mi, Middle Meishan, and Erhualian, had a higher degree of inbreeding according to the FIS values. Based on the neighbor-joining tree, all of the Jiangsu native pig populations formed one branch, while the three external pig breeds formed the other branches, with the two crossbreeds containing more than 50% external pig ancestry. The Huai pigs were independent of the other Jiangsu native pigs but shared a common ancestor with Sujiang and Mi. The results provide a new perspective on the population structure of these native pig breeds and will assist with the conservation and utilization of Chinese native pigs.
Collapse
Affiliation(s)
- Xiaoyan Wang
- College of Animal Science & Technology, Yangzhou University, Yangzhou 225009, China; (X.W.); (C.C.); (A.S.M.); (W.Z.); (C.C.)
| | - Enrico D’Alessandro
- Unit of Animal Production, Department of Veterinary Science, University of Messina, 98168 Messina, Italy;
| | - Chenglin Chi
- College of Animal Science & Technology, Yangzhou University, Yangzhou 225009, China; (X.W.); (C.C.); (A.S.M.); (W.Z.); (C.C.)
| | - Ali Shoaib Moawad
- College of Animal Science & Technology, Yangzhou University, Yangzhou 225009, China; (X.W.); (C.C.); (A.S.M.); (W.Z.); (C.C.)
- Department of Animal Production, Faculty of Agriculture, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Wencheng Zong
- College of Animal Science & Technology, Yangzhou University, Yangzhou 225009, China; (X.W.); (C.C.); (A.S.M.); (W.Z.); (C.C.)
| | - Cai Chen
- College of Animal Science & Technology, Yangzhou University, Yangzhou 225009, China; (X.W.); (C.C.); (A.S.M.); (W.Z.); (C.C.)
| | - Chengyi Song
- College of Animal Science & Technology, Yangzhou University, Yangzhou 225009, China; (X.W.); (C.C.); (A.S.M.); (W.Z.); (C.C.)
- Correspondence: ; Tel./Fax: +86-514-87979034
| |
Collapse
|
17
|
Storer JM, Hubley R, Rosen J, Smit AFA. Methodologies for the De novo Discovery of Transposable Element Families. Genes (Basel) 2022; 13:709. [PMID: 35456515 PMCID: PMC9025800 DOI: 10.3390/genes13040709] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 04/14/2022] [Accepted: 04/15/2022] [Indexed: 02/07/2023] Open
Abstract
The discovery and characterization of transposable element (TE) families are crucial tasks in the process of genome annotation. Careful curation of TE libraries for each organism is necessary as each has been exposed to a unique and often complex set of TE families. De novo methods have been developed; however, a fully automated and accurate approach to the development of complete libraries remains elusive. In this review, we cover established methods and recent developments in de novo TE analysis. We also present various methodologies used to assess these tools and discuss opportunities for further advancement of the field.
Collapse
Affiliation(s)
| | | | | | - Arian F. A. Smit
- Institute for Systems Biology, Seattle, WA 98109, USA; (J.M.S.); (R.H.); (J.R.)
| |
Collapse
|
18
|
Specificities and Dynamics of Transposable Elements in Land Plants. BIOLOGY 2022; 11:biology11040488. [PMID: 35453688 PMCID: PMC9033089 DOI: 10.3390/biology11040488] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/10/2022] [Accepted: 03/18/2022] [Indexed: 01/27/2023]
Abstract
Simple Summary Transposable elements are dynamic components of plant genomes, and display a high diversity of lineages and distribution as the result of evolutionary driving forces and overlapping mechanisms of genetic and epigenetic regulation. They are now regarded as main contributors for genome evolution and function, and important regulators of endogenous gene expression. In this review, we survey recent progress and current challenges in the identification and classification of transposon lineages in complex plant genomes, highlighting the molecular specificities that may explain the expansion and diversification of mobile genetic elements in land plants. Abstract Transposable elements (TEs) are important components of most plant genomes. These mobile repetitive sequences are highly diverse in terms of abundance, structure, transposition mechanisms, activity and insertion specificities across plant species. This review will survey the different mechanisms that may explain the variability of TE patterns in land plants, highlighting the tight connection between TE dynamics and host genome specificities, and their co-evolution to face and adapt to a changing environment. We present the current TE classification in land plants, and describe the different levels of genetic and epigenetic controls originating from the plant, the TE itself, or external environmental factors. Such overlapping mechanisms of TE regulation might be responsible for the high diversity and dynamics of plant TEs observed in nature.
Collapse
|
19
|
Zagoskin MV, Wang J, Neff AT, Veronezi GMB, Davis RE. Small RNA pathways in the nematode Ascaris in the absence of piRNAs. Nat Commun 2022; 13:837. [PMID: 35149688 PMCID: PMC8837657 DOI: 10.1038/s41467-022-28482-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 01/13/2022] [Indexed: 02/07/2023] Open
Abstract
Small RNA pathways play key and diverse regulatory roles in C. elegans, but our understanding of their conservation and contributions in other nematodes is limited. We analyzed small RNA pathways in the divergent parasitic nematode Ascaris. Ascaris has ten Argonautes with five worm-specific Argonautes (WAGOs) that associate with secondary 5’-triphosphate 22-24G-RNAs. These small RNAs target repetitive sequences or mature mRNAs and are similar to the C. elegans mutator, nuclear, and CSR-1 small RNA pathways. Even in the absence of a piRNA pathway, Ascaris CSR-1 may still function to “license” as well as fine-tune or repress gene expression. Ascaris ALG-4 and its associated 26G-RNAs target and likely repress specific mRNAs during testis meiosis. Ascaris WAGO small RNAs demonstrate target plasticity changing their targets between repeats and mRNAs during development. We provide a unique and comprehensive view of mRNA and small RNA expression throughout spermatogenesis. Overall, our study illustrates the conservation, divergence, dynamics, and flexibility of small RNA pathways in nematodes. The parasitic nematode Ascaris lacks piRNAs. Here the authors compare Argonaute proteins and small RNAs from C. elegans and Ascaris, expanding our understanding of the conservation, divergence, and flexibility of Argonautes and small RNA pathways in nematodes.
Collapse
Affiliation(s)
- Maxim V Zagoskin
- Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Aurora, CO, USA.,RNA Bioscience Initiative, University of Colorado School of Medicine, Aurora, CO, USA.,Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN, USA
| | - Jianbin Wang
- Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Aurora, CO, USA. .,RNA Bioscience Initiative, University of Colorado School of Medicine, Aurora, CO, USA. .,Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN, USA. .,UT-ORNL Graduate School of Genome Science and Technology, University of Tennessee, Knoxville, TN, USA.
| | - Ashley T Neff
- Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Aurora, CO, USA
| | - Giovana M B Veronezi
- Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Aurora, CO, USA
| | - Richard E Davis
- Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Aurora, CO, USA. .,RNA Bioscience Initiative, University of Colorado School of Medicine, Aurora, CO, USA.
| |
Collapse
|
20
|
Li Y, Jiang N, Sun Y. AnnoSINE: a short interspersed nuclear elements annotation tool for plant genomes. PLANT PHYSIOLOGY 2022; 188:955-970. [PMID: 34792587 PMCID: PMC8825457 DOI: 10.1093/plphys/kiab524] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 10/01/2021] [Indexed: 06/13/2023]
Abstract
Short interspersed nuclear elements (SINEs) are a widespread type of small transposable element (TE). With increasing evidence for their impact on gene function and genome evolution in plants, accurate genome-scale SINE annotation becomes a fundamental step for studying the regulatory roles of SINEs and their relationship with other components in the genomes. Despite the overall promising progress made in TE annotation, SINE annotation remains a major challenge. Unlike some other TEs, SINEs are short and heterogeneous, and they usually lack well-conserved sequence or structural features. Thus, current SINE annotation tools have either low sensitivity or high false discovery rates. Given the demand and challenges, we aimed to provide a more accurate and efficient SINE annotation tool for plant genomes. The pipeline starts with maximizing the pool of SINE candidates via profile hidden Markov model-based homology search and de novo SINE search using structural features. Then, it excludes the false positives by integrating all known features of SINEs and the features of other types of TEs that can often be misannotated as SINEs. As a result, the pipeline substantially improves the tradeoff between sensitivity and accuracy, with both values close to or over 90%. We tested our tool in Arabidopsis thaliana and rice (Oryza sativa), and the results show that our tool competes favorably against existing SINE annotation tools. The simplicity and effectiveness of this tool would potentially be useful for generating more accurate SINE annotations for other plant species. The pipeline is freely available at https://github.com/yangli557/AnnoSINE.
Collapse
Affiliation(s)
- Yang Li
- Department of Electrical Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, China
| | - Ning Jiang
- Department of Horticulture, Michigan State University, East Lansing, Michigan 48824, USA
| | - Yanni Sun
- Department of Electrical Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, China
| |
Collapse
|
21
|
Wang L, Zhu T, Rodriguez JC, Deal KR, Dubcovsky J, McGuire PE, Lux T, Spannagl M, Mayer KFX, Baldrich P, Meyers BC, Huo N, Gu YQ, Zhou H, Devos KM, Bennetzen JL, Unver T, Budak H, Gulick PJ, Galiba G, Kalapos B, Nelson DR, Li P, You FM, Luo MC, Dvorak J. Aegilops tauschii genome assembly Aet v5.0 features greater sequence contiguity and improved annotation. G3-GENES GENOMES GENETICS 2021; 11:6369516. [PMID: 34515796 PMCID: PMC8664484 DOI: 10.1093/g3journal/jkab325] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Accepted: 08/31/2021] [Indexed: 01/01/2023]
Abstract
Aegilops tauschii is the donor of the D subgenome of hexaploid wheat and an important genetic resource. The reference-quality genome sequence Aet v4.0 for Ae. tauschii acc. AL8/78 was therefore an important milestone for wheat biology and breeding. Further advances in sequencing acc. AL8/78 and release of the Aet v5.0 sequence assembly are reported here. Two new optical maps were constructed and used in the revision of pseudomolecules. Gaps were closed with Pacific Biosciences long-read contigs, decreasing the gap number by 38,899. Transposable elements and protein-coding genes were reannotated. The number of annotated high-confidence genes was reduced from 39,635 in Aet v4.0 to 32,885 in Aet v5.0. A total of 2245 biologically important genes, including those affecting plant phenology, grain quality, and tolerance of abiotic stresses in wheat, was manually annotated and disease-resistance genes were annotated by a dedicated pipeline. Disease-resistance genes encoding nucleotide-binding site domains, receptor-like protein kinases, and receptor-like proteins were preferentially located in distal chromosome regions, whereas those encoding transmembrane coiled-coil proteins were dispersed more evenly along the chromosomes. Discovery, annotation, and expression analyses of microRNA (miRNA) precursors, mature miRNAs, and phasiRNAs are reported, including miRNA target genes. Other small RNAs, such as hc-siRNAs and tRFs, were characterized. These advances enhance the utility of the Ae. tauschii genome sequence for wheat genetics, biotechnology, and breeding.
