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Ocular abnormalities in thin basement membrane disease
D Colville1, J Savige, P Branley
1University Department of Medicine, Austin and Repatriation Medical Centre, Victoria, Australia.
The British Journal of Ophthalmology
|May 1, 1997
Summary
Thin basement membrane disease (TBMD) patients do not exhibit the characteristic ocular abnormalities of Alport syndrome, such as dot and fleck retinopathy. This suggests differences in protein distribution or mutation effects between the kidney and eye in TBMD.
Area of Science:
- Ophthalmology
- Nephrology
- Genetics
Background:
- Alport syndrome is an X-linked disorder causing renal failure, deafness, and ocular issues like anterior lenticonus and dot-and-fleck retinopathy.
- Thin basement membrane disease (TBMD) shares ultrastructural similarities in glomerular basement membranes with Alport syndrome and can be inherited.
- The genetic defect and specific protein abnormality in TBMD remain largely unknown.
Purpose of the Study:
- To investigate the presence of ocular abnormalities in individuals diagnosed with thin basement membrane disease (TBMD).
- To compare ocular findings in TBMD patients with those in patients with IgA glomerulonephritis, Alport syndrome, and healthy controls.
Main Methods:
- Ophthalmic examinations were performed on 17 unrelated TBMD patients.
- Methods included slit-lamp biomicroscopy with a 78D lens, direct ophthalmoscopy, and fundal photography.
- Findings were systematically compared against control groups.
Main Results:
- No TBMD patients presented with the characteristic dot-and-fleck retinopathy or anterior lenticonus seen in Alport syndrome.
- Ocular findings such as corneal dystrophy, corneal pigmentation, retinal pigment epithelial clumping, and maculopathy were noted in a small number of TBMD patients.
- Corneal, lens, and retinal dots were observed in TBMD patients, but also frequently in normal individuals and those with other renal diseases, indicating they are not specific to TBMD.
Conclusions:
- The ocular manifestations typical of Alport syndrome are absent in TBMD.
- The ocular findings in TBMD are not specific and do not differentiate it from other renal conditions or normal populations.
- The lack of specific ocular lesions in TBMD suggests the underlying abnormal protein is less critical or distributed differently in ocular basement membranes compared to renal ones, or that mutations affect it less severely.