NDLI: Engrailed is expressed in larval development and in the radial nervous system of Patiriella sea stars

Content Provider	Springer Nature Link
Author	Byrne, Maria Cisternas, Paula Elia, Laura Relf, Bronwyn
Copyright Year	2005
Abstract	We documented expression of the pan-metazoan neurogenic gene engrailed in larval and juvenile Patiriella sea stars to determine if this gene patterns bilateral and radial echinoderm nervous systems. Engrailed homologues, containing conserved En protein domains, were cloned from the radial nerve cord. During development, engrailed was expressed in ectodermal (nervous system) and mesodermal (coeloms) derivatives. In larvae, engrailed was expressed in cells lining the larval and future adult coeloms. Engrailed was not expressed in the larval nervous system. As adult-specific developmental programs were switched on during metamorphosis, engrailed was expressed in the central nervous system and peripheral nervous system (PNS), paralleling the pattern of neuropeptide immunolocalisation. Engrailed was first seen in the developing nerve ring and appeared to be up-regulated as the nervous system developed. Expression of engrailed in the nerve plexus of the tube feet, the lobes of the hydrocoel along the adult arm axis, is similar to the reiterated pattern of expression seen in other animals. Engrailed expression in developing nervous tissue reflects its conserved role in neurogenesis, but its broad expression in the adult nervous system of Patiriella differs from the localised expression seen in other bilaterians. The role of engrailed in patterning repeated PNS structures indicates that it may be important in patterning the fivefold organisation of the ambulacrae, a defining feature of the Echinodermata.
Starting Page	608
Ending Page	617
Page Count	10
File Format	PDF
ISSN	0949944X
Journal	Development Genes and Evolution
Volume Number	215
Issue Number	12
e-ISSN	1432041X
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-09-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engrailed Development Nervous system Asteroidea Echinodermata Animal Genetics and Genomics Biochemistry Cell Biology Neurosciences Developmental Biology
Content Type	Text
Resource Type	Article
Subject	Genetics Developmental Biology

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