Exp Neurobiol.  2010 Jun;19(1):49-53. 10.5607/en.2010.19.1.49.

Ectopic Expression of Ephrin-A5 Under the EphA8 Promoter at the Anterior Region of the Superior Colliculus

• Noh H
• Park S

• KMID: 2165319
• DOI: http://doi.org/10.5607/en.2010.19.1.49

Abstract

EphA/ephrin-A mediated signaling has emerged as a key mechanism regulating axon guidance and topographic mapping, particularly in the well-characterized visual system from the retina to the superior colliculus (SC). In this study, EphA8 bacterial artificial chromosome (BAC) was manipulated to contain a floxed eGFP and human ephrin-A5 expression cassette using homologous recombination method. In the mice containing the recombinant BAC, it was shown that GFP is expressed in an anterior>posterior gradient in the SC. Furthermore, when these mice were crossed with the transgenic mice expressing Cre under the EphA8 promoter, it was evident that a GFP expression cassette was eliminated, and that human ephrin-A5 was ectopically expressed in the anterior region of the SC. This transgenic model would be useful to analyze the role of ephrin-A5 in the SC during the retinocollicular topography formation.

Keyword

ephrin-A5; EphA8; superior colliculus; topographic mapping

MeSH Terms

Animals
Axons
Chromosomes, Artificial, Bacterial
Ephrin-A5
Homologous Recombination
Humans
Mice
Mice, Transgenic
Retina
Superior Colliculi
Ephrin-A5