Geodia barretti

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Geodia barretti
Geodia barretti.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Porifera
Class: Demospongiae
Order: Tetractinellida
Family: Geodiidae
Genus: Geodia
Species:
G. barretti
Binomial name
Geodia barretti
Bowerbank, 1858
Synonyms
  • Cydonium barretti
  • Geodia simplicissima

Geodia barretti is a massive deep-sea sponge species found in the boreal waters of the North Atlantic Ocean, [1] and is fairly common on the coasts of Norway and Sweden. It is a dominant species in boreal sponge grounds. [2] [3] Supported by morphology and molecular data, this species is classified in the family Geodiidae. [4]

Contents

Morphology

Source: [1]

External morphology

G. barretti section. The depression (= preoscule) is filled with small oscules. The cortex is conspicuous. Geodia barretti section.JPG
G. barretti section. The depression (= preoscule) is filled with small oscules. The cortex is conspicuous.

Massive sponge, often irregularly lobate, whitish to light yellow color. The inside is light brown. Surface is smooth. Oscules are grouped in more or less shallow depressions (= preoscules) while pores are spread over the whole body. There is a distinct cortex about 0.5 mm thick, it is made of ball-shaped spicules called sterrasters.

Spicules

Megascleres.

  • Oxeas (1000-5000 μm).
  • Dichotriaenes with rhabdomes up to 5000 μm long (more rarely orthotriaenes).
  • Anatriaenes.
  • Meso/protriaenes (rare).

Microscleres.

Sterraster of G. barretti (scanning electron microscope picture). Smaller strongylasters are also visible in the background. Sterraster Geodia barretti.tif
Sterraster of G. barretti (scanning electron microscope picture). Smaller strongylasters are also visible in the background.
  • Microxeas (190-900 μm), sometimes slightly centrotylote.
  • Sterrasters (50-130 μm).
  • Oxyasters I (30-80 μm), microspined branches, only found in some specimens living > 1000 m.
  • Oxyasters II (6-33 μm), microspined branches.
  • Strongylasters (3-11 μm), microspined branches.

Genetics

DNA barcodes

Genomics

One meta-transcriptome was obtained by pyrosequencing from a specimen collected south of Bergen (Norway) in 2007. [6] Double-stranded cDNA was sequenced on a GF FLX sequencer (Roche Applied Sciences/454 Life Sciences, Barnford, CT). rRNA ribo-tags revealed a microsymbiont community, dominated by group SAR202 of Chloroflexota , candidate phylum " Poribacteria ", and Acidobacteriota . The most abundant mRNAs coded for key metabolic enzymes of nitrification from ammonia-oxidizing Archaea as well as candidate genes involved in related processes.

The whole genome of this sponge was first published in 2023; [7] it was sequenced on PacBio and Illumina (HiSeqX) platforms from a specimen collected in 2016 in Kosterhavet National Park, on the Swedish west coast. This nuclear genome assembly is 144 Mbp long (4,535 scaffolds) with a BUSCO completeness of 71.5%, while the mitochondrial genome is 17,996 bp long. [7] Annotation of the nuclear genome found 31,884 protein-coding genes.

Systematics

Etymology

This sponge was named in honor of one of its discoverers, the biologist Lucas Barrett (1837-1862).

Vernacular names

This sponge is called "rutabaga sponge" in Norwegian (kålrabisvamp) and "football sponge" in Swedish (fotbollssvampdjur).

Type material

This sponge was collected by biologists Robert McAndrew and Lucas Barrett in 1855 on the South side of Vikna Island (formerly called Vigten or Vikten Island), North-Trøndelag, Norway, at a depth of 183 meters. It was later described by the British sponge taxonomist James Scott Bowerbank in 1858.

Drawing of the holotype of G. barretti (Bowerbank, 1872a: plate XI). Proceedings of the Zoological Society of London (9467871080).jpg
Drawing of the holotype of G. barretti (Bowerbank, 1872a: plate XI).

The holotype is a dry specimen stored at the Natural History Museum in London with the museum number BNHM 1877.5.21.1399. There are also slides of the holotype: BNHM 1877.5.21.1400 (one slide of surface and one spicule preparation) and BNHM 1877.5.21.1401 (slide of a section).