Collapse
Affiliation(s)
- Le Wang
- Department of Plant Sciences, University of California, Davis, Davis, California 95616, USA
| | - Tingting Zhu
- Department of Plant Sciences, University of California, Davis, Davis, California 95616, USA
| | - Juan C Rodriguez
- Department of Plant Sciences, University of California, Davis, Davis, California 95616, USA
| | - Karin R Deal
- Department of Plant Sciences, University of California, Davis, Davis, California 95616, USA
| | - Jorge Dubcovsky
- Department of Plant Sciences, University of California, Davis, Davis, California 95616, USA
| | - Patrick E McGuire
- Department of Plant Sciences, University of California, Davis, Davis, California 95616, USA
| | - Thomas Lux
- Plant Genome and Systems Biology, Helmholtz Zentrum München, Munich 85764, Germany
| | - Manuel Spannagl
- Plant Genome and Systems Biology, Helmholtz Zentrum München, Munich 85764, Germany
| | - Klaus F X Mayer
- Plant Genome and Systems Biology, Helmholtz Zentrum München, Munich 85764, Germany
| | - Patricia Baldrich
- Donald Danforth Plant Science Center, St. Louis, Missouri 63132, USA
| | - Blake C Meyers
- Donald Danforth Plant Science Center, St. Louis, Missouri 63132, USA.,University of Missouri, Columbia, Division of Plant Sciences, Columbia, Missouri 65211, USA
| | - Naxin Huo
- Crop Improvement and Genetics Research Unit, USDA-ARS, Albany, California 94710, USA
| | - Yong Q Gu
- Crop Improvement and Genetics Research Unit, USDA-ARS, Albany, California 94710, USA
| | - Hongye Zhou
- Institute of Bioinformatics, University of Georgia, Athens, Georgia 30602, USA
| | - Katrien M Devos
- Institute of Plant Breeding, Genetics and Genomics (Dept. of Crop & Soil Sciences) and Dept. of Plant Biology, University of Georgia, Athens, Georgia 30602, USA
| | | | - Turgay Unver
- Ficus Biotechnology, Ostim Teknopark, Ankara 06374, Turkey
| | - Hikmet Budak
- Montana BioAg Inc., Missoula, Montana 59801, USA
| | - Patrick J Gulick
- Department of Biology, Concordia University, Montreal, Quebec H3G 1M8, Canada
| | - Gabor Galiba
- Department of Biological Resources, Centre for Agricultural Research, Eötvös Loránd Research Network, H-2462 Martonvásár, Hungary.,Department of Environmental Sustainability, IES, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
| | - Balázs Kalapos
- Department of Biological Resources, Centre for Agricultural Research, Eötvös Loránd Research Network, H-2462 Martonvásár, Hungary
| | - David R Nelson
- University of Tennessee Health Science Center, Memphis, Tennessee 38163, USA
| | - Pingchuan Li
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, Ontario K1A 0C5, Canada
| | - Frank M You
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, Ontario K1A 0C5, Canada
| | - Ming-Cheng Luo
- Department of Plant Sciences, University of California, Davis, Davis, California 95616, USA
| | - Jan Dvorak
- Department of Plant Sciences, University of California, Davis, Davis, California 95616, USA
| |
Collapse
|
22
|
Ding M, Li XY, Zhu ZX, Chen JH, Lu M, Shi Q, Wang Y, Li Z, Zhao X, Wang T, Du WX, Miao C, Yao TZ, Wang MT, Zhang XJ, Wang ZW, Zhou L, Gui JF. Genomic anatomy of male-specific microchromosomes in a gynogenetic fish. PLoS Genet 2021; 17:e1009760. [PMID: 34491994 PMCID: PMC8448357 DOI: 10.1371/journal.pgen.1009760] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 09/17/2021] [Accepted: 08/09/2021] [Indexed: 11/19/2022] Open
Abstract
Unisexual taxa are commonly considered short-lived as the absence of meiotic recombination is supposed to accumulate deleterious mutations and hinder the creation of genetic diversity. However, the gynogenetic gibel carp (Carassius gibelio) with high genetic diversity and wide ecological distribution has outlived its predicted extinction time of a strict unisexual reproduction population. Unlike other unisexual vertebrates, males associated with supernumerary microchromosomes have been observed in gibel carp, which provides a unique system to explore the rationales underlying male occurrence in unisexual lineage and evolution of unisexual reproduction. Here, we identified a massively expanded satellite DNA cluster on microchromosomes of hexaploid gibel carp via comparing with the ancestral tetraploid crucian carp (Carassius auratus). Based on the satellite cluster, we developed a method for single chromosomal fluorescence microdissection and isolated three male-specific microchromosomes in a male metaphase cell. Genomic anatomy revealed that these male-specific microchromosomes contained homologous sequences of autosomes and abundant repetitive elements. Significantly, several potential male-specific genes with transcriptional activity were identified, among which four and five genes displayed male-specific and male-biased expression in gonads, respectively, during the developmental period of sex determination. Therefore, the male-specific microchromosomes resembling common features of sex chromosomes may be the main driving force for male occurrence in gynogenetic gibel carp, which sheds new light on the evolution of unisexual reproduction.
Collapse
Affiliation(s)
- Miao Ding
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xi-Yin Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Zhi-Xuan Zhu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Jun-Hui Chen
- BGI Genomics, BGI-Shenzhen, Shenzhen, China
- ShenZhen People’s Hospital, Shenzhen, China
| | - Meng Lu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Qian Shi
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yang Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Zhi Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xin Zhao
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Tao Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Wen-Xuan Du
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Chun Miao
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Tian-Zi Yao
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Ming-Tao Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xiao-Juan Zhang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Zhong-Wei Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Li Zhou
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Jian-Fang Gui
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovative Academy of Seed Design, Hubei Hongshan Laboratory, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| |
Collapse
|
23
|
Ludwig A, Schemberger MO, Gazolla CB, de Moura Gama J, Duarte I, Lopes ALK, Mathias C, Petters-Vandresen DAL, Zattera ML, Bruschi DP. Transposable elements expression in Rhinella marina (cane toad) specimens submitted to immune and stress challenge. Genetica 2021; 149:335-342. [PMID: 34383169 DOI: 10.1007/s10709-021-00130-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 08/02/2021] [Indexed: 11/27/2022]
Abstract
Transposable elements (TEs) are important components of eukaryotic genomes and compose around 30% of the genome of Rhinella marina, an invasive toad species. Considering the possible role of TEs in the adaptation of populations, we have analyzed the expression of TEs in publicly available spleen tissue transcriptomic data generated for this species after immune and stress challenge. By analyzing the transcriptome assembly, we detected a high number of TE segments. Moreover, some distinct TE families were differentially expressed in some conditions. Our result shows that several TEs are capable of being transcribed in R. marina and they could help to generate a rapid response of specimens to the environment. Also, we can suggest that these TEs could be activated in the germinative cells as well producing variability to be selected and shaped by the evolutionary processes behind the success of this invasive species. Thus, the TEs are important targets for investigation in the context of R. marina adaptation.
Collapse
Affiliation(s)
- Adriana Ludwig
- Laboratório de Ciências e Tecnologias Aplicadas em Saúde (LaCTAS), Instituto Carlos Chagas - Fiocruz-PR, Curitiba, Paraná, Brazil
| | - Michelle Orane Schemberger
- Laboratório de Biotecnologia Aplicada a Fruticultura, Departamento de Fitotecnia e Fitossanidade, Universidade Estadual de Ponta Grossa (UEPG), Ponta Grossa, Paraná, Brazil
| | - Camilla Borges Gazolla
- Programa de Pós-Graduação em Genética (PPG-GEN), Universidade Federal do Paraná (UFPR), Curitiba, Brazil
| | - Joana de Moura Gama
- Programa de Pós-Graduação em Genética (PPG-GEN), Universidade Federal do Paraná (UFPR), Curitiba, Brazil
| | - Iraine Duarte
- Programa de Pós-Graduação em Genética (PPG-GEN), Universidade Federal do Paraná (UFPR), Curitiba, Brazil
| | - Ana Luisa Kalb Lopes
- Laboratório de Ciências e Tecnologias Aplicadas em Saúde (LaCTAS), Instituto Carlos Chagas - Fiocruz-PR, Curitiba, Paraná, Brazil
- Pós-Graduação em Biologia Celular e Molecular, Universidade Federal do Paraná, Curitiba, Paraná, Brazil
| | - Carolina Mathias
- Programa de Pós-Graduação em Genética (PPG-GEN), Universidade Federal do Paraná (UFPR), Curitiba, Brazil
| | | | - Michelle Louise Zattera
- Programa de Pós-Graduação em Genética (PPG-GEN), Universidade Federal do Paraná (UFPR), Curitiba, Brazil
| | - Daniel Pacheco Bruschi
- Programa de Pós-Graduação em Genética (PPG-GEN), Universidade Federal do Paraná (UFPR), Curitiba, Brazil.
