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A variant of Jansky-Bielschowsky disease
Insights
Jansky-Bielschowsky disease, a rare neurological disorder, presents with varied clinical and neurophysiological features in patients. This study highlights atypical presentations, including later onset and early visual failure, offering new insights into the disease spectrum.
Area of Science:
- Neurology
- Genetics
- Cell Biology
Background:
- Jansky-Bielschowsky disease, a subtype of neuronal ceroid lipofuscinosis, is a rare inherited neurodegenerative disorder.
- Characterized by progressive neurological decline, it typically manifests in early childhood with seizures and visual impairment.
Observation:
- This study presents 18 patients with Jansky-Bielschowsky disease, with 16 exhibiting atypical features compared to classical presentations.
- Clinical variations included later age of onset, early visual failure, and an intermediate disease course.
- Neurophysiological findings showed specific patterns of electroencephalogram (EEG) abnormalities and visual evoked response (VER) extinction.
Findings:
- Accumulation of cytosomes with distinct ultrastructural profiles (curvilinear, fingerprint) was observed in solid tissues.
- Lymphocytes did not show storage material on standard examination or electron microscopy, indicating tissue-specific storage.
- Neurophysiological changes, including EEG spikes and VER abnormalities, appeared at specific age ranges, suggesting disease progression markers.
Implications:
- The findings expand the understanding of the clinical and neurophysiological spectrum of Jansky-Bielschowsky disease.
- Identifying atypical presentations is crucial for accurate diagnosis and management of patients with neuronal ceroid lipofuscinosis.
- Tissue-specific storage patterns may have implications for future diagnostic and therapeutic strategies.
Abstract:
A series of 18 patients with Jansky-Bielschowsky disease is presented. Two children only showed the classical features of the disorder, whereas the remaining 16 differed from the cases previously published in the following respects. Clinically: later onset of age, early onset of visual failure and an intermediate course of the disease. Neurophysiologically: spikes in response to intermittent stimulation appeared by the age of 7-8 years and disappeared after 11 years. The visual evoked response was extinct at an advanced stage of the disorder. Morphologically: accumulation of cytosomes with curvi-linear and fingerprint profiles in solid tissues, but lymphocytes showed no storage material. Electron microscopy of the lymphocytes revealed nothing abnormal.