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Precambrian origins of the TNFR superfamily

Abstract

The evolution of the tumor necrosis factor/tumor necrosis factor receptor superfamily (TNF/TNFR) is complicated and not well understood. To date, most TNFR studies have focused on vertebrate models leaving the role of TNFRs in invertebrates largely unexplored. The evolution of important cellular processes including stress response, apoptosis, development, and inflammation will be better understood by examining the TNF/TNFR superfamily in ancient invertebrate phyla. How widespread is this gene family within the evolutionary tree of life and is there evidence for similar function in invertebrates? A first step is to identify the presence or absence of these genes within basal metazoan taxa using the signature cysteine-rich domain (CRD) of the TNFR superfamily. In this perspective, we will start by examining what is currently known about the function of TNFRs in invertebrates. Then, we will assess the role of TNFRs in apoptosis and explore the origins of the domains found in TNFRs including the death domain (DD) and CRD. Finally, we will examine the phylogenetic relationship between TNFRs containing DDs identified to date. From these data, we propose a model for a Precambrian origin of TNFRs and their functional role in apoptosis.

Facts

  • The TNFR superfamily is remarkably diverse across animal phyla.

  • The role of TNFRs in apoptosis is ancient.

  • The cysteine-rich domain (CRD) of TNFRs is present across all domains of life.

Open questions

  • Why is the TNFR repertoire of choanoflagelletes so diverse?

  • What is of the functional role of invertebrate TNFRs that lack death domains?

  • When did the TNF-ligand and its role in apoptosis emerge?

  • What are the ligands of invertebrate TNFRs?

A Brief History of TNF/TNFR Research

Although the focus of this study will be on the function and origin of invertebrate TNFRs, a brief history of the TNF/TNFR superfamily is required to place these studies in proper context. The path towards discovery can be traced back to the late nineteenth century when the regression of human tumors was observed following bacterial infection.1 These results led to the treatment of human cancers using bacterial extracts termed ‘Coley’s toxins’, named after the oncologist W. Coley.2 More than 50 years later, lipopolysaccharide was isolated from these extracts and shown to induce tumor regression; however, it was determined that it was a factor in the serum, termed tumor-necrotizing factor that actually caused the tumor regression. The cellular receptors for TNF were first described in 1984 leading to the discovery of a novel protein domain termed death domain (DD) that was located on the intracellular portion of TNFRs and was responsible for initiating programmed cell death (apoptosis).35 These ‘Death Receptors’ were shown to be central regulators of apoptosis serving as both internal and external sensors that maintain organismal integrity.5 In humans, a total of 19 different TNF ligands and 29 TNFRs have been described to date.6 In addition to apoptosis, the TNF/TNFR superfamily is involved in cellular differentiation and proliferation through the activation of a variety of signaling pathways. For a more detailed description of these pathways and the many cellular processes that the TNF/TNFR superfamily is involved in, the authors point the reader to the review by Gaur and Aggarwal.7 TNFRs have also been extensively studied in other vertebrate model systems such as zebrafish8 and mice,9 however the focus of this study will be exclusively on invertebrate TNFRs.

Chordata

The phyla Chordata is defined by the presence of a notochord during development and includes both invertebrate and vertebrate species. Invertebrate members of the phyla chordata (e.g., tunicates, hagfish, and cephalochordates) are considered to be the most closely related to humans, and have been the focus of many studies on diversity of the innate immune system and its divergence from the adaptive immune system.10 For example, in the tunicates, Ciona savignyi and Ciona intestinalis, TNF-α was upregulated in hemocytes in response to a lipopolysaccharide challenge and was primarily expressed in inflammatory granulocytes that occurred at the area of inflammation.11 The lancelet fish, Amphioxus, has an extensive repertoire of TNF/TNFRs present in its genome.12 In response to an lipopolysaccharide immune challenge, moderate upregulation of TNF and TNFR occurred and it was a dynamic response depending on the homolog. From these data, it was concluded that TNF and TNFR could be important in the immune response to mucosal pathogens in Amphioxus.13 Overall, the TNFR superfamily has been demonstrated to have a dynamic role in immune function and is activated in response to immune challenges from lipopolysaccharide in multiple chordate species.1113