- Laboratório de Citogenética Evolutiva e Conservação Animal (LabCECA), Departamento de Genética, Universidade Federal do Paraná (UFPR), Curitiba, Brazil.
| |
Collapse
|
24
|
Wang X, Liu S, Zuo H, Zheng W, Zhang S, Huang Y, Pingcuo G, Ying H, Zhao F, Li Y, Liu J, Yi TS, Zan Y, Larkin RM, Deng X, Zeng X, Xu Q. Genomic basis of high-altitude adaptation in Tibetan Prunus fruit trees. Curr Biol 2021; 31:3848-3860.e8. [PMID: 34314676 DOI: 10.1016/j.cub.2021.06.062] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 02/25/2021] [Accepted: 06/22/2021] [Indexed: 01/03/2023]
Abstract
The Great Himalayan Mountains and their foothills are believed to be the place of origin and development of many plant species. The genetic basis of adaptation to high plateaus is a fascinating topic that is poorly understood at the population level. We comprehensively collected and sequenced 377 accessions of Prunus germplasm along altitude gradients ranging from 2,067 to 4,492 m in the Himalayas. We de novo assembled three high-quality genomes of Tibetan Prunus species. A comparative analysis of Prunus genomes indicated a remarkable expansion of the SINE retrotransposons occurred in the genomes of Tibetan species. We observed genetic differentiation between Tibetan peaches from high and low altitudes and that genes associated with light stress signaling, especially UV stress signaling, were enriched in the differentiated regions. By profiling the metabolomes of Tibetan peach fruit, we determined 379 metabolites had significant genetic correlations with altitudes and that in particular phenylpropanoids were positively correlated with altitudes. We identified 62 Tibetan peach-specific SINEs that colocalized with metabolites differentially accumualted in Tibetan relative to cultivated peach. We demonstrated that two SINEs were inserted in a locus controlling the accumulation of 3-O-feruloyl quinic acid. SINE1 was specific to Tibetan peach. SINE2 was predominant in high altitudes and associated with the accumulation of 3-O-feruloyl quinic acid. These genomic and metabolic data for Prunus populations native to the Himalayan region indicate that the expansion of SINE retrotransposons helped Tibetan Prunus species adapt to the harsh environment of the Himalayan plateau by promoting the accumulation of beneficial metabolites.
Collapse
Affiliation(s)
- Xia Wang
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Horticultural Crop (Fruit trees) Biology and Genetic Improvement (Ministry of Agriculture and Rural Affairs), Huazhong Agricultural University, Wuhan 430070, China
| | - Shengjun Liu
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Horticultural Crop (Fruit trees) Biology and Genetic Improvement (Ministry of Agriculture and Rural Affairs), Huazhong Agricultural University, Wuhan 430070, China
| | - Hao Zuo
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Horticultural Crop (Fruit trees) Biology and Genetic Improvement (Ministry of Agriculture and Rural Affairs), Huazhong Agricultural University, Wuhan 430070, China
| | - Weikang Zheng
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Horticultural Crop (Fruit trees) Biology and Genetic Improvement (Ministry of Agriculture and Rural Affairs), Huazhong Agricultural University, Wuhan 430070, China
| | - Shanshan Zhang
- Qinghai-Tibet Plateau Fruit Trees Scientific Observation Test Station (Ministry of Agriculture and Rural Affairs), Lhasa, Tibet 850032, China; Institute of Vegetables, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet 850002, China
| | - Yue Huang
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Horticultural Crop (Fruit trees) Biology and Genetic Improvement (Ministry of Agriculture and Rural Affairs), Huazhong Agricultural University, Wuhan 430070, China
| | - Gesang Pingcuo
- Qinghai-Tibet Plateau Fruit Trees Scientific Observation Test Station (Ministry of Agriculture and Rural Affairs), Lhasa, Tibet 850032, China; Institute of Vegetables, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet 850002, China
| | - Hong Ying
- Qinghai-Tibet Plateau Fruit Trees Scientific Observation Test Station (Ministry of Agriculture and Rural Affairs), Lhasa, Tibet 850032, China; Institute of Vegetables, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet 850002, China
| | - Fan Zhao
- Qinghai-Tibet Plateau Fruit Trees Scientific Observation Test Station (Ministry of Agriculture and Rural Affairs), Lhasa, Tibet 850032, China; Institute of Vegetables, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet 850002, China
| | - Yuanrong Li
- Qinghai-Tibet Plateau Fruit Trees Scientific Observation Test Station (Ministry of Agriculture and Rural Affairs), Lhasa, Tibet 850032, China; Institute of Vegetables, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet 850002, China
| | - Junwei Liu
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Horticultural Crop (Fruit trees) Biology and Genetic Improvement (Ministry of Agriculture and Rural Affairs), Huazhong Agricultural University, Wuhan 430070, China
| | - Ting-Shuang Yi
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Yanjun Zan
- Department of Forestry Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Umeå 90736, Sweden
| | - Robert M Larkin
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan 430070, China
| | - Xiuxin Deng
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan 430070, China; Hubei Hongshan Laboratory, Wuhan 430070, China; Key Laboratory of Horticultural Crop (Fruit trees) Biology and Genetic Improvement (Ministry of Agriculture and Rural Affairs), Huazhong Agricultural University, Wuhan 430070, China
| | - Xiuli Zeng
- Qinghai-Tibet Plateau Fruit Trees Scientific Observation Test Station (Ministry of Agriculture and Rural Affairs), Lhasa, Tibet 850032, China; Institute of Vegetables, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet 850002, China.
| | - Qiang Xu
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan 430070, China; Hubei Hongshan Laboratory, Wuhan 430070, China; Key Laboratory of Horticultural Crop (Fruit trees) Biology and Genetic Improvement (Ministry of Agriculture and Rural Affairs), Huazhong Agricultural University, Wuhan 430070, China.
| |
Collapse
|
25
|
Lee RC, Farfan-Caceres L, Debler JW, Williams AH, Syme RA, Henares BM. Reference genome assembly for Australian Ascochyta lentis isolate Al4. G3-GENES GENOMES GENETICS 2021; 11:6114462. [PMID: 33604672 PMCID: PMC8022934 DOI: 10.1093/g3journal/jkab006] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 12/22/2020] [Indexed: 02/06/2023]
Abstract
Ascochyta lentis causes ascochyta blight in lentil (Lens culinaris Medik.) and yield loss can be as high as 50%. With careful agronomic management practices, fungicide use, and advances in breeding resistant lentil varieties, disease severity and impact to farmers have been largely controlled. However, evidence from major lentil producing countries, Canada and Australia, suggests that A. lentis isolates can change their virulence profile and level of aggressiveness over time and under different selection pressures. In this paper, we describe the first genome assembly for A. lentis for the Australian isolate Al4, through the integration of data from Illumina and PacBio SMRT sequencing. The Al4 reference genome assembly is almost 42 Mb in size and encodes 11,638 predicted genes. The Al4 genome comprises 21 full-length and gapless chromosomal contigs and two partial chromosome contigs each with one telomere. We predicted 31 secondary metabolite clusters, and 38 putative protein effectors, many of which were classified as having an unknown function. Comparison of A. lentis genome features with the recently published reference assembly for closely related A. rabiei show that genome synteny between these species is highly conserved. However, there are several translocations and inversions of genome sequence. The location of secondary metabolite clusters near transposable element and repeat-rich genomic regions was common for A. lentis as has been reported for other fungal plant pathogens.
Collapse
Affiliation(s)
- Robert C Lee
- Corresponding authors: Centre for Crop and Disease Management, School of Molecular and Life Sciences, Curtin University, Kent St, Bentley, WA 6102, Australia. (B.M.H.); (R.C.L.)
| | - Lina Farfan-Caceres
- Centre for Crop and Disease Management, School of Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Johannes W Debler
- Centre for Crop and Disease Management, School of Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Angela H Williams
- Department of Environment and Agriculture, Curtin University, Bentley, WA 6102, Australia
| | - Robert A Syme
- Centre for Crop and Disease Management, School of Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Bernadette M Henares
- Corresponding authors: Centre for Crop and Disease Management, School of Molecular and Life Sciences, Curtin University, Kent St, Bentley, WA 6102, Australia. (B.M.H.); (R.C.L.)
| |
Collapse
|
26
|
Bliznina A, Masunaga A, Mansfield MJ, Tan Y, Liu AW, West C, Rustagi T, Chien HC, Kumar S, Pichon J, Plessy C, Luscombe NM. Telomere-to-telomere assembly of the genome of an individual Oikopleura dioica from Okinawa using Nanopore-based sequencing. BMC Genomics 2021; 22:222. [PMID: 33781200 PMCID: PMC8008620 DOI: 10.1186/s12864-021-07512-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 03/05/2021] [Indexed: 11/10/2022] Open
Abstract
Background The larvacean Oikopleura dioica is an abundant tunicate plankton with the smallest (65–70 Mbp) non-parasitic, non-extremophile animal genome identified to date. Currently, there are two genomes available for the Bergen (OdB3) and Osaka (OSKA2016) O. dioica laboratory strains. Both assemblies have full genome coverage and high sequence accuracy. However, a chromosome-scale assembly has not yet been achieved. Results Here, we present a chromosome-scale genome assembly (OKI2018_I69) of the Okinawan O. dioica produced using long-read Nanopore and short-read Illumina sequencing data from a single male, combined with Hi-C chromosomal conformation capture data for scaffolding. The OKI2018_I69 assembly has a total length of 64.3 Mbp distributed among 19 scaffolds. 99% of the assembly is contained within five megabase-scale scaffolds. We found telomeres on both ends of the two largest scaffolds, which represent assemblies of two fully contiguous autosomal chromosomes. Each of the other three large scaffolds have telomeres at one end only and we propose that they correspond to sex chromosomes split into a pseudo-autosomal region and X-specific or Y-specific regions. Indeed, these five scaffolds mostly correspond to equivalent linkage groups in OdB3, suggesting overall agreement in chromosomal organization between the two populations. At a more detailed level, the OKI2018_I69 assembly possesses similar genomic features in gene content and repetitive elements reported for OdB3. The Hi-C map suggests few reciprocal interactions between chromosome arms. At the sequence level, multiple genomic features such as GC content and repetitive elements are distributed differently along the short and long arms of the same chromosome. Conclusions We show that a hybrid approach of integrating multiple sequencing technologies with chromosome conformation information results in an accurate de novo chromosome-scale assembly of O. dioica’s highly polymorphic genome. This genome assembly opens up the possibility of cross-genome comparison between O. dioica populations, as well as of studies of chromosomal evolution in this lineage. Supplementary Information The online version contains supplementary material available at 10.1186/s12864-021-07512-6.
