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  • Title: Mutations in TMEM231 cause Meckel-Gruber syndrome.
    Author: Shaheen R, Ansari S, Mardawi EA, Alshammari MJ, Alkuraya FS.
    Journal: J Med Genet; 2013 Mar; 50(3):160-2. PubMed ID: 23349226.
    Abstract:
    BACKGROUND: Meckel-Gruber syndrome (MKS) is a genetically heterogeneous severe ciliopathy characterised by early lethality, occipital encephalocele, polydactyly, and polycystic kidney disease. PURPOSE: To report genetic analysis results in two families in which all known MKS diseases genes have been excluded. METHODS: In two consanguineous families with classical MKS in which autozygome-guided sequencing of previously reported MKS genes was negative, we performed exome sequencing followed by autozygome filtration. RESULTS: We identified one novel splicing mutation in TMEM231, which led to complete degradation of the mutant transcript in one family, and a novel missense mutation in the other, both in the homozygous state. CONCLUSIONS: TMEM231 represents a novel MKS locus. The very recent identification of TMEM231 mutations in Joubert syndrome supports the growing appreciation of the overlap in the molecular pathogenesis between these two ciliopathies.
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