Sea Squirt Development: Difference between revisions

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[[File:Invertebrate_chordate_notochords.jpg]]
[[File:Invertebrate_chordate_notochords.jpg]]


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Ciona intestinalis notochord<ref><pubmed>21251298</pubmed>| [http://www.biomedcentral.com/1741-7007/9/3 BMC Biol.]</ref>
::::(b) Ciona intestinalis notochord<ref><pubmed>21251298</pubmed>| [http://www.biomedcentral.com/1741-7007/9/3 BMC Biol.]</ref>


==Neural==
==Neural==

Revision as of 19:56, 31 May 2012

Introduction

Sea squirt - ciona intestinalis
Ascidian hox expression[1]

Sea squirts (ascidians, Ascidiacea) are filter feeding marine animals, primitive chordates, that exist in many shapes and sizes. They reproduce by either sexual or asexual (budding) and develop through a laval (tadpole) to an adult phase. Some species have transparent eggs and embryos simplifying developmental imaging.

Links:

Animal Development: axolotl | bat | cat | chicken | cow | dog | dolphin | echidna | fly | frog | goat | grasshopper | guinea pig | hamster | horse | kangaroo | koala | lizard | medaka | mouse | opossum | pig | platypus | rabbit | rat | salamander | sea squirt | sea urchin | sheep | worm | zebrafish | life cycles | development timetable | development models | K12
Historic Embryology  
1897 Pig | 1900 Chicken | 1901 Lungfish | 1904 Sand Lizard | 1905 Rabbit | 1906 Deer | 1907 Tarsiers | 1908 Human | 1909 Northern Lapwing | 1909 South American and African Lungfish | 1910 Salamander | 1951 Frog | Embryology History | Historic Disclaimer

Some Recent Findings

  • Neurula rotation determines left-right asymmetry in ascidian tadpole larvae[2] "Tadpole larvae of the ascidian Halocynthia roretzi show morphological left-right asymmetry. ... We suggest that chemical, and not mechanical, signals from the vitelline membrane promote nodal expression. Neurula rotation is also conserved in other ascidian species."
  • Creating 3D digital replicas of ascidian embryos from stacks of confocal images.[3] "During embryonic development, cell behaviors that are tightly coordinated both spatially and temporally integrate at the tissue level and drive embryonic morphogenesis. Over the past 20 years, advances in imaging techniques, in particular, the development of confocal imaging, have opened a new world in biology, not only giving us access to a wealth of information, but also creating new challenges. It is sometimes difficult to make the best use of the recordings of the complex, inherently three-dimensional (3D) processes we now can observe. In particular, these data are often not directly suitable for even simple but conceptually fundamental quantifications. This article describes a process whereby image stacks gathered from live or fixed ascidian embryos are digitalized and segmented to produce 3D embryo replicas. These replicas can then be interfaced via a 3D Virtual Embryo module to a model organism database (Aniseed) that allows one to relate the geometrical properties of cells and cell contacts to additional parameters such as cell lineage, cell fates, or the underlying genetic program. Such an integrated system can serve several general purposes. First, it makes it possible to quantify and better understand the dynamics of cell behaviors during embryonic development, including, for instance, the automatic detection of asymmetric cell divisions or the evolution of cell contacts. Second, the 3D Virtual Embryo software proposes a panel of mathematical shape descriptors to precisely quantify cellular geometries and generate a 3D identity card for each embryonic cell. Such reconstructions open the door to a detailed 3D simulation of morphogenesis."

Early Development

Invertebrate chordate notochords.jpg

(b) Ciona intestinalis notochord[4]

Neural

  • ascidians lack a segmented hindbrain, but have restricted expression patterns of anterior Hox genes.[5]

Historic Images

References

  1. <pubmed>22085760</pubmed>| BMC Evol Biol.
  2. <pubmed>22399684</pubmed>
  3. <pubmed>21969625</pubmed>
  4. <pubmed>21251298</pubmed>| BMC Biol.
  5. <pubmed>10518491</pubmed>

Reviews

<pubmed>21558365</pubmed>

Articles

Search Pubmed

Search Pubmed: Sea Squirt Development

External Links

External Links Notice - The dynamic nature of the internet may mean that some of these listed links may no longer function. If the link no longer works search the web with the link text or name. Links to any external commercial sites are provided for information purposes only and should never be considered an endorsement. UNSW Embryology is provided as an educational resource with no clinical information or commercial affiliation.

Animal Development: axolotl | bat | cat | chicken | cow | dog | dolphin | echidna | fly | frog | goat | grasshopper | guinea pig | hamster | horse | kangaroo | koala | lizard | medaka | mouse | opossum | pig | platypus | rabbit | rat | salamander | sea squirt | sea urchin | sheep | worm | zebrafish | life cycles | development timetable | development models | K12
Historic Embryology  
1897 Pig | 1900 Chicken | 1901 Lungfish | 1904 Sand Lizard | 1905 Rabbit | 1906 Deer | 1907 Tarsiers | 1908 Human | 1909 Northern Lapwing | 1909 South American and African Lungfish | 1910 Salamander | 1951 Frog | Embryology History | Historic Disclaimer

Glossary Links

Glossary: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Term Link

Cite this page: Hill, M.A. (2024, March 28) Embryology Sea Squirt Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Sea_Squirt_Development

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G