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Mason B, Hayward DC, Moya A, Cooke I, Sorenson A, Brunner R, Andrade N, Huerlimann R, Bourne DG, Schaeffer P, Grinblat M, Ravasi T, Ueda N, Tang SL, Ball EE, Miller DJ. Microbiome manipulation by corals and other Cnidaria via quorum quenching. Curr Biol 2024; 34:3226-3232.e5. [PMID: 38942019 DOI: 10.1016/j.cub.2024.05.073] [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: 11/29/2023] [Revised: 05/03/2024] [Accepted: 05/30/2024] [Indexed: 06/30/2024]
Abstract
A dynamic mucous layer containing numerous micro-organisms covers the surface of corals and has multiple functions including both removal of sediment and "food gathering."1 It is likely to also act as the primary barrier to infection; various proteins and compounds with antimicrobial activity have been identified in coral mucus, though these are thought to be largely or exclusively of microbial origin. As in Hydra,2 anti-microbial peptides (AMPs) are likely to play major roles in regulating the microbiomes of corals.3,4 Some eukaryotes employ a complementary but less obvious approach to manipulate their associated microbiome by interfering with quorum signaling, effectively preventing bacteria from coordinating gene expression across a population. Our investigation of immunity in the reef-building coral Acropora millepora,5 however, led to the discovery of a coral gene referred to here as AmNtNH1 that can inactivate a range of acyl homoserine lactones (AHLs), common bacterial quorum signaling molecules, and is induced on immune challenge of adult corals and expressed during the larval settlement process. Closely related proteins are widely distributed within the Scleractinia (hard corals) and some other cnidarians, with multiple paralogs in Acropora, but their closest relatives are bacterial, implying that these are products of one or more lateral gene transfer events post-dating the cnidarian-bilaterian divergence. The deployment by corals of genes used by bacteria to compete with other bacteria reflects a mechanism of microbiome manipulation previously unknown in Metazoa but that may apply more generally.
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Affiliation(s)
- Benjamin Mason
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia
| | - David C Hayward
- Research School of Biology, Australian National University, Acton, ACT 2601, Australia
| | - Aurelie Moya
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia
| | - Ira Cooke
- Centre for Tropical Bioinformatics and Molecular Biology, James Cook University, Townsville, QLD 4811, Australia
| | - Alanna Sorenson
- Centre for Tropical Bioinformatics and Molecular Biology, James Cook University, Townsville, QLD 4811, Australia
| | - Ramona Brunner
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia; Marine Climate Change Unit, Okinawa Institute of Science and Technology (OIST), 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
| | - Natalia Andrade
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia; Marine Climate Change Unit, Okinawa Institute of Science and Technology (OIST), 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
| | - Roger Huerlimann
- Marine Climate Change Unit, Okinawa Institute of Science and Technology (OIST), 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
| | - David G Bourne
- Centre for Sustainable Tropical Fisheries and Aquaculture, College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia
| | - Patrick Schaeffer
- Centre for Tropical Bioinformatics and Molecular Biology, James Cook University, Townsville, QLD 4811, Australia
| | - Mila Grinblat
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia; Marine Climate Change Unit, Okinawa Institute of Science and Technology (OIST), 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
| | - Timothy Ravasi
- Marine Climate Change Unit, Okinawa Institute of Science and Technology (OIST), 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
| | - Nobuo Ueda
- Marine Science Section, Okinawa Institute of Science and Technology (OIST), 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
| | - Sen-Lin Tang
- Biodiversity Research Center, Academia Sinica, Taipei 15529, Taiwan
| | - Eldon E Ball
- Research School of Biology, Australian National University, Acton, ACT 2601, Australia.
| | - David J Miller
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia; Centre for Tropical Bioinformatics and Molecular Biology, James Cook University, Townsville, QLD 4811, Australia; Marine Climate Change Unit, Okinawa Institute of Science and Technology (OIST), 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan.
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Marulanda-Gomez AM, Ribes M, Franzenburg S, Hentschel U, Pita L. Transcriptomic responses of Mediterranean sponges upon encounter with symbiont microbial consortia. BMC Genomics 2024; 25:674. [PMID: 38972970 PMCID: PMC11229196 DOI: 10.1186/s12864-024-10548-z] [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: 03/06/2024] [Accepted: 06/21/2024] [Indexed: 07/09/2024] Open
Abstract
BACKGROUND Sponges (phylum Porifera) constantly interact with microbes. They graze on microbes from the water column by filter-feeding and they harbor symbiotic partners within their bodies. In experimental setups, sponges take up symbionts at lower rates compared with seawater microbes. This suggests that sponges have the capacity to differentiate between microbes and preferentially graze in non-symbiotic microbes, although the underlying mechanisms of discrimination are still poorly understood. Genomic studies showed that, compared to other animal groups, sponges present an extended repertoire of immune receptors, in particular NLRs, SRCRs, and GPCRs, and a handful of experiments showed that sponges regulate the expression of these receptors upon encounter with microbial elicitors. We hypothesize that sponges may rely on differential expression of their diverse repertoire of poriferan immune receptors to sense different microbial consortia while filter-feeding. To test this, we characterized the transcriptomic response of two sponge species, Aplysina aerophoba and Dysidea avara, upon incubation with microbial consortia extracted from A. aerophoba in comparison with incubation with seawater microbes. The sponges were sampled after 1 h, 3 h, and 5 h for RNA-Seq differential gene expression analysis. RESULTS D. avara incubated with A. aerophoba-symbionts regulated the expression of genes related to immunity, ubiquitination, and signaling. Within the set of differentially-expressed immune genes we identified different families of Nucleotide Oligomerization Domain (NOD)-Like Receptors (NLRs). These results represent the first experimental evidence that different types of NLRs are involved in microbial discrimination in a sponge. In contrast, the transcriptomic response of A. aerophoba to its own symbionts involved comparatively fewer genes and lacked genes encoding for immune receptors. CONCLUSION Our work suggests that: (i) the transcriptomic response of sponges upon microbial exposure may imply "fine-tuning" of baseline gene expression as a result of their interaction with microbes, (ii) the differential response of sponges to microbial encounters varied between the species, probably due to species-specific characteristics or related to host's traits, and (iii) immune receptors belonging to different families of NLR-like genes played a role in the differential response to microbes, whether symbionts or food bacteria. The regulation of these receptors in sponges provides further evidence of the potential role of NLRs in invertebrate host-microbe interactions. The study of sponge responses to microbes exemplifies how investigating different animal groups broadens our knowledge of the evolution of immune specificity and symbiosis.
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Affiliation(s)
| | - Marta Ribes
- Institut de Ciències del Mar, ICM - CSIC, Barcelona, Spain
| | - Sören Franzenburg
- Research Group Genetics and Bioinformatics/Systems Immunology, Institute of Clinical Molecular Biology, Christian-Albrechts-Universität Kiel, Kiel, Germany
| | - Ute Hentschel
- RD3 Marine Ecology, RU Marine Symbioses, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
- Christian-Albrechts-Universität Kiel, Kiel, Germany
| | - Lucia Pita
- Institut de Ciències del Mar, ICM - CSIC, Barcelona, Spain.
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Mohamed AR, Ochsenkühn MA, Kazlak AM, Moustafa A, Amin SA. The coral microbiome: towards an understanding of the molecular mechanisms of coral-microbiota interactions. FEMS Microbiol Rev 2023; 47:fuad005. [PMID: 36882224 PMCID: PMC10045912 DOI: 10.1093/femsre/fuad005] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 02/10/2023] [Accepted: 02/15/2023] [Indexed: 03/09/2023] Open
Abstract
Corals live in a complex, multipartite symbiosis with diverse microbes across kingdoms, some of which are implicated in vital functions, such as those related to resilience against climate change. However, knowledge gaps and technical challenges limit our understanding of the nature and functional significance of complex symbiotic relationships within corals. Here, we provide an overview of the complexity of the coral microbiome focusing on taxonomic diversity and functions of well-studied and cryptic microbes. Mining the coral literature indicate that while corals collectively harbour a third of all marine bacterial phyla, known bacterial symbionts and antagonists of corals represent a minute fraction of this diversity and that these taxa cluster into select genera, suggesting selective evolutionary mechanisms enabled these bacteria to gain a niche within the holobiont. Recent advances in coral microbiome research aimed at leveraging microbiome manipulation to increase coral's fitness to help mitigate heat stress-related mortality are discussed. Then, insights into the potential mechanisms through which microbiota can communicate with and modify host responses are examined by describing known recognition patterns, potential microbially derived coral epigenome effector proteins and coral gene regulation. Finally, the power of omics tools used to study corals are highlighted with emphasis on an integrated host-microbiota multiomics framework to understand the underlying mechanisms during symbiosis and climate change-driven dysbiosis.