Phylogenetic relationships

According to morphology and molecular data, this species belongs to the family Geodiidae and to the genus Geodia . [4] It also seems to belong to a clade of Geodia species that all have their oscules in depressions (including Geodia megastrella , Geodia hentscheli ). [8] This Geodia clade was given a PhyloCode name: Depressiogeodia. [4]

Distribution

G. barretti known distribution in the North Atlantic (as of 2015). G barretti distribution map (2015).png
G. barretti known distribution in the North Atlantic (as of 2015).

Biogeography

G. barretti is present throughout the boreal waters of the North Atlantic, [1] where water temperature is usually 3-9 degrees Celsius. This species is present on the Swedish west coast [9] and all along the Norwegian coast and Svalbard. [10]

One single specimen was formally recorded from the Mediterranean Sea, in the 'Canyon des Moines' (south Corsica), at 167 m (water temperature was 13 °C). [1] Deeper specimens (1100-1700 meter depths) were also recorded off the Atlantic coast of Morocco (Ibero-Moroccan Gulf). [1] Several deep specimens were collected on the mid-Atlantic ridge at 1650 m depth. [11]

Bathymetry

It is found from 30 to 2000 meter depths. [1] Most North-East Atlantic records are from the continental margins, between 200 and 500 m. In the North-West Atlantic (Grand Banks, Flemish Cap, Nova Scotia, and Davis Strait), it has been recorded between 410 and 1852 meter depths. Shallow specimens are common along the Norwegian coast, [12] especially in fjords.

Biology

Reproduction

G. barretti is an oviparous species with separated males and females. [13] [14] The reproductive cycle is annual with one or two events of gamete release per year, the major reproductive season being from late spring to early autumn. [14] The larvae has never been observed. Asexual reproduction has never been formally described.

The reproduction molecular toolkit of boreo-arctic Geodia species has been investigated, including in Geodia barretti, using proteomic and trancriptomic data. Genes involved in the formation of the gametes appeared close to the ones found in the rest of the animals. [15]

Predators

The sponge-feeding deep-sea chiton Hanleya nagelfar is often found on G. barretti in the North-East Atlantic. [16] The parasitic foraminiferan Hyrrokkin sarcophaga [17] is more rarely found living on G. barretti.

Associated macrofauna

G. barretti has less associated macrofauna than any of the other boreo-arctic Geodia species: only ten different species of epibionts were recorded vs. 62 for Geodia macandrewii . [18]

Microbiology

G. barretti is a high microbial abundance (HMA) sponge, [19] such that the mesohyl is essentially packed with microbes, and just a few sponge cells. It was calculated that the sponge itself (canals, choanocyte chambers and cells) represents only 5% of its total volume, the rest being microbes. [20]

Estimates of the number of bacteria in G. barretti are between 2.9x1011 [19] and 3.1x1011 [20] microbes/cm3 sponge.

Isolation and study of specific bacteria

Streptomyces sp. GBA 94-10, an Actinomycetota, was isolated from a Norwegian G. barretti. [21] It was shown to be a close relative of the terrestrial Streptomyces albus J1074. The genome was fully sequenced (Genbank accession numbers CM002271- plasmid pGBA1 CM002272).

Streptomyces poriferorum (type strain P01-B04T), an Actinomycetota, was isolated and described in two Norwegian sponges ( Antho dichotoma and G. barretti). [22] This bacteria might provide their host with chemical defenses and might be involved in nitrogen metabolism. The whole genome was sequenced (Genbank accession number JAELVH010000000); the 16S rRNA gene sequence can also be found on Genbank (MW583039).

Actinoalloteichus fjordicus, an Actinomycetota, was isolated and described in two Norwegian sponges ( Antho dichotoma and G. barretti). [23] This Actinomycetota genus has been found in terrestrial and marine habitats. This bacterium's genome was fully sequenced (Genbank accession numbers CP016077-plasmid CP016078).

