Salpingoeca rosetta
Salpingoeca rosetta | |
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Scientific classification | |
Domain: | Eukaryota |
(unranked): | Opisthokonta |
(unranked): | Holozoa |
Class: | Choanoflagellatea |
Order: | Choanoflagellida |
Family: | Salpingoecidae |
Genus: | Salpingoeca |
Species: | S. rosetta |
Binomial name | |
Salpingoeca rosetta Dayel et al., 2011[1] | |
Subspecies or strains | |
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Synonyms | |
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Salpingoeca rosetta is a species of Choanoflagellates in the family Salpingoecidae. It is a rare marine eukaryote consisting of a number of cells embedded in a jelly-like matrix. This organism demonstrates a very primitive level of cell differentiation and specialization. This is seen with flagellated cells and their collar structures that move the cell colony through the water.
Similar low level cellular differentiation and specification can also be seen in sponges. They also have collar cells (also called choanocytes due to their similarities to choanoflaggellates) and amoeboid cells arranged in a gelatinous matrix.
Unlike S. rosetta, sponges also have other cell-types that can perform different functions. Also, the collar cells of sponges beat within canals in the sponge body, whereas Salpingoeca rosetta’s collar cells reside on the inside and it lacks internal canals. Despite these minor differences, there is strong evidence that Proterospongia and Metazoa are highly related.
Its genome has been studied as a model for Premetazoan evolution.[2] The genome is 55 megabases in size. Homologs of cell adhesion, neuropeptide and glycosphingolipid metabolism genes are present in the genome.
Sexual cycle
S. rosetta has a sexual cycle during which it transitions between haploid and diploid stages.[3] When nutrients become limiting, haploid cultures of S. rosetta become diploid. This ploidy shift coincides with mating during which small, flagellated cells fuse with larger flagellated cells. Evidence has also been obtained for historical mating and recombination in S. rosetta.
S. rosetta can be induced to undergo sexual reproduction by the marine bacterium Vibrio fischeri.[4] A single protein of V. fischeri, EroS, fully recapitulates the aphrodesiac-like activity of living V. fischeri.
References
- ↑ Cell differentiation and morphogenesis in the colony-forming choanoflagellate Salpingoeca rosetta. MJ Dayel, RA Alegado, SR Fairclough, TC Levin… - Developmental biology, 2011
- ↑ Premetazoan genome evolution and the regulation of cell differentiation in the choanoflagellate Salpingoeca rosetta. SR Fairclough, Z Chen, E Kramer, Q Zeng, S Young… - Genome biology, 2013
- ↑ Levin TC, King N (2013). "Evidence for sex and recombination in the choanoflagellate Salpingoeca rosetta". Curr. Biol. 23 (21): 2176–80. doi:10.1016/j.cub.2013.08.061. PMC 3909816. PMID 24139741.
- ↑ Woznica A, Gerdt JP, Hulett RE, Clardy J, King N (2017). "Mating in the Closest Living Relatives of Animals Is Induced by a Bacterial Chondroitinase". Cell. 170 (6): 1175–1183.e11. doi:10.1016/j.cell.2017.08.005. PMID 28867285.
External links