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Jiang L, Zhang P, Huang LT, Yu XL, Liu CY, Yuan XC, Liu S, Huang H. Life-stage specificity and temporal variations in transcriptomes and DNA methylomes of the reef coral Pocillopora damicornis in response to thermal acclimation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 921:171098. [PMID: 38387572 DOI: 10.1016/j.scitotenv.2024.171098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 02/03/2024] [Accepted: 02/17/2024] [Indexed: 02/24/2024]
Abstract
Understanding the acclimation capacity of reef corals across generations to thermal stress and its underlying molecular underpinnings could provide insights into their resilience and adaptive responses to future climate change. Here, we acclimated adult brooding coral Pocillopora damicornis to high temperature (32 °C vs. 29 °C) for three weeks and analyzed the changes in phenotypes, transcriptomes and DNA methylomes of adult corals and their brooded larvae. Results showed that although adult corals did not show noticeable bleaching after thermal exposure, they released fewer but larger larvae. Interestingly, larval cohorts from two consecutive lunar days exhibited contrasting physiological resistance to thermal stress, as evidenced by the divergent responses of area-normalized symbiont densities and photochemical efficiency to thermal stress. RNA-seq and whole-genome bisulfite sequencing revealed that adult and larval corals mounted distinct transcriptional and DNA methylation changes in response to thermal stress. Remarkably, larval transcriptomes and DNA methylomes also varied greatly among lunar days and thermal treatments, aligning well with their physiological metrics. Overall, our study shows that changes in transcriptomes and DNA methylomes in response to thermal acclimation can be highly life stage-specific. More importantly, thermally-acclimated adult corals could produce larval offspring with temporally contrasting photochemical performance and thermal resilience, and such variations in larval phenotypes are associated with differential transcriptomes and DNA methylomes, and are likely to increase the likelihood of reproductive success and plasticity of larval propagules under thermal stress.
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Affiliation(s)
- Lei Jiang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology (SCSIO), Chinese Academy of Sciences, Guangzhou 510301, China; CAS-HKUST Sanya Joint Laboratory of Marine Science Research, Key Laboratory of Tropical Marine Biotechnology of Hainan Province, Sanya Institute of Ocean Eco-Environmental Engineering, SCSIO, Sanya 572000, China; Sanya National Marine Ecosystem Research Station, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China
| | - Pan Zhang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology (SCSIO), Chinese Academy of Sciences, Guangzhou 510301, China; CAS-HKUST Sanya Joint Laboratory of Marine Science Research, Key Laboratory of Tropical Marine Biotechnology of Hainan Province, Sanya Institute of Ocean Eco-Environmental Engineering, SCSIO, Sanya 572000, China; Sanya National Marine Ecosystem Research Station, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lin-Tao Huang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology (SCSIO), Chinese Academy of Sciences, Guangzhou 510301, China; CAS-HKUST Sanya Joint Laboratory of Marine Science Research, Key Laboratory of Tropical Marine Biotechnology of Hainan Province, Sanya Institute of Ocean Eco-Environmental Engineering, SCSIO, Sanya 572000, China; Sanya National Marine Ecosystem Research Station, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiao-Lei Yu
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology (SCSIO), Chinese Academy of Sciences, Guangzhou 510301, China; CAS-HKUST Sanya Joint Laboratory of Marine Science Research, Key Laboratory of Tropical Marine Biotechnology of Hainan Province, Sanya Institute of Ocean Eco-Environmental Engineering, SCSIO, Sanya 572000, China; Sanya National Marine Ecosystem Research Station, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China
| | - Cheng-Yue Liu
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology (SCSIO), Chinese Academy of Sciences, Guangzhou 510301, China; CAS-HKUST Sanya Joint Laboratory of Marine Science Research, Key Laboratory of Tropical Marine Biotechnology of Hainan Province, Sanya Institute of Ocean Eco-Environmental Engineering, SCSIO, Sanya 572000, China; Sanya National Marine Ecosystem Research Station, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China
| | - Xiang-Cheng Yuan
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology (SCSIO), Chinese Academy of Sciences, Guangzhou 510301, China; CAS-HKUST Sanya Joint Laboratory of Marine Science Research, Key Laboratory of Tropical Marine Biotechnology of Hainan Province, Sanya Institute of Ocean Eco-Environmental Engineering, SCSIO, Sanya 572000, China; Sanya National Marine Ecosystem Research Station, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China
| | - Sheng Liu
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology (SCSIO), Chinese Academy of Sciences, Guangzhou 510301, China; CAS-HKUST Sanya Joint Laboratory of Marine Science Research, Key Laboratory of Tropical Marine Biotechnology of Hainan Province, Sanya Institute of Ocean Eco-Environmental Engineering, SCSIO, Sanya 572000, China; Sanya National Marine Ecosystem Research Station, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China
| | - Hui Huang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology (SCSIO), Chinese Academy of Sciences, Guangzhou 510301, China; CAS-HKUST Sanya Joint Laboratory of Marine Science Research, Key Laboratory of Tropical Marine Biotechnology of Hainan Province, Sanya Institute of Ocean Eco-Environmental Engineering, SCSIO, Sanya 572000, China; Sanya National Marine Ecosystem Research Station, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China.
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2
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Williams A. Multiomics data integration, limitations, and prospects to reveal the metabolic activity of the coral holobiont. FEMS Microbiol Ecol 2024; 100:fiae058. [PMID: 38653719 PMCID: PMC11067971 DOI: 10.1093/femsec/fiae058] [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: 09/26/2023] [Revised: 03/25/2024] [Accepted: 04/22/2024] [Indexed: 04/25/2024] Open
Abstract
Since their radiation in the Middle Triassic period ∼240 million years ago, stony corals have survived past climate fluctuations and five mass extinctions. Their long-term survival underscores the inherent resilience of corals, particularly when considering the nutrient-poor marine environments in which they have thrived. However, coral bleaching has emerged as a global threat to coral survival, requiring rapid advancements in coral research to understand holobiont stress responses and allow for interventions before extensive bleaching occurs. This review encompasses the potential, as well as the limits, of multiomics data applications when applied to the coral holobiont. Synopses for how different omics tools have been applied to date and their current restrictions are discussed, in addition to ways these restrictions may be overcome, such as recruiting new technology to studies, utilizing novel bioinformatics approaches, and generally integrating omics data. Lastly, this review presents considerations for the design of holobiont multiomics studies to support lab-to-field advancements of coral stress marker monitoring systems. Although much of the bleaching mechanism has eluded investigation to date, multiomic studies have already produced key findings regarding the holobiont's stress response, and have the potential to advance the field further.
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Affiliation(s)
- Amanda Williams
- Microbial Biology Graduate Program, Rutgers University, 76 Lipman Drive, New Brunswick, NJ 08901, United States
- Department of Biochemistry and Microbiology, Rutgers University, 76 Lipman Drive, New Brunswick, NJ 08901, United States
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3
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Dilworth J, Million WC, Ruggeri M, Hall ER, Dungan AM, Muller EM, Kenkel CD. Synergistic response to climate stressors in coral is associated with genotypic variation in baseline expression. Proc Biol Sci 2024; 291:20232447. [PMID: 38531406 DOI: 10.1098/rspb.2023.2447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 02/16/2024] [Indexed: 03/28/2024] Open
Abstract
As environments are rapidly reshaped due to climate change, phenotypic plasticity plays an important role in the ability of organisms to persist and is considered an especially important acclimatization mechanism for long-lived sessile organisms such as reef-building corals. Often, this ability of a single genotype to display multiple phenotypes depending on the environment is modulated by changes in gene expression, which can vary in response to environmental changes via two mechanisms: baseline expression and expression plasticity. We used transcriptome-wide expression profiling of eleven genotypes of common-gardened Acropora cervicornis to explore genotypic variation in the expression response to thermal and acidification stress, both individually and in combination. We show that the combination of these two stressors elicits a synergistic gene expression response, and that both baseline expression and expression plasticity in response to stress show genotypic variation. Additionally, we demonstrate that frontloading of a large module of coexpressed genes is associated with greater retention of algal symbionts under combined stress. These results illustrate that variation in the gene expression response of individuals to climate change stressors can persist even when individuals have shared environmental histories, affecting their performance under future climate change scenarios.
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Affiliation(s)
| | | | - Maria Ruggeri
- University of Southern California, Los Angeles, CA, USA
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Collins M, Clark MS, Truebano M. The environmental cellular stress response: the intertidal as a multistressor model. Cell Stress Chaperones 2023; 28:467-475. [PMID: 37129699 PMCID: PMC10469114 DOI: 10.1007/s12192-023-01348-7] [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: 04/05/2023] [Revised: 04/05/2023] [Accepted: 04/12/2023] [Indexed: 05/03/2023] Open
Abstract
The wild poses a multifaceted challenge to the maintenance of cellular function. Therefore, a multistressor approach is essential to predict the cellular mechanisms which promote homeostasis and underpin whole-organism tolerance. The intertidal zone is particularly dynamic, and thus, its inhabitants provide excellent models to assess mechanisms underpinning multistressor tolerance. Here, we critically review our current understanding of the regulation of the cellular stress response (CSR) under multiple abiotic stressors in intertidal organisms and consider to what extent a multistressor approach brings us closer to understanding responses in the wild. The function of the CSR has been well documented in laboratory and field exposures with a view to understanding single-stressor thermal effects. Multistressor studies still remain relatively limited in comparison but have applied three main approaches: (i) laboratory application of multiple stressors in isolation, (ii) multiple stressors applied in combination, and (iii) field-based correlation of multiple stressors against the CSR. The application of multiple stressors in isolation has allowed the identification of putative, shared stress pathways but overlooks non-additive stressor interactions on the CSR. Combined stressor studies are relatively limited in number but already highlight variable effects on the CSR dependent upon stressor type, timing, and magnitude. Field studies have allowed the identification of responsive components of the CSR to various stressors in situ but are correlative, not causative. A combined approach involving laboratory multistressor studies linking the CSR to whole-organism tolerance as well as field studies is required if we are to understand the role of the CSR in the natural environment.
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Affiliation(s)
- Michael Collins
- Marine Biology and Ecology Research Centre, School of Biological and Marine Sciences, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK.
| | - Melody S Clark
- British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB3 OET, UK
| | - Manuela Truebano
- Marine Biology and Ecology Research Centre, School of Biological and Marine Sciences, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK
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5
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Kitchen SA, Jiang D, Harii S, Satoh N, Weis VM, Shinzato C. Coral larvae suppress heat stress response during the onset of symbiosis decreasing their odds of survival. Mol Ecol 2022; 31:5813-5830. [PMID: 36168983 DOI: 10.1111/mec.16708] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 09/06/2022] [Accepted: 09/15/2022] [Indexed: 01/13/2023]
Abstract
The endosymbiosis between most corals and their photosynthetic dinoflagellate partners begins early in the host life history, when corals are larvae or juvenile polyps. The capacity of coral larvae to buffer climate-induced stress while in the process of symbiont acquisition could come with physiological trade-offs that alter behaviour, development, settlement and survivorship. Here we examined the joint effects of thermal stress and symbiosis onset on colonization dynamics, survival, metamorphosis and host gene expression of Acropora digitifera larvae. We found that thermal stress decreased symbiont colonization of hosts by 50% and symbiont density by 98.5% over 2 weeks. Temperature and colonization also influenced larval survival and metamorphosis in an additive manner, where colonized larvae fared worse or prematurely metamorphosed more often than noncolonized larvae under thermal stress. Transcriptomic responses to colonization and thermal stress treatments were largely independent, while the interaction of these treatments revealed contrasting expression profiles of genes that function in the stress response, immunity, inflammation and cell cycle regulation. The combined treatment either cancelled or lowered the magnitude of expression of heat-stress responsive genes in the presence of symbionts, revealing a physiological cost to acquiring symbionts at the larval stage with elevated temperatures. In addition, host immune suppression, a hallmark of symbiosis onset under ambient temperature, turned to immune activation under heat stress. Thus, by integrating the physical environment and biotic pressures that mediate presettlement event in corals, our results suggest that colonization may hinder larval survival and recruitment under projected climate scenarios.