Microbiomes

Chemistry

The major compound of G. barretti, called barettin, was isolated in 1986 at Uppsala University, Sweden; barettin has antifouling activity. Since then, two more barettins were discovered, as well as other small molecules (see Table below). Peptides called barrettides were found and published in 2015. [24] Using metabolomics on specimens of G. barretti from Sweden, most of these compounds could be found, in addition to nucleotides, nucleosides and nucleobases, as well as some fatty acids. [25]

Compounds isolated from Geodia barretti
CompoundType of compoundDiscovered/described byBiactivitiesStructure
barettin diketopiperazine (monobrominated)Lidgren, Bohlin and Bergman (1986) [26]
  • antifouling [27]
  • selective 5-HT ligands [28]
  • antioxidant [29]
  • anti-inflammatory [29] [30]
  • Inhibitor of electric eel acetylcholinesterase [31]
  • NOT antitumoral [29]
m/z 419,0826 [M+H] Barettin.svg
m/z 419,0826 [M+H]
8,9-dihydrobarettin diketopiperazine (monobrominated)Sjögren, Göransson, Johnson, Dahlström, Andersson, Bergman, Jonsson and Bohlin (2004) [27]
  • antifouling [27]
  • selective 5-HT ligands [28]
  • inhibitor of electric eel acetylcholinesterase [31]
m/z 421,0982 [M+H] 8,9-dihydrobarettin.png
m/z 421,0982 [M+H]
bromobenzisoxalone barettin diketopiperazine (dibrominated)Hedner, Sjögren, Fröndberg, Johansson, Göransson, Dahlström, Jonsson, Nyberg and Bohlin (2006) [28] antifouling [28]
m/z 648,0200 [M+H] Bromobenzisoxazolone barettin.png
m/z 648,0200 [M+H]
geobarettin A diketopiperazine (monobrominated)Di, Rouger, Hardardottir, Freysdottir, Molinski, Tasdemir and Omarsdottir (2018) [32] NO anti-inflammatory activity [32]
m/z 451.0728 [M+H] Geobarettin A.png
m/z 451.0728 [M+H]
geobarettin B diketopiperazine (monobrominated)Di, Rouger, Hardardottir, Freysdottir, Molinski, Tasdemir and Omarsdottir (2018) [32] anti-inflammatory activity [32]
m/z 417.0675 [M+H] Geobarettin B.png
m/z 417.0675 [M+H]
geobarettin C indole (monobrominated)Di, Rouger, Hardardottir, Freysdottir, Molinski, Tasdemir and Omarsdottir (2018) [32] anti-inflammatory activity [32]
m/z 295.0440 [M] Geobarettin C.png
m/z 295.0440 [M]
L-6-bromohypaphorine indole (monobrominated)Di, Rouger, Hardardottir, Freysdottir, Molinski, Tasdemir and Omarsdottir (2018) [32] Agonist of Human α7 Nicotinic Acetylcholine Receptor [33]
m/z 325.0550 [M+H] L-6-bromohypaphorine.png
m/z 325.0550 [M+H]
6-bromoconicamin indole (monobrominated)Olsen, Hansen, Moodie, Isaksson, Sepcic, Cergolj, Svenson and Andersen (2016) [31] inhibitor of electric eel acetylcholinesterase [31]
m/z 279.0491 [M] 6-bromoconicamin.png
m/z 279.0491 [M]
8-hydroxy-6-bromoconicamin indole

(monobrominated)

Olsen, Hansen, Moodie, Isaksson, Sepcic, Cergolj, Svenson and Andersen (2016) [31] NO inhibition of electric eel acetylcholinesterase [31]
m/z 297.0586 [M] Hydroxylated 6-bromoconicamin.png
m/z 297.0586 [M]
3-methylcytidine,

3-methyl-2’-deoxycytidine, 3-methyl-2’-deoxyuridine

 nucleoside Lidgren, Bohlin, and Christophersen (1988) [34] contractile activity

(3-mCyd, 3-mdCyd) [34]

3-Methylcytidine v2.svg
histamine histidine derivativeLidgren, Bohlin, and Christophersen (1988) [34] contractile activity [34]
m/z 112.0869 [M+H] Histamine.svg
m/z 112.0869 [M+H]
barrettides A-B peptides Carstens, Rosengren, Gunasekera, Schempp, Bohlin, Dahlström, Clark and Göransson (2015) [35] antifouling [35]

NOT antibacterial [35]

2-O-acetyl-1-O-hexadecylglycero-3-phosphocholine phosphocholine Olsen, Søderholm, Isaksson, Andersen and Hansen (2016) [36] antitumoral [36]
glycine betain

