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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
PubMed
Summary
This summary is machine-generated.

Joubert syndrome (JS) typically causes developmental delay. However, this case shows a patient with JS and normal intelligence, highlighting the condition's variable presentation.

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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.