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Affiliation(s)
- Sheila A Kitchen
- Department of Integrative Biology, Oregon State University, Corvallis, Oregon, USA
| | - Duo Jiang
- Statistics Department, Oregon State University, Corvallis, Oregon, USA
| | - Saki Harii
- Tropical Biosphere Research Center, University of the Ryukyus, Okinawa, Japan
| | - Noriyuki Satoh
- Marine Genomics Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
| | - Virginia M Weis
- Department of Integrative Biology, Oregon State University, Corvallis, Oregon, USA
| | - Chuya Shinzato
- Marine Genomics Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
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6
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Walker NS, Cornwell BH, Nestor V, Armstrong KC, Golbuu Y, Palumbi SR. Persistence of phenotypic responses to short-term heat stress in the tabletop coral Acropora hyacinthus. PLoS One 2022; 17:e0269206. [PMID: 36084033 PMCID: PMC9462741 DOI: 10.1371/journal.pone.0269206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 08/23/2022] [Indexed: 12/26/2022] Open
Abstract
Widespread mapping of coral thermal resilience is essential for developing effective management strategies and requires replicable and rapid multi-location assays of heat resistance and recovery. One- or two-day short-term heat stress experiments have been previously employed to assess heat resistance, followed by single assays of bleaching condition. We tested the reliability of short-term heat stress resistance, and linked resistance and recovery assays, by monitoring the phenotypic response of fragments from 101 Acropora hyacinthus colonies located in Palau (Micronesia) to short-term heat stress. Following short-term heat stress, bleaching and mortality were recorded after 16 hours, daily for seven days, and after one and two months of recovery. To follow corals over time, we utilized a qualitative, non-destructive visual bleaching score metric that correlated with standard symbiont retention assays. The bleaching state of coral fragments 16 hours post-heat stress was highly indicative of their state over the next 7 days, suggesting that symbiont population sizes within corals may quickly stabilize post-heat stress. Bleaching 16 hours post-heat stress predicted likelihood of mortality over the subsequent 3–5 days, after which there was little additional mortality. Together, bleaching and mortality suggested that rapid assays of the phenotypic response following short-term heat stress were good metrics of the total heat treatment effect. Additionally, our data confirm geographic patterns of intraspecific variation in Palau and show that bleaching severity among colonies was highly correlated with mortality over the first week post-stress. We found high survival (98%) and visible recovery (100%) two months after heat stress among coral fragments that survived the first week post-stress. These findings help simplify rapid, widespread surveys of heat sensitivity in Acropora hyacinthus by showing that standardized short-term experiments can be confidently assayed after 16 hours, and that bleaching sensitivity may be linked to subsequent survival using experimental assessments.
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Affiliation(s)
- Nia S. Walker
- Department of Biology, Hopkins Marine Station of Stanford University, Pacific Grove, California, United States of America
- * E-mail:
| | - Brendan H. Cornwell
- Department of Biology, Hopkins Marine Station of Stanford University, Pacific Grove, California, United States of America
| | | | - Katrina C. Armstrong
- Department of Biology, Hopkins Marine Station of Stanford University, Pacific Grove, California, United States of America
| | | | - Stephen R. Palumbi
- Department of Biology, Hopkins Marine Station of Stanford University, Pacific Grove, California, United States of America
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7
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Ip JCH, Zhang Y, Xie JY, Yeung YH, Qiu JW. Comparative transcriptomics of two coral holobionts collected during the 2017 El Niño heat wave reveal differential stress response mechanisms. MARINE POLLUTION BULLETIN 2022; 182:114017. [PMID: 35963227 DOI: 10.1016/j.marpolbul.2022.114017] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 07/28/2022] [Accepted: 07/31/2022] [Indexed: 06/15/2023]
Abstract
Although coral species exhibit differential susceptibility to stressors, little is known about the underlying molecular mechanisms. Here we compared scleractinian corals Montipora peltiformis and Platygyra carnosa collected during the 2017 El Niño heat wave. Zooxanthellae density and chlorophyll a content declined and increased substantially during and after heat stress event, respective. However, the magnitude of change was larger in M. peltiformis. Transcriptome analysis showed that heat-stressed corals corresponded to metabolic depression and catabolism of amino acids in both hosts which might promote their survival. However, only M. peltiformis has developed the bleached coral phenotype with corresponding strong stress- and immune-related responses in the host and symbiont, and strong suppression of photosynthesis-related genes in the symbiont. Overall, our study reveals differences among species in the homeostatic capacity to prevent the development of the bleached phenotype under environmental stressors, eventually determining their likelihood of survival in the warming ocean.
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Affiliation(s)
- Jack Chi-Ho Ip
- Department of Biology, Hong Kong Baptist University, Hong Kong, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; HKBU Institute of Research and Continuing Education, Virtual University Park, Shenzhen, China
| | - Yanjie Zhang
- School of Life Sciences, Hainan University, Haikou, China.
| | - James Y Xie
- Department of Biology, Hong Kong Baptist University, Hong Kong, China
| | - Yip Hung Yeung
- Department of Biology, Hong Kong Baptist University, Hong Kong, China
| | - Jian-Wen Qiu
- Department of Biology, Hong Kong Baptist University, Hong Kong, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; HKBU Institute of Research and Continuing Education, Virtual University Park, Shenzhen, China.
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8
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Drury C, Bean NK, Harris CI, Hancock JR, Huckeba J, H CM, Roach TNF, Quinn RA, Gates RD. Intrapopulation adaptive variance supports thermal tolerance in a reef-building coral. Commun Biol 2022; 5:486. [PMID: 35589814 PMCID: PMC9120509 DOI: 10.1038/s42003-022-03428-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 04/28/2022] [Indexed: 01/05/2023] Open
Abstract
Coral holobionts are multi-species assemblages, which adds significant complexity to genotype-phenotype connections underlying ecologically important traits like coral bleaching. Small scale heterogeneity in bleaching is ubiquitous in the absence of strong environmental gradients, which provides adaptive variance needed for the long-term persistence of coral reefs. We used RAD-seq, qPCR and LC-MS/MS metabolomics to characterize host genomic variation, symbiont community and biochemical correlates in two bleaching phenotypes of the vertically transmitting coral Montipora capitata. Phenotype was driven by symbiosis state and host genetic variance. We documented 5 gene ontologies that were significantly associated with both the binary bleaching phenotype and symbiont composition, representing functions that confer a phenotype via host-symbiont interactions. We bred these corals and show that symbiont communities were broadly conserved in bulk-crosses, resulting in significantly higher survivorship under temperature stress in juveniles, but not larvae, from tolerant parents. Using a select and re-sequence approach, we document numerous gene ontologies selected by heat stress, some of which (cell signaling, antioxidant activity, pH regulation) have unique selection dynamics in larvae from thermally tolerant parents. These data show that vertically transmitting corals may have an adaptive advantage under climate change if host and symbiont variance interact to influence bleaching phenotype.
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Affiliation(s)
- Crawford Drury
- Hawai'i Institute of Marine Biology, University of Hawai'i, Kāne'ohe, HI, USA.
| | - Nina K Bean
- Hawai'i Institute of Marine Biology, University of Hawai'i, Kāne'ohe, HI, USA
| | - Casey I Harris
- Hawai'i Institute of Marine Biology, University of Hawai'i, Kāne'ohe, HI, USA
| | - Joshua R Hancock
- Hawai'i Institute of Marine Biology, University of Hawai'i, Kāne'ohe, HI, USA
| | - Joel Huckeba
- Hawai'i Institute of Marine Biology, University of Hawai'i, Kāne'ohe, HI, USA
- University of Amsterdam, Amsterdam, Netherlands
| | - Christian Martin H
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, USA
| | - Ty N F Roach
- Hawai'i Institute of Marine Biology, University of Hawai'i, Kāne'ohe, HI, USA
| | - Robert A Quinn
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, USA
| | - Ruth D Gates
- Hawai'i Institute of Marine Biology, University of Hawai'i, Kāne'ohe, HI, USA
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9
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Yuyama I, Higuchi T, Mezaki T, Tashiro H, Ikeo K. Metatranscriptomic Analysis of Corals Inoculated With Tolerant and Non-Tolerant Symbiont Exposed to High Temperature and Light Stress. Front Physiol 2022; 13:806171. [PMID: 35480050 PMCID: PMC9037784 DOI: 10.3389/fphys.2022.806171] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Accepted: 02/17/2022] [Indexed: 11/13/2022] Open
Abstract
Algal symbionts of corals can influence host stress resistance; for example, in the Pacific Ocean, whereas Cladocopium (C-type) is generally dominant in corals, Durusdinium (D-type) is found in more heat-resistant corals. Thus, the presence of D-type symbiont likely increases coral heat tolerance, and this symbiotic relationship potentially provides a hint to increase the stress tolerance of coral–algal symbioses. In this study, transcriptome profiles of Cladocopium- and Durusdinium-harboring Acropora solitaryensis (C-coral and D-coral, respectively) and algal photosystem functioning (Fv/Fm) under bleaching conditions (high temperature and light stress) were compared. Stress treatment caused algal photoinhibition that the Fv/Fm value of Symbiodiniaceae was immediately reduced. The transcriptome analysis of corals revealed that genes involved in the following processes were detected: endoplasmic reticulum (ER) stress, mitophagy, apoptosis, endocytosis, metabolic processes (acetyl-CoA, chitin metabolic processes, etc.), and the PI3K-AKT pathway were upregulated, while DNA replication and the calcium signaling pathway were downregulated in both C- and D-corals. These results suggest that unrepaired DNA and protein damages were accumulated in corals under high temperature and light stress. Additionally, some differentially expressed genes (DEGs) were specific to C- or D-corals, which includes genes involved in transient receptor potential (TRP) channels and vitamin B metabolic processes. Algal transcriptome analysis showed the increased expression of gene encoding photosystem and molecular chaperone especially in D-type symbiont. The transcriptome data imply a possible difference in the stress reactions on C-type and D-type symbionts. The results reveal the basic process of coral heat/light stress response and symbiont-type-specific coral transcriptional responses, which provides a perspective on the mechanisms that cause differences in coral stress tolerance.
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Affiliation(s)
- Ikuko Yuyama
- Graduate School of Science and Technology for Innovation, Yamaguchi University, Yamaguchi, Japan
- *Correspondence: Ikuko Yuyama
| | - Tomihiko Higuchi
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
| | - Takuma Mezaki
- Kuroshio Biological Research Foundation, Otsuki, Japan
| | - Hisako Tashiro
- Department of Genomics and Evolutionary Biology, National Institute of Genetics, Mishima, Japan
| | - Kazuho Ikeo
- Department of Genomics and Evolutionary Biology, National Institute of Genetics, Mishima, Japan
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10
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Zanetti M, Xian S, Dosset M, Carter H. The Unfolded Protein Response at the Tumor-Immune Interface. Front Immunol 2022; 13:823157. [PMID: 35237269 PMCID: PMC8882736 DOI: 10.3389/fimmu.2022.823157] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 01/26/2022] [Indexed: 12/14/2022] Open
Abstract
The tumor-immune interface has surged to primary relevance in an effort to understand the hurdles facing immune surveillance and cancer immunotherapy. Reports over the past decades have indicated a role for the unfolded protein response (UPR) in modulating not only tumor cell fitness and drug resistance, but also local immunity, with emphasis on the phenotype and altered function of immune cells such as myeloid cells and T cells. Emerging evidence also suggests that aneuploidy correlates with local immune dysregulation. Recently, we reported that the UPR serves as a link between aneuploidy and immune cell dysregulation in a cell nonautonomous way. These new findings add considerable complexity to the organization of the tumor microenvironment (TME) and the origin of its altered function. In this review, we summarize these data and also discuss the role of aneuploidy as a negative regulator of local immunity.
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Affiliation(s)
- Maurizio Zanetti
- The Laboratory of Immunology, Department of Medicine and Moores Cancer Center, University of California San Diego, La Jolla, CA, United States
- *Correspondence: Maurizio Zanetti, ; orcid.org/0000-0001-6346-8776
| | - Su Xian
- Division of Medical Genetics, Department of Medicine, Bioinformatics and System Biology Program, University of California San Diego, La Jolla, CA, United States
| | - Magalie Dosset
- The Laboratory of Immunology, Department of Medicine and Moores Cancer Center, University of California San Diego, La Jolla, CA, United States
| | - Hannah Carter
- Division of Medical Genetics, Department of Medicine, Bioinformatics and System Biology Program, University of California San Diego, La Jolla, CA, United States
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11
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Zhang Y, Ip JCH, Xie JY, Yeung YH, Sun Y, Qiu JW. Host-symbiont transcriptomic changes during natural bleaching and recovery in the leaf coral Pavona decussata. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150656. [PMID: 34597574 DOI: 10.1016/j.scitotenv.2021.150656] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 09/24/2021] [Accepted: 09/24/2021] [Indexed: 06/13/2023]
Abstract
Coral bleaching has become a major threat to coral reefs worldwide, but for most coral species little is known about their resilience to environmental changes. We aimed to understand the gene expressional regulation underlying natural bleaching and recovery in Pavona decussata, a dominant species of scleractinian coral in the northern South China Sea. Analyzing samples collected in 2017 from the field revealed distinct zooxanthellae density, chlorophyll a concentration and transcriptomic signatures corresponding to changes in health conditions of the coral holobiont. In the host, normal-looking tissues of partially bleached colonies were frontloaded with stress responsive genes, as indicated by upregulation of immune defense, response to endoplasmic reticulum, and oxidative stress genes. Bleaching was characterized by upregulation of apoptosis-related genes which could cause a reduction in algal symbionts, and downregulation of genes involved in stress responses and metabolic processes. The transcription factors stat5b and irf1 played key roles in bleaching by regulating immune and apoptosis pathways. Recovery from bleaching was characterized by enrichment of pathways involved in mitosis, DNA replication, and recombination for tissue repairing, as well as restoration of energy and metabolism. In the symbionts, bleaching corresponded to imbalance in photosystems I and II activities which enhanced oxidative stress and limited energy production and nutrient assimilation. Overall, our study revealed distinct gene expressional profiles and regulation in the different phases of the bleaching and recovery process, and provided new insight into the molecular mechanisms underlying the holobiont's resilience that may determine the species' fate in response to global and regional environmental changes.
