An elusive ciliopathy: Joubert syndrome

Area of Science:

• Neurology
• Genetics
• Rare Diseases

Background:

• Joubert syndrome is a rare genetic disorder characterized by a specific brain malformation.
• It often presents with neurological deficits and can have variable clinical manifestations.

Observation:

• A 65-year-old female presented with recurrent episodes of confusion and disorientation.
• Neurological examination revealed cognitive impairment, oculomotor apraxia, abnormal vestibular ocular reflex, ataxia, and hypotonia.
• Initial investigations including head CT and lumbar puncture ruled out stroke and encephalitis.

Findings:

• Brain MRI revealed the characteristic 'molar tooth sign', indicative of Joubert syndrome.
• Genetic testing confirmed the diagnosis by identifying an anomalous NPHP1 gene.
• The patient exhibited renal function abnormalities.

Implications:

• This case underscores the importance of considering rare genetic disorders like Joubert syndrome in adult patients with unexplained neurological symptoms.
• Early diagnosis through advanced neuroimaging and genetic testing is crucial for appropriate management and genetic counseling.
• Understanding the genetic basis, such as NPHP1 gene mutations, aids in comprehending the syndrome's pathophysiology and potential long-term outcomes.