Collapse
Affiliation(s)
- Aleksandra Bliznina
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan.
| | - Aki Masunaga
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
| | - Michael J Mansfield
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
| | - Yongkai Tan
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
| | - Andrew W Liu
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
| | - Charlotte West
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan.,Francis Crick Institute, London, UK
| | - Tanmay Rustagi
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
| | - Hsiao-Chiao Chien
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
| | - Saurabh Kumar
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
| | - Julien Pichon
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
| | - Charles Plessy
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan.
| | - Nicholas M Luscombe
- Genomics and Regulatory Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan.,Francis Crick Institute, London, UK.,Department of Genetics, Evolution and Environment, UCL Genetics Institute, University College London, London, UK
| |
Collapse
|
27
|
Wang J, Itgen MW, Wang H, Gong Y, Jiang J, Li J, Sun C, Sessions SK, Mueller RL. Gigantic Genomes Provide Empirical Tests of Transposable Element Dynamics Models. GENOMICS PROTEOMICS & BIOINFORMATICS 2021; 19:123-139. [PMID: 33677107 PMCID: PMC8498967 DOI: 10.1016/j.gpb.2020.11.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 11/29/2020] [Accepted: 11/30/2020] [Indexed: 12/12/2022]
Abstract
Transposable elements (TEs) are a major determinant of eukaryotic genome size. The collective properties of a genomic TE community reveal the history of TE/host evolutionary dynamics and impact present-day host structure and function, from genome to organism levels. In rare cases, TE community/genome size has greatly expanded in animals, associated with increased cell size and changes to anatomy and physiology. Here, we characterize the TE landscape of the genome and transcriptome in an amphibian with a giant genome — the caecilianIchthyophis bannanicus, which we show has a genome size of 12.2 Gb. Amphibians are an important model system because the clade includes independent cases of genomic gigantism. The I. bannanicus genome differs compositionally from other giant amphibian genomes, but shares a low rate of ectopic recombination-mediated deletion. We examine TE activity using expression and divergence plots; TEs account for 15% of somatic transcription, and most superfamilies appear active. We quantify TE diversity in the caecilian, as well as other vertebrates with a range of genome sizes, using diversity indices commonly applied in community ecology. We synthesize previous models that integrate TE abundance, diversity, and activity, and test whether the caecilian meets model predictions for genomes with high TE abundance. We propose thorough, consistent characterization of TEs to strengthen future comparative analyses. Such analyses will ultimately be required to reveal whether the divergent TE assemblages found across convergent gigantic genomes reflect fundamental shared features of TE/host genome evolutionary dynamics.
Collapse
Affiliation(s)
- Jie Wang
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
| | - Michael W Itgen
- Department of Biology, Colorado State University, Fort Collins, CO 80523, USA
| | - Huiju Wang
- School of Information and Safety Engineering, Zhongnan University of Economics and Law, Wuhan 430073, China
| | - Yuzhou Gong
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
| | - Jianping Jiang
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
| | - Jiatang Li
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
| | - Cheng Sun
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | | | | |
Collapse
|
28
|
Genome assembly and population genomic analysis provide insights into the evolution of modern sweet corn. Nat Commun 2021; 12:1227. [PMID: 33623026 PMCID: PMC7902669 DOI: 10.1038/s41467-021-21380-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 01/26/2021] [Indexed: 01/31/2023] Open
Abstract
Sweet corn is one of the most important vegetables in the United States and Canada. Here, we present a de novo assembly of a sweet corn inbred line Ia453 with the mutated shrunken2-reference allele (Ia453-sh2). This mutation accumulates more sugar and is present in most commercial hybrids developed for the processing and fresh markets. The ten pseudochromosomes cover 92% of the total assembly and 99% of the estimated genome size, with a scaffold N50 of 222.2 Mb. This reference genome completely assembles the large structural variation that created the mutant sh2-R allele. Furthermore, comparative genomics analysis with six field corn genomes highlights differences in single-nucleotide polymorphisms, structural variations, and transposon composition. Phylogenetic analysis of 5,381 diverse maize and teosinte accessions reveals genetic relationships between sweet corn and other types of maize. Our results show evidence for a common origin in northern Mexico for modern sweet corn in the U.S. Finally, population genomic analysis identifies regions of the genome under selection and candidate genes associated with sweet corn traits, such as early flowering, endosperm composition, plant and tassel architecture, and kernel row number. Our study provides a high-quality reference-genome sequence to facilitate comparative genomics, functional studies, and genomic-assisted breeding for sweet corn.
Collapse
|
29
|
Suvorova YM, Kamionskaya AM, Korotkov EV. Search for SINE repeats in the rice genome using correlation-based position weight matrices. BMC Bioinformatics 2021; 22:42. [PMID: 33530928 PMCID: PMC7852121 DOI: 10.1186/s12859-021-03977-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 01/21/2021] [Indexed: 11/21/2022] Open
Abstract
Background Transposable elements (TEs) constitute a significant part of eukaryotic genomes. Short interspersed nuclear elements (SINEs) are non-autonomous TEs, which are widely represented in mammalian genomes and also found in plants. After insertion in a new position in the genome, TEs quickly accumulate mutations, which complicate their identification and annotation by modern bioinformatics methods. In this study, we searched for highly divergent SINE copies in the genome of rice (Oryza sativa subsp. japonica) using the Highly Divergent Repeat Search Method (HDRSM). Results The HDRSM considers correlations of neighboring symbols to construct position weight matrix (PWM) for a SINE family, which is then used to perform a search for new copies. In order to evaluate the accuracy of the method and compare it with the RepeatMasker program, we generated a set of SINE copies containing nucleotide substitutions and indels and inserted them into an artificial chromosome for analysis. The HDRSM showed better results both in terms of the number of identified inserted repeats and the accuracy of determining their boundaries. A search for the copies of 39 SINE families in the rice genome produced 14,030 hits; among them, 5704 were not detected by RepeatMasker. Conclusions The HDRSM could find divergent SINE copies, correctly determine their boundaries, and offer a high level of statistical significance. We also found that RepeatMasker is able to find relatively short copies of the SINE families with a higher level of similarity, while HDRSM is able to find more diverged copies. To obtain a comprehensive profile of SINE distribution in the genome, combined application of the HDRSM and RepeatMasker is recommended.
Collapse
Affiliation(s)
- Yulia M Suvorova
- Research Center of Biotechnology of the Russian Academy of Sciences, 60 let Oktjabrja pr-t, 7, bld. 1, Moscow, Russia.
| | - Anastasia M Kamionskaya
- Research Center of Biotechnology of the Russian Academy of Sciences, 60 let Oktjabrja pr-t, 7, bld. 1, Moscow, Russia
| | - Eugene V Korotkov
- Research Center of Biotechnology of the Russian Academy of Sciences, 60 let Oktjabrja pr-t, 7, bld. 1, Moscow, Russia
| |
Collapse
|
30
|
KLAI K, CHÉNAIS B, ZIDI M, DJEBBI S, CARUSO A, DENIS F, CONFAIS J, BADAWI M, CASSE N, MEZGHANI KHEMAKHEM M. Screening of Helicoverpa armigera Mobilome Revealed Transposable Element Insertions in Insecticide Resistance Genes. INSECTS 2020; 11:insects11120879. [PMID: 33322432 PMCID: PMC7764229 DOI: 10.3390/insects11120879] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 12/08/2020] [Accepted: 12/08/2020] [Indexed: 12/14/2022]
Abstract
Simple Summary Transposable elements (TEs) are mobile DNA sequences that can copy themselves within a host genome. TE-mediated changes in regulation can lead to massive and rapid changes in expression, responses that are potentially highly adaptive when an organism is faced with a mortality agent in the environment, such as an insecticide. Helicoverpa armigera shows a hight number of reported cases of insecticide resistance worldwide, having evolved resistance against pyrethroids, organophosphates, carbamates, organochlorines, and recently to macrocyclic lactone spinosad and several Bacillus thuringiensis toxins. In the present study, we conducted a TE annotation using combined approaches, and the results revealed a total of 8521 TEs, representing 236,132 copies, covering 12.86% of the H. armigera genome. In addition, we underlined TE insertions in defensome genes and we successfully identified nine TE insertions belonging to the RTE, R2, CACTA, Mariner and hAT superfamilies. Abstract The cotton bollworm Helicoverpa armigera Hübner (Lepidoptera: Noctuidae) is an important pest of many crops that has developed resistance to almost all groups of insecticides used for its management. Insecticide resistance was often related to Transposable Element (TE) insertions near specific genes. In the present study, we deeply retrieve and annotate TEs in the H. armigera genome using the Pipeline to Retrieve and Annotate Transposable Elements, PiRATE. The results have shown that the TE library consists of 8521 sequences representing 236,132 TE copies, including 3133 Full-Length Copies (FLC), covering 12.86% of the H. armigera genome. These TEs were classified as 46.71% Class I and 53.29% Class II elements. Among Class I elements, Short and Long Interspersed Nuclear Elements (SINEs and LINEs) are the main families, representing 21.13% and 19.49% of the total TEs, respectively. Long Terminal Repeat (LTR) and Dictyostelium transposable element (DIRS) are less represented, with 5.55% and 0.53%, respectively. Class II elements are mainly Miniature Inverted Transposable Elements (MITEs) (49.11%), then Terminal Inverted Repeats (TIRs) (4.09%). Superfamilies of Class II elements, i.e., Transib, P elements, CACTA, Mutator, PIF-harbinger, Helitron, Maverick, Crypton and Merlin, were less represented, accounting for only 1.96% of total TEs. In addition, we highlighted TE insertions in insecticide resistance genes and we successfully identified nine TE insertions belonging to RTE, R2, CACTA, Mariner and hAT superfamilies. These insertions are hosted in genes encoding cytochrome P450 (CyP450), glutathione S-transferase (GST), and ATP-binding cassette (ABC) transporter belonging to the G and C1 family members. These insertions could therefore be involved in insecticide resistance observed in this pest.
Collapse
Affiliation(s)
- Khouloud KLAI
- Laboratory of Biochemistry and Biotechnology (LR01ES05), Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis 1068, Tunisia; (K.K.); (M.Z.); (S.D.)
- EA2160 Mer Molécules Santé, Le Mans Université, 72085 Le Mans, France; (B.C.); (A.C.); (F.D.); (M.B.)
| | - Benoît CHÉNAIS
- EA2160 Mer Molécules Santé, Le Mans Université, 72085 Le Mans, France; (B.C.); (A.C.); (F.D.); (M.B.)
| | - Marwa ZIDI
- Laboratory of Biochemistry and Biotechnology (LR01ES05), Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis 1068, Tunisia; (K.K.); (M.Z.); (S.D.)
| | - Salma DJEBBI
- Laboratory of Biochemistry and Biotechnology (LR01ES05), Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis 1068, Tunisia; (K.K.); (M.Z.); (S.D.)
| | - Aurore CARUSO
- EA2160 Mer Molécules Santé, Le Mans Université, 72085 Le Mans, France; (B.C.); (A.C.); (F.D.); (M.B.)
| | - Françoise DENIS
- EA2160 Mer Molécules Santé, Le Mans Université, 72085 Le Mans, France; (B.C.); (A.C.); (F.D.); (M.B.)
| | - Johann CONFAIS
- URGI, INRAE, Université Paris-Saclay, 78026 Versailles, France;
- Plant Bioinformatics Facility, BioinfOmics, INRAE, Université Paris-Saclay, 78026 Versailles, France
| | - Myriam BADAWI
- EA2160 Mer Molécules Santé, Le Mans Université, 72085 Le Mans, France; (B.C.); (A.C.); (F.D.); (M.B.)
| | - Nathalie CASSE
- EA2160 Mer Molécules Santé, Le Mans Université, 72085 Le Mans, France; (B.C.); (A.C.); (F.D.); (M.B.)