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Affiliation(s)
- Yanjie Zhang
- Department of Biology, Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Hong Kong Baptist University, Hong Kong, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong, China
| | - Jack Chi-Ho Ip
- Department of Biology, Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Hong Kong Baptist University, Hong Kong, China
| | - James Y Xie
- Department of Biology, Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Hong Kong Baptist University, Hong Kong, China
| | - Yip Hung Yeung
- Department of Biology, Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Hong Kong Baptist University, Hong Kong, China
| | - Yanan Sun
- Department of Biology, Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Hong Kong Baptist University, Hong Kong, China
| | - Jian-Wen Qiu
- Department of Biology, Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Hong Kong Baptist University, Hong Kong, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong, China.
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12
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Smith EG, Hazzouri KM, Choi JY, Delaney P, Al-Kharafi M, Howells EJ, Aranda M, Burt JA. Signatures of selection underpinning rapid coral adaptation to the world's warmest reefs. SCIENCE ADVANCES 2022; 8:eabl7287. [PMID: 35020424 PMCID: PMC10954036 DOI: 10.1126/sciadv.abl7287] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 11/19/2021] [Indexed: 06/14/2023]
Abstract
Coral populations in the world’s warmest reefs, the Persian/Arabian Gulf (PAG), represent an ideal model system to understand the evolutionary response of coral populations to past and present environmental change and to identify genomic loci that contribute to elevated thermal tolerance. Here, we use population genomics of the brain coral Platygyra daedalea to show that corals in the PAG represent a distinct subpopulation that was established during the Holocene marine transgression, and identify selective sweeps in their genomes associated with thermal adaptation. We demonstrate the presence of positive and disruptive selection and provide evidence for selection of differentially methylated haplotypes. While demographic analyses suggest limited potential for genetic rescue of neighboring Indian Ocean reefs, the presence of putative targets of selection in corals outside of the PAG offers hope that loci associated with thermal tolerance may be present in the standing genetic variation.
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Affiliation(s)
- Edward G. Smith
- Department of Biological Sciences, The University of North Carolina at Charlotte, Charlotte, NC, USA
- Water Research Center & Center for Genomics and Systems Biology, New York University Abu Dhabi, Abu Dhabi, UAE
| | - Khaled M. Hazzouri
- Water Research Center & Center for Genomics and Systems Biology, New York University Abu Dhabi, Abu Dhabi, UAE
- Khalifa Center for Genetic Engineering and Biotechnology, United Arab Emirates University, Abu Dhabi, UAE
| | - Jae Young Choi
- Center for Genomics and Systems Biology, New York University, New York, NY, USA
| | - Patrice Delaney
- Water Research Center & Center for Genomics and Systems Biology, New York University Abu Dhabi, Abu Dhabi, UAE
| | - Mohammed Al-Kharafi
- Department of Fisheries Resource Development, Public Authority of Agriculture and Fisheries Resources, Kuwait City, Kuwait
| | - Emily J. Howells
- Water Research Center & Center for Genomics and Systems Biology, New York University Abu Dhabi, Abu Dhabi, UAE
- National Marine Science Centre, Faculty of Science and Engineering, Southern Cross University, Coffs Harbour, NSW, Australia
| | - Manuel Aranda
- King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - John A. Burt
- Water Research Center & Center for Genomics and Systems Biology, New York University Abu Dhabi, Abu Dhabi, UAE
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13
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Ziegler M, Anton A, Klein SG, Rädecker N, Geraldi NR, Schmidt-Roach S, Saderne V, Mumby PJ, Cziesielski MJ, Martin C, Frölicher TL, Pandolfi JM, Suggett DJ, Aranda M, Duarte CM, Voolstra CR. Integrating environmental variability to broaden the research on coral responses to future ocean conditions. GLOBAL CHANGE BIOLOGY 2021; 27:5532-5546. [PMID: 34391212 DOI: 10.1111/gcb.15840] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 06/19/2021] [Accepted: 06/25/2021] [Indexed: 06/13/2023]
Abstract
Our understanding of the response of reef-building corals to changes in their physical environment is largely based on laboratory experiments, analysis of long-term field data, and model projections. Experimental data provide unique insights into how organisms respond to variation of environmental drivers. However, an assessment of how well experimental conditions cover the breadth of environmental conditions and variability where corals live successfully is missing. Here, we compiled and analyzed a globally distributed dataset of in-situ seasonal and diurnal variability of key environmental drivers (temperature, pCO2 , and O2 ) critical for the growth and livelihood of reef-building corals. Using a meta-analysis approach, we compared the variability of environmental conditions assayed in coral experimental studies to current and projected conditions in their natural habitats. We found that annual temperature profiles projected for the end of the 21st century were characterized by distributional shifts in temperatures with warmer winters and longer warm periods in the summer, not just peak temperatures. Furthermore, short-term hourly fluctuations of temperature and pCO2 may regularly expose corals to conditions beyond the projected average increases for the end of the 21st century. Coral reef sites varied in the degree of coupling between temperature, pCO2 , and dissolved O2 , which warrants site-specific, differentiated experimental approaches depending on the local hydrography and influence of biological processes on the carbonate system and O2 availability. Our analysis highlights that a large portion of the natural environmental variability at short and long timescales is underexplored in experimental designs, which may provide a path to extend our understanding on the response of corals to global climate change.
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Affiliation(s)
- Maren Ziegler
- Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Giessen, Germany
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Andrea Anton
- Red Sea Research Center (RSRC) and Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
- Global Change Research Group, IMEDEA (CSIC-UIB), Mediterranean Institute for Advanced Studies, Esporles (Illes Balears), Spain
| | - Shannon G Klein
- Red Sea Research Center (RSRC) and Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Nils Rädecker
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
- Department of Biology, University of Konstanz, Konstanz, Germany
- Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Nathan R Geraldi
- Red Sea Research Center (RSRC) and Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Sebastian Schmidt-Roach
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Vincent Saderne
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Peter J Mumby
- Marine Spatial Ecology Lab, School of Biological Sciences, The University of Queensland, St. Lucia, Qld, Australia
| | - Maha J Cziesielski
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Cecilia Martin
- Red Sea Research Center (RSRC) and Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Thomas L Frölicher
- Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland
- Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
| | - John M Pandolfi
- Australian Research Council Centre of Excellence for Coral Reef Studies, School of Biological Sciences, The University of Queensland, Brisbane, Qld, Australia
| | - David J Suggett
- Climate Change Cluster, Faculty of Science, University of Technology Sydney, Sydney, NSW, Australia
| | - Manuel Aranda
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Carlos M Duarte
- Red Sea Research Center (RSRC) and Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Christian R Voolstra
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
- Department of Biology, University of Konstanz, Konstanz, Germany
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14
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Page CE, Leggat W, Heron SF, Fordyce AJ, Ainsworth TD. High flow conditions mediate damaging impacts of sub-lethal thermal stress on corals' endosymbiotic algae. CONSERVATION PHYSIOLOGY 2021; 9:coab046. [PMID: 34188937 PMCID: PMC8226191 DOI: 10.1093/conphys/coab046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 01/24/2021] [Accepted: 06/16/2021] [Indexed: 05/31/2023]
Abstract
The effects of thermal anomalies on tropical coral endosymbiosis can be mediated by a range of environmental factors, which in turn ultimately influence coral health and survival. One such factor is the water flow conditions over coral reefs and corals. Although the physiological benefits of living under high water flow are well known, there remains a lack of conclusive experimental evidence characterizing how flow mitigates thermal stress responses in corals. Here we use in situ measurements of flow in a variety of reef habitats to constrain the importance of flow speeds on the endosymbiosis of an important reef building species under different thermal regimes. Under high flow speeds (0.15 m s-1) and thermal stress, coral endosymbionts retained photosynthetic function and recovery capacity for longer compared to low flow conditions (0.03 m s-1). We hypothesize that this may be due to increased rates of mass transfer of key metabolites under higher flow, putatively allowing corals to maintain photosynthetic efficiency for longer. We also identified a positive interactive effect between high flow and a pre-stress, sub-lethal pulse in temperature. While higher flow may delay the onset of photosynthetic stress, it does not appear to confer long-term protection; sustained exposure to thermal stress (eDHW accumulation equivalent to 4.9°C weeks) eventually overwhelmed the coral meta-organism as evidenced by eventual declines in photo-physiological function and endosymbiont densities. Investigating flow patterns at the scale of metres within the context of these physiological impacts can reveal interesting avenues for coral reef management. This study increases our understanding of the effects of water flow on coral reef health in an era of climate change and highlights the potential to learn from existing beneficial bio-physical interactions for the effective preservation of coral reefs into the future.
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Affiliation(s)
- C E Page
- Life Sciences, Imperial College, Exhibition Road, London SW7 2AZ, UK
- School of Biological, Earth and Environmental Sciences, UNSW, Kensington, High St, New South Wales 2033, Australia
- School of Environmental and Life Sciences, University of Newcastle, University Dr, Callaghan, New South Wales 2308, Australia
| | - W Leggat
- School of Environmental and Life Sciences, University of Newcastle, University Dr, Callaghan, New South Wales 2308, Australia
| | - S F Heron
- Physics and Marine Geophysical Laboratory, College of Science and Engineering, James Cook University, James Cook Dr, Townsville, Queensland 4811, Australia
- NOAA Coral Reef Watch, College Park, MD 20740, USA
| | - A J Fordyce
- School of Environmental and Life Sciences, University of Newcastle, University Dr, Callaghan, New South Wales 2308, Australia
| | - T D Ainsworth
- School of Biological, Earth and Environmental Sciences, UNSW, Kensington, High St, New South Wales 2033, Australia
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15
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Savary R, Barshis DJ, Voolstra CR, Cárdenas A, Evensen NR, Banc-Prandi G, Fine M, Meibom A. Fast and pervasive transcriptomic resilience and acclimation of extremely heat-tolerant coral holobionts from the northern Red Sea. Proc Natl Acad Sci U S A 2021; 118:e2023298118. [PMID: 33941698 PMCID: PMC8126839 DOI: 10.1073/pnas.2023298118] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Corals from the northern Red Sea and Gulf of Aqaba exhibit extreme thermal tolerance. To examine the underlying gene expression dynamics, we exposed Stylophora pistillata from the Gulf of Aqaba to short-term (hours) and long-term (weeks) heat stress with peak seawater temperatures ranging from their maximum monthly mean of 27 °C (baseline) to 29.5 °C, 32 °C, and 34.5 °C. Corals were sampled at the end of the heat stress as well as after a recovery period at baseline temperature. Changes in coral host and symbiotic algal gene expression were determined via RNA-sequencing (RNA-Seq). Shifts in coral microbiome composition were detected by complementary DNA (cDNA)-based 16S ribosomal RNA (rRNA) gene sequencing. In all experiments up to 32 °C, RNA-Seq revealed fast and pervasive changes in gene expression, primarily in the coral host, followed by a return to baseline gene expression for the majority of coral (>94%) and algal (>71%) genes during recovery. At 34.5 °C, large differences in gene expression were observed with minimal recovery, high coral mortality, and a microbiome dominated by opportunistic bacteria (including Vibrio species), indicating that a lethal temperature threshold had been crossed. Our results show that the S. pistillata holobiont can mount a rapid and pervasive gene expression response contingent on the amplitude and duration of the thermal stress. We propose that the transcriptomic resilience and transcriptomic acclimation observed are key to the extraordinary thermal tolerance of this holobiont and, by inference, of other northern Red Sea coral holobionts, up to seawater temperatures of at least 32 °C, that is, 5 °C above their current maximum monthly mean.