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Affiliation(s)
- Amin R Mohamed
- Biology Program, New York University Abu Dhabi, Abu Dhabi 129188, United Arab Emirates
| | - Michael A Ochsenkühn
- Biology Program, New York University Abu Dhabi, Abu Dhabi 129188, United Arab Emirates
| | - Ahmed M Kazlak
- Systems Genomics Laboratory, American University in Cairo, New Cairo 11835, Egypt
- Biotechnology Graduate Program, American University in Cairo, New Cairo 11835, Egypt
| | - Ahmed Moustafa
- Systems Genomics Laboratory, American University in Cairo, New Cairo 11835, Egypt
- Biotechnology Graduate Program, American University in Cairo, New Cairo 11835, Egypt
- Department of Biology, American University in Cairo, New Cairo 11835, Egypt
| | - Shady A Amin
- Biology Program, New York University Abu Dhabi, Abu Dhabi 129188, United Arab Emirates
- Center for Genomics and Systems Biology (CGSB), New York University Abu Dhabi, Abu Dhabi 129188, United Arab Emirates
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Kumar L, Brenner N, Sledzieski S, Olaosebikan M, Roger LM, Lynn-Goin M, Klein-Seetharaman R, Berger B, Putnam H, Yang J, Lewinski NA, Singh R, Daniels NM, Cowen L, Klein-Seetharaman J. Transfer of knowledge from model organisms to evolutionarily distant non-model organisms: The coral Pocillopora damicornis membrane signaling receptome. PLoS One 2023; 18:e0270965. [PMID: 36735673 PMCID: PMC9897584 DOI: 10.1371/journal.pone.0270965] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 06/21/2022] [Indexed: 02/04/2023] Open
Abstract
With the ease of gene sequencing and the technology available to study and manipulate non-model organisms, the extension of the methodological toolbox required to translate our understanding of model organisms to non-model organisms has become an urgent problem. For example, mining of large coral and their symbiont sequence data is a challenge, but also provides an opportunity for understanding functionality and evolution of these and other non-model organisms. Much more information than for any other eukaryotic species is available for humans, especially related to signal transduction and diseases. However, the coral cnidarian host and human have diverged over 700 million years ago and homologies between proteins in the two species are therefore often in the gray zone, or at least often undetectable with traditional BLAST searches. We introduce a two-stage approach to identifying putative coral homologues of human proteins. First, through remote homology detection using Hidden Markov Models, we identify candidate human homologues in the cnidarian genome. However, for many proteins, the human genome alone contains multiple family members with similar or even more divergence in sequence. In the second stage, therefore, we filter the remote homology results based on the functional and structural plausibility of each coral candidate, shortlisting the coral proteins likely to have conserved some of the functions of the human proteins. We demonstrate our approach with a pipeline for mapping membrane receptors in humans to membrane receptors in corals, with specific focus on the stony coral, P. damicornis. More than 1000 human membrane receptors mapped to 335 coral receptors, including 151 G protein coupled receptors (GPCRs). To validate specific sub-families, we chose opsin proteins, representative GPCRs that confer light sensitivity, and Toll-like receptors, representative non-GPCRs, which function in the immune response, and their ability to communicate with microorganisms. Through detailed structure-function analysis of their ligand-binding pockets and downstream signaling cascades, we selected those candidate remote homologues likely to carry out related functions in the corals. This pipeline may prove generally useful for other non-model organisms, such as to support the growing field of synthetic biology.
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Affiliation(s)
- Lokender Kumar
- Department of Chemistry, Colorado School of Mines, Golden, CO, United States of America
| | - Nathanael Brenner
- Department of Chemistry, Colorado School of Mines, Golden, CO, United States of America
| | - Samuel Sledzieski
- MIT Computer Science & Artificial Intelligence Lab, Massachusetts Institute of Technology, Cambridge, MA, United States of America
| | - Monsurat Olaosebikan
- Department of Computer Science, Tufts University, Medford, MA, United States of America
| | - Liza M. Roger
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, VA, United States of America
| | - Matthew Lynn-Goin
- Department of Chemistry, Colorado School of Mines, Golden, CO, United States of America
| | | | - Bonnie Berger
- MIT Computer Science & Artificial Intelligence Lab, Massachusetts Institute of Technology, Cambridge, MA, United States of America
| | - Hollie Putnam
- Department of Biological Sciences, University of Rhode Island, South Kingstown, RI, United States of America
| | - Jinkyu Yang
- Department of Department of Aeronautics & Astronautics, University of Washington, Seattle, WA, United States of America
| | - Nastassja A. Lewinski
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, VA, United States of America
| | - Rohit Singh
- MIT Computer Science & Artificial Intelligence Lab, Massachusetts Institute of Technology, Cambridge, MA, United States of America
| | - Noah M. Daniels
- Department of Computer Science and Statistics, University of Rhode Island, South Kingstown, RI, United States of America
| | - Lenore Cowen
- Department of Computer Science, Tufts University, Medford, MA, United States of America
| | - Judith Klein-Seetharaman
- Department of Chemistry, Colorado School of Mines, Golden, CO, United States of America
- * E-mail:
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5
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Yao S, Li L, Guan X, He Y, Jouaux A, Xu F, Guo X, Zhang G, Zhang L. Pooled resequencing of larvae and adults reveals genomic variations associated with Ostreid herpesvirus 1 resistance in the Pacific oyster Crassostrea gigas. Front Immunol 2022; 13:928628. [PMID: 36059443 PMCID: PMC9437489 DOI: 10.3389/fimmu.2022.928628] [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: 04/26/2022] [Accepted: 07/29/2022] [Indexed: 11/30/2022] Open
Abstract
The Ostreid herpesvirus 1 (OsHV-1) is a lethal pathogen of the Pacific oyster (Crassostrea gigas), an important aquaculture species. To understand the genetic architecture of the defense against the pathogen, we studied genomic variations associated with herpesvirus-caused mortalities by pooled whole-genome resequencing of before and after-mortality larval samples as well as dead and surviving adults from a viral challenge. Analysis of the resequencing data identified 5,271 SNPs and 1,883 genomic regions covering 3,111 genes in larvae, and 18,692 SNPs and 28,314 regions covering 4,863 genes in adults that were significantly associated with herpesvirus-caused mortalities. Only 1,653 of the implicated genes were shared by larvae and adults, suggesting that the antiviral response or resistance in larvae and adults involves different sets of genes or differentiated members of expanded gene families. Combined analyses with previous transcriptomic data from challenge experiments revealed that transcription of many mortality-associated genes was also significantly upregulated by herpesvirus infection confirming their importance in antiviral response. Key immune response genes especially those encoding antiviral receptors such as TLRs and RLRs displayed strong association between variation in regulatory region and herpesvirus-caused mortality, suggesting they may confer resistance through transcriptional modulation. These results point to previously undescribed genetic mechanisms for disease resistance at different developmental stages and provide candidate polymorphisms and genes that are valuable for understanding antiviral immune responses and breeding for herpesvirus resistance.
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Affiliation(s)
- Shanshan Yao
- Chinese Academy of Sciences (CAS) and Shandong Province Key Laboratory of Experimental Marine Biology and Center of Deep Sea Research, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
- College of Life Sciences, Qingdao University, Qingdao, China
| | - Li Li
- Chinese Academy of Sciences (CAS) and Shandong Province Key Laboratory of Experimental Marine Biology and Center of Deep Sea Research, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
- University of Chinese Academy of Sciences, College of Marine Science, Beijing, China
| | - Xudong Guan
- Chinese Academy of Sciences (CAS) and Shandong Province Key Laboratory of Experimental Marine Biology and Center of Deep Sea Research, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
| | - Yan He
- Ministry of Education (MOE) Key Laboratory of Molecular Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Aude Jouaux
- UMR BOREA, “Biologie des Organismes et Ecosystèmes Aquatiques”, MNHN, UPMC, UCBN, CNRS-7208, IRD, Université de Caen Basse-Normandie, Esplanade de la Paix, Caen, France
| | - Fei Xu
- Chinese Academy of Sciences (CAS) and Shandong Province Key Laboratory of Experimental Marine Biology and Center of Deep Sea Research, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
| | - Ximing Guo
- Haskin Shellfish Research Laboratory, Department of Marine and Coastal Sciences, Rutgers University, Port Norris, NJ, United States
- *Correspondence: Ximing Guo, ; Guofan Zhang, ; Linlin Zhang,
| | - Guofan Zhang
- Chinese Academy of Sciences (CAS) and Shandong Province Key Laboratory of Experimental Marine Biology and Center of Deep Sea Research, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
- University of Chinese Academy of Sciences, College of Marine Science, Beijing, China
- *Correspondence: Ximing Guo, ; Guofan Zhang, ; Linlin Zhang,
| | - Linlin Zhang
- Chinese Academy of Sciences (CAS) and Shandong Province Key Laboratory of Experimental Marine Biology and Center of Deep Sea Research, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
- University of Chinese Academy of Sciences, College of Marine Science, Beijing, China
- *Correspondence: Ximing Guo, ; Guofan Zhang, ; Linlin Zhang,
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6
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Blasi G, Bortoletto E, Gasparotto M, Filippini F, Bai CM, Rosani U, Venier P. A glimpse on metazoan ZNFX1 helicases, ancient players of antiviral innate immunity. FISH & SHELLFISH IMMUNOLOGY 2022; 121:456-466. [PMID: 35063603 DOI: 10.1016/j.fsi.2022.01.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 12/03/2021] [Accepted: 01/13/2022] [Indexed: 06/14/2023]
Abstract
The human zinc finger NFX1-type containing 1 (ZNFX1) is an interferon-stimulated protein associated to the outer mitochondrial membrane, able to bind dsRNAs and interact with MAVS proteins, promoting type I IFN response in the early stage of viral infection. An N-terminal Armadillo (ARM)-type fold and a large helicase core (P-loop) and zinc fingers confer RNA-binding and ATPase activities to ZNFX1. We studied the phylogenetic distribution of metazoan ZNFX1s, ZNFX1 gene expression trends and genomic and protein signatures during viral infection of invertebrates. Based on 221 ZNFX1 sequences, we obtained a polyphyletic tree with a taxonomy-consistent branching at the phylum-level only. In metazoan genomes, ZNFX1 genes were found either in single copy, with up to some tens of exons in vertebrates, or in multiple copies, with one or a few exons and one of them sometimes encompassing most of the coding sequence, in invertebrates like sponges, sea urchins and mollusks. Structural analyses of selected ZNFX1 proteins showed high conservation of the helicase region (P-loop), an overall conserved region and domain architecture, an ARM-fold mostly traceable, and the presence of intrinsically disordered regions of varying length and position. The remarkable over-expression of ZNFX1 in bivalve and gastropod mollusks infected with dsDNA viruses underscores the antiviral role of ZNFX1, whereas nothing similar was found in virus-infected nematodes and corals. Whether the functional diversification reported in the C. elegans ZNFX1 occurs in other metazoan proteins remains to be established.
