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Y. Kanan et al.

1.4 Discussion

 

To uncover common genes that will be modulated in different retinal degenerative mouse models, we performed microarray analysis on 3 mouse models of retinal

degeneration. Two of these models are related to rhodopsin, of which one of the models has a deletion of isoleucine at position 255 or 256 (opsin 255–256). The

second rhodopsin model, over expresses opsin by over two folds (Bouse C). The third model expresses the oncogene SV-40 T antigen (MOT1) downstream of opsin promoter. The first phototransduction gene to be severely affected in all the models

is guanine nucleotide binding protein, alpha transducing 1.

In the opsin 255–256 –/– model, we observed up-regulation of 2 proteins involved with cell death, Shugoshin-like 2 tumor necrosis factor-alpha-induced protein B12 and death-associated protein 1 (DAP-1), which causes TNF mediated cell death by the recruitment of FADD death effector (Liou and Liou 1999). The Bouse model of retinal degeneration up-regulates 2 death genes, the tumor necrosis factor receptor superfamily, member 1b and tumor necrosis factor receptor superfamily, member 23 suggesting that in these 2 models of retinal degeneration that are characterized by rhodopsin abnormalities, death is due to the extrinsic TNF pathway.

In the MOT1 model of retinal degeneration, we observed up-regulation of genes involved in DNA binding, DNA replication and ubiquitin mediated degradation. Since MOT1 is a model for cell-cycle dependant cell death, an intracellular event, it is very likely that the intrinsic mitochondrial pathway is activated. In addition, there are several unknown genes not yet annotated in each of the models that could be promising in revealing novel functions in photoreceptors.

In summary, the three models of retinal degeneration show very few similarities regarding modulation of retinal gene expression during degeneration. In conclusion, although the degenerative process appears very similar by histologic examination, the initially activated cell death pathway may be totally different.

References

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Gryczan CW, Kuszak JR, Novak L et al (1995) A transgenic mouse model for autosomal dominant retinitis pigmentosa caused by a three base pair deletion in codon 225/256 of the opsin gene. Invest Ophthalmol Vis Sci 36:S423.

Hartong DT, Berson EL, Dryja TP (2006) Retinitis pigmentosa. Lancet 368:1795–1809 Inglehearn CF, Bashir R, Lester DH et al (1991) A 3-bp deletion in the rhodopsin gene in a family

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1 Analysis of Genes Differentially Expressed During Retinal Degeneration

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