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7 Tesla MRI Reveals Brain Structural Abnormalities and Neural Plasticity in RPGR-Related Retinitis Pigmentosa
Katarzyna Nowomiejska1, Katarzyna Baltaziak1, Aleksandra Czarnek-Chudzik1
1Department of General and Pediatric Ophthalmology, Medical University of Lublin, 20-079 Lublin, Poland.
Journal of Clinical Medicine
|March 17, 2025
Summary
High-resolution MRI reveals brain structure changes in retinitis pigmentosa GTPase regulator (RPGR) related retinitis pigmentosa (RP). These findings highlight brain plasticity in response to vision loss, aiding diagnostic and therapeutic strategies.
Area of Science:
- Neuroimaging
- Genetics
- Ophthalmology
Background:
- Retinitis pigmentosa (RP) is an inherited condition causing progressive vision loss.
- RPGR gene mutations are a known cause of RP.
- Understanding brain structural changes in RP is crucial for developing targeted therapies.
Purpose of the Study:
- To quantitatively assess brain structure alterations in patients with RPGR-related RP using 7 Tesla MRI.
- To investigate the relationship between visual loss and brain structural changes in this patient cohort.
Main Methods:
- 12 male patients with RPGR-related RP and 15 healthy controls underwent 7 Tesla MRI brain scans.
- Lateral geniculate nucleus (LGN) volumes were manually measured.
- Other brain structures were analyzed using FreeSurfer software.
Main Results:
- RPGR patients showed significantly reduced mean LGN and left lingual gyrus volumes compared to controls.
- Increased volumes were observed in the left isthmus cingulate and entorhinal cortex in RPGR patients.
- A higher thalamus-to-LGN ratio was noted in the RPGR group.
Conclusions:
- 7 Tesla MRI identified significant structural abnormalities in the visual pathway of RPGR-related RP patients.
- Brain structure reorganization suggests plasticity in response to vision loss.
- Findings may advance diagnostic and therapeutic strategies for RP and precision medicine.
