Joubert syndrome


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 Inclusion Criteria:

  • A confident clinical diagnosis of Joubert syndrome or Joubert syndrome related disorder based on the presence of the characteristic ‘molar tooth sign’ in axial MRI images confirmed by a neuroradiologist experienced in the diagnosis of Joubert syndrome. With or without other supportive features of Joubert syndrome.

OR

  • Probable ‘molar tooth sign’ in the presence of additional features of Joubert syndrome: polydactyly, renal cysts, retinal dystrophy, oculomotor apraxia or the characteristic breathing abnormality

 Exclusion Criteria:

  • Known genetic cause

Prior genetic testing guidance

  •  Results should have been reviewed for all genetic tests undertaken, including disease-relevant genes in exome sequencing data. The patient is not eligible if they have a molecular diagnosis for their condition.
  • Genetic testing should continue according to routine local practice for this phenotype regardless of recruitment to the project; results of these tests must be submitted via the ‘Genetic investigations’ section of the data capture tool to allow comparison of WGS with current standard testing.

PLEASE NOTE: The sensitivity of WGS compared to current diagnostic genetic testing has not yet been established. It is therefore important that tests which are clinically indicated under local standard practice continue to be carried out.

 Prior genetic testing genes

Testing of the following genes should be carried out PRIOR TO RECRUITMENT where this is in line with current local practice:

  • Joubert syndrome gene panel including AHI1, CC2D2A, CEP290, TMEM67

Closing statement

These requirements will be kept under continual review during the main programme and may be subject to change.

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