- Correspondence: (N.C.); (M.M.K.)
| | - Maha MEZGHANI KHEMAKHEM
- Laboratory of Biochemistry and Biotechnology (LR01ES05), Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis 1068, Tunisia; (K.K.); (M.Z.); (S.D.)
- Correspondence: (N.C.); (M.M.K.)
| |
Collapse
|
31
|
Fambrini M, Usai G, Vangelisti A, Mascagni F, Pugliesi C. The plastic genome: The impact of transposable elements on gene functionality and genomic structural variations. Genesis 2020; 58:e23399. [DOI: 10.1002/dvg.23399] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 11/07/2020] [Accepted: 11/10/2020] [Indexed: 12/15/2022]
Affiliation(s)
- Marco Fambrini
- Department of Agriculture, Food and Environment (DAFE) University of Pisa Pisa Italy
| | - Gabriele Usai
- Department of Agriculture, Food and Environment (DAFE) University of Pisa Pisa Italy
| | - Alberto Vangelisti
- Department of Agriculture, Food and Environment (DAFE) University of Pisa Pisa Italy
| | - Flavia Mascagni
- Department of Agriculture, Food and Environment (DAFE) University of Pisa Pisa Italy
| | - Claudio Pugliesi
- Department of Agriculture, Food and Environment (DAFE) University of Pisa Pisa Italy
| |
Collapse
|
32
|
Gonzalez A, Corsini G, Lobos S, Seelenfreund D, Tello M. Metabolic Specialization and Codon Preference of Lignocellulolytic Genes in the White Rot Basidiomycete Ceriporiopsis subvermispora. Genes (Basel) 2020; 11:genes11101227. [PMID: 33092062 PMCID: PMC7588917 DOI: 10.3390/genes11101227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/13/2020] [Accepted: 10/14/2020] [Indexed: 11/16/2022] Open
Abstract
Ceriporiopsis subvermispora is a white-rot fungus with a high specificity towards lignin mineralization when colonizing dead wood or lignocellulosic compounds. Its lignocellulose degrading system is formed by cellulose hydrolytic enzymes, manganese peroxidases, and laccases that catalyze the efficient depolymerization and mineralization of lignocellulose. To determine if this metabolic specialization has modified codon usage of the lignocellulolytic system, improving its adaptation to the fungal translational machine, we analyzed the adaptation to host codon usage (CAI), tRNA pool (tAI, and AAtAI), codon pair bias (CPB), and the number of effective codons (Nc). These indexes were correlated with gene expression of C. subvermispora, in the presence of glucose and Aspen wood. General gene expression was not correlated with the index values. However, in media containing Aspen wood, the induction of expression of lignocellulose-degrading genes, showed significantly (p < 0.001) higher values of CAI, AAtAI, CPB, tAI, and lower values of Nc than non-induced genes. Cellulose-binding proteins and manganese peroxidases presented the highest adaptation values. We also identified an expansion of genes encoding glycine and glutamic acid tRNAs. Our results suggest that the metabolic specialization to use wood as the sole carbon source has introduced a bias in the codon usage of genes involved in lignocellulose degradation. This bias reduces codon diversity and increases codon usage adaptation to the tRNA pool available in C. subvermispora. To our knowledge, this is the first study showing that codon usage is modified to improve the translation efficiency of a group of genes involved in a particular metabolic process.
Collapse
Affiliation(s)
- Alex Gonzalez
- Laboratorio de Microbiología Ambiental y Extremófilos, Departamento de Ciencias Biológicas y Biodiversidad, Universidad de los Lagos, Osorno 5290000, Chile;
| | - Gino Corsini
- Instituto de Ciencias Biomédicas, Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Santiago 8910132, Chile;
| | - Sergio Lobos
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago 8380492, Chile; (S.L.); (D.S.)
| | - Daniela Seelenfreund
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago 8380492, Chile; (S.L.); (D.S.)
| | - Mario Tello
- Laboratorio de Metagenómica Bacteriana, Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170002, Chile
- Correspondence:
| |
Collapse
|
33
|
Reference Genome Assembly for Australian Ascochyta rabiei Isolate ArME14. G3-GENES GENOMES GENETICS 2020; 10:2131-2140. [PMID: 32345704 PMCID: PMC7341154 DOI: 10.1534/g3.120.401265] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Ascochyta rabiei is the causal organism of ascochyta blight of chickpea and is present in chickpea crops worldwide. Here we report the release of a high-quality PacBio genome assembly for the Australian A. rabiei isolate ArME14. We compare the ArME14 genome assembly with an Illumina assembly for Indian A. rabiei isolate, ArD2. The ArME14 assembly has gapless sequences for nine chromosomes with telomere sequences at both ends and 13 large contig sequences that extend to one telomere. The total length of the ArME14 assembly was 40,927,385 bp, which was 6.26 Mb longer than the ArD2 assembly. Division of the genome by OcculterCut into GC-balanced and AT-dominant segments reveals 21% of the genome contains gene-sparse, AT-rich isochores. Transposable elements and repetitive DNA sequences in the ArME14 assembly made up 15% of the genome. A total of 11,257 protein-coding genes were predicted compared with 10,596 for ArD2. Many of the predicted genes missing from the ArD2 assembly were in genomic regions adjacent to AT-rich sequence. We compared the complement of predicted transcription factors and secreted proteins for the two A. rabiei genome assemblies and found that the isolates contain almost the same set of proteins. The small number of differences could represent real differences in the gene complement between isolates or possibly result from the different sequencing methods used. Prediction pipelines were applied for carbohydrate-active enzymes, secondary metabolite clusters and putative protein effectors. We predict that ArME14 contains between 450 and 650 CAZymes, 39 putative protein effectors and 26 secondary metabolite clusters.
Collapse
|
34
|
Kögler A, Seibt KM, Heitkam T, Morgenstern K, Reiche B, Brückner M, Wolf H, Krabel D, Schmidt T. Divergence of 3' ends as a driver of short interspersed nuclear element (SINE) evolution in the Salicaceae. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 103:443-458. [PMID: 32056333 DOI: 10.1111/tpj.14721] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 01/13/2020] [Accepted: 01/29/2020] [Indexed: 06/10/2023]
Abstract
Short interspersed nuclear elements (SINEs) are small, non-autonomous and heterogeneous retrotransposons that are widespread in plants. To explore the amplification dynamics and evolutionary history of SINE populations in representative deciduous tree species, we analyzed the genomes of the six following Salicaceae species: Populus deltoides, Populus euphratica, Populus tremula, Populus tremuloides, Populus trichocarpa, and Salix purpurea. We identified 11 Salicaceae SINE families (SaliS-I to SaliS-XI), comprising 27 077 full-length copies. Most of these families harbor segmental similarities, providing evidence for SINE emergence by reshuffling or heterodimerization. We observed two SINE groups, differing in phylogenetic distribution pattern, similarity and 3' end structure. These groups probably emerged during the 'salicoid duplication' (~65 million years ago) in the Salix-Populus progenitor and during the separation of the genus Salix (45-65 million years ago), respectively. In contrast to conserved 5' start motifs across species and SINE families, the 3' ends are highly variable in sequence and length. This extraordinary 3'-end variability results from mutations in the poly(A) tail, which were fixed by subsequent amplificational bursts. We show that the dissemination of newly evolved 3' ends is accomplished by a displacement of older motifs, leading to various 3'-end subpopulations within the SaliS families.
Collapse
Affiliation(s)
- Anja Kögler
- Faculty of Biology, Institute of Botany, Technische Universität Dresden, 01062, Dresden, Germany
| | - Kathrin M Seibt
- Faculty of Biology, Institute of Botany, Technische Universität Dresden, 01062, Dresden, Germany
| | - Tony Heitkam
- Faculty of Biology, Institute of Botany, Technische Universität Dresden, 01062, Dresden, Germany
| | - Kristin Morgenstern
- Department of Forest Sciences, Institute of Forest Botany and Forest Zoology, Technische Universität Dresden, 01735, Tharandt, Germany
| | - Birgit Reiche
- Department of Forest Sciences, Institute of Forest Botany and Forest Zoology, Technische Universität Dresden, 01735, Tharandt, Germany
| | | | - Heino Wolf
- Staatsbetrieb Sachsenforst, 01796, Pirna, Germany
| | - Doris Krabel
- Department of Forest Sciences, Institute of Forest Botany and Forest Zoology, Technische Universität Dresden, 01735, Tharandt, Germany
| | - Thomas Schmidt
- Faculty of Biology, Institute of Botany, Technische Universität Dresden, 01062, Dresden, Germany
| |
Collapse
|
35
|
Structural and Functional Annotation of Transposable Elements Revealed a Potential Regulation of Genes Involved in Rubber Biosynthesis by TE-Derived siRNA Interference in Hevea brasiliensis. Int J Mol Sci 2020; 21:ijms21124220. [PMID: 32545790 PMCID: PMC7353026 DOI: 10.3390/ijms21124220] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/09/2020] [Accepted: 06/11/2020] [Indexed: 12/14/2022] Open
Abstract
The natural rubber biosynthetic pathway is well described in Hevea, although the final stages of rubber elongation are still poorly understood. Small Rubber Particle Proteins and Rubber Elongation Factors (SRPPs and REFs) are proteins with major function in rubber particle formation and stabilization. Their corresponding genes are clustered on a scaffold1222 of the reference genomic sequence of the Hevea brasiliensis genome. Apart from gene expression by transcriptomic analyses, to date, no deep analyses have been carried out for the genomic environment of SRPPs and REFs loci. By integrative analyses on transposable element annotation, small RNAs production and gene expression, we analysed their role in the control of the transcription of rubber biosynthetic genes. The first in-depth annotation of TEs (Transposable Elements) and their capacity to produce TE-derived siRNAs (small interfering RNAs) is presented, only possible in the Hevea brasiliensis clone PB 260 for which all data are available. We observed that 11% of genes are located near TEs and their presence may interfere in their transcription at both genetic and epigenetic level. We hypothesized that the genomic environment of rubber biosynthesis genes has been shaped by TE and TE-derived siRNAs with possible transcriptional interference on their gene expression. We discussed possible functionalization of TEs as enhancers and as donors of alternative transcription start sites in promoter sequences, possibly through the modelling of genetic and epigenetic landscapes.
