Specific clinical and brain MRI features in mentally retarded patients with mutations in the Oligophrenin-1 gene.
Oligophrenin-1 (OPHN-1) gene disruption is known as responsible for so called "non-specific" X-linked mental retardation (MR) Billuart et al. [1998: Nature 392:923-926]. In order to search for a possible specific clinical and radiological profile for mutation in the OPHN-1 gene, clinical and 3D brain MRI studies were performed in the two families with a known mutation in OPHN-1 reported so far: a 19-year-old female with an X;12 balanced translocation encompassing OPHN-1, and four affected males of family MRX60 sharing a frameshift mutation in OPHN-1. Clinical data shared by affected individuals were neonatal hypotonia with motor delay but no obvious ataxia, marked strabismus, early onset complex partial seizures, and moderate to severe MR. Brain MRIs performed in three individuals exhibited a specific vermian dysgenesis including an incomplete sulcation of anterior and posterior vermis with the most prominent defect in lobules VI and VII. In addition, a non-specific cerebral cortico-subcortical atrophy was also observed. These clinical and radiological features suggest a distinct clinico-radiological syndrome. These preliminary data need to be confirmed in other families and will be helpful for further targeted mutation screening of the OPHN-1 gene in male patients with similar clinico-radiological features. In addition, OPHN-1 inactivation should be considered as a relevant model of developmental vermis disorganization, leading to a better understanding of the possible role of the cerebellum in MR.
des Portes
Vincent
V
Service de Pédiatrie, HCL, Centre Hospitalier Lyon Sud, 69395 Pierre-Bénite, France. vincent.desportes@chu-lyon.fr
Boddaert
Nathalie
N
Sacco
Silvia
S
Briault
Sylvain
S
Maincent
Kim
K
Bahi
Nadia
N
Gomot
Marie
M
Ronce
Nathalie
N
Bursztyn
Joseph
J
Adamsbaum
Catherine
C
Zilbovicius
Monica
M
Chelly
Jamel
J
Moraine
Claude
C
D000328:Adult; D002531:Cerebellum / Q000002:abnormalities* / Q000473:pathology; D003598:Cytoskeletal Proteins / Q000235:genetics*; D004827:Epilepsy / Q000150:complications; D005260:Female; D016368:Frameshift Mutation; D020690:GTPase-Activating Proteins / Q000235:genetics*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D038901:X-Linked Intellectual Disability / Q000150:complications / Q000175:diagnosis* / Q000235:genetics; D009123:Muscle Hypotonia / Q000150:complications; D009154:Mutation; D009687:Nuclear Proteins / Q000235:genetics*; D014786:Vision Disorders / Q000150:complications
D003598:Cytoskeletal Proteins; D020690:GTPase-Activating Proteins; D009687:Nuclear Proteins; C111952:OPHN1 protein, human