β-alanine betain

ɣ-aminobutyric acid betain

tetramethylammonium ion

quaternary ammonium compoundsHougaard, Anthoni, Christophersen, Larsen and Nielsen (1991) [37]

Erngren, Smit, Pettersson, Cárdenas, Hedeland (2021) [25]

sterols Hougaard, Christophersen, Nielsen, Klitgaard, and Tendal (1991) [38]
fatty acids Thiel, Blumenberg, Hefter, Pape, Pomponi, Reed, Reitner,

Wörheide and Michaelis (2002) [39]

de Kluijver, Nierop, Morganti, Bart, Slaby, Hanz, de Goeij, Mienis, Middelburg (2021) [40]

free amino acids Hougaard, Christophersen, Nielsen, Klitgaard, and Tendal (1991) [38]

Conservation

References

  1. 1 2 3 4 5 6 Cárdenas, Paco; Rapp, Hans Tore; Klitgaard, Anne Birgitte; Best, Megan; Thollesson, Mikael; Tendal, Ole Secher (2013-10-01). "Taxonomy, biogeography and DNA barcodes of Geodia species (Porifera, Demospongiae, Tetractinellida) in the Atlantic boreo-arctic region". Zoological Journal of the Linnean Society. 169 (2): 251–311. doi: 10.1111/zoj.12056 . ISSN   1096-3642.
  2. ↑ Klitgaard, A. B.; Tendal, O. S. (2004-04-01). "Distribution and species composition of mass occurrences of large-sized sponges in the northeast Atlantic". Progress in Oceanography. 61 (1): 57–98. Bibcode:2004PrOce..61...57K. doi:10.1016/j.pocean.2004.06.002.
  3. ↑ Murillo, Francisco Javier; Muñoz, Pablo Durán; Cristobo, Javier; Ríos, Pilar; González, Concepción; Kenchington, Ellen; Serrano, Alberto (2012-11-01). "Deep-sea sponge grounds of the Flemish Cap, Flemish Pass and the Grand Banks of Newfoundland (Northwest Atlantic Ocean): Distribution and species composition". Marine Biology Research. 8 (9): 842–854. doi:10.1080/17451000.2012.682583. hdl: 10508/927 . ISSN   1745-1000. S2CID   83867051.
  4. 1 2 3 Cárdenas, Paco; Rapp, Hans Tore; Schander, Christoffer; Tendal, Ole S. (2010-01-01). "Molecular taxonomy and phylogeny of the Geodiidae (Porifera, Demospongiae, Astrophorida) – combining phylogenetic and Linnaean classification". Zoologica Scripta. 39 (1): 89–106. doi:10.1111/j.1463-6409.2009.00402.x. hdl: 1956/4020 . ISSN   1463-6409. S2CID   85137461.
  5. ↑ Cárdenas, Paco; Rapp, Hans Tore; Klitgaard, Anne Birgitte; Best, Megan; Thollesson, Mikael; Tendal, Ole Secher (2013-10-01). "Taxonomy, biogeography and DNA barcodes of Geodia species (Porifera, Demospongiae, Tetractinellida) in the Atlantic boreo-arctic region". Zoological Journal of the Linnean Society. 169 (2): 251–311. doi: 10.1111/zoj.12056 . ISSN   1096-3642.
  6. ↑ Radax, Regina; Rattei, Thomas; Lanzen, Anders; Bayer, Christoph; Rapp, Hans Tore; Urich, Tim; Schleper, Christa (2012-05-01). "Metatranscriptomics of the marine sponge Geodia barretti: tackling phylogeny and function of its microbial community". Environmental Microbiology. 14 (5): 1308–1324. doi:10.1111/j.1462-2920.2012.02714.x. ISSN   1462-2920. PMID   22364353.
  7. 1 2 Cárdenas, Paco; Proux-Wéra, Estelle; Soler, Lucile; Churcher, Allison M.; Steffen, Karin (2023-08-24). "Whole genome sequence of the deep-sea sponge Geodia barretti (Metazoa, Porifera, Demospongiae)". G3. doi: 10.1093/g3journal/jkad192 .