Collapse
|
36
|
Bayega A, Djambazian H, Tsoumani KT, Gregoriou ME, Sagri E, Drosopoulou E, Mavragani-Tsipidou P, Giorda K, Tsiamis G, Bourtzis K, Oikonomopoulos S, Dewar K, Church DM, Papanicolaou A, Mathiopoulos KD, Ragoussis J. De novo assembly of the olive fruit fly (Bactrocera oleae) genome with linked-reads and long-read technologies minimizes gaps and provides exceptional Y chromosome assembly. BMC Genomics 2020; 21:259. [PMID: 32228451 PMCID: PMC7106766 DOI: 10.1186/s12864-020-6672-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Accepted: 03/13/2020] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND The olive fruit fly, Bactrocera oleae, is the most important pest in the olive fruit agribusiness industry. This is because female flies lay their eggs in the unripe fruits and upon hatching the larvae feed on the fruits thus destroying them. The lack of a high-quality genome and other genomic and transcriptomic data has hindered progress in understanding the fly's biology and proposing alternative control methods to pesticide use. RESULTS Genomic DNA was sequenced from male and female Demokritos strain flies, maintained in the laboratory for over 45 years. We used short-, mate-pair-, and long-read sequencing technologies to generate a combined male-female genome assembly (GenBank accession GCA_001188975.2). Genomic DNA sequencing from male insects using 10x Genomics linked-reads technology followed by mate-pair and long-read scaffolding and gap-closing generated a highly contiguous 489 Mb genome with a scaffold N50 of 4.69 Mb and L50 of 30 scaffolds (GenBank accession GCA_001188975.4). RNA-seq data generated from 12 tissues and/or developmental stages allowed for genome annotation. Short reads from both males and females and the chromosome quotient method enabled identification of Y-chromosome scaffolds which were extensively validated by PCR. CONCLUSIONS The high-quality genome generated represents a critical tool in olive fruit fly research. We provide an extensive RNA-seq data set, and genome annotation, critical towards gaining an insight into the biology of the olive fruit fly. In addition, elucidation of Y-chromosome sequences will advance our understanding of the Y-chromosome's organization, function and evolution and is poised to provide avenues for sterile insect technique approaches.
Collapse
Affiliation(s)
- Anthony Bayega
- McGill University and Genome Quebec Innovation Centre, Department of Human Genetics, McGill University, Montreal, Canada
| | - Haig Djambazian
- McGill University and Genome Quebec Innovation Centre, Department of Human Genetics, McGill University, Montreal, Canada
| | - Konstantina T. Tsoumani
- Department of Biochemistry and Biotechnology, University of Thessaly, Biopolis, 41500 Larissa, Greece
| | - Maria-Eleni Gregoriou
- Department of Biochemistry and Biotechnology, University of Thessaly, Biopolis, 41500 Larissa, Greece
| | - Efthimia Sagri
- Department of Biochemistry and Biotechnology, University of Thessaly, Biopolis, 41500 Larissa, Greece
| | - Eleni Drosopoulou
- Department of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | | | - Kristina Giorda
- Integrated DNA Technologies, Inc., 1710 Commercial Park, Coralville, Iowa, 52241 USA
| | - George Tsiamis
- Department of Environmental Engineering, University of Patras, Agrinio, Greece
| | - Kostas Bourtzis
- Insect Pest Control Laboratory, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Vienna, Austria
| | - Spyridon Oikonomopoulos
- McGill University and Genome Quebec Innovation Centre, Department of Human Genetics, McGill University, Montreal, Canada
| | - Ken Dewar
- McGill University and Genome Quebec Innovation Centre, Department of Human Genetics, McGill University, Montreal, Canada
| | - Deanna M. Church
- Inscripta, Inc., 5500 Central Avenue #220, Boulder, CO 80301 USA
| | - Alexie Papanicolaou
- Hawkesbury Institute for the Environment, Western Sydney University, Richmond, NSW 2753 Australia
| | - Kostas D. Mathiopoulos
- Department of Biochemistry and Biotechnology, University of Thessaly, Biopolis, 41500 Larissa, Greece
| | - Jiannis Ragoussis
- McGill University and Genome Quebec Innovation Centre, Department of Human Genetics, McGill University, Montreal, Canada
| |
Collapse
|
37
|
Lee RC, Farfan-Caceres LM, Debler JW, Syme RA. Characterization of Growth Morphology and Pathology, and Draft Genome Sequencing of Botrytis fabae, the Causal Organism of Chocolate Spot of Faba Bean ( Vicia faba L.). Front Microbiol 2020; 11:217. [PMID: 32132988 PMCID: PMC7040437 DOI: 10.3389/fmicb.2020.00217] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 01/30/2020] [Indexed: 11/13/2022] Open
Abstract
Chocolate spot is a major fungal disease of faba bean caused by the ascomycete fungus, Botrytis fabae. B. fabae is also implicated in botrytis gray mold disease in lentils, along with B. cinerea. Here we have isolated and characterized two B. fabae isolates from chocolate spot lesions on faba bean leaves. In plant disease assays on faba bean and lentil, B. fabae was more aggressive than B. cinerea and we observed variation in susceptibility among a small set of cultivars for both plant hosts. Using light microscopy, we observed a spreading, generalized necrosis response in faba bean toward B. fabae. In contrast, the plant response to B. cinerea was localized to epidermal cells underlying germinated spores and appressoria. In addition to the species characterization of B. fabae, we produced genome assemblies for both B. fabae isolates using Illumina sequencing. Genome sequencing coverage and assembly size for B. fabae isolates, were 27x and 45x, and 43.2 and 44.5 Mb, respectively. Following genome assembly and annotation, carbohydrate-active enzyme (CAZymes) and effector genes were predicted. There were no major differences in the numbers of each of the major classes of CAZymes. We predicted 29 effector genes for B. fabae, and using the same selection criteria for B. cinerea, we predicted 34 putative effector genes. For five of the predicted effector genes, the pairwise dN/dS ratio between orthologs from B. fabae and B. cinerea was greater than 1.0, suggesting positive selection and the potential evolution of molecular mechanisms for host specificity in B. fabae. Furthermore, a homology search of secondary metabolite clusters revealed the absence of the B. cinerea phytotoxin botrydial and several other uncharacterized secondary metabolite biosynthesis genes from B. fabae. Although there were no obvious differences in the number or proportional representation of different transposable element classes, the overall proportion of AT-rich DNA sequence in B. fabae was double that of B. cinerea.
Collapse
Affiliation(s)
- Robert C Lee
- Centre for Crop and Disease Management, School of Molecular and Life Sciences, Curtin University, Bentley, WA, Australia
| | - Lina M Farfan-Caceres
- Centre for Crop and Disease Management, School of Molecular and Life Sciences, Curtin University, Bentley, WA, Australia
| | - Johannes W Debler
- Centre for Crop and Disease Management, School of Molecular and Life Sciences, Curtin University, Bentley, WA, Australia
| | - Robert A Syme
- Centre for Crop and Disease Management, School of Molecular and Life Sciences, Curtin University, Bentley, WA, Australia
| |
Collapse
|
38
|
Exceptional subgenome stability and functional divergence in the allotetraploid Ethiopian cereal teff. Nat Commun 2020; 11:884. [PMID: 32060277 PMCID: PMC7021729 DOI: 10.1038/s41467-020-14724-z] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Accepted: 01/30/2020] [Indexed: 12/22/2022] Open
Abstract
Teff (Eragrostis tef) is a cornerstone of food security in the Horn of Africa, where it is prized for stress resilience, grain nutrition, and market value. Here, we report a chromosome-scale assembly of allotetraploid teff (variety Dabbi) and patterns of subgenome dynamics. The teff genome contains two complete sets of homoeologous chromosomes, with most genes maintaining as syntenic gene pairs. TE analysis allows us to estimate that the teff polyploidy event occurred ~1.1 million years ago (mya) and that the two subgenomes diverged ~5.0 mya. Despite this divergence, we detect no large-scale structural rearrangements, homoeologous exchanges, or biased gene loss, in contrast to many other allopolyploids. The two teff subgenomes have partitioned their ancestral functions based on divergent expression across a diverse expression atlas. Together, these genomic resources will be useful for accelerating breeding of this underutilized grain crop and for fundamental insights into polyploid genome evolution. Teff is an indigenous cereal critical to food security in the Horn of Africa. Here, the authors report an improved genome assembly and observe the surprisingly low levels of large-scale structural rearrangement, homoeologous exchanges, or bias gene loss after the formation of this tetraploid species.
Collapse
|
39
|
Badet T, Oggenfuss U, Abraham L, McDonald BA, Croll D. A 19-isolate reference-quality global pangenome for the fungal wheat pathogen Zymoseptoria tritici. BMC Biol 2020; 18:12. [PMID: 32046716 PMCID: PMC7014611 DOI: 10.1186/s12915-020-0744-3] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 01/27/2020] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND The gene content of a species largely governs its ecological interactions and adaptive potential. A species is therefore defined by both core genes shared between all individuals and accessory genes segregating presence-absence variation. There is growing evidence that eukaryotes, similar to bacteria, show intra-specific variability in gene content. However, it remains largely unknown how functionally relevant such a pangenome structure is for eukaryotes and what mechanisms underlie the emergence of highly polymorphic genome structures. RESULTS Here, we establish a reference-quality pangenome of a fungal pathogen of wheat based on 19 complete genomes from isolates sampled across six continents. Zymoseptoria tritici causes substantial worldwide losses to wheat production due to rapidly evolved tolerance to fungicides and evasion of host resistance. We performed transcriptome-assisted annotations of each genome to construct a global pangenome. Major chromosomal rearrangements are segregating within the species and underlie extensive gene presence-absence variation. Conserved orthogroups account for only ~ 60% of the species pangenome. Investigating gene functions, we find that the accessory genome is enriched for pathogenesis-related functions and encodes genes involved in metabolite production, host tissue degradation and manipulation of the immune system. De novo transposon annotation of the 19 complete genomes shows that the highly diverse chromosomal structure is tightly associated with transposable element content. Furthermore, transposable element expansions likely underlie recent genome expansions within the species. CONCLUSIONS Taken together, our work establishes a highly complex eukaryotic pangenome providing an unprecedented toolbox to study how pangenome structure impacts crop-pathogen interactions.
