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Normal cognitive functions in joubert syndrome
A Poretti1, F Dietrich Alber, F Brancati
1Department of Pediatric Neurology, University Children's Hospital of Zurich, Switzerland.
Neuropediatrics
|May 7, 2010
Summary
Joubert syndrome (JS) typically causes developmental delay. However, this case shows a patient with JS and normal intelligence, highlighting the condition's variable presentation.
Area of Science:
- Genetics
- Neuroscience
- Developmental Biology
Background:
- Joubert syndrome (JS) is a rare genetic disorder.
- JS is characterized by developmental delays and cognitive impairments.
- The molar tooth sign on neuroimaging is a hallmark of JS.
Observation:
- A 20-year-old woman presented with mild Joubert syndrome symptoms.
- She exhibited normal intelligence quotients (IQ=93-94).
- Minor visual-spatial and executive function deficits were noted, resembling cerebellar cognitive affective syndrome.
Findings:
- Molecular analysis revealed a homozygous mutation in the INPP5E gene.
- This case demonstrates that normal cognitive function is possible in Joubert syndrome.
- Significant intrafamilial variability in clinical presentation was observed.
Implications:
- This finding expands the understanding of Joubert syndrome's phenotypic spectrum.
- It suggests that INPP5E mutations can lead to a wide range of cognitive outcomes.
- Further research into JS genetics and neurobiology is warranted.
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