  8. ↑ Cárdenas, Paco; Xavier, Joana R.; Reveillaud, Julie; Schander, Christoffer; Rapp, Hans Tore (2011). "Molecular Phylogeny of the Astrophorida (Porifera, Demospongiaep) Reveals an Unexpected High Level of Spicule Homoplasy". PLOS ONE. 6 (4): e18318. Bibcode:2011PLoSO...618318C. doi: 10.1371/journal.pone.0018318 . PMC   3072971 . PMID   21494664.
  9. ↑ "Taxonomisk information". www.dyntaxa.se. Retrieved 2016-04-14.
  10. ↑ "Artsdatabanken". artsdatabanken.
  11. ↑ Cárdenas, Paco; Rapp, Hans Tore (November 2015). "Demosponges from the Northern Mid-Atlantic Ridge shed more light on the diversity and biogeography of North Atlantic deep-sea sponges". Journal of the Marine Biological Association of the United Kingdom. 95 (7): 1475–1516. doi: 10.1017/s0025315415000983 . hdl: 1956/11713 . ISSN   0025-3154.
  12. ↑ Cárdenas, Paco; Rapp, Hans Tore (2013-09-01). "Disrupted spiculogenesis in deep-water Geodiidae (Porifera, Demospongiae) growing in shallow waters". Invertebrate Biology. 132 (3): 173–194. doi:10.1111/ivb.12027. ISSN   1744-7410.
  13. ↑ Spetland, Frank; Rapp, Hans Torre; Hoffmann, Friederike; Tendal, Ole Secher (2007). "Sexual reproduction of Geodia barretti Bowerbank, 1858 (Porifera, Astrophorida) in two Scandinavian fjords". In: M. R. Custódio, e. Hajdu, G. Lóbo-Hajdu & G. Muricy (Eds), Porifera Research: Biodiversity, Innovation and Sustainability. Proceedings of the 7th International Sponge Symposium. Série Livros 28, Museu Nacional, Rio de Janeiro: 613–620.
  14. 1 2 Koutsouveli, Vasiliki; Cárdenas, Paco; Conejero, Maria; Rapp, Hans Tore; Riesgo, Ana (2020-12-18). "Reproductive Biology of Geodia Species (Porifera, Tetractinellida) From Boreo-Arctic North-Atlantic Deep-Sea Sponge Grounds". Frontiers in Marine Science. 7: 595267. doi: 10.3389/fmars.2020.595267 . hdl: 10261/233484 . ISSN   2296-7745.
  15. ↑ Koutsouveli, Vasiliki; Cárdenas, Paco; Santodomingo, Nadiezhda; Marina, Anabel; Morato, Esperanza; Rapp, Hans Tore; Riesgo, Ana (2020-12-16). Chang, Belinda (ed.). "The Molecular Machinery of Gametogenesis in Geodia Demosponges (Porifera): Evolutionary Origins of a Conserved Toolkit across Animals". Molecular Biology and Evolution. 37 (12): 3485–3506. doi:10.1093/molbev/msaa183. ISSN   0737-4038. PMC   7743902 . PMID   32929503.
  16. ↑ Warrén, Anders; Klitgaard, Anne (1991). "Hanleya nagelfar, a sponge-feeding ecotype of H. hanleyi or a distinct species of chiton". Ophelia. 34: 51–70. doi:10.1080/00785326.1991.10429706.
  17. ↑ Cedhagen, Tomas (1994-07-15). "Taxonomy and biology of Hyrrokkin sarcophaga gen. et sp. n., a parasitic foraminiferan (Rosalinidae)". Sarsia. 79 (1): 65–82. doi:10.1080/00364827.1994.10413549. ISSN   0036-4827.
  18. ↑ Klitgaard, Anne B. (1995-07-26). "The fauna associated with outer shelf and upper slope sponges (Porifera, Demospongiae) at the Faroe Islands, northeastern Atlantic". Sarsia. 80 (1): 1–22. CiteSeerX   10.1.1.376.4604 . doi:10.1080/00364827.1995.10413574. ISSN   0036-4827.
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  20. 1 2 Leys, S. P.; Kahn, A. S.; Fang, J. K. H.; Kutti, T.; Bannister, R. J. (2018). "Phagocytosis of microbial symbionts balances the carbon and nitrogen budget for the deep-water boreal sponge Geodia barretti". Limnology and Oceanography. 63 (1): 187–202. Bibcode:2018LimOc..63..187L. doi: 10.1002/lno.10623 . ISSN   1939-5590. S2CID   54060341.
