Joubert syndrome type 6
Joubert syndrome type 6
An autosomal recessive disorder (OMIM:610688) characterised by cerebellar ataxia, oculomotor apraxia, hypotonia, neonatal breathing abnormalities, psychomotor delay, retinal dystrophy and renal disease.Imaging
Cerebellar vermis hypoplasia/aplasia, thickened and reoriented superior cerebellar peduncles and abnormally large interpeduncular fossa, giving the appearance of a molar tooth on transaxial slices (molar tooth sign).
Molecular pathology
Caused by defects of TMEM67, which encodes meckelin, a key ciliary protein.