Collapse
Affiliation(s)
- Thomas Badet
- Laboratory of Evolutionary Genetics, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
| | - Ursula Oggenfuss
- Laboratory of Evolutionary Genetics, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
| | - Leen Abraham
- Laboratory of Evolutionary Genetics, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
| | - Bruce A McDonald
- Plant Pathology, Institute of Integrative Biology, ETH Zürich, Zürich, Switzerland
| | - Daniel Croll
- Laboratory of Evolutionary Genetics, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland.
| |
Collapse
|
40
|
Badet T, Oggenfuss U, Abraham L, McDonald BA, Croll D. A 19-isolate reference-quality global pangenome for the fungal wheat pathogen Zymoseptoria tritici. BMC Biol 2020; 18:12. [PMID: 32046716 DOI: 10.1101/803098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 01/27/2020] [Indexed: 05/26/2023] Open
Abstract
BACKGROUND The gene content of a species largely governs its ecological interactions and adaptive potential. A species is therefore defined by both core genes shared between all individuals and accessory genes segregating presence-absence variation. There is growing evidence that eukaryotes, similar to bacteria, show intra-specific variability in gene content. However, it remains largely unknown how functionally relevant such a pangenome structure is for eukaryotes and what mechanisms underlie the emergence of highly polymorphic genome structures. RESULTS Here, we establish a reference-quality pangenome of a fungal pathogen of wheat based on 19 complete genomes from isolates sampled across six continents. Zymoseptoria tritici causes substantial worldwide losses to wheat production due to rapidly evolved tolerance to fungicides and evasion of host resistance. We performed transcriptome-assisted annotations of each genome to construct a global pangenome. Major chromosomal rearrangements are segregating within the species and underlie extensive gene presence-absence variation. Conserved orthogroups account for only ~ 60% of the species pangenome. Investigating gene functions, we find that the accessory genome is enriched for pathogenesis-related functions and encodes genes involved in metabolite production, host tissue degradation and manipulation of the immune system. De novo transposon annotation of the 19 complete genomes shows that the highly diverse chromosomal structure is tightly associated with transposable element content. Furthermore, transposable element expansions likely underlie recent genome expansions within the species. CONCLUSIONS Taken together, our work establishes a highly complex eukaryotic pangenome providing an unprecedented toolbox to study how pangenome structure impacts crop-pathogen interactions.
Collapse
Affiliation(s)
- Thomas Badet
- Laboratory of Evolutionary Genetics, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
| | - Ursula Oggenfuss
- Laboratory of Evolutionary Genetics, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
| | - Leen Abraham
- Laboratory of Evolutionary Genetics, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
| | - Bruce A McDonald
- Plant Pathology, Institute of Integrative Biology, ETH Zürich, Zürich, Switzerland
| | - Daniel Croll
- Laboratory of Evolutionary Genetics, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland.
| |
Collapse
|
41
|
Meng H, Feng J, Bai T, Jian Z, Chen Y, Wu G. Genome-wide analysis of short interspersed nuclear elements provides insight into gene and genome evolution in citrus. DNA Res 2020; 27:5818487. [PMID: 32271875 PMCID: PMC7315354 DOI: 10.1093/dnares/dsaa004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Accepted: 04/03/2020] [Indexed: 12/03/2022] Open
Abstract
Short interspersed nuclear elements (SINEs) are non-autonomous retrotransposons that are highly abundant, but not well annotated, in plant genomes. In this study, we identified 41,573 copies of SINEs in seven citrus genomes, including 11,275 full-length copies. The citrus SINEs were distributed among 12 families, with an average full-length rate of 0.27, and were dispersed throughout the chromosomes, preferentially in AT-rich areas. Approximately 18.4% of citrus SINEs were found in close proximity (≤1 kb upstream) to genes, indicating a significant enrichment of SINEs in promoter regions. Citrus SINEs promote gene and genome evolution by offering exons as well as splice sites and start and stop codons, creating novel genes and forming tandem and dispersed repeat structures. Comparative analysis of unique homologous SINE-containing loci (HSCLs) revealed chromosome rearrangements in sweet orange, pummelo, and mandarin, suggesting that unique HSCLs might be valuable for understanding chromosomal abnormalities. This study of SINEs provides us with new perspectives and new avenues by which to understand the evolution of citrus genes and genomes.
Collapse
Affiliation(s)
- Haijun Meng
- College of Horticulture, Henan Agricultural University, Zhengzhou 450002, China
| | - Jiancan Feng
- College of Horticulture, Henan Agricultural University, Zhengzhou 450002, China
| | - Tuanhui Bai
- College of Horticulture, Henan Agricultural University, Zhengzhou 450002, China
| | - Zaihai Jian
- College of Horticulture, Henan Agricultural University, Zhengzhou 450002, China
| | - Yanhui Chen
- College of Horticulture, Henan Agricultural University, Zhengzhou 450002, China
| | - Guoliang Wu
- College of Horticulture, Henan Agricultural University, Zhengzhou 450002, China
| |
Collapse
|
42
|
Seibt KM, Schmidt T, Heitkam T. The conserved 3' Angio-domain defines a superfamily of short interspersed nuclear elements (SINEs) in higher plants. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 101:681-699. [PMID: 31610059 DOI: 10.1111/tpj.14567] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 09/13/2019] [Accepted: 09/17/2019] [Indexed: 06/10/2023]
Abstract
Repetitive sequences are ubiquitous components of eukaryotic genomes affecting genome size and evolution as well as gene regulation. Among them, short interspersed nuclear elements (SINEs) are non-coding retrotransposons usually shorter than 1000 bp. They contain only few short conserved structural motifs, in particular an internal promoter derived from cellular RNAs and a mostly AT-rich 3' tail, whereas the remaining regions are highly variable. SINEs emerge and vanish during evolution, and often diversify into numerous families and subfamilies that are usually specific for only a limited number of species. In contrast, at the 3' end of multiple plant SINEs we detected the highly conserved 'Angio-domain'. This 37 bp segment defines the Angio-SINE superfamily, which encompasses 24 plant SINE families widely distributed across 13 orders within the plant kingdom. We retrieved 28 433 full-length Angio-SINE copies from genome assemblies of 46 plant species, frequently located in genes. Compensatory mutations in and adjacent to the Angio-domain imply selective restraints maintaining its RNA structure. Angio-SINE families share segmental sequence similarities, indicating a modular evolution with strong Angio-domain preservation. We suggest that the conserved domain contributes to the evolutionary success of Angio-SINEs through either structural interactions between SINE RNA and proteins increasing their transpositional efficiency, or by enhancing their accumulation in genes.
Collapse
Affiliation(s)
- Kathrin M Seibt
- Faculty of Biology, Technische Universität Dresden, Zellescher Weg 20b, Dresden, 01217, Germany
| | - Thomas Schmidt
- Faculty of Biology, Technische Universität Dresden, Zellescher Weg 20b, Dresden, 01217, Germany
| | - Tony Heitkam
- Faculty of Biology, Technische Universität Dresden, Zellescher Weg 20b, Dresden, 01217, Germany
| |
Collapse
|
43
|
Long-read sequencing reveals genomic structural variations that underlie creation of quality protein maize. Nat Commun 2020; 11:17. [PMID: 31911615 PMCID: PMC6946643 DOI: 10.1038/s41467-019-14023-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 12/12/2019] [Indexed: 02/05/2023] Open
Abstract
Mutation of o2 doubles maize endosperm lysine content, but it causes an inferior kernel phenotype. Developing quality protein maize (QPM) by introgressing o2 modifiers (Mo2s) into the o2 mutant benefits millions of people in developing countries where maize is a primary protein source. Here, we report genome sequence and annotation of a South African QPM line K0326Y, which is assembled from single-molecule, real-time shotgun sequencing reads collinear with an optical map. We achieve a N50 contig length of 7.7 million bases (Mb) directly from long-read assembly, compared to those of 1.04 Mb for B73 and 1.48 Mb for Mo17. To characterize Mo2s, we map QTLs to chromosomes 1, 6, 7, and 9 using an F2 population derived from crossing K0326Y and W64Ao2. RNA-seq analysis of QPM and o2 endosperms reveals a group of differentially expressed genes that coincide with Mo2 QTLs, suggesting a potential role in vitreous endosperm formation. The South African quality protein maize (QPM) cultivars have the desired high lysine content and kernel hardness due to o2 mutation and the introgression of modifiers of o2 (Mo2) QTLs, respectively. Here, the authors assemble the genome of a QPM line and identify candidate genes underlying Mo2 QTLs.
Collapse
|
44
|
Anderson SN, Stitzer MC, Brohammer AB, Zhou P, Noshay JM, O'Connor CH, Hirsch CD, Ross-Ibarra J, Hirsch CN, Springer NM. Transposable elements contribute to dynamic genome content in maize. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2019; 100:1052-1065. [PMID: 31381222 DOI: 10.1111/tpj.14489] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 07/15/2019] [Accepted: 07/26/2019] [Indexed: 05/05/2023]
Abstract
Transposable elements (TEs) are ubiquitous components of eukaryotic genomes and can create variation in genome organization and content. Most maize genomes are composed of TEs. We developed an approach to define shared and variable TE insertions across genome assemblies and applied this method to four maize genomes (B73, W22, Mo17 and PH207) with uniform structural annotations of TEs. Among these genomes we identified approximately 400 000 TEs that are polymorphic, encompassing 1.6 Gb of variable TE sequence. These polymorphic TEs include a combination of recent transposition events as well as deletions of older TEs. There are examples of polymorphic TEs within each of the superfamilies of TEs and they are found distributed across the genome, including in regions of recent shared ancestry among individuals. There are many examples of polymorphic TEs within or near maize genes. In addition, there are 2380 gene annotations in the B73 genome that are located within variable TEs, providing evidence for the role of TEs in contributing to the substantial differences in annotated gene content among these genotypes. TEs are highly variable in our survey of four temperate maize genomes, highlighting the major contribution of TEs in driving variation in genome organization and gene content. OPEN RESEARCH BADGES: This article has earned an Open Data Badge for making publicly available the digitally-shareable data necessary to reproduce the reported results. The data is available at https://github.com/SNAnderson/maizeTE_variation; https://mcstitzer.github.io/maize_TEs.
