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Ultrastructural study of the retina in late infantile metachromatic leukodystrophy
H H Goebel1, H Busch-Hettwer, J Bohl
1Division of Neuropathology, University of Mainz, FRG.
Abstract:
The autopsy of a 2-year-old girl revealed a clinically unrecognized metachromatic leukodystrophy (MLD) due to an aryl-sulfatase A deficiency, characteristically affecting the central and peripheral nervous system by demyelination and by accumulation of metachromatic material. The retina though reported clinically as normal, showed the same demyelinating process in the optic nerve including the papilla but an additional intraneuronal storage of MLD-typical lysosomal residual bodies in ganglion cell perikarya of the retina. Cells of the bipolar and photoreceptor layers as well as pigment epithelial cells were not affected by MLD-specific lysosomal storage. Thus, sulfatides seem to play a particular metabolic role in ganglion cells but not in other neuronal cells of the retina in MLD.
Insights
Metachromatic leukodystrophy (MLD), a genetic disorder, was found in a child
Area of Science:
- Neurology
- Genetics
- Ophthalmology
Background:
- Metachromatic leukodystrophy (MLD) is a rare genetic disorder caused by aryl-sulfatase A deficiency.
- It primarily affects the central and peripheral nervous systems, leading to demyelination and accumulation of metachromatic material.
- Clinical presentation can vary, and ocular manifestations are not always apparent.
Purpose of the Study:
- To investigate the ocular pathology in a case of clinically unrecognized metachromatic leukodystrophy (MLD).
- To determine the specific cellular and molecular changes within the retina in MLD.
- To elucidate the role of sulfatides in retinal ganglion cells.
Main Methods:
- Autopsy examination of a 2-year-old girl with undiagnosed MLD.
- Histopathological analysis of the central and peripheral nervous systems, including the optic nerve and retina.
- Microscopic examination for demyelination and lysosomal storage bodies.
Main Results:
- Autopsy revealed MLD with demyelination in the central and peripheral nervous systems.
- The retina, clinically normal, showed demyelination in the optic nerve and papilla.
- Intraneuronal storage of MLD-typical lysosomal residual bodies was observed in retinal ganglion cell perikarya, but not in other retinal cells.
Conclusions:
- MLD affects the optic nerve and retinal ganglion cells, even when clinically undetected.
- Sulfatides play a specific metabolic role in retinal ganglion cells in the context of MLD.
- These findings highlight the importance of considering ocular pathology in MLD diagnosis and understanding its specific metabolic pathways.