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Target intelligence / Profile preview
Cone-rod homeobox protein (CRX)
- Target
- CRX
- Molecular classification
- Transcription factor, Homeodomain protein
01
Overview
Cone-rod homeobox protein (CRX) is a critical K50 homeodomain transcription factor predominantly expressed in retinal photoreceptors—rods and cones. It binds to specific DNA motifs (e.g., TAATC[CA]) upstream of photoreceptor-specific genes to regulate their transcription. CRX is required for the differentiation and lifelong maintenance of photoreceptor neurons. Loss-of-function mutations in CRX cause blinding retinal diseases including retinitis pigmentosa, cone-rod dystrophy, and Leber congenital amaurosis. While its homeodomain structure has been characterized as a globular DNA-binding module, the protein also contains a flexible activation domain. CRX is an essential regulator of retinal development, and its dysfunction leads to failure of photoreceptor maturation or maintenance
- Other names
- Cone-rod homeobox proteinCRXCORD2CRDLCA7OTX3orthodenticle homeobox 3
02
Mechanism of action
No small molecule or biologic therapies with defined mechanism of action for CRX itself; the molecule acts as a transcription factor binding DNA to regulate gene expression
03
Biological functions
Photoreceptor differentiationMaintenance of retinal cell functionTranscriptional regulation of photoreceptor-specific genes
04
Disease associations
Retinitis pigmentosaCone-rod dystrophyLeber congenital amaurosisOther inherited retinal degenerations
05
Safety considerations
Potential off-target effects and challenges of gene therapy specific to retinal cellsRisks of affecting photoreceptor cell development and function if modulated improperly
06
Biomarkers
Mutations in the CRX gene as biomarkers for patient selection or molecular diagnosis of cone-rod dystrophy, retinitis pigmentosa, and Leber congenital amaurosis
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