Ciona intestinalis

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Ciona intestinalis
Cionaintestinalis.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Subphylum: Tunicata
Class: Ascidiacea
Order: Phlebobranchia
Family: Cionidae
Genus: Ciona
Species:
C. intestinalis
Binomial name
Ciona intestinalis
(Linnaeus, 1767)
Synonyms [1]
List
    • Tethyum sociabile Gunnerus, 1765
    • Ciona sociabilis (Gunnerus, 1765)
    • Ascidia intestinalis Linnaeus, 1767
    • Phallusia intestinalis (Linnaeus, 1767)
    • Ascidia canina Mueller, 1776
    • Ascidia corrugata Müller, 1776
    • Ciona canina (Mueller, 1776)
    • Ascidia virens Fabricius, 1779
    • Ascidia viridiscens Brugière, 1792
    • Ascidia membranosa Renier, 1807
    • Ascidia virescens Pennant, 1812
    • Ascidia diaphanea Quoy & Gaimard, 1834
    • Ciona diaphanea (Quoy & Gaimard, 1834)
    • Ascidia ocellata Agassiz, 1850
    • Ciona ocellata (Agassiz, 1850)
    • Ascidia tenella Stimpson, 1852
    • Ciona tenella (Stimpson, 1852)
    • Ascidia pulchella Alder, 1863
    • Ciona pulchella (Alder, 1863)

Ciona intestinalis (sometimes known by the common name of vase tunicate) is an ascidian (sea squirt), a tunicate with very soft tunic. Its Latin name literally means "pillar of intestines", referring to the fact that its body is a soft, translucent column-like structure, resembling a mass of intestines sprouting from a rock. [2] It is a globally distributed cosmopolitan species: this species has been introduced to various parts of the world and is considered as an invasive species. [3] [4]

Contents

Since Linnaeus described the species, Ciona intestinalis has been used as a model species of an invertebrate chordate in developmental biology and genomics.

Taxonomy

Although Linnaeus first categorised Ciona intestinalis as a kind of mollusk, Alexander Kovalevsky found a tadpole-like larval stage during development that shows similarity to vertebrates. Recent molecular phylogenetic studies as well as phylogenomic studies support that sea squirts are the closest invertebrate relatives of vertebrates. [5]

Studies conducted between 2005 and 2010 have shown that this species may in fact be a species complex, with at least two, possibly four, sister species that should be split out from C. intestinalis. [6] [7] [8] [9] [ needs update ] One of these cryptic species were proven to be an already described species; Ciona robusta . [10]

Description

Ciona intestinalis illustrated in Fig. 1 - 8 BritishTunicataPlate21.jpg
Ciona intestinalis illustrated in Fig. 1 - 8

Ciona intestinalis is a solitary tunicate with a cylindrical, soft, gelatinous body, up to 20 centimetres (8 in) long. The body colour and colour at the distal end of siphons are major external characters distinguishing sister species within the species complex. [11]

The body of Ciona is bag-like and covered by a tunic, which is a secretion of the epidermal cells. The body is attached by a permanent base located at the posterior end, while the opposite extremity has two openings, the buccal and atrial siphons. Water is drawn into the ascidian through the buccal (oral) siphon and leaves the atrium through the atrial siphon (cloacal).

In the sea squirt C. intestinalis a CB1 and CB2-type cannabinoid receptors is found to be targeted to axons, indicative of an ancient role for cannabinoid receptors as axonal regulators of neuronal signalling. [12]

Genetics

Ciona intestinalis was one of the first animals to have its full genome sequenced in 2002, using a specimen from Half Moon Bay in California, US, [13] It possesses a very small genome size, about 160 Mbp, or less than 1/20 of the human genome, which consists of 14 pairs of chromosomes with about 16,000 genes. A number of these genes correspond to almost every family of genes in vertebrates. [14]

The draft genome analysis identified nine Hox genes, which are Ci-Hox1, 2, 3, 4, 5, 6, 10, 12, and 13. [13] Ciona robusta , the closest relative of Ciona intestinalis, also has the same set of Hox genes. The organization of Hox genes is only known for C. intestinalis among ascidians. The nine Hox genes are located on two chromosomes; Ci-Hox1 to 10 on one chromosome and Ci-Hox12 and 13 on another. The intergenic distances within the Ciona Hox genes are extraordinarily long. Seven Hox genes, Ci-Hox1 to 10, are distributed along approximately half the length of the chromosome. Comparisons to Hox gene expression and location in other species suggests that the Hox genes in ascidian genomes are under a dispersing condition. [15]

