Strongylocentrotus purpuratus

Strongylocentrotus purpuratus
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Subclass: Euechinoidea
Superorder: Echinacea
Order: Echinoida
Family: Strongylocentrotidae
Genus: Strongylocentrotus
Species: S. purpuratus
Binomial name
Strongylocentrotus purpuratus
(Stimpson, 1857)
Strongylocentrotus purpuratus range
Oral surface of Strongylocentrotus purpuratus showing teeth of Aristotle's Lantern, spines and tube feet.
Strongylocentrotus purpuratus

The purple sea urchin, Strongylocentrotus purpuratus, lives along the eastern edge of the Pacific Ocean extending from Ensenada, Mexico to British Columbia, Canada.[1] This sea urchin species is deep purple in color, eggs are orange when secreted in water,[2] and lives in lower inter-tidal and nearshore sub-tidal communities. January, February, and March function as the typical active reproductive months for the species. Sexual maturity is reached around two years.[3]

It normally grows to a diameter of about 4 inches and may live as long as 70 years.[4]

Role in biomedical research

While embryonic development is still a major part of the utilization of the sea urchin, studies on urchin's position as an evolutionary marvel have become increasingly frequent. Orthologs to human diseases have led scientists to investigate potential therapeutic uses for the sequences found in Strongylocentrotus purpuratus. For instance, in 2012, scientists at the University of St Andrews began investigating the "2A" viral region in the S. purpuratus genome[5][6] which may be useful for Alzheimer's disease and cancer research. The study identified a sequence that can return cells to a 'stem-cell' like state, allowing for better treatment options.[5] The species has also been a candidate in longevity studies, particularly because of its ability to regenerate damaged or aging tissue. Another study comparing 'young' vs. 'old' suggested that even in species with varying lifespans, the 'regenerative potential' was upheld in older specimens as they suffered no significant disadvantages compared to younger ones.[7]

Genome

Its genome was completely sequenced and annotated in 2006 by teams of scientists from over 70 institutions including the Kerckhoff Marine Laboratory at the California Institute of Technology as well as the Human Genome Sequencing Center at the Baylor College of Medicine.[8] Strongylocentrotus purpuratus is one of several biomedical research models in cell and developmental biology.[9] The sea urchin is the first animal with a sequenced genome that (1) is a free-living, motile marine invertebrate; (2) has a bilaterally organized embryo but a radial adult body plan; (3) has the endoskeleton and water vascular system found only in echinoderms; and (4) has a nonadaptive immune system that is unique in the enormous complexity of its receptor repertoire.[10]

The sea urchin genome is estimated to encode about 23,500 genes. The S. purpuratus has 353 protein kinases, containing members of 97% of human kinase subfamilies.[11] Many of these genes were previously thought to be vertebrate innovations or were only known from groups outside the deuterostomes. The team sequencing the species concluded that some genes are not vertebrate specific as thought previously, while other genes still were found in the urchin but not the chordate.

The genome is largely non-redundant, making it very comparable to vertebrates, but without the complexity. For example, 200 to 700 chemosensory genes were found that lacked introns, a feature typical of vertebrates.[11] Thus the sea urchin genome provides a comparison to our own and those of other deuterostomes, the larger group to which both echinoderms and humans belong.[10] Sea urchins are also the closest living relative to chordates.[11] Using the strictest measure, the purple sea urchin and humans share 7,700 genes.[12] Many of these genes are involved in sensing the environment,[13] a fact surprising for an animal lacking a head structure.

The sea urchin also has a chemical 'defensome' that reacts when stress is sensed to eliminate potentially toxic chemicals.[11] S. purpuratuses' immune systems contains innate pathogen receptors like Toll-like receptors and genes that encode for LRR . There were genes identified for Biomineralization that were not counterparts of the typical human vertebrate variety SCCPs, and encode for transmembrane proteins like P16. Many orthologs exist for genes associated with human diseases, such as Reelin (from Norman-Roberts lissencephaly syndrome) and many cytoskeletal proteins of the Usher syndrome network like usherin and VLGR1.[11]

Ecology and economics

The purple sea urchin, along with sea otters and abalones, is a prominent member of the kelp forest community.[14] Sea urchins have been used for food by the indigenous peoples of California. They ate the yellow egg mass raw.[15][16]

Close up of Strongylocentrotus purpuratus clearly showing tube feet.