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Affiliation(s)
- Romain Savary
- Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland;
| | - Daniel J Barshis
- Department of Biological Sciences, Old Dominion University, Norfolk, VA 23529
| | | | - Anny Cárdenas
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Nicolas R Evensen
- Department of Biological Sciences, Old Dominion University, Norfolk, VA 23529
| | - Guilhem Banc-Prandi
- The Goodman Faculty of Life Sciences, Bar-Ilan University, 52900 Ramat-Gan, Israel
- Laboratory for Coral Reef Ecology, Interuniversity Institute for Marine Sciences, 88103 Eilat, Israel
| | - Maoz Fine
- The Goodman Faculty of Life Sciences, Bar-Ilan University, 52900 Ramat-Gan, Israel
- Laboratory for Coral Reef Ecology, Interuniversity Institute for Marine Sciences, 88103 Eilat, Israel
| | - Anders Meibom
- Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
- Center for Advanced Surface Analysis, Institute of Earth Sciences, University of Lausanne, CH-1015 Lausanne, Switzerland
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16
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Madeira D, Fernandes JF, Jerónimo D, Ricardo F, Santos A, Domingues MR, Calado R. Calcium homeostasis and stable fatty acid composition underpin heatwave tolerance of the keystone polychaete Hediste diversicolor. ENVIRONMENTAL RESEARCH 2021; 195:110885. [PMID: 33609552 DOI: 10.1016/j.envres.2021.110885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 02/09/2021] [Accepted: 02/10/2021] [Indexed: 06/12/2023]
Abstract
Extreme weather events, such as heatwaves, are becoming increasingly frequent, long-lasting and severe as global climate change continues, shaping marine biodiversity patterns worldwide. Increased risk of overheating and mortality across major taxa have been recurrently observed, jeopardizing the sustainability of ecosystem services. Molecular responses of species, which scale up to physiological and population responses, are determinant processes that modulate species sensitivity or tolerance to extreme weather events. Here, by integrating proteomic, fatty acid profiling and physiological approaches, we show that the tolerance of the intertidal ragworm Hediste diversicolor, a keystone species in estuarine ecosystems and an emergent blue bio-resource, to long-lasting heatwaves (24 vs 30 °C for 30 days) is shaped by calcium homeostasis, immune function and stability of fatty acid profiles. These features potentially enabled H. diversicolor to increase its thermal tolerance limit by 0.81 °C under the heatwave scenario and maintain survival. No growth trade-offs were detected, as wet weight remained stable across conditions. Biological variation of physiological parameters was lower when compared to molecular measures. Proteins showed an overall elevated coefficient of variation, although decreasing molecular variance under the heatwave scenario was observed for both proteins and fatty acids. This finding is consistent with the phenomenon of physiological canalization in extreme environments and contradicts the theory that novel conditions increase trait variation. Our results show that keystone highly valued marine polychaetes are tolerant to heatwaves, confirming the potential of H. diversicolor as a blue bio-resource and opening new avenues for sustainable marine aquaculture development.
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Affiliation(s)
- Diana Madeira
- ECOMARE-Laboratory for Innovation and Sustainability of Marine Biological Resources, CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Estrada Do Porto de Pesca Costeira, 3830-565, Gafanha da Nazaré, Portugal; UCIBIO, REQUIMTE, Department of Chemistry, Faculty of Science and Technology, NOVA University of Lisbon, 2829-516, Caparica, Portugal; University of Quebec in Rimouski (UQAR), Department of Biology, Chemistry and Geography, 300 Allée des Ursulines, Rimouski, QC, G5L 3A1, Canada.
| | - Joana Filipa Fernandes
- ECOMARE-Laboratory for Innovation and Sustainability of Marine Biological Resources, CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Estrada Do Porto de Pesca Costeira, 3830-565, Gafanha da Nazaré, Portugal
| | - Daniel Jerónimo
- ECOMARE-Laboratory for Innovation and Sustainability of Marine Biological Resources, CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Estrada Do Porto de Pesca Costeira, 3830-565, Gafanha da Nazaré, Portugal
| | - Fernando Ricardo
- ECOMARE-Laboratory for Innovation and Sustainability of Marine Biological Resources, CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Estrada Do Porto de Pesca Costeira, 3830-565, Gafanha da Nazaré, Portugal
| | - Andreia Santos
- ECOMARE-Laboratory for Innovation and Sustainability of Marine Biological Resources, CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Estrada Do Porto de Pesca Costeira, 3830-565, Gafanha da Nazaré, Portugal
| | - Maria Rosário Domingues
- Mass Spectrometry Centre, LAQV REQUIMTE, Department of Chemistry, University of Aveiro, Santiago University Campus, 3810-193, Aveiro, Portugal; ECOMARE-Laboratory for Innovation and Sustainability of Marine Biological Resources, CESAM-Centre for Environmental and Marine Studies, Department of Chemistry, University of Aveiro, Santiago University Campus, 3810-193, Aveiro, Portugal
| | - Ricardo Calado
- ECOMARE-Laboratory for Innovation and Sustainability of Marine Biological Resources, CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Estrada Do Porto de Pesca Costeira, 3830-565, Gafanha da Nazaré, Portugal.
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17
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Abstract
Climate-driven reef decline has prompted the development of next-generation coral conservation strategies, many of which hinge on the movement of adaptive variation across genetic and environmental gradients. This process is limited by our understanding of how genetic and genotypic drivers of coral bleaching will manifest in different environmental conditions. We reciprocally transplanted 10 genotypes of Acropora cervicornis across eight sites along a 60 km span of the Florida Reef Tract and documented significant genotype × environment interactions in bleaching response during the severe 2015 bleaching event. Performance relative to site mean was significantly different between genotypes and can be mostly explained by ensemble models of correlations with genetic markers. The high explanatory power was driven by significant enrichment of loci associated DNA repair, cell signalling and apoptosis. No genotypes performed above (or below) bleaching average at all sites, so genomic predictors can provide practitioners with 'confidence intervals' about the chance of success in novel habitats. These data have important implications for assisted gene flow and managed relocation, and their integration with traditional active restoration.
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Affiliation(s)
- Crawford Drury
- Department of Marine Biology and Ecology, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL 33149, USA
| | - Diego Lirman
- Department of Marine Biology and Ecology, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL 33149, USA
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18
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Chan WY, Chung J, Peplow LM, Hoffmann AA, van Oppen MJH. Maternal effects in gene expression of interspecific coral hybrids. Mol Ecol 2020; 30:517-527. [PMID: 33179328 DOI: 10.1111/mec.15727] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 11/03/2020] [Accepted: 11/04/2020] [Indexed: 12/24/2022]
Abstract
Maternal effects have been well documented for offspring morphology and life history traits in plants and terrestrial animals, yet little is known about maternal effects in corals. Further, few studies have explored maternal effects in gene expression. In a previous study, F1 interspecific hybrid and purebred larvae of the coral species Acropora tenuis and Acropora loripes were settled and exposed to ambient or elevated temperature and pCO2 conditions for 7 months. At this stage, the hybrid coral recruits from both ocean conditions exhibited strong maternal effects in several fitness traits. We conducted RNA-sequencing on these corals and showed that gene expression of the hybrid Acropora also exhibited clear maternal effects. Only 40 genes were differentially expressed between hybrids and their maternal progenitor. In contrast, ~2000 differentially expressed genes were observed between hybrids and their paternal progenitors, and between the reciprocal F1 hybrids. These results indicate that maternal effects in coral gene expression can be long-lasting. Unlike findings from most short-term stress experiments in corals, no genes were differentially expressed in the hybrid nor purebred offspring after seven months of exposure to elevated temperature and pCO2 conditions.
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Affiliation(s)
- Wing Yan Chan
- Australian Institute of Marine Science, Townsville, QLD, Australia.,School of BioSciences, University of Melbourne, Parkville, VIC, Australia
| | - Jessica Chung
- Bio21 Institute, University of Melbourne, Parkville, VIC, Australia.,Melbourne Bioinformatics, University of Melbourne, Parkville, VIC, Australia
| | - Lesa M Peplow
- Australian Institute of Marine Science, Townsville, QLD, Australia
| | - Ary A Hoffmann
- Bio21 Institute, University of Melbourne, Parkville, VIC, Australia
| | - Madeleine J H van Oppen
- Australian Institute of Marine Science, Townsville, QLD, Australia.,School of BioSciences, University of Melbourne, Parkville, VIC, Australia
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19
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Ottaviani A, Eid R, Zoccola D, Pousse M, Dubal JM, Barajas E, Jamet K, Lebrigand K, Lapébie P, Baudoin C, Giraud-Panis MJ, Rouan A, Beauchef G, Guéré C, Vié K, Barbry P, Tambutté S, Gilson E, Allemand D. Longevity strategies in response to light in the reef coral Stylophora pistillata. Sci Rep 2020; 10:19937. [PMID: 33203910 PMCID: PMC7673115 DOI: 10.1038/s41598-020-76925-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 11/04/2020] [Indexed: 12/15/2022] Open
Abstract
Aging is a multifactorial process that results in progressive loss of regenerative capacity and tissue function while simultaneously favoring the development of a large array of age-related diseases. Evidence suggests that the accumulation of senescent cells in tissue promotes both normal and pathological aging. Oxic stress is a key driver of cellular senescence. Because symbiotic long-lived reef corals experience daily hyperoxic and hypoxic transitions, we hypothesized that these long-lived animals have developed specific longevity strategies in response to light. We analyzed transcriptome variation in the reef coral Stylophora pistillata during the day-night cycle and revealed a signature of the FoxO longevity pathway. We confirmed this pathway by immunofluorescence using antibodies against coral FoxO to demonstrate its nuclear translocation. Through qPCR analysis of nycthemeral variations of candidate genes under different light regimens, we found that, among genes that were specifically up- or downregulated upon exposure to light, human orthologs of two "light-up" genes (HEY1 and LONF3) exhibited anti-senescence properties in primary human fibroblasts. Therefore, these genes are interesting candidates for counteracting skin aging. We propose a large screen for other light-up genes and an investigation of the biological response of reef corals to light (e.g., metabolic switching) to elucidate these processes and identify effective interventions for promoting healthy aging in humans.
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Affiliation(s)
- Alexandre Ottaviani
- Medical School of Nice, CNRS, INSERM, IRCAN, Université Côte d'Azur, Nice, France.
| | - Rita Eid
- Medical School of Nice, CNRS, INSERM, IRCAN, Université Côte d'Azur, Nice, France
| | | | - Mélanie Pousse
- Medical School of Nice, CNRS, INSERM, IRCAN, Université Côte d'Azur, Nice, France
| | - Jean-Marc Dubal
- Medical School of Nice, CNRS, INSERM, IRCAN, Université Côte d'Azur, Nice, France
| | | | - Karine Jamet
- Medical School of Nice, CNRS, INSERM, IRCAN, Université Côte d'Azur, Nice, France
| | - Kevin Lebrigand
- Université Côte d'Azur, CNRS, IPMC, 06560, Sophia Antipolis, France
| | - Pascal Lapébie
- Medical School of Nice, CNRS, INSERM, IRCAN, Université Côte d'Azur, Nice, France
| | - Christian Baudoin
- Medical School of Nice, CNRS, INSERM, IRCAN, Université Côte d'Azur, Nice, France
| | | | - Alice Rouan
- Medical School of Nice, CNRS, INSERM, IRCAN, Université Côte d'Azur, Nice, France
| | - Gallic Beauchef
- Laboratoires Clarins, 12 avenue de la porte des Ternes, 75017, Paris, France
| | - Christelle Guéré
- Laboratoires Clarins, 12 avenue de la porte des Ternes, 75017, Paris, France
| | - Katell Vié
- Laboratoires Clarins, 12 avenue de la porte des Ternes, 75017, Paris, France
| | - Pascal Barbry
- Université Côte d'Azur, CNRS, IPMC, 06560, Sophia Antipolis, France
| | | | - Eric Gilson
- Medical School of Nice, CNRS, INSERM, IRCAN, Université Côte d'Azur, Nice, France. .,Department of Genetics, CHU, Nice, France.
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20
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Dynamic regulation of coral energy metabolism throughout the diel cycle. Sci Rep 2020; 10:19881. [PMID: 33199772 PMCID: PMC7669893 DOI: 10.1038/s41598-020-76828-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Accepted: 10/08/2020] [Indexed: 01/26/2023] Open
Abstract
Coral reefs are naturally exposed to daily and seasonal variations in environmental oxygen levels, which can be exacerbated in intensity and duration by anthropogenic activities. However, coral’s diel oxygen dynamics and fermentative pathways remain poorly understood. Here, continuous oxygen microelectrode recordings in the coral diffusive boundary layer revealed hyperoxia during daytime and hypoxia at nighttime resulting from net photosynthesis and net respiration, respectively. The activities of the metabolic enzymes citrate synthase (CS), malate dehydrogenase, and strombine dehydrogenase remained constant throughout the day/night cycle, suggesting that energy metabolism was regulated through adjustments in metabolite fluxes and not through changes in enzyme abundance. Liquid chromatography-mass spectrometry analyses identified strombine as coral’s main fermentative end product. Strombine levels peaked as oxygen became depleted at dusk, indicating increased fermentation rates at the onset of nightly hypoxia, and again at dawn as photosynthesis restored oxygen and photosynthate supply. When these peaks were excluded from the analyses, average strombine levels during the day were nearly double those at night, indicating sifnificant fermentation rates even during aerobic conditions. These results highlight the dynamic changes in oxygen levels in the coral diffusive boundary layer, and the importance of fermentative metabolism for coral biology.
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21
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Pimsler ML, Oyen KJ, Herndon JD, Jackson JM, Strange JP, Dillon ME, Lozier JD. Biogeographic parallels in thermal tolerance and gene expression variation under temperature stress in a widespread bumble bee. Sci Rep 2020; 10:17063. [PMID: 33051510 PMCID: PMC7553916 DOI: 10.1038/s41598-020-73391-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 09/17/2020] [Indexed: 12/19/2022] Open
Abstract
Global temperature changes have emphasized the need to understand how species adapt to thermal stress across their ranges. Genetic mechanisms may contribute to variation in thermal tolerance, providing evidence for how organisms adapt to local environments. We determine physiological thermal limits and characterize genome-wide transcriptional changes at these limits in bumble bees using laboratory-reared Bombus vosnesenskii workers. We analyze bees reared from latitudinal (35.7-45.7°N) and altitudinal (7-2154 m) extremes of the species' range to correlate thermal tolerance and gene expression among populations from different climates. We find that critical thermal minima (CTMIN) exhibit strong associations with local minimums at the location of queen origin, while critical thermal maximum (CTMAX) was invariant among populations. Concordant patterns are apparent in gene expression data, with regional differentiation following cold exposure, and expression shifts invariant among populations under high temperatures. Furthermore, we identify several modules of co-expressed genes that tightly correlate with critical thermal limits and temperature at the region of origin. Our results reveal that local adaptation in thermal limits and gene expression may facilitate cold tolerance across a species range, whereas high temperature responses are likely constrained, both of which may have implications for climate change responses of bumble bees.
