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Echinobase
ECB-ART-36370
Proc Natl Acad Sci U S A 1996 Jun 25;9313:6759-63. doi: 10.1073/pnas.93.13.6759.
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Postembryonic segregation of the germ line in sea urchins in relation to indirect development.

Ransick A , Cameron RA , Davidson EH .


Abstract
The four small micromeres of the sea urchin embryo contribute only to the coelomic sacs, which produce major components of the adult body plan during postembryonic development. To test the proposition that the small micromeres are the definitive primordial germ cell lineage of the sea urchin, we deleted their 4th cleavage parents, and raised the deleted embryos through larval life and metamorphosis to sexual maturity. Almost all of the experimental animals produced functional gametes, excluding the possibility that the germ cell lineage arises exclusively and obligatorily from descendants of the small micromeres; rather, the germ cell lineage arises during the postembryonic development of the rudiment. A survey of the literature indicates that there is no known case of an embryonic primordial germ cell lineage in a bilaterian species that displays maximal indirect development.

PubMed ID: 8692891
PMC ID: PMC39100
Article link: Proc Natl Acad Sci U S A
Grant support: [+]

Genes referenced: LOC100887844 LOC105439231 LOC115919910

References [+] :
Armstrong, Cell-cell interactions regulate skeleton formation in the sea urchin embryo. 1993, Pubmed, Echinobase