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(Investigative Ophthalmology and Visual Science. 2002;43:1384-1388.)
© 2002 by The Association for Research in Vision and Ophthalmology, Inc.

Site-Specific Somatic Mutagenesis in the Retinal Pigment Epithelium

Mikiro Mori, Daniel Metzger, Jean-Marie Garnier, Pierre Chambon and Manuel Mark

From the Institute of Genetics and Molecular and Cellular Biology (IGBMC), Strasbourg, France.

PURPOSE. Generate site-specific somatic mutations selectively in the retinal pigment epithelium (RPE) in mice.

METHODS. A transgenic mouse line expressing the Cre recombinase under the control of the tyrosinase-related protein (TRP)-1 promoter was generated. The presence of Cre was determined by in situ hybridization, and Cre-mediated excision of DNA was analyzed by PCR and alkaline phosphatase (AP) histochemistry in reporter mice carrying a loxP-flanked (floxed) retinoid X receptor {alpha} (RXRa) gene and in Z/AP mice, respectively.

RESULTS. Cre was expressed in the RPE from embryonic day 10.5 to postnatal day 12, resulting in efficient floxed excision of DNA in the RPE from embryonic day 10.5 to adulthood in TRP1-Cre mice. Expressed Cre and excision of DNA were also detected in the ciliary margin of the retina and in some cells in the neural retina, but not in the embryonic periocular mesenchyme or in the choroid.

CONCLUSIONS. The TRP1-Cre mouse line, which induces efficient Cre-mediated excision of DNA selectively in the RPE, provides a new, powerful tool to study gene functions in the RPE in vivo.




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