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Affiliation(s)
- Meaghan L Pimsler
- Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL, 35487, USA.
| | - Kennan J Oyen
- Department of Zoology and Physiology and Program in Ecology, University of Wyoming, Laramie, WY, 82071, USA
- Department of Biological Sciences, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - James D Herndon
- USDA-ARS Pollinating Insects Research Unit, Utah State University, Logan, UT, 84322, USA
| | - Jason M Jackson
- Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL, 35487, USA
| | - James P Strange
- USDA-ARS Pollinating Insects Research Unit, Utah State University, Logan, UT, 84322, USA
- Department of Entomology, The Ohio State University, Columbus, OH, 44691, USA
| | - Michael E Dillon
- Department of Zoology and Physiology and Program in Ecology, University of Wyoming, Laramie, WY, 82071, USA
| | - Jeffrey D Lozier
- Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL, 35487, USA.
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22
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Kenkel CD, Mocellin VJL, Bay LK. Global gene expression patterns in Porites white patch syndrome: Disentangling symbiont loss from the thermal stress response in reef-building coral. Mol Ecol 2020; 29:3907-3920. [PMID: 32858771 DOI: 10.1111/mec.15608] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 08/13/2020] [Accepted: 08/14/2020] [Indexed: 12/14/2022]
Abstract
The mechanisms resulting in the breakdown of the coral symbiosis once the process of bleaching has been initiated remain unclear. Distinguishing the process of symbiont loss from the thermal stress response may shed light on the cellular and molecular pathways involved in each process. This study examined physiological changes and global gene expression patterns associated with white patch syndrome (WPS) in Porites lobata, which manifests in localized bleaching independent of thermal stress. In addition, a meta-analysis of global gene expression studies in other corals and anemones was used to contrast differential regulation as a result of disease and thermal stress from patterns correlated with symbiotic state. Symbiont density, chlorophyll a content, holobiont productivity, instant calcification rate, and total host protein content were uniformly reduced in WPS relative to healthy tissue. While expression patterns associated with WPS were secondary to fixed effects of source colony, specific functional enrichments combined with a lack of immune regulation suggest that the viral infection putatively giving rise to this condition affects symbiont rather than host cells. Expression in response to WPS also clustered independently of patterns in white syndrome impacted A. hyacinthus, further supporting a distinct aetiology of this syndrome. Expression patterns in WPS-affected tissues were significantly correlated with prior studies that examined short-term thermal stress responses independent of symbiotic state, suggesting that the majority of expression changes reflect a nonspecific stress response. Across studies, the magnitude and direction of expression change among particular functional enrichments suggests unique responses to stressor duration and highlights distinct responses to bleaching in an anemone model.
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Affiliation(s)
- Carly D Kenkel
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | | | - Line K Bay
- Australian Institute of Marine Science, Townsville, Qld, Australia
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23
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Dixon G, Abbott E, Matz M. Meta-analysis of the coral environmental stress response: Acropora corals show opposing responses depending on stress intensity. Mol Ecol 2020; 29:2855-2870. [PMID: 32615003 DOI: 10.1111/mec.15535] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 05/25/2020] [Accepted: 06/18/2020] [Indexed: 12/15/2022]
Abstract
As climate change progresses, reef-building corals must contend more often with suboptimal conditions, motivating a need to understand coral stress response. Here, we test the hypothesis that there is a stereotyped transcriptional response that corals enact under all stressful conditions, functionally characterized by downregulation of growth, and activation of cell death, response to reactive oxygen species, immunity, and protein folding and degradation. We analyse RNA-seq and Tag-Seq data from 14 previously published studies and supplement them with four new experiments involving different stressors, totaling over 600 gene expression profiles from the genus Acropora. Contrary to expectations, we found not one, but two distinct types of response. The type A response was observed under all kinds of high-intensity stress, was correlated between independent projects and was functionally consistent with the hypothesized stereotyped response. The consistent correlation between projects, irrespective of stress type, supports the type A response as the general coral environmental stress response (ESR), a blanket solution to severely stressful conditions. The distinct type B response was observed under lower intensity stress and was more variable among studies. Unexpectedly, at the level of individual genes and functional categories, the type B response was broadly opposite the type A response. Finally, taking advantage of the breadth of the data set, we present contextual annotations for previously unannotated genes based on consistent stress-induced differences across independent projects.
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Affiliation(s)
- Groves Dixon
- Department of Integrative Biology, University of Texas, Austin, TX, USA
| | - Evelyn Abbott
- Department of Integrative Biology, University of Texas, Austin, TX, USA
| | - Mikhail Matz
- Department of Integrative Biology, University of Texas, Austin, TX, USA
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24
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Glazier A, Herrera S, Weinnig A, Kurman M, Gómez CE, Cordes E. Regulation of ion transport and energy metabolism enables certain coral genotypes to maintain calcification under experimental ocean acidification. Mol Ecol 2020; 29:1657-1673. [PMID: 32286706 DOI: 10.1111/mec.15439] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Revised: 03/27/2020] [Accepted: 03/30/2020] [Indexed: 12/23/2022]
Abstract
Cold-water corals (CWCs) are important foundation species in the world's largest ecosystem, the deep sea. They support a rich faunal diversity but are threatened by climate change and increased ocean acidification. As part of this study, fragments from three genetically distinct Lophelia pertusa colonies were subjected to ambient pH (pH = 7.9) and low pH (pH = 7.6) for six months. RNA was sampled at two, 4.5, and 8.5 weeks and sequenced. The colony from which the fragments were sampled explained most of the variance in expression patterns, but a general pattern emerged where upregulation of ion transport, required to maintain normal function and calcification, was coincident with lowered expression of genes involved in metabolic processes; RNA regulation and processing in particular. Furthermore, there was no differential expression of carbonic anhydrase detected in any analyses, which agrees with a previously described lack of response in enzyme activity in the same corals. However, one colony was able to maintain calcification longer than the other colonies when exposed to low pH and showed increased expression of ion transport genes including proton transport and expression of genes associated with formation of microtubules and the organic matrix, suggesting that certain genotypes may be better equipped to cope with ocean acidification in the future. While these genotypes exist in the contemporary gene pool, further stresses would reduce the genetic variability of the species, which would have repercussions for the maintenance of existing populations and the ecosystem as a whole.
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Affiliation(s)
- Amanda Glazier
- Biology Department, Temple University, Philadelphia, PA, USA
| | - Santiago Herrera
- Department of Biological Sciences, Lehigh University, Bethlehem, PA, USA
| | - Alexis Weinnig
- Biology Department, Temple University, Philadelphia, PA, USA
| | - Melissa Kurman
- Biology Department, Temple University, Philadelphia, PA, USA.,First Hand, University City Science Center Philadelphia, PA, USA
| | - Carlos E Gómez
- Biology Department, Temple University, Philadelphia, PA, USA.,Departamento de Ciencias Biológicas, Universidad de los Andes, Bogotá, Colombia
| | - Erik Cordes
- Biology Department, Temple University, Philadelphia, PA, USA
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25
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Drury C. Resilience in reef-building corals: The ecological and evolutionary importance of the host response to thermal stress. Mol Ecol 2020; 29:448-465. [PMID: 31845413 DOI: 10.1111/mec.15337] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 12/05/2019] [Accepted: 12/11/2019] [Indexed: 02/06/2023]
Abstract
Coral reefs are under extreme threat due to a number of stressors, but temperature increases due to changing climate are the most severe. Rising ocean temperatures coupled with local extremes lead to extensive bleaching, where the coral-algal symbiosis breaks down and corals may die, compromising the structure and function of reefs. Although the symbiotic nature of the coral colony has historically been a focus of research on coral resilience, the host itself is a foundational component in the response to thermal stress. Fixed effects in the coral host set trait baselines through evolutionary processes, acting on many loci of small effect to create mosaics of thermal tolerance across latitudes and individual coral reefs. These genomic differences can be strongly heritable, producing wide variation among clones of different genotypes or families of a specific larval cross. Phenotypic plasticity is overlaid on these baselines and a growing body of knowledge demonstrates the potential for acclimatization of reef-building corals through a variety of mechanisms that promote resilience and stress tolerance. The long-term persistence of coral reefs will require many of these mechanisms to adjust to warmer temperatures within a generation, bridging the gap to reproductive events that allow recombination of standing diversity and adaptive change. Business-as-usual climate scenarios will probably lead to the loss of some coral populations or species in the future, so the interaction between intragenerational effects and evolutionary pressure is critical for the survival of reefs.
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26
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Cleves PA, Shumaker A, Lee J, Putnam HM, Bhattacharya D. Unknown to Known: Advancing Knowledge of Coral Gene Function. Trends Genet 2019; 36:93-104. [PMID: 31882190 DOI: 10.1016/j.tig.2019.11.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 10/31/2019] [Accepted: 11/06/2019] [Indexed: 12/18/2022]
Abstract
Given the catastrophic changes befalling coral reefs, understanding coral gene function is essential to advance reef conservation. This has proved challenging due to the paucity of genomic data and genetic tools available for corals. Recently, CRISPR/Cas9 gene editing was applied to these species; however, a major bottleneck is the identification and prioritization of candidate genes for manipulation. This issue is exacerbated by the many unknown ('dark') coral genes that may play key roles in the stress response. We review the use of gene coexpression networks that incorporate both known and unknown genes to identify targets for reverse genetic analysis. This approach also provides a framework for the annotation of dark genes in established interaction networks to improve our fundamental knowledge of coral gene function.
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Affiliation(s)
- Phillip A Cleves
- Department of Genetics, Stanford University, Stanford, CA 94305, USA
| | - Alexander Shumaker
- Microbial Biology Graduate Program, Rutgers University, New Brunswick, NJ 08901, USA
| | - JunMo Lee
- Department of Biochemistry and Microbiology, Rutgers University, New Brunswick, NJ 08901, USA; Current address: Department of Oceanography, Kyungpook National University, Daegu 41566, Korea
| | - Hollie M Putnam
- Department of Biological Sciences, University of Rhode Island, Kingston, RI 02881, USA
| | - Debashish Bhattacharya
- Department of Biochemistry and Microbiology, Rutgers University, New Brunswick, NJ 08901, USA.
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27
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Thermal Stress and Resilience of Corals in a Climate-Changing World. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2019. [DOI: 10.3390/jmse8010015] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Coral reef ecosystems are under the direct threat of increasing atmospheric greenhouse gases, which increase seawater temperatures in the oceans and lead to bleaching events. Global bleaching events are becoming more frequent and stronger, and understanding how corals can tolerate and survive high-temperature stress should be accorded paramount priority. Here, we review evidence of the different mechanisms that corals employ to mitigate thermal stress, which include association with thermally tolerant endosymbionts, acclimatisation, and adaptation processes. These differences highlight the physiological diversity and complexity of symbiotic organisms, such as scleractinian corals, where each species (coral host and microbial endosymbionts) responds differently to thermal stress. We conclude by offering some insights into the future of coral reefs and examining the strategies scientists are leveraging to ensure the survival of this valuable ecosystem. Without a reduction in greenhouse gas emissions and a divergence from our societal dependence on fossil fuels, natural mechanisms possessed by corals might be insufficient towards ensuring the ecological functioning of coral reef ecosystems.
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28
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López EH, Palumbi SR. Somatic Mutations and Genome Stability Maintenance in Clonal Coral Colonies. Mol Biol Evol 2019; 37:828-838. [DOI: 10.1093/molbev/msz270] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
AbstractOne challenge for multicellular organisms is maintaining genome stability in the face of mutagens across long life spans. Imperfect genome maintenance leads to mutation accumulation in somatic cells, which is associated with tumors and senescence in vertebrates. Colonial reef-building corals are often large, can live for hundreds of years, rarely develop recognizable tumors, and are thought to convert somatic cells into gamete producers, so they are a pivotal group in which to understand long-term genome maintenance. To measure rates and patterns of somatic mutations, we analyzed transcriptomes from 17 to 22 branches from each of four Acropora hyacinthus colonies, determined putative single nucleotide variants, and verified them with Sanger resequencing. Unlike for human skin carcinomas, there is no signature of mutations caused by UV damage, indicating either higher efficiency of repair than in vertebrates, or strong sunscreen protection in these shallow water tropical animals. The somatic mutation frequency per nucleotide in A. hyacinthus is on the same order of magnitude (10−7) as noncancerous human somatic cells, and accumulation of mutations with age is similar. Loss of heterozygosity variants outnumber gain of heterozygosity mutations ∼2:1. Although the mutation frequency is similar in mammals and corals, the preponderance of loss of heterozygosity changes and potential selection may reduce the frequency of deleterious mutations in colonial animals like corals. This may limit the deleterious effects of somatic mutations on the coral organism as well as potential offspring.
