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(Investigative Ophthalmology and Visual Science. 2007;48:4759-4765.)
© 2007 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.07-0453
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Inner Retinal Abnormalities in X-linked Retinitis Pigmentosa with RPGR Mutations

Tomas S. Aleman,1 Artur V. Cideciyan,1 Alexander Sumaroka,1 Sharon B. Schwartz,1 Alejandro J. Roman,1 Elizabeth A. M. Windsor,1 Janet D. Steinberg,1 Kari Branham,2 Mohammad Othman,2 Anand Swaroop,2 and Samuel G. Jacobson1

1From the Department of Ophthalmology, Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania; and the 2Department of Ophthalmology and Visual Sciences and Biological Chemistry, University of Michigan Medical School, Ann Arbor, Michigan.

PURPOSE. To investigate in vivo the retinal microstructure in X-linked retinitis pigmentosa (XLRP) caused by RPGR mutations as a prelude to treatment initiatives for this common form of RP.

METHODS. Patients with RPGR-XLRP (n = 12; age range, 10–56 years) were studied by optical coherence tomography (OCT) in a wide region of central retina. Overall retinal thickness and outer nuclear layer (ONL) and inner retinal parameters across horizontal and vertical meridians were analyzed and compared.

RESULTS. Retinal architecture of all patients with RPGR mutations was abnormal. At the fovea in younger patients, the ONL could be normal; but, at increasing eccentricities, there was a loss of photoreceptor laminar structure, even at the youngest ages studied. At later ages and advanced disease stages, the ONL was thin and reduced in extent. Inner retinal thickness, in contrast, was normal or hyperthick. Inner retinal thickening was detectable at all ages studied and was strongly associated with ONL loss.

CONCLUSIONS. Inner retinal laminar abnormalities in RPGR-XLRP are likely to reflect a neuronal–glial retinal remodeling response to photoreceptor loss and are detectable relatively early in the disease course. These results should be factored into emerging therapeutic strategies for this form of RP.




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