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Affiliation(s)
- Giulia Blasi
- Department of Biology, University of Padova, 35121, Padova, Italy
| | | | | | | | - Chang-Ming Bai
- Laboratory for Marine Fisheries Science and Food Production Processes, Pilot National Laboratory for Marine Science and Technology (Qingdao), Yellow Sea Fisheries Research Institute, CAFS, Qingdao, 266237, China
| | - Umberto Rosani
- Department of Biology, University of Padova, 35121, Padova, Italy.
| | - Paola Venier
- Department of Biology, University of Padova, 35121, Padova, Italy.
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7
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Coelho JC, Calhoun ED, Calhoun GN, Poole AZ. Patchy Distribution of GTPases of Immunity Associated Proteins (GIMAP) within Cnidarians and Dinoflagellates Suggests a Complex Evolutionary History. Genome Biol Evol 2022; 14:6500283. [PMID: 35015849 PMCID: PMC8857920 DOI: 10.1093/gbe/evac002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/05/2022] [Indexed: 11/24/2022] Open
Abstract
GTPases of Immunity-Associated Proteins (GIMAP) are a group of small GTP-binding proteins found in a variety of organisms, including vertebrates, invertebrates, and plants. These proteins are characterized by the highly conserved AIG1 domain, and in vertebrates, have been implicated in regulation of the immune system as well as apoptosis and autophagy, though their exact mechanism of action remains unclear. Recent work on cnidarian GIMAPs suggests a conserved role in immunity, apoptosis, and autophagy—three processes involved in coral bleaching, or the breakdown of cnidarian-dinoflagellate symbiosis. Therefore, to further understand the evolution of GIMAPs in this group of organisms, the purpose of this study was to characterize GIMAP or GIMAP-like sequences utilizing publicly available genomic and transcriptomic data in species across the cnidarian phylogeny. The results revealed a patchy distribution of GIMAPs in cnidarians, with three distinct types referred to as L-GIMAP, S-GIMAP, and GIMAP-like. Additionally, GIMAPs were present in most dinoflagellate species and formed seven well-supported clades. Overall, these results elucidate the distribution of GIMAPs within two distantly related eukaryotic groups and represent the first in-depth investigation on the evolution of these proteins within both protists and basal metazoans.
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Affiliation(s)
- Jenny C Coelho
- Department of Biology, Berry College, 2277 Martha Berry Highway NW, Mt. Berry GA, 30149, USA.,Department of Biology, University of North Carolina at Chapel Hill, 120 South Rd, Chapel Hill, NC 27599, USA
| | - Ethan D Calhoun
- Department of Biology, Berry College, 2277 Martha Berry Highway NW, Mt. Berry GA, 30149, USA
| | - Grant N Calhoun
- Department of Biology, Berry College, 2277 Martha Berry Highway NW, Mt. Berry GA, 30149, USA
| | - Angela Z Poole
- Department of Biology, Berry College, 2277 Martha Berry Highway NW, Mt. Berry GA, 30149, USA
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8
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Takahashi-Kariyazono S, Terai Y. Two divergent haplogroups of a sacsin-like gene in Acropora corals. Sci Rep 2021; 11:23018. [PMID: 34837037 PMCID: PMC8626496 DOI: 10.1038/s41598-021-02386-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 11/08/2021] [Indexed: 11/24/2022] Open
Abstract
Reef-building corals are declining due to environmental changes. Sacsin is a member of the heat shock proteins and has been reported as a candidate protein associated with the stress response in Acropora corals. Recently, high nucleotide diversity and the persistence of two divergent haplogroups of sacsin-like genes in Acropora millepora have been reported. While it was not clear when the two haplogroups have split and whether the haplogroups have persisted in only A. millepora or the other lineages in the genus Acropora. In this study, we analyzed a genomic region containing a sacsin-like gene from Acropora and Montipora species. Higher nucleotide diversity in the sacsin-like gene compared with that of surrounding regions was also observed in A. digitifera. This nucleotide diversity is derived from two divergent haplogroups of a sacsin-like gene, which are present in at least three Acropora species. The origin of these two haplogroups can be traced back before the divergence of Acropora and Montipora (119 Ma). Although the link between exceptionally high genetic variation in sacsin-like genes and functional differences in sacsin-like proteins is not clear, the divergent haplogroups may respond differently to envionmental stressors and serve in the adaptive phsiological ecology of these keystone species.
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Affiliation(s)
- Shiho Takahashi-Kariyazono
- Department of Evolutionary Studies of Biosystems, SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama, 240-0193, Japan.
| | - Yohey Terai
- Department of Evolutionary Studies of Biosystems, SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama, 240-0193, Japan.
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9
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Limoges MA, Cloutier M, Nandi M, Ilangumaran S, Ramanathan S. The GIMAP Family Proteins: An Incomplete Puzzle. Front Immunol 2021; 12:679739. [PMID: 34135906 PMCID: PMC8201404 DOI: 10.3389/fimmu.2021.679739] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 05/12/2021] [Indexed: 12/19/2022] Open
Abstract
Overview: Long-term survival of T lymphocytes in quiescent state is essential to maintain their cell numbers in secondary lymphoid organs and in peripheral circulation. In the BioBreeding diabetes-prone strain of rats (BB-DP), loss of functional GIMAP5 (GTPase of the immune associated nucleotide binding protein 5) results in profound peripheral T lymphopenia. This discovery heralded the identification of a new family of proteins initially called Immune-associated nucleotide binding protein (IAN) family. In this review we will use ‘GIMAP’ to refer to this family of proteins. Recent studies suggest that GIMAP proteins may interact with each other and also be involved in the movement of the cellular cargo along the cytoskeletal network. Here we will summarize the current knowledge on the characteristics and functions of GIMAP family of proteins.
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Affiliation(s)
- Marc-André Limoges
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke and CRCHUS, Sherbrooke, QC, Canada
| | - Maryse Cloutier
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke and CRCHUS, Sherbrooke, QC, Canada
| | - Madhuparna Nandi
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke and CRCHUS, Sherbrooke, QC, Canada
| | - Subburaj Ilangumaran
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke and CRCHUS, Sherbrooke, QC, Canada
| | - Sheela Ramanathan
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke and CRCHUS, Sherbrooke, QC, Canada
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10
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Tracy AM, Weil E, Burge CA. Ecological Factors Mediate Immunity and Parasitic Co-Infection in Sea Fan Octocorals. Front Immunol 2021; 11:608066. [PMID: 33505396 PMCID: PMC7829190 DOI: 10.3389/fimmu.2020.608066] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 11/24/2020] [Indexed: 11/13/2022] Open
Abstract
The interplay among environment, demography, and host-parasite interactions is a challenging frontier. In the ocean, fundamental changes are occurring due to anthropogenic pressures, including increased disease outbreaks on coral reefs. These outbreaks include multiple parasites, calling into question how host immunity functions in this complex milieu. Our work investigates the interplay of factors influencing co-infection in the Caribbean sea fan octocoral, Gorgonia ventalina, using metrics of the innate immune response: cellular immunity and expression of candidate immune genes. We used existing copepod infections and live pathogen inoculation with the Aspergillus sydowii fungus, detecting increased expression of the immune recognition gene Tachylectin 5A (T5A) in response to both parasites. Cellular immunity increased by 8.16% in copepod infections compared to controls and single Aspergillus infections. We also detected activation of cellular immunity in reef populations, with a 13.6% increase during copepod infections. Cellular immunity was similar in the field and in the lab, increasing with copepod infections and not the fungus. Amoebocyte density and the expression of T5A and a matrix metalloproteinase (MMP) gene were also positively correlated across all treatments and colonies, irrespective of parasitic infection. We then assessed the scaling of immune metrics to population-level disease patterns and found random co-occurrence of copepods and fungus across 15 reefs in Puerto Rico. The results suggest immune activation by parasites may not alter parasite co-occurrence if factors other than immunity prevail in structuring parasite infection. We assessed non-immune factors in the field and found that sea fan colony size predicted infection by the copepod parasite. Moreover, the effect of infection on immunity was small relative to that of site differences and live coral cover, and similar to the effect of reproductive status. While additional immune data would shed light on the extent of this pattern, ecological factors may play a larger role than immunity in controlling parasite patterns in the wild. Parsing the effects of immunity and ecological factors in octocoral co-infection shows how disease depends on more than one host and one parasite and explores the application of co-infection research to a colonial marine organism.