A majority of genetically encoded voltage indicator are based on the C. intestinalis voltage-sensitive domain (Ci-VSD).[ citation needed ]

There is one transferrin ortholog which is divergent from those of vertebrate models, and even more divergent from non-chordates. [16]

A retinol dehydrogenase –CiRdh10– is disclosed in Belyaeva et al. 2015. [17]

Reproduction

Ciona intestinalis is a hermaphroditic broadcast spawner though cannot self-fertilize. [18] Released gametes can stay in the water column for 1 to 2 days, while the larvae are free-swimming for 2 to 10 days.[ citation needed ]

C. intestinalis is self-sterile, as sperm and eggs into the surrounding seawater almost simultaneously, and thus has been used for studies on the mechanism of self-incompatibility. [19] Self/non-self-recognition molecules are considered to play a key role in the process of interaction between sperm and the vitelline coat of the egg. It appears that self/non-self recognition in ascidians such as C. intestinalis is mechanistically similar to self-incompatibility systems in flowering plants. [19] Self-incompatibility promotes out-crossing which provides the adaptive advantage at each generation of masking deleterious recessive mutations (i.e. genetic complementation). [20]

Relation to humans

C. intestinalis is a model species, used in studies of developmental biology and genomics. [21]

Ciona intestinalis is considered to be an invasive species and grows in dense aggregations on any floating or submerged substrate, particularly artificial structures like pilings, aquaculture gear, floats and boat hulls, in the lower intertidal to sub-tidal zones. It often grows with or on other fouling organisms. It is thought to spread to new areas mainly through hull fouling. Since its larvae can live for up to 10 days, this species may also be transferred through the release of bilge or ballast water.

The potential impact of C. intestinalis and its introduction to new habitats can be avoided, so most agencies suggest that fish and shellfish harvesters are to avoid transfer of harvested shellfish and fishing gear to other areas, and to dry gear thoroughly before transfer, along with inspecting boat hulls. They also recommend that, if necessary, to clean them thoroughly, and to disinfect with bleach or vinegar and dry them before moving to other areas. Agencies also recommended the disposal of any organisms removed from boat hulls or gear on land and to release bilge water on land or disinfect it.