Mollusca

Members of the TNF/TNFR superfamily have been widely described in the phylum Mollusca (e.g., oysters, mussels, and clams) and most of the evidence points to its role in the immune response to Gram-negative bacteria. For example, the first TNF-α homolog was characterized in Disk Abalone (Haliotis discus discus) and was constitutively expressed in infected and non-infected tissues. However, it was significantly upregulated in the gills that were exposed to multiple pathogens.14

In the Pacific Oyster (Crassostrea gigas), TNFRs has an important role in biotic and abiotic stress response, specifically six of the Pacific Oyster TNFRs were differentially expressed in response to bacteria exposure.15 In addition, many of the Pacific Oyster TNF ligands exhibit a dynamic gene expression response pattern, where more than half of the TNFs are responsive to biotic challenges. Pacific Oysters infected with Vibrio sp. also had several different TNFs that responded differently; four TNFs are late responders, three are repressed, and one is a very early responder.15 Although the complete picture of the mechanisms controlling this TNF expression is not completely understood, it is apparent that the expression is sensitive to timing during an infection, and is dynamic in what does and does not respond.

In the Flat Oyster (Ostrea edulis), TNF expression was upregulated in hemolymph cells during a Bonamiosis infection.16 This upregulation appears to be correlated with the severity of the infection, and again presents the nature of TNF/TNFR expression as dynamic.16 Finally, in the scallop (Chlamys farreri), TNFR was upregulated in the gill tissues and mantle in response to a Listonella anguillarum challenge.17

Overall, the TNF/TNFR system in mollusks is important in the host response to bacterial infection. The TNF/TNFR system responds to challenges with different Gram-negative bacteria, and appears to have a dynamic nature, which changes depending on severity, timing, and tissue that is infected.1417

Arthropoda

Information on the role of the TNF/TNFR signaling system in arthropods is limited to the fruit fly (Drosophila melanogastor), which has a TNF homolog named Eiger and a TNFR homolog called Wegen.18 Although there only appears to be one TNF and one TNFR in Drosophila, the work to date has been the most extensive on any invertebrate. The role of the Eiger/Wegen system in immunity is very intricate, where tolerance phenotypes for intracellular Gram-positive bacteria have been observed, and faster death is observed in Eiger mutants exposed to extracellular microbes.19 In addition, Eiger mutants in Drosophila appear to affect many components of the immune system including melanization, Imd signaling, and the response to genotoxic stress.20 Finally, Eiger signaling has other important functions in the sensory system of Drosophila such as its involvement in the sensitization of nociceptive sensory neurons during thermal allodynia and UV exposure.21

Similar to Mollusca, the TNF/TNFR in Drosophila and presumably in other arthropods is involved in response to pathogens, but has a very complicated response. In addition, the role of TNFR in the neurosensory system of Drosophila adds in another layer of complexity to the function of this gene family.

Cnidaria

Cnidarians, which include corals, sea anemones, jellyfish, and hydrozoans, were previously thought to be ‘simple’ organisms that would also possess correspondingly simple immune systems. However, recent evidence has demonstrated that despite their morphological simplicity, the innate immune system of cnidarians is complicated and diverse.2224 This complexity and diversity is particularly apparent in the TNF/TNFR superfamily.25

In corals, the activation of the TNF/TNFR system has been demonstrated in response to heat stress.26,27 In the coral Acropora hyacinthus, heat-tolerant colonies express different TNFRs compared with heat-sensitive corals suggesting they may be important in the adaptation of corals to future climate change.27 In Hydra, a TNFR protein was expressed at the tips of the wound site suggesting it could be involved in signal transduction during wound healing.28 To date, no publications examining the role of the TNF/TNFR superfamily in response to pathogenic insult have been reported in Cnidarians, however, the conserved role of TNFRs in the bacterial immune response observed in Arthropods, Mollusks, and Chordates suggests that TNFRs may also be involved in Cnidarian immunity.