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Affiliation(s)
- Elora H López
- Biology Department, Hopkins Marine Station, Stanford University, Pacific Grove, CA
| | - Stephen R Palumbi
- Biology Department, Hopkins Marine Station, Stanford University, Pacific Grove, CA
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29
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Schoepf V, Carrion SA, Pfeifer SM, Naugle M, Dugal L, Bruyn J, McCulloch MT. Stress-resistant corals may not acclimatize to ocean warming but maintain heat tolerance under cooler temperatures. Nat Commun 2019; 10:4031. [PMID: 31530800 PMCID: PMC6748961 DOI: 10.1038/s41467-019-12065-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 08/13/2019] [Indexed: 11/27/2022] Open
Abstract
Naturally heat-resistant coral populations hold significant potential for facilitating coral reef survival under rapid climate change. However, it remains poorly understood whether they can acclimatize to ocean warming when superimposed on their already thermally-extreme habitats. Furthermore, it is unknown whether they can maintain their heat tolerance upon larval dispersal or translocation to cooler reefs. We test this in a long-term mesocosm experiment using stress-resistant corals from thermally-extreme reefs in NW Australia. We show that these corals have a remarkable ability to maintain their heat tolerance and health despite acclimation to 3-6 °C cooler, more stable temperatures over 9 months. However, they are unable to increase their bleaching thresholds after 6-months acclimation to + 1 °C warming. This apparent rigidity in the thermal thresholds of even stress-resistant corals highlights the increasing vulnerability of corals to ocean warming, but provides a rationale for human-assisted migration to restore cooler, degraded reefs with corals from thermally-extreme reefs.
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Affiliation(s)
- Verena Schoepf
- Oceans Graduate School and UWA Oceans Institute, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia.
- ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia.
| | - Steven A Carrion
- Oceans Graduate School and UWA Oceans Institute, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia
- School of Geosciences, University of Edinburgh, James Hutton Road, Edinburgh, EH9 3FE, UK
| | - Svenja M Pfeifer
- Oceans Graduate School and UWA Oceans Institute, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia
- Department of Biology, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, 40225, Düsseldorf, Germany
| | - Melissa Naugle
- Oceans Graduate School and UWA Oceans Institute, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia
| | - Laurence Dugal
- Oceans Graduate School and UWA Oceans Institute, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia
| | - Jennifer Bruyn
- Oceans Graduate School and UWA Oceans Institute, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia
| | - Malcolm T McCulloch
- Oceans Graduate School and UWA Oceans Institute, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia
- ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia
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30
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Wuitchik DM, Wang D, Pells TJ, Karimi K, Ward S, Vize PD. Seasonal temperature, the lunar cycle and diurnal rhythms interact in a combinatorial manner to modulate genomic responses to the environment in a reef-building coral. Mol Ecol 2019; 28:3629-3641. [PMID: 31294494 PMCID: PMC6851572 DOI: 10.1111/mec.15173] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 06/14/2019] [Accepted: 06/28/2019] [Indexed: 12/15/2022]
Abstract
Rhythms of various periodicities drive cyclical processes in organisms ranging from single cells to the largest mammals on earth, and on scales from cellular physiology to global migrations. The molecular mechanisms that generate circadian behaviours in model organisms have been well studied, but longer phase cycles and interactions between cycles with different periodicities remain poorly understood. Broadcast spawning corals are one of the best examples of an organism integrating inputs from multiple environmental parameters, including seasonal temperature, the lunar phase and hour of the day, to calibrate their annual reproductive event. We present a deep RNA-sequencing experiment utilizing multiple analyses to differentiate transcriptomic responses modulated by the interactions between the three aforementioned environmental parameters. Acropora millepora was sampled over multiple 24-hr periods throughout a full lunar month and at two seasonal temperatures. Temperature, lunar and diurnal cycles produce distinct transcriptomic responses, with interactions between all three variables identifying a core set of genes. These core genes include mef2, a developmental master regulator, and two heterogeneous nuclear ribonucleoproteins, one of which is known to post-transcriptionally interact with mef2 and with biological clock-regulating mRNAs. Interactions between diurnal and temperature differences impacted a range of core processes ranging from biological clocks to stress responses. Genes involved with developmental processes and transcriptional regulation were impacted by the lunar phase and seasonal temperature differences. Lastly, there was a diurnal and lunar phase interaction in which genes involved with RNA-processing and translational regulation were differentially regulated. These data illustrate the extraordinary levels of transcriptional variation across time in a simple radial cnidarian in response to the environment under normal conditions.
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Affiliation(s)
- Daniel M Wuitchik
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| | - DongZhuo Wang
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| | - Troy J Pells
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| | - Kamran Karimi
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| | - Selina Ward
- Department of Biological Sciences, The University of Queensland, St. Lucia, Qld, Australia
| | - Peter D Vize
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada.,Department of Biological Sciences, The University of Queensland, St. Lucia, Qld, Australia
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31
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Thomas L, López EH, Morikawa MK, Palumbi SR. Transcriptomic resilience, symbiont shuffling, and vulnerability to recurrent bleaching in reef‐building corals. Mol Ecol 2019; 28:3371-3382. [DOI: 10.1111/mec.15143] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 05/14/2019] [Accepted: 06/04/2019] [Indexed: 12/22/2022]
Affiliation(s)
- Luke Thomas
- Australian Institute of Marine Science, Indian Ocean Marine Research Centre Perth WA Australia
- Oceans Graduate School The UWA Oceans Institute, The University of Western Australia Perth WA Australia
- Biology Department, Hopkins Marine Station Stanford University Stanford CA USA
| | - Elora H. López
- Biology Department, Hopkins Marine Station Stanford University Stanford CA USA
| | - Megan K. Morikawa
- Biology Department, Hopkins Marine Station Stanford University Stanford CA USA
| | - Stephen R. Palumbi
- Biology Department, Hopkins Marine Station Stanford University Stanford CA USA
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32
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Dimos BA, Mahmud SA, Fuess LE, Mydlarz LD, Pellegrino MW. Uncovering a mitochondrial unfolded protein response in corals and its role in adapting to a changing world. Proc Biol Sci 2019; 286:20190470. [PMID: 31238849 PMCID: PMC6599992 DOI: 10.1098/rspb.2019.0470] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The Anthropocene will be characterized by increased environmental disturbances, leading to the survival of stress-tolerant organisms, particularly in the oceans, where novel marine diseases and elevated temperatures are re-shaping ecosystems. These environmental changes underscore the importance of identifying mechanisms which promote stress tolerance in ecologically important non-model species such as reef-building corals. Mitochondria are central regulators of cellular stress and have dedicated recovery pathways including the mitochondrial unfolded protein response, which increases the transcription of protective genes promoting protein homeostasis, free radical detoxification and innate immunity. In this investigation, we identify a mitochondrial unfolded protein response in the endangered Caribbean coral Orbicella faveolata, by performing in vivo functional replacement using a transcription factor (Of-ATF5) originating from a coral in the model organism Caenorhabditis elegans. In addition, we use RNA-seq network analysis and transcription factor-binding predictions to identify a transcriptional network of genes likely to be regulated by Of-ATF5 which is induced during the immune challenge and temperature stress. Overall, our findings uncover a conserved cellular pathway which may promote the ability of reef-building corals to survive increasing levels of environmental stress.
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Affiliation(s)
- Bradford A Dimos
- Department of Biology, University of Texas at Arlington , Arlington, TX 76019 , USA
| | - Siraje A Mahmud
- Department of Biology, University of Texas at Arlington , Arlington, TX 76019 , USA
| | - Lauren E Fuess
- Department of Biology, University of Texas at Arlington , Arlington, TX 76019 , USA
| | - Laura D Mydlarz
- Department of Biology, University of Texas at Arlington , Arlington, TX 76019 , USA
| | - Mark W Pellegrino
- Department of Biology, University of Texas at Arlington , Arlington, TX 76019 , USA
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33
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Page CE, Leggat W, Heron SF, Choukroun SM, Lloyd J, Ainsworth TD. Seeking Resistance in Coral Reef Ecosystems: The Interplay of Biophysical Factors and Bleaching Resistance under a Changing Climate. Bioessays 2019; 41:e1800226. [DOI: 10.1002/bies.201800226] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 04/01/2019] [Indexed: 01/17/2023]
Affiliation(s)
- Charlotte E. Page
- Department of Life Sciences Imperial College London Kensington London SW7 2AZ UK
- School of Environmental and Life Sciences University of Newcastle University Dr Callaghan NSW 2308 Australia
- School of Biological Earth and Environmental Sciences (BEES), UNSW Kensington NSW 2033 Australia
| | - William Leggat
- School of Environmental and Life Sciences University of Newcastle University Dr Callaghan NSW 2308 Australia
| | - Scott F. Heron
- Coral Reef Watch U.S. National Oceanic and Atmospheric Administration College Park MD 20740 USA
- Marine Geophysical Laboratory, Physics Department, College of Science and Engineering James Cook University Townsville QLD 4811 Australia
| | - Severine M. Choukroun
- ARC Centre of Excellence for Coral Reef Studies James Cook University Townsville QLD 4811 Australia
| | - Jon Lloyd
- Department of Life Sciences Imperial College London Kensington London SW7 2AZ UK
| | - Tracy D. Ainsworth
- School of Biological Earth and Environmental Sciences (BEES), UNSW Kensington NSW 2033 Australia
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34
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Dziedzic KE, Elder H, Tavalire H, Meyer E. Heritable variation in bleaching responses and its functional genomic basis in reef‐building corals (
Orbicella faveolata
). Mol Ecol 2019; 28:2238-2253. [DOI: 10.1111/mec.15081] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Revised: 03/02/2019] [Accepted: 03/06/2019] [Indexed: 12/17/2022]
Affiliation(s)
| | - Holland Elder
- Department of Integrative Biology Oregon State University Corvallis Oregon
| | - Hannah Tavalire
- Institute of Ecology and Evolution University of Oregon Eugene Oregon
- Prevention Science Institute University of Oregon Eugene Oregon
| | - Eli Meyer
- Department of Integrative Biology Oregon State University Corvallis Oregon
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35
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Olguín-López N, Hérnandez-Elizárraga VH, Hernández-Matehuala R, Cruz-Hernández A, Guevara-González R, Caballero-Pérez J, Ibarra-Alvarado C, Rojas-Molina A. Impact of El Niño-Southern Oscillation 2015-2016 on the soluble proteomic profile and cytolytic activity of Millepora alcicornis ("fire coral") from the Mexican Caribbean. PeerJ 2019; 7:e6593. [PMID: 30918755 PMCID: PMC6428038 DOI: 10.7717/peerj.6593] [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: 11/15/2018] [Accepted: 02/09/2019] [Indexed: 12/24/2022] Open
Abstract
Reef-forming cnidarians are extremely susceptible to the “bleaching” phenomenon caused by global warming. The effect of elevated seawater temperature has been extensively studied on Anthozoans; however, to date the impact of thermal stress on the expression of genes and proteins in Hydrozoan species has not been investigated. The present study aimed to determine the differential proteomic profile of Millepora alcicornis, which inhabits the Mexican Caribbean, in response to the El Niño-Southern Oscillation 2015–2016. Additionally, the cytolytic activity of the soluble proteomes obtained from normal and bleached M. alcicornis was assessed. Bleached specimens showed decreased symbiont’s density and chlorophyll a and c2 levels. After bleaching, we observed a differential expression of 17 key proteins, tentatively identified as related to exocytosis, calcium homeostasis, cytoskeletal organization, and potential toxins, including a metalloprotease, a phospholipase A2 (PLA2), and an actitoxin. Although, some of the differentially expressed proteins included potential toxins, the hemolytic, PLA2, and proteolytic activities elicited by the soluble proteomes from bleached and normal specimens were not significantly different. The present study provides heretofore-unknown evidence that thermal stress produces a differential expression of proteins involved in essential cellular processes of Hydrozoan species. Even though our results showed an over-expression of some potential toxin-related proteins, the cytolytic effect (as assessed by hemolytic, PLA2, and caseinolytic activities) was not increased in bleached M. alcicornis, which suggests that the cytolysis is mainly produced by toxins whose expression was not affected by temperature stress. These findings allow hypothesizing that this hydrocoral is able to prey heterotrophically when suffering from moderate bleaching, giving it a better chance to withstand the effects of high temperature.