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Affiliation(s)
- Allison M. Tracy
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, United States
| | - Ernesto Weil
- Department of Marine Sciences, University of Puerto Rico, Mayagüez, PR, United States
| | - Colleen A. Burge
- Institute of Marine and Environmental Technology, University of Maryland Baltimore County, Baltimore, MD, United States
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11
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Bailey GF, Coelho JC, Poole AZ. Differential expression of Exaiptasia pallida GIMAP genes upon induction of apoptosis and autophagy suggests a potential role in cnidarian symbiosis and disease. J Exp Biol 2020; 223:jeb229906. [PMID: 32978315 DOI: 10.1242/jeb.229906] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 09/15/2020] [Indexed: 01/11/2023]
Abstract
Coral reefs, one of the world's most productive and diverse ecosystems, are currently threatened by a variety of stressors that result in increased prevalence of both bleaching and disease. Therefore, understanding the molecular mechanisms involved in these responses is critical to mitigate future damage to the reefs. One group of genes that is potentially involved in cnidarian immunity and symbiosis is GTPases of immunity associated proteins (GIMAP). In vertebrates, this family of proteins is involved in regulating the fate of developing lymphocytes and interacts with proteins involved in apoptosis and autophagy. As apoptosis, autophagy and immunity have previously been shown to be involved in cnidarian symbiosis and disease, the goal of this research was to determine the role of cnidarian GIMAPs in these processes using the anemone Exaiptasia pallida To do so, GIMAP genes were characterized in the E. pallida genome and changes in gene expression were measured using qPCR in response to chemical induction of apoptosis, autophagy and treatment with the immune stimulant lipopolysaccharide (LPS) in both aposymbiotic and symbiotic anemones. The results revealed four GIMAP-like genes in E. pallida, referred to as Ep_GIMAPs Induction of apoptosis and autophagy resulted in a general downregulation of Ep_GIMAPs, but no significant changes were observed in response to LPS treatment. This indicates that Ep_GIMAPs may be involved in the regulation of apoptosis and autophagy, and therefore could play a role in cnidarian-dinoflagellate symbiosis. Overall, these results increase our knowledge on the function of GIMAPs in a basal metazoan.
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Affiliation(s)
- Grace F Bailey
- Department of Biology, Berry College, 2277 Martha Berry Highway NW, Mt. Berry, GA 30161, USA
| | - Jenny C Coelho
- Department of Biology, Berry College, 2277 Martha Berry Highway NW, Mt. Berry, GA 30161, USA
| | - Angela Z Poole
- Department of Biology, Berry College, 2277 Martha Berry Highway NW, Mt. Berry, GA 30161, USA
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12
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Parisi MG, Parrinello D, Stabili L, Cammarata M. Cnidarian Immunity and the Repertoire of Defense Mechanisms in Anthozoans. BIOLOGY 2020; 9:E283. [PMID: 32932829 PMCID: PMC7563517 DOI: 10.3390/biology9090283] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 09/04/2020] [Accepted: 09/04/2020] [Indexed: 02/07/2023]
Abstract
Anthozoa is the most specious class of the phylum Cnidaria that is phylogenetically basal within the Metazoa. It is an interesting group for studying the evolution of mutualisms and immunity, for despite their morphological simplicity, Anthozoans are unexpectedly immunologically complex, with large genomes and gene families similar to those of the Bilateria. Evidence indicates that the Anthozoan innate immune system is not only involved in the disruption of harmful microorganisms, but is also crucial in structuring tissue-associated microbial communities that are essential components of the cnidarian holobiont and useful to the animal's health for several functions including metabolism, immune defense, development, and behavior. Here, we report on the current state of the art of Anthozoan immunity. Like other invertebrates, Anthozoans possess immune mechanisms based on self/non-self-recognition. Although lacking adaptive immunity, they use a diverse repertoire of immune receptor signaling pathways (PRRs) to recognize a broad array of conserved microorganism-associated molecular patterns (MAMP). The intracellular signaling cascades lead to gene transcription up to endpoints of release of molecules that kill the pathogens, defend the self by maintaining homeostasis, and modulate the wound repair process. The cells play a fundamental role in immunity, as they display phagocytic activities and secrete mucus, which acts as a physicochemical barrier preventing or slowing down the proliferation of potential invaders. Finally, we describe the current state of knowledge of some immune effectors in Anthozoan species, including the potential role of toxins and the inflammatory response in the Mediterranean Anthozoan Anemonia viridis following injection of various foreign particles differing in type and dimensions, including pathogenetic bacteria.
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Affiliation(s)
- Maria Giovanna Parisi
- Department of Earth and Marine Sciences, University of Palermo, 90128 Palermo, Italy;
| | - Daniela Parrinello
- Department of Earth and Marine Sciences, University of Palermo, 90128 Palermo, Italy;
| | - Loredana Stabili
- Department of Biological and Environmental Sciences and Technologies, University of Salento, 73100 Lecce, Italy;
| | - Matteo Cammarata
- Department of Earth and Marine Sciences, University of Palermo, 90128 Palermo, Italy;
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13
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Lu L, Loker ES, Zhang SM, Buddenborg SK, Bu L. Genome-wide discovery, and computational and transcriptional characterization of an AIG gene family in the freshwater snail Biomphalaria glabrata, a vector for Schistosoma mansoni. BMC Genomics 2020; 21:190. [PMID: 32122294 PMCID: PMC7053062 DOI: 10.1186/s12864-020-6534-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Accepted: 01/23/2020] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND The AIG (avrRpt2-induced gene) family of GTPases, characterized by the presence of a distinctive AIG1 domain, is mysterious in having a peculiar phylogenetic distribution, a predilection for undergoing expansion and loss, and an uncertain functional role, especially in invertebrates. AIGs are frequently represented as GIMAPs (GTPase of the immunity associated protein family), characterized by presence of the AIG1 domain along with coiled-coil domains. Here we provide an overview of the remarkably expanded AIG repertoire of the freshwater gastropod Biomphalaria glabrata, compare it with AIGs in other organisms, and detail patterns of expression in B. glabrata susceptible or resistant to infection with Schistosoma mansoni, responsible for the neglected tropical disease of intestinal schistosomiasis. RESULTS We define the 7 conserved motifs that comprise the AIG1 domain in B. glabrata and detail its association with at least 7 other domains, indicative of functional versatility of B. glabrata AIGs. AIG genes were usually found in tandem arrays in the B. glabrata genome, suggestive of an origin by segmental gene duplication. We found 91 genes with complete AIG1 domains, including 64 GIMAPs and 27 AIG genes without coiled-coils, more than known for any other organism except Danio (with > 100). We defined expression patterns of AIG genes in 12 different B. glabrata organs and characterized whole-body AIG responses to microbial PAMPs, and of schistosome-resistant or -susceptible strains of B. glabrata to S. mansoni exposure. Biomphalaria glabrata AIG genes clustered with expansions of AIG genes from other heterobranch gastropods yet showed unique lineage-specific subclusters. Other gastropods and bivalves had separate but also diverse expansions of AIG genes, whereas cephalopods seem to lack AIG genes. CONCLUSIONS The AIG genes of B. glabrata exhibit expansion in both numbers and potential functions, differ markedly in expression between strains varying in susceptibility to schistosomes, and are responsive to immune challenge. These features provide strong impetus to further explore the functional role of AIG genes in the defense responses of B. glabrata, including to suppress or support the development of medically relevant S. mansoni parasites.
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Affiliation(s)
- Lijun Lu
- Center for Evolutionary and Theoretical Immunology, Department of Biology, University of New Mexico, Albuquerque, NM 87131 USA
| | - Eric S. Loker
- Center for Evolutionary and Theoretical Immunology, Department of Biology, University of New Mexico, Albuquerque, NM 87131 USA
| | - Si-Ming Zhang
- Center for Evolutionary and Theoretical Immunology, Department of Biology, University of New Mexico, Albuquerque, NM 87131 USA
| | - Sarah K. Buddenborg
- Wellcome Sanger Institute, Wellcome Trust Genome Campus, Hinxton, CB10 1SA UK
| | - Lijing Bu
- Center for Evolutionary and Theoretical Immunology, Department of Biology, University of New Mexico, Albuquerque, NM 87131 USA
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14
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Roesel CL, Vollmer SV. Differential gene expression analysis of symbiotic and aposymbiotic Exaiptasia anemones under immune challenge with Vibrio coralliilyticus. Ecol Evol 2019; 9:8279-8293. [PMID: 31380089 PMCID: PMC6662555 DOI: 10.1002/ece3.5403] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 05/28/2019] [Accepted: 06/07/2019] [Indexed: 12/24/2022] Open
Abstract
Anthozoans are a class of Cnidarians that includes scleractinian corals, anemones, and their relatives. Despite a global rise in disease epizootics impacting scleractinian corals, little is known about the immune response of this key group of invertebrates. To better characterize the anthozoan immune response, we used the model anemone Exaiptasia pallida to explore the genetic links between the anthozoan-algal symbioses and immunity in a two-factor RNA-Seq experiment using both symbiotic and aposymbiotic (menthol-bleached) Exaiptasia pallida exposed to the bacterial pathogen Vibrio coralliilyticus. Multivariate and univariate analyses of Exaiptasia gene expression demonstrated that exposure to live Vibrio coralliilyticus had strong and significant impacts on transcriptome-wide gene expression for both symbiotic and aposymbiotic anemones, but we did not observe strong interactions between symbiotic state and Vibrio exposure. There were 4,164 significantly differentially expressed (DE) genes for Vibrio exposure, 1,114 DE genes for aposymbiosis, and 472 DE genes for the additive combinations of Vibrio and aposymbiosis. KEGG enrichment analyses identified 11 pathways-involved in immunity (5), transport and catabolism (4), and cell growth and death (2)-that were enriched due to both Vibrio and/or aposymbiosis. Immune pathways showing strongest differential expression included complement, coagulation, nucleotide-binding, and oligomerization domain (NOD), and Toll for Vibrio exposure and coagulation and apoptosis for aposymbiosis.