TNFRs and Apoptosis

Whereas most invertebrate TNFR studies have focused on the role of TNFRs in physiological stress and immunity, recent work demonstrated the TNF-apoptotic response is evolutionarily conserved in the coral species Acropora yongei. A recombinant human TNF-α was shown to bind to coral cells in culture, increase caspase activity, and finally cause cell death. The reciprocal experiment, exposure of a purified coral TNF to human cells, also induced cell death through a TNFR signaling pathway suggesting over 550 million of evolutionary conservation between humans and corals.25 Whereas it has been demonstrated that TNF-induced apoptosis is conserved in corals, additional proteins involved in the apoptotic cascade are also present.29,30 Functional studies have demonstrated that the Caspase-8 of A. millepora also displays the same substrate specificity as human Caspase-8 and interacts directly with FADD. In addition, the expression of coral Bcl-2 family members in mammalian cells demonstrated functional conservation of the anti-apoptotic/effector responses.31 Although direct experimentation with Cnidarian apoptotic proteins is still in its infancy, multiple lines of evidence suggest the machinery of TNFR-mediated apoptosis was present in the last common metazoan ancestor.30 To better understand the observed conservation of TNFR-mediated apoptosis in corals, it is necessary to investigate the domains of the TNFR protein itself, which domains link a specific TNFR to the apoptotic response, and where these domains are found throughout the tree of life.

The functional domains of TNFRs

Despite remarkably low sequence similarity, all members of the TNFR superfamily possess at least one extracellular cysteine-rich domain (CRD) consisting of six cysteines that form three disulfide bridges.32 The intracellular portion of individual TNFRs is variable and can be attributed to the variety of biological activities they are involved in including immune modulation, inflammation, and cell differentiation.33 However, TNFRs that are involved in programmed cell death or apoptosis share an intracellular DD that activates the apoptotic cascade.34

Origins of CRDs, DDs, and TNFRs

The CRD has deep evolutionary origins and can be found within the predicted proteomes of Cnidarians,29,35,36 Choanoflagellates,37 sponges,38 Ctenophores,39,40 bacteria (PRJNA177747), and plants41 (Supplementary Table S1). To date, the Choanoflagelletes (Monosiga brevicollis and Salpingoeca rosetta) have the highest number of CRD-containing proteins with 44 and 84, respectively (Table 1). However, none of these CRD-containing proteins or any CRD protein found within the repertoires of other Choanoflagelletes, sponges, Ctenenophores, bacteria, or plants also possess a DD suggesting these TNFRs are not involved in apoptosis (see Supplementary Table S1 for full domain analysis). On the basis of the phylogenetic distribution of DD proteins, the domain was likely present in the last common metazoan ancestor. An independent BLAST search for TNFR-associated DDs identified positive matches within the genomes of Ctenophores, sponges, and Placozoans,42 however, none of these proteins also possessed a CRD (Figure 1 and Supplementary Table S2). Taken together, we propose that the CRD emerged in the last common eukaryotic ancestor followed by a fusion event with a DD during the last common metazoan ancestor resulting in the first TNFR involved in apoptosis (Figure 2). Alternatively, the CRD and DD could have independently fused into a single protein in multiple lineages. We conclude that the former hypothesis, a single fusion event as the most parsimonious explanation of the evolutionary conservation of TNF-induced apoptosis.25

Table 1 Summary of TNFRs across phyla
Figure 1
figure1

Evolution of TNFR domains across phyla. (a) TNFRs possess an extracellular CRD involved in ligand binding and an intracellular DD for the initiation of apoptosis. (b) The CRD across animal phyla and domains of life. The CRD of TNFRs is approximately 40 amino acids in length and contains three conserved disulfide bridges between C1-C2, C3-C5, and C4-C6.

Figure 2
figure2

Hypothesis for the origin of TNFRs. The CRD existed in the last common eukaryotic ancestor (LECA) while the TNFR-specific DD emerged before the last common metazoan ancestor (LCMA). Following a fusion event between a CRD and DD, the primordial TNFR involved in apoptosis was formed.

Discussion of phylogenetic tree

To infer phylogenetic relationships between DD containing TNFRs neighbor-joining analysis was preformed on 62 amino acid sequences of the TNFR protein of representative vertebrates and invertebrates (Figure 3). Our neighbor-joining tree confirms that the sequence diversity previously found in vertebrate TNFRs is also present in invertebrates.43,44 Invertebrate TNFRs containing DDs have incredible variation, both within taxa and throughout the evolutionary tree. In our neighbor-joining analysis, we identified six clusters of TNFRs. The A. digitifera proteins are present within three groups (Group 1, Group 5, and Group 6). Within Group 1, A. digitifera proteins 06604Acd, 02522Acd, and 06605Acd are clustered together with mammalian TNFR1A. Although this TNFR is involved in apoptosis, its main function is in the regulation of pro-inflammatory signaling pathways.45 In Group 5, 7 of the 13 coral TNFRs cluster with the TNFR EDAR proteins. These proteins have previously been shown to be important for epidermal morphogenesis.46 Further testing would need to be done in corals to understand whether this is occurring, but it is possible that this role in morphogenesis could be a very primitive role for this extensive gene family.