  21. ↑ Ian, Elena; Malko, Dmitry B.; Sekurova, Olga N.; Bredholt, Harald; Rückert, Christian; Borisova, Marina E.; Albersmeier, Andreas; Kalinowski, Jörn; Gelfand, Mikhail S. (2014-05-12). "Genomics of Sponge-Associated Streptomyces spp. Closely Related to Streptomyces albus J1074: Insights into Marine Adaptation and Secondary Metabolite Biosynthesis Potential". PLOS ONE. 9 (5): e96719. Bibcode:2014PLoSO...996719I. doi: 10.1371/journal.pone.0096719 . ISSN   1932-6203. PMC   4018334 . PMID   24819608.
  22. ↑ Sandoval-Powers, Megan; Králová, Stanislava; Nguyen, Giang-Son; Fawwal, Dorelle V.; Degnes, Kristin; Lewin, Anna Sofia; Klinkenberg, Geir; Wentzel, Alexander; Liles, Mark R. (2021-09-01). "Streptomyces poriferorum sp. nov., a novel marine sponge-derived Actinobacteria species expressing anti-MRSA activity". Systematic and Applied Microbiology. 44 (5): 126244. doi:10.1016/j.syapm.2021.126244. ISSN   0723-2020. PMID   34392062.
  23. ↑ Nouioui, Imen; Rückert, Christian; Willemse, Joost; Wezel, Gilles P. van; Klenk, Hans-Peter; Busche, Tobias; Kalinowski, Jörn; Bredholt, Harald; Zotchev, Sergey B. (2017). "Actinoalloteichus fjordicus sp. nov. isolated from marine sponges: phenotypic, chemotaxonomic and genomic characterisation". Antonie van Leeuwenhoek. 110 (12): 1705–1717. doi:10.1007/s10482-017-0920-9. PMC   5676828 . PMID   28770445.
  24. ↑ Carstens, Bodil B.; Rosengren, K. Johan; Gunasekera, Sunithi; Schempp, Stefanie; Bohlin, Lars; Dahlström, Mia; Clark, Richard J.; Göransson, Ulf (2015-08-28). "Isolation, Characterization, and Synthesis of the Barrettides: Disulfide-Containing Peptides from the Marine Sponge Geodia barretti". Journal of Natural Products. 78 (8): 1886–1893. doi: 10.1021/acs.jnatprod.5b00210 . ISSN   0163-3864. PMID   26222779.
  25. 1 2 Erngren, Ida; Smit, Eva; Pettersson, Curt; Cárdenas, Paco; Hedeland, Mikael (2021-05-10). "The Effects of Sampling and Storage Conditions on the Metabolite Profile of the Marine Sponge Geodia barretti". Frontiers in Chemistry. 9: 662659. Bibcode:2021FrCh....9..314E. doi: 10.3389/fchem.2021.662659 . ISSN   2296-2646. PMC   8141568 . PMID   34041223.
  26. ↑ Lidgren, Göran; Bohlin, Lars; Bergman, Jan (January 1986). "Studies of swedish marine organisms VII. A novel biologically active indole alkaloid from the sponge Geodia baretti". Tetrahedron Letters. 27 (28): 3283–3284. doi:10.1016/s0040-4039(00)84776-0. ISSN   0040-4039.
  27. 1 2 3 Sjögren, Martin; Göransson, Ulf; Johnson, Ann-Louise; Dahlström, Mia; Andersson, Rolf; Bergman, Jan; Jonsson, Per R.; Bohlin, Lars (March 2004). "Antifouling Activity of Brominated Cyclopeptides from the Marine SpongeGeodia barretti". Journal of Natural Products. 67 (3): 368–372. doi:10.1021/np0302403. ISSN   0163-3864. PMID   15043412.
  28. 1 2 3 4 Hedner, Erik; Sjögren, Martin; Frändberg, Per-Anders; Johansson, Tobias; Göransson, Ulf; Dahlström, Mia; Jonsson, Per; Nyberg, Fred; Bohlin, Lars (October 2006). "Brominated Cyclodipeptides from the Marine Sponge Geodia barretti as Selective 5-HT Ligands". Journal of Natural Products. 69 (10): 1421–1424. doi:10.1021/np0601760. ISSN   0163-3864. PMID   17067154.
