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Familial ataxia with extreme difference in age of clinical onset
Insights
This study describes a rare case of early-onset cerebellar ataxia and retinitis pigmentosa in a father and daughter. It highlights the significant variation in disease progression and symptom severity within the same family.
Area of Science:
- Genetics
- Neurology
- Ophthalmology
Background:
- Cerebellar ataxia and retinitis pigmentosa are neurodegenerative disorders.
- Dominant inheritance patterns are typically associated with later onset and milder symptoms.
Observation:
- A father and daughter presented with cerebellar ataxia and retinitis pigmentosa.
- The daughter exhibited early-onset, rapidly progressive disease with brainstem dysfunction.
- The father had a milder, adult-onset presentation with cerebellar atrophy.
Findings:
- The case demonstrates extreme variability in clinical expression and age of onset for dominantly inherited cerebellar ataxia.
- Abnormal brainstem auditory evoked potentials and posterior fossa atrophy were noted in the child.
- Pneumoencephalography revealed cerebellar atrophy in the father.
Implications:
- This case challenges typical understandings of dominant inheritance patterns in neurodegenerative diseases.
- Further research is needed to understand the genetic factors influencing variable expressivity.
- Early diagnosis and intervention strategies may be crucial for managing severe, early-onset forms.
Abstract:
A female child and her father with cerebellar ataxia and retinitis pigmentosa are described. The father's clinical onset was in middle age, the course of his disease mild and his pneumoencephalogram showed cerebellar atrophy. On the other hand, his daughter's clinical onset was in late infancy, her course was rapidly progressive with manifestations of brainstem dysfunction. She had abnormal brainstem auditory evoked potentials and the computerized tomography scan showed atrophy of the posterior fossa. Recently a paternal aunt developed cerebellar ataxia at the age of fifty. The unusual early age of onset of dominantly inherited cerebellar ataxia and the extreme variation in expression of clinical manifestation are discussed.