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15
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Wang Y, Li Y, Rosas-Diaz T, Caceres-Moreno C, Lozano-Duran R, Macho AP. The IMMUNE-ASSOCIATED NUCLEOTIDE-BINDING 9 Protein Is a Regulator of Basal Immunity in Arabidopsis thaliana. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2019; 32:65-75. [PMID: 29958083 DOI: 10.1094/mpmi-03-18-0062-r] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A robust regulation of plant immune responses requires a multitude of positive and negative regulators that act in concert. The immune-associated nucleotide-binding (IAN) gene family members are associated with immunity in different organisms, although no characterization of their function has been carried out to date in plants. In this work, we analyzed the expression patterns of IAN genes and found that IAN9 is repressed upon pathogen infection or treatment with immune elicitors. IAN9 encodes a plasma membrane-localized protein that genetically behaves as a negative regulator of immunity. A novel ian9 mutant generated by CRISPR/Cas9 shows increased resistance to Pseudomonas syringae, while transgenic plants overexpressing IAN9 show a slight increase in susceptibility. In vivo immunoprecipitation of IAN9-green fluorescent protein followed by mass spectrometry analysis revealed that IAN9 associates with a previously uncharacterized C3HC4-type RING-finger domain-containing protein that we named IAN9-associated protein 1 (IAP1), which also acts as a negative regulator of basal immunity. Interestingly, neither ian9 or iap1 mutant plants show any obvious developmental phenotype, suggesting that they display enhanced inducible immunity rather than constitutive immune responses. Because both IAN9 and IAP1 have orthologs in important crop species, they could be suitable targets to generate plants more resistant to diseases caused by bacterial pathogens without yield penalty.
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Affiliation(s)
- Yuanzheng Wang
- 1 Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences; Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai 201602, China; and
- 2 University of Chinese Academy of Sciences, Beijing, China
| | - Yansha Li
- 1 Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences; Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai 201602, China; and
| | - Tabata Rosas-Diaz
- 1 Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences; Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai 201602, China; and
| | - Carlos Caceres-Moreno
- 1 Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences; Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai 201602, China; and
- 2 University of Chinese Academy of Sciences, Beijing, China
| | - Rosa Lozano-Duran
- 1 Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences; Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai 201602, China; and
| | - Alberto P Macho
- 1 Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences; Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai 201602, China; and
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16
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A continuous genome assembly of the corkwing wrasse (Symphodus melops). Genomics 2018; 110:399-403. [DOI: 10.1016/j.ygeno.2018.04.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 04/06/2018] [Accepted: 04/10/2018] [Indexed: 12/20/2022]
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17
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Pita L, Hoeppner MP, Ribes M, Hentschel U. Differential expression of immune receptors in two marine sponges upon exposure to microbial-associated molecular patterns. Sci Rep 2018; 8:16081. [PMID: 30382170 PMCID: PMC6208332 DOI: 10.1038/s41598-018-34330-w] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Accepted: 10/12/2018] [Indexed: 02/07/2023] Open
Abstract
The innate immune system helps animals to navigate the microbial world. The response to microbes relies on the specific recognition of microbial-associated molecular patterns (MAMPs) by immune receptors. Sponges (phylum Porifera), as early-diverging animals, provide insights into conserved mechanisms for animal-microbe crosstalk. However, experimental data is limited. We adopted an experimental approach followed by RNA-Seq and differential gene expression analysis in order to characterise the sponge immune response. Two Mediterranean species, Aplysina aerophoba and Dysidea avara, were exposed to a “cocktail” of MAMPs (lipopolysaccharide and peptidoglycan) or to sterile artificial seawater (control) and sampled 1 h, 3 h, and 5 h post-treatment for RNA-Seq. The response involved, first and foremost, a higher number of differentially-expressed genes in A. aerophoba than D. avara. Secondly, while both species constitutively express a diverse repertoire of immune receptors, they differed in their expression profiles upon MAMP challenge. The response in D. avara was mediated by increased expression of two NLR genes, whereas the response in A. aerophoba involved SRCR and GPCR genes. From the set of annotated genes we infer that both species activated apoptosis in response to MAMPs while in A. aerophoba phagocytosis was additionally stimulated. Our study assessed for the first time the transcriptomic responses of sponges to MAMPs and revealed conserved and species-specific features of poriferan immunity as well as genes potentially relevant to animal-microbe interactions.
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Affiliation(s)
- Lucía Pita
- RD3 Marine Microbiology, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany.
| | - Marc P Hoeppner
- Institute of Clinical Molecular Biology, Christian-Albrechts University of Kiel, Kiel, Germany
| | - Marta Ribes
- Institute of Marine Science, CSIC, Barcelona, Spain
| | - Ute Hentschel
- RD3 Marine Microbiology, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany.,Christian-Albrechts-University of Kiel (CAU), Kiel, Germany
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18
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Cunning R, Bay RA, Gillette P, Baker AC, Traylor-Knowles N. Comparative analysis of the Pocillopora damicornis genome highlights role of immune system in coral evolution. Sci Rep 2018; 8:16134. [PMID: 30382153 PMCID: PMC6208414 DOI: 10.1038/s41598-018-34459-8] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 10/19/2018] [Indexed: 12/22/2022] Open
Abstract
Comparative analysis of the expanding genomic resources for scleractinian corals may provide insights into the evolution of these organisms, with implications for their continued persistence under global climate change. Here, we sequenced and annotated the genome of Pocillopora damicornis, one of the most abundant and widespread corals in the world. We compared this genome, based on protein-coding gene orthology, with other publicly available coral genomes (Cnidaria, Anthozoa, Scleractinia), as well as genomes from other anthozoan groups (Actiniaria, Corallimorpharia), and two basal metazoan outgroup phlya (Porifera, Ctenophora). We found that 46.6% of P. damicornis genes had orthologs in all other scleractinians, defining a coral ‘core’ genome enriched in basic housekeeping functions. Of these core genes, 3.7% were unique to scleractinians and were enriched in immune functionality, suggesting an important role of the immune system in coral evolution. Genes occurring only in P. damicornis were enriched in cellular signaling and stress response pathways, and we found similar immune-related gene family expansions in each coral species, indicating that immune system diversification may be a prominent feature of scleractinian coral evolution at multiple taxonomic levels. Diversification of the immune gene repertoire may underlie scleractinian adaptations to symbiosis, pathogen interactions, and environmental stress.
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Affiliation(s)
- R Cunning
- Department of Marine Biology and Ecology, University of Miami Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, Miami, FL, 33149, USA. .,Daniel P. Haerther Center for Conservation and Research, John G. Shedd Aquarium, 1200 South Lake Shore Drive, Chicago, IL, 60605, USA.
| | - R A Bay
- Department of Evolution and Ecology, University of California Davis, One Shields Ave, Davis, CA, 95616, USA
| | - P Gillette
- Department of Marine Biology and Ecology, University of Miami Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, Miami, FL, 33149, USA
| | - A C Baker
- Department of Marine Biology and Ecology, University of Miami Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, Miami, FL, 33149, USA
| | - N Traylor-Knowles
- Department of Marine Biology and Ecology, University of Miami Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, Miami, FL, 33149, USA.
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19
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Pascall JC, Webb LMC, Eskelinen EL, Innocentin S, Attaf-Bouabdallah N, Butcher GW. GIMAP6 is required for T cell maintenance and efficient autophagy in mice. PLoS One 2018; 13:e0196504. [PMID: 29718959 PMCID: PMC5931655 DOI: 10.1371/journal.pone.0196504] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Accepted: 04/13/2018] [Indexed: 11/19/2022] Open
Abstract
The GTPases of the immunity-associated proteins (GIMAP) GTPases are a family of proteins expressed strongly in the adaptive immune system. We have previously reported that in human cells one member of this family, GIMAP6, interacts with the ATG8 family member GABARAPL2, and is recruited to autophagosomes upon starvation, suggesting a role for GIMAP6 in the autophagic process. To study this possibility and the function of GIMAP6 in the immune system, we have established a mouse line in which the Gimap6 gene can be inactivated by Cre-mediated recombination. In mice bred to carry the CD2Cre transgene such that the Gimap6 gene was deleted within the T and B cell lineages there was a 50–70% reduction in peripheral CD4+ and CD8+ T cells. Analysis of splenocyte-derived proteins from these mice indicated increased levels of MAP1LC3B, particularly the lipidated LC3-II form, and S405-phosphorylation of SQSTM1. Electron microscopic measurements of Gimap6-/- CD4+ T cells indicated an increased mitochondrial/cytoplasmic volume ratio and increased numbers of autophagosomes. These results are consistent with autophagic disruption in the cells. However, Gimap6-/- T cells were largely normal in character, could be effectively activated in vitro and supported T cell-dependent antibody production. Treatment in vitro of CD4+ splenocytes from GIMAP6fl/flERT2Cre mice with 4-hydroxytamoxifen resulted in the disappearance of GIMAP6 within five days. In parallel, increased phosphorylation of SQSTM1 and TBK1 was observed. These results indicate a requirement for GIMAP6 in the maintenance of a normal peripheral adaptive immune system and a significant role for the protein in normal autophagic processes. Moreover, as GIMAP6 is expressed in a cell-selective manner, this indicates the potential existence of a cell-restricted mode of autophagic regulation.
