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Familial pontocerebellar hypoplasia type I with anterior horn cell disease
U Görgen-Pauly1, J Sperner, I Reiss
1Department of Pediatrics, Medical University of Lübeck, Germany.
Insights
This study identifies a rare genetic disorder linking pontocerebellar hypoplasia and anterior horn cell disease in female siblings. Further research is needed to identify the specific gene defect responsible for this condition.
Area of Science:
- Neurology
- Genetics
- Pediatrics
Background:
- Pontocerebellar hypoplasia (PCH) and anterior horn cell (AHC) disease are distinct neurological disorders.
- Barth described PCH type I as a specific subtype with classical features.
Observation:
- Three female siblings presented with overlapping symptoms of PCH and AHC disease.
- Clinical manifestations included polyhydramnios, contractures, respiratory insufficiency, hypotonia, and seizures.
- Neuropathological findings revealed pontocerebellar neuron loss and AHC atrophy, with variations among siblings.
Findings:
- The siblings exhibited a shared genetic defect manifesting as PCH with associated AHC disease.
- The specific gene responsible for this rare disorder remains unidentified.
- The 'survival motor neuron' gene, associated with spinal muscular atrophy, was excluded.
Implications:
- This case series suggests a novel genetic etiology for combined PCH and AHC disease.
- Understanding this genetic link can aid in diagnosing and potentially treating similar rare pediatric neurological disorders.
- Further genetic investigations are crucial to pinpoint the causative gene and elucidate the disease mechanism.
Abstract:
We report the association of pontocerebellar hypoplasia and anterior horn cell disease in three female siblings. One child presented with the classical clinical and neuropathological features of pontocerebellar hypoplasia with associated anterior horn cell disease, described by Barth as pontocerebellar hypoplasia type I. This patient showed polyhydramnios, congenital contractures, respiratory insufficiency, hypotonia, areflexia, listlessness and myoclonic seizures. Postmortem examination revealed a loss of neurons and reactive gliosis in the pontocerebellum and in addition anterior horn cell atrophy resembling Werdnig-Hoffmann disease. Another sibling demonstrated the same clinical symptoms. However neuropathological findings showed evidence for pontocerebellar hypoplasia only. The third sibling was examined after induced fetal abortion because of prenatally diagnosed arthrogryposis. Anterior horn cell disease was obvious histologically whereas pontocerebellar hypoplasia could not be demonstrated due to cerebral autolysis. The similar clinical and neuropathological findings in the three reported siblings suggest a common genetic defect with different patterns of pontocerebellar hypoplasia and associated anterior horn cell disease. The gene defect of this rare disorder is still unknown. The 'survival motor neuron' gene of spinal muscular atrophy was not found in these three siblings.