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Chapter 1

Analysis of Genes Differentially Expressed

During Retinal Degeneration in Three Mouse

Models

Yogita Kanan, Michael Centola, Frank Bart, and Muayyad R. Al-Ubaidi

Abstract An estimated 100,000 people in the US alone have retinitis pigmentosa. This disease, caused by the loss of rods and cones, results in blindness. With the intention of identifying common cell death pathways that result in RP, the pattern

of global gene expression in three different mouse models of retinal degeneration was analyzed using DNA arrays. The models used were opsin 255–256, a trans-

genic mouse line that expresses a mutant form of opsin with a deletion of an isoleucine at either position 255 or 256; the Bouse C mouse, whereby normal opsin is over-expressed by over 2 folds; MOT1, a model that expresses SV-40 T antigen downstream of opsin promoter and leads to retinal degeneration. We found that, at least in the 2 models of retinal degeneration that are characterized by rhodopsin abnormalities, death is due to the TNF pathway. In addition, there are a number of unknown genes not yet annotated in each of the models that could be promising in revealing novel functions in photoreceptors.

1.1 Introduction

Millions worldwide suffer from the blinding disorder retinitis pigmentosa (RP) (Hartong et al. 2006). This condition is characterized by a gradual loss, through cell death, of rods and cones. To understand the cell death process in RP and in the hope of identifying genes that can be targets for therapy, we analyzed differential gene expression during photoreceptor death by performing microarray analysis between age matched C57Bl/6 mice and three mouse models of retinal degeneration. These models are Bouse C, a model where the opsin protein is over-expressed

M.R. Al-Ubaidi (B)

Department of Cell Biology, BMSB 781, 940 Stanton L. Young Blvd., Oklahoma City, OK 73104, USA

e-mail: muayyad-al-ubaidi@ouhsc.edu

R.E. Anderson et al. (eds.), Retinal Degenerative Diseases, Advances in Experimental

3

Medicine and Biology 664, DOI 10.1007/978-1-4419-1399-9_1,

C Springer Science+Business Media, LLC 2010