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Affiliation(s)
- John C. Pascall
- Laboratory of Lymphocyte Signalling and Development, Babraham Institute, Babraham Research Campus, Cambridge, United Kingdom
| | - Louise M. C. Webb
- Laboratory of Lymphocyte Signalling and Development, Babraham Institute, Babraham Research Campus, Cambridge, United Kingdom
| | - Eeva-Liisa Eskelinen
- Department of Biosciences, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Silvia Innocentin
- Laboratory of Lymphocyte Signalling and Development, Babraham Institute, Babraham Research Campus, Cambridge, United Kingdom
| | - Noudjoud Attaf-Bouabdallah
- Laboratory of Lymphocyte Signalling and Development, Babraham Institute, Babraham Research Campus, Cambridge, United Kingdom
| | - Geoffrey W. Butcher
- Laboratory of Lymphocyte Signalling and Development, Babraham Institute, Babraham Research Campus, Cambridge, United Kingdom
- * E-mail:
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20
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Fuess LE, Pinzón C JH, Weil E, Grinshpon RD, Mydlarz LD. Life or death: disease-tolerant coral species activate autophagy following immune challenge. Proc Biol Sci 2018; 284:rspb.2017.0771. [PMID: 28592676 DOI: 10.1098/rspb.2017.0771] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 05/11/2017] [Indexed: 12/25/2022] Open
Abstract
Global climate change has increased the number and severity of stressors affecting species, yet not all species respond equally to these stressors. Organisms may employ cellular mechanisms such as apoptosis and autophagy in responding to stressful events. These two pathways are often mutually exclusive, dictating whether a cell adapts or dies. In order to examine differences in cellular response to stress, we compared the immune response of four coral species with a range of disease susceptibility. Using RNA-seq and novel pathway analysis, we were able to identify differences in response to immune stimulation between these species. Disease-susceptible species Orbicella faveolata activated pathways associated with apoptosis. By contrast, disease-tolerant species Porites porites and Porites astreoides activated autophagic pathways. Moderately susceptible species Pseudodiploria strigosa activated a mixture of these pathways. These findings were corroborated by apoptotic caspase protein assays, which indicated increased caspase activity following immune stimulation in susceptible species. Our results indicate that in response to immune stress, disease-tolerant species activate cellular adaptive mechanisms such as autophagy, while susceptible species turn on cell death pathways. Differences in these cellular maintenance pathways may therefore influence the organismal stress response. Further study of these pathways will increase understanding of differential stress response and species survival in the face of changing environments.
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Affiliation(s)
- Lauren E Fuess
- Department of Biology, University of Texas Arlington, Arlington, TX, USA
| | - Jorge H Pinzón C
- Department of Biology, University of Texas Arlington, Arlington, TX, USA
| | - Ernesto Weil
- Department of Marine Sciences, University of Puerto Rico, Mayagüez, PR, USA
| | - Robert D Grinshpon
- Department of Biology, University of Texas Arlington, Arlington, TX, USA
| | - Laura D Mydlarz
- Department of Biology, University of Texas Arlington, Arlington, TX, USA
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21
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Deciphering the nature of the coral-Chromera association. ISME JOURNAL 2018; 12:776-790. [PMID: 29321691 PMCID: PMC5864212 DOI: 10.1038/s41396-017-0005-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 08/22/2017] [Accepted: 10/10/2017] [Indexed: 12/25/2022]
Abstract
Since the discovery of Chromera velia as a novel coral-associated microalga, this organism has attracted interest because of its unique evolutionary position between the photosynthetic dinoflagellates and the parasitic apicomplexans. The nature of the relationship between Chromera and its coral host is controversial. Is it a mutualism, from which both participants benefit, a parasitic relationship, or a chance association? To better understand the interaction, larvae of the common Indo-Pacific reef-building coral Acropora digitifera were experimentally infected with Chromera, and the impact on the host transcriptome was assessed at 4, 12, and 48 h post-infection using Illumina RNA-Seq technology. The transcriptomic response of the coral to Chromera was complex and implies that host immunity is strongly suppressed, and both phagosome maturation and the apoptotic machinery is modified. These responses differ markedly from those described for infection with a competent strain of the coral mutualist Symbiodinium, instead resembling those of vertebrate hosts to parasites and/or pathogens such as Mycobacterium tuberculosis. Consistent with ecological studies suggesting that the association may be accidental, the transcriptional response of A. digitifera larvae leads us to conclude that Chromera could be a coral parasite, commensal, or accidental bystander, but certainly not a beneficial mutualist.
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22
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Ho CH, Tsai SF. Functional and biochemical characterization of a T cell-associated anti-apoptotic protein, GIMAP6. J Biol Chem 2017; 292:9305-9319. [PMID: 28381553 DOI: 10.1074/jbc.m116.768689] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Revised: 03/31/2017] [Indexed: 11/06/2022] Open
Abstract
GTPases of immunity-associated proteins (GIMAPs) are expressed in lymphocytes and regulate survival/death signaling and cell development within the immune system. We found that human GIMAP6 is expressed primarily in T cell lines. By sorting human peripheral blood mononuclear cells and performing quantitative RT-PCR, GIMAP6 was found to be expressed in CD3+ cells. In Jurkat cells that had been knocked down for GIMAP6, treatment with hydrogen peroxide, FasL, or okadaic acid significantly increased cell death/apoptosis. Exogenous expression of GMAP6 protected Huh-7 cells from apoptosis, suggesting that GIMAP6 is an anti-apoptotic protein. Furthermore, knockdown of GIMAP6 not only rendered Jurkat cells sensitive to apoptosis but also accelerated T cell activation under phorbol 12-myristate 13-acetate/ionomycin treatment conditions. Using this experimental system, we also observed a down-regulation of p65 phosphorylation (Ser-536) in GIMAP6 knockdown cells, indicating that GIMAP6 might display anti-apoptotic function through NF-κB activation. The conclusion from the study on cultured T cells was corroborated by the analysis of primary CD3+ T cells, showing that specific knockdown of GIMAP6 led to enhancement of phorbol 12-myristate 13-acetate/ionomycin-mediated activation signals. To characterize the biochemical properties of GIMAP6, we purified the recombinant GIMAP6 to homogeneity and revealed that GIMAP6 had ATPase as well as GTPase activity. We further demonstrated that the hydrolysis activity of GIMAP6 was not essential for its anti-apoptotic function in Huh-7 cells. Combining the expression data, biochemical properties, and cellular features, we conclude that GIMAP6 plays a role in modulating immune function and that it does this by controlling cell death and the activation of T cells.
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Affiliation(s)
- Ching-Huang Ho
- From the Department of Life Sciences and Institute of Genome Sciences, National Yang-Ming University, Taipei 112, Taiwan and
| | - Shih-Feng Tsai
- From the Department of Life Sciences and Institute of Genome Sciences, National Yang-Ming University, Taipei 112, Taiwan and .,the Institute of Molecular and Genomic Medicine, National Health Research Institutes, Zhunan, Miaoli 350, Taiwan
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Fuess LE, Pinzόn C JH, Weil E, Mydlarz LD. Associations between transcriptional changes and protein phenotypes provide insights into immune regulation in corals. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2016; 62:17-28. [PMID: 27109903 DOI: 10.1016/j.dci.2016.04.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 04/18/2016] [Accepted: 04/19/2016] [Indexed: 06/05/2023]
Abstract
Disease outbreaks in marine ecosystems have driven worldwide declines of numerous taxa, including corals. Some corals, such as Orbicella faveolata, are particularly susceptible to disease. To explore the mechanisms contributing to susceptibility, colonies of O. faveolata were exposed to immune challenge with lipopolysaccharides. RNA sequencing and protein activity assays were used to characterize the response of corals to immune challenge. Differential expression analyses identified 17 immune-related transcripts that varied in expression post-immune challenge. Network analyses revealed several groups of transcripts correlated to immune protein activity. Several transcripts, which were annotated as positive regulators of immunity were included in these groups, and some were downregulated following immune challenge. Correlations between expression of these transcripts and protein activity results further supported the role of these transcripts in positive regulation of immunity. The observed pattern of gene expression and protein activity may elucidate the processes contributing to the disease susceptibility of species like O. faveolata.
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Affiliation(s)
- Lauren E Fuess
- Department of Biology, University of Texas Arlington, Arlington, TX, USA
| | - Jorge H Pinzόn C
- Department of Biology, University of Texas Arlington, Arlington, TX, USA
| | - Ernesto Weil
- Department of Marine Sciences, University of Puerto Rico, Mayagüez, PR, USA
| | - Laura D Mydlarz
- Department of Biology, University of Texas Arlington, Arlington, TX, USA.
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McDowell IC, Modak TH, Lane CE, Gomez-Chiarri M. Multi-species protein similarity clustering reveals novel expanded immune gene families in the eastern oyster Crassostrea virginica. FISH & SHELLFISH IMMUNOLOGY 2016; 53:13-23. [PMID: 27033806 DOI: 10.1016/j.fsi.2016.03.157] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 03/24/2016] [Accepted: 03/24/2016] [Indexed: 06/05/2023]
Abstract
Comparative genomics research in non-model species has highlighted how invertebrate hosts possess complex diversified repertoires of immune molecules. The levels of diversification in particular immune gene families appear to differ between invertebrate lineages and even between species within lineages, reflecting differences not only in evolutionary histories, but also in life histories, environmental niches, and pathogen exposures. The goal of this research was to identify immune-related gene families experiencing high levels of diversification in eastern oysters, Crassostrea virginica. Families containing 1) transcripts differentially expressed in eastern oysters in response to bacterial challenge and 2) a larger number of transcripts compared to other species included those coding for the C1q and C-type lectin domain containing proteins (C1qDC and CTLDC), GTPase of the immune-associated proteins (GIMAP), scavenger receptors (SR), fibrinogen-C domain containing proteins (also known as FREPs), dopamine beta-hydrolase (DBH), interferon-inducible 44 (IFI44), serine protease inhibitors, apextrin, and dermatopontin. Phylogenetic analysis of two of the families significantly expanded in bivalves, IFI44 and GIMAP, showed a patchy distribution within both protostomes and deuterostomes, suggesting multiple independent losses and lineage-specific expansions. Increased availability of genomic information for a broader range of non-model species broadly distributed through vertebrate and invertebrate phyla will likely lead to improved knowledge on mechanisms of immune-gene diversification.