Collapse
Affiliation(s)
- Sarah N Anderson
- Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN, 55108, USA
| | - Michelle C Stitzer
- Department of Plant Sciences and Center for Population Biology, University of California, Davis, CA, 95616, USA
| | - Alex B Brohammer
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, 55108, USA
| | - Peng Zhou
- Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN, 55108, USA
| | - Jaclyn M Noshay
- Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN, 55108, USA
| | - Christine H O'Connor
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, 55108, USA
| | - Cory D Hirsch
- Department of Plant Pathology, University of Minnesota, St. Paul, MN, 55108, USA
| | - Jeffrey Ross-Ibarra
- Department of Plant Sciences and Center for Population Biology, University of California, Davis, CA, 95616, USA
- Genome Center, University of California, Davis, CA, 95616, USA
| | - Candice N Hirsch
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, 55108, USA
| | - Nathan M Springer
- Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN, 55108, USA
| |
Collapse
|
45
|
Plant evolution and environmental adaptation unveiled by long-read whole-genome sequencing of Spirodela. Proc Natl Acad Sci U S A 2019; 116:18893-18899. [PMID: 31484765 DOI: 10.1073/pnas.1910401116] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Aquatic plants have to adapt to the environments distinct from where land plants grow. A critical aspect of adaptation is the dynamics of sequence repeats, not resolved in older sequencing platforms due to incomplete and fragmented genome assemblies from short reads. Therefore, we used PacBio long-read sequencing of the Spirodela polyrhiza genome, reaching a 44-fold increase of contiguity with an N50 (a median of contig lengths) of 831 kb and filling 95.4% of gaps left from the previous version. Reconstruction of repeat regions indicates that sequentially nested long terminal repeat (LTR) retrotranspositions occur early in monocot evolution, featured with both prokaryote-like gene-rich regions and eukaryotic repeat islands. Protein-coding genes are reduced to 18,708 gene models supported by 492,435 high-quality full-length PacBio complementary DNA (cDNA) sequences. Different from land plants, the primitive architecture of Spirodela's adventitious roots and lack of lateral roots and root hairs are consistent with dispensable functions of nutrient absorption. Disease-resistant genes encoding antimicrobial peptides and dirigent proteins are expanded by tandem duplications. Remarkably, disease-resistant genes are not only amplified, but also highly expressed, consistent with low levels of 24-nucleotide (nt) small interfering RNA (siRNA) that silence the immune system of land plants, thereby protecting Spirodela against a wide spectrum of pathogens and pests. The long-read sequence information not only sheds light on plant evolution and adaptation to the environment, but also facilitates applications in bioenergy and phytoremediation.
Collapse
|
46
|
Genome assembly of a tropical maize inbred line provides insights into structural variation and crop improvement. Nat Genet 2019; 51:1052-1059. [DOI: 10.1038/s41588-019-0427-6] [Citation(s) in RCA: 133] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 04/25/2019] [Indexed: 01/15/2023]
|
47
|
Massive Changes of Genome Size Driven by Expansions of Non-autonomous Transposable Elements. Curr Biol 2019; 29:1161-1168.e6. [DOI: 10.1016/j.cub.2019.01.080] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Revised: 11/26/2018] [Accepted: 01/31/2019] [Indexed: 01/08/2023]
|
48
|
Mhiri C, Parisod C, Daniel J, Petit M, Lim KY, Dorlhac de Borne F, Kovarik A, Leitch AR, Grandbastien MA. Parental transposable element loads influence their dynamics in young Nicotiana hybrids and allotetraploids. THE NEW PHYTOLOGIST 2019; 221:1619-1633. [PMID: 30220091 DOI: 10.1111/nph.15484] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 09/06/2018] [Indexed: 05/29/2023]
Abstract
The genomic shock hypothesis suggests that allopolyploidy is associated with genome changes driven by transposable elements, as a response to imbalances between parental insertion loads. To explore this hypothesis, we compared three allotetraploids, Nicotiana arentsii, N. rustica and N. tabacum, which arose over comparable time frames from hybridisation between increasingly divergent diploid species. We used sequence-specific amplification polymorphism (SSAP) to compare the dynamics of six transposable elements in these allopolyploids, their diploid progenitors and in corresponding synthetic hybrids. We show that element-specific dynamics in young Nicotiana allopolyploids reflect their dynamics in diploid progenitors. Transposable element mobilisation is not concomitant with immediate genome merger, but occurs within the first generations of allopolyploid formation. In natural allopolyploids, such mobilisations correlate with imbalances in the repeat profile of the parental species, which increases with their genetic divergence. Other restructuring leading to locus loss is immediate, nonrandom and targeted at specific subgenomes, independently of cross orientation. The correlation between transposable element mobilisation in allopolyploids and quantitative imbalances in parental transposable element loads supports the genome shock hypothesis proposed by McClintock.
Collapse
Affiliation(s)
- Corinne Mhiri
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, 78000, Versailles, France
| | - Christian Parisod
- Ecological Genomics, Institute of Plant Sciences, University of Bern, Bern, CH-3013, Switzerland
| | - Julien Daniel
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, 78000, Versailles, France
| | - Maud Petit
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, 78000, Versailles, France
| | - K Yoong Lim
- School of Biological and Chemical Sciences, Queen Mary University of London, London, E1 4NS, UK
| | | | - Ales Kovarik
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, CZ-61265, Czech Republic
| | - Andrew R Leitch
- School of Biological and Chemical Sciences, Queen Mary University of London, London, E1 4NS, UK
| | - Marie-Angèle Grandbastien
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, 78000, Versailles, France
| |
Collapse
|
49
|
Zhu T, Wang L, You FM, Rodriguez JC, Deal KR, Chen L, Li J, Chakraborty S, Balan B, Jiang CZ, Brown PJ, Leslie CA, Aradhya MK, Dandekar AM, McGuire PE, Kluepfel D, Dvorak J, Luo MC. Sequencing a Juglans regia × J. microcarpa hybrid yields high-quality genome assemblies of parental species. HORTICULTURE RESEARCH 2019; 6:55. [PMID: 30937174 PMCID: PMC6431679 DOI: 10.1038/s41438-019-0139-1] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 03/09/2019] [Accepted: 03/10/2019] [Indexed: 05/22/2023]
Abstract
Members of the genus Juglans are monecious wind-pollinated trees in the family Juglandaceae with highly heterozygous genomes, which greatly complicates genome sequence assembly. The genomes of interspecific hybrids are usually comprised of haploid genomes of parental species. We exploited this attribute of interspecific hybrids to avoid heterozygosity and sequenced an interspecific hybrid Juglans microcarpa × J. regia using a novel combination of single-molecule sequencing and optical genome mapping technologies. The resulting assemblies of both genomes were remarkably complete including chromosome termini and centromere regions. Chromosome termini consisted of arrays of telomeric repeats about 8 kb long and heterochromatic subtelomeric regions about 10 kb long. The centromeres consisted of arrays of a centromere-specific Gypsy retrotransposon and most contained genes, many of them transcribed. Juglans genomes evolved by a whole-genome-duplication dating back to the Cretaceous-Paleogene boundary and consist of two subgenomes, which were fractionated by numerous short gene deletions evenly distributed along the length of the chromosomes. Fractionation was shown to be asymmetric with one subgenome exhibiting greater gene loss than the other. The asymmetry of the process is ongoing and mirrors an asymmetry in gene expression between the subgenomes. Given the importance of J. microcarpa × J. regia hybrids as potential walnut rootstocks, we catalogued disease resistance genes in the parental genomes and studied their chromosomal distribution. We also estimated the molecular clock rates for woody perennials and deployed them in estimating divergence times of Juglans genomes and those of other woody perennials.
Collapse
Affiliation(s)
- Tingting Zhu
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | - Le Wang
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | - Frank M. You
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6 Canada
| | - Juan C. Rodriguez
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | - Karin R. Deal
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | - Limin Chen
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | - Jie Li
- Genome Center, University of California, Davis, CA 95616 USA
| | | | - Bipin Balan
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | - Cai-Zhong Jiang
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
- Crops Pathology and Genetics Research Unit, USDA-ARS, Davis, CA 95616 USA
| | - Patrick J. Brown
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | - Charles A. Leslie
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | | | - Abhaya M. Dandekar
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | - Patrick E. McGuire
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | - Daniel Kluepfel
- Crops Pathology and Genetics Research Unit, USDA-ARS, Davis, CA 95616 USA
| | - Jan Dvorak
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | - Ming-Cheng Luo
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| |
Collapse
|
50
|
Nishiyama E, Ohshima K. Cross-Kingdom Commonality of a Novel Insertion Signature of RTE-Related Short Retroposons. Genome Biol Evol 2018; 10:1471-1483. [PMID: 29850801 PMCID: PMC6007223 DOI: 10.1093/gbe/evy098] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/18/2018] [Indexed: 12/15/2022] Open
Abstract
In multicellular organisms, such as vertebrates and flowering plants, horizontal transfer (HT) of genetic information is thought to be a rare event. However, recent findings unveiled unexpectedly frequent HT of RTE-clade LINEs. To elucidate the molecular footprints of the genomic integration machinery of RTE-related retroposons, the sequence patterns surrounding the insertion sites of plant Au-like SINE families were analyzed in the genomes of a wide variety of flowering plants. A novel and remarkable finding regarding target site duplications (TSDs) for SINEs was they start with thymine approximately one helical pitch (ten nucleotides) downstream of a thymine stretch. This TSD pattern was found in RTE-clade LINEs, which share the 3'-end sequence of these SINEs, in the genome of leguminous plants. These results demonstrably show that Au-like SINEs were mobilized by the enzymatic machinery of RTE-clade LINEs. Further, we discovered the same TSD pattern in animal SINEs from lizard and mammals, in which the RTE-clade LINEs sharing the 3'-end sequence with these animal SINEs showed a distinct TSD pattern. Moreover, a significant correlation was observed between the first nucleotide of TSDs and microsatellite-like sequences found at the 3'-ends of SINEs and LINEs. We propose that RTE-encoded protein could preferentially bind to a DNA region that contains a thymine stretch to cleave a phosphodiester bond downstream of the stretch. Further, determination of cleavage sites and/or efficiency of primer sites for reverse transcription may depend on microsatellite-like repeats in the RNA template. Such a unique mechanism may have enabled retroposons to successfully expand in frontier genomes after HT.
Collapse
Affiliation(s)
- Eri Nishiyama
- Graduate School of Bioscience, Nagahama Institute of Bio-Science and Technology, Shiga, Japan
| | - Kazuhiko Ohshima
- Graduate School of Bioscience, Nagahama Institute of Bio-Science and Technology, Shiga, Japan
| |
Collapse
|