Figure 3
figure3

Evolutionary relationships of taxa with DD-containing TNFRs. The evolutionary history was inferred using the neighbor-Joining method.44 The optimal tree with the sum of branch length=30.30949398 is shown. The percentage of replicate trees in which the associated taxa clustered together in the bootstrap test (1000 replicates) are shown above the branches.52 The tree is drawn to scale, with branch lengths in the same units as those of the evolutionary distances used to infer the phylogenetic tree. The evolutionary distances were computed using the Poisson correction method53 and are in the units of the number of amino acid substitutions per site. The analysis involved 62 amino acid sequences. All positions containing gaps and missing data were eliminated. There were a total of 102 positions in the final dataset. Evolutionary analyses were conducted in MEGA7.54,55 Abbreviations of taxa include: Homo sapiens (Hos), Mus musculus (Mum), Danio rerio (Dar), Xenopus laevis (Xel), Branchiostoma floridae (Brf), Strongylocentrotus purpuratus (Stp), Crassostrea gigas (Crg), Chlamys farreri (Chf), Nematostella vectensis (Nev), and Acropora digitifera (Acd) with a black circle next to taxon name. For full description of sequences, see Supplementary Table 1.

Taken together, the DD-associated TNFRs from corals cluster into groups that contain TNFR members functioning in inflammation, morphogenesis, and apoptosis. The inflammation response of TNFRs has been widely studied in other invertebrates, but warrants more study in basal invertebrates (including corals, sponges, ctenophores, and so on). Although not yet functionally confirmed, this same function could exist in corals, and could therefore represent the most ancestral function of DD TNFRs. This would expand the functional repertoire of ancestral DD TNFRs to include not only apoptosis, but also inflammation and morphogenesis.

Future Work

To investigate these hypotheses, the DD-binding partners of TNFRs should be determined. If a single fusion event occurred in the basal metazoan ancestor resulting in the fixation of TNFR-induced apoptosis, we would expect similar proteins to associate with the DD across phyla. In corals, a key unknown is the localization of specific TNFRs within coral tissue. Characterizing which cell types express TNFRs containing DDs will provide insight into what the ancestral state of TNFR-mediated apoptosis may have been. Whereas corals currently lack robust molecular tools for mechanistic investigations, two fellow Cnidarian model systems, Nematostella vectensis (sea anemone) and Hydra magnipapillata, have well-developed methods to investigate protein function.47,48 Apoptosis in general has been examined in N. vectensis49,50 and H. magnipapillata,51 but TNFRs have yet to be directly investigated. An integrative approach that involves multiple Cnidarian species combined with additional basal metazoan phyla is required to better understand the origin of evolution of TNFR-mediated apoptosis. Finally, although this review has shown that the function of apoptosis is likely a very old, there are other possible functional avenues to explore, including a role in inflammation and morphogenesis.

Abbreviations

TNF:

tumor necrosis factor

TNFR:

tumor necrosis factor receptor

CRD:

cysteine-rich domain

DD:

death domain

LPS:

lipopolysaccharide

References

  1. 1

    Bruns P . Die heilwirkung des erysipels auf geschwulste beitr. Klin Chir 1868; 3: 443–446.

    Google Scholar 

  2. 2

    McCarthy EF . The toxins of William B. Coley and the treatment of bone and soft-tissue sarcomas. Iowa Orthop J 2006; 26: 154–158.

    PubMed  PubMed Central  Google Scholar 

  3. 3

    Itoh N, Nagata S . A novel protein domain required for apoptosis. Mutational analysis of human Fas antigen. J Biol Chem 1993; 268: 10932–10937.

    CAS  PubMed  Google Scholar 

  4. 4

    Tartaglia LA, Ayres TM, Wong GHW, Goeddel DV . A novel domain within the 55 kd TNF receptor signals cell death. Cell 1993; 74: 845–853.

    CAS  Article  Google Scholar 

  5. 5

    Ashkenazi A, Dixit VM . Death receptors: signaling and modulation. Science 1998; 281: 1305–1308.