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25
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Zhang SM, Loker ES, Sullivan JT. Pathogen-associated molecular patterns activate expression of genes involved in cell proliferation, immunity and detoxification in the amebocyte-producing organ of the snail Biomphalaria glabrata. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2016; 56:25-36. [PMID: 26592964 PMCID: PMC5335875 DOI: 10.1016/j.dci.2015.11.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 11/16/2015] [Accepted: 11/17/2015] [Indexed: 05/30/2023]
Abstract
The anterior pericardial wall of the snail Biomphalaria glabrata has been identified as a site of hemocyte production, hence has been named the amebocyte-producing organ (APO). A number of studies have shown that exogenous abiotic and biotic substances, including pathogen associated molecular patterns (PAMPs), are able to stimulate APO mitotic activity and/or enlarge its size, implying a role for the APO in innate immunity. The molecular mechanisms underlying such responses have not yet been explored, in part due to the difficulty in obtaining sufficient APO tissue for gene expression studies. By using a modified RNA extraction technique and microarray technology, we investigated transcriptomic responses of APOs dissected from snails at 24 h post-injection with two bacterial PAMPs, lipopolysaccharide (LPS) and peptidoglycan (PGN), or with fucoidan (FCN), which may mimic fucosyl-rich glycan PAMPs on sporocysts of Schistosoma mansoni. Based upon the number of genes differentially expressed, LPS exhibited the strongest activity, relative to saline-injected controls. A concurrent activation of genes involved in cell proliferation, immune response and detoxification metabolism was observed. A gene encoding checkpoint 1 kinase, a key regulator of mitosis, was highly expressed after stimulation by LPS. Also, seven different aminoacyl-tRNA synthetases that play an essential role in protein synthesis were found to be highly expressed. In addition to stimulating genes involved in cell proliferation, the injected substances, especially LPS, also induced expression of a number of immune-related genes including arginase, peptidoglycan recognition protein short form, tumor necrosis factor receptor, ficolin, calmodulin, bacterial permeability increasing proteins and E3 ubiquitin-protein ligase. Importantly, significant up-regulation was observed in four GiMAP (GTPase of immunity-associated protein) genes, a result which provides the first evidence suggesting an immune role of GiMAP in protostome animals. Moreover, altered expression of genes encoding cytochrome P450, glutathione-S-transferase, multiple drug resistance protein as well as a large number of genes encoding enzymes associated with degradation and detoxification metabolism was elicited in response to the injected substances.
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Affiliation(s)
- Si-Ming Zhang
- Center for Evolutionarily and Theoretical Immunology, Department of Biology, The University of New Mexico, Albuquerque, NM 87131, USA.
| | - Eric S Loker
- Center for Evolutionarily and Theoretical Immunology, Department of Biology, The University of New Mexico, Albuquerque, NM 87131, USA; Parasite Division, Museum of Southwestern Biology, The University of New Mexico, Albuquerque, NM 87131, USA
| | - John T Sullivan
- Department of Biology, University of San Francisco, San Francisco, CA 94117, USA
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Anderson DA, Walz ME, Weil E, Tonellato P, Smith MC. RNA-Seq of the Caribbean reef-building coral Orbicella faveolata (Scleractinia-Merulinidae) under bleaching and disease stress expands models of coral innate immunity. PeerJ 2016; 4:e1616. [PMID: 26925311 PMCID: PMC4768675 DOI: 10.7717/peerj.1616] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 01/01/2016] [Indexed: 12/16/2022] Open
Abstract
Climate change-driven coral disease outbreaks have led to widespread declines in coral populations. Early work on coral genomics established that corals have a complex innate immune system, and whole-transcriptome gene expression studies have revealed mechanisms by which the coral immune system responds to stress and disease. The present investigation expands bioinformatic data available to study coral molecular physiology through the assembly and annotation of a reference transcriptome of the Caribbean reef-building coral, Orbicella faveolata. Samples were collected during a warm water thermal anomaly, coral bleaching event and Caribbean yellow band disease outbreak in 2010 in Puerto Rico. Multiplex sequencing of RNA on the Illumina GAIIx platform and de novo transcriptome assembly by Trinity produced 70,745,177 raw short-sequence reads and 32,463 O. faveolata transcripts, respectively. The reference transcriptome was annotated with gene ontologies, mapped to KEGG pathways, and a predicted proteome of 20,488 sequences was generated. Protein families and signaling pathways that are essential in the regulation of innate immunity across Phyla were investigated in-depth. Results were used to develop models of evolutionarily conserved Wnt, Notch, Rig-like receptor, Nod-like receptor, and Dicer signaling. O. faveolata is a coral species that has been studied widely under climate-driven stress and disease, and the present investigation provides new data on the genes that putatively regulate its immune system.
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Affiliation(s)
- David A Anderson
- Department of Pathology and Immunology, Washington University in St. Louis, St. Louis, Missouri, United States of America; Department of Marine Sciences, University of Puerto Rico at Mayagüez, Mayagüez, Puerto Rico, United States of America
| | - Marcus E Walz
- Joseph J. Zilber School of Public Health, University of Wisconsin-Milwaukee , Milwaukee, Wisconsin , United States of America
| | - Ernesto Weil
- Department of Marine Sciences, University of Puerto Rico at Mayagüez , Mayagüez, Puerto Rico , United States of America
| | - Peter Tonellato
- Joseph J. Zilber School of Public Health, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, United States of America; Department of Biomedical Informatics, Harvard Medical School, Harvard University, Boston, Massachusetts, United States of America
| | - Matthew C Smith
- School of Freshwater Sciences, University of Wisconsin-Milwaukee , Milwaukee, Wisconsin , United States of America
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Gochfeld DJ, Ankisetty S, Slattery M. Proteomic profiling of healthy and diseased hybrid soft corals Sinularia maxima × S. polydactyla. DISEASES OF AQUATIC ORGANISMS 2015; 116:133-141. [PMID: 26480916 DOI: 10.3354/dao02910] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Emerging diseases of marine invertebrates have been implicated as one of the major causes of the continuing decline in coral reefs worldwide. To date, most of the focus on marine diseases has been aimed at hard (scleractinian) corals, which are the main reef builders worldwide. However, soft (alcyonacean) corals are also essential components of tropical reefs, representing food, habitat and the 'glue' that consolidates reefs, and they are subject to the same stressors as hard corals. Sinularia maxima and S. polydactyla are the dominant soft corals on the shallow reefs of Guam, where they hybridize. In addition to both parent species, the hybrid soft coral population in Guam is particularly affected by Sinularia tissue loss disease. Using label-free shotgun proteomics, we identified differences in protein expression between healthy and diseased colonies of the hybrid S. maxima × S. polydactyla. This study provided qualitative and quantitative data on specific proteins that were differentially expressed under the stress of disease. In particular, metabolic proteins were down-regulated, whereas proteins related to stress and to symbiont photosynthesis were up-regulated in the diseased soft corals. These results indicate that soft corals are responding to pathogenesis at the level of the proteome, and that this label-free approach can be used to identify and quantify protein biomarkers of sub-lethal stress in studies of marine disease.
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Affiliation(s)
- Deborah J Gochfeld
- National Center for Natural Products Research, and Department of BioMolecular Sciences, University of Mississippi, PO Box 1848, University, MS 38677-1848, USA
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Ocampo ID, Zárate-Potes A, Pizarro V, Rojas CA, Vera NE, Cadavid LF. The immunotranscriptome of the Caribbean reef-building coral Pseudodiploria strigosa. Immunogenetics 2015; 67:515-30. [PMID: 26123975 DOI: 10.1007/s00251-015-0854-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 06/17/2015] [Indexed: 12/21/2022]
Abstract
The viability of coral reefs worldwide has been seriously compromised in the last few decades due in part to the emergence of coral diseases of infectious nature. Despite important efforts to understand the etiology and the contribution of environmental factors associated to coral diseases, the mechanisms of immune response in corals are just beginning to be studied systematically. In this study, we analyzed the set of conserved immune response genes of the Caribbean reef-building coral Pseudodiploria strigosa by Illumina-based transcriptome sequencing and annotation of healthy colonies challenged with whole live Gram-positive and Gram-negative bacteria. Searching the annotated transcriptome with immune-related terms yielded a total of 2782 transcripts predicted to encode conserved immune-related proteins that were classified into three modules: (a) the immune recognition module, containing a wide diversity of putative pattern recognition receptors including leucine-rich repeat-containing proteins, immunoglobulin superfamily receptors, representatives of various lectin families, and scavenger receptors; (b) the intracellular signaling module, containing components from the Toll-like receptor, transforming growth factor, MAPK, and apoptosis signaling pathways; and (3) the effector module, including the C3 and factor B complement components, a variety of proteases and protease inhibitors, and the melanization-inducing phenoloxidase. P. strigosa displays a highly variable and diverse immune recognition repertoire that has likely contributed to its resilience to coral diseases.
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Affiliation(s)
- Iván D Ocampo
- Departamento de Biología, Universidad Nacional de Colombia, Cr 30 No. 45-08, Bogotá, Colombia
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29
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Wright RM, Aglyamova GV, Meyer E, Matz MV. Gene expression associated with white syndromes in a reef building coral, Acropora hyacinthus. BMC Genomics 2015; 16:371. [PMID: 25956907 PMCID: PMC4425862 DOI: 10.1186/s12864-015-1540-2] [Citation(s) in RCA: 129] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 04/17/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Corals are capable of launching diverse immune defenses at the site of direct contact with pathogens, but the molecular mechanisms of this activity and the colony-wide effects of such stressors remain poorly understood. Here we compared gene expression profiles in eight healthy Acropora hyacinthus colonies against eight colonies exhibiting tissue loss commonly associated with white syndromes, all collected from a natural reef environment near Palau. Two types of tissues were sampled from diseased corals: visibly affected and apparently healthy. RESULTS Tag-based RNA-Seq followed by weighted gene co-expression network analysis identified groups of co-regulated differentially expressed genes between all health states (disease lesion, apparently healthy tissues of diseased colonies, and fully healthy). Differences between healthy and diseased tissues indicate activation of several innate immunity and tissue repair pathways accompanied by reduced calcification and the switch towards metabolic reliance on stored lipids. Unaffected parts of diseased colonies, although displaying a trend towards these changes, were not significantly different from fully healthy samples. Still, network analysis identified a group of genes, suggestive of altered immunity state, that were specifically up-regulated in unaffected parts of diseased colonies. CONCLUSIONS Similarity of fully healthy samples to apparently healthy parts of diseased colonies indicates that systemic effects of white syndromes on A. hyacinthus are weak, which implies that the coral colony is largely able to sustain its physiological performance despite disease. The genes specifically up-regulated in unaffected parts of diseased colonies, instead of being the consequence of disease, might be related to the originally higher susceptibility of these colonies to naturally occurring white syndromes.