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Affiliation(s)
- Norma Olguín-López
- Posgrado en Ciencias Químico Biológicas-Facultad de Química, Universidad Autónoma de Querétaro, Querétaro, Querétaro, Mexico.,Laboratorio de Investigación Química y Farmacológica de Productos Naturales, Facultad de Química, Universidad Autónoma de Querétaro, Querétaro, Querétaro, Mexico
| | - Víctor Hugo Hérnandez-Elizárraga
- Posgrado en Ciencias Químico Biológicas-Facultad de Química, Universidad Autónoma de Querétaro, Querétaro, Querétaro, Mexico.,Laboratorio de Investigación Química y Farmacológica de Productos Naturales, Facultad de Química, Universidad Autónoma de Querétaro, Querétaro, Querétaro, Mexico
| | - Rosalina Hernández-Matehuala
- Posgrado en Ciencias Químico Biológicas-Facultad de Química, Universidad Autónoma de Querétaro, Querétaro, Querétaro, Mexico.,Laboratorio de Investigación Química y Farmacológica de Productos Naturales, Facultad de Química, Universidad Autónoma de Querétaro, Querétaro, Querétaro, Mexico
| | - Andrés Cruz-Hernández
- Laboratorio de Biología Molecular-Escuela de Agronomía, Universidad De la Salle Bajío, León, Guanajuato, México
| | - Ramón Guevara-González
- C.A Ingeniería de Biosistemas-Facultad de Ingeniería-Campus Amazcala, Universidad Autónoma de Querétaro, Querétaro, Querétaro, Mexico
| | - Juan Caballero-Pérez
- Facultad de Química, Universidad Autónoma de Querétaro, Querétaro, Querétaro, Mexico
| | - César Ibarra-Alvarado
- Laboratorio de Investigación Química y Farmacológica de Productos Naturales, Facultad de Química, Universidad Autónoma de Querétaro, Querétaro, Querétaro, Mexico
| | - Alejandra Rojas-Molina
- Laboratorio de Investigación Química y Farmacológica de Productos Naturales, Facultad de Química, Universidad Autónoma de Querétaro, Querétaro, Querétaro, Mexico
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Aguilar C, Raina JB, Fôret S, Hayward DC, Lapeyre B, Bourne DG, Miller DJ. Transcriptomic analysis reveals protein homeostasis breakdown in the coral Acropora millepora during hypo-saline stress. BMC Genomics 2019; 20:148. [PMID: 30786881 PMCID: PMC6381741 DOI: 10.1186/s12864-019-5527-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 02/13/2019] [Indexed: 11/18/2022] Open
Abstract
Background Coral reefs can experience salinity fluctuations due to rainfall and runoff; these events can have major impacts on the corals and lead to bleaching and mortality. On the Great Barrier Reef (GBR), low salinity events, which occur during summer seasons and can involve salinity dropping ~ 10 PSU correlate with declines in coral cover, and these events are predicted to increase in frequency and severity under future climate change scenarios. In other marine invertebrates, exposure to low salinity causes increased expression of genes involved in proteolysis, responses to oxidative stress, and membrane transport, but the effects that changes in salinity have on corals have so far received only limited attention. To better understand the coral response to hypo-osmotic stress, here we investigated the transcriptomic response of the coral Acropora millepora in both adult and juvenile life stages to acute (1 h) and more prolonged (24 h) exposure to low salinity. Results Differential gene expression analysis revealed the involvement of both common and specific response mechanisms in Acropora. The general response to environmental stressors included up-regulation of genes involved in the mitigation of macromolecular and oxidative damage, while up-regulation of genes involved in amino acid metabolism and transport represent specific responses to salinity stress. Conclusions This study is the first comprehensive transcriptomic analysis of the coral response to low salinity stress and provides important insights into the likely consequences of heavy rainfall and runoff events on coral reefs. Electronic supplementary material The online version of this article (10.1186/s12864-019-5527-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Catalina Aguilar
- AIMS@JCU and Department of Molecular and Cell Biology, James Cook University, Townsville, Queensland, 4811, Australia.,ARC Centre of Excellence for Coral Reef Studies and Department of Molecular and Cell Biology, James Cook University, Townsville, Queensland, 4811, Australia.,Cooperative Institute for Marine and Atmospheric Studies, Rosenstiel School of Marine & Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida, 33149, USA.,Atlantic Oceanographic and Meteorological Laboratories (AOML), NOAA, 4301 Rickenbacker Causeway, Miami, Florida, 33149, USA
| | - Jean-Baptiste Raina
- AIMS@JCU and Department of Molecular and Cell Biology, James Cook University, Townsville, Queensland, 4811, Australia.,Climate Change Cluster (C3), University of Technology, Sydney, NSW, 2007, Australia
| | - Sylvain Fôret
- ARC Centre of Excellence for Coral Reef Studies and Department of Molecular and Cell Biology, James Cook University, Townsville, Queensland, 4811, Australia.,Division of Ecology and Evolution, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - David C Hayward
- Division of Ecology and Evolution, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - Bruno Lapeyre
- Laboratoire d'excellence CORAIL, Centre de Recherches Insulaires et Observatoire de l'Environnement (CRIOBE), Moorea, B.P.1013, Papeete, French Polynesia
| | - David G Bourne
- AIMS@JCU and Department of Molecular and Cell Biology, James Cook University, Townsville, Queensland, 4811, Australia.,Australian Institute of Marine Science, Townsville, Queensland, 4810, Australia.,College of Science and Engineering, James Cook University, Townsville, 4811, Australia
| | - David J Miller
- AIMS@JCU and Department of Molecular and Cell Biology, James Cook University, Townsville, Queensland, 4811, Australia. .,ARC Centre of Excellence for Coral Reef Studies and Department of Molecular and Cell Biology, James Cook University, Townsville, Queensland, 4811, Australia.
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37
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Johnson KM, Wong JM, Hoshijima U, Sugano CS, Hofmann GE. Seasonal transcriptomes of the Antarctic pteropod, Limacina helicina antarctica. MARINE ENVIRONMENTAL RESEARCH 2019; 143:49-59. [PMID: 30448238 DOI: 10.1016/j.marenvres.2018.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 10/11/2018] [Accepted: 10/12/2018] [Indexed: 06/09/2023]
Abstract
High latitude seas will be among the first marine systems to be impacted by ocean acidification (OA). Previous research studying the effects of OA on the pteropod, Limacina helicina antarctica, has led this species to be identified as a sentinel organism for OA in polar oceans. Here, we present gene expression data on L. h. antarctica, collected in situ during the seasonal transition from early spring to early summer. Our findings suggest that after over-wintering under seasonal sea ice, pteropods progress toward full maturity in the early summer when food becomes increasingly available. This progression is highlighted by a dramatic shift in gene expression that supports the development of cytoskeletal structures, membrane ion transportation, and metabolically important enzymes associated with glycolysis. In addition, we observed signs of defense of genomic integrity and maturation as evidenced by an up-regulation of genes involved in DNA replication, DNA repair, and gametogenesis. These data contribute to a broader understanding of the life-cycle dynamics for L. h. antarctica and provide key insights into the transcriptomic signals of pteropod maturation and growth during this key seasonal transition.
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Affiliation(s)
- Kevin M Johnson
- Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA, 93106, USA; Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, 70803, USA.
| | - Juliet M Wong
- Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA, 93106, USA
| | - Umihiko Hoshijima
- Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA, 93106, USA
| | - Cailan S Sugano
- Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA, 93106, USA; Scripps Institute of Oceanography, University of California San Diego, La Jolla, CA, 92093, USA
| | - Gretchen E Hofmann
- Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA, 93106, USA
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Kirk NL, Howells EJ, Abrego D, Burt JA, Meyer E. Genomic and transcriptomic signals of thermal tolerance in heat‐tolerant corals (
Platygyra daedalea
) of the Arabian/Persian Gulf. Mol Ecol 2018; 27:5180-5194. [DOI: 10.1111/mec.14934] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 10/13/2018] [Accepted: 10/15/2018] [Indexed: 12/21/2022]
Affiliation(s)
- Nathan L. Kirk
- Department of Integrative BiologyOregon State University Corvallis Oregon
| | - Emily J. Howells
- Center for Genomics and Systems BiologyNew York University Abu Dhabi Abu Dhabi UAE
| | - David Abrego
- Department of Natural Science and Public HealthZayed University Abu Dhabi UAE
| | - John A. Burt
- Center for Genomics and Systems BiologyNew York University Abu Dhabi Abu Dhabi UAE
| | - Eli Meyer
- Department of Integrative BiologyOregon State University Corvallis Oregon
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Xiao R, Zhou H, Chen CM, Cheng H, Li H, Xie J, Zhao H, Han Q, Diao X. Transcriptional responses of Acropora hyacinthus embryo under the benzo(a)pyrene stress by deep sequencing. CHEMOSPHERE 2018; 206:387-397. [PMID: 29754063 DOI: 10.1016/j.chemosphere.2018.04.149] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 04/20/2018] [Accepted: 04/23/2018] [Indexed: 06/08/2023]
Abstract
Coral embryos are a critical and sensitive period for the early growth and development of coral. Benzo(a)pyrene (BaP) is widely distributed in the ocean and has strong toxicity, but there is little information on the toxic effects to coral embryos exposed to this widespread environmental contaminant. Thus, in this study, we utilized the Illumina Hiseq™ 4000 platform to explore the gene response of Acropora hyacinthus embryos under the BaP stress. A total of 130,042 Unigenes were obtained and analyzed, and approximately 37.67% of those matched with sequences from four different species. In total, 2606 Unigenes were up-regulated, and 3872 Unigenes were down-regulated. After Gene Ontology (GO) annotation, the results show that the "cellular process" and "metabolic process" were leading in the category of biological processes, which the "binding" and "catalytic activity" were the most abundant subcategories in molecular function. Based on the Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis, the most differentially expressed genes (DEGs) were enriched, as well as down-regulated in the pathways of oxidative phosphorylation, metabolism of xenobiotics, immune-related genes, apoptosis and human disease genes. At the same time, 388,197 of Single-nucleotide Polymorphisms (SNPs) and 6164 of Simple Sequence Repeats (SSRs) were obtained, which can be served as the richer and more valuable SSRs molecular markers in the future. The results of this study can help to better understand the toxicological mechanism of coral embryo exposed to BaP, and it is also essential for the protection and restoration of coral reef ecosystem in the future.
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Affiliation(s)
- Rong Xiao
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
| | - Hailong Zhou
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China.
| | - Chien-Min Chen
- Department of Environmental Resources Management, Chia Nan University of Pharmacy & Science, Tainan, Taiwan, China
| | - Huamin Cheng
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
| | - Hongwu Li
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; College of Ocean, Hainan University, Haikou 570228, China
| | - Jia Xie
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; College of Ocean, Hainan University, Haikou 570228, China
| | - Hongwei Zhao
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
| | - Qian Han
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
| | - Xiaoping Diao
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China; Ministry of Education Key Laboratory of Tropical Island Ecology, Hainan Normal University, Haikou, 571158, China.
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40
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Franzellitti S, Airi V, Calbucci D, Caroselli E, Prada F, Voolstra CR, Mass T, Falini G, Fabbri E, Goffredo S. Transcriptional response of the heat shock gene hsp70 aligns with differences in stress susceptibility of shallow-water corals from the Mediterranean Sea. MARINE ENVIRONMENTAL RESEARCH 2018; 140:444-454. [PMID: 30055833 DOI: 10.1016/j.marenvres.2018.07.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Revised: 07/09/2018] [Accepted: 07/13/2018] [Indexed: 06/08/2023]
Abstract
Shallow-water corals of the Mediterranean Sea are facing a dramatic increase in water temperature due to climate change, predicted to increase the frequency of bleaching and mass mortality events. However, supposedly not all corals are affected equally, as they show differences in stress susceptibility, as suggested by physiological outputs of corals along temperature gradients and under controlled conditions in terms of reproduction, demography, growth, calcification, and photosynthetic efficiency. In this study, gene expression and induction of a 70-kDa heat shock protein (HSP70) was analyzed in five common shallow-water hard corals in the Mediterranean Sea, namely Astroides calycularis, Balanophyllia europaea, Caryophyllia inornata, Cladocora caespitosa, and Leptopsammia pruvoti. The main aim was to assess the contribution of this evolutionary conserved cytoprotective mechanism to the physiological plasticity of these species that possess different growth modes (solitary vs colonial) and trophic strategies (zooxanthellate vs azooxanthellate). Using quantitative real-time PCR, in situ hsp70 baseline levels and expression profiles after a heat-shock exposure were assessed. Levels of hsp70 and heat stress induction were higher in zooxanthellate than in azooxanthellate species, and different heat stress transcriptional profiles were observed between colonial and solitary zooxanthellate corals. On the whole, the hsp70 transcriptional response to heat stress aligns with stress susceptibility of the species and suggests a contribution of trophic strategy and morphology in shaping coral resilience to stress. Understanding these molecular processes may contribute to assess the potential effects and relative resilience of Mediterranean corals under climate change.
