The long-term objective of this proposal is to gain a better understanding of the genetic mechanism underlying vertebrate eye formation. The eye is a frequent target of human inherited diseases. To address this problem, an understanding of the genetic regulatory networks required for normal eye formation is essential. We have discovered that eye formation requires the coordinated action of a group of transcriptional regulators expressed in the eye primordia (or eye field). These eye field transcription factors (EFTFs) are sufficient to transform primitive ectoderm to eye primordia and functional eyes. The goals of this study are to identify the transcripts specifically expressed in the eye primordia and determine the first genetic targets of the regulatory network driving eye formation.
The specific aims are ? ? Aim 1: Genomics approach to identify transcripts expressed during eye primordia specification. We will first determine the gene expression profile of the eye primordia using microarray analysis. Next, we will compare the expression profiles of the endogenous eye primordia with that of EFTF-induced, in vitro produced, eye primorida to generate the first comprehensive profile of genes induced during early eye formation. ? ? Aim 2. Identify transcripts regulated by the eye primordia transcription factors. The transcription profiles for each EFTF will be determined using microarray analysis, quantitative PCR and in situ hybridization, to identify independently and coordinately regulated targets. ? ? The rationale for the proposed experiments is that the Xenopus transcriptosome required for eye formation will be a valuable tool for cross species comparisons, identification of new genes, and the generation of a preliminary map of the transcriptional network of eye formation. This network will also provide a foundation for systematic examination of new data and will help identify novel biological pathways requiring additional investigation. Identification of the genes and genetic pathways in the developing eye will provide a much-needed understanding of the genetic mechanisms underlying eye formation and provide a window into understanding and treating human blindness. ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY017964-02
Application #
7497863
Study Section
Special Emphasis Panel (ZRG1-GGG-T (52))
Program Officer
Araj, Houmam H
Project Start
2007-09-30
Project End
2011-08-31
Budget Start
2008-09-01
Budget End
2009-08-31
Support Year
2
Fiscal Year
2008
Total Cost
$269,255
Indirect Cost
Name
Upstate Medical University
Department
Ophthalmology
Type
Schools of Medicine
DUNS #
058889106
City
Syracuse
State
NY
Country
United States
Zip Code
13210
Ledford, Kelley L; Martinez-De Luna, Reyna I; Theisen, Matthew A et al. (2017) Distinct cis-acting regions control six6 expression during eye field and optic cup stages of eye formation. Dev Biol 426:418-428
Martinez-De Luna, Reyna I; Ku, Ray Y; Aruck, Alexandria M et al. (2017) Müller glia reactivity follows retinal injury despite the absence of the glial fibrillary acidic protein gene in Xenopus. Dev Biol 426:219-235
Motahari, Zahra; Martinez-De Luna, Reyna I; Viczian, Andrea S et al. (2016) Tbx3 represses bmp4 expression and, with Pax6, is required and sufficient for retina formation. Development 143:3560-3572
Martinez-De Luna, Reyna I; Ku, Ray Yueh; Lyou, Yung et al. (2013) Maturin is a novel protein required for differentiation during primary neurogenesis. Dev Biol 384:26-40
Zuber, Michael E; Nihart, Heather S; Zhuo, Xinming et al. (2012) Site-specific transgenesis in Xenopus. Genesis 50:325-32
Choi, Rene Y; Engbretson, Gustav A; Solessio, Eduardo C et al. (2011) Cone degeneration following rod ablation in a reversible model of retinal degeneration. Invest Ophthalmol Vis Sci 52:364-73
Zuber, Michael E (2010) Eye field specification in Xenopus laevis. Curr Top Dev Biol 93:29-60
Viczian, Andrea S; Zuber, Michael E (2010) Tissue determination using the animal cap transplant (ACT) assay in Xenopus laevis. J Vis Exp :
Viczian, Andrea S; Solessio, Eduardo C; Lyou, Yung et al. (2009) Generation of functional eyes from pluripotent cells. PLoS Biol 7:e1000174