  29. 1 2 3 Lind, Karianne F.; Hansen, Espen; Østerud, Bjarne; Eilertsen, Karl-Erik; Bayer, Annette; Engqvist, Magnus; Leszczak, Kinga; Jørgensen, Trond Ø; Andersen, Jeanette H. (2013-07-22). "Antioxidant and Anti-Inflammatory Activities of Barettin". Marine Drugs. 11 (7): 2655–2666. doi: 10.3390/md11072655 . PMC   3736444 . PMID   23880935.
  30. ↑ Lind, K. F; Østerud, B. (2015). "The immunomodulatory effects of barettin and involvement of the kinases CAMK1α and RIPK2". Immunopharmacology and Immunotoxicology. 37 (5): 458–464. doi:10.3109/08923973.2015.1082584. PMID   26466644. S2CID   21255063.
  31. 1 2 3 4 5 6 Olsen, Elisabeth K.; Hansen, Espen; W. K. Moodie, Lindon; Isaksson, Johan; Sepčić, Kristina; Cergolj, Marija; Svenson, Johan; Andersen, Jeanette H. (2016). "Marine AChE inhibitors isolated from Geodia barretti: natural compounds and their synthetic analogs". Organic & Biomolecular Chemistry. 14 (5): 1629–1640. doi:10.1039/c5ob02416a. ISSN   1477-0520. PMID   26695619.
  32. 1 2 3 4 5 6 7 Omarsdottir, Sesselja; Tasdemir, Deniz; Molinski, Tadeusz; Freysdottir, Jona; Hardardottir, Ingibjorg; Rouger, Caroline; Di, Xiaxia; Di, Xiaxia; Rouger, Caroline (November 2018). "6-Bromoindole Derivatives from the Icelandic Marine Sponge Geodia barretti: Isolation and Anti-Inflammatory Activity". Marine Drugs. 16 (11): 437. doi: 10.3390/md16110437 . PMC   6266195 . PMID   30413031.
  33. ↑ Tsetlin, Victor; Stonik, Valentin; Guzii, Alla; Spirova, Ekaterina; Makarieva, Tatyana; Kudryavtsev, Denis; Shelukhina, Irina; Kasheverov, Igor; Kasheverov, Igor E. (March 2015). "6-Bromohypaphorine from Marine Nudibranch Mollusk Hermissenda crassicornis is an Agonist of Human α7 Nicotinic Acetylcholine Receptor". Marine Drugs. 13 (3): 1255–1266. doi: 10.3390/md13031255 . PMC   4377982 . PMID   25775422.
  34. 1 2 3 4 Lidgren, Göran; Bohlin, Lars; Christophersen, Carsten (November 1988). "Studies of Swedish Marine Organisms, Part X. Biologically Active Compounds from the Marine Sponge Geodia baretti". Journal of Natural Products. 51 (6): 1277–1280. doi:10.1021/np50060a041. ISSN   0163-3864.
  35. 1 2 3 Carstens, Bodil B.; Rosengren, K. Johan; Gunasekera, Sunithi; Schempp, Stefanie; Bohlin, Lars; Dahlström, Mia; Clark, Richard J.; Göransson, Ulf (2015-07-29). "Isolation, Characterization, and Synthesis of the Barrettides: Disulfide-Containing Peptides from the Marine Sponge Geodia barretti". Journal of Natural Products. 78 (8): 1886–1893. doi: 10.1021/acs.jnatprod.5b00210 . ISSN   0163-3864. PMID   26222779.
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  39. ↑ Thiel, Volker; Blumenberg, Martin; Hefter, Jens; Pape, Thomas; Pomponi, Shirley; Reed, John; Reitner, Joachim; Wörheide, Gert; Michaelis, Walter (2002-02-01). "A chemical view of the most ancient metazoa – biomarker chemotaxonomy of hexactinellid sponges" (PDF). Naturwissenschaften. 89 (2): 60–66. Bibcode:2002NW.....89...60T. doi:10.1007/s00114-001-0284-9. ISSN   0028-1042. PMID   12046622. S2CID   23387155.
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