See also

References

  1. ↑ Ricketts EF, Calvin J. Between Pacific Tides. 3rd Rev. edn. 1962 by J.W. Hedgpeth. XII 516. Stanford University Press, Stanford, CA. 1939
  2. ↑ "Sea Urchin Research | ASU - Ask A Biologist". askabiologist.asu.edu. 2010-04-16. Retrieved 2016-12-05.
  3. ↑ "Strongylocentrotus purpuratus". Animal Diversity Web. Retrieved 2016-12-05.
  4. ↑ T.A. Ebert, J. R. Southon, 2003. Fish. Bull. 101, 915
  5. 1 2 "Sea urchins could contain the genetic key to curing some diseases". Retrieved 2016-12-05.
  6. ↑ Ryan, Dr Martin. "M. Ryan". www.st-andrews.ac.uk. Retrieved 2016-12-12.
  7. ↑ Bodnar, Andrea G.; Coffman, James A. (2016-08-01). "Maintenance of somatic tissue regeneration with age in short- and long-lived species of sea urchins". Aging Cell. 15 (4): 778–787. doi:10.1111/acel.12487. ISSN 1474-9726. PMC 4933669. PMID 27095483.
  8. ↑ "California Purple Sea-Urchin Genome Sequenced by International Team | Caltech". The California Institute of Technology. Retrieved 2016-12-05.
  9. ↑ SU White Paper
  10. 1 2 Sodergren, E.; Sodergren, G. M.; Weinstock, E. H.; Davidson, R. A.; Cameron, R. A.; Gibbs, R. C.; Angerer, L. M.; Angerer, M. I.; Arnone, D. R.; Burgess, R. D.; Burke, J. A.; Coffman, M.; Dean, M. R.; Elphick, C. A.; Ettensohn, K. R.; Foltz, A.; Hamdoun, R. O.; Hynes, W. H.; Klein, W.; Marzluff, D. R.; McClay, R. L.; Morris, A.; Mushegian, J. P.; Rast, L. C.; Smith, M. C.; Thorndyke, V. D.; Vacquier, G. M.; Wessel, G.; Wray, L.; Zhang, C. G. (2006). "The Genome of the Sea Urchin Strongylocentrotus purpuratus". Science. 314 (5801): 941–952. doi:10.1126/science.1133609. PMC 3159423. PMID 17095691.
  11. 1 2 3 4 5 Sodergren, E; Weinstock, GM; Davidson, EH; et al. (2006-11-10). "The Genome of the Sea Urchin Strongylocentrotus purpuratus". Science. 314 (5801): 941–952. doi:10.1126/science.1133609. ISSN 0036-8075. PMC 3159423. PMID 17095691.
  12. ↑ Materna, S.C., K. Berney, and R.A. Cameron. 2006a. The S. purpuratus genome: A comparative perspective" Dev. Biol. 300: 485-495.
  13. ↑ Burke, R.D.; Angerer, L.M.; Elphick, M.R.; Humphrey, G.W.; Yaguchi, S.; Kiyama, T.; Liang, S.; Mu, X.; Agca, C.; Klein, W.H.; Brandhorst, B.P.; Rowe, M.; Wilson, K.; Churcher, A.M.; Taylor, J.S.; Chen, N.; Murray, G.; Wang, D.; Mellott, D.; Olinski, R.; Hallböök, F.; Thorndyke, M.C. (2006). "A genomic view of the sea urchin nervous system". Dev. Biol. 300: 434–460. doi:10.1016/j.ydbio.2006.08.007.
  14. ↑ Pearse, J. S. (2006). "The ecological role of purple sea urchins". Science. 314: 940–941. doi:10.1126/science.1131888.
  15. ↑ D. Sweetnam et al., Calif. Coop. Oceanic Fish. Invest. Rep. 46: 10 (2005).
  16. ↑ Heizer, Robert Fleming; Elsasser, Albert B. (1980-01-01). The Natural World of the California Indians. University of California Press. ISBN 9780520038967.
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