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Affiliation(s)
- Rachel M Wright
- Institute for Cell and Molecular Biology, The University of Texas at Austin, Austin, USA.
| | - Galina V Aglyamova
- Department of Integrative Biology, The University of Texas at Austin, Austin, USA.
| | - Eli Meyer
- Department of Zoology, Oregon State University, Corvallis, USA.
| | - Mikhail V Matz
- Department of Integrative Biology, The University of Texas at Austin, Austin, USA.
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30
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Seneca FO, Palumbi SR. The role of transcriptome resilience in resistance of corals to bleaching. Mol Ecol 2015; 24:1467-84. [DOI: 10.1111/mec.13125] [Citation(s) in RCA: 113] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Revised: 02/16/2015] [Accepted: 02/18/2015] [Indexed: 12/14/2022]
Affiliation(s)
- Francois O. Seneca
- Department of Biology; Stanford University; Hopkins Marine Station Pacific Grove CA 93950 USA
| | - Stephen R. Palumbi
- Department of Biology; Stanford University; Hopkins Marine Station Pacific Grove CA 93950 USA
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Tubulin- and actin-associating GIMAP4 is required for IFN-γ secretion during Th cell differentiation. Immunol Cell Biol 2014; 93:158-66. [PMID: 25287446 PMCID: PMC4355353 DOI: 10.1038/icb.2014.86] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 09/05/2014] [Accepted: 09/06/2014] [Indexed: 12/20/2022]
Abstract
Although GTPase of the immunity-associated protein (GIMAP) family are known to be most highly expressed in the cells of the immune system, their function and role remain still poorly characterized. Small GTPases in general are known to be involved in many cellular processes in a cell type-specific manner and to contribute to specific differentiation processes. Among GIMAP family, GIMAP4 is the only member reported to have true GTPase activity, and its transcription is found to be differentially regulated during early human CD4(+) T helper (Th) lymphocyte differentiation. GIMAP4 has been previously connected mainly with T- and B-cell development and survival and T-cell apoptosis. Here we show GIMAP4 to be localized into cytoskeletal elements and with the component of the trans golgi network, which suggests it to have a function in cellular transport processes. We demonstrate that depletion of GIMAP4 with RNAi results in downregulation of endoplasmic reticulum localizing chaperone VMA21. Most importantly, we discovered that GIMAP4 regulates secretion of cytokines in early differentiating human CD4(+) Th lymphocytes and in particular the secretion of interferon-γ also affecting its downstream targets.
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Vidal-Dupiol J, Dheilly NM, Rondon R, Grunau C, Cosseau C, Smith KM, Freitag M, Adjeroud M, Mitta G. Thermal stress triggers broad Pocillopora damicornis transcriptomic remodeling, while Vibrio coralliilyticus infection induces a more targeted immuno-suppression response. PLoS One 2014; 9:e107672. [PMID: 25259845 PMCID: PMC4178034 DOI: 10.1371/journal.pone.0107672] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 08/13/2014] [Indexed: 12/19/2022] Open
Abstract
Global change and its associated temperature increase has directly or indirectly changed the distributions of hosts and pathogens, and has affected host immunity, pathogen virulence and growth rates. This has resulted in increased disease in natural plant and animal populations worldwide, including scleractinian corals. While the effects of temperature increase on immunity and pathogen virulence have been clearly identified, their interaction, synergy and relative weight during pathogenesis remain poorly documented. We investigated these phenomena in the interaction between the coral Pocillopora damicornis and the bacterium Vibrio coralliilyticus, for which the infection process is temperature-dependent. We developed an experimental model that enabled unraveling the effects of thermal stress, and virulence vs. non-virulence of the bacterium. The physiological impacts of various treatments were quantified at the transcriptome level using a combination of RNA sequencing and targeted approaches. The results showed that thermal stress triggered a general weakening of the coral, making it more prone to infection, non-virulent bacterium induced an ‘efficient’ immune response, whereas virulent bacterium caused immuno-suppression in its host.
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Affiliation(s)
- Jeremie Vidal-Dupiol
- CNRS, Ecologie et Evolution des Interactions, UMR 5244, Perpignan, France
- Univ. Perpignan Via Domitia, Ecologie et Evolution des Interactions, UMR 5244, Perpignan, France
- * E-mail:
| | - Nolwenn M. Dheilly
- CNRS, Ecologie et Evolution des Interactions, UMR 5244, Perpignan, France
- Univ. Perpignan Via Domitia, Ecologie et Evolution des Interactions, UMR 5244, Perpignan, France
| | - Rodolfo Rondon
- CNRS, Ecologie et Evolution des Interactions, UMR 5244, Perpignan, France
- Univ. Perpignan Via Domitia, Ecologie et Evolution des Interactions, UMR 5244, Perpignan, France
- Reponse Immunitaire des Macroorganismes et Environnement, Ecologie des Systèmes Marins côtiers, UMR 5119 CNRS-Ifremer-UM2, Montpellier, France
| | - Christoph Grunau
- CNRS, Ecologie et Evolution des Interactions, UMR 5244, Perpignan, France
- Univ. Perpignan Via Domitia, Ecologie et Evolution des Interactions, UMR 5244, Perpignan, France
| | - Céline Cosseau
- CNRS, Ecologie et Evolution des Interactions, UMR 5244, Perpignan, France
- Univ. Perpignan Via Domitia, Ecologie et Evolution des Interactions, UMR 5244, Perpignan, France
| | - Kristina M. Smith
- Department of Biochemistry and Biophysics, Center for Genome Research and Biocomputing, Oregon State University, Corvallis, Oregon, United States of America
| | - Michael Freitag
- Department of Biochemistry and Biophysics, Center for Genome Research and Biocomputing, Oregon State University, Corvallis, Oregon, United States of America
| | - Mehdi Adjeroud
- Institut de Recherche pour le Développement, Unité 227 CoRéUs2 “Biocomplexité des écosystèmes coralliens de l’Indo-Pacifique”, Laboratoire d’excellence CORAIL, Banyuls-sur-Mer, France
| | - Guillaume Mitta
- CNRS, Ecologie et Evolution des Interactions, UMR 5244, Perpignan, France
- Univ. Perpignan Via Domitia, Ecologie et Evolution des Interactions, UMR 5244, Perpignan, France
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Libro S, Kaluziak ST, Vollmer SV. RNA-seq profiles of immune related genes in the staghorn coral Acropora cervicornis infected with white band disease. PLoS One 2013; 8:e81821. [PMID: 24278460 PMCID: PMC3836749 DOI: 10.1371/journal.pone.0081821] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Accepted: 10/24/2013] [Indexed: 01/20/2023] Open
Abstract
Coral diseases are among the most serious threats to coral reefs worldwide, yet most coral diseases remain poorly understood. How the coral host responds to pathogen infection is an area where very little is known. Here we used next-generation RNA-sequencing (RNA-seq) to produce a transcriptome-wide profile of the immune response of the Staghorn coral Acropora cervicornis to White Band Disease (WBD) by comparing infected versus healthy (asymptomatic) coral tissues. The transcriptome of A. cervicornis was assembled de novo from A-tail selected Illumina mRNA-seq data from whole coral tissues, and parsed bioinformatically into coral and non-coral transcripts using existing Acropora genomes in order to identify putative coral transcripts. Differentially expressed transcripts were identified in the coral and non-coral datasets to identify genes that were up- and down-regulated due to disease infection. RNA-seq analyses indicate that infected corals exhibited significant changes in gene expression across 4% (1,805 out of 47,748 transcripts) of the coral transcriptome. The primary response to infection included transcripts involved in macrophage-mediated pathogen recognition and ROS production, two hallmarks of phagocytosis, as well as key mediators of apoptosis and calcium homeostasis. The strong up-regulation of the enzyme allene oxide synthase-lipoxygenase suggests a key role of the allene oxide pathway in coral immunity. Interestingly, none of the three primary innate immune pathways - Toll-like receptors (TLR), Complement, and prophenoloxydase pathways, were strongly associated with the response of A. cervicornis to infection. Five-hundred and fifty differentially expressed non-coral transcripts were classified as metazoan (n = 84), algal or plant (n = 52), fungi (n = 24) and protozoans (n = 13). None of the 52 putative Symbiodinium or algal transcript had any clear immune functions indicating that the immune response is driven by the coral host, and not its algal symbionts.
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Affiliation(s)
- Silvia Libro
- Marine Science Center, Northeastern University, Nahant, Massachusetts, United States of America
- * E-mail:
| | - Stefan T. Kaluziak
- Marine Science Center, Northeastern University, Nahant, Massachusetts, United States of America
| | - Steven V. Vollmer
- Marine Science Center, Northeastern University, Nahant, Massachusetts, United States of America
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