    CAS  Article  Google Scholar 

  6. 6

    Wiens GD, Glenney GW . Origin and evolution of TNF and TNF receptor superfamilies. Dev Comp Immunol 2011; 35: 1324–1335.

    CAS  Article  Google Scholar 

  7. 7

    Gaur U, Aggarwal BB . Regulation of proliferation, survival and apoptosis by members of the TNF superfamily. Biochem Pharmacol 2003; 66: 1403–1408.

    CAS  Article  Google Scholar 

  8. 8

    Eimon PM, Kratz E, Varfolomeev E, Hymowitz SG, Stern H, Zha J et al. Delineation of the cell-extrinsic apoptosis pathway in the zebrafish. Cell Death Differ 2006; 13: 1619–1630.

    CAS  Article  Google Scholar 

  9. 9

    Ashkenazi A, Dixit VM . Apoptosis control by death and decoy receptors. Curr Opin Cell Biol 1999; 11: 255–260.

    CAS  Article  Google Scholar 

  10. 10

    Litman GW, Rast JP, Fugmann SD . The origins of vertebrate adaptive immunity. Nat Rev Immunol 2010; 10: 543–553.

    CAS  Article  Google Scholar 

  11. 11

    Parrinello N, Vizzini A, Arizza V, Salerno G . Enhanced expression of a cloned and sequenced Ciona intestinalis TNFα-like (CiTNFα) gene during the LPS-induced inflammatory response. Cell tissue 2008; 334: 305–317.

    CAS  Article  Google Scholar 

  12. 12

    Huang S, Yuan S, Guo L, Yu Y, Li J, Wu T et al. Genomic analysis of the immune gene repertoire of amphioxus reveals extraordinary innate complexity and diversity. Genome 2008; 18: 1112–1126.

    CAS  Article  Google Scholar 

  13. 13

    Huang S, Wang X, Yan Q, Guo L, Yuan S, Huang G et al. The evolution and regulation of the mucosal immune complexity in the basal chordate amphioxus. J Immunol 2011; 186: 2042–2055.

    CAS  Article  Google Scholar 

  14. 14

    De Zoysa M, Jung S, Lee J . First molluscan TNF-? homologue of the TNF superfamily in disk abalone: Molecular characterization and expression analysis. Fish Shellfish Immunol 2009; 26: 625–631.

    CAS  Article  Google Scholar 

  15. 15

    Zhang L, Li L, Guo X, Litman GW, Dishaw LJ, Zhang G . Massive expansion and functional divergence of innate immune genes in a protostome. Sci Rep 2015; 5: 8693.

    CAS  Article  Google Scholar 

  16. 16

    Martín-Gómez L, Villalba A, Abollo E . Identification and expression of immune genes in the flat oyster Ostrea edulis in response to bonamiosis. Gene 2012; 492: 81–93.

    Article  Google Scholar 

  17. 17

    Li L, Qiu L, Song L, Song X, Zhao J, Wang L . First molluscan TNFR homologue in Zhikong scallop: molecular characterization and expression analysis. Fish Shellfish 2009; 27: 625–632.

    CAS  Article  Google Scholar 

  18. 18

    Kauppila S, Maaty W, Chen P, Tomar R, Eby M . Eiger and its receptor, Wengen, comprise a TNF-like system in Drosophila. Oncogene 2003; 22: 4860–4867.

    CAS  Article  Google Scholar 

  19. 19

    Schneider DS, Ayres JS, Brandt SM, Costa A, Dionne MS, Gordon MD et al. Drosophila eiger mutants are sensitive to extracellular pathogens. PLoS Pathog 2007; 3: e41.

    Article  Google Scholar 

  20. 20

    Dionne MS, Schneider DS . Models of infectious diseases in the fruit fly Drosophila melanogaster. Dis Model Mech 2008; 1: 43–49.

    Article  Google Scholar 

  21. 21

    Babcock DT, Landry C, Galko MJ . Cytokine signaling mediates UV-induced nociceptive sensitization in Drosophila larvae. Curr Biol 2009; 19: 799–806.

    CAS  Article  Google Scholar 

  22. 22

    Palmer CV, Traylor-Knowles N . Towards an integrated network of coral immune mechanisms. Proc Biol Sci 2012; 279: 4106–4114.

    CAS  Article  Google Scholar 

  23. 23

    Bosch TCG . The path less explored: innate immune reactions in Cnidarians. In: Heine H (ed), Innate Immunity of Plants, Animals, and Humans. Springer: Berlin Heidelberg, 2008, pp 27–42.

