MEF2C haploinsufficiency caused by either microdeletion of the 5q14.3 region or mutation is responsible for severe mental retardation with stereotypic movements, epilepsy and/or cerebral malformations.

Abstract:

BACKGROUND:Over the last few years, array-comparative genomic hybridisation (CGH) has considerably improved our ability to detect cryptic unbalanced rearrangements in patients with syndromic mental retardation. METHOD:Molecular karyotyping of six patients with syndromic mental retardation was carried out using whole-genome oligonucleotide array-CGH. RESULTS:5q14.3 microdeletions ranging from 216 kb to 8.8 Mb were detected in five unrelated patients with the following phenotypic similarities: severe mental retardation with absent speech, hypotonia and stereotypic movements. Facial dysmorphic features, epilepsy and/or cerebral malformations were also present in most of these patients. The minimal common deleted region of these 5q14 microdeletions encompassed only MEF2C, the gene for a protein known to act in brain as a neurogenesis effector, which regulates excitatory synapse number. In a patient with a similar phenotype, an MEF2C nonsense mutation was subsequently identified. CONCLUSION:Taken together, these results strongly suggest that haploinsufficiency of MEF2C is responsible for severe mental retardation with stereotypic movements, seizures and/or cerebral malformations.

journal_name

J Med Genet

authors

Le Meur N,Holder-Espinasse M,Jaillard S,Goldenberg A,Joriot S,Amati-Bonneau P,Guichet A,Barth M,Charollais A,Journel H,Auvin S,Boucher C,Kerckaert JP,David V,Manouvrier-Hanu S,Saugier-Veber P,Frébourg T,Dubourg C,Andr

doi

10.1136/jmg.2009.069732

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

22-9

issue

1

eissn

0022-2593

issn

1468-6244

pii

jmg.2009.069732

journal_volume

47

pub_type

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