Over one-half billion years of head conservation? Expression of an ems class gene in Hydractinia symbiolongicarpus (Cnidaria: Hydrozoa).
Proc Natl Acad Sci U S A
; 95(7): 3673-8, 1998 Mar 31.
Article
in En
| MEDLINE
| ID: mdl-9520424
ABSTRACT
We report the isolation of an empty spiracles class homeodomain-containing gene, Cn-ems, from the hydrozoan Hydractinia symbiolongicarpus, the first gene of this class characterized in a lower metazoan. Cn-ems was found to be expressed in the head of gastrozooids, specifically in endodermal epithelial cells of the taeniolae of the hypostome. Cn-ems is not expressed in gonozooids, which lack taeniolae. Experimental conversion of the posterior region of the planula larva into head structures up-regulates expression of the gene. These findings establish that the association of ems-class genes with head structures preceded the evolution of bilateral symmetry.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Homeodomain Proteins
/
Drosophila Proteins
/
Hydra
Limits:
Animals
Language:
En
Journal:
Proc Natl Acad Sci U S A
Year:
1998
Document type:
Article
Affiliation country:
Israel