    Google Scholar 

  24. 24

    Loker ES, Adema CM, Zhang S-M, Kepler TB . Invertebrate immune systems not homogeneous, not simple, not well understood. Immunol Rev 2004; 198: 10–24.

    Article  Google Scholar 

  25. 25

    Quistad S, Stotland A, Barott K, Smurthwaite C, Hilton B, Grasis J . Evolution of TNF-induced apoptosis reveals 550 My of functional conservation. Proc Natl Acad Sci USA 2014; 111: 9567–9572.

    CAS  Article  Google Scholar 

  26. 26

    Barshis DJ, Ladner JT, Oliver TA, Seneca FO, Traylor-Knowles N, Palumbi SR . Genomic basis for coral resilience to climate change. Proc Natl Acad Sci USA 2013; 110: 1387–1392.

    CAS  Article  Google Scholar 

  27. 27

    Palumbi SR, Barshis DJ, Traylor-Knowles N, Bay RA . Mechanisms of reef coral resistance to future climate change. Science (80- ) 2014; 344: 895–898.

    CAS  Article  Google Scholar 

  28. 28

    Wenger Y, Buzgariu W, Reiter S, Galliot B . Injury-induced immune responses in Hydra. Semin Immunol 2014; 26: 277–294.

    CAS  Article  Google Scholar 

  29. 29

    Shinzato C, Shoguchi E, Kawashima T, Hamada M, Hisata K, Tanaka M et al. Using the Acropora digitifera genome to understand coral responses to environmental change. Nature 2011; 476: 320–323.

    CAS  Article  Google Scholar 

  30. 30

    Sakamaki K, Imai K, Tomii K, Miller DJ . Evolutionary analyses of caspase-8 and its paralogs: Deep origins of the apoptotic signaling pathways. BioEssays 2015; 37: 767–776.

    CAS  Article  Google Scholar 

  31. 31

    Moya A, Sakamaki K, Mason BM, Huisman L, Forêt S, Weiss Y et al. Functional conservation of the apoptotic machinery from coral to man: the diverse and complex Bcl-2 and caspase repertoires of Acropora millepora. BMC Genomics 2016; 17: 1–20.

    Article  Google Scholar 

  32. 32

    Banner DW, D’Arcy A, Janes W, Gentz R, Schoenfeld HJ, Broger C et al. Crystal structure of the soluble human 55 kd TNF receptor-human TNF?? complex: Implications for TNF receptor activation. Cell 1993; 73: 431–445.

    CAS  Article  Google Scholar 

  33. 33

    Cabal-Hierro L, Lazo PS . Signal transduction by tumor necrosis factor receptors. Cell Signal 2012; 24: 1297–1305.

    CAS  Article  Google Scholar 

  34. 34

    Kim JW, Choi EJ, Joe CO . Activation of death-inducing signaling complex (DISC) by pro-apoptotic C-terminal fragment of RIP. Oncogene 2000; 19: 4491–4499.

    CAS  Article  Google Scholar 

  35. 35

    Putnam NH, Srivastava M, Hellsten U, Dirks B, Chapman J, Salamov A et al. Sea anemone genome reveals ancestral Eumetazoan gene repertoire and genomic organization. Science 2007; 317: 86–94.

    CAS  Article  Google Scholar 

  36. 36

    Chapman JA, Kirkness EF, Simakov O, Hampson SE, Mitros T, Weinmaier T et al. The dynamic genome of Hydra. Nature 2010; 464: 592–596.

    CAS  Article  Google Scholar 

  37. 37

    King N, Westbrook MJ, Young SL, Kuo A, Abedin M, Chapman J et al. The genome of the choanoflagellate Monosiga brevicollis and the origin of metazoans. Nature 2008; 451: 783–788.

    CAS  Article  Google Scholar 

  38. 38

    Srivastava M, Simakov O, Chapman J, Fahey B, Gauthier MEA, Mitros T et al. The Amphimedon queenslandica genome and the evolution of animal complexity. Nature 2010; 466: 720–726.

    CAS  Article  Google Scholar 

  39. 39

    Ryan JF, Pang K, Schnitzler CE, Nguyen A-D, Moreland RT, Simmons DK et al. The genome of the ctenophore Mnemiopsis leidyi and its implications for cell type evolution. Science 2013; 342: 1242592.