References

  1. ↑ "Ciona intestinalis (Linnaeus, 1767)". WoRMS. World Register of Marine Species . Retrieved 2026-01-12.
  2. ↑ Lane, Nick (2010-06-14). Life Ascending: The Ten Great Inventions of Evolution. W. W. Norton & Company. p. 192. ISBN   978-0393338669.
  3. ↑ Blum, J.C.; Chang, AL.; Liljesthröm, M.; Schenk, M.E.; Steinberg, M.K.; Ruiz, G.M. (2007). "The non-native solitary ascidian Ciona intestinalis (L.) depresses species richness". Journal of Experimental Marine Biology and Ecology. 342: 5–14. doi:10.1016/j.jembe.2006.10.010.
  4. ↑ Herridge, Paul (June 11, 2013). "The vase tunicate has landed". The Southern Gazette. Marystown, Newfoundland and Labrador. Archived from the original on June 28, 2013. Retrieved June 26, 2013.
  5. ↑ Putnam, NH; Butts T; Ferrier DE; Furlong RF; Fellsten U; et al. (June 2008). "The amphioxus genome and the evolution of the chordate karyotype". Nature. 453 (7198): 1064–71. Bibcode:2008Natur.453.1064P. doi: 10.1038/nature06967 . PMID   18563158.
  6. ↑ Suzuki, Miho M; Nishikawa T; Bird A (2005). "Genomic approaches reveal unexpected genetic divergence within Ciona intestinalis". J Mol Evol. 61 (5): 627–635. Bibcode:2005JMolE..61..627S. doi:10.1007/s00239-005-0009-3. PMID   16205978. S2CID   5173.
  7. ↑ Caputi, Luisi; Andreakis N; Mastrototaro F; Cirino P; Vassillo M; Sordino P (2007). "Cryptic speciation in a model invertebrate chordate". Proceedings of the National Academy of Sciences USA. 104 (22): 9364–9369. Bibcode:2007PNAS..104.9364C. doi: 10.1073/pnas.0610158104 . PMC   1890500 . PMID   17517633.
  8. ↑ Zhan, A; Macisaac HJ; Cristescu ME (2010). "Invasion genetics of the Ciona intestinalis species complex: from regional endemism to global homogeneity". Molecular Ecology. 19 (21): 4678–4694. doi:10.1111/j.1365-294x.2010.04837.x. PMID   20875067. S2CID   205363202.
  9. ↑ Malfant, Marine; Darras, Sebastien; Viard, Viard (24 January 2018). "Coupling molecular data and experimental crosses sheds light about species delineation: a case study with the genus Ciona". Scientific Reports. 8 (1): 1480. doi:10.1038/s41598-018-19811-2. PMC   5784138 . PMID   29367599.
  10. ↑ Brunetti, Riccardo; Gissi C; Pennati R; Caicci F; Gasparini F; Manni L (2015). "Morphological evidence that the molecularly determined Ciona intestinalis type A and type B are different species: Ciona robusta and Ciona intestinalis". Journal of Zoological Systematics and Evolutionary Research. 53 (3): 186–193. doi: 10.1111/jzs.12101 . hdl: 11577/3155577 .
  11. ↑ Sato, Atsuko; Satoh N; Bishop JDD (2012). "Field identification of the ascidian species complex Ciona intestinalis in the region of symatory". Marine Biology. 159 (7): 1611–1619. doi:10.1007/s00227-012-1898-5. S2CID   84148906.
  12. ↑ Elphick, Maurice R. (2012-12-05). "The evolution and comparative neurobiology of endocannabinoid signalling". Philosophical Transactions of the Royal Society B: Biological Sciences. 367 (1607): 3201–3215. doi:10.1098/rstb.2011.0394. ISSN   0962-8436. PMC   3481536 . PMID   23108540.
  13. 1 2 Dehal, P; Satou Y; Campbell RK; et al. (December 2002). "The draft genome of Ciona intestinalis: insights into chordate and vertebrate origins" (PDF). Science. 298 (5601): 2157–2166. Bibcode:2002Sci...298.2157D. doi:10.1126/science.1080049. PMID   12481130. S2CID   15987281. Archived from the original (PDF) on 2017-09-22. Retrieved 2019-09-26.
  14. ↑ Shoguchi, Eiichi; Kawashima, Takeshi; Nishida-Umehara, Chizuko; Matsuda, Yoichi; Satoh, Nori (2005). "Molecular Cytogenetic Characterization of Ciona intestinalis Chromosomes". Zoological Science. 22 (5): 511–6. doi:10.2108/zsj.22.511. hdl: 2433/57195 . PMID   15930823. S2CID   22661234.
  15. ↑ Ikuta, Tetsuro, and Hidetoshi Saiga. "Organization of Hox genes in ascidians: Present, past, and future." Developmental Dynamics 233.2 (2005): 382-89.
  16. ↑ Gabaldón, Toni; Koonin, Eugene V. (2013-04-04). "Functional and evolutionary implications of gene orthology". Nature Reviews Genetics . 14 (5). Nature Portfolio: 360–366. doi:10.1038/nrg3456. ISSN   1471-0056. PMC   5877793 . PMID   23552219.
  17. ↑ Bedois, Alice M. H.; Parker, Hugo Jonathan; Krumlauf, Robb (2021-08-23). "Retinoic Acid Signaling in Vertebrate Hindbrain Segmentation: Evolution and Diversification". Diversity. 13 (8). MDPI: 398. doi: 10.3390/d13080398 . ISSN   1424-2818. S2CID   238675287.(HJP ORCID 0000-0001-7646-2007).
  18. ↑ Harada, Y; Takagi Y; et al. (2008). "Mechanisms of self-fertility in a hermaphroditic chordate". Science. 320 (5875): 548–50. doi: 10.1126/science.1152488 . PMID   18356489. S2CID   12250316.
  19. 1 2 Sawada H, Morita M, Iwano M (August 2014). "Self/non-self recognition mechanisms in sexual reproduction: new insight into the self-incompatibility system shared by flowering plants and hermaphroditic animals". Biochem. Biophys. Res. Commun. 450 (3): 1142–8. doi:10.1016/j.bbrc.2014.05.099. PMID   24878524.
  20. ↑ Bernstein H, Byerly HC, Hopf FA, Michod RE (September 1985). "Genetic damage, mutation, and the evolution of sex". Science. 229 (4719): 1277–81. Bibcode:1985Sci...229.1277B. doi:10.1126/science.3898363. PMID   3898363.
  21. ↑ Satoh, Nori (2003). "The ascidian tadpole larva: comparative molecular development and genomics". Nature Reviews Genetics. 4 (4): 285–295. doi:10.1038/nrg1042. PMID   12671659. S2CID   27548417.
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