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Retinal histopathology in eyes from patients with autosomal dominant retinitis pigmentosa caused by rhodopsin mutations

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Abstract

Purpose

To evaluate the histopathology in donor eyes from patients with autosomal dominant retinitis pigmentosa (ADRP) caused by p.P23H, p.P347T and p.P347L rhodopsin ( RHO ) gene mutations.

Methods

Eyes from a 72-year-old male (donor 1), an 83-year-old female (donor 2), an 80-year-old female (donor 3), and three age-similar normal eyes were examined macroscopically, by scanning laser ophthalmoscopy and optical coherence tomography imaging. Perifoveal and peripheral pieces were processed for microscopy and immunocytochemistry with markers for photoreceptor cells.

Results

DNA analysis revealed RHO mutations c.68C>A (p.P23H) in donor 1, c.1040C>T (p.P347L) in donor 2 and c.1039C>A (p.P347T) in donor 3. Histology of the ADRP eyes showed retinas with little evidence of stratified nuclear layers in the periphery and a prominent inner nuclear layer present in the perifoveal region in the p.P23H and p.P347T eyes, while it was severely atrophic in the p.P347L eye. The p.P23H and p.P347T mutations cause a profound loss of rods in both the periphery and perifovea, while the p.P347L mutation displays near complete absence of rods in both regions. All three rhodopsin mutations caused a profound loss of cones in the periphery. The p.P23H and p.P347T mutations led to the presence of highly disorganized cones in the perifovea. However, the p.P347L mutation led to near complete absence of cones also in the perifovea.

Conclusions

Our results support clinical findings indicating that mutations affecting residue P347 develop more severe phenotypes than those affecting P23. Furthermore, our results indicate a more severe phenotype in the p.P347L retina as compared to the p.P347T retina.

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Acknowledgments

The authors thank Dr. Peter MacLeish (Morehouse School of Medicine, Atlanta, GA) for providing us with the antibody to cone arrestin (7G6). Pedigree courtesy of the Berman-Gund Lab (Massachusetts Eye and Ear Infirmary, Boston, MA). This work was supported by The Foundation Fighting Blindness Histopathology Grant F-OH01-1102-0231 (JGH), Research Center Grants from The Foundation Fighting Blindness (JGH), Research to Prevent Blindness Unrestricted Grant and National Institutes of Health grant R01EY014240-08 (JGH) and the Llura and Gordon Gund Foundation.

Conflict of interest statement

The authors declare that they have no financial interest in the subject matter or materials discussed in this manuscript.

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Correspondence to Vera L. Bonilha.

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Bonilha, V.L., Rayborn, M.E., Bell, B.A. et al. Retinal histopathology in eyes from patients with autosomal dominant retinitis pigmentosa caused by rhodopsin mutations. Graefes Arch Clin Exp Ophthalmol 253, 2161–2169 (2015). https://doi.org/10.1007/s00417-015-3099-7

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  • DOI: https://doi.org/10.1007/s00417-015-3099-7

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