    Article  Google Scholar 

  40. 40

    Moroz LL, Kocot KM, Citarella MR, Dosung S, Norekian TP, Povolotskaya IS et al. The ctenophore genome and the evolutionary origins of neural systems. Nature 2014; 510: 109–114.

    CAS  Article  Google Scholar 

  41. 41

    Nikonorova N, Vu LD, Czyzezewicz N, Gevaert K, De Smet I . A phylogenetic approach to study the origin and evolution of the CRINKLY4 family. Front Plant Sci 2015; 6: 880.

    Article  Google Scholar 

  42. 42

    Srivastava M, Begovic E, Chapman J, Putnam NH, Hellsten U, Kawashima T et al. The Trichoplax genome and the nature of placozoans. Nature 2008; 454: 955–960.

    CAS  Article  Google Scholar 

  43. 43

    Collette Y, Gilles A, Pontarotti P, Olive D . A co-evolution perspective of the TNFSF and TNFRSF families in the immune system. Trends Immunol 2003; 24: 387–394.

    CAS  Article  Google Scholar 

  44. 44

    Saitou N, Nei M . The neighbor-joining method: a new method for reconstructing phylogenetic trees. Mol Biol Evol 1987; 4: 406–425.

    CAS  Google Scholar 

  45. 45

    Turner MD, Nedjai B, Hurst T, Pennington DJ . Cytokines and chemokines: At the crossroads of cell signalling and inflammatory disease. Biochim Biophys Acta 2014; 1843: 2563–2582.

    CAS  Article  Google Scholar 

  46. 46

    Yan M, Wang LC, Hymowitz SG, Schilbach S, Lee J, Goddard A et al. Two-amino acid molecular switch in an epithelial morphogen that regulates binding to two distinct receptors. Science 2000; 290: 523–527.

    CAS  Article  Google Scholar 

  47. 47

    Renfer E, Amon-Hassenzahl A, Steinmetz PRH, Technau U . A muscle-specific transgenic reporter line of the sea anemone, Nematostella vectensis. Proc Natl Acad Sci USA 2010; 107: 104–108.

    CAS  Article  Google Scholar 

  48. 48

    Wittlieb J, Khalturin K, Lohmann JU, Anton-Erxleben F, Bosch TCG . Transgenic Hydra allow in vivo tracking of individual stem cells during morphogenesis. Proc Natl Acad Sci USA 2006; 103: 6208–6211.

    CAS  Article  Google Scholar 

  49. 49

    Mire P, Venable S . Programmed cell death during longitudinal fission in a sea anemone. Invert Biol 1999; 118: 319–331.

    Article  Google Scholar 

  50. 50

    Dubuc TQ, Traylor-Knowles N, Martindale MQ . Initiating a regenerative response, cellular and molecular features of wound healing in the cnidarian Nematostella vectensis. BMC Biol 2014; 12: 24.

    Article  Google Scholar 

  51. 51

    David CN, Schmidt N, Schade M, Pauly B, Alexandrova O, Böttger A . Hydra and the evolution of apoptosis. Integr Comp Biol 2005; 45: 631–638.

    CAS  Article  Google Scholar 

  52. 52

    Felsenstein J . Confidence limits on phylogenies: an approach using the bootstrap. Evolution (NY) 1985; 39: 783–791.

    Article  Google Scholar 

  53. 53

    Zuckerkandl E, Pauling L . Evolutionary divergence and convergence in proteins. In: Bryson V, Vogel HJ (eds), Evolving Genes and Proteins. Academic Press: NY, USA, 1965, pp 97–166.

  54. 54

    Tamura K, Dudley J, Nei M, Kumar S . MEGA4: molecular evolutionary genetics analysis (MEGA) software version 4.0. Mol Biol Evol 2007; 24: 1596–1599.

    CAS  Article  Google Scholar 

  55. 55

    Tamura K, Peterson D, Peterson N, Stecher G . MEGA5: molecular evolutionary genetics analysis using maximum likelihood, evolutionary distance, and maximum parsimony methods. Mol Biol 2011; 28: 2731–2739.

    CAS  Article  Google Scholar 

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Quistad, S., Traylor-Knowles, N. Precambrian origins of the TNFR superfamily. Cell Death Discovery 2, 16058 (2016). https://doi.org/10.1038/cddiscovery.2016.58

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