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Affiliation(s)
- Silvia Franzellitti
- Animal and Environmental Physiology Laboratory, Department of Biological, Geological and Environmental Sciences, University of Bologna, via S. Alberto 163, I-48123, Ravenna, Italy.
| | - Valentina Airi
- Marine Science Group, Department of Biological, Geological and Environmental Sciences, University of Bologna, Via F. Selmi 3, I-40126, Bologna, Italy
| | - Diana Calbucci
- Animal and Environmental Physiology Laboratory, Department of Biological, Geological and Environmental Sciences, University of Bologna, via S. Alberto 163, I-48123, Ravenna, Italy
| | - Erik Caroselli
- Marine Science Group, Department of Biological, Geological and Environmental Sciences, University of Bologna, Via F. Selmi 3, I-40126, Bologna, Italy
| | - Fiorella Prada
- Marine Science Group, Department of Biological, Geological and Environmental Sciences, University of Bologna, Via F. Selmi 3, I-40126, Bologna, Italy
| | - Christian R Voolstra
- Red Sea Research Center, Division of Biological and Environmental Science and Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Tali Mass
- Department of Marine Biology, The Leon H. Charney School of Marine Sciences, University of Haifa, Multi Purpose Boulevard, Mt. Carmel, Haifa, 3498838, Israel
| | - Giuseppe Falini
- Department of Chemistry "Giacomo Ciamician", University of Bologna, via F. Selmi 2, I-40126, Bologna, Italy
| | - Elena Fabbri
- Animal and Environmental Physiology Laboratory, Department of Biological, Geological and Environmental Sciences, University of Bologna, via S. Alberto 163, I-48123, Ravenna, Italy
| | - Stefano Goffredo
- Marine Science Group, Department of Biological, Geological and Environmental Sciences, University of Bologna, Via F. Selmi 3, I-40126, Bologna, Italy
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41
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Zhang Y, Zhou Z, Wang L, Huang B. Transcriptome, expression, and activity analyses reveal a vital heat shock protein 70 in the stress response of stony coral Pocillopora damicornis. Cell Stress Chaperones 2018; 23:711-721. [PMID: 29435724 PMCID: PMC6045544 DOI: 10.1007/s12192-018-0883-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Revised: 01/25/2018] [Accepted: 01/30/2018] [Indexed: 12/29/2022] Open
Abstract
Coral bleaching occurs worldwide with increasing frequencies and intensities, which is caused by the stress response of stony coral to environmental change, especially increased sea surface temperature. In the present study, transcriptome, expression, and activity analyses were employed to illustrate the underlying molecular mechanisms of heat shock protein 70 (HSP70) in the stress response of coral to environmental changes. The domain analyses of assembled transcripts revealed 30 HSP70 gene contigs in stony coral Pocillopora damicornis. One crucial HSP70 (PdHSP70) was observed, whose expressions were induced by both elevated temperature and ammonium after expression difference analysis. The complete complementary DNA (cDNA) sequence of PdHSP70 was identified, which encoded a polypeptide of 650 amino acids with a molecular weight of 71.93 kDa. The deduced amino acid sequence of PdHSP70 contained a HSP70 domain (from Pro8 to Gly616), and it shared the highest similarity (95%) with HSP70 from Stylophora pistillata. The expression level of PdHSP70 gene increased significantly at 12 h, and returned to the initial level at 24 h after the stress of high temperature (32 °C). The cDNA fragment encoding the mature peptide of PdHSP70 was recombined and expressed in the prokaryotic expression system. The ATPase activity of recombinant PdHSP70 protein was determined, and it did not change significantly in a wide range of temperature from 25 to 40 °C. These results collectively suggested that PdHSP70 was a vital heat shock protein 70 in the stony coral P. damicornis, whose mRNA expression could be induced by diverse environmental stress and whose activity could remain stable under heat stress. PdHSP70 might be involved in the regulation of the bleaching owing to heat stress in the stony coral P. damicornis.
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Affiliation(s)
- Yidan Zhang
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, Hainan, 570228, China
| | - Zhi Zhou
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, Hainan, 570228, China.
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan, 570228, China.
- Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, College of Marine Science, Hainan University, Haikou, Hainan, 570228, China.
| | - Lingui Wang
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, Hainan, 570228, China
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan, 570228, China
- Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, College of Marine Science, Hainan University, Haikou, Hainan, 570228, China
| | - Bo Huang
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, Hainan, 570228, China
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan, 570228, China
- Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, College of Marine Science, Hainan University, Haikou, Hainan, 570228, China
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42
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Thomas L, Palumbi SR. The genomics of recovery from coral bleaching. Proc Biol Sci 2018; 284:rspb.2017.1790. [PMID: 29070726 DOI: 10.1098/rspb.2017.1790] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 09/22/2017] [Indexed: 12/12/2022] Open
Abstract
Ecological damage from periodic environmental extremes is often repaired in resilient ecosystems, but the rate of return to a non-damaged state is critical. Measures of recovery of communities include biomass, productivity and diversity, while measures of recovery of individuals tend to focus on physiological conditions and the return to normal metabolic functioning. Transcriptomics offers a window into the entire physiology of the organism under stress and can represent a holistic view of organismal recovery. In this study, we track the recovery of seven colonies of Acropora hyacinthus following a natural bleaching event. We identified a large environmental stress response in the field that involved approximately 20% of the host transcriptome. The transcriptome remained largely perturbed for at least six months after temperatures had cooled and four months after symbiont populations had recovered. Moreover, a small set of genes did not recover to previous expression levels even 12 months after the event, about the time that normal growth rates resumed. This study is among the first to incorporate transcriptomics into a longitudinal dataset of recovery from environmental stress. The data demonstrate large and lasting effects on coral physiology long after environmental conditions return to normal and symbiont populations recover.
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Affiliation(s)
- Luke Thomas
- Department of Biology, Hopkins Marine Station, Stanford University, Pacific Grove, CA 93950, USA
| | - Stephen R Palumbi
- Department of Biology, Hopkins Marine Station, Stanford University, Pacific Grove, CA 93950, USA
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43
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Guzman C, Shinzato C, Lu TM, Conaco C. Transcriptome analysis of the reef-building octocoral, Heliopora coerulea. Sci Rep 2018; 8:8397. [PMID: 29849113 PMCID: PMC5976621 DOI: 10.1038/s41598-018-26718-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Accepted: 05/09/2018] [Indexed: 01/15/2023] Open
Abstract
The blue coral, Heliopora coerulea, is a reef-building octocoral that prefers shallow water and exhibits optimal growth at a temperature close to that which causes bleaching in scleractinian corals. To better understand the molecular mechanisms underlying its biology and ecology, we generated a reference transcriptome for H. coerulea using next-generation sequencing. Metatranscriptome assembly yielded 90,817 sequences of which 71% (64,610) could be annotated by comparison to public databases. The assembly included transcript sequences from both the coral host and its symbionts, which are related to the thermotolerant C3-Gulf ITS2 type Symbiodinium. Analysis of the blue coral transcriptome revealed enrichment of genes involved in stress response, including heat-shock proteins and antioxidants, as well as genes participating in signal transduction and stimulus response. Furthermore, the blue coral possesses homologs of biomineralization genes found in other corals and may use a biomineralization strategy similar to that of scleractinians to build its massive aragonite skeleton. These findings thus offer insights into the ecology of H. coerulea and suggest gene networks that may govern its interactions with its environment.
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Affiliation(s)
- Christine Guzman
- Marine Science Institute, College of Science, University of the Philippines, Diliman, Quezon City, 1101, Philippines.,Evolutionary Neurobiology Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa, 904-0495, Japan
| | - Chuya Shinzato
- Department of Marine Bioscience, Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa-shi, Chiba, 277-8564, Japan
| | - Tsai-Ming Lu
- Marine Genomics Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa, 904-0495, Japan
| | - Cecilia Conaco
- Marine Science Institute, College of Science, University of the Philippines, Diliman, Quezon City, 1101, Philippines.
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44
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45
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Mayfield AB, Chen YJ, Lu CY, Chen CS. The proteomic response of the reef coral Pocillopora acuta to experimentally elevated temperatures. PLoS One 2018; 13:e0192001. [PMID: 29385204 PMCID: PMC5792016 DOI: 10.1371/journal.pone.0192001] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 01/15/2018] [Indexed: 12/12/2022] Open
Abstract
Although most reef-building corals live near the upper threshold of their thermotolerance, some scleractinians are resilient to temperature increases. For instance, Pocillopora acuta specimens from an upwelling habitat in Southern Taiwan survived a nine-month experimental exposure to 30°C, a temperature hypothesized to induce stress. To gain a greater understanding of the molecular pathways underlying such high-temperature acclimation, the protein profiles of experimental controls incubated at 27°C were compared to those of conspecific P. acuta specimens exposed to 30°C for two, four, or eight weeks, and differentially concentrated proteins (DCPs) were removed from the gels and sequenced with mass spectrometry. Sixty unique DCPs were uncovered across both eukaryotic compartments of the P. acuta-dinoflagellate (genus Symbiodinium) mutualism, and Symbiodinium were more responsive to high temperature at the protein-level than the coral hosts in which they resided at the two-week sampling time. Furthermore, proteins involved in the stress response were more likely to be documented at different cellular concentrations across temperature treatments in Symbiodinium, whereas the temperature-sensitive host coral proteome featured numerous proteins involved in cytoskeletal structure, immunity, and metabolism. These proteome-scale data suggest that the coral host and its intracellular dinoflagellates have differing strategies for acclimating to elevated temperatures.
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Affiliation(s)
- Anderson B. Mayfield
- Khaled bin Sultan Living Oceans Foundation, Annapolis, MD, United States of America
- Taiwan Coral Research Center, Checheng, Pingtung, Taiwan
- * E-mail:
| | - Yi-Jyun Chen
- Taiwan Coral Research Center, Checheng, Pingtung, Taiwan
| | - Chi-Yu Lu
- Department of Biochemistry, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Center for Research Resources and Development, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chii-Shiarng Chen
- Taiwan Coral Research Center, Checheng, Pingtung, Taiwan
- Department of Marine Biotechnology and Resources, National Sun Yat-Sen University, Kaohsiung, Taiwan
- Graduate Institute of Marine Biotechnology, National Dong-Hwa University, Checheng, Pingtung, Taiwan
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Zhou Z, Yu X, Tang J, Wu Y, Wang L, Huang B. Systemic response of the stony coral Pocillopora damicornis against acute cadmium stress. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2018; 194:132-139. [PMID: 29179148 DOI: 10.1016/j.aquatox.2017.11.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 11/21/2017] [Accepted: 11/22/2017] [Indexed: 06/07/2023]
Abstract
Heavy metals have become one of the main pollutants in the marine environment and a major threat to the growth and reproduction of stony corals. In the present study, the density of symbiotic zooxanthellae, levels of crucial physiological activities and the transcriptome were investigated in the stony coral Pocillopora damicornis after the acute exposure to elevated cadmium concentration. The density of symbiotic zooxanthellae decreased significantly during 12-24h period, and reached lowest at 24h after acute cadmium stress. No significant changes were observed in the activity of glutathione S-transferase during the entire stress exposure. The activities of superoxide dismutase and catalase, and the concentration of glutathione decreased significantly, but the activation level of caspase3 increased significantly after cadmium exposure. Furthermore, transcriptome sequencing and bioinformatics analysis revealed 3538 significantly upregulated genes and 8048 significantly downregulated genes at 12h after the treatment. There were 12 overrepresented GO terms for significantly upregulated genes, mostly related to unfolded protein response, endoplasmic reticulum stress and apoptosis. In addition, a total of 32 GO terms were overrepresented for significantly downregulated genes, and mainly correlated with macromolecular metabolic processes. These results collectively suggest that acute cadmium stress could induce apoptosis by repressing the production of the antioxidants, elevating oxidative stress and activating the unfolded protein response. This cascade of reactions would result to the collapse of the coral-zooxanthella symbiosis and the expulsion of symbiotic zooxanthellae in the stony coral P. damicornis, ultimately leading to coral bleaching.
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Affiliation(s)
- Zhi Zhou
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, Hainan, 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China; Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, College of Marine Science, Hainan University, Haikou, Hainan 570228, China.
| | - Xiaopeng Yu
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, Hainan, 570228, China
| | - Jia Tang
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, Hainan, 570228, China
| | - Yibo Wu
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, Hainan, 570228, China
| | - Lingui Wang
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, Hainan, 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China; Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, College of Marine Science, Hainan University, Haikou, Hainan 570228, China
| | - Bo Huang
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, Hainan, 570228, China; Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, College of Marine Science, Hainan University, Haikou, Hainan 570228, China
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Traylor-Knowles N, Rose NH, Sheets EA, Palumbi SR. Early Transcriptional Responses during Heat Stress in the Coral Acropora hyacinthus. THE BIOLOGICAL BULLETIN 2017; 232:91-100. [PMID: 28654330 DOI: 10.1086/692717] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Corals respond to heat pulses that cause bleaching with massive transcriptional change, but the immediate responses to stress that lead up to these shifts have never been detailed. Understanding these early signals could be important for identifying the regulatory mechanisms responsible for bleaching and how these mechanisms vary between more and less resilient corals. Using RNA sequencing (RNAseq) and sampling every 30 minutes during a short-term heat shock, we found that components of the transcriptome were significantly upregulated within 90 min and after a temperature increase of +2 °C. The developmental transcription factor, Krüppel-like factor 7, was highly expressed within 60 min, and stress-related transcription factors such as Elk-3 were highly expressed starting at 240 min. The sets of genes enriched for early transcriptional response to heat stress included heat shock proteins, small GTPases, and proteasome genes. Retrovirus-related Pol polyproteins from transposons were significantly expressed throughout the whole experiment. Lastly, we propose a model for early transcriptional regulation of protein degradation and cell adhesion response that may ultimately lead to the bleaching and stress response.
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